Inkjet recording device

Abstract

An inkjet recording device (I) comprises a print head (1), a controller (100), and a connection cable (107) that connects the print head (1) and the controller (100) and supplies ink from the controller (100) to the print head (1). The print head (1) has: a head body (1A) to which a connection cable (107) is connected and which supplies ink to a nozzle (12); and a head module (1B) that can be attached to and detached from the head body (1A), the head module (1B) housing the nozzle (12), a charge electrode (13), a deflection electrode (15), and a gutter (16). The connection cable (107) or the head body (1A) is provided with a valve (a fourteenth valve (V14)) that opens and closes an ink supply path to the nozzle (12), and the head module (1B) is provided with a high voltage generation unit (18) that generates a high voltage to be applied to the deflection electrode (15).

Description

Inkjet recording device

[0001] The present disclosure relates to a continuous inkjet recording apparatus.

[0002] An example of a continuous inkjet recording device is disclosed in Patent Document 1. Specifically, Patent Document 1 discloses an inkjet recording device that includes a print head, a controller, and a connection cable that electrically and fluidly connects the print head and the controller.

[0003] According to Patent Document 1, the print head contains therein nozzles that eject ink or solvent, charging electrodes that charge the ink, deflection electrodes that deflect the ink, and a gutter that collects undeflected ink or solvent.

[0004] Japanese Patent Application Laid-Open No. 2021-091181

[0005] As described in Patent Document 1, the print head contains nozzles, charging electrodes, deflection electrodes, and gutters, and therefore the connection cable connecting the controller and print head is made up of multiple conduits and electrical wiring, such as a supply pipe for supplying ink, a recovery pipe for recovering ink, and electrical wiring for applying a predetermined voltage to the charging electrodes and deflection electrodes.

[0006] When a connection cable such as that disclosed in Patent Document 1 is used, the inkjet recording apparatus has a so-called integrated configuration in which the print head and the controller are connected via the connection cable.

[0007] Generally, when manufacturing a print head, an installation process is required to install and adhere charging electrodes, deflection electrodes, etc., inside the print head. After the installation process is complete, the print head must be dried in a high-temperature chamber. Various tests may also be performed in parallel with or before or after the drying process. One such test may be an inspection of the operation of the nozzles installed inside the print head.

[0008] However, when the above-mentioned integrated configuration is used, the existence of such work and inspections becomes an obstacle to improving the productivity of the inkjet recording apparatus.

[0009] For example, during the drying process, not only the print head but also the controller must be placed in a high-temperature room, which requires a lot of time and effort, such as securing space for the controller and transporting it in, and ultimately hinders productivity improvements.

[0010] Furthermore, if an abnormality is found in various print head inspections, even if there is no problem with the controller, the inkjet recording device as a whole cannot be completed as a product until the print head abnormality is resolved, which again hinders productivity improvement.

[0011] The present disclosure has been made in view of the above points, and an object thereof is to improve the manufacturing efficiency of inkjet recording apparatuses, and ultimately improve their productivity.

[0012] A first aspect of the present disclosure relates to a continuous type inkjet recording device comprising: a print head that houses therein a nozzle that ejects particulate ink, a charging electrode that charges the particulate ink ejected from the nozzle, a deflection electrode that deflects the flight direction of the ink charged by the charging electrode, and a gutter that collects ink that has been undeflected by the deflection electrode, and that ejects the ink deflected by the deflection electrode to the outside; a controller that has an ink supply unit that supplies ink to the print head and a control unit that controls the supply of ink from the ink supply unit to the print head; and a cable that connects the print head and the controller and supplies ink from the controller to the print head.

[0013] According to a first aspect of the present disclosure, the print head comprises a head main body to which the cable is connected and which supplies ink to the nozzles via the cable, and a head module that is detachable from the head main body and houses the nozzles, the charging electrode, the deflection electrode, and the gutter, wherein the cable or the head main body is provided with a valve that opens and closes a circulation path for circulating ink or solvent between the cable and the head module, and the head module is provided with a high voltage generating unit that generates a high voltage to be applied to the deflection electrode.

[0014] According to the first aspect, part of the print head is modularized as a head module that can be attached to and detached from the head body. This head module houses the nozzles, charging electrodes, and deflection electrodes, and also incorporates a high-voltage generator for generating a high voltage (e.g., several kV) for the deflection electrodes.

[0015] By incorporating the high-voltage generator into the head module, high-voltage signals caused by the high-voltage generator are not transmitted between the head main body and the head module, which shortens the insulation distance and makes it possible to simplify and compact the connection between the head main body and the head module.

[0016] By using such a head module, during the manufacture of the inkjet recording device, it is possible to remove the head module from the head main body and dry it, and if an abnormality is found during inspection of the head module, it is possible to replace it with another head module that is not defective and complete the product. As a result, it is possible to increase the manufacturing efficiency of the inkjet recording device and, ultimately, improve productivity.

[0017] According to a second aspect of the present disclosure, the valve may transition from an open state to a closed state upon receiving a control signal from the control unit when the head module is detached from the head main body.

[0018] According to the second aspect, when the head module is removed from the head main body during the manufacture of the inkjet recording apparatus, it is possible to suppress leakage of ink from the head main body.

[0019] In general, ink leakage pollutes the surrounding environment of a factory, requiring a lot of effort to clean up. Considering this effort, ink leakage is inconvenient for improving the manufacturing efficiency of inkjet recording devices.

[0020] In contrast to this, by suppressing ink leakage as in the second aspect, it is possible to improve the productivity of the inkjet recording apparatus.

[0021] According to a third aspect of the present disclosure, the head main body or the head module may have a sensor that detects that the head module has been removed from the head main body.

[0022] Furthermore, according to a fourth aspect of the present disclosure, the control unit may prohibit application of a high voltage signal to the charging electrode on condition that the head module is detached from the head main body.

[0023] According to the fourth aspect, when removing the head module, it is possible to prevent the user from getting an electric shock without turning off the power to the controller. Therefore, the head module can be safely removed even when the controller is in an active state. This allows various manufacturing processes to proceed efficiently, and improves the productivity of the inkjet recording device.

[0024] Furthermore, according to a fifth aspect of the present disclosure, the head module may have a memory unit that stores at least one of information indicating the ink type, information regarding the lifespan of the inkjet recording device, and correction information for adjusting the high voltage generated by the high voltage generating unit.

[0025] According to the fifth aspect, by providing a memory unit in the head module, it is possible to read information from the head module alone without moving the print head, and therefore the entire inkjet recording device, which results in efficient performance of various inspections and improved productivity of the inkjet recording device.

[0026] Furthermore, according to a sixth aspect of the present disclosure, the print head may have a first locking mechanism that prevents the head module from falling off the head body, and a second locking mechanism that prevents the first locking mechanism from being released.

[0027] According to the sixth aspect, by providing not only the first locking mechanism but also the second locking mechanism, it is possible to prevent unintended detachment due to human error, thereby enabling various manufacturing processes to proceed efficiently and improving the productivity of the inkjet recording device.

[0028] According to a seventh aspect of the present disclosure, the inkjet recording device may further include a mounting portion connected to the head body for positioning and fixing the print head.

[0029] According to the seventh aspect, it is possible to reduce stress acting on the connection between the head main body and the head module, particularly stress from the cable, thereby stabilizing the positioning of the print head.

[0030] According to an eighth aspect of the present disclosure, the inkjet recording device may further include a mounting portion connected to the head module for positioning and fixing the print head.

[0031] According to the eighth aspect, by providing an attachment portion to the head module located at the tip side of the print head, it is possible to stabilize the landing position of ink ejected from the head module, thereby stabilizing the printing accuracy of the print head.

[0032] As described above, according to the present disclosure, it is possible to improve the manufacturing efficiency of inkjet recording apparatuses, and in turn, improve the productivity thereof.

[0033] FIG. 1 is a diagram illustrating the overall configuration of an inkjet recording system. FIG. 2A is a block diagram illustrating the schematic configuration of an inkjet recording apparatus. FIG. 2B is a block diagram illustrating the schematic configuration of an inkjet recording apparatus. FIG. 3 is a diagram illustrating the schematic configuration of a print head. FIG. 4 is a diagram illustrating the paths of ink and solvent in an inkjet recording apparatus. FIG. 5A is an exploded perspective view illustrating the configuration of a head main body and a head module. FIG. 5B is a perspective view illustrating an assembled print head. FIG. 6A is a perspective view illustrating the structure of a first engagement portion of the head main body. FIG. 6B is a perspective view illustrating the structure of a second engagement portion of the head module. FIG. 7 is a flowchart illustrating a removal sequence under normal conditions. FIG. 8 is a flowchart illustrating a removal sequence under abnormal conditions. FIG. 9 is a flowchart illustrating an installation sequence. FIG. 10A is a diagram corresponding to FIG. 5A illustrating the configuration of a head main body and a head module according to a first modified example. FIG. 10B is a diagram corresponding to FIG. 5B illustrating an assembled print head according to the first modified example. FIG. 11A is a perspective view illustrating the first and second locking mechanisms. FIG. 11B is a perspective view illustrating the first and second locking mechanisms. FIG. 12 is a side view illustrating the operation of the first and second locking mechanisms. FIG. 13 is a view corresponding to FIG. 8 illustrating a removal sequence according to a first modified example. FIG. 14 is a view corresponding to FIG. 9 illustrating a mounting sequence according to the first modified example. FIG. 15 is a view illustrating a display screen according to the first modified example. FIG. 16 is a view illustrating a display screen according to the first modified example. FIG. 17 is a view corresponding to FIG. 3 illustrating a print head according to a second modified example. FIG. 18 is a side view illustrating an attachment portion according to this embodiment. FIG. 19 is a view corresponding to FIG. 18 illustrating an attachment portion according to the second modified example. FIG. 20 is a view corresponding to FIG. 3 illustrating a print head according to a third modified example. FIG. 21 is a view corresponding to FIG. 4 illustrating an inkjet recording apparatus according to the third modified example.

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the following description is for illustrative purposes only.

[0035] In other words, although this specification describes an industrial inkjet printer as an example of an inkjet recording device, the technology disclosed herein can be applied to general equipment configured to eject ink particles and land them on a print target such as a workpiece, regardless of whether it is called an inkjet recording device or an industrial inkjet printer.

[0036] Furthermore, in this specification, printing by an inkjet recording device will be described, but "printing" here includes all processing using inkjet technology, such as printing characters and marking figures.

[0037] <Overall Configuration> Fig. 1 is a diagram illustrating an example of the overall configuration of an inkjet recording system S. Also, Figs. 2A and 2B are diagrams illustrating an example of the schematic configuration of an inkjet recording apparatus I, and Fig. 3 is a diagram illustrating an example of the schematic configuration of a print head 1 in the inkjet recording apparatus I. Finally, Fig. 4 is a diagram illustrating an example of the paths of ink and solvent in the inkjet recording apparatus I.

[0038] The inkjet recording system S illustrated in FIG. 1 is installed on a conveying line L in a factory or the like, for example, and is configured to print on each print target W flowing along the conveying line L in order. The application of the present disclosure is not limited to the inkjet recording system S. It can also be applied to printing systems that use methods other than automatic methods. The conveying line L can be configured, for example, with a belt conveyor. The term "print target" may also be referred to as "print object" in the following description.

[0039] Specifically, the inkjet recording system S includes an inkjet recording apparatus I that performs printing by causing particulate ink (ink particles) to land on a print target W, and an operation terminal 800 and external device 900 that are connected to the inkjet recording apparatus I. Note that the operation terminal 800 and the external device 900 are not essential.

[0040] The inkjet recording device I shown in Figures 1 to 3 comprises a print head 1 that ejects ink droplets from nozzles 12 and causes the ink droplets to land on a print substrate W, and a controller 100 that supplies control signals, ink, and solvent to the print head 1. The controller 100 controls the trajectory of the ink droplets by supplying control signals to the print head 1. This adjusts the landing positions of the ink droplets on the print substrate W, thereby achieving the desired printing. The print head 1 is fixed in a predetermined position by a support member 2 or the like.

[0041] The inkjet recording apparatus I is a continuous ink jet printer (CIJ). That is, in order to prevent clogging (particularly clogging of the nozzles 12) caused by ink volatilization, ink is constantly circulating inside the inkjet recording apparatus I as long as the inkjet recording apparatus I is in operation, even when not printing. By adopting a continuous system, quick-drying ink can be used without causing clogging due to ink.

[0042] The inkjet recording apparatus I according to this embodiment is also capable of adjusting the ink concentration (viscosity) by mixing the ink with a solvent. The inkjet recording apparatus I can also clean various parts of the print head 1, such as the nozzles 12, by sending a solvent to the print head 1. The solvent used for cleaning can be recovered as needed and reused to adjust the ink concentration (viscosity).

[0043] To achieve ink circulation, the print head 1 is equipped with nozzles 12 that eject ink or solvent, as well as a gutter 16 that collects the ink or solvent ejected from the nozzles 12 (see FIG. 3). The ink or solvent sent from the controller 100 to the print head 1 is ejected from the nozzles 12 and collected by the gutter 16. The collected ink or solvent is sent back to the controller 100 and reused. By repeating this process, the ink can be circulated.

[0044] On the other hand, the operation terminal 800 has, for example, a central processing unit (CPU) and a storage device, and is connected to the controller 100. This operation terminal 800 determines print settings and functions as a terminal for presenting information related to printing to the user.

[0045] The print settings set by the operation terminal 800 are output to the controller 100 and stored in its storage unit 102. In addition to or instead of the storage unit 102 of the controller 100, the operation terminal 800 may store the print settings.

[0046] The print settings according to this embodiment may include conditions and parameters related to the attachment / detachment process described below, in addition to the content of the character string to be printed.

[0047] The operation terminal 800 can be integrated into the controller 100, for example. In this case, the term "operation terminal" is not used, but rather a term such as a control unit is used.

[0048] The external device 900 is connected to the controller 100 as necessary. In the example shown in Figures 1 and 2A, the external device 900 includes a workpiece detection sensor 901, a conveying speed sensor 902, and a programmable logic controller (PLC) 903.

[0049] Specifically, the workpiece detection sensor 901 detects the presence or absence of a print object W on the conveying line L, and outputs a signal (detection signal) indicating the detection result to the controller 100. The detection signal output from the workpiece detection sensor 901 functions as a trigger (print trigger) for starting printing.

[0050] The transport speed sensor 902 is composed of, for example, a rotary encoder, and is capable of detecting the transport speed of the print substrate W. The transport speed sensor 902 outputs a signal (detection signal) indicating the detection result to the controller 100. The controller 100 controls the timing of ejecting ink droplets from the print head 1 based on the detection signal input from the transport speed sensor 902.

[0051] 2A, the PLC 903 is electrically connected to the controller 100. The PLC 903 is used to control the inkjet printing system S in accordance with a predetermined sequence.

[0052] In addition to the above-mentioned devices and equipment, devices for operation and control, computers for performing various other processes, storage devices, peripheral devices, etc. can also be connected to the inkjet recording apparatus I. In such cases, the connection method may be either wired or wireless.

[0053] <Controller 100> The controller 100 is configured to electrically control the print head 1 and to be able to supply ink for printing and a solvent for diluting the ink to the print head 1.

[0054] Specifically, the controller 100 according to this embodiment includes, as components related to electrical control, a memory unit 102 that stores the print settings described above, a control unit 101 that controls each part of the controller 100 and the print head 1, an operation display unit 103 that accepts operations by the user and displays information to the user, and a power supply unit 121 that directs power supplied from outside to the control unit 101.

[0055] The controller 100 also includes components related to the supply of ink and the like, such as an ink supply unit 104, a solvent supply unit 105, and an ink tank 106. These components are directly or indirectly fluidly connected to the print head 1. In at least this embodiment, the controller 100 houses the ink supply unit 104, the solvent supply unit 105, and the control unit 101 inside.

[0056] The ink supply unit 104 has an ink reservoir 42 that detachably receives an ink cartridge 41 that contains ink. The ink supply unit 104 supplies ink to the print head 1.

[0057] On the other hand, the solvent supply unit 105 has a solvent reservoir 52 that detachably receives a solvent cartridge 51 that contains a solvent. The solvent supply unit 105 supplies the solvent to the print head 1.

[0058] The ink tank 106 stores, as printing ink, the ink from the ink cartridge 41 received in the ink reservoir 42 and the solvent from the solvent cartridge 51 received in the solvent reservoir 52. The term "printing ink" used here refers to a mixture of solvent and ink (for example, ink whose concentration has been adjusted by the solvent).

[0059] The print head 1 then prints using printing ink from the ink tank 106. The print head 1 also cleans the nozzles 12 and other components within the print head 1 with solvent supplied from a solvent supply unit 105 that bypasses the ink tank 106.

[0060] The control unit 101 may be configured as a separate unit from the ink supply unit 104 and the solvent supply unit 105. The memory unit 102 may also be configured as a separate unit from the ink supply unit 104 and the solvent supply unit 105. The operation display unit 103 may also be configured as a separate unit from the ink supply unit 104 and the solvent supply unit 105. In these cases, the components can be combined to form the controller 100.

[0061] Furthermore, regarding the ink supply unit 104 and the ink tank 106 as independent components is merely a classification for the sake of convenience. From the viewpoint of being related to the supply of ink, the ink tank 106 may be considered as one element of the ink supply unit 104.

[0062] (Memory unit 102) The memory unit 102 is configured to store print settings set via the operation display unit 103 or the operation terminal 800 described below, and to output the stored print settings to the control unit 101 based on a control signal from outside.

[0063] Specifically, the storage unit 102 is configured using a volatile memory, a non-volatile memory, a solid state drive (SSD), a hard disk drive (HDD), etc., and can temporarily or continuously store information indicating print settings. Note that, if the operation terminal 800 is incorporated into the controller 100, the operation terminal 800 may also serve as the storage unit 102.

[0064] (Controller 101 ) The controller 101 is a processing unit that controls the supply of ink from the ink supply unit 104 to the print head 1 , and also controls the supply of solvent from the solvent supply unit 105 to the print head 1 .

[0065] In detail, the control unit 101 controls at least the ink supply unit 104 and solvent supply unit 105 in the controller 100, and the nozzles 12, charging electrodes 13, and deflection electrodes 15 in the print head 1, based on the print settings stored in the memory unit 102. The control unit 101 controls each unit, so that printing on the print target W is performed at a predetermined timing.

[0066] More specifically, the control unit 101 has, for example, a CPU, a memory, an input / output bus, etc., and generates a control signal based on a signal indicating information input via the operation display unit 103 or the operation terminal 800 and a signal indicating print settings read from the storage unit 102. The control unit 101 controls printing on the print target W by outputting the generated control signal to the controller 100 and each part of the inkjet recording apparatus I.

[0067] For example, when printing on the print target W, the control unit 101 reads the print content for the print target W stored in the storage unit 102 and generates a control signal based on the print content. Then, the control unit 101 outputs the control signal to the charging electrode 13, thereby setting the flight direction of the ink droplets so as to achieve a landing position corresponding to the print content.

[0068] - Other functional elements in the control unit 101 - The control unit 101 according to this embodiment also includes an attachment / detachment processing unit 101a, as shown in Fig. 2A, as a functional element that executes processing related to attachment / detachment processing. Details of the attachment / detachment processing unit 101a will be described later.

[0069] 1, the operation display unit 103 includes a display unit 103a that displays information to the user and an operation unit 103b that accepts operations by the user. The operation display unit 103 can be provided, for example, on a housing that constitutes the controller 100, but it may also be configured separately from the housing and set in a location different from the housing. Furthermore, if an operation terminal 800 is incorporated into the controller 100, the operation terminal 800 may also serve as the operation display unit 103.

[0070] The display unit 103a displays various information related to the inkjet recording apparatus I. The display unit 103a is configured with, for example, a liquid crystal display panel or an organic EL display panel, and changes the display mode upon receiving a control signal from the control unit 101. The display unit 103a can display a user interface for operating each unit of the inkjet recording system S, a user interface for determining print settings, and a user interface related to the above-mentioned attachment / detachment process.

[0071] The operation unit 103b is configured by, for example, a touch panel, buttons, switches, etc. When a user operates the operation unit 103b, information corresponding to the operation input (operation information) is input to the control unit 101, and the control unit 101 can detect what operation has been performed. For example, by operating the operation unit 103b, it is possible to switch the power of the inkjet recording apparatus I on / off, perform various settings, input information, etc.

[0072] This operation display unit 103 can also set print settings, similar to the above-mentioned operation terminal 800. The print settings set by the operation display unit 103 are output to the controller 100 and stored in its storage unit 102. In the following description, it is assumed that the user operates the operation display unit 103, but the operation terminal 800 can also be used instead of the operation display unit 103.

[0073] (Ink supply unit 104) The ink supply unit 104 supplies ink from the ink cartridge 41 as printing ink to the nozzles 12 of the print head 1. At this time, the ink from the ink supply unit 104 is supplied to the print head 1 via an ink tank 106.

[0074] Specifically, the ink supply unit 104 according to this embodiment has, as its main components, the ink cartridge 41 and ink reservoir 42 described above, a hollow ink needle 43 as a hollow needle, and an ink supply tube 44. The ink hollow needle 43 fluidly connects the ink cartridge 41 and the ink supply tube 44. The ink supply tube 44 fluidly connects the ink cartridge 41 and the print head 1 via the ink hollow needle 43. An ink tank 106 is disposed midway along the ink supply tube 44, which runs from the ink hollow needle 43 to the print head 1.

[0075] Of these, the ink cartridge 41 contains ink. The ink reservoir 42 detachably receives the ink cartridge 41. By replacing the ink cartridge 41 with the ink reservoir 42, the ink tank 106 can be replenished with ink. In other words, the inkjet recording apparatus I according to this embodiment is configured as a so-called "cartridge-type" inkjet printer.

[0076] As shown only in FIG. 4, the ink reservoir 42 is provided with a first attachment sensor SW1 that detects whether the ink cartridge 41 or the solvent cartridge 51 is attached to the ink reservoir 42.

[0077] The ink hollow needle 43 accesses the ink in the ink cartridge 41 when the ink reservoir 42 receives the ink cartridge 41 (when the ink cartridge 41 is attached to the ink reservoir 42).

[0078] The ink supply pipe 44 constitutes a path for supplying printing ink to the print head 1. The path formed by the ink supply pipe 44 allows ink to circulate between the print head 1 and the controller 100.

[0079] As will be described later, the ink supply pipe 44 is provided with a plurality of on-off valves, including the first valve V1, and a plurality of pumps, including the first pump P1. Each of these on-off valves is configured as an electromagnetic valve. Each on-off valve receives a control signal from the control unit 101 to open or close, thereby controlling the flow of ink. Meanwhile, each pump receives a control signal from the control unit 101 to pump ink, thereby controlling the flow of ink in the same manner as the on-off valves. Note that at least some of the on-off valves (e.g., the first valve V1, the eighth valve V8, the eleventh valve V11, and the eighteenth valve V18 in FIG. 4 ) may be manual cocks instead of electromagnetic valves.

[0080] (Solvent supply unit 105) The solvent supply unit 105 supplies the solvent from the solvent cartridge 51 to the ink tank 106 in the same way as the ink, or supplies the solvent alone to the nozzles 12. The former solvent adjusts the concentration of the ink, and together with the ink, it forms printing ink and is supplied to the print head 1.

[0081] When forming printing ink together with ink (i.e., when printing is performed on the print head 1), the solvent from the solvent supply unit 105 is led to the nozzle 12 via the ink tank 106. On the other hand, when the solvent is supplied alone, the solvent from the solvent supply unit 105 is led to the nozzle 12 without passing through the ink tank 106.

[0082] Specifically, the solvent supply unit 105 according to this embodiment has, as its main components, the above-mentioned solvent cartridge 51, solvent reservoir 52, hollow solvent needle 53, and solvent supply pipe 54. The hollow solvent needle 53 fluidly connects the solvent cartridge 51 and the solvent supply pipe 54. The solvent supply pipe 54 fluidly connects, via the hollow solvent needle 53, the solvent cartridge 51 and the print head 1, and the solvent cartridge 51 and the ink tank 106.

[0083] Of these, the solvent cartridge 51 contains a solvent. The solvent reservoir 52 detachably receives the solvent cartridge 51. By replacing the solvent cartridge 51 with the solvent reservoir 52, it is possible to replenish the solvent for concentration adjustment and the solvent for cleaning. In other words, the inkjet recording apparatus I according to this embodiment is configured as a "cartridge-type" inkjet printer for solvent as well.

[0084] As shown only in FIG. 4, the solvent reservoir 52 is provided with a second attachment sensor SW2 that detects whether the solvent cartridge 51 or the ink cartridge 41 is attached to the solvent reservoir 52.

[0085] The hollow solvent needle 53 accesses the solvent in the solvent cartridge 51 when the solvent reservoir 52 receives the solvent cartridge 51 (when the solvent cartridge 51 is attached to the solvent reservoir 52).

[0086] The solvent supply pipe 54 constitutes a path for supplying solvent to the ink tank 106, and for supplying solvent to the print head 1 without the ink tank 106. These paths make it possible to produce printing ink from ink and solvent, and to clean the print head 1 with solvent.

[0087] The classification of the ink supply pipe 44 and the solvent supply pipe 54 is merely a convenient classification made for the sake of simplicity of explanation. The ink supply pipe 44 and the solvent supply pipe 54 are essentially inseparable because they are connected to each other or one serves the other.

[0088] As will be described later, the solvent supply pipe 54 is provided with a plurality of on-off valves, including the twelfth valve V12, and a plurality of pumps, including the second pump P2. Each of these on-off valves is configured as a solenoid valve. Each on-off valve receives a control signal from the control unit 101 to open or close, thereby controlling the flow of the solvent. Meanwhile, each pump receives a control signal from the control unit 101 to pump the solvent, thereby controlling the flow of the solvent in the same manner as the solenoid valves. As mentioned above, manual cocks may be used instead of the solenoid valves.

[0089] (Ink Tank 106) The ink tank 106 is configured to store the ink from the ink cartridge 41 and the solvent from the solvent cartridge 51. More specifically, the ink tank 106 is configured as a container that stores ink whose concentration (viscosity) has been adjusted with a solvent, i.e., a mixture of ink and solvent.

[0090] The printing ink supplied from the ink tank 106 to the nozzles 12 lands on the surface of the print target W during printing, and is collected by the gutter 16 and returned to the ink tank 106 during non-printing. This allows the printing ink to be circulated.

[0091] In addition, the solvent supplied to the nozzle 12 for cleaning can also be collected by the gutter 16 and then sent to the ink tank 106 via, for example, a conditioning tank (not shown) dedicated to the solvent, where it can be reused to adjust the ink concentration.

[0092] The ink tank 106 is also provided with a storage sensor 106a for detecting the liquid level (so-called liquid surface level) within the tank. The storage sensor 106a is electrically connected to the control unit 101, and inputs its detection signal to the controller 100. The storage sensor 106a may be configured as an electrode-type level sensor, a float-type level sensor, or a capacitance-type level sensor.

[0093] (Power Supply Unit 121 ) The power supply unit 121 is interposed between the commercial power supply 700 and the control unit 101 , and can relay power supplied from the commercial power supply 700 and supply it to the control unit 101 .

[0094] (Other Components) The controller 100 is provided with a connection cable 107, which is a bundle of covered power wiring for sending and receiving control signals, tubes for sending and receiving ink (specifically, the tubes that make up the ink supply pipe 44), and tubes for sending and receiving solvent (specifically, the tubes that make up the solvent supply pipe 54). This connection cable 107 is flexible, and is connected to the upper end of the print head 1 (see Figure 1). The controller 100 and print head 1 are electrically and fluidically connected via this connection cable 107.

[0095] The connection cable 107 connects the print head 1 and the controller 100 and is capable of supplying ink from the controller 100 to the print head 1, and exemplifies the "cable" in this embodiment.

[0096] <Print Head 1> The print head 1 ejects ink (printing ink) whose concentration has been adjusted based on a control signal, ink, and solvent supplied from the controller 100, in the form of particulate ink (hereinafter also referred to as "ink particles"). The print head 1 deflects the flight direction of the ejected ink particles and causes the deflected ink particles to land on the surface of the print target W, thereby executing printing on the print target W. The details of the printing at this time follow the print settings described above. The print head 1 can print sequentially on each of the print target W in accordance with the print settings.

[0097] Specifically, as shown in Figure 3, the print head 1 according to this embodiment includes a pressurizer 11, a nozzle 12, a charging electrode 13, a deflection electrode 15, a gutter 16, a cleaning nozzle 17, a high-voltage generator 18, and a memory unit 19. The pressurizer 11 applies pressure to the printing ink to turn it into particulate ink. The nozzle 12 ejects the particulate ink. The charging electrode 13 charges the particulate ink ejected from the nozzle 12. The deflection electrode 15 deflects the flying deflection of the printing ink charged by the charging electrode 13. The gutter 16 recovers the printing ink that has been undeflected by the deflection electrode 15, or the solvent ejected from the nozzle 12.

[0098] In addition, as elements related to the acquisition of various parameter values, the print head 1 is equipped with a charge detection sensor 14 that monitors the charge state of the printing ink, and a gutter sensor 16b that detects whether ink has entered the gutter 16.

[0099] The print head 1 houses a pressure device 11, a nozzle 12, a charging electrode 13, a charge detection sensor 14, a deflection electrode 15, a gutter 16, a cleaning nozzle 17, a high-voltage generating unit 18, and a memory unit 19, and ejects printing ink deflected by the deflection electrode 15 to the outside. The inkjet recording apparatus I according to this embodiment performs printing by causing the ink deflected by the deflection electrode 15 to land on a printing target.

[0100] More specifically, the print head 1 includes a housing 10 that accommodates a pressurizer 11, a nozzle 12, a charging electrode 13, a charge detection sensor 14, a deflection electrode 15, a gutter 16, a gutter sensor 16b, a cleaning nozzle 17, a high-voltage generator 18, and a memory unit 19, and defines an ink droplet flight space S1. The print head 1 is capable of ejecting ink droplets deflected by the deflection electrode 15 to the outside of the housing 10 through the flight space S1.

[0101] 3, the housing 10 extends in the vertical direction on the paper. In the following description, the longitudinal direction of the housing 10 will be simply referred to as the "vertical direction," while the two directions perpendicular to this vertical direction will be referred to as the "front-rear direction" and the "left-right direction," respectively. In other figures, the corresponding directions will also be referred to as the "vertical direction," "front-rear direction," and "left-right direction," respectively.

[0102] Here, "top" refers to the top side of the page in Fig. 3, and "bottom" refers to the bottom side of the page. Similarly, "front" refers to the front side of the page in Fig. 3 (specifically, the front left side), "back" refers to the back side of the page (specifically, the back right side), "left" refers to the left side of the page (specifically, the upper left side), and "right" refers to the right side of the page (specifically, the lower right side). In other figures, the corresponding terms are referred to as "top," "bottom," "front," "back," "left," and "right," respectively.

[0103] The print head 1 does not necessarily have its up-down direction aligned with the vertical direction (the direction of gravity). The print head 1 can also be oriented with its up-down direction aligned with the horizontal direction.

[0104] The print head 1 also has ink ejection ports 10a for ejecting ink deflected by the deflection electrodes 15 to the outside. As shown in Figure 3, these ink ejection ports 10a open to the bottom surface of a housing 10 that forms the outer shape of the print head 1. Hereinafter, the ink ejection ports 10a will also be simply referred to as ejection ports 10a. Ink droplets are ejected from these ejection ports 10a downward into the housing 10.

[0105] 1, during printing, the print head 1 is supported, for example, by a support member 2. When supported by the support member 2, the print head 1 is positioned so that its ejection ports 10a face from above the printing surface of the print substrate W. This location is an example of where the print head 1 may be installed when printing using the inkjet recording apparatus I.

[0106] Below, we will explain each part of the print head 1 in order. In the following description, the "up-down direction" refers to the direction along the vertical. For example, the top of the paper in Figure 3 corresponds to the "upward direction," and the bottom of the ground in the same figure corresponds to the "downward direction."

[0107] 3, the pressurizer 11 is disposed near the upper end of the flight space S1 of the housing 10. This pressurizer 11 is configured to receive printing ink from the ink tank 106 via a connection cable 107.

[0108] The pressurizer 11 pressurizes the ink liquid supplied from the ink tank 106. The ink pressurized by the pressurizer 11 is supplied to the nozzles 12. Although not shown in the drawings, the pressurizer 11 according to this embodiment is grounded.

[0109] (Nozzle 12) The nozzle 12 is connected to the lower end of the pressurizer 11 and is positioned with its open end (printing ink) facing downward. This nozzle 12 has a piezoelectric element (for example, a piezo element) that applies up and down vibrations to the ink, and applies up and down vibrations to the ink pressurized by the pressurizer 11 before ejecting it from the ejection port (open end). This vibration causes the ink liquid ejected from the nozzle 12 to become particles a predetermined time after the ejection timing.

[0110] Here, printing ink ejected from the nozzle 12 without being subjected to vibration (excited) flows as a shaft-shaped so-called "ink shaft." On the other hand, printing ink ejected from the nozzle 12 after being subjected to vibration (excited) is shaft-shaped immediately after being ejected from the nozzle 12, but becomes particulate as it moves away from the nozzle 12. The particulate printing ink becomes so-called "ink particles." Regardless of whether the printing ink is an ink shaft or ink particles, it passes through the charged electrode 13.

[0111] In addition, if the nozzle 12 is equipped with a piezoelectric element, the ink atomization can be controlled by the voltage (piezoelectric voltage) applied to the piezoelectric element. In this embodiment, the controller 100 is configured to apply a controllable piezoelectric voltage to the piezoelectric element of the nozzle 12.

[0112] The solvent supplied to clean the inside of the print head 1 passes through the pressurizer 11 and the nozzle 12 in that order, and is then ejected from the tip of the nozzle 12. The ejected solvent flows axially and passes through the charging electrode 13.

[0113] 4 is connected to the nozzle 12 as a return path for releasing pressure inside the print head 1 when, for example, the inkjet recording apparatus I is shut down. Solvent can also be sucked from the nozzle 12 through this suction path 47.

[0114] (Charged electrode 13) As illustrated in Fig. 3, the charged electrode 13 is made up of a pair of electrically conductive metal plates, and is arranged below the nozzle 12. Here, the pair of metal plates that make up the charged electrode 13 are fixed to the housing 10 in an orientation in which their respective longitudinal directions are aligned in the up-down direction and in which they face each other horizontally. The distance between the pair of metal plates is set to be larger than the particle size of the ink ejected from the nozzle 12, so that the printing ink ejected from the nozzle 12 passes between the pair of metal plates. Note that the number of metal plates that make up the charged electrode 13 does not need to be a pair.

[0115] A potential (positive potential) is applied to the charging electrode 13 at least when a printing operation is performed. This generates a potential difference between the pressure generator 11 and the charging electrode 13, making it possible to charge ink droplets passing through the charging electrode 13. In order to charge each ink droplet, the charging electrode 13 according to this embodiment is disposed near a breakpoint where the printing ink ejected from the nozzle 12 breaks down into particles.

[0116] More specifically, a pulse potential that can be controlled by the controller 100 is applied to the charging electrode 13. When a relatively high voltage is applied to the charging electrode 13, the amount of charge (magnitude of negative charge) of each ink particle becomes larger compared to when a lower voltage is applied. When each ink particle has a large charge, it is deflected more by the deflection electrode 15 compared to when the charge is small. The controller 100 can control the amount of deflection of the ink particle by adjusting the magnitude of the pulse potential. The ink particle charged by the charging electrode 13 passes by the side of the charge detection sensor 14 and reaches the deflection electrode 15.

[0117] Furthermore, the solvent discharged from the nozzle 12 passes by the side of the charge detection sensor 14 and reaches the deflection electrode 15 without being charged.

[0118] 2B , the charging electrode 13 is electrically connected to the control unit 101. The charging electrode 13 generates a potential difference for charging the ink particles by receiving an electrical signal (the aforementioned pulse potential) from the control unit 101. The magnitude (voltage value) of the pulse potential input to the charging electrode 13 from the control unit 101 is a high voltage, for example, in the range of 200 V or more and 400 V or less.

[0119] 3, the charge detection sensor 14 is disposed below the charging electrode 13. More specifically, the charge detection sensor 14 is disposed below the metal plate (the metal plate on the right side of the drawing in the example) that constitutes the charging electrode 13 so as not to intersect with the trajectory of the flying ink particles. By disposing the charge detection sensor 14 in this manner, it is possible to avoid collisions between the ink particles and the charge detection sensor 14.

[0120] Furthermore, the charge detection sensor 14 according to this embodiment is connected to a circuit board provided inside the housing 10. The charge detection sensor 14 can detect the charge state of ink particles passing by it (particularly the amount of charge on each ink particle). The detection result by the charge detection sensor 14 is output to the control unit 101 as a detection signal. Based on this detection signal, the control unit 101 can determine whether each ink particle is appropriately charged.

[0121] 3, the deflection electrode 15 is composed of a pair of electrically conductive metal plates (so-called "opposing electrodes"), and is disposed below the charging electrode 13 and the charge detection sensor 14. The pair of metal plates are fixed to the housing 10 in such a manner that their respective longitudinal directions are aligned substantially vertically and that they face each other horizontally. Ink particles that pass between the pair of metal plates that make up the charging electrode 13 will then pass between the pair of metal plates that make up the deflection electrode 15.

[0122] A voltage (hereinafter also referred to as "deflection voltage") that can be controlled by the controller 100 is applied to the deflection electrode 15. As a result, a potential difference corresponding to the deflection voltage is generated between the pair of metal plates that make up the deflection electrode 15. This potential difference can deflect the flight direction of ink particles according to the charge amount of the ink particles. The flight direction of the ink particles can be deflected along the alignment direction of the pair of metal plates that make up the deflection electrode 15.

[0123] That is, the flight direction of the ink particles can be controlled via the deflection voltages applied to the charging electrode 13 and the deflection electrode 15, respectively. The ink particles whose flight direction is controlled in this way include those deflected by the deflection electrode 15 and those not deflected by the deflection electrode 15 (non-deflected ink particles). Of these, the ink particles deflected by the deflection electrode 15 are involved in printing on the print target W. The ink particles deflected by the deflection electrode 15 are ejected from the ejection port 10a provided on the bottom surface of the housing 10 and land on the print target W.

[0124] On the other hand, ink particles that are not deflected by the deflection electrode 15 do not participate in printing on the print substrate W. These ink particles, or axial printing ink that has not been atomized in the first place, reach the gutter 16, as shown by the dashed line in Figure 3. Similarly, the solvent used to clean the nozzles 12, etc. of the print head 1 and that has passed through the deflection electrode 15 also reaches the gutter 16.

[0125] Specifically, the deflection electrode 15 according to this embodiment is composed of first and second electrode plates 151 and 152 facing each other. The first electrode plate 151 is grounded. The first electrode plate 151 can also be called a ground electrode.

[0126] 3, the gutter 16 is configured as a curved pipe with its opening 16a facing upward, and is disposed below the deflection electrode 15. The gutter 16 according to this embodiment can collect printing ink that is not involved in printing on the print target W and the solvent that has passed through the nozzle 12 (specifically, the solvent ejected from the nozzle 12).

[0127] More specifically, in this embodiment, the opening 16a of the gutter 16 and the open end of the nozzle 12 are arranged to face each other, and the open end of the nozzle 12 is located directly above the opening 16a of the gutter 16. By arranging them in this manner, it becomes possible for the fluid that flows or is ejected vertically from the open end of the nozzle 12 to be received by the opening 16a of the gutter 16.

[0128] The gutter 16 is provided with a charge-type or thermistor-type gutter sensor 16b (see FIG. 3). The gutter sensor 16b detects whether printing ink is in the gutter 16, and determines that ink axis adjustment is complete if printing ink is in the gutter 16, and determines that ink axis adjustment is not complete if printing ink is not in the gutter 16. The gutter sensor 16b is connected to the control unit 101 of the controller 100, and is configured to output a signal to the control unit 101.

[0129] The printing ink or solvent collected by the gutter 16 is returned to the controller 100 via the ink supply pipe 44, the solvent supply pipe 54, etc., and is stored in the ink tank 106.

[0130] The printing ink or solvent collected by the gutter 16 is returned to the controller 100 via the ink supply pipe 44, the solvent supply pipe 54, etc., and is stored in the ink tank 106.

[0131] (Cleaning nozzle 17) As shown in Figure 3, the cleaning nozzle 17 is provided inside the print head 1. The cleaning nozzle 17 functions as a so-called solvent spraying unit. The cleaning nozzle 17 is a nozzle for spraying a solvent onto the nozzles 12, charging electrodes 13, deflection electrodes 15, etc. of the print head 1 to clean them, and is capable of spraying out solvent as a cleaning liquid. The solvent sprayed from the cleaning nozzle 17 is supplied from a solvent supply unit 105, for example, a solvent cartridge 51.

[0132] (High Voltage Generator 18) The high voltage generator 18 generates a high voltage to be applied to the deflection electrode 15. More specifically, the high voltage generator 18 according to this embodiment is electrically connected to the second electrode plate 152. As shown in FIG. 2B , the high voltage generator 18 is electrically connected to the control unit 101. The high voltage generator 18 generates a high voltage based on an electrical signal input from the control unit 101. Note that the magnitude (voltage value) of the electrical signal input from the control unit 101 to the high voltage generator 18 is at least lower than the magnitude (voltage value) of the electrical signal input from the control unit 101 to the charging electrode 13.

[0133] When high voltage generating unit 18 applies a high voltage to second electrode plate 152, a potential difference is generated between first electrode plate 151 and second electrode plate 152. The magnitude of the high voltage applied by high voltage generating unit 18 may be set within a range of 3 kV or more and 11 V or less, more specifically, within a range of 5 kV or more and 9 kV or less, or even more specifically, within a range of 6 kV or more and 8 kV or less.

[0134] (Storage Unit 19) The storage unit 19 stores at least one of information indicating the ink type, information regarding the lifespan of the inkjet recording apparatus I, and correction information for adjusting the high voltage generated by the high voltage generating unit 18. The storage unit 19 is configured with a non-volatile memory such as a so-called flash memory. Specific examples of the contents stored in the storage unit 19 will be described later.

[0135] (Regarding other features) Another feature of the print head 1 according to this embodiment is that it is constructed by assembling a head main body 1A to which a connection cable 107 is connected, and a head module 1B that is detachable from the head main body 1A, as shown in Figures 1, 2A, 2B and 3.

[0136] The configuration and structure of the head main body 1A and head module 1B are closely related to the supply of ink from the ink supply unit 104 to the print head 1. Therefore, before describing the head main body 1A and head module 1B in detail, the configuration related to the distribution paths of ink and solvent in the inkjet recording apparatus I, specifically the configuration related to the ink supply pipe 44 and solvent supply pipe 54, will be described with reference to FIG.

[0137] <Ink and Solvent Distribution Paths> As described above, the ink supply pipe 44 supplies ink from the ink cartridge 41 to the ink tank 106, and also supplies printing ink from the ink tank 106 to the print head 1. Meanwhile, the solvent supply pipe 54 supplies solvent from the solvent cartridge 51 to both the print head 1 and the ink tank 106.

[0138] -First Route R1- The ink supply pipe 44 constitutes a route (first route R1) for sending ink (ink before concentration adjustment) from the ink cartridge 41 to the ink tank 106, for example.

[0139] 5, the first path R1 according to the present embodiment is configured by a first ink tube 44a, a second ink tube 44b, and a third ink tube 44c, which serve as ink flow tubes. In the present embodiment, the first ink tube 44a, the second ink tube 44b, and the third ink tube 44c are all disposed inside the controller 100.

[0140] The first ink tube 44a has one end connected to the hollow needle 43 and the other end branching into a second ink tube 44b and a third ink tube 44c (see branching portion B1 in FIG. 5). The first ink tube 44a, which serves as an ink distribution tube, connects the ink hollow needle 43 and the ink tank 106 via the second ink tube 44b and the third ink tube 44c, allowing ink to flow from the ink hollow needle 43 to the ink tank 106. In this embodiment, ink is introduced into the ink tank 106 via the third ink tube 44c, but it may also be introduced via the second ink tube 44b, for example. In this case, the ink is introduced into the ink tank 106 without passing through the viscometer 46.

[0141] The classification of the ink tubes as the first ink tube 44a, the second ink tube 44b, and the third ink tube 44c is merely for convenience. For example, the first ink tube 44a and the second ink tube 44b may be considered as a single ink distribution tube. In that case, the ink distribution tube formed by the first ink tube 44a and the second ink tube 44b would directly connect the ink hollow needle 43 and the ink tank 106.

[0142] A first pump P1 is disposed midway along the first ink tube 44a. This first pump P1 is a suction pump that draws ink from the ink hollow needle 43 to the first ink tube 44a, causing the ink to flow.

[0143] A junction 45 is disposed in the first ink tube 44a between the ink hollow needle 43 and the first pump P1. This junction 45 is configured to merge the solvent or ink in the first ink tube 44a. In particular, the junction 45 illustrated in FIG. 5 is connected to the third solvent tube 54c of the solvent supply tube 54 and is configured to merge the solvent of the ink and solvent with the ink flowing in the first ink tube 44a. The ink that merges in the first ink tube 44a may be printing ink.

[0144] An eighth valve V8 is disposed in the first ink pipe 44a between the junction 45 and the first pump P1. The eighth valve V8 is an on-off valve that opens and closes the flow path of the first ink pipe 44a.

[0145] The second ink tube 44b connects the other end (branch portion B1) of the first ink tube 44a to the ink tank 106. A first valve V1 is disposed midway along the second ink tube 44b. This first valve V1 is an on-off valve that opens and closes the flow path of the second ink tube 44b.

[0146] The third ink tube 44c connects the other end (branch portion B1) of the first ink tube 44a to the ink tank 106. An eleventh valve V11 is disposed midway along the third ink tube 44c. This eleventh valve V11 is an on-off valve that opens and closes the flow path of the third ink tube 44c.

[0147] Furthermore, a viscometer 46 is disposed in the third ink tube 44c between the eleventh valve V11 and the ink tank 106. This viscometer 46 detects the flow rate of the ink or printing ink flowing through the third ink tube 44c and measures the viscosity based on that flow rate. The viscometer 46 inputs a detection signal corresponding to the measurement result to the control unit 101. Note that, although the present embodiment uses a viscometer 46 that operates on the principle of detecting the ink flow rate, the present invention is not limited to this. For example, a viscometer 46 that repeatedly fills and discharges ink and measures the viscosity based on the time it takes for the ink to be discharged may also be used.

[0148] Ink from the ink cartridge 41 is supplied to the ink tank 106 by passing through the ink hollow needle 43, the ink reservoir 42, the first ink tube 44a, the second ink tube 44b and the third ink tube 44c in that order based on the operating status of the first pump P1 and the open / close status of the first valve V1, the fifth valve V5 and the eighth valve V8.

[0149] - Second Route R2 - Meanwhile, the solvent supply pipe 54, together with some elements of the ink supply pipe 44, constitutes a route (second route R2) for sending the solvent from the solvent cartridge 51 to the ink tank 106.

[0150] 5, the second path R2 according to this embodiment is made up of the first solvent pipe 54a of the solvent supply pipe 54, a portion of the first ink pipe 44a (the portion from the connection point B2 to the branch point B1 in FIG. 5), and the entire second ink pipe 44b and the entire third ink pipe 44c. In this embodiment, the first solvent pipe 54a is disposed inside the controller 100.

[0151] As mentioned above, the names ink supply pipe 44 and solvent supply pipe 54 are given for convenience only, focusing on one side of each flow pipe. The first ink pipe 44a, the second ink pipe 44b, and the third ink pipe 44c may serve both ink and solvent. Each flow pipe may contribute to the formation of one or more paths.

[0152] The first solvent pipe 54a has one end connected to the ink hollow needle 43 and the other end (connection portion B2) connected to the first ink pipe 44a. A thirteenth valve V13 is disposed midway along the first solvent pipe 54a in the solvent supply pipe 54. The thirteenth valve V13 is an on-off valve that opens and closes the flow path of the first solvent pipe 54a.

[0153] The solvent from the solvent cartridge 51 passes through the hollow solvent needle 53, the solvent reservoir 52, and the first solvent pipe 54a in this order, depending on the operating status of the first pump P1 and the open / close status of the thirteenth valve V13, and is then supplied to a midpoint of the first ink pipe 44a (see connection B2 in FIG. 5). The solvent supplied to this point passes through the first ink pipe 44a, the second ink pipe 44b, and the third ink pipe 44c in this order, depending on the open / close status of the first valve V1 and the eleventh valve V11, and is then supplied to the ink tank 106.

[0154] The ink supplied through the first route R1 has its concentration adjusted by the solvent supplied through the second route R2, and thus the ink for printing is stored in the ink tank 106.

[0155] —Third Route R3— Returning to the explanation of the ink supply pipe 44, this ink supply pipe 44 also constitutes a route (third route R3) for circulating and stirring the contents (printing ink) of the ink tank 106 within the controller 100.

[0156] 5, the third path R3 according to this embodiment is made up of the fourth ink tube 44d and the fifth ink tube 44e of the ink supply tube 44, a portion of the first ink tube 44a (the portion from the connection portion B2 to the branch portion B1 in FIG. 5), and the entire second ink tube 44b and the entire third ink tube 44c. In this embodiment, the fourth ink tube 44d and the fifth ink tube 44e are both disposed inside the controller 100.

[0157] The fourth ink tube 44d has one end connected to the ink tank 106 and the other end (connection portion B2) connected to the first ink tube 44a. A ninth valve V9 is disposed midway along the fourth ink tube 44d. This ninth valve V9 is an on-off valve that opens and closes the flow path of the fourth ink tube 44d.

[0158] The fifth ink tube 44e has one end connected to the ink tank 106 and the other end (connection part B2) connected to the first ink tube 44a. A fifth valve V5 is disposed midway along the fifth ink tube 44e. This fifth valve V5 is an on-off valve that opens and closes the flow path of the fifth ink tube 44e.

[0159] In addition, the connection position between the fourth ink tube 44d and the ink tank 106 (the position where printing ink is sucked by the fourth ink tube 44d) is positioned higher in the height direction of the ink tank 106 than the connection position between the fifth ink tube 44e and the ink tank 106 (the position where printing ink is sucked by the fifth ink tube 44e).

[0160] The printing ink in the ink tank 106 is sucked out by the fourth ink tube 44d or the fifth ink tube 44e based on the operating status of the first pump P1 and the open / close status of the first valve V1, the fifth valve V5, the ninth valve V9, and the eleventh valve V11, and then passes through a part of the first ink tube 44a (the portion from the connection part B2 to the branch part B1 in FIG. 5), the second ink tube 44b, and the third ink tube 44c in that order before being sent back to the ink tank 106. In this way, the printing ink circulates within the controller 100.

[0161] Furthermore, by configuring the controller 100 so that the printing ink is not simply circulated within the controller 100 but is instead drawn out from two locations at different heights, the printing ink can be stirred within the ink tank 106. This makes it possible to make the concentration of the printing ink uniform (maintaining the pigment dispersion state). This configuration is particularly effective when pigment ink is used.

[0162] -Fourth Route R4- The ink supply pipe 44 further constitutes a route (fourth route R4) for sending printing ink from the ink tank 106 to the nozzles 12 and returning printing ink from the gutter 16 to the ink tank 106.

[0163] 5, the fourth path R4 according to this embodiment is made up of the sixth ink tube 44f and the seventh ink tube 44g of the ink supply tube 44. Both the sixth ink tube 44f and the seventh ink tube 44g connect the controller 100 and the print head 1.

[0164] The sixth ink tube 44f has one end connected to the ink tank 106 and the other end connected to the nozzle 12. A third pump P3 is disposed midway along the sixth ink tube 44f. The third pump P3 is a suction pump that draws ink from the ink tank 106 to create a flow toward the sixth ink tube 44f.

[0165] A fourteenth valve V14 is disposed in the sixth ink pipe 44f between the third pump P3 and the nozzle 12. The fourteenth valve V14 is an on-off valve that opens and closes the flow path of the sixth ink pipe 44f.

[0166] The seventh ink tube 44g has one end connected to the gutter 16 and the other end connected to the ink tank 106. A fourth pump P4 is disposed midway along the seventh ink tube 44g. The fourth pump P4 is a suction pump that draws ink from the gutter 16 to create a flow toward the seventh ink tube 44g.

[0167] A tenth valve V10 is disposed in the seventh ink pipe 44g between the gutter 16 and the fourth pump P4. The tenth valve V10 is an on-off valve that opens and closes the flow path of the seventh ink pipe 44g.

[0168] The printing ink in the ink tank 106 is sucked out by the sixth ink pipe 44f depending on the operating status of the third pump P3 and the open / close status of the fourteenth valve V14, and is ejected from the nozzle 12. The printing ink ejected from the nozzle 12 lands on the surface of the print substrate W during printing, and is collected by the gutter 16 when not printing. The latter printing ink is sucked out by the seventh ink pipe 44g depending on the operating status of the fourth pump P4 and the open / close status of the tenth valve V10, and is sent back to the ink tank 106. In this way, the printing ink circulates between the controller 100 and the print head 1.

[0169] -Fifth Route R5- Meanwhile, the solvent supply pipe 54, together with some elements of the ink supply pipe 44, constitutes a route (fifth route R5) for feeding the cleaning solvent from the solvent cartridge 51 to the nozzles 12.

[0170] 5, the fifth path R5 according to this embodiment is made up of a portion of the first solvent pipe 54a (the upstream end including the connection portion with the hollow solvent needle 53), the second solvent pipe 54b, and a portion of the sixth ink pipe 44f (the downstream end including the connection portion with the nozzle 12) in the solvent supply pipe 54. The second solvent pipe 54b connects the controller 100 and the print head 1.

[0171] The second solvent pipe 54b has one end connected to the first solvent pipe 54a between the hollow solvent needle 53 and the thirteenth valve V13, and the other end connected to the sixth ink pipe 44f between the fourteenth valve V14 and the nozzle 12. A second pump P2 is disposed midway along the second solvent pipe 54b in the solvent supply pipe 54. The second pump P2 is a suction pump that draws in the solvent to generate a flow from the hollow solvent needle 53 toward the solvent supply pipe 54 (particularly the second solvent pipe 54b).

[0172] A twelfth valve V12 is disposed in the second solvent pipe 54b between the second pump P2 and the nozzle 12. The twelfth valve V12 is an on-off valve that opens and closes the flow path of the second solvent pipe 54b in the solvent supply pipe 54.

[0173] Depending on the operating status of the second pump P2 and the open / close status of the twelfth valve V12, the solvent from the solvent cartridge 51 passes through the hollow solvent needle 53, the solvent reservoir 52, the first solvent pipe 54a, and the second solvent pipe 54b in that order, and is supplied to a portion midway through the sixth ink pipe 44f (the portion between the fourteenth valve V14 and the nozzle 12). The solvent supplied to this portion is ejected from the nozzle 12. This solvent cleans the print head 1.

[0174] The second solvent pipe 54b is connected to the cleaning nozzle 17. As described above, the cleaning nozzle 17 is capable of spraying a solvent as a cleaning liquid. A fifteenth valve V15 is provided between the cleaning nozzle 17 and the second solvent pipe 54b to control the supply of solvent to the cleaning nozzle 17.

[0175] - Sixth Route R6 - The solvent supply pipe 54 further constitutes a route (sixth route R6) for feeding the solvent from the solvent cartridge 51 to the ink supply pipe 44 and the ink hollow needle 43 via the junction 45.

[0176] As shown in FIG. 5 , the sixth path R6 in this embodiment is composed of a portion of the first solvent line 54a, a portion of the second solvent line 54b, and a third solvent line 54c in the solvent supply line 54. Note that the "portion of the first solvent line 54a" refers to the section from the solvent hollow needle 53 to the connection point B3 between the first solvent line 54a and the second solvent line 54b. The "portion of the second solvent line 54b" refers to the section from the connection point B3 between the first solvent line 54a and the second solvent line 54b to a position between the second pump P2 and the twelfth valve V12 (see connection point B4 in FIG. 5 ). The sixth path R6 branches off from the fifth path R5 downstream of the second pump P2. In this embodiment, the third solvent line 54c is disposed within the controller 100.

[0177] The third solvent pipe 54c has one end connected to the second solvent pipe 54b between the second pump P2 and the twelfth valve V12, and the other end connected to the junction 45.

[0178] The third solvent pipe 54c, together with the portion of the first solvent pipe 54a and the portion of the second solvent pipe 54b, constitutes a "solvent flow pipe" in this embodiment. When the solvent reservoir 52 receives the solvent cartridge 51, the third solvent pipe 54c flows the solvent in the solvent cartridge 51 to the junction 45 via the first solvent pipe 54a and the second solvent pipe 54b.

[0179] The second pump P2 is disposed in the second solvent pipe 54b that constitutes the solvent flow pipe. This second pump P2 can also be considered as a solvent pump that operates to generate a flow from the second solvent pipe 54b through the junction 45 and the first ink pipe 44a toward the ink hollow needle 43.

[0180] An eighteenth valve V18 is disposed in the second solvent pipe 54b between the junction 45 and the second pump P2. The eighteenth valve V18 is a second on-off valve that opens and closes the flow path of the second solvent pipe 54b.

[0181] -Paths Related to Ink Suction- The controller 100 also has paths related to ink suction. For example, the controller 100 has a suction path 47 connected to the nozzles 12. A sixth valve V6 is provided in the suction path 47. For example, when not printing, by operating the first pump P1 with the sixth valve V6 open, ink can be sucked through the suction path 47 and the sucked ink can be sent back to the controller 100.

[0182] <Detailed structure of print head 1> Fig. 5A is an exploded perspective view illustrating the configuration of the head main body 1A and head module 1B, and Fig. 5B is a perspective view illustrating the print head 1 after assembly. Also, Fig. 6A is a perspective view illustrating the structure of the first engagement portion 10b of the head main body 1A, and Fig. 6B is a perspective view illustrating the structure of the second engagement portion 10c of the head module 1B. Fig. 18 is a diagram illustrating an attachment portion 91 in this embodiment.

[0183] As shown in Figures 2B and 3, the print head 1 has a head main body 1A to which a connection cable 107 is connected, and a head module 1B that is detachable from the head main body 1A. The head main body 1A supplies ink or solvent to the nozzles 12 via the connection cable 107. The head module 1B houses the nozzles 12, charging electrodes 13, deflection electrodes 15, and gutters 16. The print head 1 is assembled by attaching the head module 1B to the head main body 1A. Note that for the relationship between the print head 1 and the head module 1B, please also refer to the shaded area in Figure 4.

[0184] 18, the connection cable 107, head main body 1A, and head module 1B are connected in this order from top to bottom. An attachment part 91 that positions and fixes the print head 1 is connected to the head main body 1A. The print head 1 is connected to the support member 2 via the attachment part 91. More specifically, in this embodiment, the attachment part 91, which extends in the vertical direction, is connected to the rear surface of the head main body 1A (the rear surface of the first housing part 60, which will be described later).

[0185] The print head 1 also has elements associated with the assembly structure described above, including a high-voltage generating unit 18, a memory unit 19, a first sensor 21, a second sensor 22, a first magnet 23, and a second magnet 24. Below, we will explain the details of the head main body 1A and the head module 1B, as well as the elements associated with these assembly structures.

[0186] (Head main body 1A) As shown in Figures 1 and 3, the head main body 1A is a component to which the connection cable 107 is connected. The head main body 1A can be called the "base end" of the print head 1, or the "support section" that supports the head module 1B against gravity. The head main body 1A is located between the head module 1B and the connection cable 107, and can also be called a "relay section" that supplies ink or solvent to the head module 1B via the connection cable 107.

[0187] Specifically, the head main body 1A according to this embodiment has a first housing portion 60, a cable connection portion 61, and a first engagement portion 62.

[0188] The first housing 60 has a shape that extends in the vertical direction, for example, a rectangular cylindrical shape. The first housing 60, together with the second housing 70 of the head module 1B, constitutes the housing 10 of the entire print head 1.

[0189] As shown in Figure 3, the first housing portion 60 houses an ink supply path (ink supply pipe 44), a solvent supply path (solvent supply pipe 54), a twelfth valve V12 and a fourteenth valve V14, a first sensor 21, and a second sensor 22.

[0190] When the head module 1B is attached to the head main body 1A, the ink supply pipe 44 is fluidly connected to the nozzles 12. This ink supply pipe 44 is opened and closed by, for example, a 14th valve V14. As shown in Figures 2B and 3, the 14th valve V14 is located in the head main body 1A, not in the head module 1B.

[0191] In this way, the head main body 1A is provided with a valve (fourteenth valve V14) that opens and closes the flow path that allows ink to flow between the head main body 1A and the head module 1B. In particular, in this embodiment, the head main body 1A is provided with a valve (fourteenth valve V14) that opens and closes the ink supply path to the nozzles 12. Note that it is not essential to provide the fourteenth valve V14 to the head main body 1A.

[0192] Similarly, when the head module 1B is attached to the head main body 1A, the solvent supply path (solvent supply pipe 54) and the nozzle 12 are fluidly connected. This solvent supply pipe 54d is opened and closed by, for example, a twelfth valve V12. As shown in Figures 2B and 3, a fourteenth valve V14 is located in the head main body 1A, not in the head module 1B.

[0193] In other words, in this embodiment, the head main body 1A is provided with a valve (twelfth valve V12) that opens and closes the solvent supply path to the nozzle 12. Note that it is not essential to provide the head main body 1A with the twelfth valve V12.

[0194] 2B , the twelfth valve V12 and the fourteenth valve V14 are electrically connected to the control unit 101. The twelfth valve V12 and the fourteenth valve V14 transition from a closed state to an open state upon receiving a control signal from the control unit 101. The twelfth valve V12 and the fourteenth valve V14 transition from an open state to a closed state upon receiving a control signal from the control unit 101.

[0195] The first sensor 21 is a sensor that detects that the head module 1B has been removed from the head main body 1A. In this embodiment, the first sensor 21 is configured by a Hall element. The first sensor 21 is electrically connected to the control unit 101, and inputs a detection signal to the control unit 101.

[0196] The first sensor 21, which is formed by a Hall element, is located at the lower end of the head main body 1A, as shown in Fig. 3. When the head module 1B is attached to the head main body 1A, the first sensor 21 is positioned so as to be aligned with the first magnet 23 of the head module 1B in the vertical direction.

[0197] The second sensor 22, like the first sensor 21, is a sensor that detects that the head module 1B has been removed from the head main body 1A. In this embodiment, the first sensor 21 is configured using a Hall element. The second sensor 22 is electrically connected to the control unit 101, and inputs a detection signal to the control unit 101.

[0198] The second sensor 22, which is formed by a Hall element, is located at the lower end of the head main body 1A, as shown in Fig. 3. When the head module 1B is attached to the head main body 1A, the second sensor 22 is positioned so as to be aligned with the second magnet 24 of the head module 1B in the vertical direction.

[0199] As shown in Fig. 2B, the first sensor 21 and the second sensor 22 are configured such that at least some of their electrical paths are independent. The term "electrical path" here refers to a path formed by electrical wiring. In the example shown in Fig. 3, the first electrical path 21a and the second electrical path 22a are independent. With this configuration, even if one of the first electrical path 21a and the second electrical path 22a is disconnected, the detection signal can still be input to the control unit 101 via the other path.

[0200] It should be noted that it is not essential to provide the head main body 1A with the first sensor 21 and the second sensor 22. At least one of the first sensor 21 and the second sensor 22 may be provided in the head module 1B.

[0201] - Cable connection part 61 - As shown in Fig. 5A, the cable connection part 61 is located at the upper end of the head main body 1A. The cable connection part 61 has a tubular shape, for example, a cylindrical shape, that opens upward. One end of the connection cable 107 is connected to the cable connection part 61.

[0202] By connecting the connection cable 107 to the cable connection section 61, the controller 100 and the print head 1 are fluidly and electrically connected. This makes it possible to supply ink and solvent to the print head 1, and to supply power from the controller 100 to the print head 1.

[0203] 6A, the first engagement portion 62 is located at the lower end of the head main body 1A. When the head module 1B is attached to the head main body 1A, the first engagement portion 62 engages with the second engagement portion 72 of the head module 1B. The term "engage" here may also be read as "fit."

[0204] Specifically, the first engagement portion 62 according to this embodiment has a convex shape that protrudes downward from the lower end of the first housing portion 60. More specifically, the first engagement portion 62 has a cylindrical shape that protrudes downward from the lower surface of the first housing portion 60.

[0205] A first fluid connection portion 62a and a first electrical connection portion 62b are located on the underside of the first engagement portion 62. The first fluid connection portion 62a is configured with a plurality of openings. Each of the plurality of openings is connected to an ink or fluid supply path (the ink supply pipe 44 or the solvent supply pipe 54). The first electrical connection portion 62b is configured with a terminal based on a predetermined standard. This terminal is electrically connected to the control unit 101 via a connection cable 107.

[0206] (Head module 1B) As shown in Figures 5A and 5B, the head module 1B is a component that can be attached to and detached from the head main body 1A. The head module 1B can be called the "tip portion" of the print head 1, or the "supported portion" that is supported by the head main body 1A. The head module 1B is connected to the connection cable 107 via the head main body 1A, and can also be called the "fluid supplied portion" to which ink or solvent is supplied from the connection cable 107 via the head main body 1A.

[0207] Specifically, the head module 1B according to this embodiment has a second housing portion 70 , a support plate portion 71 , and a second engagement portion 72 .

[0208] - Second housing portion 70 - The second housing portion 70, together with the first housing portion 60 of the head main body 1A, constitutes the housing 10 of the entire print head 1. The second housing portion 70 according to this embodiment has a shape that extends in the vertical direction, for example, a rectangular cylindrical shape. The second housing portion 70 is made of metal (aluminum die-cast), for example.

[0209] 3, the second housing 70 contains the nozzle 12, the charging electrode 13, the charge detection sensor 14, the deflection electrode 15, the gutter 16, the cleaning nozzle 17, the high voltage generator 18, the memory unit 19, the first magnet 23, and the second magnet 24.

[0210] 2B and 3, the high voltage generating unit 18 is located in the head module 1B, not in the head main body 1A. Regardless of the mounting state of the head main body 1A and the head module 1B, the electrical connection between the deflection electrode 15 and the high voltage generating unit 18 is maintained.

[0211] As described above, in this embodiment, the head module 1B is provided with the high voltage generating section 18 that generates the high voltage to be applied to the deflection electrode 15 .

[0212] Similarly, the head module 1B of this embodiment has a memory unit 19 that stores at least one of the following: information indicating the ink type, information regarding the lifespan of the inkjet recording device I, and correction information for adjusting the high voltage generated by the high voltage generating unit 18.

[0213] This storage unit 19 is located in the head module 1B, not in the head main body 1A. Regardless of the mounting state of the head main body 1A and the head module 1B, the storage unit 19 retains its stored contents.

[0214] 3, the first magnet 23 is located at the upper end of the head module 1B. When the head module 1B is attached to the head main body 1A, the first magnet 23 is positioned so as to be aligned with the first sensor 21 of the head main body 1A in the vertical direction.

[0215] 3, the second magnet 24 is located at the upper end of the head module 1B. When the head module 1B is attached to the head main body 1A, the second magnet 24 is positioned so as to be aligned with the second sensor 22 of the head main body 1A in the vertical direction.

[0216] As described above, when at least one of the first sensor 21 and the second sensor 22 is provided in the head module 1B, the magnet corresponding to that sensor is provided in the head main body 1A.

[0217] Support plate portion 71 The support plate portion 71 divides the internal space of the second housing portion 70. The support plate portion 71 according to this embodiment has a plate shape, for example, a rectangular plate shape, that extends in the up-down and left-right directions. The support plate portion 71 is made of, for example, resin.

[0218] 5B, the nozzles 12, the charging electrodes 13, the charge detection sensors 14, the deflection electrodes 15, and the gutter 16 are attached to the support plate portion 71. As a result, the nozzles 12, the charging electrodes 13, the charge detection sensors 14, the deflection electrodes 15, and the gutter 16 are fixed to the head module 1B.

[0219] 6B, the second engagement portion 72 is located at the lower end of the head module 1B. When the head module 1B is attached to the head main body 1A, the second engagement portion 72 engages with the first engagement portion 62 of the head main body 1A. The term "engage" here may also be read as "fit."

[0220] Specifically, the second engagement portion 72 according to this embodiment has a concave shape formed by recessing the upper end portion of the second housing portion 70. In more detail, the second engagement portion 72 recesses downward from the upper surface of the second housing portion 70 and forms an insertion hole having a circular cross section.

[0221] A second fluid connection portion 72a and a second electrical connection portion 72b are located on the bottom surface of the second engagement portion 72. The second fluid connection portion 72a is composed of a plurality of cylindrical bodies. Each of the cylindrical bodies is connected to the nozzle 12 and the cleaning nozzle 17. The second electrical connection portion 72b is composed of a terminal conforming to a predetermined standard. This terminal is electrically connected to the nozzle 12, charging electrode 13, charging detection sensor 14, gutter sensor 16b, high-voltage generator 18, and memory unit 19 via electrical wiring within the print head 1.

[0222] When the head module 1B is attached to the head main body 1A, the first fluid connection portion 62a and the second fluid connection portion 72a are fluidly connected, which makes it possible to supply ink and solvent to the head module 1B.

[0223] When the head module 1B is attached to the head main body 1A, the first electrical connection portion 62b and the second electrical connection portion 72b are electrically connected. This connection electrically connects the control unit 101 to the nozzle 12, the charging electrode 13, the charging detection sensor 14, the gutter sensor 16b, the high-voltage generation unit 18, and the memory unit 19, as shown in FIG. 2B .

[0224] <Specific Example of Attachment / Detachment Processing> The head main body 1A and the head module 1B are attached and detached during, for example, the manufacture of the print head 1. The attachment / detachment processing unit 101a according to this embodiment executes processing related to the attachment and detachment of the head main body 1A and the head module 1B.

[0225] 7 is a flowchart illustrating a removal sequence under normal conditions. The flowchart shown in Fig. 7 shows a control process executed by the attachment / detachment processing unit 101a when the operation display unit 103 receives an instruction to remove the head module 1B from the head main body 1A (hereinafter, also referred to as a "removal instruction").

[0226] 7, the attachment / detachment processing unit 101a writes various pieces of information to the storage unit 19. The information written in step SB1 includes at least one of the following: "module type," "ink type," "manufacturing serial number," "deflection voltage adjustment value," "deflection monitor adjustment value," and "character height adjustment value."

[0227] Here, "module type" is information indicating the type of head module 1B. This information is used to determine, for example, "whether standard size printing, small letter printing, high speed printing, L-shaped printing, etc. can be specified with the controller 100."

[0228] "Ink type" is information that indicates the type of ink used for printing. This information is used, for example, to determine whether the type of ink stored in the controller 100 matches the type of ink used.

[0229] "Manufacturing serial number" is information indicating the manufacturing serial number of the inkjet recording apparatus I. This information is used for traceability purposes, manufacturing and repair history management, and the like.

[0230] The "deflection voltage adjustment value" is correction information for adjusting the high voltage generated by the high voltage generating unit 18. This information is used to adjust individual differences so that the deflection voltage (high voltage applied to the deflection electrode 15) in the head module 1B becomes a specified value.

[0231] The "deflection monitor adjustment value" is correction information for adjusting the high voltage generated by the high voltage generation unit 18. This information is used to adjust for individual differences in the deflection voltage monitor circuit (not shown) in the head module 1B.

[0232] The "character height adjustment value" is information indicating the height of characters printed by the print head 1. This information is used to adjust the character height so that there is no difference between each head module 1B.

[0233] In the next step SB2, the control unit 101 cleans the inside of the print head 1 by ejecting a solvent from the nozzle 12, cleaning nozzle 17, etc. into the print head 1. The solvent used in this process is collected by a separate cleaning mount (not shown) on which the print head 1 is placed during cleaning.

[0234] In the next step SB3, the attachment / detachment processing unit 101a stops the supply of power from the controller 100 to the print head 1, thereby shutting down the electrical system of the print head 1. In this step SB3, at least the application of a pulse potential from the controller 100 to the charging electrode 13 is prohibited.

[0235] In the following step SB4, the attachment / detachment processing unit 101a stops the supply of ink and solvent from the controller 100 to the head module 1B, and shuts off the ink / solvent system of the head module 1B. In this step SB4, the attachment / detachment processing unit 101a inputs control signals to at least the fourteenth valve V14, the twelfth valve V12, and the fifteenth valve V15. The input of control signals causes these valves to transition from an open state to a closed state, or to be maintained in a closed state.

[0236] In the following step SB5, the attachment / detachment processing unit 101a displays a removal guide made up of still images, videos, messages, etc. on the display unit 103a. The removal guide shows the procedure for removing the head module 1B from the head main body 1A. The user can smoothly remove the head module 1B by following the removal guide displayed on the display unit 103a.

[0237] (Removal sequence in the event of an abnormality) Fig. 8 is a flowchart illustrating a removal sequence in the event of an abnormality. The flowchart shown in Fig. 8 shows a control process that is executed by the attachment / detachment processing unit 101a on the condition that the head module 1B is unintentionally removed from the head main body 1A without the operation display unit 103 receiving the removal instruction.

[0238] 7, the attachment / detachment processing unit 101a detects that the head module 1B has fallen off from the head main body 1A. This detection is performed based on a detection signal output from at least one of the first sensor 21 and the second sensor 22.

[0239] In the subsequent step SC2, the attachment / detachment processing unit 101a stops the supply of power from the controller 100 to the head module 1B, and cuts off the electrical system of the head module 1B. In this step SB3, at least the application of a pulse potential from the controller 100 to the charging electrode 13 is prohibited.

[0240] In the following step SC3, the attachment / detachment processing unit 101a displays an error notification such as a still image, a video, a message, etc. on the display unit 103a. The error notification in step SC3 is a notification indicating that the head module 1B has been unintentionally detached from the head main body 1A.

[0241] In the next step SC4, the control unit 101 recovers any ink or solvent (residual liquid) remaining in the print head 1. This recovery can be performed, for example, by the suction path 47 and the seventh ink tube 44g in FIG.

[0242] In the following step SC5, the attachment / detachment processing unit 101a stops the supply of ink and solvent from the controller 100 to the head module 1B, and shuts off the ink / solvent system of the head module 1B. In this step SC5, control signals are input from the attachment / detachment processing unit 101a to at least the fourteenth valve V14, the twelfth valve V12, and the fifteenth valve V15, causing these valves to transition from an open state to a closed state or to remain in a closed state.

[0243] (Mounting sequence) Fig. 9 is a flowchart illustrating the mounting sequence (attachment sequence) of the head module 1B. The flowchart shown in Fig. 9 shows a control process that is executed by the mounting / detachment processing unit 101a when the head module 1B is mounted (attached) to the head main body 1A. Note that, to simplify the drawing, the "head module" is simply referred to as "module" in Fig. 9.

[0244] 9, the attachment / detachment processing unit 101a detects that the head module 1B is attached to the head main body 1A. This detection is performed based on a detection signal output from at least one of the first sensor 21 and the second sensor 22.

[0245] In the following step SD2, the attachment / detachment processing unit 101a resumes the power supply to the head module 1B from the controller 100. In this step SD2, a pulse potential is applied from the controller 100 to at least the charging electrode 13.

[0246] In the next step SD3, the attachment / detachment processing unit 101a reads information from the storage unit 19. The information read in step SD3 includes, for example, the "number of attachments / detachments."

[0247] Here, the "number of attachments and detachments" is information relating to the lifespan of the inkjet recording apparatus I. Specifically, this information indicates the number of times the head module 1B has been attached to and detached from the head main body 1A.

[0248] In the next step SD4, the attachment / detachment processing unit 101a determines whether the information read in step SD3 is normal. This determination can be made, for example, based on whether the number of attachments / detachments exceeds a predetermined reference value.

[0249] If the determination in step D4 is NO, that is, if it is determined that the information contains some kind of abnormality, the attachment / detachment processing unit 101a advances the control process to step SD6. In this case, the attachment / detachment processing unit 101a issues a warning depending on the abnormality, such as that the print head 1 is reaching the end of its life. This warning can be issued, for example, by displaying a message on the display unit 103a.

[0250] On the other hand, if the determination in step D4 is YES, the attachment / detachment processing unit 101a sets various parameters relating to the print head 1, such as the pulse potential applied to the charging electrode 13, to predetermined values.

[0251] <Regarding Improvements in Manufacturing Efficiency in This Embodiment> In the case of a typical continuous inkjet recording device, the print head contains nozzles, charging electrodes, deflection electrodes, and gutters. Therefore, the connection cable connecting the controller and print head is made up of multiple conduits and electrical wiring, such as a supply pipe for supplying ink, a recovery pipe for recovering ink, and electrical wiring for applying predetermined voltages to the charging electrodes and deflection electrodes.

[0252] Furthermore, when a known connection cable is used, the inkjet recording device has a so-called integrated configuration in which the print head and the controller are connected via the connection cable.

[0253] Generally, when manufacturing a print head, an installation process is required to install and adhere charging electrodes, deflection electrodes, etc., inside the print head. After the installation process is complete, the print head must be dried in a high-temperature chamber. Various tests may also be performed in parallel with or before or after the drying process. One such test may be an inspection of the operation of the nozzles installed inside the print head.

[0254] However, when the above-mentioned integrated configuration is used, the existence of such work and inspections becomes an obstacle to improving the productivity of the inkjet recording apparatus.

[0255] For example, during the drying process, not only the print head but also the controller must be placed in a high-temperature room, which requires a lot of time and effort, such as securing space for the controller and transporting it in, and ultimately hinders productivity improvements.

[0256] Furthermore, if an abnormality is found in various print head inspections, even if there is no problem with the controller, the inkjet recording device as a whole cannot be completed as a product until the print head abnormality is resolved, which again hinders productivity improvement.

[0257] The problem to be solved by the above embodiment is to improve the manufacturing efficiency of inkjet recording devices, and ultimately their productivity. To address this problem, according to this embodiment, a portion of the print head 1 is modularized as a head module 1B that is detachable from the head main body 1A. As shown in Figure 3, this head module 1B houses nozzles 12, charging electrodes 13, and deflection electrodes 15, and also incorporates a high-voltage generator 18 for generating a high voltage (e.g., several kV) for the deflection electrodes 15.

[0258] By incorporating the high voltage generating unit 18 into the head module 1B, high voltage signals resulting from the high voltage generating unit 18 are not transmitted between the head main body 1A and the head module 1B. This makes it possible to shorten the insulation distance and simplify and compact the connection portion between the head main body 1A and the head module 1B, i.e., the first and second engaging portions 62, 72.

[0259] By using such a head module 1B, during the manufacture of the inkjet recording device, it is possible to remove the head module 1B from the head main body 1A and dry it, and if an abnormality is found during inspection of the head module 1B, it can be replaced with another head module 1B that is not defective, thereby completing the product. As a result, the manufacturing efficiency of the inkjet recording device I can be improved, and ultimately productivity can be improved.

[0260] Furthermore, by placing the 14th valve V14 inside the head main body 1A, it is possible to prevent ink from leaking from the head main body 1A when the head module 1B is removed from the head main body 1A during the manufacture of the inkjet recording device I.

[0261] In general, ink leakage pollutes the surrounding environment of the factory, and cleaning up the polluted environment is time-consuming. Considering the time and effort required, ink leakage is inconvenient for improving the manufacturing efficiency of the inkjet recording apparatus I.

[0262] In response to this, by suppressing ink leakage as described above, the productivity of the inkjet recording apparatus I can be improved.

[0263] Furthermore, by prohibiting the application of a high voltage signal to the charging electrode 13 when removing the head module 1B, it is possible to prevent the user from getting an electric shock without turning off the power to the controller 100. Therefore, the head module 1B can be safely removed even when it is in an active state. This allows various manufacturing processes to proceed efficiently, and improves the productivity of the inkjet recording apparatus I.

[0264] 3, by providing a memory unit 19 in the head module 1B, it becomes possible to read information from the head module 1B alone without moving the print head 1, and therefore the entire inkjet recording apparatus I. As a result, various inspections can be carried out efficiently, and the productivity of the inkjet recording apparatus I can be improved.

[0265] As shown in FIG. 2B, the print head 1 is provided with a first sensor 21 and a second sensor 22, and at least a portion of the electrical paths between the first sensor 21 and the second sensor 22 are independent.

[0266] By doing this, even if a problem occurs in one of the independent electrical paths, the detection signal of the first sensor 21 or the second sensor 22 can be input to the controller 100 through the other electrical path.

[0267] 18, by connecting the mounting portion 91 to the head main body 1A, it is possible to alleviate the stress acting on the connection portion between the head main body 1A and the head module 1B, in particular the stress received from the connection cable 107. This makes it possible to stabilize the positioning of the print head 1.

[0268] <First Modification of Inkjet Recording System S> Figure 10A is a diagram corresponding to Figure 5A illustrating the configuration of a head main body 1A and a head module 1B according to a first modification. Figure 10B is a diagram corresponding to Figure 5B illustrating the print head 1 according to the first modification after assembly.

[0269] 11A is a perspective view illustrating the first and second locking mechanisms 80 and 90, and FIG. 11B is a perspective view illustrating the first and second locking mechanisms 80 and 90. FIG. 12 is a side view illustrating the operation of the first and second locking mechanisms 80 and 90.

[0270] 10A, 10B, 11A, 11B, and 12, elements having the same configurations and structures as those in the previous embodiment are denoted by the same reference numerals as those in the previous embodiment.

[0271] The print head 1 according to the first modification includes a head main body 1A and a head module 1B configured in the same manner as in the above embodiment, as well as a first locking mechanism 9A for locking the head module 1B to the head main body 1A. The first locking mechanism 9A prevents the head module 1B from falling off the head main body 1A.

[0272] Furthermore, the print head 1 according to the first modification is equipped with a second locking mechanism 9B that further locks the first locking mechanism 9A. The print head 1 according to the first modification can be said to be a print head with a double locking structure. The second locking mechanism 9B further restricts the release of the restriction provided by the first locking mechanism 9A.

[0273] The following describes in detail the configuration related to the first locking mechanism 9A and the second locking mechanism 9B. As shown in Figures 10A and 10B, the print head 1 according to the first modification includes an arm member 81, a first locking portion 82, and a second locking portion 83.

[0274] The arm member 81 is rotatably supported by the head main body 1 A. More specifically, the arm member 81 is attached to protrusions 81 a protruding from both the left and right side surfaces of the first housing 60, and rotates around a rotation axis extending in the left-right direction, centered on the protrusions 81 a.

[0275] 10A, the arm member 81 is composed of a first member 81b extending in an arm-like manner from each of the left and right protrusions 81a, and a second member 81c extending in the left-right direction so as to connect the tips of the two first members 81b. The first member 81b pivots relative to the protrusion 81a, centering on the protrusion 81a. The second member 81c pivots integrally with the first member 81b.

[0276] 10B and 11A, the other end of the first member 81b is provided with a recessed portion 81d that is recessed to receive the first locking portion 82. As shown in Fig. 11B, this first locking portion 82 protrudes from both the left and right side surfaces of the second housing portion 70. Note that the "other end of the first member 81b" here refers to the end of the first member 81b that is located on the opposite side of the second member 81c with respect to the protruding portion 81a.

[0277] The first locking mechanism 9A is made up of an arm member 81 and a first locking portion 82. That is, as shown in the upper and lower parts of Figure 12, when assembling the print head 1, the worker first inserts the second engaging portion 72 of the head module 1B into the first engaging portion 62 of the head main body 1A, and then brings the head main body 1A and the head module 1B into close contact with each other.

[0278] In this state, the arm member 81 is rotated around the protrusion 81a, and the first locking portion 82 is fitted into the recess 81d, thereby preventing the head module 1B from falling off from the head main body 1A.

[0279] The second locking part 83 is rotatably supported by the head main body 1 A. Specifically, the second locking part 83 is attached to the front surface of the first housing part 60, and rotates around a rotation axis extending in the front-to-rear direction, with the center of the second locking part 83 as the rotation axis.

[0280] As shown in Figures 10A and 10B, by rotating the second locking portion 83 by 180 degrees, the state switches between a state in which displacement of the second member 81c relative to the first housing portion 60 is permitted (see Figure 10A) and a state in which displacement of the second member 81c relative to the first housing portion 60 is restricted (see Figure 10B).

[0281] The second locking mechanism 9B is composed of an arm member 81 and a second locking portion 83. That is, as shown in Fig. 10B and the lower part of Fig. 12, in a state in which the first locking mechanism 9A prevents the head module 1B from falling off the head main body 1A, the operator rotates the second locking portion 83. This restricts displacement of the second member 81c relative to the first housing portion 60. As a result, release of the restriction by the first locking mechanism 9A is further restricted.

[0282] Additionally, the inkjet recording apparatus I according to the first modification additionally performs processing related to the first and second locking mechanisms 9A and 9B. Specifically, the attachment / detachment processing unit 101a according to the first modification determines whether or not the restriction by the second locking mechanism 9B has been released based on the rotation state of the second locking unit 83. Then, when it is determined that the restriction by the second locking mechanism 9B has been released, the attachment / detachment processing unit 101a executes a predetermined processing.

[0283] The processing specific to the first modified example will be described below. Fig. 13 is a diagram corresponding to Fig. 8 illustrating a removal sequence according to the first modified example. Fig. 14 is a diagram corresponding to Fig. 9 illustrating a mounting sequence according to the first modified example.

[0284] First, the removal sequence illustrated in FIG. 7 is common to the above embodiment and the first modified example, but when processing step SB5 in FIG. 7, a display related to the first and second locking mechanisms 9A, 9B is displayed.

[0285] Specifically, the inkjet recording apparatus I according to the first modified example displays a screen 300A, as shown in Fig. 15, on the display unit 103a during the processing of step SB5 in Fig. 7. This screen 300A displays the operation procedures that should be performed before replacing (removing) the head module 1B, buttons 301 and 302 that should be pressed during the operation procedures, and an image 304 showing the appearance of the print head 1. The operator can proceed with the replacement (removal) of the head module 1B by following the contents of the screen 300A.

[0286] The processes of steps SE2 to SE5 in Fig. 13 are substantially the same as the processes of steps SC2 to SC5 in Fig. 8. The control process in Fig. 13 differs from step SC1 in Fig. 8 in the content of step SE1.

[0287] Specifically, in step SE1, the attachment / detachment processing unit 101a determines whether the restriction by the second locking mechanism 9B has been released based on the rotational state of the second locking unit 83. If the attachment / detachment processing unit 101a determines that the restriction by the second locking mechanism 9B has been released, the control process proceeds to step SE2.

[0288] In step SE2, the attachment / detachment processing unit 101a stops the supply of power from the controller 100 to the head module 1B, and cuts off the electrical system of the head module 1B. In step SB3, at least the application of a pulse potential from the controller 100 to the charging electrode 13 is prohibited. At the stage where the restriction by the second locking mechanism 9B is released, the restriction by the first locking mechanism 9A is still in effect. By advancing the control process to step SE2 at this stage, it is possible to achieve processing that is on the safer side.

[0289] The processes of steps SF1 to SF6 in Fig. 14 are substantially the same as the processes of steps SD1 to SD6 in Fig. 9. The control process in Fig. 14 differs from the control process in Fig. 8 in that the processes of steps SG1 and SG2 are included.

[0290] First, in step SG1, the attachment / detachment processing unit 101a displays, on the display unit 103a, an attachment guide made up of still images, videos, messages, etc. The attachment guide indicates the procedure for attaching the head module 1B to the head main body 1A.

[0291] Specifically, the inkjet recording apparatus I according to the first modified example displays a screen 300B, as shown in Fig. 16, on the display unit 103a during the processing of step SG1 in Fig. 14. This screen 300B displays the operation procedures to be performed when replacing (attaching) the head module 1B, buttons 305 to be pressed during the operation procedures, and an image 306 showing the appearance of the print head 1 and the movement of the first and second locking mechanisms 9A, 9B. The operator can proceed with the replacement (attachment) of the head module 1B by following the contents of the screen 300A.

[0292] In the following step SG2, the attachment / detachment processing unit 101a determines whether or not the restriction by the second locking mechanism 9B has been set based on the rotational state of the second locking unit 83. If the attachment / detachment processing unit 101a determines that the restriction by the second locking mechanism 9B has been set, the control process proceeds to step SF1. The processing from this point onwards is as described using FIG. 9.

[0293] That is, as shown in step SF2, the attachment / detachment processing unit 101a resumes the power supply from the controller 100 to the head module 1B on the condition that the restriction by the second lock mechanism 9B has been set. In this step SF2, a pulse potential is applied from the controller 100 to at least the charging electrode 13. In this way, by setting the condition for resuming the power supply not only as a detection result based on the first and second sensors 21 and 22 but also as a condition that the restriction by the second lock mechanism 9B has been set, it is possible to realize processing that is on the safer side.

[0294] <Significance of the First Modification> In the case of a typical continuous inkjet recording device, the print head contains nozzles, charging electrodes, deflection electrodes, and gutters. Therefore, the connection cable connecting the controller and print head is made up of multiple conduits and electrical wiring, such as a supply pipe for supplying ink, a recovery pipe for recovering ink, and electrical wiring for applying a predetermined voltage to the charging electrodes and deflection electrodes.

[0295] Furthermore, when a known connection cable is used, the inkjet recording device has a so-called integrated configuration in which the print head and the controller are connected via the connection cable.

[0296] At this point, the printhead may become clogged with ink in the nozzles or the charging and / or deflection electrodes may fail, resulting in the printhead needing repair.

[0297] However, when an integrated configuration such as that described above is used, the print head and controller are integrated into one unit, so it is necessary to send both the print head and the controller to the manufacturer, repair shop, etc. for repair, or to have a maintenance person visit the installation site of the inkjet recording device to perform the repair.

[0298] However, since it takes a long time for the production line (corresponding to the conveying line L in this specification) to recover, there is a risk that the operating rate of the production line will decrease.

[0299] For example, if both the print head and controller are mailed for repair, the waste fluid disposal, packaging, delivery, and other tasks are time-consuming. Even if a maintenance technician is dispatched to your location, it can take a long time to resolve the problem. For example, if there is a deflection leak in the deflection electrode, the electrode must be properly cleaned with a solvent. Furthermore, if a nozzle is clogged, a replacement nozzle must be installed on the print head, and then the axis must be properly adjusted while taking into account the individual differences between the parts. These tasks can take a lot of time. Furthermore, it is often impossible to identify the cause of the problem in the first place.

[0300] The problem to be solved by the first modified example is to prevent a decrease in the operating rate of the production line even if a problem occurs with the print head. To address this problem, according to the first modified example, part of the print head 1 is modularized as a head module 1B that is detachable from the head main body 1A. As shown in Figure 3, this head module 1B houses the nozzles 12, charging electrodes 13, and deflection electrodes 15, and also incorporates a high-voltage generator 18 for generating a high voltage (e.g., several kV) for the deflection electrodes 15.

[0301] By modularizing part of the print head 1, even if a problem occurs with the print head 1 while the production line (transport line L) is in operation, the production line can be restarted simply by replacing the head module 1B with a new one, thereby shortening the time required to recover from the problem and preventing a decline in the operating efficiency of the production line.

[0302] Also, as in the above embodiment, by incorporating the high-voltage generating unit 18 into the head module 1B, high-voltage signals resulting from the high-voltage generating unit 18 are not transmitted or received between the head main body 1A and the head module 1B. This makes it possible to shorten the insulation distance and simplify and compact the connection portions between the head main body 1A and the head module 1B, i.e., the first and second engaging portions 62, 72. This simplification and compactness makes it easier to attach and detach the head module 1B, improving its usability.

[0303] Furthermore, by placing the 14th valve V14 inside the head main body 1A, it is possible to prevent ink from leaking from the head main body 1A when the head module 1B is removed from the head main body 1A during the manufacture of the inkjet recording device I.

[0304] In general, ink leakage pollutes the surrounding environment of a factory, requiring a lot of effort to clean up. Considering the effort required, ink leakage is inconvenient in terms of ensuring the operating efficiency of a production line.

[0305] In response to this, by arranging the fourteenth valve V14 inside the head main body 1A, ink leakage can be suppressed, thereby preventing a decrease in the operating efficiency of the production line.

[0306] Furthermore, as explained with reference to Figure 2B in the above embodiment, the print head 1 is provided with a first sensor 21 and a second sensor 22, and at least some of the electrical paths between the first sensor 21 and the second sensor 22 are independent.

[0307] By doing so, even if a problem occurs in one of the independent electrical paths, the detection signal of the first sensor 21 or the second sensor 22 can be input to the controller 100 via the other electrical path, which makes it easy to replace the head module 1B.

[0308] 10A and other figures, providing not only the first locking mechanism 9A but also the second locking mechanism 9B can prevent the ink cartridge from accidentally falling off due to human error. This prevents ink from leaking due to the ink cartridge being accidentally dropped off, which is advantageous in ensuring the operating efficiency of the production line.

[0309] <Second Modification of Inkjet Recording System S> Fig. 17 is a view corresponding to Fig. 3 illustrating a print head 1 according to a second modification. Fig. 19 is a view corresponding to Fig. 18 illustrating an attachment portion 92 in the second modification.

[0310] In the second modified example, the connection cable 107 is provided with a valve (fourteenth valve V14) that opens and closes the ink supply path to the nozzle 12. Similarly, the head main body 1A is provided with a valve (twelfth valve V12) that opens and closes the solvent supply path to the nozzle 12. As in this second modified example, at least one of the fourteenth valve V14 and the twelfth valve V12 may be built into the connection cable 107.

[0311] 19, in this second modified example as well, the connection cable 107, head main body 1A, and head module 1B are connected in this order from top to bottom. Here, an attachment part 92 that positions and fixes the print head 1 is connected to the head module 1B in the second modified example. The print head 1 is connected to the support member 2 via the attachment part 92. More specifically, in this embodiment, the attachment part 92, which extends in the vertical direction, is connected to the rear surface of the head module 1B (the rear surface of the second housing part 70 described above).

[0312] In this way, by connecting the attachment part 92 to the head module 1B located at the tip side of the print head 1, it is possible to stabilize the landing position of the ink ejected from the head module 1B, thereby stabilizing the printing accuracy of the print head 1.

[0313] <Third Modification of Inkjet Recording System S> Figure 20 is a diagram corresponding to Figure 3 illustrating a print head 1 according to a third modification. Figure 21 is a diagram corresponding to Figure 4 illustrating an inkjet recording apparatus I according to the third modification. Components having substantially the same functions are denoted by the same reference numerals between Figures 3 and 4 and Figures 20 and 21.

[0314] In the above embodiment, the 14th valve V14 that opens and closes the ink supply path to the nozzle 12 was given as an example of a "valve" that is provided on the connection cable 107 or the head main body 1A and that opens and closes the circulation path that allows ink to circulate between the head main body 1A and the head module 1B.

[0315] However, the "valve" according to the present disclosure is not limited to a valve that opens and closes an ink supply path to the nozzle 12. The "valve" according to the present disclosure includes valves that open and close a distribution path for recovering ink or solvent between the head main body 1A and the head module 1B, such as the sixth valve V6 that opens and closes the suction path 47 and the tenth valve V10 that opens and closes the seventh ink tube 44g (see FIG. 20). This makes it possible to deal with ink leakage from the suction path 47 or the seventh ink tube 44g.

[0316] Here, of the sixth valve V6 and the fourteenth valve V14, the components corresponding to the "valve" are built into the head main body 1A, as shown in Figures 20 and 21. Alternatively, at least one of the sixth valve V6 and the fourteenth valve V14 may be built into the connection cable 107, as in the second modified example described above.

[0317] The "valve" may be a "valve" that opens and closes a circulation path for supplying ink or solvent between the head main body 1A and the head module 1B, or for recovering ink or solvent, i.e., a circulation path for circulating ink or solvent between the two.

[0318] Here, the term "valve" is used in a broad sense. In other words, the "valve" in the present disclosure includes fluid couplings in addition to valve-like components such as solenoid valves and manual cocks. A specific example of a fluid coupling is the Zero Spill Coupler (registered trademark). Generally, zero spill couplers employ a drip-reducing valve structure, which reduces air intrusion and dripping during connection and disconnection. Furthermore, zero spill couplers can be connected with a single touch, simplifying operation and improving work efficiency. Other examples include ball valves, butterfly valves, and pressure reducing valves.

[0319] <Other Modifications> Additionally, when the inkjet recording apparatus I is shut down (for example, when the ink circulation is stopped), various information may be stored in the storage unit 19. The information stored at that time includes at least one of "total power-on time," "total start-up time," "error history," and "final shut-down state."

[0320] Here, the "total power-on time" is the total power-on time stored in the controller 100, and is information that is copied to the memory unit 19 during the shutdown operation.

[0321] "Total start-up time" is the total start-up time stored in the controller 100, and is information that is copied to the storage unit 19 during the shutdown operation.

[0322] "Error history" is information that associates the date and time an error occurred with an ID number that indicates the type of error.

[0323] The "final shutdown status" is information indicating whether the system was operating normally at the final shutdown or whether it was in an error state at the final shutdown.

[0324] S Inkjet recording system I Inkjet recording device 1 Print head 1A Head main body 1B Head module 10 Housing 10a Discharge port 12 Nozzle 13 Charging electrode 15 Deflection electrode 151 First electrode plate 152 Second electrode plate 16 Gutter 17 Cleaning nozzle 18 High voltage generating unit 19 Memory unit 21 First sensor (sensor) 22 Second sensor 9A First locking mechanism 9B Second locking mechanism 100 Controller 101 Control unit 101a Attachment / detachment processing unit 104 Ink supply unit 105 Solvent supply unit 107 Connection cable (cable) V6 Sixth valve (valve) V10 Tenth valve (valve) V14 Fourteenth valve (valve) W Printing object

Claims

1. A continuous type inkjet recording device comprising: a print head which houses therein a nozzle for ejecting particulate ink, a charging electrode for charging the particulate ink ejected from the nozzle, a deflection electrode for deflecting the flight direction of the ink charged by the charging electrode, and a gutter for collecting ink that has been undeflected by the deflection electrode, and which ejects the ink deflected by the deflection electrode to the outside; a controller having an ink supply unit which supplies ink to the print head and a control unit which controls the supply of ink from the ink supply unit to the print head; and a cable which connects the print head and the controller and supplies ink from the controller to the print head, wherein the print head has: a head main body to which the cable is connected and which supplies ink to the nozzle via the cable; and a head module which is detachable from the head main body and which houses the nozzle, the charging electrode, the deflection electrode, and the gutter, An inkjet recording device characterized in that the cable or the head body is provided with a valve for opening and closing a circulation path for circulating ink or solvent between the cable and the head module, and the head module is provided with a high voltage generating unit for generating a high voltage to be applied to the deflection electrode.

2. An inkjet recording device as described in claim 1, characterized in that the valve transitions from an open state to a closed state upon receiving a control signal from the control unit when the head module is removed from the head body.

3. An inkjet recording apparatus according to claim 1 or 2, characterized in that the head body or the head module has a sensor that detects that the head module has been removed from the head body.

4. An inkjet recording device as described in claim 3, characterized in that the control unit prohibits application of a high voltage signal to the charging electrode on the condition that the head module is detached from the head body.

5. An inkjet recording device as described in claim 1, characterized in that the head module has a memory unit that stores at least one of information indicating the type of ink, information regarding the lifespan of the inkjet recording device, and correction information for adjusting the high voltage generated by the high voltage generating unit.

6. An inkjet recording device as described in claim 1, characterized in that the print head has a first locking mechanism that prevents the head module from falling off the head body, and a second locking mechanism that further prevents the release of the restriction imposed by the first locking mechanism.

7. An ink jet recording device according to claim 1, further comprising a mounting portion connected to said head body for positioning and fixing said print head.

8. An inkjet recording apparatus according to claim 1, further comprising a mounting portion connected to said head module for positioning and fixing said print head.

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