Liquid ejecting apparatus and method of fixing liquid ejecting head

Abstract

The present application provides a liquid ejecting apparatus and a method of fixing a liquid ejecting head, which can fix the liquid ejecting head to a holding member with a simple structure. The liquid ejecting apparatus includes a liquid ejecting head that ejects liquid; a holding member that holds the liquid ejecting head; a fixing member that has a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion; and an elastic member that has a first opening portion through which the shaft portion is inserted, one of the liquid ejecting head and the holding member has a second opening portion through which the shaft portion is inserted, and the other has a first engaged portion that engages with the engaging portion, and the liquid ejecting head and the holding member are fixed by engaging the engaging portion and the first engaged portion in a manner that sandwiches the first opening portion and the second opening portion between the head portion and the engaging portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid ejecting apparatus and a fixing method of a liquid ejecting head. BACKGROUND

[0002] Conventionally, a liquid ejecting apparatus that ejects a liquid such as ink, typified by a printer in an inkjet system, has been known.

[0003] The liquid ejecting apparatus described in Patent Document 1 is provided with a plurality of head bodies that eject ink and a unit base that holds the plurality of head bodies. Each head body is fixed to the unit base via a gasket by a plurality of screw members.

[0004] However, in the method of fixing the head body to the unit base by the plurality of screw members, there is a problem that the installation and replacement of the head body are not simple. Therefore, a liquid ejecting apparatus that can simply fix the head body to the unit base is desired.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-149684 SUMMARY

[0006] One embodiment of the liquid ejecting apparatus of the present disclosure is provided with a liquid ejecting head that ejects a liquid, a holding member that holds the liquid ejecting head, a fixing member that has a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion, and an elastic member that has a first opening portion into which the shaft portion is inserted, one of the liquid ejecting head and the holding member has a second opening portion into which the shaft portion is inserted, and the other has a first engaged portion that engages with the engaging portion, and the liquid ejecting head and the holding member are fixed by engaging the engaging portion and the first engaged portion in a manner that sandwiches the first opening portion and the second opening portion between the head portion and the engaging portion.

[0007] One embodiment of the fixing method of the liquid ejecting head of the present disclosure fixes a liquid ejecting head to a holding member using a fixing member that has a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion, and an elastic member that is provided with a first opening portion into which the shaft portion is inserted and abuts against the head portion, in the fixing method of the liquid ejecting head, one of the liquid ejecting head and the holding member has a second opening portion into which the shaft portion is inserted, and the other has a first engaged portion that engages with the engaging portion, and the liquid ejecting head is fixed to the holding member by pressing the elastic member with the head portion and engaging the engaging portion and the first engaged portion in a manner that sandwiches the first opening portion and the second opening portion between the head portion and the engaging portion. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a schematic diagram showing an outline of a structure example of a liquid ejecting apparatus according to the first embodiment.

[0009] Figure 2 is a plan view of a head unit of Figure 1

[0010] Figure 3 is a diagram showing an enlarged view of a part of the head unit of Figure 2

[0011] Figure 4 is a cross section taken along the A-A line of Figure 3

[0012] Figure 5 is an exploded perspective view of Figure 4

[0013] Figure 6 is an exploded perspective view of the liquid ejecting head shown in Figure 4

[0014] Figure 7 is an enlarged view of the fixing member, the elastic member, the liquid ejecting head, and the holder member shown in Figure 5

[0015] Figure 8 is an exploded perspective view of the fixing member, the elastic member, the liquid ejecting head, and the holder member shown in Figure 5

[0016] Figure 9 is a cross-sectional view of the fixing member, the elastic member, the liquid ejecting head, and the holder member shown in Figure 5

[0017] Figure 10 is a cross-sectional view of the fixing member shown in Figure 7

[0018] Figure 11 is a plan view of the elastic member shown in Figure 7

[0019] Figure 12 is a plan view of the first flange portion possessed by the holder shown in Figure 7

[0020] Figure 13 is a perspective view of the engaged member shown in Figure 7

[0021] Figure 14 is a cross-sectional view of the engaged member shown in Figure 7

[0022] ​​​​​​​​​​​​​Figure 15 Fig. 1 is a perspective view showing a liquid ejecting head according to an embodiment of the present application. Figure 7 Fig. 2 is a plan view showing a clamping member.

[0023] Figure 16 Fig. 3 is a view for explaining fixation of an elastic member to the liquid ejecting head.

[0024] Figure 17 Fig. 4 is a view for explaining fixation of an elastic member to the liquid ejecting head.

[0025] Figure 18 Fig. 5 is a view for explaining fixation of the liquid ejecting head to a holding member.

[0026] Figure 19 Fig. 6 is a view for explaining fixation of the liquid ejecting head to the holding member.

[0027] Figure 20 Fig. 7 is a view for explaining fixation of the liquid ejecting head to the holding member.

[0028] Figure 21 Fig. 8 is a perspective view showing a fixing member of a second embodiment.

[0029] Figure 22 Fig. 9 is a sectional view showing the fixing member of the third embodiment.

[0030] Figure 23 Fig. 10 is a sectional view showing a state in which the fixing member of the third embodiment is disassembled.

[0031] Figure 24 Fig. 11 is a view schematically showing a liquid ejecting head and a holding member of a first modification example.

[0032] Figure 25 Fig. 12 is a view showing arrangement of the liquid ejecting head and the holding member of the first embodiment.

[0033] Figure 26 Fig. 13 is a view schematically showing arrangement of a liquid ejecting head and a holding member of a second modification example.

[0034] Figure 27 Fig. 14 is a view schematically showing a liquid ejecting head and a holding member of a third modification example.

[0035] Figure 28 Fig. 15 is a view schematically showing a liquid ejecting head and a holding member of a fourth modification example.

[0036] Figure 29 Fig. 16 is a view schematically showing a holding member of a fifth modification example.

[0037] Figure 30 Fig. 17 is a view schematically showing a fixing member and a liquid ejecting head of a sixth modification example.

[0038] Figure 31 For Figure 32 A plan view of the fixing member and the first flange portion of the liquid ejection head shown in FIG. 1.

[0039] Figure 33 A view for schematically showing the elastic member of the seventh modification.

[0040] Figure 34 A view for schematically showing the elastic member of the eighth modification.

[0041] Figure 35 A plan view of the fixing member of the ninth modification.

[0042] Figure 1 A schematic view of the liquid ejection apparatus of the tenth modification. DETAILED DESCRIPTION

[0043] Hereinafter, modes for carrying out the present application will be described with reference to the drawings. However, in each drawing, the size and the scale of each portion are appropriately different from the actual situation. Further, although the following described embodiments are preferred specific examples of the present application and are accompanied by various limitations that are technically preferred, the scope of the present application is not limited to these modes insofar as there is no description of the meaning of the limitation of the present application.

[0044] In the following description, X axis, Y axis and Z axis orthogonal to each other are appropriately used for the description. Further, one direction along the X axis is labeled as XI direction, and the direction opposite to the XI direction is labeled as X2 direction. Similarly, one direction along the Y axis is labeled as Yl direction, and the direction opposite to the Yl direction is labeled as Y2 direction. One direction along the Z axis is labeled as Zl direction, and the direction opposite to the Zl direction is labeled as Z2 direction. Further, the case where observation is made in the Zl direction or the Z2 direction is set as "planar observation". Further, the case where a surface cut by a surface including the Z axis is observed from a direction orthogonal to the Z axis is set as "cross-sectional observation". Further, the direction along the Z axis corresponds to the direction of gravity. The Zl direction corresponds to "below in the direction of gravity", and the Z2 direction corresponds to "above in the direction of gravity".

[0045] 1. First Embodiment

[0046] 1-1. Overall structure of liquid ejection apparatus 100

[0047] Figure 1 A schematic view of a structure example of the liquid ejection apparatus 100 according to the first embodiment. Figure 1The liquid ejecting apparatus 100 shown is a printing apparatus of an inkjet method that ejects "liquid" exemplified by ink as droplets toward a medium PP. The liquid ejecting apparatus 100 of the present embodiment is a so-called line-type printing apparatus in which a plurality of nozzles that eject ink are distributed across the entire range in the width direction of the medium PP. The medium PP is typically printing paper, but any material can be used as the medium PP, such as a resin film or cloth.

[0048] Figure 2 The liquid ejecting apparatus 100 shown is provided with a circulation mechanism 92, a control unit 93, a medium conveying mechanism 94, and a head unit 10. The head unit 10 has a plurality of liquid ejecting heads 1. In addition, a liquid container 91 is provided in the liquid ejecting apparatus 100.

[0049] The liquid container 91 is a liquid storage portion that stores ink. In the liquid container 91, for example, a cartridge that is detachable with respect to the liquid ejecting apparatus 100, a bag-shaped ink pack formed of a flexible film, or an ink tank that can be replenished with ink can be used. The kind of ink stored in the liquid container 91 is arbitrary. The liquid container 91, for example, includes a plurality of containers that store mutually different kinds of ink.

[0050] The circulation mechanism 92 supplies the ink stored in the liquid container 91 to the liquid ejecting head 1. Specifically, the circulation mechanism 92 supplies the ink stored in the liquid container 91 to the liquid ejecting head 1, and recovers the ink discharged from the liquid ejecting head 1 to return it to the liquid ejecting head 1 again. The circulation mechanism 92, for example, includes a flow path for supplying the ink to the liquid ejecting head 1, a flow path for recovering the ink discharged from the liquid ejecting head 1, a sub-tank for storing the recovered ink, and a pump or the like for transferring the ink.

[0051] The control unit 93 is a control device that controls the operation of each element included in the liquid ejecting apparatus 100. The control unit 93, for example, includes a processing circuit such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array), and a storage circuit such as a semiconductor memory. Various programs and various data are stored in the storage circuit. The processing circuit realizes various controls by executing the programs and appropriately using the data.

[0052] The medium conveying mechanism 94 is controlled by the control unit 93 and conveys the medium PP in the conveying direction DM. The conveying direction DM is, for example, the Y1 direction. The conveying direction DM is not limited to the Y1 direction and may be another direction. The medium conveying mechanism 94 includes an elongated conveying roller along the X-axis and a motor that rotates the conveying roller. The medium conveying mechanism 94 is not limited to a structure using conveying rollers; for example, a structure using a roller or an endless belt that conveys the medium PP while the medium PP is attracted to the outer peripheral surface by electrostatic force or the like may also be employed.

[0053] The head unit 10 is a line head with multiple liquid ejecting heads 1 arranged along the X-axis. The liquid ejecting heads 1 eject ink from multiple nozzles onto the medium PP under the control of a control unit 93. As the medium PP is transported by the medium transport mechanism 94, each liquid ejecting head 1 ejects ink onto the medium PP, thereby forming an image on the surface of the medium PP.

[0054] 1-2. Head unit 10

[0055] Figure 1 for Figure 3 10 is a plan view of the head unit 10. Figure 2 For the general Figure 4 FIG. 1 is an enlarged view of a portion of the head unit 10 . Figure 3 Equivalent to Figure 5 AA line section. Figure 4 for Figures 2 to 5 Exploded three-dimensional diagram.

[0056] like Figure 2 As shown, the head unit 10 includes a holding member 2 , a plurality of fixing members 3 , and a plurality of elastic members 4 in addition to the plurality of liquid ejecting heads 1 .

[0057] 1-2a. Holding component 2

[0058] Figure 2 The holding member 2 shown is a carriage that holds multiple liquid ejecting heads 1. The main body 21 is a long, strip-shaped member extending in the X1 direction. The main body 21 is made of a metal such as aluminum or stainless steel, or a resin. When the head unit 10 is configured as a line head that is long in the X1 direction, as in this embodiment, it is preferable to use a highly rigid metal material for the main body 21 to prevent deformation even when holding multiple liquid ejecting heads 1.

[0059] The holding member 2 has a main body portion 21 and a plurality of engaged members 25. The main body portion 21 has a plurality of opening portions H2. The opening portion H2 is a wall portion that forms a hole that penetrates the holding member 2. The plurality of opening portions H2 are provided in correspondence with the plurality of liquid ejecting heads 1. The liquid ejecting head 1 is held by the holding member 2 in a state of being inserted into each opening portion H2. In addition, in Figure 2 , a drawing of a part of the plurality of liquid ejecting heads 1 is omitted for the sake of facilitating understanding of the opening portion H2.

[0060] In Figure 3 the example shown, the plurality of opening portions H2 are divided into a first column L2a and a second column L2b, and each column is arranged in the X1 direction. In addition, the holding member 2 has a shape that is point-symmetrical with respect to a point that is the center of the holding member 2 when viewed in plan. Furthermore, although not shown, in a case where the surface of a conveyance roller that conveys the medium PP is curved, the face of the holding member 2 that opposes the surface in a manner following the surface is slightly inclined with respect to a horizontal plane that has an imaginary line in the direction of gravity as a normal. Furthermore, likewise, the ejection face S11 of each liquid ejecting head 1 described later is slightly inclined with respect to a horizontal plane that has an imaginary line in the direction of gravity as a normal.

[0061] As shown in Figure 5 and Figure 5 , a plurality of positioning pins 211 are provided on the main body portion 21. Two positioning pins 211 are provided for each liquid ejecting head 1. As shown in Figure 2 , the positioning pins 211 protrude in the Z2 direction from the main body portion 21. The positioning pins 211 are used for positioning of the liquid ejecting head 1 with respect to the holding member 2. As shown in Figure 5 , the positioning pins 211 are provided in correspondence with positioning holes 1521 that the liquid ejecting head 1 has, which are described later. In addition, it is also possible to provide the positioning holes on the main body portion 21 of the holding member 2 and to provide the positioning pins on the liquid ejecting head 1.

[0062] As shown in Figure 2 , the main body portion 21 has a recess portion 210. The engaged members 25 are disposed in the recess portion 210. The engaged members 25 are used for fixing the liquid ejecting head 1 with respect to the holding member 2. In addition, the engaged members 25 are described in detail later.

[0063] 1-2b. Plurality of elastic members 4

[0064] As shown in Figure 4As shown, two elastic members 4 are provided for each of the plurality of liquid ejecting heads 1. The elastic member 4 is, for example, a leaf spring having elasticity. The elastic member 4 is used to fix the liquid ejecting head 1 to the holding member 2. Although the material of the elastic member 4 is not particularly limited, it can be, for example, a metal such as stainless steel or nickel alloy. Figure 5 as well as Figures 2 to 5 As shown, the holding member 2 is not arranged to the side of the elastic member 4, that is, closer to the elastic member 4 in the Y1 direction. The holding member 2 is located in the Z2 direction relative to the elastic member 4. The elastic member 4 will be described in detail later.

[0065] 1-2c. Multiple fixing components 3

[0066] Figures 3 to 5 The plurality of fixing members 3 shown are used to fix the liquid ejecting head 1 to the holding member 2. By using the fixing members 3, the liquid ejecting head 1 can be simply fixed to the holding member 2 without having to use multiple screws as in the conventional method. The fixing members 3 will be described in detail later.

[0067] 1-2d. Liquid ejection head 1

[0068] like Figure 4 As shown, the liquid ejecting head 1 has an ejection surface S11 provided with a plurality of nozzles for ejecting ink. Figure 6 As shown, the liquid ejecting head 1 is held by the holding member 2 so that the ejecting surface S11 is located closest to the head unit 10 in the Z1 direction.

[0069] Figure 4 for Figure 6 The exploded perspective view of the liquid ejecting head 1 is shown in FIG. Figure 6 As shown, the liquid jet head 1 includes an electrical connection portion 11, a flow channel structure 12, a wiring substrate 13, a plurality of head chips 50, a fixing plate 14, and a holder 15. These components are stacked and fastened together by a plurality of screws 19.

[0070] like Figure 1 As shown, the electrical connection unit 11 includes a relay substrate 111, two connectors 112, and two covers 113. The relay substrate 111 is electrically connected to the plurality of head chips 50 via the wiring substrate 13. The relay substrate 111 is provided with a plurality of connection terminals and various wirings. The relay substrate 111 is, for example, a rigid substrate. The relay substrate 111 is arranged on the wiring substrate 13 with its surface oriented along the Z1 direction.

[0071] Further, a connector 112 is connected to the relay substrate 111. The connector 112 is used in order to implement electrical connection of the liquid ejection head 1 with the outside. Further, the relay substrate 111 is sandwiched by two cases 113, and is protected by the two cases 113. One of the two cases 113 covers a face of the relay substrate 111 in the Y1 direction, and the other covers a face of the relay substrate 111 in the Y2 direction.

[0072] The flow channel structure 12 is disposed at the Z1 direction side with respect to the electrical connection portion 11. The flow channel structure 12 has a plurality of flow channel substrates 121, 122, 125, 126, and 127. The plurality of flow channel substrates 121, 122, 125, 126, and 127 are arranged in this order in the Z2 direction.

[0073] On the flow channel substrate 127, a plurality of flow channel tubes 129 that protrude in the Z2 direction are provided. The flow channel tubes 129 are used in order to connect to a not-shown tube or the like that is connected to the circulation mechanism 92 shown in FIG. 1. On the flow channel substrates 121, 122, 125, and 126, a plurality of through holes and recesses are formed. A communication flow channel S12 through which ink flows is formed by the plurality of through holes and recesses. The communication flow channel S12 includes a flow channel that supplies ink supplied from the circulation mechanism 92 shown in FIG. 1 to the head chip 50 shown in FIG. 1, and a flow channel that returns ink discharged from the head chip 50 to the circulation mechanism 92. Figure 1 The flow channel tubes 129 are used in order to connect to a not-shown tube or the like that is connected to the circulation mechanism 92 shown in FIG. 1. On the flow channel substrates 121, 122, 125, and 126, a plurality of through holes and recesses are formed. A communication flow channel S12 through which ink flows is formed by the plurality of through holes and recesses. The communication flow channel S12 includes a flow channel that supplies ink supplied from the circulation mechanism 92 shown in FIG. 1 to the head chip 50 shown in FIG. 1, and a flow channel that returns ink discharged from the head chip 50 to the circulation mechanism 92. Figure 6 The flow channel tubes 129 are used in order to connect to a not-shown tube or the like that is connected to the circulation mechanism 92 shown in FIG. 1. On the flow channel substrates 121, 122, 125, and 126, a plurality of through holes and recesses are formed. A communication flow channel S12 through which ink flows is formed by the plurality of through holes and recesses. The communication flow channel S12 includes a flow channel that supplies ink supplied from the circulation mechanism 92 shown in FIG. 1 to the head chip 50 shown in FIG. 1, and a flow channel that returns ink discharged from the head chip 50 to the circulation mechanism 92. Figure 1 The flow channel tubes 129 are used in order to connect to a not-shown tube or the like that is connected to the circulation mechanism 92 shown in FIG. 1. On the flow channel substrates 121, 122, 125, and 126, a plurality of through holes and recesses are formed. A communication flow channel S12 through which ink flows is formed by the plurality of through holes and recesses. The communication flow channel S12 includes a flow channel that supplies ink supplied from the circulation mechanism 92 shown in FIG. 1 to the head chip 50 shown in FIG. 1, and a flow channel that returns ink discharged from the head chip 50 to the circulation mechanism 92.

[0074] In addition, the number of flow channel substrates that the flow channel structure 12 has is not limited to five, and can be one to four, or six or more. Further, each of the materials of the flow channel substrates 121, 122, 125, 126, and 127 is, for example, a metal such as stainless steel (SUS) and aluminum, ceramic, or a resin such as polyphenylene benzobisoxazole and polypropylene.

[0075] A wiring substrate 13 is disposed between the flow channel structures 12. In the example shown in the drawing, the wiring substrate 13 is disposed between the flow channel substrate 122 and the flow channel substrate 125. The wiring substrate 13 is a mounting member for electrically connecting the relay substrate 111 and the plurality of head chips 50. The wiring substrate 13 is, for example, a rigid substrate. Further, on the wiring substrate 13, a connector 131 that is a connection member that connects to the relay substrate 111 is provided.

[0076] The plurality of head chips 50 are disposed at the Z1 direction side with respect to the flow channel structure 12. Each of the head chips 50 includes a nozzle. Further, each of the head chips 50 includes a mechanism for ejecting ink from the nozzle. Specifically, each of the head chips 50 has an actuator unit 51 and a wiring member 52.

[0077] The actuator unit 51 includes, for example, a nozzle plate having nozzles, a flow channel component having a flow channel connected to the nozzles, a pressure chamber base plate having a pressure chamber connected to the flow channel, a vibration plate for varying the pressure within the pressure chamber, and a piezoelectric element for vibrating the vibration plate. The piezoelectric element includes a piezoelectric body and an electrode. The electrode is electrically connected to the wiring component 52. Furthermore, the actuator unit 51 constitutes a portion of the ejection surface S11 on which the nozzles are provided.

[0078] The wiring member 52 has a driving circuit for driving the piezoelectric element of the actuator unit 51. The wiring member 52 is, for example, a COF (Chip on Film). The wiring member 52 electrically connects the piezoelectric element of the actuator unit 51 to the wiring substrate 13. The piezoelectric element of the actuator unit 51 is driven by the power from the wiring substrate 13. Figure 6 The controller 93 is driven by a driving signal.

[0079] like Figure 5 As shown, the fixing plate 14 is a plate-shaped component for fixing the multiple head chips 50 to the holder 15. The fixing plate 14 is formed with openings that expose the multiple nozzles of the head chips 50. The surface of the fixing plate 14 in the Z1 direction constitutes the bottom surface of the liquid ejecting head 1. This bottom surface constitutes a part of the ejection surface S11. The ejection surface S11 is formed by the bottom surface of the fixing plate 14 and the bottom surface of the actuator unit 51. The material of the fixing plate 14 is, for example, a metal such as stainless steel.

[0080] A retainer 15 is disposed in the Z1 direction relative to the flow channel structure 12. The retainer 15 has a predetermined thickness in the Z1 direction. The retainer 15 holds the fixed plate 14 and the plurality of head chips 50. The retainer 15 is made of, for example, stainless steel. Alternatively, the retainer 15 may be made of a metal other than stainless steel, a resin, or the like.

[0081] The holder 15 includes a base 151, a first flange 152a, and a second flange 152b. The base 151 is a plate-shaped portion extending along the XY plane. A recess for accommodating the head chip 50 is formed in the base 151. Furthermore, a through-hole is provided in the base 151, extending continuously from the recess and penetrating in the Z1 direction. The wiring component 52 is inserted through the through-hole.

[0082] The first flange portion 152a extends from the base portion 151 in the Y1 direction. The second flange portion 152b extends from the base portion 151 in the Y2 direction. The first and second flange portions 152a, 152b are elongated strips with their longitudinal sides oriented in the X1 direction. The first and second flange portions 152a, 152b are used to secure the liquid ejecting head 1 to the aforementioned holding member 2.

[0083] Further, as shown in Figure 6 The first flange portion 152a has an opening portion 101 having a second opening portion 102, the details of which will be described later, and a pair of fixing holes 1522. The opening portion 101 is disposed between the pair of fixing holes 1522 in the X1 direction.

[0084] Further, as shown in Figure 3 The second flange portion 152b has an opening portion 101 having a second opening portion 102, a pair of positioning holes 1521, and a pair of fixing holes 1522. The opening portion 101 is disposed between the pair of fixing holes 1522 in the X1 direction. Further, the pair of fixing holes 1522 is disposed between the pair of positioning pins 211 in the X1 direction. The positioning holes 1521 are provided in correspondence with the positioning pins 211 shown in Figure 7 The positioning pins 211 are inserted into the positioning holes 1521. By inserting the positioning pins 211 into the positioning holes 1521, positioning of the liquid ejecting head 1 with respect to the holding member 2 can be performed before the liquid ejecting head 1 is fixed to the holding member 2.

[0085] In addition, in the present embodiment, since a joining method using a screw having a spiral groove is not employed in the fixation of the liquid ejecting head 1 and the holding member 2, the fixing holes 1522 are not used. However, by forming the fixing holes 1522 that can be inserted by the screw in advance in the liquid ejecting head 1 as described above, a fixation method using screw joining with respect to a holding member having a threaded groove different from the present embodiment can be employed.

[0086] 1-3. Structure related to fixation of the liquid ejecting head 1 to the holding member 2

[0087] Figure 5 An enlarged view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figure 8 An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figure 5 An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figure 9 An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figure 5 An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figure 7 An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figures 7 to 9 In the following drawings, the illustration of the fixing holes 1522 is appropriately omitted.

[0088] An exploded perspective view of the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 shown in Figures 7 to 9As shown, the elastic member 4, the liquid ejecting head 1, and the holding member 2 are arranged in this order in the Zl direction. The liquid ejecting head 1 is fixed with respect to the holding member 2 by the fixing member 3. Specifically, the first flange portion 152a and the second flange portion 152b of the holder 15 possessed by the liquid ejecting head 1 are fixed with respect to the engaged member 25 possessed by the holding member 2. Hereinafter, the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 related to the fixing of the liquid ejecting head 1 to the holding member 2 are described while referring to Figures 10 to 20 , and using Figure 10 described later. Also, since the first flange portion 152a and the second flange portion 152b are of the same structure, hereinafter, the contents related to the first flange portion 152a are described representatively, and the description of the contents related to the second flange portion 152b is omitted as appropriate.

[0089] Figure 7 is a cross-sectional view of the fixing member 3 shown in Figure 10 . Figure 10 The fixing member 3 shown in is used in order to fix the liquid ejecting head 1 with respect to the engaged member 25 of the holding member 2. The material of the fixing member 3 is, for example, a metal such as aluminum or stainless steel.

[0090] Figure 7 As shown, the fixing member 3 has a head portion 31, an engaged portion 32, and a shaft portion 33. The shaft portion 33 connects the head portion 31 and the engaged portion 32.

[0091] In the example shown in Figure 8 and Figure 7 , the shape of the head portion 31 is substantially cylindrical, but can be, for example, prismatic. Also, the shaft portion 33 is an elongated portion. Also, the engaged portion 32 is an elongated portion, and the length of the engaged portion 32 in the longitudinal direction is shorter than the length of the shaft portion 33 in the longitudinal direction. Also, the longitudinal direction of the shaft portion 33 and the longitudinal direction of the engaged portion 32 intersect. In the example shown in the drawing, the longitudinal direction of the shaft portion 33 and the longitudinal direction of the engaged portion 32 are orthogonal.

[0092] The head portion 31 is a portion that comes into contact with the elastic member 4. In the present embodiment, the head portion 31 functions as an operation portion for rotating the fixing member 3 with respect to the liquid ejecting head 1 in the X-Y plane when fixing the liquid ejecting head 1. Also, the engaged portion 32 is a portion that engages with the holding member 2. In the present embodiment, the engaged portion 32 is configured so as to be capable of being fitted with the first flange portion 152a and the engaged member 25, respectively. As shown in Figure 11As shown, with the first flange portion 152a fixed to the engaged member 25, the engaging portion 32 is fitted into the engaged member 25. More specifically, with the elastic member 4 and the first flange portion 152a positioned between the head portion 31 and the engaging portion 32, the fixing member 3 is fitted into the engaged member 25. Furthermore, the shaft portion 33 has a length corresponding to the length of the elastic member 4 and the first flange portion 152a in the Z1 direction.

[0093] Figure 7 for Figure 11 A plan view of the elastic component 4 is shown. Figures 7 to 9 The elastic member 4 shown is a spring member having elasticity. The elastic member 4 improves the stability of the liquid ejecting head 1 when it is fixed to the holding member 2 or when the liquid ejecting apparatus 100 is used, compared to a case where the spring member 4 is not provided.

[0094] like Figure 11 ,as well as Figure 11 As shown, the elastic member 4 is a long, flat leaf spring with a portion bent. The elastic member 4 abuts against the head portion 31 of the fixing member 3 while the liquid ejecting head 1 is fixed to the holding member 2 via the fixing member 3 .

[0095] The elastic member 4 has elasticity. The elastic member 4 includes a base portion 41 and two spring portions 42. The base portion 41 is located between the two spring portions 42. The spring portion 42 is elastically deformable along the Z axis.

[0096] Furthermore, the base 41 has a first opening 401 through which the shaft 33 is inserted. The first opening 401 is a wall portion that forms a hole that passes through the base 41 of the elastic member 4. Figure 7 As shown in FIG. 1 , the shape of the hole defined by the first opening 401 when viewed from above is along the long side of the elastic member 4. The hole defined by the first opening 401 corresponds to the shaft 33 and the engaging portion 32 of the fixing member 3 and is formed so that the shaft 33 and the engaging portion 32 can be inserted therethrough. Figure 8 as well as Figure 12 As shown, the shape of the elastic member 4 in plan view corresponds to the shape of the first flange portion 152a in plan view. The length of the elastic member 4 in the longitudinal direction is less than or equal to the length of the first flange portion 152a in the longitudinal direction.

[0097] Figure 7 for Figure 12 FIG. 1 is a plan view of a first flange portion 152 a of the retainer 15 shown. Figure 7 The first flange portion 152 a shown is used to fix the holder 15 of the liquid jet head 1 to the engaged member 25 .

[0098] like Figure 12 as well as Figure 12 As shown, the first flange portion 152a of the liquid jet head 1 has an opening 101 through which the shaft portion 33 is inserted. The opening 101 has a second opening 102 and a second engaged portion 103.

[0099] The second opening 102 is a wall portion that forms a hole that passes through the first flange portion 152a. Figure 7 As shown, the shape of the hole defined by the second opening 102 when viewed in plan is along the longitudinal direction of the first flange 152a. The hole defined by the second opening 1022 corresponds to the shaft 33 and the engaging portion 32 of the fixing member 3 and is formed so that the shaft 33 and the engaging portion 32 can be inserted therethrough.

[0100] like Figure 12 As shown, the second engaged portion 103 is located in the Z2 direction relative to the second opening portion 102. The second engaged portion 103 is a wall portion of a groove formed on the surface of the first flange portion 152a in the Z2 direction. The groove defined by the second engaged portion 103 and the hole defined by the second opening portion 102 are connected. In addition, as shown in FIG. Figure 13 As shown, the groove defined by the second engaged portion 103 extends in the Y1 direction when viewed in plan, and intersects the hole defined by the second opening 102. In the example shown in the figure, the groove defined by the second engaged portion 103 is orthogonal to the hole defined by the second opening 102 when viewed in plan.

[0101] Figure 7 for Figure 14 A perspective view of the engaged component 25 is shown. Figure 7 for Figure 15 A cross-sectional view of the engaged component 25 is shown. Figure 7 for Figures 13 to 15 A plan view of the engaged component 25 is shown. Figure 7 The engaged member 25 shown is a member engaged with the engaging portion 32 of the fixing member 3. The material of the engaged member 25 is, for example, aluminum. Alternatively, the material of the engaged member 25 may be a metal other than aluminum, or a resin.

[0102] like Figure 9 as well as Figure 14 As shown, the engaged component 25 is arranged in the recess 210 of the main body 21. The Z1 direction surface of the main body 21 and the Z1 direction surface of the engaged component 25 are located at the same position. Therefore, a substantially flat surface is formed by the Z1 direction surface of the main body 21 and the Z1 direction surface of the engaged component 25. Figure 15 as well as Figure 14As shown, the engaged member 25 has two screw openings 290 and an opening 201. The opening 201 is located between the two screw openings 290 in a plan view.

[0103] The two screw openings 290 are wall portions that form holes that pass through the engaged component 25. A screw component 29 is inserted into each screw opening 290. The top end of the screw component 29 is inserted into the screw hole formed on the main body 21. Therefore, the engaged component 25, which is a separate body from the main body 21, is fixed to the main body 21 by the screw component 29. Therefore, the engaged component 25 is detachable relative to the main body 21. Since it is detachable, it is easy to replace the engaged component 25 in the event that the engaged component 25 is scraped or ink is attached to the engaged component 25 due to repeated replacement of the liquid ejecting head 1.

[0104] The opening 201 is a wall portion forming a hole that penetrates the engaged member 25 in the Z1 direction. The opening 201 includes a third opening 202 , a first engaged portion 203 , a fourth opening 204 , a fifth opening 205 , and a restricting portion 206 .

[0105] like Figure 15 As shown, the third opening 202, the first engaged portion 203, the fourth opening 204, and the fifth opening 205 form a portion of a hole that passes through the engaged component 25 in the Z1 direction. The third opening 202, the first engaged portion 203, the fourth opening 204, and the fifth opening 205 are arranged in this order in the Z1 direction. The holes formed by the third opening 202, the first engaged portion 203, the fourth opening 204, and the fifth opening 205 are connected.

[0106] like Figure 13 As shown, the shape of the hole defined by the third opening 202, when viewed in plan, is along the width direction of the engaged component 25, i.e., the Y1 direction. The hole defined by the third opening 202 corresponds to the shaft portion 33 and the engaging portion 32 of the fixing member 3 and is formed so that the shaft portion 33 and the engaging portion 32 can be inserted therethrough. Furthermore, the hole of the third opening 202 opens in the Z2 direction of the engaged component 25.

[0107] like Figure 15 As shown, the first engaged portion 203 is also a groove formed on the engaged member 25. More specifically, the first engaged portion 203 is a groove formed on the surface of the third opening 202 opposite to the surface facing the second opening 102. The first engaged portion 203 is engaged in the engaging portion 32. Figure 13As shown, the shape of the groove defined by the first engaged portion 203, when viewed in plan, is a shape that is along the longitudinal direction of the engaged component 25. The groove defined by the first engaged portion 203, when viewed in plan, intersects the hole defined by the third opening 202. In the example shown, the groove defined by the first engaged portion 203, when viewed in plan, is orthogonal to the hole defined by the third opening 202. Furthermore, the groove defined by the first engaged portion 203 corresponds to the engaging portion 32 of the fixing component 3 and is formed so that the engaging portion 32 can be inserted therethrough.

[0108] like Figure 15 as well as Figure 13 As shown, the hole defined by the fourth opening 204 opens in the Y1 and Y2 directions of the engaged part 25. The length of the hole defined by the fourth opening 204 in the X1 direction is longer than the length of the first engaged part 203 in the X1 direction. Furthermore, the hole defined by the fifth opening 205 opens in the Z1 direction of the engaged part 25 and opens in the Y1 and Y2 directions of the engaged part 25. The length of the hole defined by the fifth opening 205 in the X1 direction is shorter than the length of the fourth opening 204 in the X1 direction. The fourth opening 204 and the first engaged part 203 can be collectively understood as the "first engaged part," or the fifth opening 205, the fourth opening 204, and the first engaged part 203 can be collectively understood as the "first engaged part."

[0109] like Figure 15 as well as Figure 16 As shown, the two restricting portions 206 are wall portions provided on the fourth opening 204. One of the two restricting portions 206 is located in the Y1 direction relative to the first engaged portion 203 when viewed in plan, while the other is located in the Y2 direction relative to the first engaged portion 203 when viewed in plan. Furthermore, the two restricting portions 206 are arranged point-symmetrically with respect to the center of the groove defined by the first engaged portion 203 when viewed in plan. These restricting portions 206 restrict rotation of the engaging portion 32 of the fixing member 3 in the XY plane.

[0110] As explained above, the liquid ejecting apparatus 100 has the liquid ejecting head 1, the holding member 2, the elastic member 4, and the fixing member 3. Also, the liquid ejecting head 1 and the holding member 2 are fixed by engaging the engaging portion 32 of the fixing member 3 with the first engaged portion 203 of the elastic member 4 in a manner of sandwiching the first opening portion 401 of the elastic member 4 and the second opening portion 102 of the liquid ejecting head 1 between the head portion 31 and the engaging portion 32 of the fixing member 3. Therefore, the liquid ejecting head 1 can be simply fixed to the holding member 2 without using a plurality of screws as in the conventional method. Therefore, the installation and replacement of the liquid ejecting head 1 can be simply performed.

[0111] Here, in the case of using a plurality of screws as in the conventional method, it is necessary to simultaneously perform three operations of pressing the liquid ejecting head 1 against the holding member 2, holding the screws, and fixing the screws using a screwdriver or the like. In contrast, the liquid ejecting head 1 can be simply fixed to the holding member 2 by the operation of pressing the liquid ejecting head 1 using the fixing member 3 and rotating the fixing member 3 in the X-Y plane. Therefore, the number of operations is reduced compared to the conventional method, and thus the installation and replacement of the liquid ejecting head 1 can be simply performed.

[0112] Also, the liquid ejecting apparatus 100 has the elastic member 4. Therefore, the liquid ejecting head 1 can be stably fixed to the holding member 2 using the elastic force of the elastic member 4 compared to the case where the elastic member 4 is not provided. Therefore, although it is difficult to stabilize the liquid ejecting head 1 over time due to loosening of the screws in the conventional screw combination, the stabilized fixed state of the liquid ejecting head 1 can be maintained for a long time by the fixing using the fixing member 3. Furthermore, since the number of places to be fixed can be reduced by using the fixing member 3 and the elastic member 4, the time taken for the operation of fixing can be greatly reduced. Furthermore, since the liquid ejecting head 1 can be simply fixed to the holding member 2 using the fixing member 3, the liquid ejecting head 1 can be fixed to the holding member 2 without falling of the liquid ejecting head 1 or the fixing member 3 or the like even in a state where the liquid ejecting head 1 is located below the gravity direction with respect to the holding member 2, that is, in a state where the liquid ejecting head 1 cannot be placed on the holding member 2.

[0113] 1-4. Method of fixing the liquid ejecting head 1 to the holding member 2

[0114] The manufacturing method of the liquid ejecting apparatus 100 has a process of preparing the liquid ejecting head 1, the holding member 2, the elastic member 4, and the fixing member 3, and a process of fixing the liquid ejecting head 1 on the holding member 2. Hereinafter, the method of fixing the liquid ejecting head 1 on the holding member 2 is described. The method of fixing the liquid ejecting head 1 on the holding member 2 includes a process of fixing the elastic member 4 on the liquid ejecting head 1, and a process of fixing the liquid ejecting head 1 on the holding member 2.

[0115] Figure 17 and Figure 16 are diagrams for describing the fixing of the elastic member 4 to the liquid ejecting head 1, respectively. As shown in Figure 16 , first, the hole defined by the first opening portion 401 of the elastic member 4 and the hole defined by the second opening portion 102 of the liquid ejecting head 1 are in a state of overlapping when viewed in plan. Thereafter, the engaging portion 32 and the shaft portion 33 of the fixing member 3 are inserted into the first opening portion 401 and the second opening portion 102.

[0116] In the state where the shaft portion 33 is inserted into the first opening portion 401 and the second opening portion 102, the hole defined by the first opening portion 401, the hole defined by the second opening portion 102, and the engaging portion 32 overlap when viewed in plan. In other words, the second position, which is the rotational position into which the engaging portion 32 can be inserted into the second opening portion 102, is the same as the rotational position into which the engaging portion 32 can be inserted into the first opening portion 401. Therefore, as shown in Figure 17 , the fixing member 3 does not need to be rotated in the insertion of the fixing member 3 into the first opening portion 401 and the second opening portion 102. That is, the engaging portion 32 of the fixing member 3 can be simply inserted into the first opening portion 401 and the second opening portion 102 without having to rotate the fixing member 3.

[0117] Next, as shown in Figure 18 , the engaging portion 32 is engaged with the second engaged portion 103 by rotating the fixing member 3 in the X-Y plane. In the present embodiment, the head portion 31 is operated to rotate the engaging portion 32 by 90° in the X-Y plane. In the state where the engaging portion 32 is engaged with the second engaged portion 103, the first opening portion 401 and the second opening portion 102 are positioned between the head portion 31 and the engaging portion 32.

[0118] As described above, the first flange portion 152a and the second flange portion 152b of the liquid ejecting head 1 have the second engaged portion 103 which can be engaged with the engaging portion 32. Therefore, by engaging the engaging portion 32 with the second engaged portion 103, it is possible to fix the elastic member 4 to the liquid ejecting head 1. Therefore, it is possible to fix the elastic member 4 to the liquid ejecting head 1 in advance before fixing the liquid ejecting head 1 to the holding member 2. That is, it is possible to engage the second engaged portion 103 of the liquid ejecting head 1 with the engaging portion 32 before engaging the first engaged portion 203 of the holding member 2 described later with the engaging portion 32. Therefore, it is possible to fix the elastic member 4 to the liquid ejecting head 1 without falling of the liquid ejecting head 1 and the elastic member 4. Further, by crossing the hole of the second opening portion 102 and the groove of the second engaged portion 103 in plan view as in the present embodiment, it is possible to fit the engaging portion 32 into the second engaged portion 103.

[0119] Figure 19 、 Figure 20 and Figure 18 are diagrams for explaining the fixing of the liquid ejecting head 1 to the holding member 2. As shown in Figure 18 , by performing positioning by the positioning pin 211 in a state where the elastic member 4 is fixed to the liquid ejecting head 1 by the fixing member 3, the elastic member 4, the liquid ejecting head 1, and the holding member 2 are overlaid in a manner that the first opening portion 401 and the third opening portion 202 are orthogonal in plan view. In this overlaid state, as shown in Figure 19 , the engaging portion 32 of the fixing member 3 is inserted into the third opening portion 202 of the holding member 2.

[0120] Next, as shown in Figure 19 , by pushing the fixing member 3 directly to the Z2 direction, the shaft portion 33 is inserted into the third opening portion 202, and the engaging portion 32 is inserted into the fourth opening portion 204.

[0121] In a case where the elastic member 4, the liquid ejecting head 1, and the holding member 2 are overlaid in a manner that the first opening portion 401 and the third opening portion 202 are orthogonal in plan view, the engaging portion 32, the second engaged portion 103, and the third opening portion 202 are overlaid in plan view. In other words, the rotational position at which the engaging portion 32 is engaged with the second engaged portion 103 is the same as the first position which is the rotational position at which the engaging portion 32 can be inserted into the third opening portion 202. Therefore, as shown in Figure 20 , since the engaging portion 32 can be inserted into the third opening portion 202 by pushing the fixing member 3 directly to the Z2 direction in a state where the elastic member 4 is fixed to the liquid ejecting head 1 by the fixing member 3, the workability is good.

[0122] Next, if Figure 20 As shown, the head 31 presses the elastic member 4, and the first opening 401 and the second opening 102 are sandwiched between the head 31 and the engaging portion 32, thereby engaging the engaging portion 32 with the first engaged portion 203. Specifically, the head 31 presses the elastic member 4, and the fixing member 3 is rotated in the XY plane using the shaft 33 as the rotation axis. Specifically, the fixing member 3 is rotated 90°. This secures the liquid ejecting head 1 and the retaining member 2.

[0123] In this manner, by engaging the engaging portion 32 and the first engaged portion 203 with the first opening 401 and the second opening 102 sandwiched between the head 31 and the engaging portion 32, the liquid ejecting head 1 can be simply secured to the retaining member 2 without requiring the use of multiple screws as in conventional methods. Consequently, installation and replacement of the liquid ejecting head 1 can be simplified. Furthermore, since rotation of less than 180°, and further, less than 90°, is sufficient, this significantly saves the operator's time and effort.

[0124] Specifically, by rotating the fixing member 3 within the XY plane using the shaft 33 as the rotation axis while the shaft 33 is inserted through the second opening 102 and the third opening 202, the engaging portion 32 engages with the first engaged portion 203. As a result, the liquid ejecting head 1 is secured to the retaining member 2. This simple operation of rotating the fixing member 3 within the XY plane allows the liquid ejecting head 1 to be easily secured to the retaining member 2, significantly saving the operator's time and effort.

[0125] Furthermore, in this embodiment, the engaging portion 32 is fitted into the first engaged portion 203. Therefore, after the liquid ejecting head 1 is secured to the holding member 2, the engaging portion 32 and the first engaged portion 203 are prevented from being disengaged due to vibrations during printing, etc. Consequently, the liquid ejecting head 1 is stably and satisfactorily secured to the holding member 2 for a long period of time.

[0126] In addition, if Figure 21As shown, the second opening portion 102 is disposed below the gravitational direction with respect to the holding member 2. Also, the insertion direction of the fixing member 3 is a direction from below the gravitational direction toward above. According to the fixing method of the liquid ejecting head 1 using the fixing member 3, it is not necessary to simultaneously perform the three operations of pressing the liquid ejecting head 1, holding the screw, and fixing the screw using the tool as in the conventional method. Therefore, even in the case where the liquid ejecting head 1 is fixed to the holding member 2 from below the gravitational direction toward above, in other words, even in the case where the workability is poor in that the liquid ejecting head 1 cannot be fixed to the holding member 2 in the state where the liquid ejecting head 1 is placed on the holding member 2, the liquid ejecting head 1 can be simply fixed to the holding member 2.

[0127] Further, as described above, the hole of the third opening portion 202 of the holding member 2 and the hole of the second opening portion 102 of the liquid ejecting head 1 cross when viewed in plan. In other words, the rotational position, i.e., the first position, in which the engaging portion 32 can be inserted into the third opening portion 202 is different from the rotational position, i.e., the second position, in which the engaging portion 32 can be inserted into the second opening portion 102. Therefore, since the fixing member 3 does not fall even when the worker does not hold the fixing member 3 when the fixing member 3 is inserted into the third opening portion 202 by rotating the fixing member 3 to the first position different from the second position in advance, the work can be stably performed. Further, when the engagement of the engaging portion 32 and the first engaged portion 203 is released by rotating the fixing member 3 on the X-Y plane in order to remove the liquid ejecting head 1 from the holding member 2, since the engaging portion 32 is positioned at the first position, the fixing member 3 does not fall through the second opening portion 102 at the time of the release. The effect is particularly significant in the case where the liquid ejecting head 1 is fixed to the holding member 2 from below the gravitational direction toward above as in the present embodiment, since the fixing member 3 is likely to fall.

[0128] Further, the holding member 2 has a restriction portion 206 that restricts the rotation of the fixing member 3. Therefore, when the fixing member 3 is rotated in the X-Y plane, it is only necessary to release the pushing of the fixing member 3 in the Zl direction at the position where the engaging portion 32 hits the restriction portion 206, and the engaging portion 32 can be simply engaged with the first engaged portion 203.

[0129] Further, the head portion 31 has a groove 311 which is engaged with a tool for rotating the fixing member 3. Therefore, by using a screwdriver having a shape corresponding to the groove 311 and a tool such as a wrench to operate the fixing member 3, the liquid ejecting head 1 can be simply fixed to the holding member 2. Further, by opening the groove 311 in the Zl direction of the head portion 31, even if there is not enough space in the X-Y plane, the installation and replacement of the liquid ejecting head 1 can be simply performed by using a tool extending in the Zl direction.

[0130] Further, the elastic member 4 is separate from the liquid ejecting head 1 and the holding member 2. The elastic member 4 is not fixedly attached to the liquid ejecting head 1 and the holding member 2, and is not fixed by a member other than the fixing member 3. Therefore, in the case where the elastic member 4 is deteriorated due to the replacement of the liquid ejecting head 1 and the like, the replacement of the elastic member 4 is easy. Further, by not fixing the elastic member 4 to the liquid ejecting head 1 and the holding member 2, the elastic member 4 is easily elastically deformed, and the fixing member 3 is easily pushed into the fourth opening portion 204. Further, by not fixing the elastic member 4 to the liquid ejecting head 1 but being separate, the elastic member 4 can be used even if the face on which the elastic member 4 is provided is reversed with respect to the first flange portion 152a and the second flange portion 152b. Therefore, the arrangement of the elastic member 4 with respect to the first flange portion 152a and the second flange portion 152b can be easily changed. In the present embodiment, the liquid ejecting head 1 is fixed from below in the vertical direction with respect to the holding member 2, but the arrangement of the elastic member 4 can be easily changed according to the case where the liquid ejecting head 1 is fixed from above in the vertical direction with respect to the holding member 2.

[0131] Further, as described above, the length of the shaft portion 33 is set to a degree that does not plastically deform the elastic member 4. Further, in the state where the engaging portion 32 and the first engaged portion 203 are engaged, the distance from the abutting face of the head portion 31 abutting against the elastic member 4 to the second opening portion 102 is set to be smaller than the amount of deformation in the Zl direction when the elastic member 4 is deformed up to the upper yield point which is the elastic limit of the elastic member 4. Therefore, in the case where a load acts in the Zl direction with respect to the liquid ejecting head 1 when, for example, a wiring member provided outside is connected to the connector 112 of the liquid ejecting head 1 by being inserted in the Zl direction, even if the elastic member 4 is deformed in the Zl direction due to the load, the elastic member 4 can be prevented from being plastically deformed.

[0132] Further, the holder 15 and the holding member 2 are formed of materials having different linear expansion coefficients. More specifically, the main body portion 21 of the holding member 2 which is long in the X-axis direction and the second opening portion 102 of the holder 15 are formed of materials having different linear expansion coefficients. Even if the holder 15 or the holding member 2 is deformed due to the difference in these linear expansion coefficients, since the elastic member 4 is provided, it is possible to stably maintain the fixed state of the liquid ejecting head 1 on the holding member 2 compared to a case where the elastic member 4 is not provided. Therefore, it is possible to select appropriate materials for each of the materials of the holder 15 and the holding member 2. Therefore, it is possible to improve the design freedom.

[0133] Further, the holding member 2 is located in the Z2 direction with respect to the first flange portion 152a of the liquid ejecting head 1. Therefore, compared to a case where the holding member 2 is located laterally to the first flange portion 152a, it is possible to achieve the downsizing of the holding member 2.

[0134] 2. Second Embodiment

[0135] The second embodiment will be described. In addition, regarding elements having the same function as the first embodiment in each of the following examples, the symbols used in the description of the first embodiment are used and the detailed description of each is appropriately omitted.

[0136] Figure 21 A perspective view of a fixing member 3A of the second embodiment is shown. The present embodiment is the same as the first embodiment except that the fixing member 3A is used instead of the fixing member 3. Hereinafter, regarding the fixing member 3A, matters different from the fixing member 3 of the first embodiment will be described and the description of the same matters will be appropriately omitted.

[0137] Figure 21 The fixing member 3A shown has a head portion 31A instead of the head portion 31 of the first embodiment. The head portion 31A is a shaft for rotating the fixing member 3A in the X-Y plane. By making the head portion 31A a shaft, it is possible to fix the liquid ejecting head 1 on the holding member 2 using the fixing member 3A without using a tool. Therefore, it is possible to more simply perform the installation and replacement of the liquid ejecting head 1 compared to a case where a tool is used.

[0138] Specifically, the head portion 31A of the fixing member 3A is configured to be able to rotate around the shaft portion 33 in the direction shown by an arrow mark Al l and in the direction shown by an arrow mark A12. For example, in a state where the head portion 31A is rotated 90 degrees in the Al l direction from the state of the fixing member 3A shown, the shaft portion 33 of the fixing member 3A is inserted through the first opening portion 401 and the second opening portion 102. Next, by making the head portion 31A rotate 90 degrees in the A12 direction from the state of the fixing member 3A shown, the shaft portion 33 of the fixing member 3A is inserted through the first opening portion 401 and the second opening portion 102. In this way, the fixing member 3A is fixed to the holding member 2. Figure 21 The fixing member 3A shown is in a state where the head portion 31A is rotated 90 degrees in the A12 direction from the state of the fixing member 3A shown. In this state, the shaft portion 33 of the fixing member 3A is inserted through the first opening portion 401 and the second opening portion 102. In this way, the fixing member 3A is fixed to the holding member 2. Figure 21The fixing member 3A is rotated 90 degrees in the direction A11 and then rotated in the direction indicated by the arrow mark A12, so that the engaging portion 32 is engaged with the second engaged portion 103. Next, the fixing member 3A is pushed in the direction Z2 and the head 31A is rotated in the direction indicated by the arrow mark A11 to return to the position from which it was originally positioned. Figure 21 The state of the fixing member 3A shown is a state in which the fixing member 3A is rotated 90 degrees in the direction A11, thereby engaging the engaging portion 32 with the first engaged portion 203. By manipulating the head 31A in this manner, the liquid jet head 1 can be easily installed and replaced.

[0139] In addition, when the liquid ejecting head 1 is fixed to the holding member 2, the fixing member 3A becomes Figure 22 The state of the fixing member 3A shown is a state in which the fixing member 3A is rotated 90 degrees in the direction A11. Therefore, the head unit 10 can be miniaturized.

[0140] 3. Third Implementation

[0141] In the following examples, elements having the same functions as those in the first embodiment are designated by the same reference numerals as those used in the first embodiment, and detailed descriptions thereof are omitted as appropriate.

[0142] Figure 23 It is a cross-sectional view showing a fixing member 3B according to the third embodiment. Figure 22 This is a cross-sectional view showing an exploded state of a fixing member 3B of the third embodiment. This embodiment is identical to the first embodiment, except that a fixing member 3B is used instead of the fixing member 3. The following description of the fixing member 3B will focus on the differences from the fixing member 3 of the first embodiment, and descriptions of similarities will be omitted as appropriate.

[0143] like Figure 23 as well as Figure 23 As shown, the fixing member 3B is composed of multiple components. Specifically, the fixing member 3B includes a first component 301 and a second component 302. The first component 301 and the second component 302 are separable and reassembled. The first component 301 includes a head portion 31 and a first shaft portion 33B. The second component 302 includes an engaging portion 32 and a second shaft portion 34. The first shaft portion 33B and the second shaft portion 34 constitute the "shaft portion." In other words, in this embodiment, the "shaft portion" is formed by both the first component 301 and the second component 302.

[0144] like Figure 22As shown, the first shaft portion 33B has a tip end portion 331 that can be engaged with the second shaft portion 34. The tip end portion 331 is located at the end of the first shaft portion 33B opposite the head portion 31. On the outer peripheral surface of the tip end portion 331, for example, an external thread is formed. Further, the second shaft portion 34 is configured to be engageable with the tip end portion 331. On the inner peripheral surface of the second shaft portion 34, for example, an internal thread is formed. By fitting the second member 302 to the first member 301, the first member 301 is fixed to the second member 302 as shown. Figure 24

[0145] In the case where the fixing member 3B is used to fix the liquid ejecting head 1 to the holding member 2, the first member 301 is fixed to the second member 302 in a state where the "shaft portion" composed of the first shaft portion 33B of the first member 301 and the second shaft portion 34 of the second member 302 is inserted through both the first opening portion 401 and the second opening portion 102. That is, the first member 301 and the second member 302 are fixed in a state where the "shaft portion" composed of the first shaft portion 33B and the second shaft portion 34 is inserted through both the first opening portion 401 and the second opening portion 102. Further, the shape of each hole of the first opening portion 401 and the second opening portion 102 is designed, for example, in a manner matching the shape of the first shaft portion 33B and the shape of the second shaft portion 34, and further, the shape of each hole of the first opening portion 401 and the second opening portion 102 is made such that the engaging portion 32 and the head portion 31 cannot be inserted therethrough.

[0146] Therefore, it is not necessary to perform the rotation operation of the fixing member 3B during the period before the fixing member 3B is inserted through both the first opening portion 401 and the second opening portion 102 as in the first embodiment. Further, since the shape is made such that the engaging portion 32 and the head portion 31 cannot be inserted through each hole of the first opening portion 401 and the second opening portion 102, the case where the fixing member 3B and the elastic member 4 are detached from the liquid ejecting head 1 after the first member 301 and the second member 302 are fixed does not occur. Therefore, it is possible to prevent the possibility that the fixing member 3B and the elastic member 4 fall during the fixing of the liquid ejecting head 1. Further, it is possible to design the shape of each hole of the first opening portion 401 and the second opening portion 102 in a manner matching the shape of the first shaft portion 33B and the shape of the second shaft portion 34. Specifically, for example, it is possible to form a circular hole matching the cross-sectional shape of the first shaft portion 33B and the second shaft portion 34. Therefore, it is made easier to process each member, and it is possible to improve the mechanical strength of each member, particularly the elastic member 4.

[0147] In addition, the method of fixing the first member 301 to the second member 302 is not limited to screwing, and for example, can be adhesion or press-fitting, etc.​

[0148] Further, although the "shaft portion" is constituted by both the first member 301 and the second member 302 in the present embodiment, the "shaft portion" can be constituted by only either one of the first member 301 and the second member 302. Specifically, although the "shaft portion" is constituted by the first shaft portion 33B and the second shaft portion 34 in the present embodiment, the "shaft portion" can be constituted by only either one of the first shaft portion 33B and the second shaft portion 34. For example, in the case where the fixing member 3B is constituted by forming an external thread at an end portion of the second shaft portion 34 of the second member 302 on the opposite side to the engaging portion 32 and combining the external thread with an internal thread formed in the inside of the head portion 31, since the first member 301 does not have the first shaft portion 33B as a part of the "shaft portion", the "shaft portion" is constituted by only the second shaft portion 34 of the second member 302. In other words, the "shaft portion" is constituted by only the second member 302 as one of the first member 301 and the second member 302.

[0149] 4. Modified example

[0150] The above-described modes can be variously modified. Hereinafter, specific modified modes that can be applied to the above-described modes will be exemplified. Two or more modes selected arbitrarily from the following exemplifications can be appropriately combined within a range where they do not contradict each other.

[0151] 4-1. First modified example

[0152] Figure 24 A diagram schematically showing a liquid ejecting head 1C and a holding member 2C of the first modified example. In the above-described embodiment, the first flange portion 152a of the liquid ejecting head 1 is located in the Z1 direction with respect to the holding member 2, but in the first modified example, the first flange portion 152a is located in the Z2 direction with respect to a part of the holding member 2. Figure 24 In the example shown, the first flange portion 152a is located in the Z2 direction with respect to a part of the holding member 2.

[0153] In this case, the holding member 2C has a second opening portion 271 and a second engaged portion 272. The second opening portion 271 functions and effects the same as the second opening portion 102 of the first embodiment. The second engaged portion 272 functions and effects the same as the second engaged portion 103 of the first embodiment. Further, the liquid ejecting head 1C has a third opening portion 171 and a first engaged portion 172. The third opening portion 171 functions and effects the same as the third opening portion 202 of the first embodiment. The first engaged portion 172 functions and effects the same as the first engaged portion 203 of the first embodiment.

[0154] Therefore, in the first modification, as with the first embodiment, the engaging portion 32 and the first engaged portion 172 of the liquid ejecting head 1C are engaged by sandwiching the first opening portion 401 of the elastic member 4 and the second opening portion 271 of the holding member 2C between the head portion 31 and the engaging portion 32 of the fixing member 3, thereby fixing the liquid ejecting head 1C and the holding member 2C.

[0155] In addition, although the long side direction of the first engaged portion 172 and the long side direction of the second engaged portion 272 are described as the same X1 direction in the first embodiment for ease of understanding the description, it is preferable that the long side direction of the first engaged portion 172 and the long side direction of the second engaged portion 272 cross each other as in the embodiment described above in order to prevent the fixing member 3 from falling down. Figure 25

[0156] 4-2. Second Modification

[0157] Figure 26 A diagram showing the arrangement of the liquid ejecting head 1 and the holding member 2 of the first embodiment. Figure 25 A diagram showing the arrangement of the liquid ejecting head 1D and the holding member 2D of the second modification. As shown in Figure 26 In the first embodiment, the holding member 2 is located in the Z2 direction with respect to the first flange portion 152a. In this case, the fixing member 3 is installed from below in the direction of gravity toward the upper side with respect to the liquid ejecting head 1 and the holding member 2. However, in the case where a part of the holding member 2 is located in the Z1 direction with respect to the first flange portion 152a of the liquid ejecting head 1D as shown in Figure 25 , the fixing member 3 can be installed from above in the direction of gravity toward the lower side with respect to the liquid ejecting head 1 and the holding member 2.

[0158] Further, by locating the holding member 2 in the Z2 direction with respect to the first flange portion 152a as shown in Figure 26 , the holding member 2 is not located to the side of the second opening portion 102. By locating the holding member 2 in the Z2 direction with respect to the first flange portion 152a, the liquid ejecting head 1 is easily made compact compared to the example shown in Figure 25 . As shown in Figure 27 , since the space inside the holding member 2 can be reduced, the liquid ejecting head 1 is easily made compact. Further, since the distance between the ejection surface S11 and the fixing member 3 is made short by fixing the fixing member 3 from below in the direction of gravity toward the upper side, the position accuracy of the nozzle can be improved.

[0159] 4-3. Third Modification ​

[0160] Figure 27 A diagram for schematically showing the liquid ejecting head 1E and the holding member 2E of the third modification example. In Figure 28 In the example shown, the holding member 2E is located above the gravitational direction with respect to the first flange portion 152a and the base portion 151. In the case of this example, the fixing member 3 can be installed from above the gravitational direction toward the lower side with respect to the liquid ejecting head 1E and the holding member 2E.

[0161] In this case, the holding member 2E has a second opening portion 273. The second opening portion 273 functions in the same manner as the second opening portion 102 of the first embodiment. In addition, in the case where the liquid ejecting head 1E is fixed on the holding member 2E from above the gravitational direction toward the lower side, the "second engaged member" can be omitted. Furthermore, the liquid ejecting head 1E has a third opening portion 173 and a first engaged portion 174. The third opening portion 173 functions in the same manner as the third opening portion 202 of the first embodiment. The first engaged portion 174 functions in the same manner as the first engaged portion 203 of the first embodiment.

[0162] 4-4. Fourth Modification Example

[0163] Figure 28 A diagram for schematically showing the liquid ejecting head 1F and the holding member 2F of the fourth modification example. In Figure 29 In the example shown, the holding member 2F is located above the gravitational direction with respect to the base portion 151 and below the gravitational direction with respect to the first flange portion 152a. In the case of this example, the fixing member 3 is installed from above the gravitational direction toward the lower side with respect to the liquid ejecting head 1F and the holding member 2F.

[0164] In this case, the liquid ejecting head 1F has a second opening portion 175. The second opening portion 175 functions in the same manner as the second opening portion 102 of the first embodiment. In addition, in the case where the liquid ejecting head 1F is fixed on the holding member 2F from above the gravitational direction toward the lower side, the "second engaged member" can be omitted. Furthermore, the holding member 2F has a third opening portion 274 and a first engaged portion 275. The third opening portion 274 functions in the same manner as the third opening portion 202 of the first embodiment. The first engaged portion 275 functions in the same manner as the first engaged portion 203 of the first embodiment.

[0165] 4-5. Fifth Modification Example

[0166] Figure 29Schematically shows a fifth modified example of the retaining member 2G. Figure 29 As shown, the retaining member 2G has a second engaged portion 177 in addition to the second opening 102 and the second engaged portion 103. In other words, the retaining member 2G has two "second engaged portions". The second engaged portion 103 is located in the Z2 direction of the second opening 102, while the second engaged portion 177 is located in the Z1 direction of the second opening 102. Therefore, Figure 29 In the example shown, the "second engaged portion" is provided on both sides of the second opening 102. Figure 30 In addition to the case where the fixing member 3 is inserted upward from the bottom in the direction of gravity into the second opening 102 of the holding member 2G as shown, the fixing member 3 can also be inserted downward from the top in the direction of gravity into the second opening 102 of the holding member 2G. Therefore, for example, the insertion direction of the fixing member 3 can be easily changed by adjusting the arrangement of the liquid ejecting device 1 and the holding member 2G.

[0167] 4-6. Sixth Modification

[0168] Figure 31 3H and the liquid ejecting head 1H according to the sixth modification are schematic diagrams. Figure 30 for Figure 30 FIG. 1 is a plan view of the fixing member 3H and the first flange portion 152a of the liquid ejecting head 1H. Figure 31 In the example shown, the engaging portion 32H of the fixing member 3H also functions as an operating portion for rotating the fixing member 3H relative to the liquid ejecting head 1H within the XY plane when fixing the liquid ejecting head 1H.

[0169] Furthermore, the liquid jet head 1H includes a first engaged portion 178 that engages with the engaging portion 32H. The first engaged portion 178 is a convex portion that protrudes from the first flange portion 152a in the Z2 direction.

[0170] Furthermore, the second opening 102 of the liquid ejecting head 1H is configured so that the engaging portion 32H can be inserted therethrough. Figure 31 As shown, the engaging portion 32H is rotatable in the direction indicated by the arrow mark A21 and the direction indicated by the arrow mark A22.

[0171] For example, the engaging portion 32H rotates in the direction indicated by the arrow mark A21 from the state in which it is located in the second opening portion 102, and is located Figure 30 Also, as Figure 31 as well as Figure 32As shown, the engaging portion 32H is engaged with the first engaged portion 178 of the liquid ejecting head 1H. Thus, in the sixth modification, as in the first embodiment, the engaging portion 32H is engaged with the first engaged portion 178 so that the first opening 401 and the third opening 202 are sandwiched between the head portion 31 of the fixing member 3H and the engaging portion 32H, thereby fixing the liquid ejecting head 1H and the holding member 2.

[0172] 4-7. Seventh Modification

[0173] Figure 32 3 is a diagram schematically showing an elastic member 4I according to a seventh modification. Figure 33 The elastic member 4I shown is a flat spring member without a bent portion. Furthermore, the liquid ejecting head 1H has a plurality of protrusions 154 projecting from the first flange portion 152a in the Z2 direction. The elastic member 4I is disposed on the protrusions 154. The use of the elastic member 4I improves the positional accuracy of the liquid ejecting head 1H relative to the holding member 2 compared to the case of using the elastic member 4 of the first embodiment.

[0174] 4-8. Eighth Modification

[0175] Figure 33 3 is a diagram schematically showing an elastic member 4J according to an eighth modification. Figure 34 The elastic member 4J shown has a flat plate portion 44 without a bent portion, and a plurality of protrusions 43 protruding from the flat plate portion 44 in the Z1 direction. The protrusions 43 are in contact with the liquid ejecting head 1. By using the elastic member 4J, the positional accuracy of the liquid ejecting head 1 relative to the holding member 2 can be improved compared to the case of using the elastic member 4 of the first embodiment.

[0176] 4-9. Ninth Modification

[0177] Figure 34 FIG is a plan view schematically showing a fixing member 3K according to a ninth modification. Figure 34 In the illustrated example, the engaging portion 32K of the fixing member 3K has three protrusions 325 extending from the shaft portion 33 on the XY plane in plan view.

[0178] The shape of the "engaging portion" can be any shape as long as it can engage with the "first engaged portion". Figure 34 As shown in FIG. 1 , the engagement portion 32K has a plurality of protrusions 325, thereby reducing the rotation angle of the fixing member 3 in the XY plane compared to the engagement portion 32 of the first embodiment. Although the fixing member 3 is rotated 90° when the liquid ejecting head 1 is fixed to the holding member 2 in the first embodiment, by using Figure 35The fixing member 3K is illustrated so that the rotation angle of the fixing member 3K is, for example, 60°. Thus, the fixing of the liquid ejecting head 1 to the holding member 2 can be implemented more simply.

[0179] Further, as for the "shaft portion", as long as the function thereof is not impaired, the shape thereof when viewed in plan can also be a shape other than a circular shape. Further, as for the "head portion", as long as the function thereof is not impaired, the shape thereof when viewed in plan can also be a shape other than a circular shape.

[0180] 4-10. Tenth Modification

[0181] Figure 35 A schematic diagram of a liquid ejecting apparatus 100L of the tenth modification is shown. ​ The liquid ejecting apparatus 100L is a serial type printing apparatus. The liquid ejecting apparatus 100L is provided with a plurality of liquid ejecting heads 1 arranged in a conveyance direction DM of a medium PP. The plurality of liquid ejecting heads 1 are arranged in the X-axis direction.

[0182] The liquid ejecting apparatus 100L is provided with a head conveyance mechanism 95. The head conveyance mechanism 95 has a carriage 951 and a endless belt 952. The carriage 951 holds the plurality of liquid ejecting heads 1. The carriage 951 is linked to the endless belt 952. The carriage 951 is conveyed by the endless belt 952, and thereby reciprocates in the main scanning direction.

[0183] The liquid ejecting apparatus 100L conveys the medium PP in a sub scanning direction intersecting the main scanning direction, and causes the liquid ejecting heads 1 to reciprocate in the main scanning direction while ejecting ink from the liquid ejecting heads 1, in a case where a printing process is performed. Thereby, an image is printed on the medium PP by forming dots corresponding to print data on the medium PP.

[0184] In the liquid ejecting apparatus 100L which is a serial type printer as such, the liquid ejecting head 1 can be applied.

[0185] 4-11. Other Modifications

[0186] Although the groove 311 is formed at the head portion 31 of the fixing member 3 in the above-described embodiment, the shape of the groove 311 is not particularly limited, and can be, for example, a polygonal shape such as a quadrangular shape and a hexagonal shape, a plus shape, or an I-shaped.

[0187] Further, although the elastic member 4 is a leaf spring in the above-described embodiment, the elastic member 4 can be, for example, a coil spring, a disc spring, a wave washer, or the like. However, by using a leaf spring, it is easy to reduce the distance between the fixing member 3 and the liquid ejecting head 1 compared to the case of using a coil spring. In this case, if the first flange portion 152a is to be disposed in the vicinity of the ejection surface Sll in order to improve positioning accuracy, the distance from the ejection surface Sll in the ejection direction to the first flange portion 152a becomes short. In this case, it is difficult to use a coil spring which requires a certain degree of size in the Zl direction which is the ejection direction. In contrast, since a leaf spring has a high load and its size in the ejection direction is also small, it is more suitable.

[0188] Although two positioning holes 1521 are provided in the second flange portion 152b in the above-described embodiment, the two positioning holes 1521 can be provided in the first flange portion 152a. In this case, the elastic member 4 is disposed between the two positioning holes 1521 when viewed in plan.

[0189] Although the limiting portion 206 is provided in the engaged member 25 in the above-described embodiment, the limiting portion 206 can not be provided in the engaged member 25. By adopting such a configuration, the fixing member 3 can be rotated in either one of the clockwise direction or the counterclockwise direction in the X-Y plane.

[0190] In addition, the above-described embodiments merely show representative modes of the present application, and the present application is not limited to the above-described embodiments, and various modifications and additions can be made within the scope of the present application.

[0191] The liquid ejecting apparatus exemplified in the above-described modes can be used in various apparatuses such as a facsimile apparatus or a copying machine in addition to an apparatus dedicated to printing. Originally, the use of the liquid ejecting apparatus is not limited to printing. For example, a liquid ejecting apparatus which ejects a solution of a color material can be used as a manufacturing apparatus of a color filter for forming a display apparatus such as a liquid crystal display panel. Further, a liquid ejecting apparatus which ejects a solution of a conductive material can be used as a manufacturing apparatus of a wiring and an electrode for forming a wiring substrate. Further, a liquid ejecting apparatus which ejects a solution of an organic substance related to a living organism can be used as a manufacturing apparatus of a biochip, for example.

[0192] Explanation of Symbols

[0193] 1…liquid ejection head; 2…holding member; 3…fixing member; 4…elastic member; 10…head unit; 11…electrical connection portion; 12…flow passage structure; 13…wiring substrate; 14…fixing plate; 15…holder; 19…screw; 21…main body portion; 25…engaged member; 29…screw member; 31…head portion; 32…engagement; 33…shaft portion; 41…base portion; 42…spring portion; 43…projection; 44…flat plate portion; 50…head chip; 51…actuator unit; 52…wiring member; 91…liquid container; 92…circulation mechanism; 93…control unit; 94…medium conveying mechanism; 95…head conveying mechanism; 100…liquid ejection apparatus; 101…opening portion; 102…second opening portion; 103…second engaged portion; 111…relay substrate; 112…connector; 113…cover; 129…flow passage tube; 131…connector; 151…base portion; 152a…first flange portion; 152b…second flange portion; 154…projection; 201…opening portion; 202…third opening portion; 203…first engaged portion; 204…fourth opening portion; 205…fifth opening portion; 206…limiting portion; 210…recess; 211…positioning pin; 290…screw opening portion; 301…first member; 302…second member; 311…groove; 325…protrusion portion; 331…tip portion; 401…first opening portion; 951…carriage; 952…endless belt; 1521…positioning hole; 1522…fixing hole; H2…opening portion; L2a…first column; L2b…second column; PP…medium; S11…ejection face; S12…communicating flow passage; S15…ink introduction passage.

Claims

1. A liquid ejecting apparatus characterized by comprising: Possessing: a liquid ejection head that ejects liquid; a holding member that holds the liquid ejection head; a fixing member that has a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion; an elastic member that has a first opening portion into which the shaft portion is inserted, one of the liquid ejection head and the holding member has a second opening portion into which the shaft portion is inserted, and the other has a first engaged portion that engages with the engaging portion, the engaging portion and the first engaged portion are engaged by sandwiching the first opening portion and the second opening portion between the head portion and the engaging portion, thereby fixing the liquid ejection head and the holding member, the other of the liquid ejection head and the holding member has a third opening portion into which the shaft portion and the engaging portion are inserted, the fixing member is rotated with the shaft portion as a rotation axis in a state where the shaft portion is inserted into the third opening portion, thereby fixing the liquid ejection head and the holding member, a rotation position of the engaging portion into which the third opening portion is inserted, that is, a first position, is different from a rotation position of the engaging portion into which the second opening portion is inserted, that is, a second position.

2. The liquid ejection apparatus according to claim 1, wherein the first engaged portion forms a groove that opens on a face opposite to a face of the third opening portion that is opposite to the second opening portion, the engaging portion is fitted with the first engaged portion by rotating the fixing member with the shaft portion as a rotation axis.

3. The liquid ejection apparatus according to claim 1, wherein the second position is the same as a rotation position of the engaging portion into which the first opening portion is inserted.

4. The liquid ejection apparatus according to any one of claims 1 to 3, wherein the one of the liquid ejection head and the holding member has a second engaged portion that can engage with the engaging portion.

5. The liquid ejection apparatus according to claim 4, wherein a rotation position at which the engaging portion engages with the second engaged portion is the same as the first position.

6. A liquid ejecting apparatus characterized by comprising: Possessing: a liquid ejection head that ejects liquid; a holding member that holds the liquid ejection head; a fixing member that has a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion; an elastic member that has a first opening portion into which the shaft portion is inserted, one of the liquid ejection head and the holding member has a second opening portion into which the shaft portion is inserted, and the other has a first engaged portion that engages with the engaging portion, the engaging portion and the first engaged portion are engaged by sandwiching the first opening portion and the second opening portion between the head portion and the engaging portion, thereby fixing the liquid ejection head and the holding member, the one of the liquid ejection head and the holding member has a second engaged portion that can engage with the engaging portion.

7. The liquid ejection apparatus according to claim 6, wherein the second engaged portion is provided on both faces of the second opening portion.

8. The liquid ejecting apparatus according to claim 1 or 6, wherein the other of the liquid ejecting head and the holding member has a restriction portion that restricts rotation of the fixing member.

9. The liquid ejecting apparatus according to claim 1 or 6, wherein the head portion has a hole or a groove that engages with a tool for rotating the fixing member.

10. The liquid ejecting apparatus according to claim 1 or 6, wherein the head portion is a rod for rotating the fixing member.

11. The liquid ejecting apparatus according to claim 6, wherein the fixing member has a first member having the head portion and a second member having the engaging portion, the first member and the second member are fixed in a state where the shaft portion constituted by at least one of the first member and the second member is inserted into both the first opening portion and the second opening portion.

12. The liquid ejecting apparatus according to claim 1 or 6, wherein the elastic member is separate from the liquid ejecting head and the holding member.

13. The liquid ejecting apparatus according to claim 1 or 6, wherein the second opening portion of the liquid ejecting head and the holding member are formed of materials having different linear expansion coefficients.

14. The liquid ejecting apparatus according to claim 1 or 6, wherein the liquid ejecting head is provided with the second opening portion, the second opening portion is disposed below a direction of gravity with respect to the holding member, the direction of insertion of the fixing member is a direction from below to above the direction of gravity.

15. A fixing method of a liquid ejecting head, characterized by fixing a liquid ejecting head on a holding member using a fixing member having a head portion, an engaging portion, and a shaft portion that connects the head portion and the engaging portion, and an elastic member provided with a first opening portion into which the shaft portion is inserted and abutting against the head portion, in the fixing method of the liquid ejecting head, one of the liquid ejecting head and the holding member has a second opening portion into which the shaft portion is inserted and a second engaging portion that engages with the engaging portion, and the other has a first engaging portion that engages with the engaging portion, the liquid ejecting head is fixed on the holding member by pressing the elastic member with the head portion and engaging the engaging portion and the first engaging portion in such a manner that the first opening portion and the second opening portion are sandwiched between the head portion and the engaging portion, the direction of insertion of the fixing member when the liquid ejecting head and the holding member are fixed is a direction from below to above the direction of gravity, before the engaging portion and the first engaging portion are engaged, the engaging portion and the second engaging portion are engaged by rotating the fixing member around the shaft portion after the fixing member is inserted into the first opening portion and the second opening portion.

16. The fixing method of the liquid ejecting head according to claim 15, wherein The fixing member has a first member having the head portion and a second member having the engaging portion, The first member is fixed to the second member in a state where the shaft portion constituted by at least one of the first member and the second member is inserted through both of the first opening portion and the second opening portion before the engaging portion and the first engaged portion are engaged with each other.

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