Liquid jet head and liquid jet recording device

Abstract

To facilitate visual confirmation of frame ground connection in assembly.SOLUTION: A liquid jet head includes a jet module for jetting liquid, and a conductive connection member for connecting the jet module to a frame ground, wherein at least a part of the connection member is provided outside the jet module.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] An embodiment of the present disclosure relates to a liquid jet head and a liquid jet recording apparatus. [Background technology]

[0002] Patent Document 1 discloses a liquid jet head including a head unit including a flow path unit in which a liquid flow path is formed, a conductive nozzle plate joined to the head unit, a head case to which the nozzle plate and head unit are fixed, and a conductive head cover attached to the head case so as to surround the nozzle plate and head unit from the outside. The head cover has a frame portion formed with an opening that exposes the nozzle plate, and a contact protrusion that protrudes inward from the inner peripheral edge of the frame portion. The head cover is attached to the head case with the contact protrusion abutting against the outer peripheral edge of the nozzle plate. Patent Document 2 discloses a configuration including a main body, an ejection portion capable of ejecting liquid supplied through a liquid flow path, an electric wiring board having a contact portion for receiving signals from the outside, a flow path forming member that forms the liquid flow path, and a conductive leaf spring that is electrically connected to the contact portion. In Patent Document 2, the elastic deformation of the leaf spring ensures the contact pressure necessary for electrical connection between the leaf spring and the contact portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-68981 [Patent Document 2] Patent No. 6504889 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of Patent Document 1, because the contact protrusion is provided on the inside of the head cover, it is difficult to visually confirm whether the contact protrusion is contacting the nozzle plate when viewed from the outside of the head cover. In the case of the configuration of Patent Document 2, it is difficult to visually confirm whether the leaf spring and the contact portion are connected when viewed from the outside of the main body. Furthermore, if the entire connecting member for connecting the main body to the frame ground is provided inside the main body, it becomes difficult to visually confirm the frame ground connection during assembly.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to make it easier to visually check the frame ground connection during assembly. [Means for solving the problem]

[0006] (1) A liquid jet head according to one aspect of the present disclosure includes a jet module that jets liquid and a conductive connecting member that connects the jet module to a frame ground, and at least a portion of the connecting member is located outside the jet module.

[0007] For example, if the entire connecting member for connecting the jet module to a frame ground (hereinafter also referred to as "FG") is provided inside the jet module, it becomes difficult to visually check the FG connection during assembly. In contrast, with the liquid jet head according to this aspect, at least a portion of the connecting member is provided outside the jet module, making it easier to visually check the FG connection during assembly. Furthermore, it is also easy to check continuity even after assembly.

[0008] (2) In the liquid jet head according to the aspect (1), the connection member may be fixed to the outside of the jet module.

[0009] With this configuration, the fixing work can be performed outside the jet module, which contributes to improved workability.

[0010] (3) In the liquid jet head according to the aspect (2), the connection member may be fixed to a side surface of the jet module in the longitudinal direction.

[0011] According to this configuration, since there is no effect on the thickness direction of the liquid jet head, high density can be achieved even when a plurality of liquid jet heads are provided in the thickness direction.

[0012] (4) In the liquid jet head according to any one of (1) to (3), the connecting member may be fixed with a screw.

[0013] According to this configuration, since the screws are used for fixing, electrical continuity can be ensured more reliably.

[0014] (5) In the liquid jet head according to any one of (1) to (4), a stay may be further provided on the outside of the jet module, and a portion of the connecting member may extend outside the stay.

[0015] According to this configuration, a part of the connecting member protrudes outside the stay, making it easy to visually check the FG connection during assembly.

[0016] (6) The liquid jet head according to the aspect (5) may further include a pressing portion that sandwiches and presses the portion of the connecting member that protrudes outside the stay between the connecting member and the stay.

[0017] According to this configuration, the stay and the pressing portion sandwich and fix the connector, which contributes to improving the reliability of the electrical connection.

[0018] (7) In the liquid jet head according to the aspect (5) or (6), the stay may be formed with an opening through which the connecting member passes.

[0019] According to this configuration, a portion of the connecting member can be exposed to the outside of the stay through the opening in the stay.

[0020] (8) The liquid jet head according to aspect (6) or (7) may further include a cover that covers the jet module and the stay, and the pressing portion may constitute a part of the cover.

[0021] According to this configuration, the cover is fixed by being sandwiched between a part of the cover and the stay, so no dedicated fixing parts are required, which contributes to reducing the number of parts.

[0022] (9) The liquid jet head according to any one of (6) to (8) may further include a plate member having the pressing portion.

[0023] This configuration allows for more reliable electrical continuity than when the connection member is directly fixed with a screw.

[0024] (10) A liquid jet recording apparatus according to one aspect of the present disclosure includes the liquid jet head according to any one of aspects (1) to (9).

[0025] According to the liquid jet recording apparatus of this aspect, it is easy to visually check the FG connection during assembly, and it is also easy to check the continuity even after assembly. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic configuration diagram of an inkjet printer according to a first embodiment. [Figure 2] 1 is a perspective view of an inkjet head according to a first embodiment. [Figure 3] FIG. 2 is a perspective view showing a part of the inkjet head according to the first embodiment in an exploded state. [Figure 4] 1 is a perspective view showing a part (FPC unit) of an inkjet head according to a first embodiment exposed. [Figure 5] FIG. 3 is a view taken along arrow V in FIG. 2. [Figure 6] FIG. 2 is a perspective view of a nozzle guard according to the first embodiment. [Figure 7]FIG. 7 is an enlarged view of the boxed area VII in FIG. [Figure 8] 5A and 5B are explanatory diagrams of a conduction path via a base member according to the first embodiment. [Figure 9] 5A and 5B are explanatory diagrams of a conduction path when sandwiched between a cover and a stay according to the first embodiment. [Figure 10] FIG. 10 is a perspective view showing a part of an inkjet head according to a second embodiment in an exploded state. [Figure 11] FIG. 10 is a perspective view showing a mounting portion of a stay and a plate member according to a second embodiment. [Figure 12] 10A and 10B are explanatory diagrams of a conduction path when sandwiched between a plate member and a stay according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In the embodiments and modified examples described below, corresponding components may be designated by the same reference numerals, and their description may be omitted. In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," not only strictly indicate such arrangements, but also indicate a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.

[0028] In the following embodiments, an inkjet printer (hereinafter simply referred to as "printer") that uses ink (liquid) to perform recording on a recording medium will be described as an example of a liquid jet recording apparatus equipped with the liquid jet head of the present disclosure. In the drawings used in the following description, the scale of each component has been appropriately changed so that each component is of a recognizable size.

[0029] First Embodiment <Printer> FIG. 1 is a schematic diagram of the printer 1. As shown in FIG. As shown in FIG. 1, the printer 1 of this embodiment includes a pair of transport mechanisms 2 and 3, an ink supply mechanism 4, inkjet heads 5A and 5B (liquid ejection heads), and a scanning mechanism 6.

[0030] In the following explanation, an X, Y, Z Cartesian coordinate system will be used as necessary. The X direction corresponds to the transport direction of the recording medium P (an example of a medium, such as paper). The Y direction corresponds to the scanning direction of the scanning mechanism 6. The Z direction corresponds to the up-down direction perpendicular to the X and Y directions. In the following explanation, of the X, Y, and Z directions, the arrow directions in the drawings are defined as plus (+) directions, and the directions opposite to the arrows are defined as minus (-) directions. In this embodiment, the +Z direction corresponds to the upward direction in the direction of gravity, and the -Z direction corresponds to the downward direction in the direction of gravity.

[0031] The transport mechanisms 2 and 3 transport the recording medium P in the X direction. Specifically, the transport mechanism 2 includes a grit roller 11 extending in the Y direction, a pinch roller 12 extending parallel to the grit roller 11, and a drive mechanism (not shown) such as a motor that rotates the grit roller 11 about its axis. Similarly, the transport mechanism 3 includes a grit roller 13 extending in the Y direction, a pinch roller 14 extending parallel to the grit roller 13, and a drive mechanism (not shown) that rotates the grit roller 13 about its axis.

[0032] The ink supply mechanism 4 includes an ink tank 15 containing ink, and ink pipes 16 connecting the ink tank 15 to the inkjet heads 5A and 5B. In this embodiment, a plurality of ink tanks 15 are arranged in the X direction. Each ink tank 15 contains ink of one of four colors, for example, yellow, magenta, cyan, and black. The ink pipes 16 are, for example, flexible hoses, and connect the ink tanks 15 to the inkjet heads 5A and 5B.

[0033] The scanning mechanism 6 causes the inkjet heads 5A and 5B to scan back and forth in the Y direction. Specifically, the scanning mechanism 6 includes a pair of guide rails 21 and 22 extending in the Y direction, a carriage 23 movably supported on the pair of guide rails 21 and 22, and a drive mechanism 24 that moves the carriage 23 in the Y direction.

[0034] The drive mechanism 24 is disposed between the guide rails 21 and 22 in the X direction. The drive mechanism 24 includes a pair of pulleys 25 and 26 spaced apart in the Y direction, an endless belt 27 wound between the pair of pulleys 25 and 26, and a drive motor 28 that drives one of the pulleys 26 to rotate.

[0035] The carriage 23 is connected to an endless belt 27. The carriage 23 is mounted with a plurality of inkjet heads 5A, 5B aligned in the Y direction. Each of the inkjet heads 5A, 5B is configured to be capable of ejecting two colors of ink. Therefore, in the printer 1 of this embodiment, each of the inkjet heads 5A, 5B ejects two different colors of ink, thereby enabling the printer 1 to eject four colors of ink: yellow, magenta, cyan, and black.

[0036] <Inkjet head> FIG. 2 is a perspective view of inkjet head 5A. FIG. 3 is a perspective view showing a part of inkjet head 5A disassembled. FIG. 4 is a perspective view showing a part of inkjet head 5A (FPC unit 100) exposed. FIG. 5 is a view taken from arrow V in FIG. 2. FIG. 6 is a perspective view of nozzle guard 40. Note that inkjet heads 5A and 5B have the same configuration except for the color of ink supplied. Therefore, the following description will focus on inkjet head 5A, and a description of inkjet head 5B will be omitted.

[0037] The inkjet head 5A of this embodiment is an electromechanical conversion type inkjet head that ejects ink from a head chip including an actuator plate formed from a piezoelectric element such as PZT (lead zirconate titanate).

[0038] In this inkjet head 5A, to eject ink, a voltage is applied between the electrodes on the drive walls of the ejection channels formed in the actuator plate, causing the drive walls to undergo thickness sliding deformation. This changes the volume within the ejection channels, causing the ink in the ejection channels to be ejected through the nozzle holes. Note that the ink ejection method is not limited to the electromechanical conversion method described above, and may also be an electrification control method, a pressure vibration method, an electrothermal conversion method, an electrostatic suction method, or the like.

[0039] The charge control method applies an electric charge to the material using a charging electrode, and controls the direction of flight of the material using a deflection electrode to eject it from the nozzle.The pressure vibration method applies ultra-high voltage to the material to eject it toward the tip of the nozzle; if no control voltage is applied, the material will be ejected from the nozzle in a straight line, but if a control voltage is applied, electrostatic repulsion occurs between the materials, causing the material to scatter and not be ejected from the nozzle.

[0040] In addition, the electrothermal conversion method uses a heater installed in the space where the material is stored to suddenly vaporize the material, generating bubbles, and the pressure of the bubbles causes the material to be ejected from the space. The electrostatic attraction method applies a small amount of pressure to the space where the material is stored, forming a meniscus of the material in the nozzle, and then applies electrostatic attraction in this state to draw out the material. In addition to these, other technologies that can be applied include a method that uses changes in the viscosity of fluids due to an electric field, and a method that uses discharge sparks to eject the material.

[0041] Referring also to Figures 2 to 6, the inkjet head 5A of this embodiment is configured by mounting jet modules 30A, 30B, 30C (see Figure 3), a nozzle plate 35 (see Figure 5), a nozzle guard 40 (see Figure 6), etc. on a base member 50.

[0042] <Base material> The base member 50 is formed in a shape with its thickness direction in the Z direction and its length direction in the X direction. The base member 50 includes a base main body portion 51 that holds the jet modules 30A, 30B, and 30C, and a carriage fixing portion 52 that fixes the base member 50 to the carriage 23 (see FIG. 1). In this embodiment, the base member 50 is formed separately from the frame 36. For example, the base member 50 may be formed from a metal material such as stainless steel.

[0043] The base main body 51 is formed with a module accommodating section 53 that opens in the Z direction so that each jet module 30A, 30B, and 30C can be accommodated therein. Each jet module 30A, 30B, and 30C can be inserted into the module accommodating section 53. The -Z end of each jet module 30A, 30B, and 30C can be inserted into the module accommodating section 53 from the +Z direction. In this inserted state, each jet module 30A, 30B, and 30C is held in the base main body 51 in a state where it stands upright in the +Z direction from the base member 50.

[0044] The carriage fixing portion 52 protrudes into the XY plane from the +Z direction end of the base main body portion 51. The carriage fixing portion 52 protrudes more outward in the X direction than in the Y direction. Mounting holes and the like are formed in the carriage fixing portion 52 for mounting the base member 50 to the carriage 23 (see FIG. 1).

[0045] <Jet Module> Jet modules 30A, 30B, and 30C are formed in the shape of a plate with the thickness direction in the Y direction and the length direction in the X direction. Jet modules 30A, 30B, and 30C are configured to be able to eject ink supplied from ink tank 15 (see FIG. 1) toward recording medium P. Jet modules 30A, 30B, and 30C are mounted on base member 50 in a line in the Y direction.

[0046] In the inkjet head 5A of this embodiment, the jet modules 30A, 30B, and 30C are all grouped together in a single port, so that they eject ink of a single color. The number of jet modules 30A, 30B, and 30C mounted on the base member 50, as well as the color and type of ink ejected from the jet modules 30A, 30B, and 30C, can be changed as appropriate. The jet modules 30A, 30B, and 30C are mounted on the base member 50 with the jet modules 30A, 30B, and 30C having the same configuration lined up in the Y direction.

[0047] In this embodiment, each of the jet modules 30A, 30B, and 30C is of a so-called edge chute type that ejects ink from the end of the ejection channel in the extension direction (Z direction) (for example, the −Z direction end face of the head chip).

[0048] An FPC unit 100 is supported on the surface of each jet module 30A, 30B, 30C facing the -Y direction. The FPC unit 100 includes a drive substrate 101 and a wiring substrate 102. For example, each of the drive substrate 101 and the wiring substrate 102 is a flexible printed circuit board, and is configured by forming a wiring pattern on a base film. Note that the drive substrate 101 may be configured as a rigid substrate or the like in the portion (mounting portion) where a driver that drives the head chip is mounted.

[0049] The base member 50 is provided with stays 60 that support the components mounted on the base member 50. The stays 60 stand upright in the +Z direction from the base member 50 and surround the peripheries of each of the jet modules 30A, 30B, and 30C.

[0050] <Nozzle plate> In this embodiment, nozzle plate 35 (see FIG. 5) is made of a resin material such as polyimide. Nozzle plate 35 is fixed to the −Z direction end face of base main body 51 and the −Z direction end faces (portions exposed from module accommodating portion 53) of jet modules 30A, 30B, and 30C via an adhesive or the like.

[0051] Nozzle holes (not shown) are formed in the nozzle plate 35, penetrating the nozzle plate 35 in the Z direction. The nozzle holes are formed individually at positions facing the ejection channels of the head chips in the Z direction.

[0052] The nozzle plate 35 is not limited to being made of a resin material. For example, the nozzle plate 35 may be made of silicon, a metal material (such as stainless steel), or a laminated structure of a resin material and a metal material. A single nozzle plate 35 may collectively cover the jet modules 30A, 30B, and 30C, or multiple nozzle plates 35 may individually cover the jet modules 30A, 30B, and 30C.

[0053] <Nozzle guard> The nozzle guard 40 is a metal member that protects the nozzle plate 35. The nozzle guard 40 is formed by subjecting a plate material such as stainless steel to a hybrid process of drawing and bending. The nozzle guard 40 covers the base main body 51 from the -Z direction with the nozzle plate 35 sandwiched therebetween. Note that a frame 36 (an example of a resin housing) made of synthetic resin such as plastic may be provided between the nozzle guard 40 and the base member 50.

[0054] The nozzle guard 40 has exposure holes 41h formed in positions facing the -Z end faces of each jet module 30A, 30B, 30C in the Z direction, which expose the nozzle plate 35 to the outside. The exposure holes 41h penetrate the nozzle guard 40 in the Z direction and are formed as slits extending in the X direction. The exposure holes 41h are formed in three rows spaced apart in the Y direction corresponding to each jet module 30A, 30B, 30C. The nozzle holes described above communicate with the outside of the inkjet head 5A through the exposure holes 41h.

[0055] <Conductive part> Fig. 7 is an enlarged view of the enclosed area VII in Fig. 2. Fig. 8 is an explanatory diagram of the conduction path via the base member 50. In Fig. 8, the frame body 36 provided between the nozzle guard 40 and the base member 50 is not shown. 7 and 8, the inkjet head 5A comprises a base member 50, jet modules 30A, 30B, and 30C mounted on the base member 50 and for ejecting ink, a nozzle plate 35 having nozzle holes for ejecting ink, a metallic nozzle guard 40 for protecting the nozzle plate 35, and a conductive conducting part 43 that is electrically connected to the jet modules 30A, 30B, and 30C and the nozzle guard 40 via the base member 50 and that connects the nozzle guard 40 to an FG.

[0056] Conductive portion 43 is fixed outside jet modules 30A, 30B, and 30C. Specifically, conductive portion 43 is fixed outside the outer ends of jet modules 30A, 30B, and 30C in the X direction.

[0057] Conductive portion 43 is fixed to the side surfaces of jet modules 30A, 30B, and 30C in the longitudinal direction (X direction). However, conductive portion 43 is not fixed to the side surfaces of jet modules 30A, 30B, and 30C in the thickness direction (Y direction).

[0058] 6, at least the corners of the nozzle guard 40 have drawn portions 45. The nozzle guard 40 includes a plate-shaped guard main body 41 whose thickness direction is the Z direction and whose longitudinal direction is the X direction, and upright portions 42 that stand in the +Z direction from the outer periphery of the guard main body 41. When the nozzle guard 40 is viewed from the Z direction, the drawn portions 45 are provided at the four corners of a rectangle whose longitudinal direction is the X direction.

[0059] The side surface of the nozzle guard 40 has a bent portion 46. The bent portion 46 is provided between the portion (flat portion) of the upright portion 42 excluding the corners and the guard main body 41. The upright portion 42 stands in the +Z direction from each of the X-direction outer edge and the Y-direction outer edge of the guard main body 41 via the bent portion 46.

[0060] A notch 47 is formed at the boundary between the drawn portion 45 and the bent portion 46 of the nozzle guard 40. The notch 47 is formed to a size that allows liquid that has entered the drawn portion 45 to be discharged. The notches 47 are formed in four locations corresponding to the drawn portions 45 provided at the four corners. Each notch 47 is formed at a position more inward in the Y direction than the corresponding drawn portion 45. Each notch 47 is formed to be longer in the Z direction than in the X direction, and is open in the Y direction.

[0061] The conductive portion 43 is formed integrally with the side surface of the nozzle guard 40 using the same material. The side surface of the nozzle guard 40 including the conductive portion 43 is formed in an L shape when viewed from the X direction. A screw hole 43h that penetrates the conductive portion 43 in the X direction is formed in the end portion of the conductive portion 43 in the +Z direction.

[0062] At both ends of the nozzle guard 40 in the X direction, the portions where the screw holes 43h of the conductive portion 43 are formed are staggered in the Y direction. The portion where the screw holes 43h of the conductive portion 43 on the +X direction end side are formed at a position shifted toward the +Y direction from the center position of the nozzle guard 40 in the Y direction. On the other hand, the portion where the screw holes 43h of the conductive portion 43 on the −X direction end side are formed at a position shifted toward the −Y direction from the center position of the nozzle guard 40 in the Y direction.

[0063] Referring also to FIG. 7, the conductive portion 43 is fixed to the outside of the jet modules 30A, 30B, and 30C at a portion that extends straight from the nozzle guard 40 upward above the base member 50. An opening 52h through which the conductive portion 43 passes is formed in the base member 50. The opening 52h penetrates the carriage fixing portion 52 of the base member 50 in the Z direction. The opening 52h is formed in the shape of a slit that follows the outer periphery of the conductive portion 43 when viewed from the Z direction and extends in the Y direction. The conductive portion 43 extends straight in the +Z direction through the opening 52h formed in the carriage fixing portion 52.

[0064] The conductive part 43 is fixed with a screw 67. For example, the screw 67 is threaded from the outside in the X direction through a screw hole 43h of the conductive part 43 into a female screw 65 formed at the end of the stay 60 in the -Z direction. This allows the conductive part 43 to be fixed to the stay 60 with the screw 67.

[0065] Conductive portion 43 is fixed to the same member as the grounded portion of drive substrate 101 of jet modules 30A, 30B, and 30C. The grounded portion of drive substrate 101 corresponds to, for example, a portion of drive substrate 101 that serves as a reference ground (a portion that functions as a reference plane for potential). Drive substrate 101 may be provided with a pattern wiring that serves as the reference ground. In this case, conductive portion 43 may be connected to the pattern wiring formed on drive substrate 101.

[0066] Referring to Figure 8, in this embodiment, a conductive path is formed through the base member 50 by providing a conductive conductive portion 43 that is electrically connected to the jet modules 30A, 30B, 30C and the nozzle guard 40 via the base member 50 and connects the nozzle guard 40 to the FG.

[0067] This conductive path is formed by including the path of arrow V1 along the conductive portion 43 of the nozzle guard 40, the path of arrow V2 along the grounding portion of the drive substrate 101, the path of arrow V3 along the carriage fixing portion 52 of the base member 50, and a path on the device side (not shown) that passes through the carriage 23 (see Figure 1).

[0068] <Connection parts> FIG. 9 is an explanatory diagram of a conduction path when sandwiched between the cover 80 and the stay 60. 3, 4, and 9, inkjet head 5A includes jet modules 30A, 30B, and 30C that eject ink, and a conductive connecting member 70 that connects jet modules 30A, 30B, and 30C to FG. At least a portion of connecting member 70 is provided outside jet modules 30A, 30B, and 30C.

[0069] Connection member 70 is fixed outside jet modules 30A, 30B, and 30C. Specifically, connection member 70 is fixed outside the outer ends of jet modules 30A, 30B, and 30C in the X direction.

[0070] The connection members 70 are fixed to the side surfaces of the jet modules 30A, 30B, and 30C in the longitudinal direction (X direction). In this embodiment, the connection members 70 are formed of leaf springs. The connection members 70 are formed by bending a plate material such as stainless steel.

[0071] The connecting member 70 is formed in a shape in which a portion formed in an L-shape when viewed from the Y direction and a portion formed in an L-shape when viewed from the X direction are integrated. The connecting member 70 is fixed with a screw or the like to the corner of the +Z direction end of the +X direction end of the drive substrate 101 when viewed from the -Y direction. Three connecting members 70 are provided corresponding to each of the jet modules 30A, 30B, and 30C. The connecting members 70 have the same configuration and are lined up in the Y direction.

[0072] Specifically, each connecting member 70 includes a first extending portion 71 that extends from a fixed portion with drive substrate 101 outward in the +X direction beyond the outer edge of drive substrate 101 in the +X direction and then extends in the -Z direction, a second extending portion 72 that extends in the +Y direction from the -Z direction end of first extending portion 71 to a position facing the +X direction end face of jet module 30A, 30B, 30C, and a third extending portion 73 that extends obliquely from the +Y direction end of second extending portion 72 toward the +X direction and the +Z direction and then extends straight in the +Z direction. Each connecting member 70 is configured to apply a biasing force in at least the X direction between jet modules 30A, 30B, 30C and pressing portion 83.

[0073] The stay 60 is disposed outside the jet modules 30A, 30B, and 30C. A portion of the connecting member 70 protrudes outside the stay 60. An opening 61h through which the connecting member 70 passes is formed in the stay 60. A female thread 66 is formed on the −Z direction side of the opening 61h of the stay main body 61.

[0074] Specifically, the stay 60 includes a plate-shaped stay main body 61 whose thickness direction is in the X direction and whose longitudinal direction is in the Z direction, and protruding portions 62 that protrude inward in the X direction from both Y-direction outer end edges of the stay main body 61. The stay main body 61 is formed with an opening 61h that allows a portion of the connecting member 70 (a portion of the third extending portion 73 on the X-direction outer end side) to extend further toward the +X direction than the stay main body 61. The opening 61h is formed in the shape of a slit that penetrates the stay main body 61 in the X direction and extends in the Y direction. A portion of each connecting member 70 protrudes further toward the +X direction than the stay main body 61 through the opening 61h. A pair of female threads 66 are formed with a gap in the Y direction.

[0075] The inkjet head 5A includes a retaining portion 83 that sandwiches and holds down the portion of the connecting member 70 that protrudes outside the stay 60 between the stay 60 and the retaining portion 83. The portion of each connecting member 70 that protrudes outside the stay 60 is sandwiched between the retaining portion 83 and the stay 60.

[0076] The inkjet head 5A includes a cover 80 that covers the jet modules 30A, 30B, and 30C and the stay 60. The pressing portion 83 forms a part of the cover 80.

[0077] The cover 80 is formed in a shape that opens in the -Z direction, and covers the upper parts of the jet modules 30A, 30B, 30C, etc. from the +Z direction. Specifically, the cover 80 includes a cover main body 81 that is formed in a box shape with the X direction as its longitudinal direction and that opens in the -Z direction, and extensions 82 that extend in the -Z direction from both outer ends of the cover main body 81 in the X direction.

[0078] The cover main body 81 is formed with through holes and the like for exposing ports for inflowing ink, connectors, etc. in the +Z direction. A portion of the extending portion 82 is configured as a pressing portion 83. A screw hole 82h that penetrates the extending portion 82 in the X direction is formed in the end portion of each extending portion 82 in the -Z direction. A pair of screw holes 82h are formed with a gap in the Y direction. The screw holes 82h are formed at positions corresponding to the female threads 66 (positions that overlap with the female threads 66 when viewed from the X direction when the cover 80 is assembled).

[0079] The connecting members 70 are fixed with screws 68. For example, with a portion of each connecting member 70 protruding outside the stay 60, the screws 68 are threaded from the outside in the X direction through the screw holes 82h of the extension portions 82 of the cover 80 into the female threads 66 of the stay main body portion 61. This allows the extension portions 82 to be fixed to the stay 60 with the screws 68, and also allows the portions of each connecting member 70 protruding outside the stay 60 to be sandwiched and held between the stay 60 and the holding portion 83. In this embodiment, the portions of each connecting member 70 protruding outside the stay 60 can be held together between the stay 60 and the holding portion 83 of the cover 80 by the holding portion 83 of the cover 80.

[0080] Referring to Figure 9, this embodiment includes a conductive connecting member 70 for connecting the jet modules 30A, 30B, and 30C to the FG, and a holding portion 83 for clamping and holding the portion of the connecting member 70 that protrudes outside the stay 60 between the stay 60 and the holding portion 83, and the holding portion 83 forms part of the cover 80, thereby forming a conductive path by clamping between the cover 80 and the stay 60.

[0081] <How the printer works> A method for recording information on a recording medium P using the above-described printer 1 will be described. 1, when the printer 1 is operated, the grit rollers 11 and 13 of the conveyance mechanisms 2 and 3 rotate, thereby conveying the recording medium P in the +X direction between the grit rollers 11 and 13 and the pinch rollers 12 and 14. At the same time, the drive motor 28 rotates the pulley 26 to move the endless belt 27. As a result, the carriage 23 moves back and forth in the Y direction while being guided by the guide rails 21 and 22. During this time, a drive voltage is applied to the drive electrodes of the head chips in each of the inkjet heads 5A and 5B. This causes thickness shear deformation in the drive walls, generating pressure waves in the ink filled in the ejection channels. This pressure wave increases the internal pressure of the ejection channels, causing the ink to be ejected through the nozzle holes. The ink then lands on the recording medium P, recording various types of information on the recording medium P.

[0082] <Action and effect> The inkjet heads 5A, 5B of this embodiment comprise a base member 50, jet modules 30A, 30B, 30C mounted on the base member 50 and for ejecting ink, a nozzle plate 35 having nozzle holes for ejecting ink formed therein, a metallic nozzle guard 40 for protecting the nozzle plate 35, and a conductive conducting part 43 that is electrically connected to the jet modules 30A, 30B, 30C and the nozzle guard 40 via the base member 50 and that connects the nozzle guard 40 to an FG.

[0083] With this configuration, the nozzle guard 40 can be short-circuited to have the same potential as FG so that static electricity from the media does not fall on the electrodes through the nozzle holes, etc. Therefore, damage to the inkjet heads 5A and 5B due to static electricity can be prevented.

[0084] In this embodiment, the conductive portion 43 is fixed outside the jet modules 30A, 30B, and 30C. According to this configuration, the fixing work can be performed outside jet modules 30A, 30B, and 30C, which contributes to improving workability.

[0085] In this embodiment, the conductive portion 43 is fixed to the side surface in the longitudinal direction of the jet modules 30A, 30B, and 30C. According to this configuration, since there is no effect on the thickness direction of the inkjet heads 5A and 5B, high density can be achieved even when a plurality of inkjet heads 5A and 5B are provided in the thickness direction.

[0086] The conductive portion 43 in this embodiment is fixed with a screw 67 . According to this configuration, since the screws are used for fixing, electrical continuity can be ensured more reliably.

[0087] In this embodiment, the conductive portion 43 is fixed to the same member as the grounded portion of the drive substrate 101 of the jet modules 30A, 30B, and 30C. According to this configuration, the common grounding portion can be reliably set to the same potential as the drive substrate 101 without going through other members. Furthermore, this has the effect of preventing noise.

[0088] In the present embodiment, the base member 50 has an opening 52h through which the conductive portion 43 passes. This configuration contributes to shortening the conduction path because jet modules 30A, 30B, 30C and nozzle guard 40 can be electrically connected through opening 52h in base member 50. Furthermore, even if part of base member 50 is non-metallic, nozzle guard 40 can be at the same potential as FG.

[0089] At least the corners of the nozzle guard 40 of this embodiment have drawn portions 45 that have been subjected to drawing. This configuration can prevent gaps from occurring at least at the corners of the nozzle guard 40.

[0090] The side surface of the nozzle guard 40 of this embodiment has a bent portion 46 that has been bent. According to this configuration, even in the portions where the length cannot be increased by drawing alone, it is possible to extend the length by bending, so that electrical continuity can be achieved at the side portions.

[0091] In this embodiment, a notch 47 is formed at the boundary between the drawn portion 45 and the bent portion 46 of the nozzle guard 40 . According to this configuration, liquid that has entered the drawn portion 45 can be discharged through the notch 47 of the nozzle guard 40. In addition, even when the nozzle guard 40 is made by a hybrid of drawing and bending, the presence of the notch 47 makes the processing easy.

[0092] The conductive portion 43 in this embodiment is formed integrally with the side surface portion of the nozzle guard 40 using the same material. This configuration does not require a dedicated conductive component, which contributes to reducing the number of components.

[0093] In this embodiment, the conductive portion 43 extends in a straight line from the nozzle guard 40 upward beyond the base member 50 and is fixed outside the jet modules 30A, 30B, and 30C. This configuration saves space in the installation surface direction compared to when widened portions extending in the installation surface direction of the inkjet heads 5A, 5B are provided for fixing them. Also, a resin housing can be provided between the nozzle guard 40 and the base member 50, which contributes to cost reduction compared to when a metal housing is provided.

[0094] The printer 1 of this embodiment is equipped with the inkjet heads 5A and 5B described above. This configuration provides a printer 1 that can prevent damage to the inkjet heads 5A and 5B due to static electricity.

[0095] Incidentally, when the cover part that protects the nozzle plate is made of a conductive metal, if the cover part is not electrically connected to other parts, it is preferable that the potential be the same as that of FG for the following reasons. (1) To prevent static electricity from the media from flowing through the nozzle hole to an electrode (for example, a common electrode), the nozzle guard is short-circuited and connected to ground. (2) To prevent noise from having adverse effects, the return current path for noise generated during operation (the path from the nozzle guard to the drive board) must be kept as short as possible. (3) When connected via ink, the nozzle guard must not be electrically floating in order to prevent metal corrosion due to the potential difference between the nozzle guard and an electrode (for example, a common electrode).

[0096] In the above-described embodiment, the jet modules 30A, 30B, and 30C and the nozzle guard 40 are electrically connected to each other via the base member 50. The conductive conductor 43 is provided for connecting the nozzle guard 40 to the FG. The conductive conductor 43 extends in a straight line from the nozzle guard 40 upward beyond the base member 50 and is fixed outside the jet modules 30A, 30B, and 30C. This configuration (A) prevents damage to the inkjet heads 5A and 5B due to static electricity, (B) reduces the effects of noise during printing, and (C) prevents metal corrosion of the nozzle guard 40. Furthermore, (D) it is possible to save space in the installation surface direction, thereby reducing the size of the carriage 23, contributing to a more compact device and a lower cost conveyance system. Furthermore, (E) it is possible to achieve the effects (A) to (D) above while maintaining the strength of the inkjet heads 5A and 5B.

[0097] Inkjet heads 5A, 5B of this embodiment include jet modules 30A, 30B, 30C that eject ink, and conductive connection members 70 that connect jet modules 30A, 30B, 30C to FG. At least a portion of connection members 70 is provided outside jet modules 30A, 30B, 30C.

[0098] For example, if the entire connecting member for connecting the jet module to the FG were located inside the jet module, visual confirmation of the FG connection would be difficult during assembly. In contrast, with this configuration, at least a portion of connecting member 70 is located outside jet modules 30A, 30B, and 30C, making it easier to visually confirm the FG connection during assembly. Also, it is easy to check continuity even after assembly.

[0099] The connecting member 70 of this embodiment is fixed to the outside of the jet modules 30A, 30B, and 30C. According to this configuration, the fixing work can be performed outside jet modules 30A, 30B, and 30C, which contributes to improving workability.

[0100] The connection members 70 of this embodiment are fixed to the side surfaces of the jet modules 30A, 30B, and 30C in the longitudinal direction. According to this configuration, there is no effect on the thickness direction of jet modules 30A, 30B, and 30C, so that high density can be achieved even when a plurality of jet modules 30A, 30B, and 30C are provided in the thickness direction.

[0101] The connecting member 70 of this embodiment is fixed with a screw 68 . According to this configuration, since the screws are used for fixing, electrical continuity can be ensured more reliably.

[0102] Inkjet heads 5A and 5B of this embodiment include a stay 60 disposed outside jet modules 30A, 30B, and 30C. A portion of connecting member 70 protrudes outside stay 60. According to this configuration, a part of the connecting member 70 protrudes outside the stay 60, making it easy to visually check the FG connection during assembly.

[0103] The inkjet heads 5A and 5B of this embodiment include a pressing portion 83 that sandwiches and presses the portion of the connecting member 70 that protrudes outside the stay 60 between the connecting member 70 and the stay 60. According to this configuration, the stay 60 and the pressing portion 83 are clamped and fixed, which contributes to improving the reliability of the electrical connection.

[0104] The stay 60 of this embodiment is formed with an opening 61h through which the connecting member 70 passes. According to this configuration, a part of the connecting member 70 can be exposed to the outside of the stay 60 through the opening 61 h of the stay 60 .

[0105] Inkjet heads 5A, 5B of this embodiment include a cover 80 that covers jet modules 30A, 30B, 30C and stay 60. Pressing portion 83 constitutes a part of cover 80. According to this configuration, the cover 80 is fixed by being sandwiched between a part of the cover 80 and the stay 60, so no dedicated fixing parts are required, which contributes to reducing the number of parts.

[0106] The printer 1 of this embodiment is equipped with the inkjet heads 5A and 5B described above. This configuration makes it easy to visually check the FG connection during assembly, and also makes it easy to check continuity after assembly.

[0107] In industrial inkjet printers, the media surface can become charged as ink is sprayed, potentially causing electrostatic discharge in the inkjet head. Furthermore, large drive noise can be generated when the actuator used in the inkjet head is driven. In this case, the drive noise can cause other inkjet heads inside the inkjet printer to malfunction. To avoid these problems, Patent Documents 1 and 2 disclose configurations. However, in the configuration of Patent Document 1, because the abutment protrusion is provided on the inside of the head cover, it is difficult to visually confirm whether the abutment protrusion is abutting against the nozzle plate when viewed from the outside of the head cover. In the configuration of Patent Document 2, it is difficult to visually confirm whether the leaf spring and the contact portion are connected when viewed from the outside of the main body. Furthermore, if the entire connecting member for connecting the main body to the frame ground is provided inside the main body, it becomes difficult to visually confirm the frame ground connection during assembly. Furthermore, if electrical connection is ensured solely by the elastic restoring force of the leaf spring, there is a concern that the connection may become unstable due to vibrations during transportation or vibrations of the device.

[0108] In contrast, the present embodiment described above includes a conductive connection member 70 for connecting jet modules 30A, 30B, and 30C to the FG, a stay 60 disposed outside jet modules 30A, 30B, and 30C, and a cover 80 covering jet modules 30A, 30B, and 30C and stay 60. A portion of connection member 70 protrudes outside stay 60, and cover 80 includes a retaining portion 83 that sandwiches and holds the portion of connection member 70 that protrudes outside stay 60 between stay 60 and cover 80. As a result, (A) having a portion of connection member 70 protruding outside stay 60 makes it easier to visually confirm the FG connection during assembly, and (B) a portion of connection member 70 is sandwiched and fixed between stay 60 and retaining portion 83 of cover 80, contributing to improved reliability of the electrical connection. Furthermore, (C) the sandwiched fixation improves resistance to external factors such as device vibration. Furthermore, (D) when three or more jet modules 30A, 30B, and 30C are mounted, it is easier to establish an FG connection for the jet module (for example, jet module 30B) that is positioned closer to the center.

[0109] <Modification> The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the above-described embodiment, the conductive portion is fixed to the outside of the jet module, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed to the inside of the jet module.

[0110] In the above-described embodiment, the conductive portion is fixed to the side surface of the jet module in the longitudinal direction, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed to the side surface of the jet module in the thickness direction.

[0111] In the above-described embodiment, the conductive portion is fixed with a screw, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed via a biasing member such as a spring, or may be fixed with a conductive adhesive or the like.

[0112] In the above-described embodiment, the conductive portion is fixed to the same member as the ground portion of the drive substrate of the jet module, but this is not a limitation. For example, the conductive portion may be fixed to a member different from the ground portion of the drive substrate of the jet module (through another member). The manner in which the conductive portion is fixed can be changed according to the design specifications.

[0113] In the above-described embodiment, a configuration in which an opening through which the conductive portion passes is formed in the base member has been described, but this configuration is not limited to this. For example, the base member may not have an opening, and the conductive portion may extend to bypass the base member to electrically connect the jet module and the nozzle guard. The manner in which the opening in the base member is formed and / or the manner in which the conductive portion extends can be changed according to design specifications.

[0114] In the above-described embodiment, at least the corners of the nozzle guard have drawn portions formed by drawing, but this is not limiting. For example, the corners of the nozzle guard may have bent portions formed by bending.

[0115] In the above-described embodiment, the side surface of the nozzle guard has a bent portion formed by bending, but this is not limiting. For example, the side surface of the nozzle guard may have a drawn portion formed by drawing. The form of the drawn portion and / or the bent portion can be changed according to the design specifications.

[0116] In the above-described embodiment, a configuration in which a notch is formed at the boundary between the drawn portion and the bent portion of the nozzle guard has been described, but this configuration is not limited to this. For example, the boundary between the drawn portion and the bent portion of the nozzle guard may have a buried portion that fills the gap at the boundary. The form of the notch can be changed according to design specifications.

[0117] In the above-described embodiment, the conductive portion is integrally formed with the side surface of the nozzle guard using the same material, but this is not limiting. For example, the conductive portion may be formed with a different material from the side surface of the nozzle guard and be integrally connected to the side surface of the nozzle guard. For example, the conductive portion may be formed with the same material as the side surface of the stay and be integral with the stay. The form of the conductive portion can be changed depending on the design specifications.

[0118] In the above-described embodiment, the conductive portion is fixed to the outside of the jet module at a portion that extends straight from the nozzle guard upward beyond the base member, but this is not limiting. For example, a widened portion that extends toward the installation surface of the inkjet head may be provided for fixing.

[0119] In the above-described embodiment, the connecting member is fixed to the outside of the jet module, but this is not limiting. For example, the connecting member may be fixed to the inside of the jet module.

[0120] In the above-described embodiment, the connecting member is fixed to the side surface of the jet module in the longitudinal direction, but this is not limiting. For example, the connecting member may be fixed to the side surface of the jet module in the thickness direction.

[0121] In the above-described embodiment, the connecting members are fixed with screws, but the present invention is not limited to this configuration. For example, the connecting members may be fixed via a biasing member such as a spring, or may be fixed with a conductive adhesive or the like.

[0122] In the above-described embodiment, the inkjet head includes a stay disposed outside the jet module, and a portion of the connecting member extends outside the stay. However, the present invention is not limited to this configuration. For example, the entire connecting member may be disposed inside the stay. For example, the stay may not be disposed outside the jet module. The installation mode of the stay and / or the arrangement mode of the connecting member can be changed according to design specifications.

[0123] In the above-described embodiment, the inkjet head is described as having a configuration including a pressing portion that sandwiches and presses the portion of the connecting member that protrudes outside the stay between the connecting member and the stay. However, the configuration is not limited to this. For example, the portion of the connecting member that protrudes outside the stay may be fixed only to the stay. For example, the pressing portion that presses the portion of the connecting member that protrudes outside the stay may not be provided. The manner in which the connecting member is fixed and / or the manner in which the pressing portion is provided can be changed according to design specifications.

[0124] In the above-described embodiment, the stay has an opening formed therein through which the connecting member passes, but this is not limiting. For example, the stay may not have an opening, and a portion of the connecting member may extend outside the stay, bypassing the stay. The manner in which the opening is formed in the stay and / or the manner in which the connecting member extends can be changed according to design specifications.

[0125] In the above-described embodiment, the inkjet head includes a cover that covers the jet module and the stay, and the retainer constitutes part of the cover. However, the present invention is not limited to this configuration. For example, the retainer may be formed of a separate member from the cover. For example, the cover that covers the jet module and the stay may not be provided. The installation form of the cover and / or the configuration form of the retainer can be changed according to design specifications.

[0126] Second Embodiment Fig. 10 is a perspective view showing a part of the inkjet head in an exploded state. Fig. 11 is a perspective view showing the attachment portion of stay 260 and plate member 290. Fig. 12 is an explanatory diagram of the conduction path when sandwiched between plate member 290 and stay 260. In the first embodiment described above, an example has been given in which a conductive path is formed by sandwiching the cover 80 and the stay 60, but this is not limiting. For example, as shown in Fig. 12, a conductive path may be formed by sandwiching the plate member 290 and the stay 260. In the second embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0127] 10 to 12, stay 260 is disposed outside the jet module. A portion of connecting member 70 protrudes outside stay 260. Stay 260 is formed with openings 261h through which each connecting member 70 passes.

[0128] The stay 260 includes a stay main body 261 formed in a plate shape with its thickness direction in the X direction and its longitudinal direction in the Z direction, and protruding portions 262 protruding inward in the X direction from both outer end edges of the stay main body 261 in the Y direction. The stay main body 261 is formed with openings 261h that allow a portion of each connecting member 70 (a portion of the third extending portion 73 on the outer end side in the X direction) to extend further toward the +X direction than the stay main body 261. Each opening 261h penetrates the stay main body 261 in the X direction and is formed in a rectangular shape with rounded corners when viewed from the X direction. A portion of each connecting member 70 protrudes further toward the +X direction than the stay main body 261 through each opening 261h.

[0129] The inkjet head includes a retaining portion 293 that sandwiches and holds down the portion of the connecting member 70 that protrudes outside the stay 260 between the stay 260 and the retaining portion 293. The portion of each connecting member 70 that protrudes outside the stay 260 is sandwiched between the retaining portion 293 and the stay 260.

[0130] The inkjet head includes a plate member 290 having a pressing portion 293. The pressing portion 293 constitutes a part of the plate member 290. The pressing portion 293 is formed on the end side of the plate member 290 in the +Z direction.

[0131] Three plate members 290 are provided at intervals in the Y direction corresponding to each connecting member 70. The plate members 290 are formed in an L shape with the Z direction as the longitudinal direction. Specifically, the plate member 290 includes a plate main body portion 291 formed in a plate shape with the X direction as the thickness direction and the Z direction as the longitudinal direction, and a protrusion portion 292 protruding from the +Z direction end of the plate main body portion 291 in the -X direction.

[0132] A portion of the plate main body 291 is composed of a pressing portion 293. The pressing portion 293 is formed on the +Z direction end portion of the plate main body 291. A screw hole 291h that penetrates the plate main body 291 in the X direction is formed on the -Z direction end portion of the plate main body 291. The portion where the screw hole 291h is formed is wider in the Y direction than the +Z direction portion of the plate main body 291.

[0133] The stay main body 261 has through holes 261i formed in a portion on the +Z direction side of each opening 261h, which allow the protruding portion 292 of the plate member 290 to protrude further in the -X direction than the stay main body 261. Each through hole 261i penetrates the stay main body 261 in the X direction and is formed in a rectangular shape with rounded corners when viewed from the X direction. Each through hole 261i is formed to be smaller than each opening 261h.

[0134] A female screw 266 is formed on the −Z direction side of each opening 261h of the stay 260. The female screw 266 is arranged on a Z direction line passing through the center position of each opening 261h in the Y direction, and three female screws 266 are formed at intervals in the Y direction.

[0135] The connecting members 70 are fixed with screws 268. For example, with a portion of each connecting member 70 protruding outside the stay 260, the screws 268 are threaded from the outside in the X direction through the screw holes 291h of each plate main body portion 291 and into the female threads 266 of the stay 260. This allows the plate main body portion 291 to be fixed to the stay 260 with the screws 268, and also allows the portion of each connecting member 70 protruding outside the stay 260 to be sandwiched and held between the stay 260 and the holding portion 293. In this embodiment, the portion of each connecting member 70 protruding outside the stay 260 can be individually held between the stay 260 and the holding portion 293 of each plate member 290.

[0136] Referring to Figure 12, this embodiment includes a conductive connecting member 70 for connecting the jet module to the FG, and a holding portion 293 for clamping and holding the portion of the connecting member 70 that protrudes outside the stay 260 between the connecting member 70 and the stay 260, and the holding portion 293 forms part of the plate member 290, thereby forming a conductive path by clamping between the plate member 290 and the stay 260.

[0137] The inkjet head of this embodiment includes a plate member 290 having a pressing portion 293 . This configuration allows for more reliable electrical continuity compared to when the connection member 70 is directly fixed with a screw.

[0138] (Other variations) The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, in the above-described embodiment, an inkjet printer has been described as an example of a liquid jet recording apparatus, but the liquid jet recording apparatus is not limited to a printer. For example, the liquid jet recording apparatus may be a fax machine, an on-demand printer, or the like. In the above-described embodiment, a configuration in which the inkjet head moves relative to the recording medium during printing (a so-called shuttle machine) has been described as an example, but the present disclosure is not limited to this configuration. The configuration according to the present disclosure may also be employed in a configuration in which the inkjet head is fixed and the recording medium moves relative to the inkjet head (a so-called fixed head machine). In the above-described embodiment, the recording medium is paper, but the present invention is not limited to this configuration. The recording medium is not limited to paper, and may be metal or resin material, food, or the like. In the above-described embodiment, a configuration in which the liquid jet head is mounted on a liquid jet recording apparatus has been described, but the present invention is not limited to this configuration. That is, the liquid jetted from the liquid jet head is not limited to the liquid that lands on a recording medium, but may be, for example, a medicinal liquid to be mixed into a medicine, a food additive such as a seasoning or flavoring to be added to food, or an aromatic to be sprayed into the air. In the above-described embodiment, the Z direction coincides with the direction of gravity, but the present invention is not limited to this configuration. For example, the Z direction may coincide with the horizontal direction.

[0139] In the above-described embodiment, a configuration in which three jet modules are mounted on the base member has been described, but the configuration is not limited to this. The number of jet modules mounted on the base member may be one, two, or four or more.

[0140] In the above-described embodiment, an edge-chute jet module (head chip) has been described, but the present invention is not limited to this. For example, the present invention may be applied to a so-called side-chute type head chip that ejects ink from the center of the ejection channel in the extension direction. The present invention may also be applied to a so-called roof chute type head chip in which the direction of pressure applied to ink and the direction of ink ejection are the same.

[0141] In the above-described embodiment, the inkjet head includes a base member, a jet module mounted on the base member and configured to eject liquid, a nozzle plate having nozzle holes for ejecting the liquid, a metal nozzle guard protecting the nozzle plate, and a conductive conductor that is electrically connected to the jet module and the nozzle guard via the base member and connects the nozzle guard to the FG. However, the inkjet head is not limited to this configuration. For example, the metal nozzle guard that protects the nozzle plate may not be provided. For example, the conductive conductor that connects the nozzle guard to the FG may not be provided. The installation manner of the nozzle guard and / or the conductive conductor may be changed depending on the design specifications. That is, a liquid jet head according to one aspect of the present disclosure includes a jet module that ejects liquid and a conductive connecting member that connects the jet module to a frame ground, and at least a portion of the connecting member may be provided outside the jet module.

[0142] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described modified examples may be combined as appropriate, as long as this does not deviate from the spirit of the present invention.

[0143] Although preferred embodiments and modifications of the present disclosure have been described and illustrated above, it should be understood that these are illustrative of the present disclosure and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present disclosure. Therefore, the present disclosure should not be considered limited by the foregoing description, but rather by the scope of the claims. [Explanation of symbols]

[0144] 1... Printer (liquid jet recording device) 5A, 5B ... Inkjet head (liquid jet head) 30A, 30B, 30C ... Jet module 60... Stay 61h … opening 68...Screw 70 ... Connecting member 80... Cover 83 ... clamping part 260 … Stay 261h … opening 290 ... Plate member 293 ... Clamping part

Claims

1. a jet module that sprays liquid; a conductive connecting member for connecting the jet module to a frame ground, At least a portion of the connecting member is provided outside the jet module. Liquid injection head.

2. The connecting member is fixed outside the jet module. The liquid jet head according to claim 1 .

3. The connecting member is fixed to a side surface of the jet module in the longitudinal direction. The liquid jet head according to claim 2 .

4. The connecting member is fixed with a screw. The liquid jet head according to claim 1 .

5. a stay disposed on the outside of the jet module; A portion of the connecting member protrudes outside the stay. The liquid jet head according to claim 1 .

6. The connecting member further includes a pressing portion that sandwiches and presses a portion of the connecting member that protrudes outside the stay between the connecting member and the stay. The liquid jet head according to claim 5 .

7. The stay has an opening through which the connecting member passes. The liquid jet head according to claim 5 .

8. a cover that covers the jet module and the stay; The pressing portion constitutes a part of the cover. The liquid jet head according to claim 6 .

9. Further provided is a plate member having the pressing portion. The liquid jet head according to claim 6 .

10. A liquid jet head comprising: the liquid jet head according to claim 1 ; Liquid jet recording device.

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