Liquid dispensing head

Abstract

To provide a liquid dispensing head that allows for easy prevention of static electricity buildup. [Solution] The liquid discharge head of the embodiment is a liquid discharge head fixed to a liquid discharge recording device by a conductive fastening member, and comprises a nozzle plate, a conductive nozzle cover, a non-conductive head holding plate, and a conductive ground plate. The nozzle plate has a nozzle formed on it. The nozzle cover covers the nozzle plate. The head holding plate has a first hole into which the fastening member is inserted. One end of the ground plate is positioned around the first hole of the head holding plate and is in contact with the fastening member and the nozzle cover.

Description

Technical Field

[0001] Embodiments of the present invention relate to a liquid ejection head.

Background Art

[0002] A liquid ejection head that ejects a liquid such as ink onto a printing target such as paper is known (see, for example, Patent Document 1). For example, during printing, there is a risk that static electricity may accumulate on the cover that protects the nozzles of the liquid ejection head. The static electricity accumulated on the cover may enter the inside of the liquid ejection head from the nozzles and may damage the liquid ejection head. Therefore, it is necessary to take measures against static electricity charging for the liquid ejection head. As a measure against static electricity charging, it is conceivable to ground the cover that protects the nozzles. However, as a measure against static electricity charging, it was necessary to electrically connect the cover that protects the nozzles and the electrical interface connector, or to form the head holding plate that holds the liquid ejection head with a conductive member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is to provide a liquid ejection head that can easily take measures against static electricity charging.

Means for Solving the Problems

[0005] The liquid discharge head of the embodiment is a liquid discharge head fixed to a liquid discharge recording device by a conductive fastening member, and comprises a nozzle plate, a conductive nozzle cover, a non-conductive head holding plate, and a conductive ground plate. The nozzle plate has a nozzle formed on it. The nozzle cover covers the nozzle plate. The head holding plate has a first hole into which the fastening member is inserted. One end of the ground plate is positioned around the first hole of the head holding plate and is in contact with the fastening member and the nozzle cover. [Brief explanation of the drawing]

[0006] [Figure 1] A perspective view showing the configuration of a liquid dispensing head according to an embodiment. [Figure 2] A plan view showing the main components of a liquid dispensing head according to an embodiment. [Figure 3] A cross-sectional view showing the main components of the liquid discharge head according to the embodiment. [Figure 4] A cross-sectional view showing the main components of the liquid discharge head according to the embodiment. [Figure 5] A schematic diagram showing the configuration of a liquid discharge recording device according to this embodiment. [Modes for carrying out the invention]

[0007] Below, the liquid discharge head 1 and liquid discharge recording device 2 according to the embodiment will be described with reference to Figures 1 to 5. Figure 1 is a perspective view showing the configuration of the liquid discharge head 1. Figure 2 is a plan view showing the configuration of the head holding plate 1216 and the ground plate 16 of the liquid discharge head 1. Figure 3 is a cross-sectional view showing the configuration of the head holding plate 1216, the ground plate 16 and the nozzle cover 15 of the liquid discharge head 1. Figure 4 is a cross-sectional view showing the configuration of the head body 11 and the manifold unit 12 of the liquid discharge head 1. Figure 5 is an explanatory diagram schematically showing the configuration of the liquid discharge recording device 2 in which the liquid discharge head 1 is used. In each figure, the configuration is enlarged, reduced, or omitted as appropriate for explanatory purposes.

[0008] The liquid ejection head 1 is, for example, an inkjet head that ejects ink as a liquid from a nozzle 1141. The liquid ejection head 1 is installed in the liquid ejection recording device 2 shown in Figure 5. The liquid ejection head 1 is fixed inside the liquid ejection recording device 2 by a conductive fastening member 3. Here, the fastening member 3 is a screw or bolt made of a conductive material, such as a metal material. The liquid ejection head 1 is fixed to the liquid ejection recording device 2 in a position where, for example, the nozzle 1141 is facing downwards. Hereafter, the vertical direction of the liquid ejection head 1 will be defined and explained in the position where the nozzle 1141 of the liquid ejection head 1 is facing downwards.

[0009] The liquid ejection head 1 may be a non-circulating head that does not circulate ink, or it may be a circulating head that circulates ink. As shown in Figures 1 to 4, the liquid ejection head 1 comprises a head body 11, a manifold unit 12, a circuit board 13, an outer cover 14, a nozzle cover 15, and a ground plate 16. For example, the liquid ejection head 1 is a four-row integrated head having a pair of head bodies 11 each having a pair of actuators.

[0010] As shown in Figure 4, the head body 11 includes, for example, a base plate 111, a frame 112, an actuator 113, and a nozzle plate 114.

[0011] The base plate 111 is formed in the shape of a rectangular plate, for example, from a ceramic material. The base plate 111 is formed in the shape of a rectangle that is elongated in one direction. The base plate 111 has a single supply port 1111 and one or more discharge ports. A pair of actuators 113 are provided on the base plate 111, and a wiring pattern for driving the actuators 113 is formed thereon. The supply port 1111 and the discharge ports are through holes that penetrate between the two main surfaces of the base plate 111.

[0012] The frame 112 is fixed to one main surface of the base plate 111 with adhesive or the like. The frame 112 surrounds the supply port 1111, multiple discharge ports, and actuator 113 provided on the base plate 111.

[0013] The actuator 113 is formed as a long plate in one direction along the longitudinal direction of the base plate 111. A pair of actuators 113 are arranged at a predetermined interval in the short direction and bonded to the mounting surface of the base plate 111. Specifically, the actuator 113 is formed by bonding two long rectangular plates of piezoelectric material opposite each other so that their polarization directions are opposite. Here, the piezoelectric material is, for example, PZT (lead zirconate titanate). The actuator 113 is bonded to the mounting surface of the base plate 111 by, for example, a thermosetting epoxy adhesive.

[0014] The actuator 113 has, for example, a plurality of pressure chambers arranged at equal intervals in the longitudinal direction. On the main surface side of the actuator 113 opposite to the base plate 111, a plurality of grooves are formed in the longitudinal direction of the actuator 113, and these grooves form the pressure chambers. The main surface of the actuator 113 opposite to the base plate 111 is bonded to the nozzle plate 114. The actuator 113 also has a wiring pattern formed therein for driving the plurality of pressure chambers.

[0015] The pressure chamber is driven during printing or other operations by the liquid ejection head 1, causing ink to be ejected from the nozzle 1141 formed on the nozzle plate 114. In this embodiment, an example in which the actuator 113 has multiple pressure chambers has been described, but for example, the actuator 113 may have a configuration in which multiple pressure chambers and air chambers that do not eject ink are arranged alternately.

[0016] The nozzle plate 114 is formed in a long, plate-like shape along the longitudinal direction of the actuator 113. The nozzle plate 114 is fixed to the main surface of the frame 112 opposite to the base plate 111 with adhesive or the like. Multiple nozzles 1141 are formed on the nozzle plate 114, facing multiple pressure chambers formed on each of the actuators 113. The multiple nozzles 1141 facing the multiple pressure chambers are holes that spray ink when the liquid ejection head 1 performs operations such as printing. In this embodiment, since a pair of actuators 113 are provided, a pair of nozzle rows consisting of multiple nozzles 1141 is formed on the nozzle plate 114.

[0017] As shown in Figure 4, the manifold unit 12 comprises a manifold 121, a top plate 122, an ink supply pipe 123, and an ink discharge pipe 124. The number of ink supply pipes 123 and ink discharge pipes 124 can be set as appropriate.

[0018] The manifold 121 is formed in the shape of a plate or a block. The manifold 121 includes a supply passage 1211 that is continuous with the supply port 1111 of the base plate 111 and forms a liquid supply passage, a discharge passage that is continuous with the discharge port of the base plate 111 and forms a liquid discharge passage, and a cooling passage 1213 that forms a passage for cooling fluid. Since the manifold 121 is connected to a pair of head bodies 11, it has a pair of supply passages 1211 and a pair of discharge passages.

[0019] One main surface of the manifold 121 is fixed to the main surface of the base plate 111. The top plate 122 is fixed to the main surface of the manifold 121 opposite to the main surface to which the base plate 111 is fixed. Furthermore, the ink supply pipe 123 and ink discharge pipe 124 are fixed to the manifold 121, for example, via the top plate 122.

[0020] The manifold 121 includes, for example, a first manifold 1214 and a second manifold 1215. The manifold 121 is formed by integrally assembling the first manifold 1214 and the second manifold 1215.

[0021] The first manifold 1214 is formed in a rectangular plate shape that is long in one direction along the longitudinal direction of the base plate 111. The first manifold 1214 has, for example, grooves and openings that form part of a pair of supply paths 1211 and part of a pair of discharge paths. The grooves and openings that form part of the supply path 1211 and the discharge paths are appropriately set in terms of arrangement, size, etc. based on the shapes of the supply path 1211 and the discharge paths and the shapes of other fluid flow paths.

[0022] The second manifold 1215 is formed in a rectangular plate shape that is long in one direction along the longitudinal direction of the base plate 111. The second manifold 1215 has, for example, grooves and openings that form part of a pair of supply paths 1211 and part of a pair of discharge paths. The grooves and openings that form part of the supply path 1211 and the discharge paths are appropriately set in terms of arrangement, size, etc. based on the shapes of the supply path 1211 and the discharge paths and the shapes of other fluid flow paths.

[0023] Also, the second manifold 1215 doubles as a head holding plate that fixes the liquid ejection head 1 in the liquid ejection recording apparatus 2 by means of the fastening member 3. As a specific example, both ends in the longitudinal direction of the second manifold 1215 function as head holding plates 1216. In the following description, both ends of the second manifold 1215 will be described as a pair of head holding plates 1216. Note that the head holding plate 1216 may be a single member provided separately from the second manifold 1215. A datum hole (first hole) 12161 for fixing and aligning the liquid ejection head 1 is formed in the head holding plate 1216. The second manifold 1215 including the pair of head holding plates 1216 is formed of a non-conductive material.

[0024] The second manifold 1215 is formed to be longer in the longitudinal direction than the first manifold 1214 by the amount of the pair of head retaining plates 1216 at both ends. The pair of head retaining plates 1216 and the datum hole 12161 are used for alignment with the liquid ejection recording device 2 and for fixing to the liquid ejection recording device 2. As shown in Figure 3, at least one of the pair of head retaining plates 1216 has a recess 12162 for arranging the first end 161 of the earth plate 16 (described later), and an opening 12163 for arranging the earth plate 16 above and below the head retaining plate 1216.

[0025] The recess 1612 is formed to accommodate the first end 161 of the earth plate 16. For example, the recess 1612 is formed in the same shape as the first end 161 of the earth plate 16, defining the position of the first end 161 of the earth plate 16. The opening 12163 is a through hole that penetrates between the two main surfaces of the head holding plate 1216. The opening 12163 is formed in a shape that allows, for example, the second end 162 of the earth plate 16 to be inserted.

[0026] The top plate 122 is provided on the side opposite to the side on which the base plate of the manifold 121 is provided. The top plate 122 has openings that connect the ink supply pipe 123 and the ink discharge pipe 124 to the supply passage and discharge passage of the manifold 121.

[0027] The ink supply pipe 123 is connected to the supply path. The ink discharge pipe 124 is connected to the discharge path. In this embodiment, since the liquid ejection head 1 comprises a pair of head bodies 11, a pair of ink supply pipes 123 and ink discharge pipes 124 are provided.

[0028] One end of the circuit board 13 is connected to the wiring pattern of the actuator 113 via the wiring pattern of the base plate 111. The circuit board 13 includes, for example, a plurality of wiring films connected to each actuator via the base plate 111, a driver IC mounted on each wiring film, and a plurality of module boards connected to each actuator via the wiring films. The circuit board 13 also includes a plurality of relay flexible cables connected to each module board and an interface board to which the plurality of relay flexible cables are connected.

[0029] The circuit board 13 drives the actuator by applying a drive voltage to the actuator's wiring pattern using a driver IC, thereby increasing or decreasing the volume of the pressure chamber and ejecting droplets from the nozzle.

[0030] The outer cover 14 is a cover formed by joining two or more components together in a way that allows for a sealed connection, and by separating the components by thermal melting. The outer cover 14 covers a portion of the head body 11, a portion of the manifold unit 12, and at least a portion of the circuit board 13.

[0031] For example, the outer cover 14 is provided on the second manifold 1215 and covers each component arranged on the second manifold 1215. The outer cover 14 also exposes a portion of the ink supply pipe 123 and the ink discharge pipe 124 to the outside. Furthermore, the outer cover 14 exposes at least the area around the datum holes 12161 of the head holding plates 1216 at both ends of the second manifold 1215 to the outside without covering it, and covers the opening 12163 of the head holding plate 1216. The outer cover 14 is formed, for example, by joining multiple members.

[0032] The nozzle cover 15 covers, for example, the main outer surface of the nozzle plate 114, the outer periphery of the nozzle plate 114, the outer periphery of the frame 112, and the outer periphery of the base plate 111. The nozzle cover 15 also covers a portion of the manifold unit 12. At least a portion of the nozzle cover 15 is made of a conductive material, such as a metal material.

[0033] As a specific example, the nozzle cover 15 comprises a nozzle outer cover 151 and a nozzle protective cover 152. The nozzle outer cover 151 covers the main outer surface of the nozzle plate 114, the outer periphery of the nozzle plate 114, the outer periphery of the frame 112, and the outer periphery of the base plate 111. The nozzle outer cover 151 also has an opening 1511 that exposes a pair of nozzle rows. The nozzle outer cover 151 is made of, for example, a conductive material, such as a metal material.

[0034] The nozzle protection cover 152 is fixed to the outer surface of the nozzle outer cover 151. The nozzle protection cover 152 is formed of, for example, a conductive material, but may also be formed of a non-conductive material. The nozzle protection cover 152 has, for example, a portion of its upper surface spaced apart from the nozzle plate 114. The nozzle protection cover 152 has openings 1521 that face each nozzle row and expose each nozzle row. For example, since the opening 1521 of the nozzle protection cover 152 has a smaller opening area than the opening 1511 of the nozzle outer cover 151, the exposed area of ​​the nozzle plate 114 is reduced. As a result, the nozzle protection cover 152 prevents any material from coming into contact with the nozzle 1141 or the area around the nozzle 1141 when cleaning the nozzle cover 15, and protects the nozzle 1141.

[0035] The ground plate 16 is formed from a conductive material, such as a metal. The ground plate 16 comprises, for example, a first end (one end) 161 positioned on the head holding plate 1216, a second end (the other end) 162 in contact with the inner surface of the nozzle outer cover 151, and a continuous portion 163 that is elongated in one direction and connects the first end 161 and the second end 162. The first end 161 is integrally formed on one end of the continuous portion 163, and the second end 162 is integrally formed on the other end of the continuous portion 163. For example, the continuous portion 163 extends in a direction perpendicular or intersecting the direction in which the first end 161 extends, and the continuous portion 163 extends in a direction perpendicular or intersecting the direction in which the second end 162 extends. Such a ground plate 16 is formed, for example, by press-forming a single sheet of material.

[0036] For example, the first end portion 161 is formed in a rectangular shape, specifically, a rectangular shape that is elongated in one direction. The first end portion 161 has an insertion hole (second hole) 1611 formed in part into which the fastening member 3 can be inserted. For example, the first end portion 161 is positioned in a recess 12162 of the head retaining plate 1216, and the insertion hole 1611 faces the datum hole 12161 of the head retaining plate 1216. For example, the first end portion 161 is bonded to the upper surface of the recess 12162. The inner diameter of the insertion hole 1611 is, for example, larger than the inner diameter of the datum hole 12161, and is formed to have an inner diameter that can contact the head of the fastening member 3 inserted into the datum hole 12161.

[0037] The second end portion 162 is formed, for example, in the shape of a flat plate or a curved plate. The second end portion 162 contacts a part of the nozzle cover 15, for example, the inner surface of the nozzle outer cover 151, specifically the upper surface inside the nozzle outer cover 151.

[0038] The continuous portion 163 is formed to be elastically deformable. For example, as shown in Figure 3, the length of the continuous portion 163 is set such that the length from the first end 161 to the second end 162 of the earth plate 16 is longer than the distance from the upper surface of the recess 12162 of the head holding plate 1216 to the upper surface of the nozzle outer cover 151. More specifically, the vertical distance between the first end 161 and the second end 162 is longer than the vertical distance between the upper surface of the recess 12162 of the head holding plate 1216 and the upper surface of the nozzle outer cover 151.

[0039] Furthermore, the second end portion 162 and the continuous portion 163 are formed to be insertable into and positioned in an opening 12163 formed in the head holding plate 1216. Specifically, the widths of the second end portion 162 and the continuous portion 163 are formed to be smaller than the width of the first end portion 161. The second end portion 162 and the continuous portion 163 are positioned inside the nozzle cover 15, and the second end portion 162 contacts the upper surface of the nozzle outer cover 151. Also, for example, a part of the continuous portion 163 is positioned on the upper side of the head holding plate 1216 and is positioned in the gap between the head holding plate 1216 and the outer cover 14.

[0040] Next, a liquid ejection recording device 2 having a liquid ejection head 1 will be described with reference to Figure 5. The liquid ejection recording device 2 comprises a housing 2111, a media supply unit 2112, an image forming unit 2113, a media discharge unit 2114, a transport device 2115 which is a support device, and a control unit 2118.

[0041] The liquid ejection recording device 2 is an inkjet printer (printing device) that performs image formation processing on paper P by ejecting a liquid such as ink while transporting paper P, which is the recording medium to be printed, along a predetermined transport path 2001 from the media supply unit 2112 through the image forming unit 2113 to the media discharge unit 2114.

[0042] The media supply unit 2112 includes a plurality of paper feed cassettes 21121. The image forming unit 2113 includes a support unit 2120 for supporting paper and a plurality of head units 2130 positioned opposite each other above the support unit 2120. The media discharge unit 2114 includes a paper output tray 21141.

[0043] The support unit 2120 includes a conveyor belt 21201 provided in a loop shape in a predetermined area where image formation is performed, a support plate 21202 that supports the conveyor belt 21201 from the back, and a plurality of belt rollers 21203 provided on the back of the conveyor belt 21201.

[0044] The head unit 2130 comprises a liquid ejection head 1 which is a plurality of inkjet heads, a plurality of supply tanks 2132 which are liquid tanks mounted on each liquid ejection head 1, a pump 2134 which supplies ink, and a connecting channel 2135 which connects the liquid ejection head 1 and the supply tanks 2132.

[0045] In this embodiment, the liquid ejection head 1 comprises four liquid ejection heads 1 for cyan, magenta, yellow, and black, and four supply tanks 2132 each containing ink of one of these colors. The supply tanks 2132 are connected to the liquid ejection head 1 by a connecting channel 2135.

[0046] Pump 2134 is a liquid transfer pump, for example, a piezoelectric pump. Pump 2134 is connected to the control unit 2118 and is driven and controlled by the control unit 2118.

[0047] The connecting channel 2135 includes a supply channel connected to the ink supply pipe 123 of the liquid ejection head 1. The connecting channel 2135 also includes a recovery channel connected to the ink discharge pipe 124 of the liquid ejection head 1. For example, if the liquid ejection head 1 is a circulating type, the recovery channel is connected to the supply tank 2132.

[0048] The transport device 2115 transports the paper P along a transport path 2001 from the paper feed cassette 21121 of the media supply unit 2112, through the image forming unit 2113, to the paper output tray 21141 of the media discharge unit 2114. The transport device 2115 comprises a plurality of guide plate pairs 21211 to 21218 and a plurality of transport rollers 21221 to 21228 arranged along the transport path 2001. The transport device 2115 supports the paper P so that it can move relative to the liquid discharge head 1.

[0049] The control unit 2118 includes a CPU 21181 as an example of a processor, a memory such as ROM (Read Only Memory) for storing various programs, RAM (Random Access Memory) for temporarily storing various variable data and image data, and an interface unit for inputting data from the outside and outputting data to the outside.

[0050] In the liquid discharge head 1 and liquid discharge recording device 2 configured in this way, the ground plate 16 is electrically connected to the conductive nozzle outer cover 151 of the nozzle cover 15. The ground plate 16 is also positioned around the datum hole 12161, which is a fixing hole for the non-conductive head holding plate 1216. In this embodiment, a recess 12162 is provided in the head holding plate 1216, and the first end 161 of the ground plate 16 is bonded to the recess 12162, so that the datum hole 12161 of the head holding plate 1216 and the insertion hole 1611 of the first end 161 face each other. As a result, when the liquid discharge head 1 is fixed to the liquid discharge recording device 2 with a conductive fastening member 3, the fastening member 3 comes into contact with the ground plate 16, so that the nozzle cover 15 can be grounded to the liquid discharge recording device 2.

[0051] With this configuration, the liquid ejection head 1 can avoid damage to the driver IC and other components due to static electricity generated by the transport of paper P, without requiring separate grounding of the nozzle cover 15 on the liquid ejection recording device 2 side. Furthermore, by fixing the liquid ejection head 1 to the liquid ejection recording device 2 with the fastening member 3, the nozzle cover 15 can be grounded via the ground plate 16, making grounding easy and preventing forgetting to ground it. Therefore, static electricity buildup on, for example, the nozzle cover 15 of the liquid ejection head 1 can be prevented, thus preventing damage to electronic components such as the driver IC.

[0052] Furthermore, the distance between the first end 161 and the second end 162 of the earth plate 16 is greater than the vertical distance between the upper surface of the recess 12162 of the head holding plate 1216 and the upper surface of the nozzle outer cover 151. Therefore, when the first end 161 of the earth plate 16 is fixed to the upper surface of the recess 12162 of the head holding plate 1216 and the second end 162 of the earth plate 16 comes into contact with the upper surface of the nozzle outer cover 151, the continuous portion 163 undergoes elastic deformation. As a result, the second end 162 is pressed against the upper surface of the nozzle outer cover 151, and thus comes into close contact with the upper surface of the nozzle outer cover 151. In this way, the earth plate 16 functions as a leaf spring, allowing it to easily and reliably come into contact with the upper surface of the nozzle outer cover 151 simply by fixing the first end 161 to the head holding plate 1216.

[0053] Furthermore, since the head holding plate 1216 is grounded by a separate earth plate 16, the head holding plate 1216 can be made of a non-conductive material. The second manifold 1215, which includes the head holding plate 1216, can be made of a material that is easy to shape into complex forms, such as alumina or resin material.

[0054] According to the liquid discharge head 1 and liquid discharge recording device 2 of the above-described embodiment, measures against electrostatic charge can be easily implemented.

[0055] It should be noted that the embodiments are not limited to the examples described above. For example, in the examples described above, the earth plate 16 was configured to contact the upper surface of the recess 12162 of the head holding plate 1216 and the upper surface inside the nozzle outer cover 151 of the nozzle cover 15. However, the earth plate 16 may also be configured to contact the nozzle protection cover 152, or it may be configured to contact the lower surface of the head holding plate 1216 or the outer surface of the nozzle cover 15. Furthermore, the earth plate 16 may be configured to contact the nozzle protection cover 152, which is made of a conductive material, in addition to or instead of the nozzle outer cover 151.

[0056] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0057] 1…Liquid ejection head, 2…Liquid ejection recording device, 3…Fastening member, 11…Head body, 111…Base plate, 1111…Supply port, 112…Frame, 113…Actuator, 114…Nozzle plate, 1141…Nozzle, 12…Manifold unit, 121…Manifold, 1211…Supply path, 1213…Cooling path, 1214…First manifold, 1215…Second manifold, 1216…Head holding plate, 12161…Datum hole (first hole), 12162…Recess, 12163…Opening, 122…Top plate, 123…Ink supply pipe, 124…Ink discharge pipe, 13…Circuit board, 14…Outer cover, 15…Nozzle cover, 151…Nozzle outer cover, 1511…Opening, 152…Nozzle protective cover -, 1521...Opening, 16...Ground plate, 161...First end (one end), 1611...Insertion hole (second hole), 1612...Recess, 162...Second end (the other end), 163...Continuous section, 2001...Conveyor path, 2111...Housing, 2112...Media supply section, 21121...Paper feed cassette, 2113...Image forming section, 2114...Media discharge section, 21141...Paper discharge tray I, 2115...Conveying device, 2118...Control unit, 2120...Support unit, 21201...Conveying belt, 21202...Support plate, 21203...Belt roller, 21211~21218...Guide plate pair, 21221~21228...Conveying roller, 2130...Head unit, 2132...Supply tank, 2134...Pump, 2135...Connecting channel, P...Paper.

Claims

1. A liquid dispensing head fixed to a liquid dispensing recording device by a conductive fastening member, A nozzle plate on which a nozzle is formed, A conductive nozzle cover that covers the nozzle plate, A non-conductive head-holding plate having a first hole into which the fastening member is inserted, One end of the conductive ground plate is positioned around the first hole of the head holding plate and contacts the fastening member and the nozzle cover. A liquid dispensing head equipped with a liquid dispensing head.

2. The head holding plate has an opening into which the earth plate can be inserted. The liquid discharge head according to claim 1, wherein the earth plate is positioned in the opening and in contact with the inner surface of the nozzle cover.

3. The earth plate has one end positioned on the upper surface of the head holding plate and the other end in contact with the upper surface of the nozzle cover. The liquid discharge head according to claim 2, wherein the length from one end of the earth plate to the other end is longer than the distance from the upper surface of the head holding plate to the upper surface of the nozzle cover.

4. The liquid dispensing head according to claim 3, wherein one of the ends is bonded to the upper surface of the head holding plate.

5. The liquid dispensing head according to any one of claims 1 to 4, wherein one end of the head holding plate has a second hole formed therein, which is positioned opposite to the first hole of the head holding plate and into which the fastening member is inserted.

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