Liquid ejecting head, support body, and liquid ejecting apparatus

Abstract

The present application provides a kind of liquid injection head, support body and liquid injection device.Liquid injection head has the first positioning part for the first positioning pin of support body insertion, when the imaginary cylinder that the insertion to the deepest position of first positioning part and the cross-sectional area becomes maximum when observed along the depth direction of first positioning part, i.e., first direction, is set as first imaginary cylinder, the side surface of first imaginary cylinder includes first area, second area and third area between them as three areas divided out in first direction, first area is in contact with first positioning part on the side of second direction, i.e., first side, relative to the first center line of first imaginary cylinder, which is orthogonal to first direction, and is not in contact with first positioning part on the other side of second direction, i.e., second side, second area is not in contact with first positioning part on first side, relative to first center line, and is in contact with first positioning part on second side, third area is not in contact with first positioning part on both first side and second side, relative to first center line.

Description

Technical Field

[0001] This disclosure relates to a liquid injection head, a support, and a liquid injection device. Background Technology

[0002] Traditionally, liquid ejection devices, such as inkjet printers, have typically been equipped with liquid ejection heads that eject liquids such as ink as droplets.

[0003] For example, Patent Document 1 discloses a technology in which a head (liquid jet head) having a positioning pin component (positioning pin) and an array base component (support body) having a positioning hole (positioning part) are provided, and the head is positioned relative to the array base component by inserting the positioning pin component into the positioning hole.

[0004] As shown in Patent Document 1, in a structure in which the liquid jet head is positioned relative to the support body by inserting a positioning pin into the positioning part, it is desirable to make the liquid jet head easy to assemble and disassemble relative to the support body.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-23378 Summary of the Invention

[0006] To address the above-mentioned issues, the preferred embodiment of this disclosure relates to a liquid injection head that is supported by a support body having a first positioning pin and used for spraying liquid. The liquid injection head includes a first positioning portion, which positions the liquid injection head relative to the support body by inserting the first positioning pin. When a first imaginary cylinder is defined as a cylinder whose cross-sectional area is maximized when viewed along the depth direction of the first positioning portion (i.e., a first direction), the side surface of the first imaginary cylinder comprises three regions divided in the first direction: 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 (a side of a second direction orthogonal to the first direction) relative to a first centerline (which is the centerline of the first imaginary cylinder), but does not contact the first positioning portion on a second side (the other side of the second direction). The second region does not contact the first positioning portion on the first side relative to the first centerline, but 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 relative to the first centerline.

[0007] The preferred embodiment of this disclosure involves a support body that supports a liquid injection head for spraying liquid and includes a first positioning part. The first positioning part positions the liquid injection head relative to the support body by inserting a first positioning pin disposed on the liquid injection head. When a first imaginary cylinder is defined as an imaginary cylinder that is inserted to the deepest position of the first positioning part and has the largest cross-sectional area when viewed along the depth direction of the first positioning part, i.e., the first direction, the side of the first imaginary cylinder includes a first region, a second region, and a third region disposed between the first region and the second region, which are divided into three regions in the first direction. The first region contacts the first positioning part on a first side, which is a second direction orthogonal to the first direction, relative to a first centerline that is the centerline of the first imaginary cylinder, but does not contact the first positioning part on a second side, which is the other side of the second direction. The second region does not contact the first positioning part on the first side, but contacts the first positioning part on the second side, relative to the first centerline. The third region does not contact the first positioning part on both the first side and the second side, relative to the first centerline.

[0008] The liquid injection device according to the preferred embodiment of this disclosure includes: a liquid injection head as described above; and a support having the first locating pin.

[0009] The liquid injection device according to the preferred embodiment of this disclosure includes: a support body as described above; and a liquid injection head having the first positioning pin. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating a structural example of the liquid injection device according to the first embodiment.

[0011] Figure 2 This is a perspective view of a head module having the liquid injection head according to the first embodiment.

[0012] Figure 3 This is an exploded perspective view of the liquid injection head according to the first embodiment.

[0013] Figure 4 This is a plan view of the liquid injection head according to the first embodiment.

[0014] Figure 5 This is a perspective view of the support body according to the first embodiment.

[0015] Figure 6 This is a plan view of the liquid injection head according to the first embodiment.

[0016] Figure 7Observed along the Z2 direction Figure 6 A diagram of the first positioning part of the liquid injection head.

[0017] Figure 8 for Figure 7 Sectional view along line AA in the diagram.

[0018] Figure 9 Observed along the Z1 direction Figure 7 The diagram shows the first positioning part.

[0019] Figure 10 For use in setting Figure 7 A plan view illustrating the first imaginary cylinder in the first positioning part.

[0020] Figure 11 For use in setting Figure 7 A cross-sectional view illustrating the first imaginary cylinder in the first positioning part.

[0021] Figure 12 To indicate that the first locating pin of the support body is inserted into Figure 7 A diagram showing the state of the first positioning section.

[0022] Figure 13 To indicate that Figure 7 The diagram shows the state in which the first positioning part is tilted relative to the first positioning pin of the support.

[0023] Figure 14 This is a schematic diagram illustrating the assembly and disassembly of the liquid injection head relative to the support body according to the first embodiment.

[0024] Figure 15 Observed along the Z2 direction Figure 6 A diagram of the second positioning part of the liquid injection head.

[0025] Figure 16 for Figure 15 BB line section view.

[0026] Figure 17 Observed along the Z1 direction Figure 15 The diagram shows the second positioning part.

[0027] Figure 18 For use in setting Figure 15 A plan view illustrating the second imaginary cylinder in the second positioning part.

[0028] Figure 19 For use in setting Figure 15 A cross-sectional view illustrating the second imaginary cylinder in the second positioning section.

[0029] Figure 20 To indicate that the second locating pin of the support body is inserted into Figure 15 A diagram showing the state of the second positioning section.

[0030] Figure 21 This is a diagram of the first positioning part of the liquid injection head according to the second embodiment, as viewed along the Z2 direction.

[0031] Figure 22 for Figure 21 EE line section view.

[0032] Figure 23 Observed along the Z1 direction Figure 21 The diagram shows the first positioning part.

[0033] Figure 24 This is a diagram of the first positioning part of the liquid injection head according to the third embodiment, as viewed along the Z2 direction.

[0034] Figure 25 for Figure 24 FF line section view.

[0035] Figure 26 Observed along the Z1 direction Figure 24 The diagram shows the first positioning part.

[0036] Figure 27 This is a diagram of the first positioning part of the liquid injection head according to the fourth embodiment, as viewed along the Z2 direction.

[0037] Figure 28 for Figure 27 The cross-sectional view along the GG line.

[0038] Figure 29 for Figure 27 The cross-sectional view along the GG line.

[0039] Figure 30 This is a diagram of the second positioning part of the liquid injection head according to the fourth embodiment, as viewed along the Z2 direction.

[0040] Figure 31 for Figure 30 The HH line section view in the image.

[0041] Figure 32 for Figure 30 The HH line section view in the image.

[0042] Figure 33 This is a cross-sectional view showing the state in which the first locating pin is inserted into the first locating part of the liquid injection head according to the fifth embodiment.

[0043] Figure 34This is a cross-sectional view showing the state in which the first locating pin is inserted into the first locating part of the liquid injection head according to the sixth embodiment.

[0044] Figure 35 This is a diagram of the first positioning part of the liquid injection head involved in the modified example 1, as observed along the Z2 direction.

[0045] Figure 36 for Figure 35 The section view along line JJ in the image.

[0046] Figure 37 Observed along the Z1 direction Figure 35 The diagram shows the first positioning part.

[0047] Figure 38 This is a plan view of the liquid injection head involved in Modified Example 2.

[0048] Figure 39 This is a diagram of the first positioning part of the liquid injection head involved in the modified example 2, as observed along the Z2 direction.

[0049] Figure 40 for Figure 39 KK line cross-sectional view.

[0050] Figure 41 This is a diagram of the second positioning part of the liquid injection head involved in the modified example 2, as observed along the Z2 direction.

[0051] Figure 42 for Figure 41 LL-line sectional view.

[0052] Figure 43 This is a plan view of the liquid injection head involved in Modified Example 3.

[0053] Figure 44 This is a schematic diagram used to illustrate the assembly and disassembly of the liquid injection head relative to the support body in Modified Example 4.

[0054] Figure 45 This is a cross-sectional view of the first positioning part involved in variation example 4.

[0055] Figure 46 This is a cross-sectional view of the second positioning part involved in variation example 4.

[0056] Figure 47 This is a schematic diagram illustrating the assembly and disassembly of the liquid injection head relative to the support body in Modified Example 5.

[0057] Figure 48 This is a cross-sectional view of the first positioning part involved in variation example 5.

[0058] Figure 49This is a cross-sectional view of the second positioning part involved in variation example 5. Detailed Implementation

[0059] Hereinafter, preferred embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the dimensions and scales of the various parts in the drawings differ appropriately from actual dimensions, and some parts are shown schematically for ease of understanding. Furthermore, unless otherwise specified in the following description, the scope of the present disclosure is not limited to these embodiments.

[0060] For ease of understanding, the following explanation uses intersecting X-axis, Y-axis, and Z-axis as appropriate. Furthermore, in the following text, one direction along the X-axis is the X1 direction, and the opposite direction is the X2 direction. Similarly, opposite directions along the Y-axis are the Y1 and Y2 directions. Furthermore, opposite directions along the Z-axis are the Z1 and Z2 directions.

[0061] Here, Z1 or Z2 is an example of a "first direction". Y1 or Y2 is an example of a "second direction". Y2 is an example of "one side of the second direction, i.e., the first side", and Y1 is an example of "the other side of the second direction, i.e., the second side". X1 or X2 is an example of a "third direction". Additionally, in the following text, observation along the Z-axis will sometimes be referred to as "planar observation".

[0062] 1. First Implementation Method

[0063] 1-1. Overview of the liquid injection device

[0064] Figure 1 This is a schematic diagram illustrating a structural example of the liquid jetting apparatus 100 according to the first embodiment. The liquid jetting apparatus 100 is an inkjet printing apparatus that jets an ink, an example of a liquid, such as ink, as droplets onto a medium M. The medium M is typically printing paper. However, the medium M is not limited to printing paper; for example, it can be any printing material such as resin film or cloth.

[0065] In the first embodiment, the X-axis, Y-axis, and Z-axis are coordinate axes of a local coordinate system based on the three-dimensionally configured liquid injection head 1 (described later). Therefore, in Figures 1 to 5 , Figures 12 to 14 ,as well as Figure 20The diagram shows the coordinate axes of a local coordinate system with respect to the liquid jet head 1 when it is supported on the support body 51 (described later). Therefore, in the following description relating to the first embodiment, the local coordinate system with respect to the liquid jet head 1 when it is supported on the support body 51 will sometimes be used to describe structures other than the liquid jet head 1.

[0066] like Figure 1 As shown, the liquid injection device 100 includes a liquid container 10, a control unit 20, a conveying mechanism 30, a moving mechanism 40, a head module 50, and a circulation mechanism 60. In the following text, based on... Figure 1 And then we will briefly explain them one by one.

[0067] Liquid container 10 stores ink. Specific examples of liquid container 10 include a box that can be detached from the liquid jetting device 100, a bag-shaped ink bag formed of a flexible membrane, and an ink canister that can be refilled with ink.

[0068] Although the liquid container 10 of this embodiment is not shown, it has multiple containers for storing different types of ink. While the inks stored in these multiple containers are not particularly limited, examples include aqueous inks that dissolve color materials such as dyes or pigments in aqueous solvents, solvent-based inks that dissolve color materials in organic solvents, and UV-curable inks.

[0069] The control unit 20 includes processing circuits such as a CPU (Central Processing Unit) or FPGA (Field Programmable Gate Array) and storage circuits such as semiconductor memory, and controls the operation of various elements of the liquid jetting device 100. The control unit 20 controls the ink jetting operation performed by the head module 50.

[0070] The conveying mechanism 30, under the control of the control unit 20, conveys the medium M in the Y1 direction, i.e., the conveying direction DM. The moving mechanism 40, under the control of the control unit 20, causes the head module 50 to reciprocate in the X1 and X2 directions. Figure 1 In the example shown, the moving mechanism 40 has a generally box-shaped conveyor body 41, called a carriage, which houses the head module 50, and a conveyor belt 42 that fixes the conveyor body 41. In addition to the head module 50, the liquid container 10 described above can also be mounted on the conveyor body 41.

[0071] 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 into the medium M from various nozzles along the Z2 direction. This ejection, 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 moving mechanism 40, forms an image on the surface of the medium M achieved by the ink. The head module 50 has multiple liquid ejection heads 1. Details regarding the liquid ejection heads 1 will be provided below. Figures 2 to 20 Let me explain.

[0072] exist Figure 1 In the example shown, 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 recovers ink discharged from the head module 50 for resupply to the head module 50.

[0073] 1-2. Liquid injection head

[0074] Figure 2 This is a perspective view of a head module 50 having the liquid injection head 1 according to the first embodiment. Figure 2 As shown, the head module 50 has a support body 51 and a plurality of liquid injection heads 1. The liquid injection heads 1 are longer in the direction along the Y-axis.

[0075] The support body 51 is a plate-shaped component that supports multiple liquid injection heads 1. Multiple openings 51a, multiple locating pins 51b, and multiple screw holes 51c are provided on the support body 51. The support body 51 is fixed to the conveyor body 41 by a fixing unit (not shown). Alternatively, the support body 51 itself may be the conveyor body 41. Furthermore, the shape of the support body 51 may not be plate-shaped; it may be a box-shaped recess capable of accommodating multiple liquid injection heads 1, for example.

[0076] The opening 51a is a hole for inserting the liquid injection head 1 with the injection surface FN facing the Z2 direction, and it penetrates the support body 51 in the thickness direction. Figure 2 In the example shown, each opening 51a extends in the direction along the Y-axis, and two liquid injection heads 1 are inserted into one opening 51a.

[0077] The locating pin 51b is a rod-shaped protrusion located near the periphery of the opening 51a and protruding from the Z1-direction surface FP of the support body 51. In this embodiment, the locating pin 51b has a circular shape when viewed in plan view, specifically a perfect circle. The locating pin 51b is inserted into the locating portion 13e provided on the liquid injection head 1, described later, by pressing. The locating portion 13e can be either a through hole or a blind hole; in this embodiment, it is a through hole. Furthermore, the pressing process will be described in detail below, referring to what is known as an interference fit or a transition fit. Figure 2 In the example shown, two locating pins 51b are provided for one liquid injection head 1. Details regarding the locating pins 51b will be provided below. Figure 5 Let me explain.

[0078] The screw hole 51c is an internal thread located near the periphery of the opening 51a and on the Z1-oriented surface of the support body 51. A screw (not shown) is fitted into the screw hole 51c. This screw passes through the hole 13f of the liquid injection head 1 (described later) and secures the liquid injection head 1 to the support body 51. Figure 2 In the example shown, two screw holes 51c are provided for a liquid injection head 1.

[0079] As described above, multiple liquid injection heads 1 are mounted relative to the support body 51. Figure 2 In the example shown, multiple liquid jet heads 1 are configured in an array along the X-axis and Y-axis.

[0080] Furthermore, the number and configuration of the liquid injection heads 1 in the head module 50 are not limited to... Figure 2 The examples shown represent any number and configuration. Furthermore, the shape of the support 51 is not limited to... Figure 2 The example shown is of any shape. Furthermore, the opening 51a can also be provided for one or more liquid injection heads 1.

[0081] Figure 3 This is an exploded perspective view of the liquid injection head 1 according to the first embodiment. Figure 3 As shown, the liquid injection head 1 includes a flow channel structure 11, a wiring board 12, a support 13, four head chips HC, a fixing plate 14, a reinforcing plate 15, a cover 16, and a sealing component 17. These components are arranged in the Z2 direction in the following order: cover 16, wiring board 12, flow channel structure 11, sealing component 17, support 13, four head chips HC, reinforcing plate 15, and fixing plate 14. The support 13 is an example of a "first component." The various parts of the liquid injection head 1 will be described sequentially below.

[0082] The flow channel structure 11 is a structure with internal flow channels for supplying ink from the circulation mechanism 60 to four head chips HC. The flow channel structure 11 has a flow channel component 11a and four connecting pipes 11b to 11e. Although in Figure 3 Although not shown in the diagram, the flow channel component 11a has two supply channels for supplying ink to the four head chips HC and two discharge channels for discharging ink from the four head chips HC. The flow channel component 11a has multiple substrates Su1 to Su5, which are stacked sequentially in the Z2 direction and bonded together by, for example, an adhesive. Connecting tubes 11b to 11e are tubes protruding from the Z1-oriented surface of the flow channel component 11a. Connecting tubes 11b and 11c are connected to the two supply channels, and connecting tubes 11d and 11e are connected to the two discharge channels. Furthermore, the flow channel component 11a has multiple holes 11f. Screws SC are inserted into each hole 11f. The screws SC secure the flow channel component 11a to the bracket 13.

[0083] The wiring board 12 is a mounting component for electrically connecting the liquid injection head 1 to the control unit 20, and is disposed on the flow channel structure 11. A connector 12a is provided on the surface of the wiring board 12 facing the Z1 direction. The connector 12a is a connection component for electrically connecting the liquid injection head 1 and the control unit 20. In addition, although not shown, wiring for connecting to the four head chips HC is connected on the wiring board 12.

[0084] The bracket 13 is a structure for housing and supporting the four head chips HC. The bracket 13 is provided with multiple bracket channels 13a, multiple wiring holes 13b, multiple recesses 13c, multiple screw holes 13d, multiple holes 13f, and multiple positioning parts 13e.

[0085] The bracket 13 is made of, for example, resin or metal. In this embodiment, since the positioning pin 51b is pressed into the positioning part 13e, both the bracket 13 and the positioning pin 51b are made of metal. Examples of metal materials include iron, titanium, aluminum, magnesium, or alloys containing at least one of these metal elements. Examples of alloys include stainless steel, Alloy 42, and Invar. In this embodiment, the bracket 13 and the positioning pin 51b are made of the same metal material, specifically stainless steel. Furthermore, the positioning pin 51b and the support body 51 can be formed as a single unit, or they can be separate units joined together.

[0086] Multiple support channels 13a are holes for allowing ink to flow between the head chip HC and the channel structure 11. The support channels 13a are provided corresponding to the respective inlets R_in and outlets R_out, described later. Multiple wiring holes 13b are holes (not shown) through which wiring (not shown) for connecting the head chip HC and the wiring substrate 12 passes. Multiple recesses 13c open in the Z2 direction, providing space for the head chip HC. Multiple screw holes 13d are internal threads that engage with screws SC. By fastening the screws SC, which are inserted into the holes 11f of the channel component 11a, into the screw holes 13d, the channel component 11a is pressed towards the support 13. Screws (not shown) are inserted into the multiple holes 13f to fix the liquid injection head 1 to the aforementioned support 51. Positioning pins 51b of the aforementioned support 51 are inserted into the multiple positioning portions 13e. Details regarding the multiple positioning portions 13e will be provided below based on... Figures 6 to 20 Let me explain.

[0087] Each inkjet chip HC ejects ink. Each inkjet chip HC is provided with an ink inlet R_in for introducing ink and an ink outlet R_out for discharging ink. The ink inlet R_in and the ink outlet R_out are respectively bonded to the inkjet chip HC and the support 13 by means of adhesive, thereby liquid-tightly connecting with the corresponding support channel 13a.

[0088] Figure 4 This is a plan view of the liquid injection head 1 as seen along the Z1 direction according to the first embodiment. Figure 4 As shown, 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 the surface of the nozzle plate on which the multiple nozzles N are formed, facing the Z2 direction. The multiple nozzles N are arranged in a nozzle array along the Y-axis direction. Although not shown, each head chip HC has a piezoelectric element as a driving element for each nozzle N, and a pressure chamber for receiving ink supplied from the inlet R_in. Here, the piezoelectric element causes a change in the pressure of the ink in the pressure chamber corresponding to the piezoelectric element, thereby causing the ink to be ejected from the nozzle corresponding to the pressure chamber. Such a head chip HC is obtained, for example, by bonding multiple substrates, such as a silicon substrate, which are appropriately processed by etching or the like, using an adhesive. In addition, as a driving element for ejecting ink from the nozzles N, a heater that heats the ink in the pressure chamber can be used instead of the piezoelectric element.

[0089] The fixing plate 14 is a plate component used to fix four head chips HC onto the support 13. Specifically, the fixing plate 14 is configured to clamp the four head chips HC between itself and the support 13, and is fixed to the support 13 by adhesive. The fixing plate 14 is made of, for example, a metal material. Multiple openings 14a are provided on the fixing plate 14 to expose the multiple nozzles N of each of the four head chips HC. Here, the Z2-oriented surface FN_B of the fixing plate 14 and the four nozzle-forming surfaces FN_A constitute the Z2-oriented spray surface FN of the liquid injection head 1. That is, the spray surface FN is a surface with multiple nozzles N. The multiple openings 14a are individually provided for each head chip HC.

[0090] The reinforcing plate 15 is a plate-shaped component disposed between the support 13 and the fixing plate 14 to reinforce the fixing plate 14. The reinforcing plate 15 is overlapped on the fixing plate 14 and fixed to the fixing plate 14 by adhesive. The reinforcing plate 15 has multiple openings 15a for arranging four head chips HC. The reinforcing plate 15 is made of, for example, a metal material.

[0091] The cover 16 is a box-shaped component that houses the flow channel component 11a and the wiring board 12 of the flow channel structure 11, and is made of, for example, resin material. The cover 16 has four through holes 16a and an opening 16b. One of the connecting tubes 11b to 11e is inserted into one of the four through holes 16a. The connector 12a passes through the opening 16b from the inside to the outside of the cover 16.

[0092] The sealing component 17 is an elastic component used for a liquid-tight connection between the flow channel of the flow channel structure 11 and the support flow channel 13a of the support 13. Figure 3 In the example shown, the sealing member 17 is sheet-shaped and has multiple ink holes 17a, multiple wiring holes 17b, and multiple holes 17c. The multiple ink holes 17a are for allowing ink to flow between the flow channel structure 11 and the support 13, and are provided corresponding to the inlet R_in and outlet R_out. The multiple wiring holes 17b are holes through which wiring (not shown) passes for connecting the connector chip HC and the wiring substrate 12. The multiple holes 17c are holes for inserting screws SC.

[0093] 1-3. Positioning of the liquid injection head relative to the support body

[0094] Figure 5 This is a perspective view of the support 51 according to the first embodiment. Figure 5 As shown, on the support body 51, 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 are provided near the outer edge of each of the plurality of openings 51a.

[0095] The first locating pin 51b_1 and the second locating pin 51b_2 are respectively as described above. Figure 2 The positioning pin 51b is shown. The first positioning pin 51b_1 is inserted into the first positioning part 13e_1 of the liquid injection head 1, which will be described later. On the other hand, the second positioning pin 51b_2 is inserted into the second positioning part 13e_2 of the liquid injection head 1, which will be described later.

[0096] exist Figure 5 In the example shown, one first positioning pin 51b_1 and one second positioning pin 51b_2 are provided in each liquid injection head 1. Furthermore, the first positioning pin 51b_1 and the second positioning pin 51b_2 corresponding to one liquid injection head 1 are arranged in the direction along the Y-axis. More specifically, the first positioning pin 51b_1 is configured in the Y2 direction relative to the second positioning pin 51b_2.

[0097] Screw holes 51c_1 and 51c_2 are respectively the above-mentioned Figure 2 The screw hole 51c is shown. In screw hole 51c_1, a screw corresponding to hole 13f_1 of liquid injection head 1 (described later) is fitted. On the other hand, in screw hole 51c_2, a screw corresponding to hole 13f_2 of liquid injection head 1 (described later) is fitted.

[0098] exist Figure 5 In the example shown, screw holes 51c_1 and 51c_2 are each provided in each liquid injection head 1. Furthermore, screw holes 51c_1 and 51c_2 corresponding to a liquid injection head 1 are arranged along the Y-axis. More specifically, screw hole 51c_1 is positioned relative to screw hole 51c_2 in the Y2 direction. Here, in the locating pin 51b and screw hole 51c corresponding to a liquid injection head 1, the first locating pin 51b_1 is located closer to screw hole 51c_1 than screw hole 51c_2, and the second locating pin 51b_2 is located closer to screw hole 51c_2 than screw hole 51c_1.

[0099] Figure 6 This is a plan view of the liquid injection head 1 as seen along the Z2 direction according to the first embodiment. Figure 6 As shown, in the liquid injection head 1, when viewed along the Z2 direction, the support 13 has a flange portion 13h protruding from the cover 16. Figure 4As shown, when viewed in a plane along the Z1 direction, the flange portion 13h protrudes outward from the entire circumference of the side of the support 13. The surface of the flange portion 13h facing the Z2 direction, i.e., the second surface F2, contacts the surface of the support body 51 facing the Z1 direction, i.e., the protruding surface FP. 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.

[0100] The first positioning part 13e_1 and the second positioning part 13e_2 are respectively described above. Figure 2 The positioning part 13e is shown. A first positioning pin 51b_1 of the support body 51 is inserted into the first positioning part 13e_1. Conversely, a second positioning pin 51b_2 of the support body 51 is inserted into the second positioning part 13e_2.

[0101] exist Figure 6 In the example shown, one first positioning part 13e_1 and one second positioning part 13e_2 are each provided in each liquid injection head 1. Furthermore, the first positioning part 13e_1 and the second positioning part 13e_2 are arranged in the direction along the Y-axis. More specifically, the first positioning part 13e_1 is positioned relative to the second positioning part 13e_2 in the Y2 direction. Moreover, when viewed in a plane along the Z1 direction, at least a portion of the injection surface FN is located between the first positioning part 13e_1 and the second positioning part 13e_2.

[0102] Hole 13f_1 and hole 13f_2 are respectively the above-mentioned Figure 2 The hole 13f is shown. A screw that engages with the screw hole 51c_1 of the support body 51 is inserted into the hole 13f_1. On the other hand, a screw that engages with the screw hole 51c_2 of the support body 51 is inserted into the hole 13f_2.

[0103] exist Figure 6 In the example shown, one hole 13f_1 and one hole 13f_2 are provided in each liquid injection head 1. Furthermore, holes 13f_1 and 13f_2 are arranged along the Y-axis. More specifically, hole 13f_1 is positioned relative to hole 13f_2 in the Y2 direction. Here, the first positioning part 13e_1 is located closer to hole 13f_1 than to hole 13f_2. The second positioning part 13e_2 is located closer to hole 13f_2 than to hole 13f_1.

[0104] Figure 7 Observed along the Z2 direction Figure 6 A diagram of the first positioning part 13e_1 of the liquid injection head 1 shown. Figure 8 for Figure 7 Sectional view along line AA in the diagram. Figure 9Observed along the Z1 direction Figure 7 The diagram shows the first positioning part 13e_1. (See figure.) Figures 7 to 9 As shown, the first positioning part 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 arranged sequentially in the Y2 direction.

[0105] The first through hole 2 is a hole that penetrates the flange portion 13h of the bracket 13. Here, the flange portion 13h has a surface facing the Z1 direction, i.e., a first surface F1, and a surface facing the Z2 direction, i.e., a second surface F2. The first through hole 2 penetrates from the first surface F1 to the second surface F2 along the Z-axis. In this embodiment, as... Figure 7 as well as Figure 9 As shown, the first through hole 2 appears circular when viewed in a plane. Furthermore, the shape of the first through hole 2 when viewed in a plane is not limited to... Figure 7 as well as Figure 9 The example shown.

[0106] The first recess 3 is provided on the first surface F1, and when viewed in a plane, it is adjacent to the portion of the first through hole 2 on the Y1 direction side. On the other hand, the second recess 4 is provided on the second surface F2, and when viewed in a plane, it is adjacent to the portion of the first through hole 2 on the Y2 direction side.

[0107] Here, the combined depth 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 support 13). In other words, the combined length of the first contact portion CT1 along the Z-axis and the second contact portion CT2 along the Z-axis (described later) 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 support 13). Furthermore, the shape of the first recess 3 as viewed from a planar perspective is not limited to... Figure 7 The example shown is of arbitrary shape. Furthermore, the shape of the second recess 4 as viewed from the plane is not limited to... Figure 9 The example shown is of any shape.

[0108] Figure 10 For use in setting Figure 7 The first imaginary cylinder VC1 in the first positioning part 13e_1 shown is illustrated in a plan view. Figure 11 For use in setting Figure 7The diagram shows a cross-sectional view illustrating the first imaginary cylinder VC1 within the first positioning portion 13e_1. The first imaginary cylinder VC1 is an imaginary cylinder inserted to its deepest point within the first positioning portion 13e_1, and whose cross-sectional area is maximized when viewed along the depth direction (along the Z-axis) of the first positioning portion 13e_1. The first imaginary cylinder VC1 is not an oblique cylinder, but a straight cylinder. Figure 10 In the example shown, the planar shape of the first imaginary cylinder VC1 is a perfect circle. That is, the bottom surface of the first imaginary cylinder VC1 is a perfect circle. However, since the planar shape of the first imaginary cylinder VC1 is defined based on the planar shape of the first positioning part 13e_1, it is also possible for it to be elliptical. In such a case, the first imaginary cylinder VC1 is an elliptical cylinder.

[0109] like Figure 11 As shown, the side surface of the first imaginary cylinder VC1 is divided into three regions along the Z-axis, including 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, relative to the first region RE1, in the direction in which the injection surface FN faces, i.e., the Z2 direction, along the Z-axis.

[0110] The first region RE1 is the area that contacts the first positioning part 13e_1 in the Y2 direction relative to the first center line LC1, which is the center line of the first imaginary cylinder VC1, but does not contact the first positioning part 13e_1 in the Y1 direction. The second region RE2 is the area that does not contact the first positioning part 13e_1 in the Y2 direction relative to the first center line LC1, but does contact the first positioning part 13e_1 in the Y1 direction. The third region RE3 is the area that does not contact the first positioning part 13e_1 in either the Y2 or Y1 direction relative to the first center line LC1. Furthermore, 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 along the Z-axis.

[0111] Here, the first recess 3 is adjacent to the portion of the first region RE1 on the Y1 direction side relative to the first center line LC1. The second recess 4 is adjacent to the portion of the second region RE2 on the Y2 direction side relative 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 along the first through hole 2 from the first surface F1 to the second surface F2. In this embodiment, the first imaginary cylinder VC1 extends from one end of the first through hole 2 along the Z-axis to the other end, corresponding to the shape of the first through hole 2. In other words, the deepest position of the first positioning part 13e_1, when the first imaginary cylinder VC1 is inserted into the Z1 direction from the opening of the first positioning part 13e_1 formed on the second surface F2, refers to the end of the first through hole 2 in the Z1 direction (i.e., the position of the first surface F1 on the Z axis), while when the first imaginary cylinder VC1 is inserted into the Z2 direction from the opening of the first positioning part 13e_1 formed on the first surface F1, refers to the end of the first through hole 2 in the Z2 direction (i.e., the position of the second surface F2 on the Z axis).

[0112] exist Figure 11 In the example shown, 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. Alternatively, these lengths may not be the same. However, from the viewpoint of ensuring the rigidity of the first positioning part 13e_1 required to prevent breakage due to the pressure acting on the first positioning part 13e_1 when the first positioning pin 51b_1 is pressed in, while also facilitating the insertion and removal of the first positioning pin 51b_1 relative to the first positioning part 13e_1, the lengths of the first region RE1 and the second region RE2 along the Z-axis are preferably 20% or more and 45% or less relative to the length of the first imaginary cylinder VC1 along the Z-axis, more preferably 25% or more and 40% or less, and even more preferably 28% or more and 38% or less. Furthermore, the length of the third region RE3 along the Z-axis is preferably 10% or more and 60% or less, more preferably 20% or more and 50% or less, and even more preferably 24% or more and 44% or less, relative to the length of the first imaginary cylinder VC1 along the Z-axis.

[0113] Thus, the first positioning part 13e_1 does not contact the portions of the second region RE2 and the third region RE3 in the Y2 direction relative to the first center line LC1, but contacts the portion of the first region RE1 in the Y2 direction relative to the first center line LC1, and does not contact the portions of the first region RE1 and the third region RE3 in the Y1 direction relative to the first center line LC1, but contacts the portion of the second region RE2 in the Y1 direction relative to the first center line LC1.

[0114] Therefore, the first positioning part 13e_1 has a first contact part CT1 that partially contacts the Y2 direction side of the first region RE1 relative to the first center line LC1, and a second contact part CT2 that partially contacts the Y1 direction side of the second region RE2 relative to the first center line LC1. In this embodiment, the first contact part CT1 and the second contact part CT2 each extend continuously in the direction along the Z-axis.

[0115] Furthermore, due to the existence of the aforementioned third region RE3, therefore in Figure 11 In the cross-section shown, the shortest distance Ds between the first contact portion CT1 and the second contact portion CT2 (refer to...) Figure 8 The maximum length Da of the first locating pin 51b_1 along the Y-axis direction (refer to...) Figure 13 The above. Furthermore, preferably, the shortest distance Ds is greater than the maximum length Da. Figure 11 The cross section shown is the cross section obtained by cutting the first positioning part 13e_1 with a plane orthogonal to the Z-axis at the position where the length of the first imaginary cylinder VC1 along the Y-axis is the largest when viewed from the plane along the X-axis.

[0116] Furthermore, in this embodiment, the maximum length Da is greater than or equal to the maximum dimension Dv of the first imaginary cylinder VC1 along the Y-axis. This maximum dimension Dv is equivalent to the diameter of the cross-section of the first imaginary cylinder VC1 perpendicular to the Z-axis. Additionally, the shortest distance Ds is greater than this maximum dimension Dv. Moreover, 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 part 13e_1, that is, in the state before the first positioning pin 51b_1 is inserted into the first positioning part 13e_1.

[0117] Here, pressing the locating pin 51b into the locating part 13e means that the maximum length of the locating pin 51b, as observed along the depth direction of the locating part 13e, is greater than the diameter of the section perpendicular to the depth direction of an imaginary perfect cylinder that is inserted to the deepest position in the locating part 13e and whose cross-sectional area is maximized when viewed along the depth direction of the locating part 13e. When the locating part 13e is pressed in by the locating pin 51b, generally speaking, the locating part 13e will deform outward relative to the locating pin 51b to allow insertion.

[0118] like Figure 10As shown, the first positioning part 13e_1 has two boundary portions BO_1 that are opposite to each other along the X-axis. The boundary portion BO_1 is, when viewed in a plane along the Z-axis, the boundary between the thin-walled portion of the first positioning part 13e_1 that defines the bottom surface of the second recess 4 and the first through hole 2, and the boundary between the thin-walled portion of the first positioning part 13e_1 that defines the bottom surface of the first recess 3 and the first through hole 2, i.e., the boundary between the first contact portion CT1 and the second contact portion CT2. The two boundary portions BO_1 extend linearly along the Z-axis from the first surface F1 to the second surface F2. Therefore, neither of the two boundary portions BO_1 is included in the portions of the first imaginary cylinder VC1 (in other words, the portions of the first region RE1, the second region RE2, and the third region RE3) relative to the first centerline LC1 in the Y1 direction or the Y2 direction.

[0119] Figure 12 To indicate that the first locating pin 51b_1 of the support body 51 is inserted into Figure 7 A diagram showing the state of the first positioning part 13e_1. Figure 13 To indicate that Figure 7 The diagram shows the state in which the first positioning part 13e_1 is tilted relative to the first positioning pin 51b_1 of the support body 51. Figure 14 This is a schematic diagram illustrating the assembly and disassembly of the liquid injection head 1 relative to the support body 51 according to the first embodiment.

[0120] exist Figure 12 The diagram shows a state where the insertion of the first positioning pin 51b_1 relative to the first positioning part 13e_1 is complete, provided that the side of the first positioning pin 51b_1 has a portion that corresponds to the side of the first imaginary cylinder VC1 described above. In this state, as... Figure 12 As shown, the first contact portion CT1 and the second contact portion CT2 respectively contact the side surface of the first positioning pin 51b_1. Furthermore, although not shown, the two boundary portions BO_1 also contact the side surface of the first positioning pin 51b_1. Through these contacts, the first positioning portion 13e_1 is positioned relative to the first positioning pin 51b_1. In this embodiment, since the first positioning pin 51b_1 and the first through hole 2 are engaged in this state, the insertion of the first positioning pin 51b_1 relative to the first positioning portion 13e_1 restricts the movement of the liquid injection head 1 relative to the support body 51 in a plane orthogonal to the Z-axis.

[0121] exist Figure 12 In the shown state, a gap formed by the first recess 3 and the second recess 4 is provided between the first positioning pin 51b_1 and the first positioning part 13e_1. Therefore, as Figure 13As shown, by tilting the first positioning part 13e_1 relative to the extending direction of the first positioning pin 51b_1, the first positioning pin 51b_1 can be inserted into the first positioning part 13e_1.

[0122] Therefore, as Figure 14 As shown, when mounting the liquid injection head 1 onto the support 51, the insertion of the first positioning pin 51b_1 into the first positioning portion 13e_1 can be performed before the insertion of the second positioning pin 51b_2 into the second positioning portion 13e_2. Furthermore, when disassembling the liquid injection head 1 from the support 51, the disassembly of the second positioning pin 51b_2 into the second positioning portion 13e_2 can be performed before the disassembly of the first positioning pin 51b_1 into the first positioning portion 13e_1. In the following description, an example of the structure of the second positioning portion 13e_2 that facilitates the assembly and disassembly of the liquid injection head 1 from the support 51 will be explained.

[0123] Figure 15 Observed along the Z2 direction Figure 6 A diagram of the second positioning part 13e_2 of the liquid injection head 1 shown. Figure 16 for Figure 15 BB line section view. Figure 17 Observed along the Z1 direction Figure 15 The diagram shows the second positioning part 13e_2. (See figure.) Figures 15 to 17 As shown, the second positioning part 13e_2 has a second through hole 5, a third recess 6, and a fourth recess 7. The second through hole 5 is disposed between the third recess 6 and the fourth recess 7 in the direction along the Y-axis. More specifically, the third recess 6, the second through hole 5, and the fourth recess 7 are arranged sequentially in the Y2 direction.

[0124] The second through hole 5 is a hole that penetrates the flange portion 13h of the bracket 13. Here, the second through hole 5 extends from the first surface F1 to the second surface F2 along the Z-axis. In this embodiment, as... Figure 15 as well as Figure 17 As shown, the second through hole 5, when viewed in a plane, is approximately an elongated oval with its long side oriented along the Y-axis. That is, the length of the second through hole 5 along the Y-axis is longer than its length along the X-axis. Here, the length of the second through hole 5 along the X-axis is equal to the length of the first through hole 2 along the X-axis. Furthermore, the length of the second through hole 5 along the Y-axis is longer than the length of the first through hole 2 along the Y-axis. Moreover, in this embodiment, the first locating pin 51b_1 and the second locating pin 51b_2 are approximately the same shape. Therefore, even if manufacturing errors occur... Figure 5The first locating pin 51b_1 and the second locating pin 51b_2, corresponding to a liquid injection head 1, are offset in the Y-axis direction. This offset is mitigated by the fact that the second through hole 5, when viewed in planar view, has its Y-axis direction set as the long side, thus absorbing manufacturing errors. Furthermore, the shape of the second through hole 5 in planar view is not limited to... Figure 15 as well as Figure 17 The example shown. Furthermore, the dimensional relationship between the first through hole 2 and the second through hole 5 when viewed in planar view varies depending on the dimensional relationship between the first locating pin 51b_1 and the second locating pin 51b_2 when viewed in planar view, and is not limited to... Figure 15 as well as Figure 17 The example shown.

[0125] The third recess 6 is provided on the first surface F1 and is adjacent to the portion of the second through hole 5 in the Y1 direction when viewed in a plane. On the other hand, the fourth recess 7 is provided on the second surface F2 and is adjacent to the portion of the second through hole 5 in the Y2 direction when viewed in a plane.

[0126] Here, the combined depth 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 support 13). In other words, the combined length of the third contact portion CT3 along the Z-axis and the fourth contact portion CT4 along the Z-axis, as described later, 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 support 13). Furthermore, the shape of the third recess 6 as viewed from a planar perspective is not limited to... Figure 15 The example shown is of arbitrary shape. Furthermore, the shape of the fourth recess 7 as viewed from the plane is not limited to... Figure 17 The example shown is of arbitrary shape. Furthermore, although the depths of the third recess 6 and the fourth recess 7 are not specifically limited to any depth, it has the advantage of simplifying the manufacturing and design of the bracket 13 when 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.

[0127] Figure 18 For use in setting Figure 15 A plan view illustrating the second imaginary cylinder VC2 in the second positioning part 13e_2 shown. Figure 19 For use in setting Figure 15 A cross-sectional view illustrating the second imaginary cylinder VC2 in the second positioning part 13e_2 shown. Figure 20 To indicate that the second locating pin 51b_2 of the support body 51 is inserted into Figure 15The diagram shows the state of the second positioning part 13e_2. The second imaginary cylinder VC2 is an imaginary cylinder whose cross-sectional area is maximized when inserted to the deepest position of the second positioning part 13e_2 and viewed along the depth direction (along the Z-axis) of the second positioning part 13e_2. The second imaginary cylinder VC2, like the first imaginary cylinder VC1, is a straight cylinder. Figure 18 In the example shown, the planar shape of the second imaginary cylinder VC2 is elliptical. That is, the base of the second imaginary cylinder VC2 is elliptical. Furthermore, since the planar shape of the second imaginary cylinder VC2 is defined based on the planar shape of the second positioning part 13e_2, it is also possible for it to be a perfect circle. In such a case, the second imaginary cylinder VC2 becomes a perfect circular cylinder.

[0128] like Figure 18 As shown, the side surface of the second imaginary cylinder VC2 is divided into three regions along the Z-axis, including 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, relative to the fourth region RE4, in the direction in which the injection surface FN faces, i.e., the Z2 direction.

[0129] The fourth region RE4 is the area where the second centerline LC2, which is the centerline of the second imaginary cylinder VC2, contacts the second positioning part 13e_2 in the Y2 direction but does not contact it in the Y1 direction. The fifth region RE5 is the area where the second positioning part 13e_2 does not contact it in the Y2 direction but does contact it in the Y1 direction. The sixth region RE6 is the area where the second positioning part 13e_2 does not contact it in either the Y2 or Y1 direction relative to the second centerline LC2. Furthermore, the second centerline LC2 is a straight line that passes through the center of the bottom surface of the second imaginary cylinder VC2 and extends along the Z-axis.

[0130] Here, the third recess 6 is adjacent to the portion of the fourth region RE4 on the Y1 direction side relative to the second center line CL2. The fourth recess 7 is adjacent to the portion of the fifth region RE5 on the Y2 direction side relative to the second center line CL2. The third recess 6 and the fourth recess 7 are respectively adjacent to the sixth region RE6. The second imaginary cylinder VC2 extends along the second through hole 5 from the first surface F1 to the second surface F2. In this embodiment, the second imaginary cylinder VC2 extends from one end to the other in the Z-axis direction of the second through hole 5. In other words, the deepest position of the second positioning part 13e_2, when the second imaginary cylinder VC2 is inserted into the Z1 direction through the opening of the second positioning part 13e_2 formed on the second surface F2, refers to the end of the second through hole 5 in the Z1 direction (i.e., the position of the first surface F1 on the Z-axis), while when the second imaginary cylinder VC2 is inserted into the Z2 direction through the opening of the second positioning part 13e_2 formed on the first surface F1, refers to the end of the second through hole 5 in the Z2 direction (i.e., the position of the second surface F2 on the Z-axis).

[0131] exist Figure 18 In the example shown, the lengths of the fourth region RE4 and the fifth region RE5 along the Z-axis are equal. Alternatively, their lengths may differ. However, preferably, the lengths of the fourth region RE4 and the fifth region RE5 along the Z-axis are 20% or more and 45% or less, more preferably 25% or more and 40% or less, and even more preferably 28% or more and 38% or less, relative to the length of the second imaginary cylinder VC2 along the Z-axis. Furthermore, preferably, the length of the sixth region RE6 along the Z-axis is 10% or more and 60% or less, more preferably 20% or more and 50% or less, and even more preferably 24% or more and 44% or less, relative to the length of the second imaginary cylinder VC2 along the Z-axis.

[0132] Thus, the second positioning part 13e_2 does not contact the portions of the fifth region RE5 and the sixth region RE6 in the Y2 direction relative to the second center line LC2, but contacts the portion of the fourth region RE4 in the Y2 direction relative to the second center line LC2, and does not contact the portions of the fourth region RE4 and the sixth region RE6 in the Y1 direction relative to the second center line LC2, but contacts the portion of the fifth region RE5 in the Y1 direction relative to the second center line LC2.

[0133] Therefore, the second positioning part 13e_2 has a third contact part CT3 that partially contacts the Y2 direction side of the fourth region RE4 relative to the second center line LC2, and a fourth contact part CT4 that partially contacts the Y1 direction side of the fifth region RE5 relative to the second center line LC2. The third contact part CT3 and the fourth contact part CT4 each extend continuously in the direction along the Z-axis.

[0134] like Figure 17 As shown, the second positioning part 13e_2 has two boundary portions BO_2 that are opposite to each other along the X-axis. The boundary portion BO_2 is, when viewed in a plane along the Z-axis, the boundary between the thin-walled portion of the second positioning part 13e_2 that defines the bottom surface of the third recess 6 and the second through hole 5, and the boundary between the thin-walled portion of the second positioning part 13e_2 that defines the bottom surface of the fourth recess 7 and the second through hole 5, i.e., the boundary between the third contact portion CT3 and the fourth contact portion CT4. Since the two boundary portions BO_2 each have a predetermined length along the Y-axis when viewed in a plane, they extend in a planar shape from the first surface F1 to the second surface F2 along the Z-axis. Therefore, neither of the two boundary portions BO_2 is included in the portions of the second imaginary cylinder VC2 (in other words, the portions of the fourth region RE4, the fifth region RE5, and the sixth region RE6) relative to the second centerline LC2 in the Y1 direction or the Y2 direction.

[0135] Here, as mentioned above, since the length of the second through hole 5 along the Y-axis is longer than the length of the second through hole 5 along the X-axis, when the shape of the second locating pin 51b_2 is circular when viewed from the plane, as... Figure 20 As shown, one or both of the third contact portion CT3 and the fourth contact portion CT4 do not contact the side of the second locating pin 51b_2. That is, because the length of the second through hole 5 along the Y-axis is greater than the maximum length of the second locating pin 51b_2 along the Y-axis, the above-mentioned... Figure 14 The liquid injection head 1 shown is easy to assemble and disassemble relative to the support body 51.

[0136] Furthermore, due to the existence of the fourth region RE4 and the sixth region RE6 as described above, therefore in Figure 18 In the cross-section shown, the shortest distance between the third contact portion CT3 and the fourth contact portion CT4 is greater than the maximum length of the second imaginary cylinder VC2 along the Y-axis. Therefore, the above-mentioned... Figure 14Such a liquid injection head 1 is easier to assemble and disassemble relative to the support body 51. In addition, the shortest distance between the third contact part CT3 and the fourth contact part CT4, and the maximum length of the second positioning pin 51b_2 along the Y-axis, are the lengths or distances measured before the second positioning pin 51b_2 is inserted into the second positioning part 13e_2, that is, in the state where the second positioning pin 51b_2 is not inserted into the second positioning part 13e_2.

[0137] Furthermore, with the second positioning pin 51b_2 inserted into the second positioning part 13e_2, the second positioning part 13e_2 contacts both ends of the side of the second positioning pin 51b_2 along the X-axis. This contact restricts the movement of the second positioning part 13e_2 relative to the second positioning pin 51b_2 in the X-axis direction. Moreover, by inserting the second positioning pin 51b_2 relative to the second positioning part 13e_2 in addition to inserting the first positioning pin 51b_1 relative to the first positioning part 13e_1, the rotation of the liquid injection head 1 relative to the support body 51 in a plane orthogonal to the Z-axis can be restricted.

[0138] As described above, the liquid jetting device 100 includes a liquid jetting head 1 and a support body 51 having a first positioning pin 51b_1. The liquid jetting head 1 is supported by the support body 51 having the first positioning pin 51b_1, and jets ink, an example of a "liquid". Here, as described above, the liquid jetting head 1 has a first positioning part 13e_1, which positions the liquid jetting head 1 relative to the support body 51 by inserting the first positioning pin 51b_1.

[0139] When the imaginary cylinder with the largest cross-sectional area when inserted into the deepest position of the first positioning part 13e_1 and viewed along the depth direction of the first positioning part 13e_1, i.e., the first direction (along the Z-axis), is defined as the first imaginary cylinder VC1, the side of the first imaginary cylinder VC1 is divided into three regions in the first direction, including the first region RE1, the second region RE2, and the third region RE3 disposed between the first region RE1 and the second region RE2.

[0140] The first region RE1, relative to the centerline LC1 of the first imaginary cylinder VC1, contacts the first positioning part 13e_1 on one side (the first side, the Y2 direction side) of a second direction orthogonal to the first direction (along the Y-axis), but does not contact the first positioning part 13e_1 on the other side (the second side, the Y1 direction side). The second region RE2, relative to the first centerline LC1, does not contact the first positioning part 13e_1 on the first side (the Y2 direction side), but contacts the first positioning part 13e_1 on the second side (the Y1 direction side). The third region RE3, relative to the first centerline LC1, does not contact the first positioning part 13e_1 on either the first side (the Y2 direction side) or the second side (the Y1 direction side).

[0141] In the liquid injection head 1 described above, since the first region RE1 contacts the first positioning part 13e_1 on the first side (Y2 direction side) relative to the first center line LC1, and the second region RE2 contacts the first positioning part 13e_1 on the second side (Y1 direction side) relative to the first center line LC1, when the side of the first positioning pin 51b_1 corresponds to the side of the first imaginary cylinder VC1, the liquid injection head 1 can be positioned relative to the support body 51 by inserting the first positioning pin 51b_1 into the first positioning part 13e_1.

[0142] Here, a comparative example is envisioned in which the positioning portion of the liquid jet head into which the positioning pin of the support body is inserted is constituted only by a through hole extending in the direction along the Z-axis. In this comparative example, there is no first recess 3 and second recess 4 as in the first positioning portion 13e_1. Therefore, in this comparative example, in order to insert and remove the positioning pin relative to the positioning portion, the liquid jet head needs to slide relative to the support body along the protruding direction of the positioning pin. In such a comparative example, the insertion and removal performance of the positioning pin relative to the positioning portion is poor. Specifically, the narrower the gap between the two when the positioning pin is inserted into the positioning portion, the worse the insertion and removal performance. In particular, when the positioning pin is inserted into the positioning portion by pressing, since friction occurs between the positioning pin and the positioning portion during insertion and removal, a large force is required for insertion and removal. Furthermore, when inserting the positioning pin into the positioning portion, it is necessary to insert both positioning pins into the two positioning portions simultaneously, but this is not easy. In addition, at this time, it is difficult for operators to visually confirm the position of the liquid spray head, so there is a possibility that the spray head may hit the positioning pin or other parts and be damaged.

[0143] On the other hand, in this embodiment, the first region RE1 does not contact the first positioning part 13e_1 on the second side (Y1 direction side) relative to the first center line LC1, the second region RE2 does not contact the first positioning part 13e_1 on the first side (Y2 direction side) relative to the first center line LC1, and the third region RE3 does not contact the first positioning part 13e_1 on both the first side (Y2 direction side) and the second side (Y1 direction side) relative to the first center line LC1. Therefore, by tilting the liquid injection head 1 relative to the extension direction of the first positioning pin 51b_1, the liquid injection head 1 can be detached from the support body 51. That is, by setting the structure such that the shortest distance Ds between the first contact part CT1 and the second contact part CT2 is greater than the maximum dimension Dv of the first imaginary cylinder VC1 along the Y-axis (equivalent to the maximum dimension of the first through hole 2 along the Y-axis). Therefore, compared to the comparative example described above, the insertion and removal of the first locating pin 51b_1 relative to the first locating part 13e_1 is superior, thus improving the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51. Furthermore, since the first locating pin 51b_1 can be inserted into the first locating part 13e_1 before the second locating pin 51b_2 is inserted into the second locating part 13_2, it is not necessary to insert both locating pins into both locating parts simultaneously as in the comparative example, thereby improving the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51. Additionally, during the assembly and disassembly of the liquid injection head 1 relative to the support body 51, by tilting the liquid injection head 1 relative to the extending direction of the first locating pin 51b_1, the position of the spray surface FN can be easily visually confirmed by the operator, thus reducing the possibility of contact between the spray surface FN and the locating pin 51b, etc.

[0144] As described above, the liquid injection head 1 includes a bracket 13 as an example of a "first component". The bracket 13 has a first positioning portion 13e_1, a first surface F1, and a second surface F2 on the side opposite to the first surface F1. The first positioning portion 13e_1 includes a first through hole 2 extending from the second surface F2 to the first surface F1 in a first direction (Z1 direction), a first recess 3 provided on the first surface F1, and a second recess 4 provided on the second surface F2.

[0145] Here, the first through hole 2 is disposed between the first recess 3 and the second recess 4 in the second direction (along the Y-axis). The first recess 3 is adjacent to the second side (Y1 direction side) of the first region RE1 relative to the first center line LC1. The second recess 4 is adjacent to the first side (Y2 direction side) of the second region RE2 relative 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 along the first through hole 2 from the first surface F1 to the second surface F2. Therefore, by machining both the first surface F1 and the second surface F2, the first through hole 2, the first recess 3, and the second recess 4 can be formed. As a result, compared with the structure where the first positioning part 13e_1 is a blind hole (with a bottom hole), the manufacturing of the liquid injection head 1 can be simplified.

[0146] Furthermore, as described above, the length of the first region RE1 along the first direction (along the Z-axis) and the length of the second region RE2 along the first direction (along the Z-axis) are equal to each other. Therefore, the first contact portion CT1 and the second contact portion CT2 of the first positioning portion 13e_1 can be made to have equal rigidity, thereby properly preventing one of the first contact portion CT1 and the second contact portion CT2 from being less rigid than the other.

[0147] Furthermore, as described above, the lengths of the first region RE1 and the second region RE2 along the first direction (along the Z-axis) are 20% to 45% less than the length of the first imaginary cylinder VC1 along the first direction (along the Z-axis). Therefore, it is possible to improve the rigidity of the first positioning part 13e_1 while ensuring good insertion of the first positioning pin 51b_1 relative to the first positioning part 13e_1.

[0148] Furthermore, as described above, the first positioning part 13e_1 has a first contact part CT1 that contacts the first side (Y2 direction side) of the first region RE1 relative to the first center line LC1, and a second contact part CT2 that contacts the second side (Y1 direction side) of the second region RE2 relative to the first center line LC1. The first contact part CT1 and the second contact part CT2 each extend continuously in a first direction (along the Z-axis). Therefore, the first contact part CT1 and the second contact part CT2 can make surface contact with the first positioning pin 51b_1 along the first direction (along the Z-axis). As a result, the liquid injection head 1 can be positioned relative to the support body 51 with high precision.

[0149] Here, as described above, at the position where the length of the first imaginary cylinder VC1 along the second direction (along the Y-axis) is maximized when viewed along the first direction (along the Z-axis), the shortest distance Ds between the first contact portion CT1 and the second contact portion CT2 in the cross-section obtained by cutting the first positioning portion 13e_1 using planes along both the first and second directions (along the Z-axis) is greater than or equal to the maximum length Da of the first positioning pin 51b_1 along the second direction (along the Y-axis). Therefore, compared to the case where the shortest distance Ds is less than the maximum length Da, when the first positioning portion 13e_1 is tilted relative to the extending direction of the first positioning pin 51b_1, the interference between the first positioning portion 13e_1 and the first positioning pin 51b_1 can be reduced. As a result, the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51 can be improved. Furthermore, preferably, the shortest distance Ds is greater than the maximum length Da. Therefore, when the first positioning part 13e_1 is tilted relative to the extending direction of the first positioning pin 51b_1, the gap between the first positioning part 13e_1 and the first positioning pin 51b_1 is provided, thus the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51 can be further improved.

[0150] Furthermore, as described above, the liquid injection head 1 has an injection surface FN with multiple nozzles N for injecting ink, and the injection surface FN is positioned on the second side (Y1 direction side) when viewed from the first positioning part 13e_1. Moreover, the second region RE2 is positioned relative to the first region RE1 in the first direction (along the Z-axis direction) in the direction in which the injection surface FN faces (Z2 direction). In other words, the second region RE2 is closer to the protruding surface FP in the first direction (along the Z-axis direction) than the first region RE1. Therefore, the liquid injection head 1 can be mounted and dismounted from the support body 51 by tilting it relative to the extending direction of the first positioning pin 51b_1. Furthermore, it is preferable that, as in this embodiment, the long side direction of the liquid injection head 1 is along the Y-axis direction; in this case, the visual visibility of the injection surface FN can be improved by combining it with the above-described structure. Additionally, as... Figure 4 as well as Figure 6 As shown, when viewed from the first positioning part 13e_1, as long as the injection surface FN is not disposed on the first side (Y2 direction side), a portion of the injection surface FN may exist at a position offset from the first positioning part 13e_1 in the direction along the X-axis.

[0151] Furthermore, as described above, the liquid injection head 1 also includes a second positioning portion 13e_2, which positions the liquid injection head 1 relative to the support body 51 by inserting a second positioning pin 51b_2 provided on the support body 51. Moreover, the first positioning portion 13e_1 and the second positioning portion 13e_2 are arranged in a second direction (along the Y-axis). Therefore, the position and orientation of the liquid injection head 1 relative to the support body 51 can be restricted by the first positioning portion 13e_1 and the second positioning portion 13e_2. Furthermore, the second positioning pin 51b_2 can be inserted into the second positioning portion 13e_2 after the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1. Therefore, the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51 can be improved. Additionally, to achieve high-precision positioning, it is preferable to... Figure 4 as well as Figure 6 As shown, the second direction (along the Y-axis) in which the first positioning part 13e_1 and the second positioning part 13e_2 are arranged is consistent with the long side direction (along the Y-axis) of the liquid injection head 1.

[0152] Furthermore, as described above, the second positioning part 13e_2 is disposed on the second side (Y1 direction side) relative to the first positioning part 13e_1. Moreover, the second region RE2 is configured in the first direction (along the Z-axis direction) to be closer to the protruding surface FP of the first positioning pin 51b_1 of the support body 51 than the first region RE1.

[0153] Furthermore, as described above, when the imaginary cylinder with the largest cross-sectional area when inserted into the deepest position of the second positioning part 13e_2 and viewed along the first direction (along the Z-axis) is designated as the second imaginary cylinder VC2, the side of the second imaginary cylinder VC2 includes a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth region RE4 and the fifth region RE5, as three regions divided in the first direction (along the Z-axis).

[0154] The fourth region RE4 contacts the second positioning part 13e_2 on the first side (Y2 direction side) relative to the center line LC2 of the second imaginary cylinder VC2, but does not contact the second positioning part 13e_2 on the second side (Y1 direction side). The fifth region RE5 does not contact the second positioning part 13e_2 on the first side (Y2 direction side) relative to the second center line LC2, but contacts the second positioning part 13e_2 on the second side (Y1 direction side). The sixth region RE6 does not contact the second positioning part 13e_2 on both the first side (Y2 direction side) and the second side (Y1 direction side) relative to the second center line LC2. The direction from the second region RE2 toward the first region RE1 is the same as the direction from the fifth region RE5 toward the fourth region RE4. Therefore, the second positioning pin 51b_2 has excellent insertion and removal properties relative to the second positioning part 13e_2, thus improving the ease of assembly and disassembly of the liquid injection head 1 relative to the support body 51.

[0155] Although the second positioning part 13e_2 is constituted by the second through hole 5, the third recess 6, and the fourth recess 7 in the first embodiment as described above, it is also possible to construct the second positioning part 13e_2 by only the second through hole 5 without providing the third recess 6 and the fourth recess 7. This is because the second positioning part 13e_2 is longer in the direction along the Y-axis, and the inclination angle of the spray surface FN when the second positioning pin 51b_2 is inserted into the second positioning part 13e_2 is smaller than the inclination angle of the spray surface FN when the first positioning pin 51b_1 is inserted into the first positioning part 13e_1, for the state where the liquid injection head 1 is supported on the support body 51. As a result, the construction of the second positioning part 13e_2 can be simplified.

[0156] Furthermore, in the first embodiment described above, since the first recess 3 and the second recess 4 are point-symmetric with respect to the center of the first positioning portion 13e_1, the maximum dimension D1_a of the first recess 3 along the Y-axis and the maximum dimension D1_b of the second recess 4 along the Y-axis are the same. Moreover, this maximum dimension D1_a is equal at any position on the X-axis. The same applies to the maximum dimension D1_b. Furthermore, since the third recess 6 and the fourth recess 7 are point-symmetric with respect to the center of the second positioning portion 13e_2, the maximum dimension D2_a of the third recess 6 along the Y-axis and the maximum dimension D2_b of the fourth recess 7 along the Y-axis are the same. Moreover, this maximum dimension D2_a is equal at any position on the X-axis. The same applies to the maximum dimension D2_b.

[0157] Furthermore, as described above, since the second positioning part 13e_2 is longer in the direction along the Y-axis, and the inclination angle of the spray surface FN when the second positioning pin 51b_2 is inserted into the second positioning part 13e_2 is smaller than the inclination angle of the spray surface FN when the first positioning pin 51b_1 is inserted into the first positioning part 13e_1, the maximum dimensions D2_a and D2_b can be made smaller than the maximum dimensions D1_a and D1_b, respectively, thereby enabling the size of the second positioning part 13e_2 in the Y-axis direction to be miniaturized.

[0158] like Figure 14 As shown, preferably, the gap G2 between the side of the liquid injection head 1 facing the Y1 direction and the inner peripheral surface of the opening 51a is greater than the gap G1 between the side of the liquid injection head 1 facing the Y2 direction and the inner peripheral surface of the opening 51a. Furthermore, preferably, the positioning part 13e is configured to be closer to the injection surface FN than the center of the liquid injection head 1 along the Z-axis. With this structure, the liquid injection head 1 can be easily assembled and disassembled relative to the support body 51 in an inclined manner relative to the extending direction of the first positioning pin 51b_1.

[0159] 2. Second Implementation Method

[0160] The second embodiment of this disclosure will now be described. The description will focus on the differences from the first embodiment. Furthermore, the second to sixth embodiments and variations 1 to 4 described later will be based on coordinate axes using a local coordinate system with the liquid injection head as the reference, similar to the first embodiment.

[0161] Figure 21 This is a diagram of the first positioning part 13e_1 of the liquid injection head according to the second embodiment, as viewed along the Z2 direction. Figure 22 for Figure 21 EE line section view. Figure 23 Observed along the Z1 direction Figure 21 The figure shows the first positioning part 13e_1. In this embodiment, the first positioning part 13e_1 is constructed in the same manner as the first positioning part 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 a first through hole 2, a first recess 3, and a second recess 4. Figures 21 to 23 The image shows a portion of a bracket 13A having a first through hole 2A, a first recess 3A, and a second recess 4A.

[0162] Except for its shape when viewed in plan view, the first through hole 2A is constructed in the same manner as the first through hole 2 in the first embodiment. The shape of the first through hole 2A when viewed in plan view is approximately square. Here, the first through hole 2A has one pair of sides along the Y-axis and one pair of sides along the X-axis when viewed in plan view. Furthermore, the length of the first through hole 2A along the Y-axis is equal to its length along the X-axis. "Approximately square" means, for example, a shape where the corners of a square are chamfered (R-angle or C-angle). Additionally, the shape of the first through hole 2A when viewed in plan view can be approximately quadrilateral, quadrilateral, or square.

[0163] exist Figure 21 In the diagram, the first imaginary cylinder VC1 is shown with a double-dotted line. In this embodiment, the first imaginary cylinder VC1 contacts the first positioning part 13e_1 at four points: both ends along the X-axis and both ends along the Y-axis. Specifically, when viewed in a planar view, the first region RE1 contacts the first positioning part 13e_1 at portions in the Y2, X1, and X2 directions relative to the first center line LC1, but does not contact the first positioning part 13e_1 at the portion in the Y1 direction relative to the first center line LC1. When viewed in a planar view, the second region RE2 contacts the first positioning part 13e_1 at the portion in the Y1 direction relative to the first center line LC1, but does not contact the first positioning part 13e_1 at portions in the Y2, X1, and X2 directions relative to the first center line LC1. When viewed in a plane, the third region RE3 contacts the first positioning part 13e_1 at various points on the X1 and X2 directions relative to the first center line LC1, but does not contact the first positioning part 13e_1 at various points on the Y1 and Y2 directions relative to the first center line LC1.

[0164] Therefore, the first contact portion CT1 and the second contact portion CT2 can make line contact with the first positioning pin 51b_1 shown in the first embodiment along the Z-axis direction. Thus, even with the shape of the first through hole 2A as seen in planar view, the movement of the first positioning portion 13e_1 relative to the first positioning pin 51b_1 in a plane orthogonal to the Z-axis can be restricted. Furthermore, the relationship between the length of the first through hole 2A along the Y-axis and the length of the first through hole 2A along the X-axis is determined by the shape of the first positioning pin 51b_1, etc., and is not particularly limited.

[0165] Except for the shape when viewed in plan view, the first recess 3A is constructed in the same manner as the first recess 3 in the first embodiment. The shape of the first recess 3A when viewed in plan view is approximately quadrilateral. Here, the first recess 3A has a long side along the Y1 direction of the first through hole 2A. Furthermore, the first recess 3A has one pair of sides along the Y-axis and one pair of sides along the X-axis when viewed in plan view. Additionally, the length of the first recess 3A along the Y-axis is shorter than the length of the first recess 3A along the X-axis. Furthermore, the length of the first recess 3A along the X-axis is equal to the length of the first through hole 2A along the X-axis. Moreover, these length relationships are not particularly limited.

[0166] Except for the shape when viewed in plan view, the second recess 4A is constructed in the same manner as the second recess 4 in the first embodiment. The shape of the second recess 4A when viewed in plan view is approximately C-shaped along the three sides of the first through hole 2A excluding the side in the Y1 direction.

[0167] According to the second embodiment described above, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0168] 3. Third Implementation Method

[0169] The third embodiment of this disclosure will now be described. The description will focus on the differences from the first embodiment.

[0170] Figure 24 This is a diagram of the first positioning part 13e_1 of the liquid injection head according to the third embodiment, as viewed along the Z2 direction. Figure 25 for Figure 24 FF line section view. Figure 26 Observed along the Z1 direction Figure 24 The figure shows the first positioning part 13e_1. In this embodiment, the first positioning part 13e_1 is constructed in the same manner as the first positioning part 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 a first through hole 2, a first recess 3, and a second recess 4. Figures 24 to 26 The image shows a portion of a bracket 13B having a first through hole 2B, a first recess 3B, and a second recess 4B.

[0171] Except for its shape when viewed in plan view, the first through hole 2B is constructed in the same manner as the first through hole 2 in the first embodiment. The shape of the first through hole 2B when viewed in plan view is a combination of a semicircle and a quadrilateral. Here, the first through hole 2B, when viewed in plan view, has a convex arc along a pair of sides along the Y-axis, a side connecting the end of the pair of sides along the Y-axis in the Y1 direction along the X-axis, and an end connecting the end of the pair of sides along the Y-axis in the Y2 direction. Figure 24 In the diagram, the first imaginary cylinder VC1 is shown with a double-dotted line. Based on the shape of the first through hole 2B as seen from this planar view, the movement of the first positioning part 13e_1 relative to the first positioning pin 51b_1 in a plane orthogonal to the Z-axis can also be restricted.

[0172] Except for the shape when viewed in plan view, the first recess 3B is constructed in the same manner as the first recess 3 in the first embodiment. The shape of the first recess 3B when viewed in plan view is semi-circular. The first positioning part 13e_1 has a first contact part CT1 that partially contacts the Y2 direction side of the first region RE1 relative to the first center line LC1.

[0173] Except for the shape when viewed in plan view, the second recess 4B is constructed in the same manner as the second recess 4 in the first embodiment. The shape of the second recess 4B when viewed in plan view is approximately C-shaped along the periphery of the first through hole 2B, excluding the edge in the Y1 direction. The first positioning part 13e_1 has a second contact part CT2 that partially contacts the second region RE2 on the Y1 direction side relative to the first center line LC1.

[0174] Even according to the third embodiment described above, it is possible to improve ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0175] 4. Fourth Implementation Method

[0176] The fourth embodiment of this disclosure will now be described. The description will focus on the differences from the first embodiment.

[0177] Figure 27 This is a diagram of the first positioning part 13e_1 of the liquid injection head according to the fourth embodiment, as viewed along the Z2 direction. Figure 28 as well as Figure 29 for Figure 27 The first positioning portion 13e_1 in this embodiment is constructed in the same manner as the first positioning portion 13e_1 in the first embodiment, except that it has a first recess 3C and a second recess 4C instead of a first recess 3 and a second recess 4C. Figures 27 to 29The image shows a portion of a bracket 13C having a first through hole 2, a first recess 3C, and a second recess 4C.

[0178] The first recess 3C is constructed in the same manner as the first recess 3 in the first embodiment, except that it is chamfered near the boundary with the first through hole 2. Similarly, the second recess 4C is constructed in the same manner as the second recess 4 in the first embodiment, except that it is chamfered near the boundary with the first through hole 2. Although these chamfers are shown as C-angles in the illustrations, they are not limited to this; for example, they could also be R-angles.

[0179] In this embodiment, the first positioning part 13e_1 includes a first contact part CT1 and a first inclined surface FL1. The first contact part CT1 contacts a first side (Y2 direction side) of the first region RE1 relative to the first centerline LC1. The first inclined surface FL1 is a surface continuous with the first contact part CT1 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis). Therefore, compared to a structure without the first inclined surface FL1 when the first positioning part 13e_1 is tilted relative to the extending direction of the first positioning pin 51b_1, the gap between the first positioning part 13e_1 and the first positioning pin 51b_1 can be increased. As a result, the ease of assembly and disassembly of the liquid injection head relative to the support body 51 can be improved.

[0180] Here, the first positioning part 13e_1 has a second contact part CT2 and a second inclined surface FL2. The second contact part CT2 contacts the second side (Y1 direction side) of the second region RE2 relative to the first centerline LC1. The second inclined surface FL2 is a surface continuous with the second contact part CT2 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis). Moreover, the first inclined surface FL1 and the second inclined surface FL2 are parallel to each other. With such a first inclined surface FL1 and the second inclined surface FL2, it is easy to ensure the wall thickness of the component constituting the first positioning part 13e_1. Alternatively, only either the first inclined surface FL1 or the second inclined surface FL2 may be provided in the first positioning part 13e_1.

[0181] Furthermore, the first inclined surface FL1 and the second inclined surface FL2 have portions that overlap when viewed along the second direction (along the Y-axis). Such first inclined surface FL1 and second inclined surface FL2 have the advantage of easily ensuring the wall thickness of the component constituting the first positioning part 13e_1. Although in this embodiment a portion of the first inclined surface FL1 and a portion of the second inclined surface FL2 overlap when viewed along the second direction (along the Y-axis), it is also possible for the entire first inclined surface FL1 and the entire second inclined surface FL2 to overlap when viewed along the second direction (along the Y-axis). Alternatively, the first inclined surface FL1 and the second inclined surface FL2 may not overlap when viewed along the second direction (along the Y-axis).

[0182] Furthermore, preferably, the lengths of the first inclined plane FL1 and the second inclined plane FL2 are the same. Additionally, as... Figure 28 As shown, preferably, a sidewall defining the second recess 4C of the first positioning portion 13e_1 is not provided on the extension line of the first inclined surface FL1, which extends along the first inclined surface FL1. Similarly, preferably, a sidewall defining the first recess 3C of the first positioning portion 13e_1 is not provided on the extension line of the second inclined surface FL2.

[0183] Furthermore, preferably, the angle θ1 formed by the first inclined plane FL1 and the straight line along the Z-axis is equal to the angle θ2 formed by the second inclined plane FL2 and the straight line along the Z-axis. Additionally, this angle θ1 is as follows: Figure 29 As shown, this can be expressed as the angle of rotation by taking the boundary between the first inclined plane FL1 and the first contact portion CT1 as the axis of rotation, and rotating the first inclined plane FL1 until it is parallel to the Z-axis, and this angle is acute. The resulting angle θ2 is also defined in the same way.

[0184] Furthermore, at the position where the length of the first imaginary cylinder VC1 along the second direction (along the Y-axis) is maximized when viewed along the first direction (along the Z-axis), the angle θ formed by the shortest line segment LS connecting the first contact part CT1 and the second contact part CT2 and the first inclined plane FL1 in the cross-section obtained by cutting the first positioning part 13e_1 with a plane parallel to both the first direction (along the Z-axis) and the second direction (along the Y-axis) is considered when viewed along the first direction (along the Z-axis) and the second direction (along the Y-axis). SThe angle is 90 degrees or more. Therefore, compared to a structure where the angle is less than 90 degrees when the first positioning part 13e_1 is tilted relative to the extending direction of the first positioning pin 51b_1, the gap between the first positioning part 13e_1 and the first positioning pin 51b_1 can be increased. As a result, the ease of assembly and disassembly of the liquid injection head relative to the support body 51 can be improved. In this embodiment, line segment LS is the line segment connecting the boundary portion of the first inclined surface FL1 and the first contact portion CT1, and the boundary portion of the second inclined surface FL2 and the second contact portion CT2.

[0185] The angle θ formed S In other words, it can be described as the rotation angle θ, which rotates the first inclined plane FL1 until it is parallel to the line segment LS, with the boundary between the first inclined plane FL1 and the first contact portion CT1 as the axis of rotation. S Preferably, it is approximately 90 degrees. This ensures the rigidity of the first positioning part 13e_1. Furthermore, approximately 90 degrees means 90 degrees ± 2 degrees, taking into account manufacturing tolerances. Also, approximately 90 degrees includes 90 degrees itself.

[0186] Figure 30 This is a diagram of the second positioning part 13e_2 of the liquid injection head according to the fourth embodiment, as viewed along the Z2 direction. Figure 31 as well as Figure 32 for Figure 30 The HH-line cross-sectional view in this embodiment. The second positioning portion 13e_2 of this embodiment is constructed 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. Figure 30 as well as Figure 31 The image shows a portion of a bracket 13C having a second through hole 5, a third recess 6C, and a fourth recess 7C.

[0187] The third recess 6C is constructed in the same manner as the third recess 6 of the first embodiment, except that a chamfer is applied near the boundary with the second through hole 5. Similarly, the fourth recess 7C is constructed in the same manner as the fourth recess 7 of the first embodiment, except that a chamfer is applied near the boundary with the second through hole 5. Furthermore, although these chamfers are shown as C-angles in the illustrations, they are not limited to this; for example, these chamfers could also be R-angles.

[0188] The second positioning part 13e_2 includes a third contact part CT3, a fourth contact part CT4, a third inclined surface FL3, and a fourth inclined surface FL4. The third contact part CT3 contacts the first side (Y2 direction side) of the fourth region RE4 relative to the second center line LC2, and the fourth contact part CT4 contacts the second side (Y1 direction side) of the fifth region RE5 relative to the second center line LC2. The third inclined surface FL3 is a surface continuous with the third contact part CT3 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis). The fourth inclined surface FL4 is a surface continuous with the fourth contact part CT4 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis).

[0189] Furthermore, preferably, the angle θ3 formed by the third inclined plane FL3 and the straight line along the Z-axis is equal to the angle θ4 formed by the fourth inclined plane FL4 and the straight line along the Z-axis. Furthermore, preferably, the angles θ3 and θ4 are smaller than the angles θ1 and θ2, respectively. This ensures the rigidity of the second positioning part 13e_2 without compromising the insertion and removal capability of the second positioning pin 51b_2 relative to the second positioning part 13e_2. Additionally, the angles θ3 and θ4 are defined in the same manner as the angle θ1.

[0190] According to the fourth embodiment described above, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0191] 5. Fifth Implementation Method

[0192] The fifth embodiment of this disclosure will now be described. The description will focus on the differences from the first embodiment.

[0193] Figure 33 This is a cross-sectional view showing the state in which the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1 of the liquid injection head according to the fifth embodiment. The first positioning portion 13e_1 of this embodiment is constructed in the same manner as the first positioning portion 13e_1 of the first embodiment, except that it is composed of a bottomed hole 8 having a bottom wall FB. Figure 33 The image shows a portion of a bracket 13D having a bottom hole 8.

[0194] The bottom hole 8 is a hole formed by combining a generally cylindrical bottom hole with a first center line LC1 as its central axis and an axis LL that is inclined relative to the first center line LC1 about the X-axis. The bottom hole 8 is formed on the hole-forming surface FO of the bracket 13D, opposite the protruding surface FP of the support body 51. Here, the first center line LC1 and the axis LL intersect, and this intersection point is located within the bottom hole 8. Figure 33 In the example shown, the depths of these bottom holes are equal. Furthermore, the cross-sectional shapes of these bottom holes are identical. Alternatively, the depths of these bottom holes may differ, and the cross-sectional shapes may also differ. The bottom wall FB of the generally cylindrical bottom hole with the first centerline LC1 as its central axis includes both curved and flat surfaces. Furthermore, the bottom wall FB of the generally cylindrical bottom hole with the axis LL as its center also includes both curved and flat surfaces. That is, the bottom wall FB of the bottom hole 8 in this embodiment is as follows... Figure 33 As shown, this includes curved surfaces and planes.

[0195] Thus, if the shape of the first positioning part 13e_1 is not a through hole but a bottom hole, and the bottom wall FB includes a curved surface, and the area of ​​the bottom wall FB when viewed in a plane along the Z-axis is smaller than the cross-sectional area of ​​the first positioning pin 51b_1 when viewed in a plane along the Z-axis, then the bottom wall FB is not provided within the range of the first positioning part 13e_1 for the insertion of the first positioning pin 51b_1. Therefore, it is not preferable to interpret such a bottom wall FB as the deepest position of the first positioning part 13e_1 into which the first imaginary cylinder VC1 is inserted. Therefore, in such a case, the deepest position of the first positioning part 13e_1 into which the first imaginary cylinder VC1 is inserted is preferably set as the top of the first positioning pin 51b_1 (the end of the first positioning pin 51b_1 in the Z1 direction).

[0196] As described above, when the deepest position of the first positioning portion 13e_1 inserted into the first imaginary cylinder VC1 is defined, the first region RE1 contacts the first positioning portion 13e_1 in the Y2 direction relative to the first centerline LC1, but does not contact it in the Y1 direction. The second region RE2 does not contact the first positioning portion 13e_1 in the Y2 direction relative to the first centerline LC1, but does contact it in the Y1 direction. The third region RE3 does not contact the first positioning portion 13e_1 in both the Y2 and Y1 directions relative to the first centerline LC1. Thus, the first positioning portion 13e_1 can be obtained by forming a bottomed hole 8 to the depth required for the insertion of the first positioning pin 51b_1. As a result, it has the advantage of easily improving the rigidity of the bracket 13D.

[0197] Furthermore, a first contact portion CT1, a second contact portion CT2, a first inclined surface FL1, and a second inclined surface FL2 are provided on the wall surface with the bottom hole 8. The first contact portion CT1 contacts the first region RE1, the second contact portion CT2 contacts the second region RE2, the first inclined surface FL1 is a surface continuous with the first contact portion CT1 and extends in a direction that does not orthogonally intersect the direction along the Z-axis, and the second inclined surface FL2 is a surface continuous with the second contact portion CT2 and extends in a direction that does not orthogonally intersect the direction along the Z-axis.

[0198] According to the fifth embodiment described above, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0199] 6. Sixth Implementation Method

[0200] The sixth embodiment of this disclosure will now be described. The description will focus on the differences from the first embodiment.

[0201] Figure 34 This is a cross-sectional view showing the state in which the first positioning pin 51b_1 is inserted into the first positioning portion 13e_1 of the liquid injection head according to the sixth embodiment. The first positioning portion 13e_1 of this embodiment is constructed in the same manner as the first positioning portion 13e_1 of the first embodiment, except that it is composed of a bottomed hole 8A having a bottom wall FB. Figure 34 The image shows a portion of a bracket 13D' having a bottom hole 8A. Figure 34 In the diagram, the first imaginary cylinder VC1 is represented by a rhombus-shaped shading.

[0202] A bottom hole 8A is formed on the hole-forming surface FO of the bracket 13D, which faces the protruding surface FP of the support body 51. In this embodiment, the bottom wall FB extends along an XY plane orthogonal to the Z-axis. The bottom hole 8A has a recess formed on the hole-forming surface FO, a cylindrical hole recessed into the bottom wall FB, and a space that cannot be visually observed through the hole-forming surface FO when viewed along the Z1 direction. Along the Y-axis, the cylindrical hole is located between the recess and the space that cannot be visually observed. Furthermore, when viewed along the Y-axis, the recess and the space that cannot be visually observed have overlapping portions.

[0203] The first region RE1 of the first imaginary cylinder VC1 contacts the first contact portion CT1 of the first positioning part 13e_1 in the Y2 direction relative to the first center line LC1, but does not contact the first positioning part 13e_1 in the Y1 direction. The second region RE2 contacts the second contact portion CT2 of the first positioning part 13e_1 in the Y1 direction relative to the first center line LC1, but does not contact the first positioning part 13e_1 in the Y2 direction. The third region RE3 does not contact the first positioning part 13e_1 in both the Y2 and Y1 directions relative to the first center line LC1.

[0204] The liquid injection head of this embodiment includes a bracket 13D' as an example of a "first component". The bracket 13D' serves as a first positioning part 13e_1 and has a bottomed hole 8A with a bottom wall FB. Furthermore, the deepest position into which the first imaginary cylinder VC1 is inserted is the bottom wall FB.

[0205] According to the sixth embodiment above, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0206] Furthermore, since the first through hole 2 shown in the first embodiment is a through hole for inserting the first positioning pin 51b_1, through holes provided at positions in the bottom wall FB where the first positioning pin 51b_1 cannot be inserted, for example, or small through holes formed on the bottom wall FB to the extent that the first positioning pin 51b_1 cannot be inserted, are not considered part of the first through hole 2. Therefore, when a through hole different from such a first through hole 2 is formed on the bottom wall FB, it is preferable to set the deepest position for inserting the first imaginary cylinder VC1 as the bottom wall FB.

[0207] 6. Variations

[0208] The methods illustrated above can be modified in many ways. Specific modifications applicable to the above methods are illustrated below. Two or more methods selected from the following examples may be appropriately combined within the scope of non-contradiction.

[0209] 6-1. Variation Example 1

[0210] Figure 35 The figure shows the first positioning part 13e_1 of the liquid injection head involved in the modified example 1 as observed along the Z2 direction. Figure 36 for Figure 35 The section view along line JJ in the image. Figure 37 Observed along the Z1 direction Figure 35The figure shows the first positioning portion 13e_1. In this modified example, the first positioning portion 13e_1 is constructed in the same manner as 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. Figures 35 to 37 The image shows a portion of a bracket 13E having a first through hole 2E, a first recess 3E, and a second recess 4E.

[0211] Specifically, the shape of the second recess 4E differs from that of the fourth embodiment in that the first inclined surface FL1 of this modified example extends from the connection portion of the first contact portion CT1 and the first inclined surface FL1 to the second surface F2. Similarly, the shape of the first recess 3E differs from that of the fourth embodiment in that the second inclined surface FL2 of this modified example extends from the connection portion of the second contact portion CT2 and the second inclined surface FL2 to the first surface F1.

[0212] Preferably, the length of the first inclined surface FL1 along the first direction (along the Z-axis) is greater than or equal to the combined lengths of the second region RE2 and the third region RE3 along the first direction (along the Z-axis). In this embodiment, the length of the first inclined surface FL1 along the first direction (along the Z-axis) is the same as the combined lengths of the second region RE2 and the third region RE3 along the first direction (along the Z-axis). Therefore, it has the advantage of easily ensuring the wall thickness of the component constituting the first positioning part 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 part 13e_1, resulting in improved ease of assembly and disassembly of the liquid injection head relative to the support body 51. Similarly, it is preferable that the length of the second inclined surface FL2 along the first direction (along the Z-axis) is greater than or equal to the combined lengths of the first region RE1 and the third region RE3 along the first direction (along the Z-axis).

[0213] Based on the above modified example 1, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head relative to the support 51.

[0214] 6-2. Variation Example 2

[0215] Figure 38 This is a plan view of the liquid injection head 1G involved in Modified Example 2. Figure 38 The liquid injection head 1G is schematically shown in the diagram. The liquid injection head 1G is configured in the same manner as the liquid injection head 1 of the first embodiment described above, except that it has a support 13G instead of a support 13.

[0216] The support 13G has a pair of flanges 13h that, when viewed in plan view, protrude in the Y1 and Y2 directions relative to the spray surface FN. The pair of flanges 13h extend along the X-axis, and the Z2-facing surfaces of each flange 13h contact the Z1-facing surface (protrusion surface FP) of the support 51. A first positioning portion 13e_1 and a second positioning portion 13e_2 are provided on the flange 13h_1 protruding from the spray surface FN in the Y2 direction, while no first positioning portion 13e_1 and a second positioning portion 13e_2 are provided on the flange 13h_2 protruding from the spray surface FN in the Y1 direction. Additionally, although not shown, a plurality of holes 13f are appropriately provided on the pair of flanges 13h.

[0217] In Modification 2, the first positioning portion 13e_1 and the second positioning portion 13e_2 are arranged 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_1 in the X1 direction. The direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are arranged is orthogonal to the direction along the Z-axis and intersects the direction along the Y-axis (orthogonal in this modification). The direction along the X-axis in this modification is an example of a "third direction". Furthermore, the injection surface FN is longer in the direction in which the first positioning portion 13e_1 and the second positioning portion 13e_2 are arranged, i.e., in the direction along the X-axis. Incidentally, for example, when a first positioning part 13e_1 is provided near the end of the flange part 13h_1 in the X2 direction and a second positioning part 13e_2 is provided near the end of the flange part 13h_2 in the X1 direction, the direction in which the first positioning part 13e_1 and the second positioning part 13e_2 are arranged is a direction that is orthogonal to the direction along the Z-axis and intersects the direction along the Y-axis but not orthogonal to it.

[0218] Here, the first positioning part 13e_1 and the second positioning part 13e_2 of Modified Example 2 will be described. Figure 39 The figure shows the first positioning part 13e_1 of the liquid injection head 1G involved in the modified example 2 as observed along the Z2 direction. Figure 40 for Figure 39 A cross-sectional view of the KK line. Figure 41 The figure shows the second positioning part 13e_2 of the liquid injection head involved in the modified example 2 as observed along the Z2 direction. Figure 42 for Figure 41The first positioning part 13e_1 of this modified example is configured in the same manner as the first positioning part 13e_1 of the first embodiment, except that its orientation around the Z-axis is different. Furthermore, the second positioning part 13e_2 of this modified example is configured in the same manner as the second positioning part 13e_2 of the first embodiment, except that its orientation around the Z-axis is different and its length along the X and Y axes is different.

[0219] In Modification 2, the first positioning part 13e_1 is configured in the same way as described above, that is, when viewed along the Z2 direction, the first positioning part 13e_1 of the first embodiment is rotated 90 degrees counterclockwise around the first center line LC1. In Modification 2, the second positioning part 13e_2 is configured in the same way as described above, that is, when viewed along the Z2 direction, the second positioning part 13e_2 of the first embodiment is rotated 90 degrees counterclockwise around the second center line LC2, and the long side direction of the second through hole 5 is set to be along the X-axis.

[0220] In Modification 2, the first positioning part 13e_1 has a first contact part CT1 that contacts the Y2 direction side of the first region RE1 relative to the first center line LC1, and a second contact part CT2 that contacts the Y1 direction side of the second region RE2 relative to the first center line LC1. Furthermore, the first positioning part 13e_1 does not contact the portion of the first region RE1 relative to the Y1 direction side of the first center line LC1, nor the portion of the second region RE2 relative to the Y2 direction side of the first center line LC1, and it does not contact the portions of the third region RE3 on both the Y1 and Y2 direction sides. Here, the direction along the Y-axis is an example of the "second direction," the Y2 direction side is an example of the "first side" in this modification, and the Y1 direction side is an example of the "second side" in this modification. Additionally, the direction along the Z-axis is an example of the "first direction."

[0221] In Modification 2, the second positioning part 13e_2 has a third contact part CT3 that contacts the Y2 direction side of the fourth region RE4 relative to the second center line LC2, and a fourth contact part CT4 that contacts the Y1 direction side of the fifth region RE5 relative to the second center line LC2. Furthermore, the second positioning part 13e_2 does not contact the portion of the fourth region RE4 relative to the Y1 direction side of the second center line LC2, nor the portion of the fifth region RE5 relative to the Y2 direction side of the second center line LC2, and it does not contact the portions of the sixth region RE6 on both the Y1 and Y2 direction sides.

[0222] Similar to the first embodiment, the injection surface FN of this modified liquid injection head 1G is positioned on the Y1 direction side when viewed from the first positioning portion 13e_1. Furthermore, the second region RE2 is positioned relative to the first region RE1 in the Z2 direction, which is the direction in which the injection surface FN faces. In other words, the second region RE2 is closer to the protruding surface FP in the Z-axis direction than the first region RE1. Additionally, when viewed from the first positioning portion 13e_1, the injection surface FN is not positioned on the Y2 direction side.

[0223] Furthermore, the injection surface FN of the liquid injection head 1G is positioned on the Y1 direction side when viewed from the second positioning part 13e_2. Additionally, the fifth region RE5 is positioned relative to the fourth region RE4 in the Z2 direction, which is the direction in which the injection surface FN faces. In other words, the fifth region RE5 is closer to the protruding surface FP in the Z-axis direction than the fourth region RE4. Moreover, the injection surface FN is not positioned on the Y2 direction side when viewed from the second positioning part 13e_2. In other words, the direction from the second region RE2 towards the first region RE1 (Z1 direction) is the same as the direction from the fifth region RE5 towards the fourth region RE4 (Z1 direction).

[0224] According to the above-described Modification 2, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head 1G relative to the support 51. Although the above embodiments illustrate a structure in which the liquid injection head is assembled and disassembled relative to the support 51 by tilting it about an axis along the short side of the liquid injection head, which is elongated when viewed in a plane, in Modification 2, the liquid injection head 1G can be assembled and disassembled relative to the support 51 by tilting it along the X-axis of the long side of the liquid injection head 1G.

[0225] 6-3. Variation Example 3

[0226] Figure 43 This is a plan view of the liquid injection head 1H according to Modification Example 3. The liquid injection head 1H is constructed in the same manner as the liquid injection head 1 of the first embodiment described above, except that it has a support 13H instead of a support 13.

[0227] The support 13H has a pair of flange portions 13h, which, when viewed in plan view, protrude in both the X1 and X2 directions relative to the spray surface FN near the end of the spray surface FN in the Y2 direction. The Z2-facing surfaces of each of the flange portions 13h contact the Z1-facing surface, i.e., the protruding surface FP, of the support body 51. A first positioning portion 13e_1 is provided on the flange portion 13h protruding in the X2 direction relative to the spray surface FN, and a second positioning portion 13e_2 is provided on the flange portion 13h protruding in the X1 direction relative to the spray surface FN. Additionally, although not shown, a plurality of holes 13f are appropriately provided on the pair of flange portions 13h.

[0228] In Modification 3, the first positioning part 13e_1 and the second positioning part 13e_2 are arranged in the direction along the X-axis. The direction in which the first positioning part 13e_1 and the second positioning part 13e_2 are arranged is orthogonal to the direction along the Z-axis and intersects the direction along the Y-axis (orthogonal in this modification). The direction along the X-axis in this modification is an example of a "third direction". Furthermore, the injection surface FN is longer in the direction in which the first positioning part 13e_1 and the second positioning part 13e_2 are arranged, i.e., along the X-axis.

[0229] Here, the first positioning part 13e_1 of Modification 3 is constructed in the same manner as the first positioning part 13e_1 of Modification 2 described above. Furthermore, the second positioning part 13e_2 of Modification 3 is constructed in the same manner as the second positioning part 13e_2 of Modification 2 described above. That is to say, the first positioning part 13e_1 of this modification is constructed in the same manner as the first positioning part 13e_1 of Modification 2, except for the difference in its position relative to the injection surface FN. Figure 39 as well as Figure 40 The first positioning part 13e_1 of the modified example 2 shown is the same. Specifically, in this modified example, the first region RE1, the third region RE3, and the second region RE2 are arranged sequentially in the Z2 direction, and the first contact part CT1 is located in the Y2 direction relative to the second contact part CT2. In addition, the second positioning part 13e_2 of this modified example is the same as the first positioning part 13e_1 in the modified example, except for the difference in the position of the second positioning part 13e_2 relative to the injection surface FN. Figure 41 as well as Figure 42 The second positioning part 13e_2 of the modified example 2 shown is the same. Specifically, in this modified example, the fourth region RE4, the sixth region RE6 and the fifth region RE5 are arranged sequentially in the Z2 direction, and the third contact part CT3 is located in the Y2 direction relative to the fourth contact part CT4.

[0230] The difference between the injection surface FN of the liquid injection head 1H in this modified example and that in modified example 2 is that it is positioned on the X1 direction side when viewed from the first positioning part 13e_1, and on the X2 direction side when viewed from the second positioning part 13e_2. Furthermore, the second region RE2 is positioned relative to the first region RE1 in the Z2 direction (the direction in which the injection surface FN faces) along the Z-axis, and the fifth region RE5 is positioned relative to the fourth region RE4 in the Z2 direction (the direction in which the injection surface FN faces) 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 Z-axis direction, and the fifth region RE5 is closer to the protruding surface FP than the fourth region RE4 in the Z-axis direction. Further, the direction (Z1 direction) from the second region RE2 towards the first region RE1 is the same as the direction (Z1 direction) from the fifth region RE5 towards the fourth region RE4. Furthermore, the positions of the first positioning part 13e_1 and the second positioning part 13e_2 on the Y-axis are closer to the Y2 direction than the center of the injection surface FN along the Y-axis direction; specifically, they are located at the same position as the end of the injection surface FN in the Y2 direction. Additionally, when viewed from the first positioning part 13e_1, the injection surface FN is not positioned on either the Y1 or Y2 direction side, and when viewed from the second positioning part 13e_2, the injection surface FN is not positioned on either the Y1 or Y2 direction side.

[0231] Based on the above variation 3, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head 1H relative to the support 51.

[0232] 6-4. Variation Example 4

[0233] Figure 44 This is a schematic diagram illustrating the assembly and disassembly of the liquid injection head 1I relative to the support body 51I according to Modified Example 4. While the above embodiments illustrate a structure where a first positioning pin 51b_1 and a second positioning pin 51b_2 are provided on the protruding surface FP of the support body 51 in the direction opposite to the direction of the injection surface FN (Z2 direction) (Z1 direction), in Modified Example 4, the first positioning pin 51b_1 and the second positioning pin 51b_2 are provided on the surface of the support body 51I in the direction in the same direction as the injection surface FN. Furthermore, the liquid injection head 1I is mounted on the support body 51I such that the side opposite to the injection surface FN is inserted into the opening 51a of the support body 51I.

[0234] Figure 45 This is a cross-sectional view of the first positioning part 13e_1 involved in Modification Example 4, and is consistent with the first embodiment. Figure 11 The corresponding diagram. Figure 46This is a cross-sectional view of the second positioning part 13e_2 involved in Modification Example 4, and is consistent with the first embodiment. Figure 19 The corresponding figure shows that a first positioning part 13e_1 and a second positioning part 13e_2 are provided on the flange portion 13h of the support 13I of the liquid injection head 1I in Modified Example 4. In this modified example, the first surface F1 of the flange portion 13h faces the Z2 direction, which is the same direction as the injection surface FN. The second surface F2 of the flange portion 13h faces the opposite direction, i.e., the Z1 direction, which is opposite to the direction of the injection surface FN. The second surface F2 is the surface opposite to the protruding surface FP of the support body 51I.

[0235] Although details will be described below, the first positioning part 13e_1 of Modification 4 has the same structure as the first positioning part 13e_1 of the first embodiment, except that the second region RE2, the third region RE3, and the first region RE1 are arranged sequentially in the direction (Z2 direction) towards which the injection surface FN faces. Regarding the second positioning part 13e_2 of Modification 4, it has the same structure as the second positioning part 13e_2 of the first embodiment, except that the fifth region RE5, the sixth region RE6, and the fourth region RE4 are arranged sequentially in the direction (Z2 direction) towards which the injection surface FN faces.

[0236] The first positioning part 13e_1 has: a first through hole 2I that penetrates the flange 13h in the direction along the Z-axis; a first recess 3I formed on the first surface F1; and a second recess 4I formed on the second surface F2. The second recess 4I, the first through hole 2I, and the first recess 3I are arranged sequentially in the Y1 direction. Furthermore, the side surface of the first imaginary cylinder VC1 provided in the first positioning part 13e_1 of this modified example includes a first region RE1, a second region RE2, and a third region RE3 disposed between the first region RE1 and the second region RE2, which are divided into three regions in the first direction (along the Z-axis). The second region RE2, the third region RE3, and the first region RE1 are arranged sequentially in the direction (Z2 direction) in which the spray surface FN faces. Although not shown, similar to the first embodiment, the shape of the first imaginary cylinder VC1 when viewed from a planar perspective is a perfect circle.

[0237] 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) of the second direction (along the Y-axis) relative to the first centerline LC1, but does not contact the first positioning portion 13e_1 at a portion on the second side (Y1 direction side) of the second direction (along the Y-axis) relative to the first centerline 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) of the second direction (along the Y-axis) relative to the first centerline LC1, but does not contact the first positioning portion 13e_1 at a portion on the first side (Y2 direction side) of the second direction (along the Y-axis) relative to the first centerline LC1. The third region RE3 does not contact the first positioning portion 13e_1 at portions on both the second side (Y1 direction side) and the first side (Y2 direction side) relative to the first centerline LC1.

[0238] The second positioning part 13e_2 has: a second through hole 5I that penetrates the flange 13h in the direction along the Z-axis; a third recess 6I formed on the first surface F1; and a fourth recess 7I formed on the second surface F2. The fourth recess 7I, the second through hole 5I, and the third recess 6I are arranged sequentially in the Y1 direction. Furthermore, the side surface of the second imaginary cylinder VC2 provided in the second positioning part 13e_2 of this modified example includes a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth region RE4 and the fifth region RE5, which are divided into three regions in the first direction (along the Z-axis). The fifth region RE5, the sixth region RE6, and the fourth region RE4 are arranged sequentially in the direction (Z2 direction) in which the spray surface FN faces. Although not shown, similar to the first embodiment, the shape of the second imaginary cylinder VC2 when viewed in planar view is an ellipse with the direction along the Y-axis as the long side direction.

[0239] The fourth region RE4 contacts the third contact portion CT3 of the second positioning part 13e_2 at the portion on the first side (Y2 direction side) relative to the second centerline LC2, but does not contact the second positioning part 13e_2 at the portion on the second side (Y1 direction side) relative to the second centerline LC2. The fifth region RE5 contacts the fourth contact portion CT4 of the second positioning part 13e_2 at the portion on the second side (Y1 direction side) relative to the second centerline LC2, but does not contact the second positioning part 13e_2 at the portion on the first side (Y2 direction side) relative to the second centerline LC2. The sixth region RE6 does not contact the second positioning part 13e_2 at portions on both the second side (Y1 direction side) and the first side (Y2 direction side) relative to the second centerline LC2.

[0240] Here, as Figure 44As shown, the spray surface FN is positioned on the second side (Y1 direction side) when viewed from the first positioning part 13e_1. Furthermore, the first region RE1 is positioned in the first direction (along the Z-axis direction) relative to the second region RE2 in the direction in which the spray surface FN faces (Z2 direction). In other words, the second region RE2 is positioned in the first direction (along the Z-axis direction) closer to the protruding surface FP of the support body 51I than the first region RE1. Similarly, when viewed from the second positioning part 13e_2, the spray surface FN is positioned on the first side (Y2 direction side), and the fourth region RE4 is positioned in the first direction (along the Z-axis direction) relative to the fifth region RE5 in the direction in which the spray surface FN faces (Z2 direction). In other words, the fifth region RE5 is positioned in the first direction (along the Z-axis direction) closer to the protruding surface FP of the support body 51I than the fourth region RE4. According to the above variation 5, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid spray head 1I relative to the support body 51I.

[0241] 6-5. Variation Example 5

[0242] Figure 47 This is a schematic diagram illustrating the assembly and disassembly of the liquid injection head 1J relative to the support body 51J according to Modified Example 5. The liquid injection head 1J is constructed in the same manner as the liquid injection 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 part 13e_1 and the second positioning part 13e_2. The support body 51J is constructed in the same manner as the support body 51 of the first embodiment, except that it has a first positioning part 51d_1 and a second positioning part 51d_2 instead of the first positioning pin 51b_1 and the second positioning pin 51b_2.

[0243] In Variation 5, the X, Y, and Z axes are coordinate axes of a local coordinate system based on the three-dimensionally arranged support body 51J. Therefore, in Figure 47 The diagram shows the coordinate axes of a local coordinate system based on the support body 51J when the liquid injection head 1J is supported on the support body 51J. Additionally, sometimes a local coordinate system based on the support body 51J when the liquid injection head 1J is supported on the support body 51J is used to describe structures other than the support body 51J, i.e., the liquid injection head 1J.

[0244] The first positioning pin 13g_1 and the second positioning pin 13g_2 are constructed in the same manner as the first positioning pin 51b_1 and the second positioning pin 51b_2. However, the first positioning pin 13g_1 and the second positioning pin 13g_2 protrude from the protruding surface FP in the Z2 direction. The protruding surface FP is a surface facing the same direction as the injection surface FN of the bracket 13J, i.e., the Z2 direction.

[0245] The first positioning part 51d_1 and the second positioning part 51d_2 are configured in the same manner as the first positioning part 13e_1 and the second positioning part 13e_2. The first positioning pin 13g_1 is inserted into the first positioning part 51d_1 relative to the support body 51J in the Z2 direction. Furthermore, the second positioning pin 13g_2 is inserted into the second positioning part 51d_2 relative to the support body 51J in the Z2 direction.

[0246] Figure 48 This is a cross-sectional view of the first positioning part 51d_1 involved in Modified Example 5, and is consistent with the first embodiment. Figure 11 The corresponding diagram. Figure 49 This is a cross-sectional view of the second positioning part 51d_2 involved in Modified Example 5, and is consistent with the first embodiment. Figure 19 The corresponding diagram shows that the support body 51J has a first surface F1 facing the Z2 direction in the same direction as the spray surface FN, and a second surface F2 facing the Z1 direction on the opposite side of the first surface F1. The second surface F2 of the support body 51J is opposite to the protruding surface FP of the liquid spray head 1J and is in contact with it.

[0247] The first positioning part 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 on the first surface F1 of the support body 51J; and a second recess 4J formed on the second surface F2 of the support body 51J. The second recess 4J, the first through hole 2J, and the first recess 3J are arranged sequentially in the Y1 direction.

[0248] The second positioning part 51d_2 has: a second through hole 5J that penetrates the support body 51J in the direction along the Z-axis; a third recess 6J formed on the first surface F1 of the support body 51J; and a fourth recess 7J formed on the second surface F2 of the support body 51J. The fourth recess 7J, the second through hole 5J, and the third recess 6J are arranged sequentially in the Y1 direction.

[0249] Here, the side surface of the first imaginary cylinder VC1, located in the first positioning part 51d_1, is divided into three regions in the first direction (along the Z-axis), including 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 part 51d_1 on one side (Y2 direction side) of a second direction (along the Y-axis direction) orthogonal to the first direction (along the Z-axis direction) relative to the first centerline LC1, which is the centerline of the first imaginary cylinder VC1, and does not contact the first positioning part 51d_1 on the other side (Y1 direction side) of the second direction (along the Y-axis direction). The second region RE2 does not contact the first positioning part 51d_1 on the first side (Y2 direction side) relative to the first centerline LC1, but contacts the first positioning part 51d_1 on the second side (Y1 direction side). The third region RE3 does not contact the first positioning part 51d_1 on both the first side (Y2 direction side) and the second side (Y1 direction side) relative to the first center line LC1. Furthermore, although not shown, similar to the first embodiment, the shape of the first imaginary cylinder VC1 when viewed from a plane is a perfect circle.

[0250] Furthermore, the side surface of the second imaginary cylinder VC2, located in the second positioning section 51d_2, is divided into three regions in the first direction (along the Z-axis), including a fourth region RE4, a fifth region RE5, and a sixth region RE6 disposed between the fourth and fifth regions RE4 and RE5. The fourth region RE4 contacts the second positioning section 51d_2 in the Y2 direction relative to the second centerline LC2, which is the centerline of the second imaginary cylinder VC2, but does not contact it in the Y1 direction. The fifth region RE5 does not contact the second positioning section 51d_2 in the Y2 direction relative to the second centerline LC2, but does not contact it in the Y1 direction. The sixth region RE6 does not contact the second positioning section 51d_2 in either the Y2 or Y1 direction relative to the second centerline LC2. Additionally, although not shown, similar to the first embodiment, the planar shape of the second imaginary cylinder VC2 is an ellipse with the direction along the Y-axis as its longer side.

[0251] Furthermore, the support body 51J has an opening 51a for inserting a portion of the liquid injection head 1J. In this modified example, a portion of the liquid injection head 1J, including the injection surface FN, is inserted into the opening 51a. The opening 51a is positioned on the second side (Y1 direction side) when viewed from the first positioning part 51d_1. Additionally, as shown in the first embodiment, when multiple liquid injection heads 1J are inserted into one opening 52a, the term "opening 51a" as used herein refers only to the space in the opening 51a into which one liquid injection head 1J is inserted. In other words, the opening 51a corresponding to the liquid injection head 1J is not positioned on the first side (Y2 direction side) when viewed from the first positioning part 51d_1. Moreover, the second region RE2 is positioned in the first direction (along the Z-axis direction) closer to the protruding surface FP of the first positioning pin 13g_1 of the liquid injection head 1J than the first region RE1.

[0252] Similarly, the opening 51a is positioned on the first side (Y2 direction side) when viewed from the second positioning part 51d_2. Although repeated, when multiple liquid injection heads 1J are inserted into one opening 51a, the term "opening 51a" as described here refers only to the space in the opening 51a into which one liquid injection head 1J is inserted. In other words, the opening 51a corresponding to the liquid injection head 1J is not positioned on the second side (Y1 direction side) when viewed from the second positioning part 51d_2. Furthermore, the fifth region RE5 is positioned in the first direction (along the Z-axis direction) closer to the protruding surface FP of the liquid injection head 1J than the fourth region RE4. In other words, the direction from the first region RE1 toward the second region RE2 (Z1 direction) is the same as the direction from the fourth region RE4 toward the fifth region RE5 (Z1 direction).

[0253] Alternatively, the first positioning portion 51d_1 may also have a first inclined surface FL1 and a second inclined surface FL2, similar to the first positioning portion 13e_1 in the fourth embodiment, fifth embodiment, or variation 1 described above. In this case, the first positioning portion 51d_1 includes a first contact portion CT1 and a first inclined surface FL1, wherein the first contact portion CT1 contacts a portion of the first region RE1 on a first side (Y2 direction side) relative to the first center line LC1, and the first inclined surface is a surface continuous with the first contact portion CT1 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis). Furthermore, the first positioning portion 51d_1 includes a second contact portion CT2 and a second inclined surface FL2, wherein the second contact portion CT2 contacts a portion of the second region RE2 on a second side (Y1 direction side) relative to the first center line LC1, and the second inclined surface FL2 is a surface continuous with the second contact portion CT2 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis).

[0254] Similarly, the second positioning part 51d_2 may also have a third inclined surface FL3 and a fourth inclined surface FL4, similar to the second positioning part 13e_2 of the fourth embodiment described above. In this case, the second positioning part 51d_2 includes a third contact part CT3, a fourth contact part CT4, a third inclined surface FL3, and a fourth inclined surface FL4, wherein the third contact part CT3 contacts a portion of the first region RE1 on the first side (Y2 direction side) relative to the second center line LC2, the fourth contact part CT4 contacts a portion of the fifth region RE5 on the second side (Y1 direction side) relative to the second center line LC2, the third inclined surface FL3 is a surface continuous with the third contact part CT3 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis), and the fourth inclined surface FL4 is a surface continuous with the fourth contact part CT4 and extends in a direction that does not orthogonally intersect the first direction (along the Z-axis).

[0255] As described above, the support body 51J includes a second positioning portion 51d_2, which positions the liquid injection head 1J by means of a second positioning pin 13g_2 inserted into the liquid injection head 1J. Furthermore, the first positioning portion 51d_1 and the second positioning portion 51d_2 are arranged in a second direction (along the Y-axis). Specifically, the second positioning portion 51d_2 is arranged in the Y1 direction relative to the first positioning portion 51d_1.

[0256] By using a liquid injection device with a support body 51J and a liquid injection head 1J as described in the above modified example 5, it is also possible to improve the ease of assembly and disassembly while ensuring the required positioning accuracy of the liquid injection head 1J relative to the support body 51J.

[0257] Furthermore, all or part of the above-described embodiments and variations, as well as combinations thereof, may be applied to the support 51J of this variation to the extent that no contradiction arises.

[0258] 6-6. Variation Example 6

[0259] Although the positioning pin is pressed into the positioning part by pressing in the above-described embodiments and modifications, this is not the only method. The positioning pin can also be inserted into the positioning part using a clearance fit to position the liquid injection head relative to the support. Here, a clearance fit in the positioning part means that the maximum length of the positioning pin observed in the depth direction of the positioning part is less than the diameter of the section perpendicular to the depth direction of an imaginary perfect cylinder that is inserted to the deepest position of the positioning part and has the largest cross-sectional area when viewed along the depth direction of the positioning part. That is, the insertion method can also be one where the positioning pin does not contact the positioning part, or where only one part of the positioning pin contacts the positioning part. Even with such an insertion method, the structure of the positioning part shown in the various embodiments and examples can improve the ease of assembly and disassembly of the liquid injection head relative to the support.

[0260] 6-7. Variation Example 7

[0261] Although the above-described embodiments and variations are so-called serial printers that perform printing by ejecting ink from liquid ejection heads while a carriage, including a support, reciprocates in a direction orthogonal to the transport direction DM of the medium M, they are not limited to this method. For example, a line printer equipped with a line head in which multiple liquid ejection heads are arranged in a direction orthogonal to the transport direction DM of the medium M, thereby making the printing area larger than the width of the direction orthogonal to the transport direction DM of the medium M. That is, the support can also be a print bar for supporting multiple liquid ejection heads to form a line head.

[0262] 6-8. Variation Example 8

[0263] The liquid jetting apparatus illustrated above can be used not only in printing equipment but also in various other devices such as fax machines and copiers. However, its applications are not limited to printing. For example, a liquid jetting apparatus for jetting solutions of color materials is used as a manufacturing apparatus for color filters in display devices such as liquid crystal display panels. Furthermore, a liquid jetting apparatus for jetting solutions of conductive materials is used as a manufacturing apparatus for wiring or electrodes in wiring substrates. Additionally, a liquid jetting apparatus for jetting solutions of organic substances related to living organisms is used, for example, as a manufacturing apparatus for biochips.

[0264] 7. Other methods:

[0265] This disclosure is not limited to the embodiments described above, and can be implemented in various ways without departing from its spirit. For example, this disclosure can also be implemented in the following aspects. In order to solve part or all of the problems of this disclosure, or to achieve part or all of the effects of this disclosure, the technical features in the above embodiments corresponding to the technical features in the various aspects described below can be appropriately replaced or combined. Furthermore, as long as the technical feature is not described as an essential technical feature in this specification, it can be appropriately deleted.

[0266] (1) According to a first aspect of the present disclosure, a liquid jet head is provided, which is a liquid jet head supported by a support having a first positioning pin and used for jetting liquid. It has a first positioning part, which positions the liquid jet head relative to the support by inserting the first positioning pin. When an imaginary cylinder that is inserted to the deepest position of the first positioning part and has the largest cross-sectional area when viewed along the depth direction of the first positioning part, i.e., the first direction, is defined as the first imaginary cylinder, the side of the first imaginary cylinder includes a first region, a second region, and a third region disposed between the first region and the second region as three regions divided in the first direction. The first region contacts the first positioning part on a first side of a second direction orthogonal to the first direction relative to a first center line which is the center line of the first imaginary cylinder, and does not contact the first positioning part on a second side which is the other side of the second direction. The second region does not contact the first positioning part on the first side relative to the first center line, but contacts the first positioning part on the second side. The third region does not contact the first positioning part on both the first side and the second side relative to the first center line.

[0267] (2) Alternatively, in the above method, it may also be configured to include a first component, the first component having the first positioning portion, the first component having a first surface and a second surface opposite to the first surface, the first positioning portion including: a first through hole that extends from the second surface to the first surface in the first direction; a first recess that is disposed on the first surface; a second recess that is disposed on the second surface, the first through hole being disposed between the first recess and the second recess in the second direction, and the first imaginary cylinder extending from the first surface to the second surface along the first through hole.

[0268] (3) In the above method, it can also be configured to include a first component, the first component having a bottom hole as the first positioning part, the bottom hole having a bottom wall, and the deepest position being the bottom wall.

[0269] (4) In the above manner, it can also be set such that the length of the first region along the first direction is equal to the length of the second region along the first direction.

[0270] (5) In the above manner, it can also be set such that the length of the first region and the second region along the first direction is more than 20% and less than 45% of the length of the first imaginary cylinder along the first direction.

[0271] (6) In the above manner, the first positioning part may also be configured to have: a first contact part that contacts the first side of the first region relative to the first center line; and a second contact part that contacts the second side of the second region relative to the first center line, wherein the first contact part and the second contact part extend continuously in the first direction.

[0272] (7) In the above manner, it may also be configured to include a spray surface having a plurality of nozzles for spraying liquid, wherein the spray surface is disposed on the second side when viewed from the first positioning part, and the second region is disposed in the direction in which the spray surface is oriented relative to the first region in the first direction.

[0273] (8) In the above manner, it may also be configured to include a spray surface having a plurality of nozzles for spraying liquid, wherein the spray surface is disposed on the second side when viewed from the first positioning part, and the first region is disposed in the direction in which the spray surface is oriented relative to the second region in the first direction.

[0274] (9) In the above manner, the first positioning part may also be configured to include: a first contact part that contacts the first side of the first region relative to the first center line; and a first inclined surface that is continuous with the first contact part and extends in a direction that does not orthogonally intersect with the first direction.

[0275] (10) In the above manner, it can also be set such that the length of the first inclined plane along the first direction is greater than or equal to the sum of the lengths of the second region and the third region along the first direction.

[0276] (11) In the above manner, the first positioning part may also be configured to have: a second contact part that contacts the second side of the second region relative to the first center line; a second inclined surface that is a surface continuous with the second contact part and extends in a direction that does not intersect the first direction, the first inclined surface and the second inclined surface being parallel to each other.

[0277] (12) In the above manner, it can also be set such that the first inclined plane and the second inclined plane have overlapping portions when viewed along the second direction.

[0278] (13) In the above manner, it can also be set that the first positioning part has a second contact part, the second contact part contacts the second side of the second region relative to the first center line, and in the position where the length of the first imaginary cylinder along the second direction is the largest when viewed along the first direction in a third direction orthogonal to the first direction and the second direction, the angle between the shortest connecting line segment of the first contact part and the second contact part and the first inclined plane is 90 degrees or more.

[0279] (14) In the above method, it can also be configured to include a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin disposed on the support body, and the first positioning part and the second positioning part are arranged in the second direction.

[0280] (15) In the above manner, the second positioning part may also be configured to be disposed on the second side relative to the first positioning part, and the second region in the first direction is configured to be closer to the protruding surface of the first positioning pin of the support than the first region.

[0281] (16) In the above manner, it can also be set up such that when the imaginary cylinder inserted to the deepest position of the second positioning part and whose cross-sectional area is the largest when viewed along the first direction is set as the second imaginary cylinder, the side of the second imaginary cylinder includes a fourth region, a fifth region and a sixth region disposed between the fourth region and the fifth region as three regions divided in the first direction. The fourth region contacts the second positioning part on the first side with respect to the second center line, which is the center line of the second imaginary cylinder, but does not contact the second positioning part on the second side. The fifth region does not contact the second positioning part on the first side with respect to the second center line, but contacts the second positioning part on the second side. The sixth region does not contact the second positioning part on both the first side and the second side with respect to the second center line. The direction from the second region toward the first region is the same as the direction from the fifth region toward the fourth region.

[0282] (17) In the above-described manner, it may also be configured to further include a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin disposed on the support body. The first positioning part and the second positioning part are arranged in a third direction orthogonal to the first direction and intersecting the second direction. When the imaginary cylinder inserted to the deepest position of the second positioning part and having the largest cross-sectional area when viewed along the first direction is designated as the second imaginary cylinder, the side of the second imaginary cylinder includes a fourth region, a fifth region, and a sixth region disposed between the fourth region and the fifth region as three regions divided in the first direction. The fourth region contacts the second positioning part on the first side relative to the second center line, which is the center line of the second imaginary cylinder, but does not contact the second positioning part on the second side. The fifth region does not contact the second positioning part on the first side relative to the second center line, but contacts the second positioning part on the second side. The sixth region does not contact the second positioning part on both the first side and the second side relative to the second center line. The direction from the second region toward the first region is the same as the direction from the fifth region toward the fourth region.

[0283] (18) According to the second aspect of the present disclosure, a liquid injection device can be provided, the liquid injection device comprising: a liquid injection head of the above-described manner; and a support having the first positioning pin.

[0284] (19) In the above manner, the first positioning part may also be configured such that: the first contact part contacts the first side of the first region relative to the first center line; the second contact part contacts the second side of the second region relative to the first center line, and in a position in the third direction orthogonal to the first direction, when viewed along the first direction, the length of the first imaginary cylinder along the second direction is the largest, and in a cross section obtained by cutting the first positioning part with a plane along both the first and second directions, the shortest distance between the first contact part and the second contact part is greater than or equal to the maximum length of the first positioning pin along the second direction.

[0285] (20) According to a third aspect of the present disclosure, a support body is provided, which is a support body for supporting a liquid spray head that sprays liquid. The support body has a first positioning part, which positions the liquid spray head relative to the support body by inserting a first positioning pin disposed on the liquid spray head. When an imaginary cylinder that is inserted to the deepest position of the first positioning part and has the largest cross-sectional area when viewed along the depth direction of the first positioning part, i.e., the first direction, is defined as the first imaginary cylinder, the side of the first imaginary cylinder includes a first region, a second region, and a third region disposed between the first region and the second region as three regions divided in the first direction. The first region contacts the first positioning part on a first side, i.e., a first side, of a second direction orthogonal to the first direction, relative to a first center line which is the center line of the first imaginary cylinder, and does not contact the first positioning part on the other side, i.e., a second side, of the second direction. The second region does not contact the first positioning part on the first side, but contacts the first positioning part on the second side, relative to the first center line. The third region does not contact the first positioning part on both the first side and the second side, relative to the first center line.

[0286] (21) According to the above method, it can also be configured to have an opening for a portion of the liquid injection head to be inserted, and the opening is positioned on the second side when viewed from the first positioning part.

[0287] (22) According to the above method, the first positioning part may also be configured to include: a first contact part that contacts the first side of the first region relative to the first center line; and a first inclined surface that is continuous with the first contact part and extends in a direction that does not orthogonally intersect with the first direction.

[0288] (23) According to the above method, it can also be configured to further include a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin provided on the liquid injection head, and the first positioning part and the second positioning part are arranged in the second direction.

[0289] (24) According to the fourth aspect of this disclosure, a liquid injection device can be provided, the liquid injection device comprising: a support body of the above-described manner; and a liquid injection head having the first positioning pin.

[0290] (25) According to a fifth aspect of the present disclosure, a liquid jet head is provided, the liquid jet head being supported by a support having a first positioning pin and used for jetting liquid, comprising a first component having a first positioning portion for positioning the liquid jet head relative to the support by inserting the first positioning pin, the first component having a first surface and a second surface opposite to the first surface, the first positioning portion comprising: a first through hole extending from the second surface to the first surface in a first direction; a first recess disposed on the first surface; and a second recess disposed on the second surface, the first through hole being disposed between the first recess and the second recess in a second direction orthogonal to the first direction, a portion of the first recess and a portion of the second recess overlapping each other when viewed along the second direction.

[0291] Symbol Explanation

[0292] 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…The…Second through hole; Three recesses; 7… Fourth recess; 7C… Fourth recess; 8… Bottom hole; 10… Liquid container; 13… Support; 13A… Support; 13B… Support; 13C… Support; 13D… Support; 13E… Support; 13G… Support; 13H… Support; 13e… Positioning part; 13e_1… First positioning part; 13e_2… Second positioning part; 13g_1… First positioning pin; 13g_2… Second positioning pin; 14… Fixing plate; 14a… Opening; 20… Control unit; 30… Conveying mechanism; 4 0…Moving mechanism; 41…Conveying body; 42…Conveyor belt; 50…Head module; 51…Support body; 51I…Support body; 51J…Support body; 51a…Opening; 51b…Positioning pin; 51b_1…First positioning pin; 51b_2…Second positioning pin; 51d_1…First positioning part; 51d_2…Second positioning part; 60…Circulation mechanism; 100…Liquid injection device; CT1…First contact part; CT2…Second contact part; CT3…Third contact part; CT4…Fourth contact part; DM …Conveying direction; F1…First surface; F2…Second surface; FB…Bottom wall; FL1…First inclined surface; FL2…Second inclined surface; FN…Spray surface; FP…Protruding surface; HC…Head chip; LC1…First center line; LC2…Second center line; LL…Axis; M…Media; 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 injection head, characterized in that, Supported by a support body with a first locating pin and used for spraying liquid, The liquid injection head includes a first positioning part, which positions the liquid injection head relative to the support body by inserting a first positioning pin. When the imaginary cylinder that is inserted to the deepest position of the first positioning part and has the largest cross-sectional area when viewed along the depth direction of the first positioning part, i.e., the first direction, is defined as the first imaginary cylinder, The side surface of the first imaginary cylinder includes a first region, a second region, and a third region disposed between the first region and the second region as three regions divided in the first direction. The first region, relative to the centerline of the first imaginary cylinder (i.e., the first centerline), contacts the first positioning part on one side (i.e., the first side) of the second direction orthogonal to the first direction, and does not contact the first positioning part on the other side (i.e., the second side) of the second direction. The second region, relative to the first centerline, does not contact the first positioning part on the first side, but contacts the first positioning part on the second side. The third region, relative to the first centerline, does not contact the first positioning part on either the first side or the second side.

2. The liquid injection head as described in claim 1, characterized in that, It includes a first component, the first component having the first positioning part. The first component has a first surface and a second surface opposite to the first surface. The first positioning unit includes: A first through hole extends from the second surface to the first surface in the first direction; A first recess is provided on the first surface; The second recess is provided on the second surface. The first through hole is disposed in the second direction between the first recess and the second recess. The first imaginary cylinder extends along the first through hole from the first surface to the second surface.

3. The liquid injection head as described in claim 1, characterized in that, The device includes a first component having a bottomed hole serving as a first positioning part, the bottomed hole having a bottom wall. The deepest location is the bottom wall.

4. The liquid injection head according to any one of claims 1 to 3, characterized in that, The length of the first region along the first direction is equal to the length of the second region along the first direction.

5. The liquid injection head as described in claim 1, characterized in that, The length of each of the first region and the second region along the first direction is more than 20% and less than 45% of the length of the first imaginary cylinder along the first direction.

6. The liquid injection head as described in claim 1, characterized in that, The first positioning part has: The first contact portion contacts the first side of the first region relative to the first centerline; The second contact portion contacts the second side of the second region relative to the first centerline. The first contact portion and the second contact portion each extend continuously in the first direction.

7. The liquid injection head as claimed in claim 1, characterized in that, It has a spray surface, which has multiple nozzles for spraying liquid. The spray surface is positioned on the second side when viewed from the first positioning part. The second region is positioned relative to the first region in the direction in which the spray surface faces.

8. The liquid injection head as described in claim 1, characterized in that, It has a spray surface, which has multiple nozzles for spraying liquid. The spray surface is positioned on the second side when viewed from the first positioning part. The first region is positioned relative to the second region in the direction in which the spray surface faces.

9. The liquid injection head as claimed in claim 1, characterized in that, The first positioning unit includes: The first contact portion contacts the first side of the first region relative to the first centerline; The first inclined surface is a surface continuous with the first contact portion and extends in a direction that does not orthogonally intersect the first direction.

10. The liquid injection head as described in claim 9, characterized in that, The length of the first inclined plane along the first direction is greater than or equal to the sum of the lengths of the second region and the third region along the first direction.

11. The liquid injection head as described in claim 9 or 10, characterized in that, The first positioning part has: The second contact portion contacts the second side of the second region relative to the first centerline; The second inclined surface is a surface continuous with the second contact portion and extends in a direction that does not orthogonally intersect the first direction. The first inclined plane and the second inclined plane are parallel to each other.

12. The liquid injection head as claimed in claim 11, characterized in that, The first inclined plane and the second inclined plane have overlapping portions when viewed along the second direction.

13. The liquid injection head as described in claim 9, characterized in that, The first positioning part has a second contact part, which contacts the second side of the second region relative to the first center line. In a third upward position orthogonal to both the first and second directions, at the position where the length of the first imaginary cylinder along the second direction is the greatest when viewed along the first direction, the first positioning part is cut off by a plane parallel to both the first and second directions. The angle between the shortest connecting line segment of the first contact portion and the second contact portion and the first inclined plane is 90 degrees or more.

14. The liquid injection head as claimed in claim 1, characterized in that, It also includes a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin disposed on the support body. The first positioning part and the second positioning part are arranged in the second direction.

15. The liquid injection head as claimed in claim 14, characterized in that, The second positioning part is disposed on the second side relative to the first positioning part. The second region is configured in the first direction to be closer than the first region to the protruding surface of the first locating pin of the support.

16. The liquid injection head as described in claim 14 or 15, characterized in that, When the imaginary cylinder that is inserted to the deepest position of the second positioning part and has the largest cross-sectional area when viewed along the first direction is designated as the second imaginary cylinder, The side surface of the second imaginary cylinder includes a fourth region, a fifth region, and a sixth region disposed between the fourth region and the fifth region as three regions divided in the first direction. The fourth region, relative to the centerline of the second imaginary cylinder (i.e., the second centerline), contacts the second positioning part on the first side, but does not contact the second positioning part on the second side. The fifth region, relative to the second centerline, does not contact the second positioning part on the first side, but does contact the second positioning part on the second side. The sixth region, relative to the second centerline, does not contact the second positioning part on either the first side or the second side. The direction from the second region toward the first region is the same as the direction from the fifth region toward the fourth region.

17. The liquid injection head as claimed in claim 1, characterized in that, It also includes a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin disposed on the support body. The first positioning part and the second positioning part are arranged in a third-direction upward orientation, which is orthogonal to the first direction and intersects the second direction. When the imaginary cylinder that is inserted to the deepest position of the second positioning part and has the largest cross-sectional area when viewed along the first direction is designated as the second imaginary cylinder, The side surface of the second imaginary cylinder includes a fourth region, a fifth region, and a sixth region disposed between the fourth region and the fifth region as three regions divided in the first direction. The fourth region, relative to the centerline of the second imaginary cylinder (i.e., the second centerline), contacts the second positioning part on the first side, but does not contact the second positioning part on the second side. The fifth region, relative to the second centerline, does not contact the second positioning part on the first side, but does contact the second positioning part on the second side. The sixth region, relative to the second centerline, does not contact the second positioning part on either the first side or the second side. The direction from the second region toward the first region is the same as the direction from the fifth region toward the fourth region.

18. A liquid injection device, characterized in that, have: The liquid injection head according to any one of claims 1 to 17; The support body has the first positioning pin.

19. The liquid injection device as claimed in claim 18, characterized in that, The first positioning part has: a first contact part that contacts the first side of the first region relative to the first center line; The second contact portion contacts the second side of the second region relative to the first centerline. In a third upward position orthogonal to both the first and second directions, at the position where the length of the first imaginary cylinder along the second direction is the greatest when viewed along the first direction, the first positioning part is cut off by a plane along both the first and second directions. The shortest distance between the first contact portion and the second contact portion is greater than or equal to the maximum length of the first locating pin along the second direction.

20. A support body, characterized in that, Support the liquid injection head for spraying liquid. The support body has a first positioning part, which positions the liquid injection head relative to the support body by inserting a first positioning pin disposed on the liquid injection head. When the imaginary cylinder that is inserted to the deepest position of the first positioning part and has the largest cross-sectional area when viewed along the depth direction of the first positioning part, i.e., the first direction, is defined as the first imaginary cylinder, The side surface of the first imaginary cylinder includes a first region, a second region, and a third region disposed between the first region and the second region as three regions divided in the first direction. The first region, relative to the centerline of the first imaginary cylinder (i.e., the first centerline), contacts the first positioning part on one side (i.e., the first side) of the second direction orthogonal to the first direction, and does not contact the first positioning part on the other side (i.e., the second side) of the second direction. The second region, relative to the first centerline, does not contact the first positioning part on the first side, but contacts the first positioning part on the second side. The third region, relative to the first centerline, does not contact the first positioning part on either the first side or the second side.

21. The support body as claimed in claim 20, characterized in that, It has an opening into which a portion of the liquid injection head is inserted. The opening is positioned on the second side when viewed from the first positioning portion.

22. The support body as claimed in claim 20 or 21, characterized in that, The first positioning unit includes: The first contact portion contacts the first side of the first region relative to the first centerline. The first inclined surface is a surface continuous with the first contact portion and extends in a direction that does not orthogonally intersect the first direction.

23. The support body as claimed in claim 20, characterized in that, It also includes a second positioning part, which positions the liquid injection head relative to the support body by inserting a second positioning pin disposed on the liquid injection head. The first positioning part and the second positioning part are arranged in the second direction.

24. A liquid injection device, characterized in that, have: The support body according to any one of claims 20 to 23; A liquid injection head, which has the first positioning pin.

25. A liquid injection head, characterized in that, Supported by a support body with a first locating pin and used for spraying liquid, The liquid injection head includes a first component, the first component having a first positioning portion that positions the liquid injection head relative to the support body by inserting the first positioning pin. The first component has a first surface and a second surface opposite to the first surface. The first positioning unit includes: A first through hole extends from the second surface to the first surface in a first direction; A first recess is provided on the first surface; The second recess is provided on the second surface. The first through hole is disposed between the first recess and the second recess in a second direction orthogonal to the first direction. A portion of the first recess and a portion of the second recess overlap when viewed along the second direction.

26. A support body, characterized in that, Support the liquid injection head for spraying liquid. The support body has a first positioning part, a first surface, and a second surface opposite to the first surface. The first positioning part positions the liquid injection head relative to the support body by inserting a first positioning pin disposed on the liquid injection head. The first positioning unit includes: A first through hole extends from the second surface to the first surface in a first direction; A first recess is provided on the first surface; The second recess is provided on the second surface. The first through hole is disposed between the first recess and the second recess in a second direction orthogonal to the first direction. A portion of the first recess and a portion of the second recess overlap when viewed along the second direction.

Images