Liquid jet head, support body and liquid jet device

Abstract

To improve the attachment / detachment property while securing required positioning accuracy of a liquid jet head to a support body.SOLUTION: A liquid jet head includes a first positioning part into which a first positioning pin of a support body is inserted. When a virtual column which is inserted to the deepest position of the first positioning part and whose cross-sectional area becomes maximum when viewed from a first direction being the depth direction of the first positioning part is the first virtual column, the side surface of the first virtual column includes a first region, a second region and a third region therebetween as the three regions divided in the first direction; the first region contacts the first positioning part on a first side being one side in a second direction orthogonal to the first direction with respect to a first center line of the first virtual column but does not contact the first positioning part on a second side being the other side in the second direction; the second region does not contact the first positioning part on the first side with respect to the first center line but contacts the first positioning part on the second side; and the third region does not contact the first positioning part on both of the first side and the second side with respect to the first center line.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to a liquid ejection head, a support, and a liquid ejection apparatus. [Background technology]

[0002] 2. Description of the Related Art Conventionally, liquid ejecting apparatuses, such as inkjet printers, generally include a liquid ejecting head that ejects liquid such as ink in the form of droplets.

[0003] For example, Patent Document 1 discloses that a head (liquid ejection head) has a positioning pin member (positioning pin), and an array base member (support) has a positioning hole (positioning portion), and the head is positioned relative to the array base member by inserting the positioning pin member into the positioning hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-23378 Summary of the Invention [Problem to be solved by the invention]

[0005] In a configuration in which the liquid jet head is positioned relative to the support by inserting a positioning pin into a positioning portion as in Patent Document 1, it is desirable to make it possible to easily attach and detach the liquid jet head to and from the support. [Means for solving the problem]

[0006] In order to solve the above problems, a liquid jet head according to a preferred aspect of the present disclosure is a liquid jet head that is supported by a support having a first positioning pin and that jets liquid, and that includes a first positioning portion that positions the liquid jet head with respect to the support by inserting the first positioning pin, and when an imaginary cylinder that is inserted to the deepest position of the first positioning portion and has a maximum cross-sectional area when viewed in a first direction that is a depth direction of the first positioning portion is defined as a first imaginary cylinder, a side surface of the first imaginary cylinder is divided in the first direction into three regions, namely, a first region, a second region, and a third region. and a third region disposed between the first region and the second region, wherein the first region contacts the first positioning portion on a first side that is one side of a second direction perpendicular to the first direction with respect to a first center line that is the center line of the first virtual cylinder, and does not contact the first positioning portion on a second side that is the other side of the second direction, the second region does not contact the first positioning portion on the first side with respect to the first center line, and contacts the first positioning portion on the second side, and the third region does not contact the first positioning portion on both the first side and the second side with respect to the first center line.

[0007] A support according to a preferred aspect of the present disclosure is a support for supporting a liquid jet head that jets liquid, and includes a first positioning portion into which a first positioning pin provided on the liquid jet head is inserted to position the liquid jet head with respect to the support, and when a virtual cylinder that is inserted to the deepest position of the first positioning portion and has a maximum cross-sectional area as viewed in a first direction that is a depth direction of the first positioning portion is defined as a first virtual cylinder, a side surface of the first virtual cylinder is divided in the first direction into three regions, namely a first region, a second region, and the first virtual cylinder. and a third region disposed between the first region and the second region, wherein the first region contacts the first positioning portion on a first side that is one side of a second direction perpendicular to the first direction with respect to a first center line that is the center line of the first virtual cylinder, and does not contact the first positioning portion on a second side that is the other side of the second direction, the second region does not contact the first positioning portion on the first side with respect to the first center line, and contacts the first positioning portion on the second side, and the third region does not contact the first positioning portion on both the first side and the second side with respect to the first center line.

[0008] A liquid ejecting apparatus according to a preferred aspect of the present disclosure includes the liquid ejecting head according to the above-described aspect, and a support body including the first positioning pin.

[0009] A liquid ejecting apparatus according to another preferred aspect of the present disclosure includes the support body according to the above-described aspect, and a liquid ejecting head including the first positioning pin. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating an example of the configuration of a liquid ejecting apparatus according to a first embodiment. [Figure 2] FIG. 1 is a perspective view of a head module having a liquid jet head according to a first embodiment. [Figure 3] FIG. 1 is an exploded perspective view of a liquid jet head according to a first embodiment. [Figure 4] FIG. 1 is a plan view of a liquid jet head according to a first embodiment. [Figure 5]FIG. 2 is a perspective view of a support according to the first embodiment. [Figure 6] FIG. 1 is a plan view of a liquid jet head according to a first embodiment. [Figure 7] 7 is a view of a first positioning part of the liquid jet head shown in FIG. 6, viewed in the Z2 direction. [Figure 8] FIG. 8 is a cross-sectional view taken along line AA in FIG. [Figure 9] 8 is a view of the first positioning part shown in FIG. 7 as viewed in the Z1 direction. [Figure 10] 8 is a plan view for explaining a first imaginary cylinder set in the first positioning portion shown in FIG. 7. FIG. [Figure 11] 8 is a cross-sectional view for explaining a first imaginary cylinder set in the first positioning portion shown in FIG. 7. FIG. [Figure 12] 8 is a diagram showing a state in which a first positioning pin of a support body is inserted into a first positioning portion shown in FIG. 7. FIG. [Figure 13] 8 is a diagram showing a state in which the first positioning part shown in FIG. 7 is inclined with respect to the first positioning pin of the support body. FIG. [Figure 14] 3A to 3C are schematic views for explaining attachment and detachment of the liquid jet head to and from the support body according to the first embodiment. [Figure 15] 7 is a view of a second positioning portion of the liquid jet head shown in FIG. 6, viewed in the Z2 direction. [Figure 16] FIG. 16 is a cross-sectional view taken along line BB in FIG. [Figure 17] 16 is a view of the second positioning part shown in FIG. 15 as viewed in the Z1 direction. FIG. [Figure 18] 16 is a plan view for explaining a second imaginary cylinder set in the second positioning portion shown in FIG. 15. FIG. [Figure 19] 16 is a cross-sectional view for explaining a second imaginary cylinder set in the second positioning portion shown in FIG. 15. FIG. [Figure 20] 16 is a diagram showing a state in which a second positioning pin of a support body is inserted into the second positioning portion shown in FIG. 15. FIG. [Figure 21] 10 is a view showing a first positioning part of a liquid jet head according to a second embodiment, as viewed in the Z2 direction. FIG. [Figure 22]22 is a cross-sectional view taken along the line EE in FIG. 21. [Figure 23] 22 is a view of the first positioning part shown in FIG. 21 as viewed in the Z1 direction. FIG. [Figure 24] 10 is a view showing a first positioning part of a liquid jet head according to a third embodiment, as viewed in the Z2 direction. FIG. [Figure 25] 25 is a cross-sectional view taken along the line FF in FIG. 24. [Figure 26] 25 is a view of the first positioning part shown in FIG. 24 as viewed in the Z1 direction. FIG. [Figure 27] 10 is a view showing a first positioning part of a liquid jet head according to a fourth embodiment, as viewed in the Z2 direction. FIG. [Figure 28] 28 is a cross-sectional view taken along line GG in FIG. 27. [Figure 29] 28 is a cross-sectional view taken along line GG in FIG. 27. [Figure 30] 10 is a view showing a second positioning part of the liquid jet head according to the fourth embodiment, as viewed in the Z2 direction. FIG. [Figure 31] 31 is a cross-sectional view taken along line HH in FIG. 30. [Figure 32] 31 is a cross-sectional view taken along line HH in FIG. 30. [Figure 33] 10 is a cross-sectional view illustrating a state in which a first positioning pin is inserted into a first positioning portion of a liquid jet head according to a fifth embodiment. FIG. [Figure 34] 13 is a cross-sectional view illustrating a state in which a first positioning pin is inserted into a first positioning portion of a liquid jet head according to a sixth embodiment. FIG. [Figure 35] 10 is a view showing a first positioning part of a liquid jet head according to a first modification example, viewed in the Z2 direction. FIG. [Figure 36] 36 is a cross-sectional view taken along line JJ in FIG. 35. [Figure 37] 36 is a view of the first positioning part shown in FIG. 35 as viewed in the Z1 direction. FIG. [Figure 38] FIG. 10 is a plan view of a liquid jet head according to a second modification. [Figure 39] 10 is a view showing a first positioning part of a liquid jet head according to a second modification, as viewed in the Z2 direction. FIG. [Figure 40] 39 along the line KK. FIG. [Figure 41]10 is a view showing a second positioning part of a liquid jet head according to a second modification, as viewed in the Z2 direction. FIG. [Figure 42] 42 is a cross-sectional view taken along line LL in FIG. 41. [Figure 43] FIG. 11 is a plan view of a liquid jet head according to a third modification. [Figure 44] 10A and 10B are schematic views for explaining attachment and detachment of a liquid jet head according to a fourth modification to a support body. [Figure 45] 13 is a cross-sectional view of a first positioning portion according to Modification 4. FIG. [Figure 46] 13 is a cross-sectional view of a second positioning portion according to Modification 4. FIG. [Figure 47] 13A and 13B are schematic views for explaining attachment and detachment of a liquid jet head according to a fifth modification to a support body. [Figure 48] 13 is a cross-sectional view of a first positioning portion according to Modification 5. FIG. [Figure 49] 13 is a cross-sectional view of a second positioning portion according to Modification 5. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings. Note that the dimensions and scale of each part in the drawings may differ from the actual dimensions and are shown schematically to facilitate understanding. Furthermore, the scope of the present disclosure is not limited to these embodiments unless otherwise specified in the following description to the effect that the present disclosure is limited.

[0012] For convenience, the following description will use the mutually intersecting X-axis, Y-axis, and Z-axis as appropriate. Also, hereinafter, one direction along the X-axis is the X1 direction, and the direction opposite the X1 direction is the X2 direction. Similarly, the opposite directions along the Y-axis are the Y1 direction and the Y2 direction. Also, the opposite directions along the Z-axis are the Z1 direction and the Z2 direction.

[0013] Here, the Z1 direction or the Z2 direction is an example of a "first direction." The Y1 direction or the Y2 direction is an example of a "second direction." The Y2 direction is an example of a "first side that is one side of the second direction," and the Y1 direction is an example of a "second side that is the other side of the second direction." The X1 direction or the X2 direction is an example of a "third direction." Note that, hereinafter, viewing in a direction along the Z axis may be referred to as a "planar view."

[0014] 1. First embodiment 1-1. Schematic configuration of the liquid ejection device 1 is a schematic diagram showing an example of the configuration of a liquid ejection apparatus 100 according to a first embodiment. The liquid ejection apparatus 100 is an inkjet printing apparatus that ejects ink, an example of a liquid, as droplets onto a medium M. The medium M is typically printing paper. However, the medium M is not limited to printing paper, and may be a printing target made of any material, such as a resin film or fabric.

[0015] The X-axis, Y-axis, and Z-axis in the first embodiment are coordinate axes of a local coordinate system based on a liquid jet head 1 (described later) arranged in three dimensions. Therefore, Figures 1 to 5, 12 to 14, and 20 show the coordinate axes of the local coordinate system based on the liquid jet head 1 in a state where the liquid jet head 1 is supported by a support body 51 (described later). Therefore, in the following description of the first embodiment, configurations other than the liquid jet head 1 may be described using a local coordinate system based on the liquid jet head 1 in a state where the liquid jet head 1 is supported by the support body 51.

[0016] 1, the liquid ejecting device 100 has a liquid container 10, a control unit 20, a transport mechanism 30, a movement mechanism 40, a head module 50, and a circulation mechanism 60. These will be briefly described below in order based on FIG.

[0017] The liquid container 10 stores ink. Specific examples of the liquid container 10 include a cartridge that is detachable from the liquid ejection device 100, a bag-shaped ink pack made of a flexible film, and an ink tank that can be refilled with ink.

[0018] Although not shown, the liquid container 10 of this embodiment has multiple containers for storing different types of ink. The inks stored in the multiple containers are not particularly limited, but examples include water-based inks in which a coloring material such as a dye or pigment is dissolved in a water-based solvent, solvent-based inks in which a coloring material is dissolved in an organic solvent, and ultraviolet-curable inks.

[0019] The control unit 20 includes, for example, a processing circuit such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array) and a storage circuit such as a semiconductor memory, and controls the operation of each element of the liquid ejection device 100. The control unit 20 controls the ink ejection operation by the head module 50.

[0020] The transport mechanism 30 transports the medium M in a transport direction DM, which is the Y1 direction, under the control of the control unit 20. The movement mechanism 40 reciprocates the head module 50 in the X1 and X2 directions under the control of the control unit 20. In the example shown in FIG. 1, the movement mechanism 40 has a substantially box-shaped transport body 41 called a carriage that houses the head module 50, and a transport belt 42 to which the transport body 41 is fixed. Note that in addition to the head module 50, the transport body 41 may also be equipped with the aforementioned liquid container 10.

[0021] Under the control of the control unit 20, the head module 50 ejects ink supplied from the liquid container 10 via the circulation mechanism 60 from each of the multiple nozzles onto the medium M in the Z2 direction. This ejection is performed in parallel with the transport of the medium M by the transport mechanism 30 and the reciprocating movement of the head module 50 by the movement mechanism 40, thereby forming an ink image on the surface of the medium M. The head module 50 has multiple liquid ejection heads 1. Details of the liquid ejection heads 1 will be described later with reference to FIGS. 2 to 20.

[0022] 1, the liquid container 10 is connected to the head module 50 via a circulation mechanism 60. The circulation mechanism 60 is a mechanism that supplies ink to the head module 50 and collects ink discharged from the head module 50 so that it can be resupplied to the head module 50.

[0023] 1-2. Liquid jet head Fig. 2 is a perspective view of a head module 50 having a liquid jet head 1 according to the first embodiment. As shown in Fig. 2, the head module 50 has a support body 51 and a plurality of liquid jet heads 1. The liquid jet heads 1 are elongated in the direction along the Y axis.

[0024] The support 51 is a plate-like member that supports a plurality of liquid jet heads 1. The support 51 is provided with a plurality of openings 51a, a plurality of positioning pins 51b, and a plurality of screw holes 51c. The support 51 is fixed to the conveying body 41 by a fixing means (not shown). The support 51 itself may be the conveying body 41. The shape of the support 51 does not have to be plate-like, and may be, for example, a box-like shape with a recess that can accommodate a plurality of liquid jet heads 1.

[0025] The openings 51a are holes for inserting the liquid jet heads 1 with the ejection surfaces FN facing the Z2 direction, and penetrate the support body 51 in the thickness direction. In the example shown in Fig. 2, each opening 51a extends in the direction along the Y axis, and two liquid jet heads 1 are inserted into one opening 51a.

[0026] The positioning pin 51b is a rod-shaped protrusion that is disposed near the periphery of the opening 51a and protrudes from a protruding surface FP, which is the surface of the support body 51 facing the Z1 direction. In this embodiment, the positioning pin 51b has a circular shape in a plan view, specifically a perfect circle. The positioning pin 51b is inserted by press-fitting into a positioning portion 13e provided in the liquid jet head 1, which will be described later. The shape of the positioning portion 13e may be a through-hole or a blind hole, but in this embodiment, it is a through-hole. The press-fitting is a so-called interference fit or transition fit, which will be described in detail later. In the example shown in FIG. 2, two positioning pins 51b are provided for one liquid jet head 1. Details of the positioning pins 51b will be described later with reference to FIG. 5.

[0027] The screw holes 51c are arranged near the periphery of the opening 51a and are female threads provided on a surface of the support body 51 facing the Z1 direction. A screw (not shown) is fitted into the screw hole 51c. The screw is inserted into a hole 13f of the liquid jet head 1 (described later) and fixes the liquid jet head 1 to the support body 51. In the example shown in FIG. 2, two screw holes 51c are provided for one liquid jet head 1.

[0028] As described above, the plurality of liquid jet heads 1 are attached to the support body 51. In the example shown in Fig. 2, the plurality of liquid jet heads 1 are arranged in a matrix along the X-axis and Y-axis.

[0029] The number and arrangement of the liquid jet heads 1 included in the head module 50 are not limited to the example shown in Fig. 2 and are arbitrary. The shape of the support body 51 is also not limited to the example shown in Fig. 2 and is arbitrary. The opening 51a may be provided for one liquid jet head 1 or for three or more liquid jet heads 1.

[0030] Fig. 3 is an exploded perspective view of the liquid jet head 1 according to the first embodiment. As shown in Fig. 3, the liquid jet head 1 includes a flow path structure 11, a wiring board 12, a holder 13, four head chips HC, a fixing plate 14, a reinforcing plate 15, a cover 16, and a sealing member 17. These are arranged in the Z2 direction in the following order: cover 16, wiring board 12, flow path structure 11, sealing member 17, holder 13, four head chips HC, reinforcing plate 15, and fixing plate 14. The holder 13 is an example of a "first member." Each part of the liquid jet head 1 will be described below in order.

[0031] The flow path structure 11 is a structure in which flow paths are provided inside for supplying ink from the circulation mechanism 60 to four head chips HC. The flow path structure 11 has a flow path member 11a and four connecting pipes 11b to 11e. Although not shown in FIG. 3, the flow path member 11a is provided with two supply flow paths for supplying ink to the four head chips HC and two discharge flow paths for discharging ink from the four head chips HC. The flow path member 11a has multiple substrates Su1 to Su5, which are stacked in this order in the Z2 direction and joined to each other, for example, with an adhesive. Each of the connecting pipes 11b to 11e is a pipe body protruding from the surface of the flow path member 11a facing the Z1 direction. Each of the connecting pipes 11b and 11c is connected to one of the two supply flow paths mentioned above, and each of the connecting pipes 11d and 11e is connected to one of the two discharge flow paths mentioned above. Furthermore, the flow path member 11a is provided with a plurality of holes 11f. A screw SC is inserted into each hole 11f. The screws SC fix the flow path member 11a to the holder 13.

[0032] The wiring board 12 is a mounting component for electrically connecting the liquid jet head 1 to the control unit 20, and is disposed on the flow path structure 11. A connector 12a is disposed on the surface of the wiring board 12 facing the Z1 direction. The connector 12a is a connecting component for electrically connecting the liquid jet head 1 and the control unit 20. Although not shown, wiring that is connected to the four head chips HC is also connected to the wiring board 12.

[0033] Holder 13 is a structure that houses and supports four head chips HC. Holder 13 is provided with a plurality of holder flow paths 13a, a plurality of wiring holes 13b, a plurality of recesses 13c, a plurality of screw holes 13d, a plurality of holes 13f, and a plurality of positioning portions 13e.

[0034] The holder 13 is made of, for example, a resin material or a metal material. In this embodiment, the positioning pin 51b is press-fit into the positioning portion 13e, and therefore the holder 13 and the positioning pin 51b are each made of a metal material. Examples of metal materials include iron, titanium, aluminum, magnesium, and alloys containing at least one of these metal elements. Examples of alloys include stainless steel, 42 alloy, and invar. In this embodiment, the holder 13 and the positioning pin 51b are made of the same metal material, specifically stainless steel. The positioning pin 51b and the support body 51 may be integrally formed, or the positioning pin 51b and the support body 51 may be separate and integrally formed by joining or the like.

[0035] Each of the holder channels 13a is a hole for allowing ink to flow between the head chip HC and the channel structure 11. The holder channels 13a are provided corresponding to the inlet ports R_in and outlet ports R_out, which will be described later. Each of the wiring holes 13b is a hole through which a wire (not shown) that connects the head chip HC and the wiring substrate 12 is passed. Each of the recesses 13c is open in the Z2 direction and is a space in which the head chip HC is disposed. Each of the screw holes 13d is a female thread that fits with a screw SC. The channel member 11a is pressed against the holder 13 by fastening the screw SC inserted into the hole 11f of the channel member 11a to the screw hole 13d. A screw (not shown) for fixing the liquid jet head 1 to the support body 51 described above is inserted into each of the holes 13f. The positioning pin 51b of the support body 51 described above is inserted into each of the positioning portions 13e. The positioning portions 13e will be described in detail later with reference to FIGS.

[0036] Each head chip HC ejects ink. Each head chip HC is provided with an inlet R_in for introducing ink and an outlet R_out for discharging ink. The inlet R_in and outlet R_out are respectively joined to the head chip HC and the holder 13 with an adhesive, and are thereby liquid-tightly connected to the corresponding holder flow path 13a.

[0037] FIG. 4 is a plan view of the liquid jet head 1 according to the first embodiment, as viewed in the Z1 direction. As shown in FIG. 4, each head chip HC has a nozzle-forming surface FN_A on which multiple nozzles N are formed. The nozzle-forming surface FN_A is a surface of the nozzle plate on which multiple nozzles N are formed, facing the Z2 direction. The multiple nozzles N are aligned along the Y axis to form a nozzle row. Although not shown, each head chip HC has, for each nozzle N, a piezoelectric element serving as a drive element and a pressure chamber for containing ink supplied from an inlet R_in. The piezoelectric element ejects ink from the nozzle corresponding to the pressure chamber by changing the pressure of the ink in the pressure chamber corresponding to the piezoelectric element. Such a head chip HC can be obtained, for example, by bonding multiple substrates, such as silicon substrates, that have been appropriately processed by etching or the like, together with an adhesive or the like. Note that, instead of the piezoelectric element, a heater for heating the ink in the pressure chamber may be used as the drive element for ejecting ink from the nozzle N.

[0038] The fixing plate 14 is a plate member for fixing the four head chips HC to the holder 13. Specifically, the fixing plate 14 is arranged so that the four head chips HC are sandwiched between the fixing plate 14 and the holder 13, and is fixed to the holder 13 with an adhesive. The fixing plate 14 is made of, for example, a metal material. The fixing plate 14 is provided with a plurality of openings 14a for exposing the plurality of nozzles N of each of the four head chips HC. Here, the surface FN_B of the fixing plate 14 facing the Z2 direction and the four nozzle forming surface FN_A constitute the ejection surface FN of the liquid ejection head 1 facing the Z2 direction. In other words, the ejection surface FN is a surface having a plurality of nozzles N. The plurality of openings 14a are provided individually for each head chip HC.

[0039] The reinforcing plate 15 is a plate-like member that is disposed between the holder 13 and the fixed plate 14 and reinforces the fixed plate 14. The reinforcing plate 15 is disposed on top of the fixed plate 14 and fixed to the fixed plate 14 with an adhesive. The reinforcing plate 15 is provided with a plurality of openings 15a in which four head chips HC are disposed. The reinforcing plate 15 is made of, for example, a metal material.

[0040] The cover 16 is a box-shaped member that houses the flow path member 11a and the wiring board 12 of the flow path structure 11, and is made of, for example, a resin material. The cover 16 is provided with four through holes 16a and an opening 16b. Any of the connection pipes 11b to 11e is inserted into the four through holes 16a. A connector 12a is passed from inside the cover 16 to the outside through the opening 16b.

[0041] The sealing member 17 is an elastic member for liquid-tightly connecting the flow paths of the flow path structure 11 and the holder flow paths 13a of the holder 13. In the example shown in FIG. 3, the sealing member 17 is sheet-shaped and is provided with a plurality of ink holes 17a, a plurality of wiring holes 17b, and a plurality of holes 17c. The plurality of ink holes 17a are holes for allowing ink to flow between the flow path structure 11 and the holder 13, and are provided corresponding to the inlet port R_in and the outlet port R_out. Each of the plurality of wiring holes 17b is a hole through which a wiring (not shown) that connects the head chip HC and the wiring substrate 12 is passed. Each of the plurality of holes 17c is a hole for inserting a screw SC.

[0042] 1-3. Positioning of the liquid ejection head relative to the support Fig. 5 is a perspective view of the support body 51 according to the first embodiment. As shown in Fig. 5, the support body 51 is provided with a plurality of first positioning pins 51b_1, a plurality of second positioning pins 51b_2, a plurality of screw holes 51c_1, and a plurality of screw holes 51c_2 near the outer edges of each of the plurality of openings 51a.

[0043] The first positioning pin 51b_1 and the second positioning pin 51b_2 are the positioning pins 51b shown in Fig. 2. The first positioning pin 51b_1 is inserted into a first positioning portion 13e_1 (described later) of the liquid jet head 1. On the other hand, the second positioning pin 51b_2 is inserted into a second positioning portion 13e_2 (described later) of the liquid jet head 1.

[0044] 5, one first positioning pin 51b_1 and one second positioning pin 51b_2 are provided for each liquid jet head 1. The first positioning pin 51b_1 and the second positioning pin 51b_2 corresponding to one liquid jet head 1 are aligned in the direction along the Y axis. More specifically, the first positioning pin 51b_1 is disposed in the Y2 direction relative to the second positioning pin 51b_2.

[0045] The screw hole 51c_1 and the screw hole 51c_2 are each the screw hole 51c shown in Fig. 2. A screw corresponding to a hole 13f_1 (described later) of the liquid jet head 1 is fitted into the screw hole 51c_1. On the other hand, a screw corresponding to a hole 13f_2 (described later) of the liquid jet head 1 is fitted into the screw hole 51c_2.

[0046] 5, one screw hole 51c_1 and one screw hole 51c_2 are provided for each liquid jet head 1. The screw holes 51c_1 and 51c_2 corresponding to each liquid jet head 1 are aligned in the direction along the Y axis. More specifically, the screw hole 51c_1 is disposed in the Y2 direction relative to the screw hole 51c_2. Here, among the positioning pins 51b and the screw holes 51c corresponding to each liquid jet head 1, the first positioning pin 51b_1 is positioned closer to the screw hole 51c_1 than the screw hole 51c_2, and the second positioning pin 51b_2 is positioned closer to the screw hole 51c_2 than the screw hole 51c_1.

[0047] FIG. 6 is a plan view of the liquid jet head 1 according to the first embodiment, as viewed in the Z2 direction. As shown in FIG. 6, in the liquid jet head 1, the holder 13 has a flange portion 13h that protrudes from the cover 16 when viewed in the Z2 direction. As shown in FIG. 4, the flange portion 13h in a plan view when viewed in the Z1 direction protrudes outward from the entire periphery of the side surface of the holder 13. A second surface F2, which is the surface of the flange portion 13h facing the Z2 direction, comes into contact with the protruding surface FP, which is the surface of the support body 51 facing the Z1 direction. A first positioning portion 13e_1, a second positioning portion 13e_2, a hole 13f_1, and a hole 13f_2 are provided on the flange portion 13h.

[0048] The first positioning portion 13e_1 and the second positioning portion 13e_2 are the positioning portion 13e shown in Fig. 2. The first positioning pin 51b_1 of the support body 51 is inserted into the first positioning portion 13e_1. On the other hand, the second positioning pin 51b_2 of the support body 51 is inserted into the second positioning portion 13e_2.

[0049] 6, one first positioning portion 13e_1 and one second positioning portion 13e_2 are provided for each liquid jet head 1. The first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned in the direction along the Y axis. More specifically, the first positioning portion 13e_1 is disposed in the Y2 direction relative to the second positioning portion 13e_2. In addition, at least a portion of the ejection surface FN is interposed between the first positioning portion 13e_1 and the second positioning portion 13e_2 in a plan view seen in the Z1 direction.

[0050] The holes 13f_1 and 13f_2 are the holes 13f shown in Fig. 2. A screw to be fitted into the screw hole 51c_1 of the support body 51 is inserted into the hole 13f_1. On the other hand, a screw to be fitted into the screw hole 51c_2 of the support body 51 is inserted into the hole 13f_2.

[0051] In the example shown in FIG. 6, one hole 13f_1 and one hole 13f_2 are provided for each liquid jet head 1. The holes 13f_1 and 13f_2 are aligned in the direction along the Y axis. More specifically, the hole 13f_1 is disposed in the Y2 direction relative to the hole 13f_2. The first positioning portion 13e_1 is located closer to the hole 13f_1 than the hole 13f_2. The second positioning portion 13e_2 is located closer to the hole 13f_2 than the hole 13f_1.

[0052] FIG. 7 is a view of the first positioning portion 13e_1 of the liquid jet head 1 shown in FIG. 6 as viewed in the Z2 direction. FIG. 8 is a cross-sectional view taken along line AA in FIG. 7. FIG. 9 is a view of the first positioning portion 13e_1 shown in FIG. 7 as viewed in the Z1 direction. As shown in FIGS. 7 to 9, the first positioning portion 13e_1 has a first through hole 2, a first recess 3, and a second recess 4. The first through hole 2 is disposed between the first recess 3 and the second recess 4 in the direction along the Y axis. More specifically, the first recess 3, the first through hole 2, and the second recess 4 are aligned in this order in the Y2 direction.

[0053] The first through hole 2 is a hole that penetrates the flange portion 13h of the holder 13. Here, the flange portion 13h has a first surface F1 that faces the Z1 direction and a second surface F2 that faces the Z2 direction, and the first through hole 2 penetrates in a direction along the Z axis from the first surface F1 to the second surface F2. In this embodiment, as shown in FIGS. 7 and 9, the first through hole 2 has a circular shape in a plan view. Note that the shape of the first through hole 2 in a plan view is not limited to the examples shown in FIGS. 7 and 9.

[0054] The first recess 3 is provided on the first surface F1 and adjacent to a portion of the first through hole 2 on the Y1 direction side in plan view. On the other hand, the second recess 4 is provided on the second surface F2 and adjacent to a portion of the first through hole 2 on the Y2 direction side in plan view.

[0055] Here, the sum of the depths of the first recess 3 and the second recess 4 is greater than the distance between the first surface F1 and the second surface F2 (i.e., the thickness of the flange portion 13h of the holder 13). In other words, the sum of the length of the first contact portion CT1 (described below) in the direction along the Z axis and the length of the second contact portion CT2 (described below) in the direction along the Z axis is less than the distance between the first surface F1 and the second surface F2 (i.e., the thickness of the flange portion 13h of the holder 13). Note that the shape of the first recess 3 in a plan view is not limited to the example shown in FIG. 7 and is arbitrary. Furthermore, the shape of the second recess 4 in a plan view is not limited to the example shown in FIG. 9 and is arbitrary.

[0056] FIG. 10 is a plan view illustrating the first imaginary cylinder VC1 set in the first positioning portion 13e_1 shown in FIG. 7. FIG. 11 is a cross-sectional view illustrating the first imaginary cylinder VC1 set in the first positioning portion 13e_1 shown in FIG. 7. The first imaginary cylinder VC1 is an imaginary cylinder that is inserted to the deepest position in the first positioning portion 13e_1 and has the largest cross-sectional area when viewed in the depth direction (direction along the Z axis) of the first positioning portion 13e_1. The first imaginary cylinder VC1 is not an oblique cylinder but a right circular cylinder. In the example shown in FIG. 10, the shape of the first imaginary cylinder VC1 in a plan view is a perfect circle. In other words, the bottom surface of the first imaginary cylinder VC1 is a perfect circle. Note that the shape of the first imaginary cylinder VC1 in a plan view is defined based on the shape of the first positioning portion 13e_1 in a plan view, and therefore may be an ellipse. In such a case, the first imaginary cylinder VC1 is an elliptical cylinder.

[0057] 11, the side surface of the first imaginary cylinder VC1 is divided into three regions along the Z axis: a first region RE1, a second region RE2, and a third region RE3 disposed between the first region RE1 and the second region RE2. In this embodiment, the second region RE2 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the first region RE1, with respect to the direction along the Z axis.

[0058] The first region RE1 is a region that contacts the first positioning portion 13e_1 on the Y2 side with respect to a first center line LC1, which is the center line of the first imaginary cylinder VC1, but does not contact the first positioning portion 13e_1 on the Y1 side. The second region RE2 is a region that does not contact the first positioning portion 13e_1 on the Y2 side with respect to the first center line LC1, but contacts the first positioning portion 13e_1 on the Y1 side. The third region RE3 is a region that does not contact the first positioning portion 13e_1 on either the Y2 side or the Y1 side with respect to the first center line LC1. The first center line LC1 is a straight line that passes through the center of the bottom surface of the first imaginary cylinder VC1 and extends in the direction along the Z axis.

[0059] Here, the first recess 3 is adjacent to a portion of the first region RE1 on the Y1 direction side with respect to the first center line LC1. The second recess 4 is adjacent to a portion of the second region RE2 on the Y2 direction side with respect to the first center line LC1. The first recess 3 and the second recess 4 are each adjacent to the third region RE3. The first imaginary cylinder VC1 extends from the first surface F1 to the second surface F2 along the first through hole 2. The first imaginary cylinder VC1 of this embodiment extends from one end to the other end of the first through hole 2 in the direction along the Z axis, and corresponds to the shape of the first through hole 2. In other words, the deepest position of the first positioning portion 13e_1 is the Z1-direction end of the first through hole 2 (i.e., the position of the first surface F1 on the Z axis) when the first imaginary cylinder VC1 is inserted in the Z1 direction from the opening of the first positioning portion 13e_1 formed on the second surface F2, and is the Z2-direction end of the first through hole 2 (i.e., the position of the second surface F2 on the Z axis) when the first imaginary cylinder VC1 is inserted in the Z2 direction from the opening of the first positioning portion 13e_1 formed on the first surface F1.

[0060] 11, the length of the first region RE1 along the Z-axis and the length of the second region RE2 along the Z-axis are equal to each other. These lengths may be different. However, from the viewpoint of facilitating insertion and removal of the first positioning pin 51b_1 into and from the first positioning portion 13e_1 while ensuring the rigidity of the first positioning portion 13e_1 necessary to prevent the first positioning portion 13e_1 from being damaged by the pressure acting on the first positioning portion 13e_1 when the first positioning pin 51b_1 is press-fitted, the length of each of the first region RE1 and the second region RE2 along the Z-axis is preferably 20% to 45% of the length of the first imaginary cylinder VC1 along the Z-axis, more preferably 25% to 40%, and even more preferably 28% to 38%. Furthermore, the length of the third region RE3 along the Z-axis is preferably 10% or more and 40% or less of the length of the first imaginary cylinder VC1 along the Z-axis, more preferably 20% or more and 50% or less, and even more preferably 24% or more and 44% or less.

[0061] In this way, the first positioning portion 13e_1 does not contact the Y2-direction portions of the second region RE2 and the third region RE3 relative to the first center line LC1, but contacts the Y2-direction portions of the first region RE1 relative to the first center line LC1, and does not contact the Y1-direction portions of the first region RE1 and the third region RE3 relative to the first center line LC1, but contacts the Y1-direction portions of the second region RE2 relative to the first center line LC1.

[0062] Therefore, the first positioning portion 13e_1 has a first contact portion CT1 that contacts a portion of the first region RE1 on the Y2 side with respect to the first center line LC1, and a second contact portion CT2 that contacts a portion of the second region RE2 on the Y1 side with respect to the first center line LC1. In this embodiment, the first contact portion CT1 and the second contact portion CT2 each extend continuously in the direction along the Z axis.

[0063] Furthermore, due to the presence of the third region RE3 as described above, in the cross section shown in Fig. 11, the shortest distance Ds (see Fig. 8) between the first contact portion CT1 and the second contact portion CT2 is equal to or greater than the maximum length Da (see Fig. 13) of the first positioning pin 51b_1 along the Y-axis. Note that the shortest distance Ds is preferably greater than the maximum length Da. The cross section shown in Fig. 11 is a cross section of the first positioning portion 13e_1 cut by a plane perpendicular to the Z-axis at a position along the X-axis where the length of the first imaginary cylinder VC1 along the Y-axis is greatest in plan view.

[0064] In this embodiment, the maximum length Da is equal to or greater than the maximum dimension Dv of the first imaginary cylinder VC1 in the direction along the Y-axis. This maximum dimension Dv corresponds to the diameter of a cross section of the first imaginary cylinder VC1 perpendicular to the Z-axis direction. Furthermore, the shortest distance Ds is greater than the maximum dimension Dv. Note that the shortest distance Ds, the maximum length Da, and the maximum dimension Dv are distances, lengths, or dimensions measured before the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1, that is, when the first positioning pin 51b_1 is not inserted into the first positioning portion 13e_1.

[0065] Here, "press-fitting the positioning pin 51b into the positioning portion 13e" means that the maximum length of the positioning pin 51b as viewed in the depth direction of the positioning portion 13e is equal to or greater than the diameter of a cross section perpendicular to the depth direction of an imaginary regular circular cylinder that is inserted to the deepest position of the positioning portion 13e and has the largest cross-sectional area as viewed in the depth direction of the positioning portion 13e. When the positioning portion 13e is press-fitted into the positioning pin 51b, the positioning portion 13e generally deforms outward relative to the positioning pin 51b, thereby enabling insertion.

[0066] 10, the first positioning portion 13e_1 has two boundary portions BO_1 facing each other in the direction along the X-axis. In a plan view seen in the direction along the Z-axis, the boundary portion BO_1 is a boundary between a portion where the thin-walled portion of the first positioning portion 13e_1 that defines the bottom surface of the second recess 4 defines the first through hole 2 and a portion where the thin-walled portion of the first positioning portion 13e_1 that defines the bottom surface of the first recess 3 defines the first through hole 2, i.e., a boundary between the first contact portion CT1 and the second contact portion CT2. Each of the two boundary portions BO_1 extends linearly from the first surface F1 to the second surface F2 along the Z-axis direction. Therefore, the two boundary portions BO_1 are not included in the Y1-direction portion and the Y2-direction portion of the first imaginary cylinder VC1 (in other words, each of the first region RE1, the second region RE2, and the third region RE3) relative to the first center line LC1.

[0067] Fig. 12 is a diagram illustrating a state in which the first positioning pin 51b_1 of the support body 51 is inserted into the first positioning portion 13e_1 illustrated in Fig. 7. Fig. 13 is a diagram illustrating a state in which the first positioning portion 13e_1 illustrated in Fig. 7 is inclined with respect to the first positioning pin 51b_1 of the support body 51. Fig. 14 is a schematic diagram for explaining attachment and detachment of the liquid jet head 1 according to the first embodiment to and from the support body 51.

[0068] FIG. 12 illustrates a state in which the insertion of the first positioning pin 51b_1 into the first positioning portion 13e_1 is completed when the side surface of the first positioning pin 51b_1 has a portion that matches the side surface of the first imaginary cylinder VC1 described above. In this state, as shown in FIG. 12, the first contact portion CT1 and the second contact portion CT2 each contact the side surface of the first positioning pin 51b_1. Although not shown, each of the two boundary portions BO_1 also contacts the side surface of the first positioning pin 51b_1. This contact positions the first positioning portion 13e_1 with respect to the first positioning pin 51b_1. In this embodiment, the first positioning pin 51b_1 and the first through hole 2 are fitted together in this state, and therefore, the insertion of the first positioning pin 51b_1 into the first positioning portion 13e_1 restricts movement of the liquid jet head 1 relative to the support body 51 in a plane perpendicular to the Z axis.

[0069] 12, a gap is provided between the first positioning pin 51b_1 and the first positioning portion 13e_1 by the first recess 3 and the second recess 4. Therefore, as shown in FIG. 13, the first positioning pin 51b_1 can be inserted into the first positioning portion 13e_1 by tilting the first positioning portion 13e_1 with respect to the extending direction of the first positioning pin 51b_1.

[0070] 14, when attaching the liquid jet head 1 to the support body 51, the first positioning portion 13e_1 can be inserted into the first positioning pin 51b_1 before the second positioning portion 13e_2 is inserted into the second positioning pin 51b_2. Furthermore, when removing the liquid jet head 1 from the support body 51, the second positioning portion 13e_2 can be removed from the second positioning pin 51b_2 before the first positioning portion 13e_1 is removed from the first positioning pin 51b_1. Hereinafter, a configuration example of the second positioning portion 13e_2 that facilitates attachment and detachment of the liquid jet head 1 to and from the support body 51 will be described.

[0071] FIG. 15 is a view of the second positioning portion 13e_2 of the liquid jet head 1 shown in FIG. 6, viewed in the Z2 direction. FIG. 16 is a cross-sectional view taken along line BB in FIG. 15. FIG. 17 is a view of the second positioning portion 13e_2 shown in FIG. 15, viewed in the Z1 direction. As shown in FIGS. 15 to 17, the second positioning portion 13e_2 has a second through hole 5, a third recessed portion 6, and a fourth recessed portion 7. The second through hole 5 is disposed between the third recessed portion 6 and the fourth recessed portion 7 in the direction along the Y axis. More specifically, the third recessed portion 6, the second through hole 5, and the fourth recessed portion 7 are aligned in this order in the Y2 direction.

[0072] The second through hole 5 is a hole that penetrates the flange portion 13h of the holder 13. Here, the second through hole 5 penetrates from the first surface F1 to the second surface F2 in the direction along the Z axis. In this embodiment, as shown in FIGS. 15 and 17, the second through hole 5 has a substantially oval shape with the longitudinal direction along the Y axis in a plan view. That is, the length of the second through hole 5 in the direction along the Y axis is longer than the length of the second through hole 5 in the direction along the X axis. Here, the length of the second through hole 5 in the direction along the X axis is equal to the length of the first through hole 2 in the direction along the X axis. Moreover, the length of the second through hole 5 in the direction along the Y axis is longer than the length of the first through hole 2 in the direction along the Y axis. Moreover, the first positioning pin 51b_1 and the second positioning pin 51b_2 in this embodiment have substantially the same shape. 5 are misaligned in the Y-axis direction due to a manufacturing error, the second through hole 5 has a longitudinal direction along the Y-axis in a plan view, so that the manufacturing error can be absorbed. Note that the shape of the second through hole 5 in a plan view is not limited to the examples shown in FIGS. 15 and 17. Furthermore, the dimensional relationship between the first through hole 2 and the second through hole 5 in a plan view varies depending on the dimensional relationship between the first positioning pin 51b_1 and the second positioning pin 51b_2 in a plan view, and is not limited to the examples shown in FIGS. 15 and 17.

[0073] The third recess 6 is provided on the first surface F1 and adjacent to a portion of the second through hole 5 on the Y1 direction side in plan view. On the other hand, the fourth recess 7 is provided on the second surface F2 and adjacent to a portion of the second through hole 5 on the Y2 direction side in plan view.

[0074] Here, the sum of the depths of the third recess 6 and the fourth recess 7 is greater than the distance between the first surface F1 and the second surface F2 (i.e., the thickness of the flange portion 13h of the holder 13). In other words, the sum of the length of the third contact portion CT3 (described later) in the direction along the Z axis and the length of the fourth contact portion CT4 (described later) in the direction along the Z axis is less than the distance between the first surface F1 and the second surface F2 (i.e., the thickness of the flange portion 13h of the holder 13). The shape of the third recess 6 in a plan view is not limited to the example shown in FIG. 15 and may be any shape. The shape of the fourth recess 7 in a plan view is not limited to the example shown in FIG. 17 and may be any shape. The depths of the third recess 6 and the fourth recess 7 are not particularly limited and may be any depth. However, if the depths of the first recess 3 and the third recess 6 are equal to each other and the depths of the second recess 4 and the fourth recess 7 are equal to each other, there is an advantage in that the manufacture and design of the holder 13 can be simplified.

[0075] FIG. 18 is a plan view illustrating the second imaginary cylinder VC2 set in the second positioning portion 13e_2 shown in FIG. 15. FIG. 19 is a cross-sectional view illustrating the second imaginary cylinder VC2 set in the second positioning portion 13e_2 shown in FIG. 15. FIG. 20 is a diagram illustrating a state in which the second positioning pin 51b_2 of the support body 51 is inserted into the second positioning portion 13e_2 shown in FIG. 15. The second imaginary cylinder VC2 is an imaginary cylinder that is inserted to the deepest position of the second positioning portion 13e_2 and has the largest cross-sectional area when viewed in the depth direction of the second positioning portion 13e_2 (the direction along the Z axis). The second imaginary cylinder VC2 is a right circular cylinder, similar to the first imaginary cylinder VC1. In the example shown in FIG. 18, the shape of the second imaginary cylinder VC2 in a plan view is elliptical. That is, the bottom surface of the second imaginary cylinder VC2 is elliptical. The shape of the second imaginary cylinder VC2 in plan view is defined based on the shape of the second positioning portion 13e_2 in plan view, and therefore may be a perfect circle. In this case, the second imaginary cylinder VC2 becomes a regular cylinder.

[0076] 18, the side surface of the second imaginary cylinder VC2 includes three regions divided along the Z axis: a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth region RE4 and the fifth region RE5. In this embodiment, the fifth region RE5 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the fourth region RE4, with respect to the direction along the Z axis.

[0077] The fourth region RE4 is a region that contacts the second positioning portion 13e_2 on the Y2 side with respect to the second center line LC2, which is the center line of the second imaginary cylinder VC2, but does not contact the second positioning portion 13e_2 on the Y1 side. The fifth region RE5 is a region that does not contact the second positioning portion 13e_2 on the Y2 side with respect to the second center line LC2, but contacts the second positioning portion 13e_2 on the Y1 side. The sixth region RE6 is a region that does not contact the second positioning portion 13e_2 on either the Y2 side or the Y1 side with respect to the second center line LC2. The second center line LC2 is a straight line that passes through the center of the bottom surface of the second imaginary cylinder VC2 and extends in the direction along the Z axis.

[0078] Here, the third recess 6 is adjacent to a portion of the fourth region RE4 on the Y1 direction side with respect to the second center line CL2. The fourth recess 7 is adjacent to a portion of the fifth region RE5 on the Y2 direction side with respect to the second center line CL2. The third recess 6 and the fourth recess 7 are each adjacent to the sixth region RE6. The second imaginary cylinder VC2 extends from the first surface F1 to the second surface F2 along the second through hole 5. The second imaginary cylinder VC2 of this embodiment extends from one end to the other end of the second through hole 5 in the Z axis direction. In other words, the deepest position of the second positioning portion 13e_2 is the Z1-direction end of the second through hole 5 (i.e., the position of the first surface F1 on the Z axis) when the second imaginary cylinder VC2 is inserted in the Z1 direction from the opening of the second positioning portion 13e_2 formed on the second surface F2, and is the Z2-direction end of the second through hole 5 (i.e., the position of the second surface F2 on the Z axis) when the second imaginary cylinder VC2 is inserted in the Z2 direction from the opening of the second positioning portion 13e_2 formed on the first surface F1.

[0079] In the example shown in FIG. 18 , the length of the fourth region RE4 in the direction along the Z axis and the length of the fifth region RE5 in the direction along the Z axis are equal to each other. These lengths may be different. However, the length of each of the fourth region RE4 and the fifth region RE5 in the direction along the Z axis is preferably 20% to 45% of the length of the second imaginary cylinder VC2 in the direction along the Z axis, more preferably 25% to 40% and even more preferably 28% to 38%. Furthermore, the length of the sixth region RE6 in the direction along the Z axis is preferably 10% to 40% of the length of the second imaginary cylinder VC2 in the direction along the Z axis, more preferably 20% to 50% and even more preferably 24% to 44%.

[0080] In this way, the second positioning portion 13e_2 does not contact the Y2-direction portions of the fifth region RE5 and the sixth region RE6 relative to the second center line LC2, but contacts the Y2-direction portions of the fourth region RE4 relative to the second center line LC2, and does not contact the Y1-direction portions of the fourth region RE4 and the sixth region RE6 relative to the second center line LC2, but contacts the Y1-direction portions of the fifth region RE5 relative to the second center line LC2.

[0081] Therefore, the second positioning portion 13e_2 has a third contact portion CT3 that contacts a portion of the fourth region RE4 on the Y2 side with respect to the second center line LC2, and a fourth contact portion CT4 that contacts a portion of the fifth region RE5 on the Y1 side with respect to the second center line LC2. The third contact portion CT3 and the fourth contact portion CT4 each extend continuously in the direction along the Z axis.

[0082] 17, the second positioning portion 13e_2 has two boundary portions BO_2 facing each other in the direction along the X-axis. In a plan view seen in the direction along the Z-axis, the boundary portion BO_2 is a boundary between a portion where the thin-walled portion of the second positioning portion 13e_2 that defines the bottom surface of the third recessed portion 6 defines the second through hole 5 and a portion where the thin-walled portion of the second positioning portion 13e_2 that defines the bottom surface of the fourth recessed portion 7 defines the second through hole 5, i.e., a boundary between the third contact portion CT3 and the fourth contact portion CT4. Each of the two boundary portions BO_2 has a predetermined length in the direction along the Y-axis in a plan view, and therefore extends in a planar shape from the first surface F1 to the second surface F2 along the Z-axis direction. Therefore, the two boundary portions BO_2 are not included in the portions of the second imaginary cylinder VC2 (in other words, the fourth region RE4, the fifth region RE5, and the sixth region RE6) on the Y1 side and the Y2 side of the second center line LC2.

[0083] Here, as described above, since the length of the second through hole 5 in the direction along the Y-axis is longer than the length of the second through hole 5 in the direction along the X-axis, when the shape of the second positioning pin 51b_2 is circular in a plan view, one or both of the third contact portion CT3 and the fourth contact portion CT4 do not come into contact with the side surface of the second positioning pin 51b_2, as shown in Fig. 20. In other words, since the length of the second through hole 5 in the direction along the Y-axis is longer than the maximum length of the second positioning pin 51b_2 in the direction along the Y-axis, it is possible to easily attach and detach the liquid jet head 1 to and from the support body 51 as shown in Fig. 14 described above.

[0084] Furthermore, due to the presence of the fourth region RE4 and the sixth region RE6 as described above, the shortest distance between the third contact portion CT3 and the fourth contact portion CT4 in the cross section shown in Fig. 18 is greater than the maximum length of the second imaginary cylinder VC2 in the direction along the Y-axis. This makes it easier to attach and detach the liquid jet head 1 to and from the support body 51 as shown in Fig. 14 described above. Note that the shortest distance between the third contact portion CT3 and the fourth contact portion CT4 and the maximum length of the second positioning pin 51b_2 in the direction along the Y-axis are lengths or distances measured before the second positioning pin 51b_2 is inserted into the second positioning portion 13e_2, that is, in a state where the second positioning pin 51b_2 is not inserted into the second positioning portion 13e_2.

[0085] Furthermore, in a state where the second positioning pin 51b_2 is inserted into the second positioning portion 13e_2, the second positioning portion 13e_2 comes into contact with both ends of the side surface of the second positioning pin 51b_2 in the direction along the X-axis. This contact restricts movement of the second positioning portion 13e_2 relative to the second positioning pin 51b_2 in the direction along the X-axis. Then, by inserting the second positioning pin 51b_2 into the second positioning portion 13e_2 in addition to inserting the first positioning pin 51b_1 into the first positioning portion 13e_1 described above, rotation of the liquid jet head 1 relative to the support body 51 in a plane perpendicular to the Z-axis is restricted.

[0086] As described above, the liquid jet device 100 includes the liquid jet head 1 and the support body 51 having the first positioning pin 51b_1. The liquid jet head 1 is supported by the support body 51 having the first positioning pin 51b_1, and jets ink, which is an example of "liquid." Here, as described above, the liquid jet head 1 includes the first positioning portion 13e_1 into which the first positioning pin 51b_1 is inserted, thereby positioning the liquid jet head 1 with respect to the support body 51.

[0087] When the first virtual cylinder VC1 is defined as an imaginary cylinder that is inserted to the deepest position of the first positioning portion 13e_1 and has the largest cross-sectional area when viewed in a first direction (direction along the Z axis), which is the depth direction of the first positioning portion 13e_1, the side of the first virtual cylinder VC1 includes three regions divided in the first direction: a first region RE1, a second region RE2, and a third region RE3 arranged between the first region RE1 and the second region RE2.

[0088] The first region RE1 contacts the first positioning portion 13e_1 on a first side (Y2 direction side) that is one side in a second direction (direction along the Y axis) perpendicular to the first direction with respect to a first center line LC1 that is the center line of the first imaginary cylinder VC1, but does not contact the first positioning portion 13e_1 on a second side (Y1 direction side) that is the other side in the second direction. The second region RE2 does not contact the first positioning portion 13e_1 on the first side (Y2 direction side) with respect to the first center line LC1, but contacts the first positioning portion 13e_1 on the second side (Y1 direction side). The third region RE3 does not contact the first positioning portion 13e_1 on both the first side (Y2 direction side) and the second side (Y1 direction side) with respect to the first center line LC1.

[0089] In the above-described liquid ejection head 1, the first region RE1 contacts the first positioning portion 13e_1 on the first side (Y2 direction side) of the first center line LC1, and the second region RE2 contacts the first positioning portion 13e_1 on the second side (Y1 direction side) of the first center line LC1. Therefore, when the side surface of the first positioning pin 51b_1 corresponds to the side surface of the first imaginary cylinder VC1, the first positioning pin 51b_1 can be inserted into the first positioning portion 13e_1 to position the liquid ejection head 1 relative to the support body 51.

[0090] Consider a comparative example in which the positioning portion of the liquid ejection head, into which the positioning pin of the support is inserted, is configured solely with a through-hole extending in the direction along the Z axis. This comparative example does not have a first recess 3 or a second recess 4 like the first positioning portion 13e_1. Therefore, in this comparative example, to insert or remove the positioning portion relative to the positioning pin, the liquid ejection head must be slid relative to the support along the protruding direction of the positioning pin. In this comparative example, the ease of inserting or removing the positioning portion relative to the positioning pin is poor. Specifically, the narrower the gap between the positioning pin and the positioning portion when inserted into the positioning portion, the poorer the ease of insertion or removal. Particularly when inserting the positioning pin into the positioning portion by press-fitting, friction occurs between the positioning pin and the positioning portion during insertion or removal, requiring strong force for insertion or removal. Furthermore, when inserting the positioning pin into the positioning portion, two positioning pins must be inserted into the two positioning portions simultaneously, which is not easy. Furthermore, because it is difficult for an operator to visually confirm the position of the ejection surface of the liquid ejection head, there is a risk that the ejection surface will be damaged by hitting the positioning pin or the like.

[0091] On the other hand, in this embodiment, the first region RE1 does not contact the first positioning portion 13e_1 on the second side (Y1 direction side) with respect to the first center line LC1, the second region RE2 does not contact the first positioning portion 13e_1 on the first side (Y2 direction side) with respect to the first center line LC1, and the third region RE3 does not contact the first positioning portion 13e_1 on both the first side (Y2 direction side) and the second side (Y1 direction side) with respect to the first center line LC1. Therefore, the liquid jet head 1 can be attached to and detached from the support body 51 by tilting the liquid jet head 1 with respect to the direction in which the first positioning pin 51b_1 extends. In other words, with this configuration, the shortest distance Ds between the first contact portion CT1 and the second contact portion CT2 becomes larger than the maximum dimension Dv of the first imaginary cylinder VC1 in the direction along the Y axis (corresponding to the maximum dimension of the first through hole 2 in the direction along the Y axis). Therefore, compared to the comparative example described above, the insertability and removability of the first positioning portion 13e_1 into the first positioning pin 51b_1 is superior, thereby improving the attachability and detachability of the liquid jet head 1 to the support body 51. Furthermore, since the first positioning portion 13e_1 can be inserted into the first positioning pin 51b_1 before the second positioning portion 13_2 is inserted into the second positioning pin 51b_2, it is no longer necessary to insert two positioning portions into two positioning pins at the same time as in the comparative example, thereby improving the attachability and detachability of the liquid jet head 1 to the support body 51. Furthermore, when attaching or detaching the liquid jet head 1 to or from the support body 51, by tilting the liquid jet head 1 with respect to the extending direction of the first positioning pin 51b_1, an operator can easily visually recognize the position of the ejection surface FN, thereby reducing the possibility of the ejection surface FN coming into contact with the positioning pin 51b, etc.

[0092] As described above, the liquid jet head 1 includes the holder 13, which is an example of a "first member." The holder 13 has a first positioning portion 13e_1, a first surface F1, and a second surface F2 opposite to the first surface F1. The first positioning portion 13e_1 includes a first through-hole 2 that penetrates from the second surface F2 to the first surface F1 in a first direction (Z1 direction), a first recess 3 provided in the first surface F1, and a second recess 4 provided in the second surface F2.

[0093] Here, the first through hole 2 is disposed between the first recess 3 and the second recess 4 in the second direction (the direction along the Y axis). The first recess 3 is adjacent to the first region RE1 on the second side (Y1 direction side) with respect to the first center line LC1. The second recess 4 is adjacent to the second region RE2 on the first side (Y2 direction side) with respect to the first center line LC1. Each of the first recess 3 and the second recess 4 is adjacent to the third region RE3. The first imaginary cylinder VC1 extends from the first surface F1 to the second surface F2 along the first through hole 2. Therefore, the first through hole 2, the first recess 3, and the second recess 4 can be formed by processing both the first surface F1 and the second surface F2. As a result, the manufacturing of the liquid jet head 1 can be simplified compared to a configuration in which the first positioning portion 13e_1 is a blind hole (bottomed hole).

[0094] As described above, the length of the first region RE1 in the first direction (the direction along the Z axis) and the length of the second region RE2 in the first direction (the direction along the Z axis) are equal to each other. This makes it possible to equalize the rigidity of the first contact portion CT1 and the second contact portion CT2 of the first positioning portion 13e_1, thereby preferably preventing one of the first contact portion CT1 and the second contact portion CT2 from being insufficient in rigidity relative to the other.

[0095] Furthermore, as described above, the length of each of the first region RE1 and the second region RE2 along the first direction (direction along the Z-axis) is 20% to 45% of the length of the first imaginary cylinder VC1 along the first direction (direction along the Z-axis). This improves the insertability of the first positioning pin 51b_1 into the first positioning portion 13e_1 and increases the rigidity of the first positioning portion 13e_1.

[0096] As described above, the first positioning portion 13e_1 has a first contact portion CT1 that contacts the first side (Y2 direction side) of the first region RE1 with respect to the first center line LC1, and a second contact portion CT2 that contacts the second side (Y1 direction side) of the second region RE2 with respect to the first center line LC1. The first contact portion CT1 and the second contact portion CT2 each extend continuously in the first direction (direction along the Z axis). Therefore, the first contact portion CT1 and the second contact portion CT2 can each be in surface contact with the first positioning pin 51b_1 along the first direction (direction along the Z axis). As a result, the liquid jet head 1 can be positioned with high precision relative to the support body 51.

[0097] Here, as described above, among the positions in the third direction (direction along the X-axis) perpendicular to the first direction (direction along the Z-axis) and the second direction (direction along the Y-axis), at the position where the length of the first virtual cylinder VC1 along the second direction (direction along the Y-axis) is maximum when viewed in the first direction (direction along the Z-axis), the shortest distance Ds between the first contact portion CT1 and the second contact portion CT2 in a cross section of the first positioning portion 13e_1 cut by a plane along both the first direction (direction along the Z-axis) and the second direction (direction along the Y-axis) is greater than or equal to the maximum length Da of the first positioning pin 51b_1 along the second direction (direction along the Y-axis). Therefore, when the first positioning portion 13e_1 is tilted with respect to the direction in which the first positioning pin 51b_1 extends, the interference between the first positioning portion 13e_1 and the first positioning pin 51b_1 can be made smaller than when the shortest distance Ds is less than the maximum length Da. As a result, the attachability and detachability of the liquid jet head 1 to the support body 51 can be improved. Note that it is more preferable that the shortest distance Ds is greater than the maximum length Da. As a result, when the first positioning portion 13e_1 is tilted with respect to the direction in which the first positioning pin 51b_1 extends, a gap is provided between the first positioning portion 13e_1 and the first positioning pin 51b_1, which can further improve the attachability and detachability of the liquid jet head 1 to the support body 51.

[0098] Furthermore, as described above, the liquid jet head 1 includes an ejection surface FN having a plurality of nozzles N that eject ink, and the ejection surface FN is disposed on the second side (Y1 direction side) as viewed from the first positioning portion 13e_1. The second region RE2 is disposed in the direction (Z2 direction) in which the ejection surface FN faces relative to the first region RE1 in the first direction (direction along the Z axis). In other words, the second region RE2 is closer to the protruding surface FP than the first region RE1 in the first direction (direction along the Z axis). This allows the liquid jet head 1 to be attached to and detached from the support body 51 so as to be tilted with respect to the direction in which the first positioning pin 51b_1 extends. Furthermore, as in this embodiment, it is preferable that the longitudinal direction of the liquid jet head 1 is a direction along the Y axis. In this case, the visibility of the ejection surface FN is further improved by combining this with the above-described configuration. As shown in Figures 4 and 6, as long as the ejection surface FN is not positioned on the first side (Y2 direction side) when viewed from the first positioning portion 13e_1, a part of the ejection surface FN may be located at a position shifted in the direction along the X axis relative to the first positioning portion 13e_1.

[0099] As described above, the liquid jet head 1 further includes the second positioning portion 13e_2 into which the second positioning pin 51b_2 provided on the support body 51 is inserted, thereby positioning the liquid jet head 1 with respect to the support body 51. The first positioning portion 13e_1 and the second positioning portion 13e_2 are arranged side by side in the second direction (the direction along the Y-axis). Therefore, the first positioning portion 13e_1 and the second positioning portion 13e_2 can regulate the position and posture of the liquid jet head 1 with respect to the support body 51. Furthermore, after the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1, the second positioning pin 51b_2 can be inserted into the second positioning portion 13e_2. Therefore, the attachability and detachability of the liquid jet head 1 with respect to the support body 51 can be improved. For high-precision positioning, it is preferable that the second direction (direction along the Y-axis) in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned coincides with the longitudinal direction (direction along the Y-axis) of the liquid jet head 1, as shown in Figures 4 and 6.

[0100] Furthermore, as described above, the second positioning portion 13e_2 is disposed on the second side (Y1 direction side) with respect to the first positioning portion 13e_1. The second region RE2 is disposed closer to the protruding surface FP, from which the first positioning pin 51b_1 of the support body 51 protrudes, than the first region RE1 in the first direction (direction along the Z axis).

[0101] Furthermore, as described above, if the second virtual cylinder VC2 is an imaginary cylinder that is inserted to the deepest position of the second positioning portion 13e_2 and has the largest cross-sectional area when viewed in the first direction (direction along the Z axis), the side of the second virtual cylinder VC2 includes three regions divided in the first direction (direction along the Z axis): a fourth region RE4, a fifth region RE5, and a sixth region RE6 arranged between the fourth region RE4 and the fifth region RE5.

[0102] The fourth region RE4 contacts the second positioning portion 13e_2 on a first side (Y2 direction side) with respect to a second center line LC2, which is the center line of the second imaginary cylinder VC2, but does not contact the second positioning portion 13e_2 on a second side (Y1 direction side). The fifth region RE5 does not contact the second positioning portion 13e_2 on the first side (Y2 direction side) with respect to the second center line LC2, but contacts the second positioning portion 13e_2 on the second side (Y1 direction side). The sixth region RE6 does not contact the second positioning portion 13e_2 on either the first side (Y2 direction side) or the second side (Y1 direction side) with respect to the second center line LC2. The direction from the second region RE2 to the first region RE1 is the same as the direction from the fifth region RE5 to the fourth region RE4. Therefore, the second positioning portion 13e_2 has excellent insertability into and removal from the second positioning pin 51b_2, and therefore, the attachability and detachability of the liquid jet head 1 to and from the support body 51 can be improved.

[0103] As described above, in the first embodiment, the second positioning portion 13e_2 was configured with the second through hole 5, the third recess 6, and the fourth recess 7. However, the second positioning portion 13e_2 may be configured with only the second through hole 5, thereby eliminating the third recess 6 and the fourth recess 7. This is because the second positioning portion 13e_2 is elongated in the direction along the Y-axis, and because the inclination angle of the ejection surface FN when the second positioning pin 51b_2 is inserted into the second positioning portion 13e_2 with respect to the ejection surface FN in a state in which the liquid jet head 1 is supported by the support body 51 is smaller than the inclination angle of the ejection surface FN when the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1. This simplifies the structure of the second positioning portion 13e_2.

[0104] In the first embodiment described above, the first recess 3 and the second recess 4 are point-symmetric with respect to the center of the first positioning portion 13e_1, so the maximum dimension D1_a of the first recess 3 in the direction along the Y axis and the maximum dimension D1_b of the second recess 4 in the direction along the Y axis are the same. Furthermore, the maximum dimension D1_a is the same at any position on the X axis. The same is true for the maximum dimension D1_b. Furthermore, the third recess 6 and the fourth recess 7 are point-symmetric with respect to the center of the second positioning portion 13e_2, so the maximum dimension D2_a of the third recess 6 in the direction along the Y axis and the maximum dimension D2_b of the fourth recess 7 in the direction along the Y axis are the same. Furthermore, the maximum dimension D2_a is the same at any position on the X axis. The same is true for the maximum dimension D2_b.

[0105] Furthermore, as described above, because the second positioning portion 13e_2 is elongated in the direction along the Y-axis, and the inclination angle of the ejection surface FN when the second positioning pin 51b_2 is inserted into the second positioning portion 13e_2 with respect to the ejection surface FN in a state in which the liquid jet head 1 is supported by the support body 51 is smaller than the inclination angle of the ejection surface FN when the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1, with respect to the ejection surface FN. Therefore, the maximum dimensions D2_a and D2_b can be made smaller than the maximum dimensions D1_a and D1_b, respectively, and the dimension of the second positioning portion 13e_2 along the Y-axis direction can be reduced.

[0106] 14, a gap G2 between the side surface of the liquid jet head 1 facing the Y1 direction and the inner circumferential surface of the opening 51a is preferably larger than a gap G1 between the side surface of the liquid jet head 1 facing the Y2 direction and the inner circumferential surface of the opening 51a. In addition, the positioning portion 13e is preferably disposed closer to the ejection surface FN than the center of the liquid jet head 1 in the direction along the Z axis. With this configuration, it becomes easier to attach and detach the liquid jet head 1 to and from the support body 51 so as to be tilted with respect to the extension direction of the first positioning pin 51b_1.

[0107] 2. Second embodiment A second embodiment of the present disclosure will be described below, focusing on the differences from the first embodiment. Note that the second to sixth embodiments and modified examples 1 to 4, which will be described later, will also be described based on coordinate axes that are based on a local coordinate system that is based on the liquid jet head, as in the first embodiment.

[0108] Fig. 21 is a view of a first positioning portion 13e_1 of a liquid jet head according to a second embodiment, viewed in the Z2 direction. Fig. 22 is a cross-sectional view taken along the line EE in Fig. 21. Fig. 23 is a view of the first positioning portion 13e_1 shown in Fig. 21, viewed in the Z1 direction. The first positioning portion 13e_1 of this embodiment is configured in the same manner as the first positioning portion 13e_1 of the first embodiment, except that it has a first through hole 2A, a first recess 3A, and a second recess 4A instead of the first through hole 2, the first recess 3, and the second recess 4. Figs. 21 to 23 show a portion of a holder 13A having a first through hole 2A, a first recess 3A, and a second recess 4A.

[0109] The first through hole 2A is configured similarly to the first through hole 2 of the first embodiment, except for its different shape in plan view. The shape of the first through hole 2A in plan view is substantially square. Here, the first through hole 2A has a pair of sides along the Y axis and a pair of sides along the X axis in plan view. The length of the first through hole 2A in the direction along the Y axis is equal to the length of the first through hole 2A in the direction along the X axis. "Substantially square" refers to, for example, a shape in which the corners of a square are rounded or C-chamfered. The shape of the first through hole 2A in plan view may be substantially quadrangular, rectangular, or square.

[0110] 21, the first imaginary cylinder VC1 is indicated by a two-dot chain line. In this embodiment, the first imaginary cylinder VC1 is in contact with the first positioning portion 13e_1 at four locations: both ends of the first positioning portion 13e_1 in the direction along the X axis and both ends of the first positioning portion 13e_1 in the direction along the Y axis. Specifically, in a plan view, the first region RE1 is in point contact with the first positioning portion 13e_1 at portions on the Y2 direction side, the X1 direction side, and the X2 direction side with respect to the first center line LC1, but is not in contact with the first positioning portion 13e_1 at portions on the Y1 direction side with respect to the first center line LC1. In a plan view, the second region RE2 is in point contact with the first positioning portion 13e_1 at portions on the Y1 direction side with respect to the first center line LC1, but is not in contact with the first positioning portion 13e_1 at portions on the Y2 direction side, the X1 direction side, and the X2 direction side with respect to the first center line LC1. In a planar view, the third region RE3 is in point contact with the first positioning portion 13e_1 at each portion on the X1-direction side and the X2-direction side relative to the first center line LC1, and is not in contact with the first positioning portion 13e_1 at each portion on the Y1-direction side and the Y2-direction side relative to the first center line LC1.

[0111] Therefore, each of the first contact portion CT1 and the second contact portion CT2 can be brought into line contact with the first positioning pin 51b_1 shown in the first embodiment along the direction along the Z-axis. Therefore, even with the first through hole 2A having such a shape in a plan view, it is possible to restrict movement of the first positioning portion 13e_1 relative to the first positioning pin 51b_1 in a plane perpendicular to the Z-axis. Note that the relationship in magnitude between the length of the first through hole 2A in the direction along the Y-axis and the length of the first through hole 2A in the direction along the X-axis is determined depending on the shape of the first positioning pin 51b_1, and is not particularly limited.

[0112] The first recess 3A is configured similarly to the first recess 3 of the first embodiment, except for its different shape in plan view. The shape of the first recess 3A in plan view is substantially rectangular. Here, the first recess 3A has a longitudinal shape extending along the sides of the first through hole 2A in the Y1 direction. The first recess 3A also has a pair of sides extending along the Y axis and a pair of sides extending along the X axis in plan view. Furthermore, the length of the first recess 3A in the direction along the Y axis is shorter than the length of the first recess 3A in the direction along the X axis. The length of the first recess 3A in the direction along the X axis is equal to the length of the first through hole 2A in the direction along the X axis. Note that the relationship between these lengths is not particularly limited.

[0113] The second recess 4A is configured similarly to the second recess 4 of the first embodiment, except for its shape in plan view. The shape of the second recess 4A in plan view is a substantial C-shape that follows three sides of the first through hole 2A other than the side in the Y1 direction.

[0114] According to the second embodiment described above, it is also possible to improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51.

[0115] 3. Third embodiment The third embodiment of the present disclosure will be described below, focusing on the differences from the first embodiment.

[0116] Fig. 24 is a view of a first positioning portion 13e_1 of a liquid jet head according to a third embodiment, viewed in the Z2 direction. Fig. 25 is a cross-sectional view taken along line FF in Fig. 24. Fig. 26 is a view of the first positioning portion 13e_1 shown in Fig. 24, viewed in the Z1 direction. The first positioning portion 13e_1 of this embodiment is configured similarly to the first positioning portion 13e_1 of the first embodiment, except that it has a first through hole 2B, a first recess 3B, and a second recess 4B instead of the first through hole 2, the first recess 3, and the second recess 4. Figs. 24 to 26 show a portion of a holder 13B having a first through hole 2B, a first recess 3B, and a second recess 4B.

[0117] The first through hole 2B has the same configuration as the first through hole 2 of the first embodiment, except for its different planar shape. The planar shape of the first through hole 2B is a combination of a semicircle and a rectangle. Here, the first through hole 2B has, in plan view, a pair of sides along the Y axis, one side connecting the ends of the pair of sides along the Y axis in the Y1 direction along the X axis, and a convex arc connecting the ends of the pair of sides along the Y axis in the Y2 direction. In FIG. 24, a first imaginary cylinder VC1 is indicated by a two-dot chain line. The first through hole 2B having such a planar shape can also restrict movement of the first positioning portion 13e_1 relative to the first positioning pin 51b_1 in a plane perpendicular to the Z axis.

[0118] The first recess 3B has the same configuration as the first recess 3 of the first embodiment, except for its shape in a plan view. The first recess 3B has a semicircular shape in a plan view. The first positioning portion 13e_1 has a first contact portion CT1 that contacts a portion of the first region RE1 on the Y2 direction side with respect to the first center line LC1.

[0119] The second recess 4B is configured similarly to the second recess 4 of the first embodiment, except for its shape in a plan view. The second recess 4B has a substantially C-shape in a plan view that follows the periphery of the first through hole 2B except for the side in the Y1 direction. The first positioning portion 13e_1 has a second contact portion CT2 that contacts a portion of the second region RE2 on the Y1 direction side with respect to the first center line LC1.

[0120] According to the third embodiment described above, it is also possible to improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51.

[0121] 4. Fourth embodiment The fourth embodiment of the present disclosure will be described below, focusing on the differences from the first embodiment.

[0122] Fig. 27 is a view of a first positioning portion 13e_1 of a liquid jet head according to a fourth embodiment, viewed in the Z2 direction. Figs. 28 and 29 are cross-sectional views taken along line GG in Fig. 27. The first positioning portion 13e_1 of this embodiment is configured in the same manner as the first positioning portion 13e_1 of the first embodiment, except that it has a first recess 3C and a second recess 4C instead of the first recess 3 and the second recess 4. Figs. 27 to 29 show a portion of a holder 13C having a first through-hole 2, a first recess 3C, and a second recess 4C.

[0123] The first recess 3C is configured similarly to the first recess 3 of the first embodiment, except that it is chamfered near the boundary with the first through hole 2. The second recess 4C is configured similarly to the second recess 4 of the first embodiment, except that it is chamfered near the boundary with the first through hole 2. In the illustration, these chamfers are C-chamfers, but this is not limiting, and for example, these chamfers may be R-chamfers.

[0124] In this embodiment, the first positioning portion 13e_1 includes a first contact portion CT1 that contacts a first side (Y2 direction side) of the first region RE1 with respect to the first center line LC1, and a first inclined surface FL1 that is a surface continuous with the first contact portion CT1 and extends in a direction that intersects the first direction (direction along the Z axis) without being orthogonal to the first direction. Therefore, when the first positioning portion 13e_1 is inclined with respect to the direction in which the first positioning pin 51b_1 extends, the gap between the first positioning portion 13e_1 and the first positioning pin 51b_1 can be made larger than in a configuration that does not include the first inclined surface FL1. As a result, the ease of attachment and detachment of the liquid jet head to and from the support body 51 can be improved.

[0125] Here, the first positioning portion 13e_1 has a second contact portion CT2 that contacts the second side (Y1 direction side) of the second region RE2 with respect to the first center line LC1, and a second inclined surface FL2 that is a surface continuous with the second contact portion CT2 and extends in a direction that intersects the first direction (direction along the Z axis) without being orthogonal to the first direction. The first inclined surface FL1 and the second inclined surface FL2 are parallel to each other. Such first inclined surface FL1 and second inclined surface FL2 have the advantage of making it easy to ensure the thickness of the member that constitutes the first positioning portion 13e_1. Note that the first positioning portion 13e_1 may be provided with only either the first inclined surface FL1 or the second inclined surface FL2.

[0126] Furthermore, the first inclined surface FL1 and the second inclined surface FL2 have portions that overlap with each other when viewed in the second direction (the direction along the Y-axis). Such first inclined surface FL1 and second inclined surface FL2 have the advantage of making it easier to ensure the thickness of the member that constitutes the first positioning portion 13e_1. In this embodiment, a portion of the first inclined surface FL1 and a portion of the second inclined surface FL2 overlap with each other when viewed in the second direction (the direction along the Y-axis). However, the entire first inclined surface FL1 and the entire second inclined surface FL2 may overlap with each other when viewed in the second direction (the direction along the Y-axis). Note that the first inclined surface FL1 and the second inclined surface FL2 do not necessarily have to overlap with each other when viewed in the second direction (the direction along the Y-axis).

[0127] Furthermore, it is preferable that the length of the first inclined surface FL1 and the length of the second inclined surface FL2 are the same. Furthermore, as shown in Fig. 28, it is preferable that a side wall that defines the second recess 4C of the first positioning portion 13e_1 is not provided on an extension line of the first inclined surface FL1 that extends along the first inclined surface FL1. Similarly, it is preferable that a side wall that defines the first recess 3C of the first positioning portion 13e_1 is not provided on an extension line of the second inclined surface FL2.

[0128] Furthermore, it is preferable that the angle θ1 formed between the first slant surface FL1 and a line along the Z axis is equal to the angle θ2 formed between the second slant surface FL2 and a line along the Z axis. The angle θ1 is an acute angle, which can be expressed as the rotation angle obtained by rotating the first slant surface FL1 around the boundary between the first slant surface FL1 and the first contact portion CT1 as the rotation axis until the first slant surface FL1 becomes parallel to the Z axis, as shown in Fig. 29. The angle θ2 is defined in a similar manner.

[0129] Furthermore, among positions in a third direction (direction along the X-axis) perpendicular to the first direction (direction along the Z-axis) and the second direction (direction along the Y-axis), at a position where the length of the first imaginary cylinder VC1 along the second direction (direction along the Y-axis) is maximum as viewed in the first direction (direction along the Z-axis), an angle θ formed by the first inclined surface FL1 and a line segment LS connecting the first contact portion CT1 and the second contact portion CT2 at the shortest distance is S is 90 degrees or more. Therefore, when the first positioning portion 13e_1 is inclined with respect to the direction in which the first positioning pin 51b_1 extends, the gap between the first positioning portion 13e_1 and the first positioning pin 51b_1 can be made larger than in a configuration in which the angle is smaller than 90 degrees. As a result, the ease of attachment and detachment of the liquid jet head to the support body 51 can be improved. The line segment LS in this embodiment is a line segment that connects the boundary portion between the first inclined surface FL1 and the first contact portion CT1 and the boundary portion between the second inclined surface FL2 and the second contact portion CT2.

[0130] The angle θ S In other words, the angle θ is the rotation angle of the first inclined surface FL1 around the boundary between the first inclined surface FL1 and the first contact portion CT1 as the rotation axis until the first inclined surface FL1 is parallel to the line segment LS. S is preferably approximately 90 degrees. This ensures the rigidity of the first positioning portion 13e_1. Note that approximately 90 degrees refers to 90 degrees ±2 degrees, taking into account manufacturing errors. Also, approximately 90 degrees includes 90 degrees.

[0131] Fig. 30 is a view of a second positioning portion 13e_2 of a liquid jet head according to a fourth embodiment, viewed in the Z2 direction. Figs. 31 and 32 are cross-sectional views taken along line HH in Fig. 30. The second positioning portion 13e_2 of this embodiment is configured in the same manner as the second positioning portion 13e_2 of the first embodiment, except that it has a third recess 6C and a fourth recess 7C instead of the third recess 6 and the fourth recess 7. Figs. 30 and 31 show a portion of a holder 13C having a second through-hole 5, a third recess 6C, and a fourth recess 7C.

[0132] The third recess 6C is configured similarly to the third recess 6 of the first embodiment, except that it is chamfered near the boundary with the second through hole 5. The fourth recess 7C is configured similarly to the fourth recess 7 of the first embodiment, except that it is chamfered near the boundary with the second through hole 5. In the illustration, these chamfers are C-chamfers, but this is not limiting, and for example, these chamfers may be R-chamfers.

[0133] The second positioning portion 13e_2 includes a third contact portion CT3 that contacts a first side (Y2 direction side) of the fourth region RE4 relative to the second center line LC2, a fourth contact portion CT4 that contacts a second side (Y1 direction side) of the fifth region RE5 relative to the second center line LC2, a third inclined surface FL3 that is a surface continuous with the third contact portion CT3 and extends in a direction that intersects but is not perpendicular to the first direction (direction along the Z axis), and a fourth inclined surface FL4 that is a surface continuous with the fourth contact portion CT4 and extends in a direction that intersects but is not perpendicular to the first direction (direction along the Z axis).

[0134] Furthermore, it is preferable that the angle θ3 formed between the third inclined surface FL3 and a line along the Z axis is equal to the angle θ4 formed between the fourth inclined surface FL4 and a line along the Z axis. It is also preferable that the angles θ3 and θ4 are each smaller than the angles θ1 and θ2, respectively. This ensures the rigidity of the second positioning portion 13e_2 without impairing the insertability and removal of the second positioning portion 13e_2 relative to the second positioning pin 51b_2. The angles θ3 and θ4 are defined in the same way as the angle θ1.

[0135] According to the fourth embodiment described above, it is also possible to improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51.

[0136] 5. Fifth embodiment The fifth embodiment of the present disclosure will be described below, focusing on the differences from the first embodiment.

[0137] 33 is a cross-sectional view showing a state in which a first positioning pin 51b_1 is inserted into a first positioning portion 13e_1 of a liquid jet head according to a fifth embodiment. The first positioning portion 13e_1 of this embodiment is configured similarly to the first positioning portion 13e_1 of the first embodiment, except that it is configured with a bottomed hole 8 having a bottom wall FB. FIG. 33 shows a portion of a holder 13D having a bottomed hole 8.

[0138] The blind hole 8 is a hole having a shape combining a substantially cylindrical blind hole having a central axis on the first center line LC1 and a substantially cylindrical blind hole having a center on an axis line LL inclined about the X-axis relative to the first center line LC1. The blind hole 8 is formed on the hole forming surface FO facing the protruding surface FP of the support body 51 of the holder 13D. Here, the first center line LC1 and the axis line LL intersect, and the intersection is located within the blind hole 8. In the example shown in FIG. 33 , the blind holes have the same depth. Furthermore, the cross-sectional shapes of the blind holes are also the same. The depths of the blind holes may be different from each other, and the cross-sectional shapes of the blind holes may be different from each other. The bottom wall FB of the substantially cylindrical blind hole having a central axis on the first center line LC1 includes both a curved surface and a flat surface. The bottom wall FB of the substantially cylindrical blind hole having a center on the axis line LL also includes both a curved surface and a flat surface. That is, the bottom wall FB of the bottomed hole 8 of this embodiment includes a curved surface and a flat surface, as shown in FIG.

[0139] In this way, if the shape of the first positioning portion 13e_1 is a bottomed hole rather than a through hole, and the bottom wall FB includes a curved surface, or the area of ​​the bottom wall FB in a plan view along the Z axis is smaller than the cross-sectional area of ​​the first positioning pin 51b_1 in a plan view along the Z axis, the bottom wall FB is not provided in the range of the first positioning portion 13e_1 into which the first positioning pin 51b_1 is inserted. Therefore, it is not preferable to interpret such a bottom wall FB as the deepest position of the first positioning portion 13e_1 into which the first imaginary cylinder VC1 is inserted. Therefore, in such a case, it is preferable that the deepest position of the first positioning portion 13e_1 into which the first imaginary cylinder VC1 is inserted is the tip of the first positioning pin 51b_1 (the end of the first positioning pin 51b_1 in the Z1 direction).

[0140] As described above, when the deepest position of the first positioning portion 13e_1 into which the first imaginary cylinder VC1 is inserted is defined, the first region RE1 contacts the first positioning portion 13e_1 on the Y2 side with respect to the first center line LC1 but does not contact the first positioning portion 13e_1 on the Y1 side. The second region RE2 does not contact the first positioning portion 13e_1 on the Y2 side with respect to the first center line LC1 but contacts the first positioning portion 13e_1 on the Y1 side. The third region RE3 does not contact the first positioning portion 13e_1 on either the Y2 side or the Y1 side with respect to the first center line LC1. In this way, the first positioning portion 13e_1 is obtained by forming the bottomed hole 8 to a depth required for inserting the first positioning pin 51b_1. This has the advantage of making it easier to increase the rigidity of the holder 13D.

[0141] In addition, the wall surface of the bottomed hole 8 is provided with a first contact portion CT1 that contacts the first region RE1, a second contact portion CT2 that contacts the second region RE2, a first inclined surface FL1 that is a surface continuous with the first contact portion CT1 and extends in a direction that intersects with the Z-axis without being perpendicular to the direction, and a second inclined surface FL2 that is a surface continuous with the second contact portion CT2 and extends in a direction that intersects with the Z-axis without being perpendicular to the direction.

[0142] According to the fifth embodiment described above, it is also possible to improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51.

[0143] 6. Sixth embodiment The sixth embodiment of the present disclosure will be described below, focusing on the differences from the first embodiment.

[0144] Fig. 34 is a cross-sectional view showing a state in which a first positioning pin 51b_1 is inserted into a first positioning portion 13e_1 of a liquid jet head according to the sixth embodiment. The first positioning portion 13e_1 of this embodiment is configured similarly to the first positioning portion 13e_1 of the first embodiment, except that it is configured with a bottomed hole 8A having a bottom wall FB. Fig. 34 shows a portion of a holder 13D' having a bottomed hole 8A. In Fig. 34, a first imaginary cylinder VC1 is indicated by diamond-shaped hatching.

[0145] The blind hole 8A is formed in a hole forming surface FO facing the protruding surface FP of the support body 51 of the holder 13D. In this embodiment, the bottom wall FB extends along an XY plane perpendicular to the Z axis. The blind hole 8A has a recess formed in the hole forming surface FO, a cylindrical hole recessed down to the bottom wall FB, and a space that is hidden by the hole forming surface FO when the hole forming surface FO is viewed in the Z1 direction. In the direction along the Y axis, the cylindrical hole is located between the recess and the hidden space. Furthermore, when viewed in the direction along the Y axis, the recess and the hidden space have overlapping portions.

[0146] The first region RE1 of the first imaginary cylinder VC1 is in contact with the first contact portion CT1 of the first positioning portion 13e_1 at a portion on the Y2 direction side with respect to the first center line LC1, and is not in contact with the first positioning portion 13e_1 at a portion on the Y1 direction side. The second region RE2 is in contact with the second contact portion CT2 of the first positioning portion 13e_1 at a portion on the Y1 direction side with respect to the first center line LC1, and is not in contact with the first positioning portion 13e_1 at a portion on the Y2 direction side. The third region RE3 is not in contact with the first positioning portion 13e_1 on either the Y2 direction side or the Y1 direction side with respect to the first center line LC1.

[0147] The liquid jet head of this embodiment includes a holder 13D', which is an example of a "first member," and the holder 13D' has a bottomed hole 8A having a bottom wall FB as a first positioning portion 13e_1. The deepest position into which the first imaginary cylinder VC1 can be inserted is the bottom wall FB.

[0148] According to the sixth embodiment described above, it is also possible to improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51.

[0149] Note that the first through hole 2 shown in the first embodiment is a through hole into which the first positioning pin 51b_1 is inserted, and therefore, for example, if a through hole is formed in a position on the bottom wall FB of the bottomed hole 8A where the first positioning pin 51b_1 cannot be inserted, or if a through hole that is too small to insert the first positioning pin 51b_1 is formed in the bottom wall FB, such a through hole is not considered to be part of the first through hole 2. Therefore, if such a through hole different from the first through hole 2 is formed in the bottom wall FB, it is desirable that the deepest position into which the first imaginary cylinder VC1 is inserted be the bottom wall FB.

[0150] 6. Variations The above-described exemplary embodiments can be modified in various ways. Specific modified embodiments that can be applied to the above-described embodiments are exemplified below. Two or more embodiments arbitrarily selected from the following examples can be combined as appropriate to the extent that they are not mutually contradictory.

[0151] 6-1. Variation 1 Fig. 35 is a view of a first positioning portion 13e_1 of a liquid jet head according to Modification 1, viewed in the Z2 direction. Fig. 36 is a cross-sectional view taken along line JJ in Fig. 35. Fig. 37 is a view of the first positioning portion 13e_1 shown in Fig. 35, viewed in the Z1 direction. The first positioning portion 13e_1 of this modification is configured similarly to the first positioning portion 13e_1 of the fourth embodiment, except that it has a first through hole 2E, a first recess 3E, and a second recess 4E instead of the first through hole 2, the first recess 3C, and the second recess 4C. Figs. 35 to 37 show a portion of a holder 13E having a first through hole 2E, a first recess 3E, and a second recess 4E.

[0152] Specifically, this modification differs from the fourth embodiment in that the shape of the second recess 4E is changed so that the first slope FL1 of this modification extends from the connection portion between the first contact portion CT1 and the first slope FL1 to the second surface F2. Similarly, this modification differs from the fourth embodiment in that the shape of the first recess 3E is changed so that the second slope FL2 of this modification extends from the connection portion between the second contact portion CT2 and the second slope FL2 to the first surface F1.

[0153] Here, the length of the first inclined surface FL1 along the first direction (direction along the Z axis) is preferably equal to or greater than the sum of the lengths of the second region RE2 and the third region RE3 along the first direction (direction along the Z axis). In this embodiment, the length of the first inclined surface FL1 along the first direction (direction along the Z axis) is the same as the sum of the lengths of the second region RE2 and the third region RE3 along the first direction (direction along the Z axis). This has the advantage of making it easier to ensure the thickness of the member constituting the first positioning portion 13e_1. Furthermore, the first inclined surface FL1 can be used as a guide for inserting the first positioning pin 51b_1 into the first positioning portion 13e_1, thereby improving the ease of attachment and detachment of the liquid jet head to and from the support 51. Similarly, the length of the second inclined surface FL2 along the first direction (direction along the Z axis) is preferably equal to or greater than the sum of the lengths of the first region RE1 and the third region RE3 along the first direction (direction along the Z axis).

[0154] According to the above-described first modification, it is possible to improve the attachability and detachability while ensuring the required positioning accuracy of the liquid jet head relative to the support body 51. 6-2. Variation 2 Figure 38 is a plan view of a liquid jet head 1G according to Modification Example 2. The liquid jet head 1G is schematically shown in Figure 38. The liquid jet head 1G has the same configuration as the liquid jet head 1 of the above-described first embodiment, except that it has a holder 13G instead of the holder 13.

[0155] The holder 13G has a pair of flange portions 13h that protrude in the Y1 and Y2 directions relative to the ejection surface FN in a plan view. Each of the pair of flange portions 13h extends in a direction along the X axis, and the surface of each of the pair of flange portions 13h facing in the Z2 direction contacts the protruding surface FP, which is the surface of the support body 51 facing in the Z1 direction. Of the pair of flange portions 13h, the flange portion 13h_1 that protrudes in the Y2 direction from the ejection surface FN is provided with a first positioning portion 13e_1 and a second positioning portion 13e_2, while the flange portion 13h_2 that protrudes in the Y1 direction from the ejection surface FN is not provided with the first positioning portion 13e_1 or the second positioning portion 13e_2. Although not shown, the pair of flange portions 13h are appropriately provided with a plurality of holes 13f.

[0156] In the second modification, the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned in the direction along the X-axis. Specifically, the first positioning portion 13e_1 is provided near the end of the flange portion 13h_1 in the X2 direction, and the second positioning portion 13e_2 is provided near the end of the flange portion 13h in the X1 direction. The direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned is perpendicular to the direction along the Z-axis and intersects with (orthogonal to) the direction along the Y-axis. The direction along the X-axis in this modification is an example of a "third direction." The ejection surface FN is elongated in the direction along the X-axis, which is the direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned. Incidentally, for example, if a first positioning portion 13e_1 is provided near the end of flange portion 13h_1 in the X2 direction and a second positioning portion 13e_2 is provided near the end of flange portion 13h_2 in the X1 direction, the direction in which first positioning portion 13e_1 and second positioning portion 13e_2 are aligned is perpendicular to the direction along the Z axis and is a direction that intersects with but is not perpendicular to the direction along the Y axis.

[0157] Here, the first positioning portion 13e_1 and the second positioning portion 13e_2 of Modification 2 will be described. FIG. 39 is a view of the first positioning portion 13e_1 of the liquid jet head 1G according to Modification 2 as viewed in the Z2 direction. FIG. 40 is a cross-sectional view taken along line KK in FIG. 39. FIG. 41 is a view of the second positioning portion 13e_2 of the liquid jet head according to Modification 2 as viewed in the Z2 direction. FIG. 42 is a cross-sectional view taken along line LL in FIG. 41. The first positioning portion 13e_1 of this modification is configured similarly to the first positioning portion 13e_1 of the first embodiment, except that its orientation around the Z axis is different. Furthermore, the second positioning portion 13e_2 of this modification is configured similarly to the second positioning portion 13e_2 of the first embodiment, except that its orientation around the Z axis is different and its lengths in the directions along the X axis and Y axis are different.

[0158] The first positioning portion 13e_1 of Modification 2 is configured similarly to the first positioning portion 13e_1 of the first embodiment rotated 90° counterclockwise around the first center line LC1 as viewed in the Z2 direction. The second positioning portion 13e_2 of Modification 2 is configured similarly to the second positioning portion 13e_2 of the first embodiment rotated 90° counterclockwise around the second center line LC2 as viewed in the Z2 direction and with the longitudinal direction of the second through hole 5 aligned along the X-axis.

[0159] The first positioning portion 13e_1 of the second modification has a first contact portion CT1 that contacts the Y2 side of the first region RE1 with respect to the first center line LC1 and a second contact portion CT2 that contacts the Y1 side of the second region RE2 with respect to the first center line LC1. The first positioning portion 13e_1 does not contact the Y1 side of the first region RE1 with respect to the first center line LC1, does not contact the Y2 side of the second region RE2 with respect to the first center line LC1, and does not contact both the Y1 side and the Y2 side of the third region RE3. Here, the direction along the Y axis is an example of the "second direction," the Y2 side is an example of the "first side" in this modification, and the Y1 side is an example of the "second side" in this modification. The direction along the Z axis is an example of the "first direction."

[0160] The second positioning portion 13e_2 of the second modification has a third contact portion CT3 that contacts the fourth region RE4 on the Y2 side with respect to the second center line LC2 and a fourth contact portion CT4 that contacts the fifth region RE5 on the Y1 side with respect to the second center line LC2. The second positioning portion 13e_2 does not contact the portion of the fourth region RE4 on the Y1 side with respect to the second center line LC2, does not contact the portion of the fifth region RE5 on the Y2 side with respect to the second center line LC2, and does not contact the sixth region RE6 on both the Y1 side and the Y2 side.

[0161] As in the first embodiment, the ejection surface FN of the liquid jet head 1G of this modified example is disposed on the Y1 direction side as viewed from the first positioning portion 13e_1. Furthermore, the second region RE2 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the first region RE1, in relation to the direction along the Z axis. In other words, the second region RE2 is closer to the protruding surface FP than the first region RE1 in relation to the direction along the Z axis. Furthermore, the ejection surface FN is not disposed on the Y2 direction side as viewed from the first positioning portion 13e_1.

[0162] Furthermore, the ejection surface FN of the liquid jet head 1G is disposed on the Y1 direction side as viewed from the second positioning portion 13e_2. Furthermore, the fifth region RE5 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the fourth region RE4, in relation to the direction along the Z axis. In other words, the fifth region RE5 is closer to the protruding surface FP than the fourth region RE4 in relation to the direction along the Z axis. Furthermore, the ejection surface FN is not disposed on the Y2 direction side as viewed from the second positioning portion 13e_2. In other words, the direction from the second region RE2 to the first region RE1 (Z1 direction) is the same as the direction from the fifth region RE5 to the fourth region RE4 (Z1 direction).

[0163] The above-described second modification also makes it possible to improve the ease of attachment and detachment while ensuring the necessary positioning accuracy of the liquid jet head 1G relative to the support body 51. In each of the above-described embodiments, a configuration is exemplified in which the liquid jet head is attached to and detached from the support body 51 by tilting it about an axis along the short direction of the liquid jet head, which has a longitudinal shape in a plan view, but in the second modification, the liquid jet head 1G can be attached to and detached from the support body 51 by tilting it about the X-axis along the longitudinal direction of the liquid jet head 1G.

[0164] 6-3. Variation 3 43 is a plan view of a liquid jet head 1H according to Modification Example 3. The liquid jet head 1H has the same configuration as the liquid jet head 1 according to the first embodiment described above, except that it has a holder 13H instead of the holder 13.

[0165] In a plan view, the holder 13H has a pair of flange portions 13h that protrude in the X1 and X2 directions relative to the ejection surface FN near the Y2-direction ends of the ejection surface FN. The surfaces of each of the pair of flange portions 13h facing the Z2 direction are in contact with the protruding surface FP, which is the surface of the support body 51 facing the Z1 direction. Of the pair of flange portions 13h, the flange portion 13h that protrudes in the X2 direction relative to the ejection surface FN is provided with a first positioning portion 13e_1, and the flange portion 13h that protrudes in the X1 direction relative to the ejection surface FN is provided with a second positioning portion 13e_2. Although not shown, the pair of flange portions 13h are appropriately provided with a plurality of holes 13f.

[0166] In Modification 3, the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned in a direction along the X-axis. The direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned is a direction that is perpendicular to the direction along the Z-axis and intersects with (orthogonal to) the direction along the Y-axis. The direction along the X-axis in this modification is an example of a "third direction." Furthermore, the ejection surface FN is elongated in the direction along the X-axis, which is the direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are aligned.

[0167] Here, the first positioning portion 13e_1 of Modification 3 is configured similarly to the first positioning portion 13e_1 of Modification 2 described above. Furthermore, the second positioning portion 13e_2 of Modification 3 is configured similarly to the second positioning portion 13e_2 of Modification 2 described above. That is, the first positioning portion 13e_1 of this modification is the same as the first positioning portion 13e_1 of Modification 2 shown in FIGS. 39 and 40, except for the difference in the position of the first positioning portion 13e_1 relative to the ejection surface FN. Specifically, the first region RE1, the third region RE3, and the second region RE2 of this modification are aligned in this order in the Z2 direction, and the first contact portion CT1 is positioned in the Y2 direction relative to the second contact portion CT2. Furthermore, the second positioning portion 13e_2 of this modification is the same as the second positioning portion 13e_2 of Modification 2 shown in FIGS. 41 and 42, except for the difference in the position of the second positioning portion 13e_2 relative to the ejection surface FN. Specifically, the fourth region RE4, sixth region RE6, and fifth region RE5 of this modification are arranged in this order in the Z2 direction, and the third contact portion CT3 is located in the Y2 direction relative to the fourth contact portion CT4.

[0168] The liquid jet head 1H of this modification differs from Modification 2 in that the ejection surface FN is disposed on the X1 direction side as viewed from the first positioning portion 13e_1 and on the X2 direction side as viewed from the second positioning portion 13e_2. The second region RE2 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the first region RE1 in the direction along the Z axis, and the fifth region RE5 is disposed in the Z2 direction, which is the direction in which the ejection surface FN faces relative to the fourth region RE4 in the direction along the Z axis. In other words, the second region RE2 is closer to the protruding surface FP than the first region RE1 in the direction along the Z axis, and the fifth region RE5 is closer to the protruding surface FP than the fourth region RE4 in the direction along the Z axis. In other words, the direction from the second region RE2 to the first region RE1 (Z1 direction) is the same as the direction from the fifth region RE5 to the fourth region RE4 (Z1 direction). The positions on the Y axis of the first positioning portion 13e_1 and the second positioning portion 13e_2 are located in the Y2 direction from the center of the ejection surface FN in the direction along the Y axis, and specifically, are at the same positions as the ends of the ejection surface FN in the Y2 direction. Note that the ejection surface FN is not positioned on the Y1 direction side or the Y2 direction side as viewed from the first positioning portion 13e_1, and the ejection surface FN is not positioned on the Y1 direction side or the Y2 direction side as viewed from the second positioning portion 13e_2.

[0169] According to the third modification described above, it is also possible to improve the attachability and detachability of the liquid jet head 1H relative to the support body 51 while ensuring the required positioning accuracy of the liquid jet head 1H relative to the support body 51.

[0170] 6-4. Variation 4 44 is a schematic diagram for explaining attachment and detachment of a liquid jet head 1I to and from a support body 51I according to Modification 4. In each of the above-described embodiments, a configuration is exemplified in which the first positioning pin 51b_1 and the second positioning pin 51b_2 are provided on the protruding surface FP, which is the surface of the support body 51 that faces in the opposite direction (Z1 direction) to the direction in which the ejection surface FN faces (Z2 direction). However, in Modification 4, the first positioning pin 51b_1 and the second positioning pin 51b_2 are provided on the surface of the support body 51I that faces in the same direction as the direction in which the ejection surface FN faces. The liquid jet head 1I is attached to the support body 51I so that the surface opposite to the ejection surface FN is inserted into the opening 51a of the support body 51I.

[0171] FIG. 45 is a cross-sectional view of a first positioning portion 13e_1 according to Modification 4, corresponding to FIG. 11 of the first embodiment. FIG. 46 is a cross-sectional view of a second positioning portion 13e_2 according to Modification 4, corresponding to FIG. 19 of the first embodiment. A first positioning portion 13e_1 and a second positioning portion 13e_2 are provided on the flange portion 13h of the holder 13I of the liquid jet head 1I according to Modification 4. A first surface F1 of the flange portion 13h according to this modification faces the Z2 direction, the same as the ejection surface FN. A second surface F2 of the flange portion 13h faces the Z1 direction, which is the opposite direction to the ejection surface FN. The second surface F2 faces the protruding surface FP of the support body 51I.

[0172] Although details will be described later, the first positioning portion 13e_1 of Modification 4 has the same configuration as the first positioning portion 13e_1 of the first embodiment, except that the second region RE2, the third region RE3, and the first region RE1 are arranged in this order in the direction in which the ejection surface FN faces (the Z2 direction). The second positioning portion 13e_2 of Modification 4 also has the same configuration as the second positioning portion 13e_2 of the first embodiment, except that the fifth region RE5, the sixth region RE6, and the fourth region RE4 are arranged in this order in the direction in which the ejection surface FN faces (the Z2 direction).

[0173] The first positioning portion 13e_1 has a first through hole 2I penetrating the flange portion 13h in the direction along the Z axis, a first recess 3I formed in the first surface F1, and a second recess 4I formed in the second surface F2. The second recess 4I, the first through hole 2I, and the first recess 3I are aligned in this order in the Y1 direction. The side surface of a first imaginary cylinder VC1 set in the first positioning portion 13e_1 of this modification includes three regions divided in the first direction (the direction along the Z axis): a first region RE1, a second region RE2, and a third region RE3 disposed between the first region RE1 and the second region RE2. The second region RE2, the third region RE3, and the first region RE1 are aligned in this order in the direction in which the ejection surface FN faces (the Z2 direction). Although not shown, the shape of the first imaginary cylinder VC1 in a plan view is a perfect circle, as in the first embodiment.

[0174] The first region RE1 contacts the first contact portion CT1 of the first positioning portion 13e_1 at a portion on the first side (Y2 direction side) in the second direction (direction along the Y axis) relative to the first center line LC1, but does not contact the first positioning portion 13e_1 at a portion on the second side (Y1 direction side) in the second direction (direction along the Y axis) relative to the first center line LC1. The second region RE2 contacts the second contact portion CT2 of the first positioning portion 13e_1 at a portion on the second side (Y1 direction side) in the second direction (direction along the Y axis) relative to the first center line LC1, but does not contact the first positioning portion 13e_1 at a portion on the first side (Y2 direction side) in the second direction (direction along the Y axis) relative to the first center line LC1. The third region RE3 does not contact the first positioning portion 13e_1 at both the second side (Y1 direction side) and the first side (Y2 direction side) relative to the first center line LC1.

[0175] The second positioning portion 13e_2 has a second through hole 5I penetrating the flange portion 13h in the direction along the Z axis, a third recess 6I formed in the first surface F1, and a fourth recess 7I formed in the second surface F2. The fourth recess 7I, the second through hole 5I, and the third recess 6I are aligned in this order in the Y1 direction. The side surface of the second imaginary cylinder VC2 set in the second positioning portion 13e_2 of this modification includes three regions divided in the first direction (the direction along the Z axis): a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth region RE4 and the fifth region RE5. The fifth region RE5, the sixth region RE6, and the fourth region RE4 are aligned in this order in the direction in which the ejection surface FN faces (the Z2 direction). Although not shown, similarly to the first embodiment, the shape of the second imaginary cylinder VC2 in plan view is an ellipse with the longitudinal direction along the Y axis.

[0176] The fourth region RE4 contacts the third contact portion CT3 of the second positioning portion 13e_2 at a portion on a first side (Y2 direction side) with respect to the second center line LC2, and does not contact the second positioning portion 13e_2 at a portion on a second side (Y1 direction side) with respect to the second center line LC2. The fifth region RE5 contacts the fourth contact portion CT4 of the second positioning portion 13e_2 at a portion on a second side (Y1 direction side) with respect to the second center line LC2, and does not contact the second positioning portion 13e_2 at a portion on a first side (Y2 direction side) with respect to the second center line LC2. The sixth region RE6 does not contact the second positioning portion 13e_2 at both a portion on the second side (Y1 direction side) and a portion on the first side (Y2 direction side) with respect to the second center line LC2.

[0177] Here, as shown in FIG. 44, the ejection surface FN is disposed on the second side (Y1 direction side) as viewed from the first positioning portion 13e_1. The first region RE1 is disposed in the direction (Z2 direction) in which the ejection surface FN faces relative to the second region RE2 in the first direction (direction along the Z axis). In other words, the second region RE2 is disposed closer to the protruding surface FP of the support body 51I than the first region RE1 in the first direction (direction along the Z axis). Similarly, the ejection surface FN is disposed on the first side (Y2 direction side) as viewed from the second positioning portion 13e_2, and the fourth region RE4 is disposed in the direction (Z2 direction) in which the ejection surface FN faces relative to the fifth region RE5 in the first direction (direction along the Z axis). In other words, the fifth region RE5 is disposed closer to the protruding surface FP of the support body 51I than the fourth region RE4 in the first direction (direction along the Z axis). According to the fifth modification example described above, it is also possible to improve the ease of attachment and detachment while ensuring the necessary positioning accuracy of the liquid jet head 1I relative to the support body 51I.

[0178] 6-5. Variation 5 47 is a schematic diagram for explaining attachment and detachment of a liquid jet head 1J according to Modification 5 to and from a support body 51J. The liquid jet head 1J is configured similarly to the liquid jet head 1 of the first embodiment, except that it has a first positioning pin 13g_1 and a second positioning pin 13g_2 instead of the first positioning pin 13e_1 and the second positioning pin 13e_2. The support body 51J is configured similarly to the support body 51 of the first embodiment, except that it has a first positioning portion 51d_1 and a second positioning portion 51d_2 instead of the first positioning pin 51b_1 and the second positioning pin 51b_2.

[0179] The X-axis, Y-axis, and Z-axis in Modification 5 are coordinate axes of a local coordinate system based on the support body 51J arranged three-dimensionally. Therefore, Fig. 47 shows the coordinate axes of the local coordinate system based on the support body 51J in a state in which the liquid jet head 1J is supported by the support body 51J. Note that there may be cases in which the liquid jet head 1J, which has a configuration other than that of the support body 51J, is described using the local coordinate system based on the support body 51J in a state in which the liquid jet head 1J is supported by the support body 51J.

[0180] The first positioning pin 13g_1 and the second positioning pin 13g_2 are configured similarly to the first positioning pin 51b_1 and the second positioning pin 51b_2. However, each of the first positioning pin 13g_1 and the second positioning pin 13g_2 protrudes in the Z2 direction from a protruding surface FP. The protruding surface FP is a surface facing the Z2 direction, which is the same direction as the ejection surface FN of the holder 13J.

[0181] The first positioning portion 51d_1 and the second positioning portion 51d_2 are configured similarly to the first positioning portion 13e_1 and the second positioning portion 13e_2. A first positioning pin 13g_1 is inserted into the first positioning portion 51d_1 in the Z2 direction relative to the support body 51J. Furthermore, a second positioning pin 13g_2 is inserted into the second positioning portion 51d_2 in the Z2 direction relative to the support body 51J.

[0182] Fig. 48 is a cross-sectional view of a first positioning portion 51d_1 according to Modification 5, and corresponds to Fig. 11 of the first embodiment. Fig. 49 is a cross-sectional view of a second positioning portion 51d_2 according to Modification 5, and corresponds to Fig. 19 of the first embodiment. The support body 51J has a first surface F1 that faces in the Z2 direction, the same as the ejection surface FN, and a second surface F2 that faces in the Z1 direction and is on the opposite side of the first surface F1. The second surface F2 of the support body 51J faces the protruding surface FP of the liquid jet head 1J, and the two surfaces are in contact with each other.

[0183] The first positioning portion 51d_1 has a first through-hole 2J that penetrates the support body 51J in the direction along the Z-axis, a first recess 3J formed in a first surface F1 of the support body 51J, and a second recess 4J formed in a second surface F2 of the support body 51J. The second recess 4J, the first through-hole 2J, and the first recess 3J are aligned in this order in the Y1 direction.

[0184] The second positioning portion 51d_2 has a second through-hole 5J penetrating the support body 51J in the direction along the Z-axis, a third recess 6J formed in the first surface F1 of the support body 51J, and a fourth recess 7J formed in the second surface F2 of the support body 51J. The fourth recess 7J, the second through-hole 5J, and the third recess 6J are aligned in this order in the Y1 direction.

[0185] Here, the side surface of the first imaginary cylinder VC1 set in the first positioning portion 51d_1 includes three regions divided in a first direction (direction along the Z axis): a first region RE1, a second region RE2, and a third region RE3 disposed between the first region RE1 and the second region RE2. The first region RE1 contacts the first positioning portion 51d_1 on a first side (Y2 direction side) that is one side in a second direction (direction along the Y axis) that is orthogonal to the first direction (direction along the Z axis) with respect to a first center line LC1 that is the center line of the first imaginary cylinder VC1, and does not contact the first positioning portion 51d_1 on a second side (Y1 direction side) that is the other side in the second direction (direction along the Y axis). The second region RE2 does not contact the first positioning portion 51d_1 on a first side (Y2 direction side) with respect to the first center line LC1, but contacts the first positioning portion 51d_1 on a second side (Y1 direction side). The third region RE3 does not contact the first positioning portion 51d_1 on either the first side (Y2 direction side) or the second side (Y1 direction side) with respect to the first center line LC1. Although not shown, the shape of the first imaginary cylinder VC1 in a plan view is a perfect circle, similar to the first embodiment.

[0186] The side surface of the second imaginary cylinder VC2 set on the second positioning portion 51d_2 includes three regions divided in the first direction (the direction along the Z axis): a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth region RE4 and the fifth region RE5. The fourth region RE4 contacts the second positioning portion 51d_2 on the Y2 side with respect to a second center line LC2, which is the center line of the second imaginary cylinder VC2, but does not contact the second positioning portion 51d_2 on the Y1 side. The fifth region RE5 does not contact the second positioning portion 51d_2 on the Y2 side with respect to the second center line LC2, but contacts the second positioning portion 51d_2 on the Y1 side. The sixth region RE6 does not contact the second positioning portion 51d_2 on either the Y2 side or the Y1 side with respect to the second center line LC2. Although not shown, similarly to the first embodiment, the shape of the second imaginary cylinder VC2 in plan view is an ellipse with the longitudinal direction along the Y axis.

[0187] The support body 51J also has an opening 51a into which a portion of the liquid jet head 1J is inserted. In this modified example, a portion of the liquid jet head 1J, including the ejection surface FN, is inserted into the opening 51a. The opening 51a is disposed on the second side (Y1 direction side) as viewed from the first positioning portion 51d_1. Note that, when multiple liquid jet heads 1J are inserted into one opening 51a as in the first embodiment, the "opening 51a" described here refers only to the space of the opening 51a into which one liquid jet head 1J is inserted. In other words, the opening 51a corresponding to the liquid jet head 1J is not disposed on the first side (Y2 direction side) as viewed from the first positioning portion 51d_1. The second region RE2 is disposed closer to the protruding surface FP, from which the first positioning pin 13g_1 of the liquid jet head 1J protrudes, than the first region RE1, in terms of the first direction (the direction along the Z axis).

[0188] Similarly, the opening 51a is disposed on the first side (Y2 direction side) as viewed from the second positioning portion 51d_2. To reiterate, when a plurality of liquid jet heads 1J are inserted into one opening 51a, the "opening 51a" described here refers only to the space of the openings 51a into which one of the liquid jet heads 1J is inserted. In other words, the opening 51a corresponding to the liquid jet head 1J is not disposed on the second side (Y1 direction side) as viewed from the second positioning portion 51d_2. The fifth region RE5 is disposed closer to the protruding surface FP of the liquid jet head 1J than the fourth region RE4 in the first direction (direction along the Z axis). In other words, the direction from the first region RE1 to the second region RE2 (Z1 direction) is the same as the direction from the fourth region RE4 to the fifth region RE5 (Z1 direction).

[0189] The first positioning portion 51d_1 may have a first inclined surface FL1 and a second inclined surface FL2, similar to the first positioning portion 13e_1 in the fourth embodiment, the fifth embodiment, or the first modification. In this case, the first positioning portion 51d_1 includes a first contact portion CT1 that contacts a portion of the first region RE1 on a first side (Y2 direction side) with respect to the first center line LC1, and a first inclined surface FL1 that is a surface continuous with the first contact portion CT1 and extends in a direction intersecting but not orthogonal to the first direction (direction along the Z axis). Furthermore, the first positioning portion 51d_1 includes a second contact portion CT2 that contacts a portion of the second region RE2 on a second side (Y1 direction side) with respect to the first center line LC1, and a second inclined surface FL2 that is a surface continuous with the second contact portion CT2 and extends in a direction intersecting but not orthogonal to the first direction (direction along the Z axis).

[0190] Similarly, the second positioning portion 51d_2 may have a third inclined surface FL3 and a fourth inclined surface FL4, similar to the second positioning portion 13e_2 of the above-described fourth embodiment. In this case, the second positioning portion 51d_2 includes: a third contact portion CT3 that contacts a portion of the first region RE1 on the first side (Y2 direction side) with respect to the second center line LC2; a fourth contact portion CT4 that contacts a portion of the fifth region RE5 on the second side (Y1 direction side) with respect to the second center line LC2; the third inclined surface FL3 that is a surface continuous with the third contact portion CT3 and extends in a direction that intersects but is not orthogonal to the first direction (direction along the Z axis); and the fourth inclined surface FL4 that is a surface continuous with the fourth contact portion CT4 and extends in a direction that intersects but is not orthogonal to the first direction (direction along the Z axis).

[0191] As described above, the support body 51J includes the second positioning portion 51d_2 that positions the liquid jet head 1J by being inserted into the second positioning pin 13g_2 provided on the liquid jet head 1J. The first positioning portion 51d_1 and the second positioning portion 51d_2 are arranged side by side in the second direction (the direction along the Y-axis). Specifically, the second positioning portion 51d_2 is arranged in the Y1 direction with respect to the first positioning portion 51d_1.

[0192] The liquid ejecting apparatus including the support body 51J and the liquid ejecting head 1J according to the fifth modification example described above can also improve the ease of attachment and detachment while ensuring the required positioning accuracy of the liquid ejecting head 1J relative to the support body 51J.

[0193] It should be noted that all or part of the above-described embodiments and modifications, and combinations thereof, may be applied to the support body 51J of this modification to the extent that no contradictions arise.

[0194] 6-6. Variation 6 In the above-described embodiments and modified examples, the positioning pin is press-fit into the positioning portion. However, this is not limited to this. The liquid jet head may be positioned relative to the support by inserting the positioning pin into the positioning portion using a clearance fit. Here, "loose fit" of the positioning pin into the positioning portion refers to a state in which the maximum length of the positioning pin, as viewed in the depth direction of the positioning portion, is less than the diameter of a cross section perpendicular to the depth direction of an imaginary regular circular cylinder inserted to the deepest position of the positioning portion and having the largest cross-sectional area as viewed in the depth direction of the positioning portion. In other words, the positioning pin may not contact the positioning portion or may contact the positioning portion at only one point. Even with such an insertion method, the configuration of the positioning portion shown in each embodiment and example can improve the ease of attachment and detachment of the liquid jet head to the support.

[0195] 6-7. Variation 7 In the above-described embodiments and modified examples, a so-called serial printer is used, in which a printing operation is performed by ejecting ink from a liquid ejection head while a carriage including a support moves back and forth in a direction perpendicular to the transport direction DM of the medium M. However, the present invention is not limited to this. For example, the present invention may be a line printer equipped with a line head in which a printing area is larger than the width of the medium M in the direction perpendicular to the transport direction DM by arranging multiple liquid ejection heads in a direction perpendicular to the transport direction DM of the medium M. In other words, the support may be a print bar that supports multiple liquid ejection heads to form a line head.

[0196] 6-8. Variation 8 The liquid ejection apparatus exemplified in the above-described embodiment can be employed in various devices such as facsimile machines and copiers, in addition to devices dedicated to printing. However, the uses of the liquid ejection apparatus are not limited to printing. For example, a liquid ejection apparatus that ejects a solution of a coloring material is used as a manufacturing apparatus for forming color filters for display devices such as liquid crystal display panels. Furthermore, a liquid ejection apparatus that ejects a solution of a conductive material is used as a manufacturing apparatus for forming wiring and electrodes on a wiring board. Furthermore, a liquid ejection apparatus that ejects a solution of an organic substance related to a living body is used as a manufacturing apparatus for manufacturing biochips, for example. [Explanation of symbols]

[0197] 1...liquid jet head, 1G...liquid jet head, 1H...liquid jet head, 1I...liquid jet head, 1J...liquid jet head, 2...first through hole, 2A...first through hole, 2B...first through hole, 2E...first through hole, 3...first recess, 3A...first recess, 3B...first recess, 3C...first recess, 3E...first recess, 4...second recess, 4A...second recess, 4B...second recess, 4C...second recess, 4E...second recess, 5...second through hole, 6...third recess, 6C...third recess, 7... Fourth recess, 7C...fourth recess, 8...bottomed hole, 10...liquid container, 13...holder, 13A...holder, 13B...holder, 13C...holder, 13D...holder, 13E...holder, 13G...holder, 13H...holder, 13e...positioning portion, 13e_1...first positioning portion, 13e_2...second positioning portion, 13g_1...first positioning pin, 13g_2...second positioning pin, 14...fixing plate, 14a...opening, 20...control unit, 3 0...transport mechanism, 40...movement mechanism, 41...transport body, 42...transport belt, 50...head module, 51...support, 51I...support, 51J...support, 51a...opening, 51b...positioning pin, 51b_1...first positioning pin, 51b_2...second positioning pin, 51d_1...first positioning portion, 51d_2...second positioning portion, 60...circulation mechanism, 100...liquid ejection device, CT1...first contact portion, CT2...second contact portion, CT3...third contact portion, CT4...fourth contact portion, DM...conveying direction, F1...first surface, F2...second surface, FB...bottom wall, FL1...first inclined surface, FL2...second inclined surface, FN...ejection surface, FP...protruding surface, HC...head tip, LC1...first center line, LC2...second center line, LL...axis, M...medium, N...nozzle, RE1...first region, RE2...second region, RE3...third region, RE4...fourth region, RE5...fifth region, RE6...sixth region, VC1...first imaginary cylinder, VC2...second imaginary cylinder.

Claims

1. A liquid ejection head that is supported by a support having a first positioning pin and ejects liquid, a first positioning portion into which the first positioning pin is inserted to position the liquid ejection head relative to the support; When a virtual cylinder that is inserted to the deepest position of the first positioning portion and has a maximum cross-sectional area when viewed in a first direction that is a depth direction of the first positioning portion is defined as a first virtual cylinder, a side surface of the first virtual cylinder includes three regions divided in the first direction, the three regions being a first region, a second region, and a third region disposed between the first region and the second region, the first region contacts the first positioning portion on a first side that is one side in a second direction perpendicular to the first direction with respect to a first center line that is a center line of the first imaginary cylinder, and does not contact the first positioning portion on a second side that is the other side in the second direction, the second region does not contact the first positioning portion on the first side with respect to the first center line and contacts the first positioning portion on the second side, the third region does not contact the first positioning portion on either the first side or the second side with respect to the first center line; A liquid jet head comprising:

2. a first member having the first positioning portion; The first member has a first surface and a second surface opposite to the first surface, The first positioning portion is a first through hole penetrating in the first direction from the second surface to the first surface; a first recess provided on the first surface; a second recess provided on the second surface, the first through hole is disposed between the first recess and the second recess in the second direction; The first imaginary cylinder extends from the first surface to the second surface along the first through hole. The liquid jet head according to claim 1 .

3. a first member having a bottomed hole having a bottom wall as the first positioning portion, The deepest point is the bottom wall. The liquid jet head according to claim 1 .

4. A length of the first region along the first direction and a length of the second region along the first direction are equal to each other. The liquid jet head according to claim 1 .

5. a length of each of the first region and the second region along the first direction is 20% or more and 45% or less of a length of the first virtual cylinder along the first direction; The liquid jet head according to claim 1 .

6. The first positioning portion is a first contact portion that contacts the first side of the first region with respect to the first center line; a second contact portion that contacts the second side of the second region with respect to the first center line, Each of the first contact portion and the second contact portion extends continuously in the first direction. The liquid jet head according to claim 1 .

7. a jet surface having a plurality of nozzles for jetting liquid; the ejection surface is disposed on the second side as viewed from the first positioning portion, The second region is disposed in a direction in which the ejection surface faces the first region with respect to the first direction. The liquid jet head according to claim 1 .

8. a jet surface having a plurality of nozzles for jetting liquid; the ejection surface is disposed on the second side as viewed from the first positioning portion, The first region is disposed in a direction in which the ejection surface faces the second region with respect to the first direction. The liquid jet head according to claim 1 .

9. The first positioning portion is a first contact portion that contacts the first side of the first region with respect to the first center line; a first inclined surface that is a surface continuous with the first contact portion and extends in a direction intersecting the first direction without being perpendicular to the first direction; The liquid jet head according to claim 1 .

10. a length of the first inclined surface along the first direction is equal to or greater than a sum of lengths of the second region and the third region along the first direction; The liquid jet head according to claim 9 .

11. The first positioning portion is a second contact portion that contacts the second side of the second region with respect to the first center line; a second inclined surface that is a surface continuous with the second contact portion and extends in a direction intersecting the first direction without being perpendicular to the first direction, The first inclined surface and the second inclined surface are parallel to each other. The liquid jet head according to claim 9 or 10.

12. the first inclined surface and the second inclined surface have portions that overlap with each other when viewed in the second direction; The liquid jet head according to claim 11 .

13. the first positioning portion has a second contact portion that contacts the second side of the second region with respect to the first center line, Among positions in a third direction perpendicular to the first direction and the second direction, at a position where a length of the first virtual cylinder along the second direction is maximum as viewed in the first direction, in a cross section obtained by cutting the first positioning portion with a plane parallel to both the first direction and the second direction, an angle formed between the first inclined surface and a line segment connecting the first contact portion and the second contact portion at the shortest distance is 90 degrees or more; The liquid jet head according to claim 9 .

14. a second positioning portion into which a second positioning pin provided on the support is inserted to position the liquid ejection head with respect to the support, The first positioning portion and the second positioning portion are arranged side by side in the second direction. The liquid jet head according to claim 1 .

15. the second positioning portion is disposed on the second side with respect to the first positioning portion, The second region is disposed closer to a protruding surface of the support body from which the first positioning pin protrudes than the first region in the first direction. The liquid jet head according to claim 14 .

16. When the second positioning portion is inserted to its deepest position and the cross-sectional area of ​​the second positioning portion is maximized as viewed in the first direction, the second virtual cylinder is defined as a virtual cylinder. a side surface of the second virtual cylinder includes three regions divided in the first direction, the three regions being a fourth region, a fifth region, and a sixth region disposed between the fourth region and the fifth region, the fourth region contacts the second positioning portion on the first side with respect to a second center line that is a center line of the second imaginary cylinder, and does not contact the second positioning portion on the second side, the fifth region does not contact the second positioning portion on the first side with respect to the second center line and contacts the second positioning portion on the second side, the sixth region does not contact the second positioning portion on either the first side or the second side with respect to the second center line, A direction from the second region to the first region is the same as a direction from the fifth region to the fourth region.

16. The liquid jet head according to claim 14,

17. a second positioning portion that is inserted into a second positioning pin provided on the support to position the liquid ejection head with respect to the support, the first positioning portion and the second positioning portion are arranged side by side in a third direction that is perpendicular to the first direction and intersects with the second direction, When the second positioning portion is inserted to its deepest position and the cross-sectional area of ​​the second positioning portion is maximized as viewed in the first direction, the second virtual cylinder is defined as a virtual cylinder. a side surface of the second virtual cylinder includes three regions divided in the first direction, the three regions being a fourth region, a fifth region, and a sixth region disposed between the fourth region and the fifth region, the fourth region contacts the second positioning portion on the first side with respect to a second center line that is a center line of the second imaginary cylinder, and does not contact the second positioning portion on the second side, the fifth region does not contact the second positioning portion on the first side with respect to the second center line and contacts the second positioning portion on the second side, the sixth region does not contact the second positioning portion on either the first side or the second side with respect to the second center line, A direction from the second region to the first region is the same as a direction from the fifth region to the fourth region. The liquid jet head according to claim 1 .

18. A liquid ejection head that is supported by a support having a first positioning pin and ejects liquid, a first member having a first positioning portion into which the first positioning pin is inserted to position the liquid ejection head with respect to the support; The first member has a first surface and a second surface opposite to the first surface, The first positioning portion is a first through hole penetrating in a first direction from the second surface to the first surface; a first recess provided on the first surface; a second recess provided on the second surface, the first through hole is disposed between the first recess and the second recess in a second direction perpendicular to the first direction; A portion of the first recess and a portion of the second recess overlap each other when viewed in the second direction. A liquid jet head comprising:

19. The liquid jet head according to claim 1 , A support body including the first positioning pin; Equipped with A liquid ejection apparatus comprising:

20. The first positioning portion is a first contact portion that contacts the first side of the first region with respect to the first center line; a second contact portion that contacts the second side of the second region with respect to the first center line, Among positions in a third direction perpendicular to the first direction and the second direction, a position where a length of the first virtual cylinder along the second direction is maximum as viewed in the first direction, in a cross section obtained by cutting the first positioning portion with a plane along both the first direction and the second direction, A minimum distance between the first contact portion and the second contact portion is equal to or greater than a maximum length of the first positioning pin along the second direction. The liquid ejection apparatus according to claim 19 .

21. A support for supporting a liquid ejection head that ejects liquid, a first positioning portion into which a first positioning pin provided on the liquid ejection head is inserted to position the liquid ejection head with respect to the support; When a virtual cylinder is inserted to the deepest position of the first positioning portion and has a maximum cross-sectional area when viewed in a first direction that is a depth direction of the first positioning portion, the virtual cylinder is defined as a first virtual cylinder. a side surface of the first virtual cylinder includes three regions divided in the first direction, the three regions being a first region, a second region, and a third region disposed between the first region and the second region, the first region contacts the first positioning portion on a first side that is one side in a second direction perpendicular to the first direction with respect to a first center line that is a center line of the first imaginary cylinder, and does not contact the first positioning portion on a second side that is the other side in the second direction, the second region does not contact the first positioning portion on the first side with respect to the first center line and contacts the first positioning portion on the second side, the third region does not contact the first positioning portion on either the first side or the second side with respect to the first center line; A support comprising:

22. an opening into which a part of the liquid jet head is inserted; The opening is disposed on the second side as viewed from the first positioning portion.

22. The support according to claim 21 .

23. The first positioning portion is a first contact portion that contacts the first side of the first region with respect to the first center line; a first inclined surface that is a surface continuous with the first contact portion and extends in a direction intersecting the first direction without being perpendicular to the first direction; 23. A support according to claim 21 or 22.

24. a second positioning portion that is inserted into a second positioning pin provided on the liquid ejection head to position the liquid ejection head with respect to the support body, The first positioning portion and the second positioning portion are arranged side by side in the second direction.

24. A support according to any one of claims 21 to 23.

25. A support for supporting a liquid ejection head that ejects liquid, a first positioning portion into which a first positioning pin provided on the liquid jet head is inserted to position the liquid jet head with respect to the support body, a first surface, and a second surface opposite to the first surface; The first positioning portion is a first through hole penetrating in a first direction from the second surface to the first surface; a first recess provided on the first surface; a second recess provided on the second surface, the first through hole is disposed between the first recess and the second recess in a second direction perpendicular to the first direction; A portion of the first recess and a portion of the second recess overlap each other when viewed in the second direction. A support comprising:

26. A support according to any one of claims 21 to 25, a liquid ejection head including the first positioning pin; A liquid ejection apparatus comprising:

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