Liquid ejecting head and liquid ejecting recording apparatus

Abstract

The present disclosure prevents breakage of a liquid ejecting head caused by static electricity. A liquid ejecting head according to an aspect of the present disclosure includes: a base member; an ejection module which is mounted on the base member and ejects a liquid; a nozzle plate in which nozzle holes for ejecting the liquid are formed; a metal nozzle shield for protecting the nozzle plate; and an electrically conductive conduction part that is electrically conductive to the ejection module and the nozzle shield via the base member, and that connects the nozzle shield and a frame ground member.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a liquid jet head and a liquid jet recording apparatus. Background Art

[0002] Patent Document 1 discloses a liquid ejecting head comprising a flow path unit that forms a nozzle for ejecting liquid and a pressure generating chamber that communicates with the nozzle and generates pressure changes through a driving mechanism, causing the flow path unit to abut against a head housing. The flow path unit is protected by a head cover, for example, formed of a conductive metal. Prior Art Literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-74676 Summary of the Invention Problems to be solved by the invention

[0004] However, if the cover part protecting the nozzle plate is made of conductive metal and is not electrically connected to other parts, static electricity from the medium is likely to pass through the nozzle hole and strike the electrodes, etc., increasing the possibility of damage to the liquid ejecting head due to static electricity.

[0005] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to prevent damage to a liquid ejecting head caused by static electricity. Solutions to Problems

[0006] (1) A liquid ejection head according to one embodiment of the present disclosure comprises: a base member; an ejection module mounted on the base member and ejecting liquid; a nozzle plate having a nozzle hole for ejecting the liquid; a metal nozzle guard for protecting the nozzle plate; and a conductive conducting portion connected to the ejection module and the nozzle guard via the base member and used to connect the nozzle guard to a frame grounding member.

[0007] The liquid jet head of this embodiment can short-circuit the nozzle guard to the same potential as the frame ground (hereinafter referred to as "FG"), preventing static electricity from the medium from passing through the nozzle holes and striking electrodes, etc. This prevents damage to the inkjet head caused by static electricity.

[0008] (2) In the liquid ejecting head of solution (1), the conductive portion may be fixed outside the ejecting module.

[0009] According to this configuration, the fixing operation can be performed outside the injection module, thereby contributing to improved operability.

[0010] (3) In the liquid ejecting head of solution (2), the conductive portion may be fixed to a side surface in the longitudinal direction of the ejecting module.

[0011] According to this configuration, there is no influence on the thickness direction of the liquid ejecting head, and thus even when a plurality of liquid ejecting heads are provided in the thickness direction, the density can be increased.

[0012] (4) In any one of the liquid ejecting heads described in (1) to (3), the conductive portion may be fixed with screws.

[0013] According to this configuration, since the connection is fixed by screws, electrical conduction can be achieved more reliably.

[0014] (5) In the liquid ejecting head according to any one of (1) to (4), the conductive portion may be fixed to the same member of the ejecting module as the ground portion of the drive substrate.

[0015] According to this configuration, by sharing the ground portion, the potential can be reliably maintained at the same level as the drive substrate without intervening other components, thereby achieving a noise countermeasure effect.

[0016] (6) In the liquid ejecting head according to any one of (1) to (5), an opening through which the conducting portion passes may be formed in the base member.

[0017] This structure allows the injection module and the nozzle guard to be electrically connected through the opening of the base member, thus contributing to shortening the conductive path. In addition, even if a portion of the base member is non-metallic, the nozzle guard can be kept at the same potential as FG.

[0018] (7) In the liquid ejecting head according to any one of (1) to (6), at least a corner portion of the nozzle guard may have a stretched portion subjected to a stretching process.

[0019] According to this configuration, it is possible to suppress the occurrence of gaps at least in the corners of the nozzle guard.

[0020] (8) In the liquid ejecting head of the solution (7), the side surface portion of the nozzle guard may have a bent portion to which a bending process has been performed.

[0021] According to this configuration, even a portion that would not be extended by stretching alone can be extended by bending, so that electrical conduction can be achieved at the side surface portion.

[0022] (9) In the liquid ejecting head of the solution (8), a cutout may be formed at the boundary between the stretched portion and the bent portion of the nozzle guard.

[0023] According to this structure, the liquid that has entered the stretched portion can be discharged through the cutout of the nozzle guard. Moreover, even when the nozzle guard is made by a combination of stretching and bending, the cutout makes it easy to process.

[0024] (10) In the liquid ejecting head of solution (8) or (9), the conducting portion may be formed integrally with the side surface portion of the nozzle guard using the same component.

[0025] According to this configuration, dedicated conductive components are unnecessary, thus contributing to a reduction in the number of components.

[0026] (11) In the liquid ejecting head of the solution (10), the conductive portion may be fixed to the outside of the ejecting module by using a portion extending straightly upward from the nozzle guard rather than the base member.

[0027] This configuration saves space in the direction of the installation surface compared to a case where a widened portion extending in the direction of the installation surface of the liquid ejecting head is provided for fixing. Furthermore, a resin housing can be provided between the nozzle guard and the base member, thereby contributing to cost reduction compared to a case where a metal housing is provided.

[0028] (12) A liquid jet recording apparatus according to one aspect of the present disclosure includes the liquid jet head according to any one of (1) to (11).

[0029] According to the liquid jet recording apparatus according to this aspect, it is possible to obtain a liquid jet recording apparatus capable of preventing damage to the liquid jet head due to static electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the inkjet printer according to the first embodiment. Figure 2 It is a perspective view of the inkjet head according to the first embodiment. Figure 3 This is a perspective view showing a portion of the inkjet head according to the first embodiment in an exploded manner. Figure 4 This is a perspective view showing a portion (FPC unit) of the inkjet head according to the first embodiment, with the portion (FPC unit) exposed. Figure 5 It is from Figure 2 The diagram observed from the viewing direction V. Figure 6 It is a perspective view of the nozzle guard according to the first embodiment. Figure 7 yes Figure 2 An enlarged view of the framed portion VII. Figure 8It is an explanatory diagram of a conductive path passing through the base member according to the first embodiment. Figure 9 It is an explanatory diagram of the conductive path using the sandwiching between the cover and the support according to the first embodiment. Figure 10 This is a perspective view showing a portion of an inkjet head according to a second embodiment in an exploded manner. Figure 11 It is a perspective view showing a mounting portion of a support column and a plate member according to a second embodiment. Figure 12 It is an explanatory diagram of a conductive path utilizing interposition between a plate member and a support column according to a second embodiment. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present disclosure with reference to the accompanying drawings. In the embodiments or variations described below, corresponding components may be assigned the same reference numerals and their descriptions omitted. In the following description, expressions such as "parallel," "orthogonal," "centered," or "coaxial" indicating relative or absolute configurations not only represent strictly such configurations but also indicate relative displacements within tolerances or at angles or distances that achieve the same functionality.

[0032] In the following embodiments, an inkjet printer (hereinafter simply referred to as a "printer") that records on a recording medium using ink (liquid) is described as an example of a liquid jet recording device equipped with the liquid jet head of the present disclosure. The scale of each component in the drawings used in the following description is appropriately altered to make each component appear recognizable.

[0033] <First embodiment> <Printer> Figure 1 This is a schematic diagram of the structure of the printer 1. like Figure 1 As shown, 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 ejecting heads); and a scanning mechanism 6 .

[0034] In the following description, the orthogonal coordinate system of X, Y, and Z is used as needed. The X direction corresponds to the conveyance 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 vertical direction orthogonal to the X and Y directions. In the following description, the directions indicated by arrows in the figures of the X, Y, and Z directions are the positive (+) direction, and the directions opposite to the arrows are the negative (-) direction. In this embodiment, the +Z direction corresponds to the upward direction of gravity, and the -Z direction corresponds to the downward direction of gravity.

[0035] The transport mechanisms 2 and 3 transport the recording medium P in the X direction. Specifically, the transport mechanism 2 includes a grid roller 11 extending in the Y direction, a pinch roller 12 extending parallel to the grid roller 11, and a drive mechanism (not shown) such as a motor that rotates the grid roller 11. Similarly, the transport mechanism 3 includes a grid roller 13 extending in the Y direction, a pinch roller 14 extending parallel to the grid roller 13, and a drive mechanism (not shown) that rotates the grid roller 13.

[0036] The ink supply mechanism 4 includes an ink tank 15 containing ink and an ink pipe 16 connecting the ink tank 15 and the inkjet heads 5A and 5B. In this embodiment, a plurality of ink tanks 15 are arranged in parallel along the X direction. Each ink tank 15 contains ink 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.

[0037] The scanning mechanism 6 reciprocates the inkjet heads 5A and 5B 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 by the pair of guide rails 21 and 22 , and a drive mechanism 24 that moves the carriage 23 in the Y direction.

[0038] 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 rotationally drives one pulley 26 .

[0039] The carriage 23 is connected to the endless belt 27. Multiple inkjet heads 5A and 5B are mounted on the carriage 23 in a parallel arrangement along the Y direction. Each inkjet head 5A and 5B is configured to eject two colors of ink. Therefore, in the printer 1 of this embodiment, each inkjet head 5A and 5B ejects two different colors of ink, thereby enabling the ejection of four colors of ink: yellow, magenta, cyan, and black.

[0040] <Inkjet Head> Figure 2 It is a perspective view of the inkjet head 5A. Figure 3 It is a perspective view showing a portion of the inkjet head 5A in an exploded manner. Figure 4 This is a perspective view showing a portion of the inkjet head 5A (FPC unit 100) exposed. Figure 5 It is from Figure 2 The diagram observed from the viewing direction V. Figure 6 4 is a perspective view of the nozzle guard 40. The inkjet heads 5A and 5B have the same configuration except for the color of the ink supplied. Therefore, in the following description, the inkjet head 5A will be described, and the description of the inkjet head 5B will be omitted.

[0041] The inkjet head 5A of the present embodiment is an electromechanical inkjet head that discharges ink from a head chip including an actuator plate formed of a piezoelectric element such as PZT (lead zirconate titanate).

[0042] In this inkjet head 5A, to eject ink, a voltage is applied between electrodes on the drive wall of the ejection channel formed on the actuator plate, causing the thickness of the drive wall to slip and deform. This causes the volume within the ejection channel to change, and the ink within the ejection channel is ejected through the nozzle orifice. Furthermore, the ink ejection method is not limited to the electromechanical conversion method listed above; alternative methods include electrification control, pressurized vibration, electrothermal conversion, and electrostatic attraction.

[0043] The charge control method applies an electric charge to the material using a charging electrode, and uses a deflection electrode to control the material's flight direction, causing it to be ejected from the nozzle. Alternatively, the pressure vibration method applies an ultra-high pressure to the material, causing it to be ejected toward the nozzle tip. Without a control voltage, the material travels straight and is ejected from the nozzle. However, applying a control voltage causes electrostatic repulsion between the materials, causing them to scatter and not be ejected from the nozzle.

[0044] The electrothermal conversion method uses a heater placed within the material storage space to rapidly vaporize the material, generating bubbles (foam). The pressure from the bubbles causes the material to be ejected from the space. The electrostatic attraction method applies a slight pressure to the material storage space, forming a meniscus of the material in a nozzle. Electrostatic attraction in this state draws the material out. Other techniques that utilize changes in fluid viscosity caused by an electric field or spark discharge are also applicable.

[0045] Refer to Figures 2 to 6 The base member 50 is equipped with injection modules 30A, 30B, and 30C (see Figure 3 )、Nozzle plate 35 (refer to Figure 5 ) and nozzle guard 40 (refer to Figure 6 ) etc. constitute the inkjet head 5A of this embodiment.

[0046] <Base components> The base member 50 is formed into a shape with the Z direction as the thickness direction and the X direction as the length direction. The base member 50 includes: a base body portion 51 for holding each injection module 30A, 30B, 30C; and a base member 51 for fixing the base member 50 to the carriage 23 (see Figure 1 ) of the carriage fixing portion 52. In this embodiment, the base member 50 is formed separately from the frame 36. For example, the base member 50 may be formed of a metal material such as stainless steel.

[0047] The base body 51 includes a module accommodating portion 53 that is open in the Z direction and capable of accommodating each of the injection modules 30A, 30B, and 30C. Each of the injection modules 30A, 30B, and 30C can be inserted into the module accommodating portion 53. The -Z-direction ends of each of the injection modules 30A, 30B, and 30C can be inserted into the module accommodating portion 53 from the +Z direction. In this inserted state, each of the injection modules 30A, 30B, and 30C is held in the base body 51, standing upright from the base member 50 in the +Z direction.

[0048] The carriage fixing portion 52 extends from the +Z direction end of the base body portion 51 along the XY plane. The carriage fixing portion 52 extends further outward in the X direction than in the Y direction. A portion for attaching the base member 50 to the carriage 23 (see FIG. 2 ) is formed in the carriage fixing portion 52. Figure 1 ) mounting holes, etc.

[0049] <Injection module> The ejection modules 30A, 30B, and 30C are formed in a plate shape with the Y direction as the thickness direction and the X direction as the length direction. The ejection modules 30A, 30B, and 30C are configured to be able to eject ink from the ink tank 15 (see Figure 1 ) is ejected toward the recording medium P. The ejection modules 30A, 30B, and 30C are mounted on the base member 50 in a state of being aligned in the Y direction.

[0050] In the inkjet head 5A of this embodiment, each jetting module 30A, 30B, and 30C is integrated into a single port, thereby ejecting a single color of ink. Furthermore, the number of jetting modules 30A, 30B, and 30C mounted on the base member 50, as well as the color and type of ink ejected from the jetting modules 30A, 30B, and 30C, can be appropriately changed. Each jetting module 30A, 30B, and 30C, having the same configuration, is mounted on the base member 50 so that the jetting modules 30A, 30B, and 30C are aligned in the Y direction.

[0051] In this embodiment, each ejection module 30A, 30B, and 30C is a so-called edge ejection type ejection module that ejects ink from the end portion of the ejection channel in the extension direction (Z direction) (for example, the -Z direction end surface of the head chip).

[0052] An FPC unit 100 is supported on the surface facing the -Y direction of each injection module 30A, 30B, and 30C. 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 (FPC), each having a wiring pattern formed on a base film. Alternatively, the portion (mounting portion) of the drive substrate 101 where the driver of the head chip is mounted may be a rigid substrate or the like.

[0053] The base member 50 is provided with support columns 60 for supporting mounted components mounted on the base member 50. The support columns 60 stand upright from the base member 50 in the +Z direction and surround the injection modules 30A, 30B, and 30C.

[0054] <Nozzle Plate> In this embodiment, the nozzle plate 35 is formed of a resin material such as polyimide (see Figure 5 The nozzle plate 35 is fixed to the -Z direction end surface of the base body portion 51 or the -Z direction end surfaces of the injection modules 30A, 30B, and 30C (portions exposed from the module accommodating portion 53) via an adhesive or the like.

[0055] Nozzle holes (not shown) penetrating the nozzle plate 35 in the Z direction are formed in the nozzle plate 35. The nozzle holes are formed at positions facing the ejection channels of the head chip in the Z direction.

[0056] Furthermore, the nozzle plate 35 is not limited to resin materials. For example, the nozzle plate 35 may be formed of silicon, a metal material (such as stainless steel), or a laminated structure of a resin and metal material. Furthermore, a single nozzle plate 35 may cover all of the injection modules 30A, 30B, and 30C, or a plurality of nozzle plates 35 may cover each injection module 30A, 30B, and 30C.

[0057] Nozzle guard The nozzle guard 40 is a metal component that protects the nozzle plate 35. For example, the nozzle guard 40 is formed by applying a combination of drawing and bending to a sheet of stainless steel or the like. The nozzle guard 40 covers the base body 51 from the -Z direction, sandwiching the nozzle plate 35 between the nozzle guard 40 and the base body 51. Furthermore, a frame 36 (an example of a resin housing) made of a synthetic resin such as plastic may be provided between the nozzle guard 40 and the base member 50.

[0058] Exposure holes 41h are formed in the nozzle guard 40 at positions facing the -Z end surfaces of the jetting modules 30A, 30B, and 30C in the Z direction, exposing the nozzle plate 35 to the outside. The exposure holes 41h are slit-shaped, extending through the nozzle guard 40 in the Z direction and extending in the X direction. Three rows of exposure holes 41h are formed in the Y direction, spaced apart, corresponding to the jetting modules 30A, 30B, and 30C. The nozzle holes communicate with the outside of the inkjet head 5A through the exposure holes 41h.

[0059] <Conductive part> Figure 7 yes Figure 2 An enlarged view of the framed portion VII. Figure 8 1 is an explanatory diagram of the conductive path through the base member 50. Figure 8 Illustration of the frame 36 provided between the nozzle guard 40 and the base member 50 is omitted. Refer to Figure 7 and Figure 8 The inkjet head 5A includes: a base component 50; injection modules 30A, 30B, and 30C, which are mounted on the base component 50 and eject ink; a nozzle plate 35, which is formed with nozzle holes for ejecting ink; a metal nozzle guard 40, which protects the nozzle plate 35; and a conductive conductive portion 43, which is connected to the injection modules 30A, 30B, and 30C and the nozzle guard 40 via the base component 50, and is used to connect the nozzle guard 40 to the FG.

[0060] The conductive portion 43 is fixed outside the injection modules 30A, 30B, and 30C. Specifically, the conductive portion is fixed outside in the X direction relative to the outer end portions in the X direction of the injection modules 30A, 30B, and 30C.

[0061] The conductive portion 43 is fixed to the side surfaces of the injection modules 30A, 30B, and 30C in the longitudinal direction (X direction). The conductive portion 43 is not fixed to the side surfaces of the injection modules 30A, 30B, and 30C in the thickness direction (Y direction).

[0062] Refer to Figure 6 The nozzle guard 40 has stretched portions 45 at at least the corners thereof. The nozzle guard 40 includes a guard body 41 formed into a plate-like shape with its thickness in the Z direction and its length in the X direction, and rising portions 42 rising from the outer periphery of the guard body 41 in the +Z direction. When the nozzle guard 40 is viewed from the Z direction, the stretched portions 45 are located at the four corners of the rectangular shape with its length in the X direction.

[0063] The side surface of the nozzle guard 40 has a bent portion 46. The bent portion 46 is provided between the portion (flat surface) of the rising portion 42 excluding the corners and the guard body 41. The rising portion 42 rises in the +Z direction from the outer edges of the guard body 41 in the X and Y directions via the bent portion 46.

[0064] A notch 47 is formed at the junction of the stretched portion 45 and the bent portion 46 of the nozzle guard 40. The notch 47 is sized to allow liquid that has entered the stretched portion 45 to be discharged. The notches 47 are formed at four locations corresponding to the stretched portions 45 provided at the four corners. Each notch 47 is formed further inward in the Y direction than the stretched portion 45. Each notch 47 is formed to be longer in the Z direction than in the X direction and to open in the Y direction.

[0065] The conducting portion 43 is integrally formed with the side surface of the nozzle guard 40 using the same member. The side surface of the nozzle guard 40, including the conducting portion 43, is formed into an L-shape when viewed from the X direction. A threaded hole 43h is formed on the +Z direction end side of the conducting portion 43, penetrating the conducting portion 43 in the X direction.

[0066] At both ends of the nozzle guard 40 in the X direction, the portions of the guide portion 43 where the threaded holes 43h are formed are formed so as to be offset from one another in the Y direction. The portion of the guide portion 43 where the threaded holes 43h are formed on the +X end side is formed further toward the +Y direction than the Y direction center of the nozzle guard 40. On the other hand, the portion of the guide portion 43 where the threaded holes 43h are formed on the -X end side is formed further toward the -Y direction than the Y direction center of the nozzle guard 40.

[0067] Refer to Figure 7 The conductive portion 43 is fixed to the outside of the injection modules 30A, 30B, and 30C by extending straight upward from the nozzle guard 40 beyond the base member 50. The base member 50 has an opening 52h formed therein for the conductive portion 43 to pass through. The opening 52h penetrates the carriage fixing portion 52 of the base member 50 in the Z direction. The opening 52h is formed in a slit shape extending along the outer periphery of the conductive portion 43 and in the Y direction when viewed from the Z direction. The conductive portion 43 extends straight toward the +Z direction through the opening 52h formed in the carriage fixing portion 52.

[0068] The conducting portion 43 is fixed with screws 67. For example, the screws 67 are screwed from the X-outside through the threaded holes 43h of the conducting portion 43 into the female threads 65 formed at the -Z-direction end of the support 60. Thus, the conducting portion 43 can be fixed to the support 60 with the screws 67.

[0069] The conductive portion 43 is fixed to the same component as the ground portion of the drive substrate 101 of the injection modules 30A, 30B, and 30C. The ground portion of the drive substrate 101 corresponds to, for example, a portion of the drive substrate 101 that serves as a reference ground (a portion that functions as a reference plane for potential). A patterned wiring serving as a reference ground may also be provided on the drive substrate 101. In this case, the conductive portion 43 may also be connected to the patterned wiring formed on the drive substrate 101.

[0070] Reference Figure 8 In this embodiment, a conductive conducting portion 43 is provided, which is connected to the injection modules 30A, 30B, 30C and the nozzle guard 40 via the base component 50 and is used to connect the nozzle guard 40 to the FG, thereby forming a conductive path through the base component 50.

[0071] The path includes the path of arrow V1 along the conducting portion 43 of the nozzle guard 40, the path of arrow V2 along the ground portion of the drive substrate 101, the path of arrow V3 along the carriage fixing portion 52 of the base member 50, and the path through the carriage 23 (see FIG. Figure 1 ) to form the conductive path.

[0072] <Connecting parts> Figure 9 It is an explanatory diagram of a conductive path using the interposition between the cover 80 and the support 60 . Refer to Figure 3 、 Figure 4 and Figure 9 The inkjet head 5A includes: ejection modules 30A, 30B, and 30C for ejecting ink; and a conductive connection member 70 for connecting the ejection modules 30A, 30B, and 30C to the FG. At least a portion of the connection member 70 is provided outside the ejection modules 30A, 30B, and 30C.

[0073] The connection member 70 is fixed to the outside of the injection modules 30A, 30B, and 30C. Specifically, the connection member 70 is fixed to the outside in the X direction relative to the outer end portions in the X direction of the injection modules 30A, 30B, and 30C.

[0074] The connection member 70 is fixed to the side surface of the injection modules 30A, 30B, and 30C in the longitudinal direction (X direction). In this embodiment, the connection member 70 is formed of a leaf spring. For example, the connection member 70 is formed by bending a plate material such as stainless steel.

[0075] The connecting member 70 is formed in such a way that an L-shaped portion when viewed from the Y direction and an L-shaped portion when viewed from the X direction are integrated. The connecting member 70 is secured to the +Z-direction corner of the +X-direction end of the drive substrate 101 when viewed from the -Y direction using screws or the like. Three connecting members 70 are provided corresponding to each of the injection modules 30A, 30B, and 30C. Connecting members 70 having the same structure are arranged side by side in the Y direction.

[0076] Specifically, each connecting member 70 includes a first extension portion 71 extending from a portion fixed to the drive substrate 101 toward the +X outer edge of the drive substrate 101, and then extending toward the -Z direction; a second extension portion 72 extending from the -Z end of the first extension portion 71 toward the +Y direction to a position facing the +X end surface of the injection modules 30A, 30B, and 30C; and a third extension portion 73 extending from the +Y end of the second extension portion 72 toward the +X and +Z directions, and then extending straight toward the +Z direction. Each connecting member 70 is configured to apply a force at least in the X direction between the injection modules 30A, 30B, and 30C and the pressing portion 83.

[0077] A support 60 is disposed outside the injection modules 30A, 30B, and 30C. A portion of the connecting member 70 extends outside the support 60. The support 60 has an opening 61h through which the connecting member 70 passes. A female thread 66 is formed on the -Z direction side of the opening 61h of the support body 61.

[0078] Specifically, the support 60 includes a support body 61 formed in a plate-like shape with the X direction as its thickness direction and the Z direction as its length direction; and an extension (flared portion) 62 extending inward in the X direction from both outer edges of the support body 61 in the Y direction. An opening 61h is formed in the support body 61 to allow a portion of the connecting component 70 (the portion on the outer end side of the third extension 73 in the X direction) to be extended toward the +X direction side relative to the support body 61. The opening 61h is formed in a slit-like shape that penetrates the support body 61 in the X direction and extends in the Y direction. A portion of each connecting component 70 extends through the opening 61h to the +X direction side relative to the support body 61. A pair of female threads 66 are formed at intervals in the Y direction.

[0079] The inkjet head 5A includes a pressing portion 83 that sandwiches and presses the portion of the connecting member 70 extending outside the support 60 between the pressing portion 83 and the support 60. The portion of each connecting member 70 extending outside the support 60 is sandwiched between the pressing portion 83 and the support 60.

[0080] The inkjet head 5A includes a cover 80 that covers the ejection modules 30A, 30B, and 30C and the support 60 . The pressing portion 83 constitutes a part of the cover 80 .

[0081] The cover 80 is formed to be open in the -Z direction and covers the upper portions of the injection modules 30A, 30B, 30C, etc. from the +Z direction. Specifically, the cover 80 includes a cover body 81 formed in a box shape with its longitudinal direction in the X direction and open in the -Z direction; and extensions 82 extending from both outer ends of the cover body 81 in the X direction in the -Z direction.

[0082] The cap body 81 is formed with a port for ink inflow and a through-hole for exposing connectors and other components in the +Z direction. The pressing portion 83 forms a portion of the extension 82. A threaded hole 82h is formed at the -Z end of each extension 82, extending through the extension 82 in the X direction. A pair of threaded holes 82h are formed at intervals in the Y direction. The threaded holes 82h are formed at positions corresponding to the female threads 66 (the positions that overlap with the female threads 66 when the cap 80 is assembled, as viewed from the X direction).

[0083] The connecting components 70 are secured with screws 68. For example, with a portion of each connecting component 70 extending outside the support column 60, screws 68 are threaded into the female threads 66 of the support column body 61 through the threaded holes 82h of the extension portion 82 of the cover 80 from the outside in the X direction. This allows the extension portion 82 to be secured to the support column 60 with screws 68, while the portion of each connecting component 70 extending outside the support column 60 is sandwiched between the support column 60 and the pressing portion 83, thereby pressing the portion. In this embodiment, the portion of each connecting component 70 extending outside the support column 60 can be pressed together by the pressing portion 83 of the cover 80 between the cover 80 and the support column 60.

[0084] Reference Figure 9 In this embodiment, there is a conductive connecting component 70 for connecting the injection modules 30A, 30B, and 30C to the FG, and a pressing portion 83 is provided for clamping the portion of the connecting component 70 extending to the outside of the pillar 60 between the pillar 60 and pressing it. The pressing portion 83 constitutes a part of the cover 80, thereby forming a conductive path clamped by the cover 80 and the pillar 60.

[0085] <Printer Operation> A method of recording information on the recording medium P using the above-described printer 1 will be described. like Figure 1As shown, when the printer 1 is operated, the grid rollers 11 and 13 of the transport mechanisms 2 and 3 rotate, transporting the recording medium P in the +X direction between these grid rollers 11 and 13 and the pinch rollers 12 and 14. Simultaneously, the motor 28 is driven to rotate the pulley 26, causing the endless belt 27 to travel. This causes the carriage 23 to reciprocate in the Y direction while being guided by the guide rails 21 and 22. During this process, a driving voltage is applied to the drive electrodes of the head chips of each inkjet head 5A and 5B. This causes the drive wall to deform due to thickness slip, generating a pressure wave in the ink filling the ejection channel. This pressure wave increases the internal pressure of the ejection channel, causing the ink to be ejected through the nozzle orifice. The ink then lands on the recording medium P, recording various information on the recording medium P.

[0086] Effects The inkjet heads 5A and 5B of this embodiment include: a base component 50; injection modules 30A, 30B, and 30C, which are mounted on the base component 50 and eject ink; a nozzle plate 35, which is formed with nozzle holes for ejecting ink; a metal nozzle guard 40, which protects the nozzle plate 35; and a conductive conductive portion 43, which is connected to the injection modules 30A, 30B, and 30C and the nozzle guard 40 via the base component 50, and is used to connect the nozzle guard 40 to the FG.

[0087] This configuration can short-circuit the nozzle guard 40 to the same potential as FG, preventing static electricity from the medium from passing through the nozzle holes and hitting electrodes, etc. Therefore, damage to the inkjet heads 5A and 5B due to static electricity can be prevented.

[0088] The conductive portion 43 of this embodiment is fixed to the outside of the injection modules 30A, 30B, and 30C. According to this configuration, the fixing operation can be performed outside the injection modules 30A, 30B, and 30C, thereby contributing to improved operability.

[0089] The conductive portion 43 of this embodiment is fixed to the side surfaces in the longitudinal direction of the injection modules 30A, 30B, and 30C. According to this structure, since there is no influence on the thickness direction of the inkjet heads 5A and 5B, even when a plurality of inkjet heads 5A and 5B are provided in the thickness direction, high density can be achieved.

[0090] The conductive portion 43 of this embodiment is fixed with screws 67 . According to this configuration, since the connection is fixed by screws, electrical conduction can be achieved more reliably.

[0091] The conductive portion 43 of the present embodiment is fixed to the same member as the ground portion of the drive substrate 101 of the injection modules 30A, 30B, and 30C. According to this configuration, by sharing the ground portion, it is possible to reliably achieve the same potential as the drive substrate 101 without intervening other components. This also provides an effect of noise suppression.

[0092] The base member 50 of the present embodiment is formed with an opening 52 h through which the conducting portion 43 passes. This configuration allows electrical communication between the injection modules 30A, 30B, and 30C and the nozzle guard 40 through the opening 52h of the base member 50, thereby shortening the electrical path. Furthermore, even when a portion of the base member 50 is non-metallic, the nozzle guard 40 can be maintained at the same potential as FG.

[0093] The nozzle guard 40 of the present embodiment has a drawn portion 45 at least at a corner thereof. According to this configuration, it is possible to suppress the occurrence of gaps at least in the corners of the nozzle guard 40 .

[0094] The nozzle guard 40 of the present embodiment has a bent portion 46 on the side surface thereof. According to this configuration, even a portion that would not be extended by stretching alone can be extended by bending, so that electrical conduction can be achieved at the side surface portion.

[0095] In the nozzle guard 40 of the present embodiment, a notch 47 is formed at the boundary between the drawn portion 45 and the bent portion 46 . According to this structure, the liquid that has entered the drawn portion 45 can be discharged through the cutout 47 of the nozzle guard 40. Furthermore, even when the nozzle guard 40 is manufactured by a combination of drawing and bending, the presence of the cutout 47 facilitates processing.

[0096] The conduction portion 43 of the present embodiment is formed integrally with the side surface portion of the nozzle guard 40 using the same member. According to this configuration, dedicated conductive components are unnecessary, thus contributing to a reduction in the number of components.

[0097] The conduction portion 43 of the present embodiment is fixed to the outside of the injection modules 30A, 30B, and 30C by a portion extending straightly upward from the nozzle guard 40 beyond the base member 50 . This configuration saves space in the direction of the installation surface compared to a case where a widened portion extending in the direction of the installation surface of the inkjet heads 5A and 5B is provided for fixing. Furthermore, a resin housing can be provided between the nozzle guard 40 and the base member 50, thereby contributing to cost reduction compared to a case where a metal housing is provided.

[0098] The printer 1 of this embodiment includes the inkjet heads 5A and 5B described above. According to this configuration, it is possible to obtain the printer 1 that can prevent damage to the inkjet heads 5A and 5B caused by static electricity.

[0099] However, when the cover part protecting the nozzle plate is a conductive metal part, it is preferably at the same potential as FG for the following reason unless the cover part is electrically connected to other parts. (1) Short-circuit the nozzle guard and connect it to the ground so that static electricity from the medium does not pass through the nozzle hole and hit the electrode (such as the common electrode). (2) The return current path (the path from the nozzle guard to the drive substrate) of the noise generated during driving is minimized so that the noise does not have an adverse effect. (3) When connected via ink, the nozzle guard is prevented from being electrically floated in order to prevent metal corrosion caused by a potential difference between the nozzle guard and an electrode (eg, a common electrode).

[0100] In this embodiment, a conductive conductive portion 43 is provided. This portion electrically connects the jetting modules 30A, 30B, and 30C and the nozzle guard 40 via the base member 50, and serves to connect the nozzle guard 40 to the FG. The conductive portion 43 is secured to the outside of the jetting modules 30A, 30B, and 30C by extending straight upward from the base member 50. This arrangement (A) prevents damage to the inkjet heads 5A and 5B caused by static electricity, (B) reduces the effects of noise during printing, and (C) prevents metal corrosion of the nozzle guard 40. Furthermore, (D) space can be saved in the installation direction, enabling a reduction in the size of the carriage 23, contributing to device miniaturization and transport system cost reduction. Furthermore, (E) the strength of the inkjet heads 5A and 5B can be maintained while achieving the aforementioned benefits (A) through (D).

[0101] The inkjet heads 5A and 5B of this embodiment include ejection modules 30A, 30B, and 30C for ejecting ink, and a conductive connection member 70 for connecting the ejection modules 30A, 30B, and 30C to the FG. At least a portion of the connection member 70 is provided outside the ejection modules 30A, 30B, and 30C.

[0102] For example, if the entire connecting member for connecting the injection module to the FG is located inside the injection module, visual confirmation of the FG connection during assembly becomes difficult. In contrast, with this configuration, at least a portion of the connecting member 70 is located outside the injection modules 30A, 30B, and 30C, making visual confirmation of the FG connection easier during assembly. Furthermore, continuity verification is easily performed even after assembly.

[0103] The connection member 70 of this embodiment is fixed to the outside of the injection modules 30A, 30B, and 30C. According to this configuration, the fixing operation can be performed outside the injection modules 30A, 30B, and 30C, thereby contributing to improved operability.

[0104] The connection member 70 of this embodiment is fixed to the side surfaces in the longitudinal direction of the injection modules 30A, 30B, and 30C. According to this structure, there is no influence on the thickness direction of the injection modules 30A, 30B, and 30C, so even when a plurality of injection modules 30A, 30B, and 30C are provided in the thickness direction, high density can be achieved.

[0105] The connection member 70 of this embodiment is fixed by screws 68 . According to this configuration, since the connection is fixed by screws, electrical conduction can be achieved more reliably.

[0106] The inkjet heads 5A and 5B of this embodiment include support columns 60 arranged outside the ejection modules 30A, 30B, and 30C. A portion of the connecting member 70 extends outside the support columns 60 . According to this configuration, a portion of the connection member 70 extends outside the support column 60 , making it easier to visually check the FG connection during assembly.

[0107] The inkjet heads 5A and 5B of this embodiment include a pressing portion 83 that sandwiches a portion of the connecting member 70 extending outside the support 60 between the inkjet heads 5A and 5B and presses the portion. According to this structure, since fixation is achieved by being sandwiched between the support 60 and the pressing portion 83 , it contributes to improving the reliability of the electrical connection.

[0108] The support column 60 of the present embodiment is formed with an opening 61 h through which the connection member 70 passes. According to this configuration, a portion of the connection member 70 can be extended to the outside of the support column 60 through the opening 61 h of the support column 60 .

[0109] The inkjet heads 5A and 5B of this embodiment include a cover 80 that covers the ejection modules 30A, 30B, and 30C and the support 60. The pressing portion 83 constitutes a part of the cover 80. According to this configuration, since fixation is achieved by being sandwiched between a portion of the cover 80 and the support 60 , no dedicated fixing parts are required, thus contributing to a reduction in the number of parts.

[0110] The printer 1 of this embodiment includes the inkjet heads 5A and 5B described above. This configuration provides a printer 1 that facilitates visual confirmation of the FG connection during assembly and facilitates continuity confirmation even after assembly.

[0111] However, in industrial inkjet printers, the ink atomization causes the media surface to become charged, potentially leading to electrostatic discharge in the inkjet head. Furthermore, driving the actuators used in the inkjet head sometimes generates a high level of driving noise. In this case, there's also the possibility that this driving noise could cause other inkjet heads within the inkjet printer to malfunction. To avoid this, there are configurations disclosed in Patent Document A (Japanese Patent Publication No. 2006-68981) and Patent Document B (Japanese Patent Publication No. 6504889). Patent Document A discloses a liquid jet head comprising: a head unit including a flow path unit forming a liquid flow path; a conductive nozzle plate joined to the head unit; a head housing to which the nozzle plate and the head unit are fixed; and a conductive head cover mounted to the head housing so as to surround the nozzle plate and the head unit from the outside. The head cover comprises a frame portion having an opening formed therein to expose the nozzle plate; and a contact protrusion projecting inwardly from the inner periphery of the frame portion. The head cover is mounted to the head housing with the contact protrusion abutting against the outer periphery of the nozzle plate. Patent Document B discloses a structure comprising the following components: a main body; a discharge portion capable of discharging liquid supplied through a liquid flow path; an electrical wiring board having a contact portion for receiving external signals; a flow path forming member forming the liquid flow path; and a conductive leaf spring electrically connected to the contact portion. In Patent Document B, the contact pressure required for electrical connection between the leaf spring and the contact portion is maintained through elastic deformation of the leaf spring. However, in the case of the structure of patent document A, the abutment protrusion is provided on the inner side of the head cover, so it is difficult to visually confirm whether the abutment protrusion is abutting against the nozzle plate when observing from the outside of the head cover. In the case of the structure of patent document B, it is difficult to visually confirm whether the connection between the leaf spring and the contact portion is completed when observing from the outside of the main body. In addition, if the connecting component for connecting the main body to the frame grounding piece is provided as a whole on the inner side of the main body, it becomes difficult to visually confirm the connection of the frame grounding piece during assembly. Furthermore, if the electrical connection is to be ensured only by the elastic restoring force of the leaf spring, there is a concern that the connection may become unstable due to vibration during transportation or vibration of the device.

[0112] To address these issues, the present embodiment includes: a conductive connection member 70 for connecting the injection modules 30A, 30B, and 30C to the FG; a support 60 disposed outside the injection modules 30A, 30B, and 30C; and a cover 80 covering the injection modules 30A, 30B, and 30C and the support 60. A portion of the connection member 70 extends outside the support 60, and the cover 80 includes a pressing portion 83 that sandwiches and presses the portion of the connection member 70 extending outside the support 60. This arrangement facilitates visual confirmation of the FG connection during assembly, and helps improve electrical connection reliability by securing the connection member 70 between the support 60 and the support 60. Furthermore, this sandwiching fixation enhances resistance to external factors such as device vibration. Furthermore, (D) when three or more injection modules 30A, 30B, and 30C are mounted, the FG connection of the injection module (for example, the injection module 30B) disposed on the center side among them can be easily achieved.

[0113] <Deformation example> In addition, the technical scope of the present invention is not limited to the above-mentioned embodiment, and various changes can be added without departing from the scope of the present invention. In the above embodiment, the conductive portion is fixed outside the injection module, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed inside the injection module.

[0114] In the above embodiment, the conductive portion is fixed to the side surface in the longitudinal direction of the injection module, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed to the side surface in the thickness direction of the injection module.

[0115] In the above embodiment, the conductive portion is fixed with screws, but the present invention is not limited to this structure. 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.

[0116] In the above embodiment, the conductive portion is fixed to the same component of the injection module as the ground portion of the driver substrate, but the present invention is not limited to this configuration. For example, the conductive portion may be fixed to a component of the injection module that is different from the ground portion of the driver substrate (via another component). The fixing method of the conductive portion can be changed according to design specifications.

[0117] While the above embodiment describes a configuration in which an opening is formed in the base member through which the conductive portion passes, the present invention is not limited to this configuration. For example, the base member may not have an opening, and the conductive portion may extend in a circuitous manner through the base member to provide electrical connection between the injection module and the nozzle guard. The formation of the opening in the base member and / or the extension of the conductive portion may be modified according to design specifications.

[0118] In the above embodiment, at least the corners of the nozzle guard have a stretched portion, but the present invention is not limited to this configuration. For example, the corners of the nozzle guard may have a bent portion.

[0119] While the above embodiment describes a configuration in which the side surface of the nozzle guard includes a bent portion, the nozzle guard is not limited to this configuration. For example, the side surface of the nozzle guard may also include a stretched portion. The design of the stretched portion and / or the bent portion can be modified according to design specifications.

[0120] While the above embodiment describes a configuration in which a notch is formed at the interface between the stretched and bent portions of the nozzle guard, the present invention is not limited to this configuration. For example, a buried portion may be provided at the interface between the stretched and bent portions of the nozzle guard to fill the gap at the interface. The method of forming the notch can be modified according to design specifications.

[0121] While the above embodiment describes a configuration in which the conductive portion and the side surface of the nozzle guard are integrally formed from the same component, the present invention is not limited to this configuration. For example, the conductive portion may be formed from a separate component from the side surface of the nozzle guard and integrally connected to the side surface of the nozzle guard. For example, the conductive portion may be integrally formed from the same component as the side surface of the support. The formation method of the conductive portion can be modified according to design specifications.

[0122] In the above embodiment, the conductive portion is fixed to the outside of the ejection module by a portion extending straight upward from the nozzle guard relative to the base member, but the present invention is not limited to this configuration. For example, a widened portion extending in the direction of the installation surface of the inkjet head may be provided for fixing.

[0123] In the above embodiment, the connection member is fixed to the outside of the injection module, but the present invention is not limited to this structure. For example, the connection member may be fixed to the inside of the injection module.

[0124] In the above embodiment, the connection member is fixed to the side surface in the longitudinal direction of the injection module, but the present invention is not limited to this structure. For example, the connection member may be fixed to the side surface in the thickness direction of the injection module.

[0125] In the above embodiment, the connection member is fixed with a screw, but the present invention is not limited to this structure. For example, the connection member may be fixed via a biasing member such as a spring, or may be fixed with a conductive adhesive or the like.

[0126] In the above embodiment, the inkjet head is described as having a structure in which a support is arranged outside the injection module, and a portion of the connecting component extends outside the support. However, the present invention is not limited to this structure. For example, the entire connecting component may be arranged inside the support. For example, no support may be provided outside the injection module. The arrangement of the support and / or the arrangement of the connecting component can be modified according to design specifications.

[0127] In the above embodiment, the inkjet head is described as having a pressing portion that sandwiches the portion of the connecting member extending outside the support and presses against the portion of the connecting member extending outside the support, but the present invention is not limited to this configuration. For example, the support may be fixed only to the portion of the connecting member extending outside the support. For example, a pressing portion may be provided to press against the portion of the connecting member extending outside the support. The method of fixing the connecting member and / or the arrangement of the pressing portion can be changed according to design specifications.

[0128] While the above embodiments describe a configuration in which an opening is formed in the pillar for the connection member to pass through, the present invention is not limited to this configuration. For example, the pillar may not have an opening, and a portion of the connection member may extend in a circuitous manner along the pillar, extending outward from the pillar. The formation of the pillar opening and / or the manner in which the connection member extends can be modified according to design specifications.

[0129] In the above embodiment, the inkjet head is described as having a cover covering the jetting module and the support, with the pressing portion forming part of the cover. However, the present invention is not limited to this configuration. For example, the pressing portion may be formed of a component separate from the cover. For example, the cover covering the jetting module and the support may not be provided. The arrangement of the cover and / or the configuration of the pressing portion may be modified according to design specifications.

[0130] <Second embodiment> Figure 10 This is a perspective view showing a portion of the inkjet head in an exploded manner. Figure 11 It is a perspective view showing the attachment portion of the support column 260 and the plate member 290 . Figure 12 It is an explanatory diagram of a conductive path using the space between the plate member 290 and the support 260 . In the first embodiment described above, an example of forming a conductive path by sandwiching between the cover 80 and the support 60 is described, but the present invention is not limited thereto. Figure 12As shown, a conductive path may be formed by being sandwiched between the plate member 290 and the support 260. In the second embodiment, the same reference numerals are given to the same configurations as those in the above-described embodiment, and detailed description thereof will be omitted.

[0131] Refer to Figures 10 to 12 The support 260 is disposed outside the injection module. A portion of the connecting member 70 extends outside the support 260. The support 260 is formed with an opening 261h through which each connecting member 70 passes.

[0132] The support 260 includes a support body 261 formed in a plate-like shape with its thickness in the X direction and its length in the Z direction, and an extension 262 extending inward in the X direction from both outer edges of the support body 261 in the Y direction. The support body 261 includes an opening 261h that allows a portion of each connecting member 70 (the portion on the outer X direction end of the third extension 73) to be extended toward the +X direction side of the support body 261. Each opening 261h is formed in a rectangular shape with rounded corners, extending through the support body 261 in the X direction. A portion of each connecting member 70 extends toward the +X direction side of the support body 261 through each opening 261h.

[0133] The inkjet head includes a pressing portion 293 that sandwiches and presses the portion of the connecting member 70 extending outside the support 260 between the pressing portion 293 and the support 260. The portion of each connecting member 70 extending outside the support 260 is sandwiched between the pressing portion 293 and the support 260.

[0134] The inkjet head includes a plate member 290 having a pressing portion 293. The pressing portion 293 constitutes a portion of the plate member 290. The pressing portion 293 is formed at a portion of the plate member 290 on the +Z direction end side.

[0135] Three plate members 290 are provided at intervals in the Y direction, corresponding to each connecting member 70. The plate members 290 are formed into an L-shape with the Z direction as the longitudinal direction. Specifically, the plate members 290 include a plate body 291 formed into a plate shape with the X direction as the thickness direction and the Z direction as the longitudinal direction; and a protrusion 292 that protrudes from the +Z direction end of the plate body 291 toward the -X direction.

[0136] The pressing portion 293 constitutes a portion of the plate body 291. The pressing portion 293 is formed on the +Z direction end side of the plate body 291. A screw hole 291h is formed on the -Z direction end side of the plate body 291, penetrating the plate body 291 in the X direction. The portion with the screw hole 291h is wider in the Y direction than the portion on the +Z direction side of the plate body 291.

[0137] The support body 261 has a through-hole 261i formed in a portion closer to the +Z direction than each opening 261h. This allows the protrusion 292 of the plate member 290 to protrude further toward the -X direction than the support body 261. Each through-hole 261i is formed in a rectangular shape with rounded corners when viewed in the X direction, extending through the support body 261 in the X direction. Each through-hole 261i is smaller than each opening 261h.

[0138] A female thread 266 is formed on the -Z direction side of each opening 261h of the support column 260. The female thread 266 is arranged on a Z direction straight line passing through the Y direction center of each opening 261h, and three female threads 266 are formed at intervals in the Y direction.

[0139] The connecting components 70 are fixed with screws 268. For example, with a portion of each connecting component 70 extending outside the support column 260, screws 268 are threaded into the female threads 266 of the support column 260 through the threaded holes 291h of each plate body 291 from the outside in the X direction. This allows the plate body 291 to be fixed to the support column 260 with screws 268, while the portion of each connecting component 70 extending outside the support column 260 is sandwiched between the support column 260 and the pressing portion 293 and pressed. In this embodiment, the portion of each connecting component 70 extending outside the support column 260 can be pressed by the pressing portion 293 of each plate member 290 between the plate member 290 and the support column 260.

[0140] Reference Figure 12 In this embodiment, there is a conductive connecting component 70 for connecting the injection module to the FG, and a pressing portion 293 is provided for clamping the portion of the connecting component 70 extending to the outside of the pillar 260 between the pillar 260 and pressing it. The pressing portion 293 constitutes a part of the plate component 290, thereby forming a conductive path clamped by the plate component 290 and the pillar 260.

[0141] The inkjet head of this embodiment includes a plate member 290 having a pressing portion 293 . According to this configuration, compared with the case where the connection member 70 is directly fixed with screws, electrical conduction can be achieved more reliably.

[0142] (Other variant examples) In addition, the technical scope of the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be added without departing from the spirit of the present disclosure. For example, in the above embodiment, an inkjet printer is described as an example of a liquid jet recording device, but the invention is not limited to a printer. For example, the liquid jet recording device may also be a fax machine or an on-demand printer. In the above embodiment, an example of a configuration in which the inkjet head moves relative to the recording medium during printing (so-called a shuttle) is used for description, but the present invention is not limited to this configuration. The configuration involved in the present disclosure can also be adopted in a configuration in which the recording medium moves relative to the inkjet head while the inkjet head is fixed (so-called a fixed-head machine). In the above embodiment, the recording medium (medium) is described as paper, but the present invention is not limited to this configuration. The recording medium is not limited to paper and may be a metal material, a resin material, or a food material. While the above embodiments describe a configuration in which a liquid jet head is mounted on a liquid jet recording apparatus, the present invention is not limited to this configuration. Specifically, the liquid ejected from the liquid jet head is not limited to a material that lands on a recording medium. For example, the liquid used in pharmaceutical preparations, food additives such as seasonings and spices added to food, and aromatics ejected into the air may also be used. In the above embodiment, the configuration in which the Z direction coincides with the direction of gravity has been described, but the present invention is not limited to this configuration. For example, the Z direction may also coincide with the horizontal direction.

[0143] In the above embodiment, a configuration in which three injection modules are mounted on a base member has been described, but the present invention is not limited to this configuration. The number of injection modules mounted on a base member may be one, two, or four or more.

[0144] In the above embodiment, an edge-shooting ejection module (head chip) is described, but the invention is not limited thereto. For example, the invention can also be applied to a so-called side-shooting type head chip that ejects ink from the center of the ejection channel in its extension direction. Furthermore, the present invention can also be applied to a so-called top-shooter type head chip in which the direction in which pressure is applied to ink and the direction in which ink is ejected are aligned.

[0145] In the above embodiment, the following configuration is described, but it is not limited to this configuration: the inkjet head includes: an injection module for ejecting liquid; and a conductive connecting component for connecting the injection module to the FG, at least a portion of the connecting component is provided on the outside of the injection module. For example, all of the connecting components may be provided on the inside of the injection module. For example, the conductive connecting component for connecting the injection module to the FG may not be provided. The arrangement of the connecting component can be changed according to the design specifications. That is, the liquid injection head involved in one embodiment of the present disclosure only needs to include the following components: a base component; an injection module, which is mounted on the aforementioned base component and ejects liquid; a nozzle plate, which is formed with nozzle holes for ejecting the aforementioned liquid; a metal nozzle guard, which protects the aforementioned nozzle plate; and a conductive conductive portion, which is conductive with the aforementioned injection module and the aforementioned nozzle guard via the aforementioned base component and is used to connect the aforementioned nozzle guard to the frame grounding member.

[0146] Furthermore, within the scope not departing from the spirit of the present invention, the components of the above-described embodiment may be appropriately replaced with known components, and the above-described modifications may be appropriately combined.

[0147] While the preferred embodiments and variations of the present disclosure have been described and illustrated above, it should be understood that these are merely illustrative and should not be considered limiting. Additions, omissions, substitutions, and other modifications may be made without departing from the scope of the present disclosure. Therefore, the present disclosure is limited by the claims and should not be construed as limited by the foregoing description. [Explanation of Reference Numerals]

[0148] 1…Printer (liquid jet recording device) 5A, 5B…Inkjet head (liquid ejection head) 30A, 30B, 30C…Injection modules 35…Nozzle plate 40…Nozzle guard 43…Conduction part 45…Stretching Processing Department 46…Bending department 47…Incision 50…base component 52h…Opening 67…screws 101…Driver board

Claims

1. A liquid ejecting head comprising: base member; a spray module mounted on the base member and spraying liquid; a nozzle plate formed with nozzle holes for spraying the liquid; a metal nozzle guard that protects the nozzle plate; and The conductive conducting portion is electrically connected to the injection module and the nozzle guard via the base component and is used to connect the nozzle guard to a frame grounding member.

2. The liquid ejecting head according to claim 1, wherein The conducting portion is fixed on the outer side of the injection module.

3. The liquid ejecting head according to claim 2, wherein The conductive portion is fixed to a side surface in a longitudinal direction of the injection module.

4. The liquid ejecting head according to any one of claims 1 to 3, wherein The conductive portion is fixed with screws.

5. The liquid ejecting head according to any one of claims 1 to 3, wherein The conductive portion is fixed to the same component of the ejection module as a ground portion of the drive substrate.

6. The liquid ejecting head according to any one of claims 1 to 3, wherein The base member has an opening formed therein through which the conductive portion passes.

7. The liquid ejecting head according to any one of claims 1 to 3, wherein The nozzle guard has a stretched portion having at least a corner portion thereof subjected to a stretching process.

8. The liquid ejecting head according to claim 7, wherein The side surface of the nozzle guard has a bent portion on which a bending process is performed.

9. The liquid ejecting head according to claim 8, wherein A cutout is formed at a boundary between the drawn portion and the bent portion of the nozzle guard.

10. The liquid ejecting head according to claim 8, wherein The conducting portion and the side surface portion of the nozzle guard are integrally formed with the same member.

11. The liquid ejecting head according to claim 10, wherein The conducting portion is fixed to the outside of the injection module by a portion extending straightly from the nozzle guard upward from the base member. 12 . A liquid jet recording apparatus comprising the liquid jet head according to claim 1 .

Images