Inkjet recording device and recording device

Abstract

To reduce an amount of solvent steam floating in a periphery when cleaning a print head, in an inkjet recording device, and further, to reduce ink contamination in the periphery of a print head.SOLUTION: An inkjet recording device includes a main body part and a print head. The main body part includes: an ink container for storing ink; and a solvent container for storing a solvent. The print head includes: a nozzle which is connected to the ink container to discharge pressurized and fed ink; a charge electrode for charging ink particles discharged from the nozzle; a deflection electrode for deflecting the ink particles charged by the charge electrode; and a gutter for recovering ink. Further, a head mounting unit for cleaning the print head is included in the inkjet recording device. The head mounting unit is connected to a solvent steam suction path for suctioning the solvent steam generated in the periphery.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an inkjet recording apparatus. [Background technology]

[0002] Patent Document 1 (JP 2020-49786 A) is known as a technology related to this technical field. Patent Document 1 discloses "an inkjet recording device including an ink container that stores ink for printing on a print target, a nozzle connected to the ink container and ejecting pressurized ink, a charging electrode that charges ink droplets ejected from the nozzle, a deflection electrode that deflects ink droplets charged by the charging electrode, a gutter that collects ink not used for printing, a solvent container that stores solvent, and a liquid nozzle connected to the solvent container and ejecting pressurized solvent, wherein the liquid nozzle has a liquid flow path portion that extends from the nozzle toward the gutter and a liquid ejection hole portion that is angled so that the pressurized solvent hits the nozzle via the liquid flow path portion."

[0003] Also known is the technology of Patent Document 2 (JP 2019-123117 A). Patent Document 2 discloses "an inkjet recording apparatus including an ink container that stores ink for printing on a print target, a nozzle connected to the ink container and ejecting pressurized ink, a charging electrode that charges ink particles ejected from the nozzle, a charging signal generating unit that generates a charging signal to charge the charging electrode, a deflection electrode that deflects ink particles charged by the charging electrode, a gutter that collects ink not used for printing, and a control unit that controls the overall operation, wherein the inkjet recording apparatus further includes a first charge detecting unit that detects the amount of charge of the ink particles between the charging electrode and the deflection electrode, and a second charge detecting unit that detects the amount of charge of ink flowing in the gutter." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-49786 [Patent Document 2] Japanese Patent Application Publication No. 2019-123117 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 describes the configuration and control method of an inkjet recording device that ejects a solvent from a liquid nozzle onto a print head set in a head cleaning unit to clean ink stains from the print head (head cleaning step), and then ejects air from an air nozzle to dry the solvent adhering to the print head (head drying step). Here, during the head drying step, the solvent (liquid) changes into solvent vapor (gas), and there is a possibility that the solvent vapor will drift around the print head.

[0006] Furthermore, Patent Document 2 describes the configuration and control method of an inkjet recording device for detecting an abnormality (commonly referred to as beam bending) in which ink droplets ejected from the nozzles of a print head cannot be captured by a gutter. Such an abnormality (beam bending) can occur immediately after ink starts to be ejected from the nozzles. If an abnormality (beam bending) occurs, there is a possibility that the area around the print head will be soiled with ink.

[0007] Therefore, an object of the present invention is to reduce the amount of solvent vapor floating around the print head when cleaning the print head. Another object of the present invention is to reduce ink stains around the print head caused by abnormalities that occur when ink jetting starts. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides, as one example, an inkjet recording apparatus comprising: a main body having a print head for printing, a path for supplying ink from an ink container to the print head, a path for recovering the ink not used for printing back into the ink, a path for supplying solvent from a solvent container to the ink container, and an adjustment unit for adjusting the flow of the ink and the solvent in each path; a control unit for controlling the main body and the print head; a cleaning tank having a space large enough to accommodate the print head and an opening at the bottom, and a head mounting unit having a recovery container for recovering liquid that flows out from the opening; and the inkjet recording apparatus also having a solvent vapor suction path connected to the cleaning tank for sucking in and discharging solvent vapor generated in the cleaning tank, and a drive unit for discharging the solvent vapor.

[0009] Another example of the present invention is a print head having nozzles that atomize input ink and eject the ink, a charging electrode that charges the ink particles ejected from the nozzles, a deflection electrode that deflects the ink particles charged by the charging electrode, and a gutter that recovers unused ink that is not used for printing; a main body that includes an ink supply path for supplying the ink in an ink container to the nozzles, an ink recovery path for recovering the unused ink recovered by the gutter into the ink, a solvent supply path for supplying solvent in a solvent container, and an adjustment unit that adjusts the flow of the ink and the solvent in each path; and an inkjet recording device comprising: a control unit that controls the print head; a cleaning tank having a space capable of accommodating the print head; a cleaning nozzle that ejects the solvent toward the print head accommodated in the cleaning tank; and a head mounting unit having an air outlet that ejects air into the cleaning tank to dry the print head; the inkjet recording device is provided with a charge sensor that detects the amount of charge of the ink particles charged by the charging electrode; and the control unit ejects the solvent from the cleaning nozzle to clean the print head, and then detects whether there is a reaction in the charge sensor while applying a voltage to the deflection electrode.

[0010] Another example of the present invention is an inkjet recording apparatus comprising: a print head having a nozzle that atomizes input ink and ejects it, a charging electrode that charges the ink particles ejected from the nozzle, a deflection electrode that deflects the ink particles charged by the charging electrode, and a gutter that collects unused ink not used for printing; a main body that has an ink supply path for supplying the ink in an ink container to the nozzle, an ink recovery path for recovering the unused ink recovered by the gutter back to the ink container, a solvent supply path for supplying solvent in a solvent container, and an adjustment unit that adjusts the flow of the ink and the solvent in each path; a control unit that controls the main body and the print head; and a head mounting unit that can accommodate the print head, wherein the control unit begins ejecting ink particles from the nozzle after confirming that the print head is mounted on the head mounting unit. [Effects of the Invention]

[0011] According to the present invention, when cleaning the print head, it is possible to reduce the amount of solvent vapor emitted around the print head, and to reduce the odor of the solvent vapor when cleaning the print head. Furthermore, according to the present invention, by starting ink ejection from the nozzles while the print head is attached to the head mounting unit, it is possible to reduce contamination of the area around the print head by ink. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing a usage state of an inkjet recording apparatus according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram showing a path configuration of the inkjet recording apparatus according to the first embodiment. [Figure 3] FIG. 2 is a diagram illustrating the configuration of a control unit of the inkjet recording apparatus according to the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view showing the configuration of a head mounting unit in the first embodiment. [Figure 5]FIG. 10 is a diagram showing a state in which the collection container is removed from the head mounting unit. [Figure 6] FIG. 2 is a diagram showing a state in which a print head is mounted in the head mounting unit. [Figure 7] 1 is a fluid path diagram showing, by bold lines, the flow of liquid and the flow of gas throughout the device when a head cleaning process is being performed in Example 1. FIG. [Figure 8] 4 is a cross-sectional view of the head mounting unit, showing the flow of liquid and the flow of gas inside the head mounting unit by thick lines when a head cleaning process is being performed in Example 1. FIG. [Figure 9] FIG. 2 is a flow path diagram showing, by bold lines, the flow of gas throughout the device when a head drying process is being performed in Example 1. [Figure 10] 4 is a cross-sectional view of the head mounting unit, showing the flow of liquid and the flow of gas inside the head mounting unit by thick lines when a head drying process is being performed in Example 1. FIG. [Figure 11] 10 is a cross-sectional view of the head mounting unit showing a state in which a large amount of cleaning liquid is contained in the collection container of the first embodiment. FIG. [Figure 12] 10 shows a head cleaning mode selection screen in the first embodiment. [Figure 13] FIG. 4 is a flowchart of a head cleaning process in the first embodiment. [Figure 14] 10A and 10B are diagrams illustrating a method for determining ink contamination during a head cleaning process and a method for determining a dry state during a head drying process in the second embodiment. [Figure 15] FIG. 10 is a flowchart of a head cleaning process in the second embodiment. [Figure 16] FIG. 11 is a flowchart of an operation shutdown process in the third embodiment. [Figure 17] 10 is a time chart showing the phase relationship between an excitation signal and a phase search charging voltage in the fourth embodiment. [Figure 18] FIG. 10 is a diagram showing a method for determining whether or not an abnormality exists at the start of operation in the fourth embodiment. [Figure 19] 13 shows an operation start mode selection screen in the fourth embodiment. [Figure 20]FIG. 10 is a flowchart of an operation start process in the fourth embodiment. [Figure 21] FIG. 13 is a fluid path diagram showing the flow of liquid by thick lines when ink is circulating inside the main body in Example 5. [Figure 22] FIG. 10 is a fluid path diagram showing, by bold lines, the flow of liquid and the flow of gas when ink is circulating in the main body and the print head in Example 5. [Figure 23] FIG. 13 is a diagram showing, by a thick line, the flow of ink when nozzle cleaning and circulation path cleaning are performed in Example 5. [Figure 24] 13 shows a long-term shutdown setting screen in the fifth embodiment. [Figure 25] FIG. 10 is a flowchart of ink circulation during a long-term shutdown in the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Specific embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments described below. In addition, in the following drawings, the same devices are given the same numbers (reference symbols), and descriptions of devices that have already been described may be omitted.

[0014] Example 1

[0015] <Usage status> First, the usage state of the inkjet recording apparatus in the first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a perspective view showing the usage state of the inkjet recording apparatus in the first embodiment of the present invention.

[0016] In FIG. 1, inkjet recording devices 600A and 600B each include a main body 1, a print head 2 connected to the main body 1 via a cable (for the print head) 5, and a head mounting unit 3 connected to the main body 1 via a cable (for the head mounting unit) 6. The head mounting unit 3 basically houses the print head, but may also have the added function of spraying cleaning fluid to clean the print head. The head mounting unit 3 described below is configured to have the additional function of cleaning the print head. Inkjet recording device 600A shows the print head 2 installed on the production line. Inkjet recording device 600B shows the print head 2 removed from the production line and mounted (set) in the head mounting unit 3. A collection container 4 attached to the bottom of the head mounting unit 3 is provided to collect the liquid (cleaning fluid) used to clean the print head after the head mounting unit 3 has been used to clean the print head.

[0017] Inkjet recording device 600A is installed on a production line in a factory where foods, beverages, etc. are produced, and main body 1 is installed in a location where there is enough space for regular maintenance work, etc. Print head 2 is fixed to print head fixing bracket 13 installed near belt conveyor 11 and installed in close proximity to print targets 12A and 12B fed in the direction of arrow X on the production line such as belt conveyor 11. In addition, protective cover 17 is attached to print head 2 to protect the internal components of print head 2. Note that print target 12B is shown in a state where printing by print head 2 has finished and it is being transported on belt conveyor 11.

[0018] In FIG. 1, main body 1 contains (holds) ink for printing and controls the drive unit (pump and solenoid valve) inside the main body to supply ink to print head 2 via cable (for print head) 5. The internal routing configuration of main body 1 and details of the control unit will be described later. Operation display unit 8 is installed on the top surface of main body 1, and in this case uses a touch input display panel. By touching operation display unit 8, the operator can instruct the control unit to start or stop the device and set the content to be printed on print target 12A. In FIG. 1, 16 in print head 2 denotes a head base, and 17 denotes a protective cover.

[0019] The head mounting unit 3 is installed near the print head 2. The head mounting unit 3 in the inkjet recording apparatus 600A is fixed by combining a fixing jig 92 attached to the belt conveyor 11 with a mating part 93 attached to the head mounting unit 3. The head mounting unit 3 has a head mounting part 81A for mounting the print head 2 to the head mounting unit. The head mounting unit 3 also has a start button 18 for starting the cleaning process of the print head 2, a stop button 19 for stopping the cleaning process of the print head 2, and a display part 20 for displaying confirmation messages and alarms such as warnings and abnormalities to the operator. The display part 20 may be configured to let the operator know the operating status and whether or not there is an abnormality, for example, by the presence or absence of a light or by changing the color.

[0020] In the inkjet recording device 600A of this embodiment, the head mounting unit 3 is fixed near the belt conveyor 11, but the head mounting unit 3 can be freely relocated to a location that is easier for the user to operate. The length of the cable (for the head mounting unit) 6 that connects the main body 1 and the head mounting unit 3 is preferably the same as or longer than the cable 5 that connects the main body 1 and the print head 2 of the inkjet recording device 600. This is to ensure a degree of freedom in the placement of the head mounting unit.

[0021] The main body 1 also has a fixing portion 91 for fixing the head mounting unit 3, and the head mounting unit 3 can be used by removing it from a fixing jig (for conveyor) 92 and attaching it to the fixing portion 91. When the inkjet recording device 600B is in use, the head mounting unit 3 can also be fixed to the main body 1 by combining a mating portion 93 with the fixing portion 91 assembled to the main body 1. The head mounting unit 3 of the inkjet recording device 600B is attached to the main body 1. By making the head mounting unit 3 fixable to the main body 1, it becomes possible to install the head mounting unit 3 even when there is no space to install the head mounting unit 3, for example, near the belt conveyor 11.

[0022] Next, we will explain the state in which the print head 2 is set in the head mounting unit 3 of the inkjet recording device 600B. The print head 2 is set by attaching the tip of the print head 2 to the head mounting section 81A of the head mounting unit 3. By setting the print head 2 in the head mounting unit in this way, the inkjet recording device 600 in this embodiment can clean the print head 2 with solvent 69A supplied from the main body 1 via the cable (for the head mounting unit) 6.

[0023] <Route configuration> Next, the path configuration of the inkjet recording apparatus 600 in the first embodiment will be described with reference to Fig. 2. Fig. 2 is a diagram showing the overall path configuration of the inkjet recording apparatus 600 in this embodiment.

[0024] First, the ink supply paths (paths 801 to 804) of the inkjet recording apparatus 600 in the first embodiment will be described. In Fig. 2, the main body 1 is provided with an ink container 31 that holds ink 68A for printing. The ink container 31 is provided with a liquid level sensor 31A that detects whether the liquid (ink 68A) in the ink container 31 has reached a reference liquid level, which is an appropriate amount to be held inside.

[0025] The ink container 31 is connected to a path (for supply) 801 at a portion immersed in the ink 68A, and a solenoid valve (for supply) 49 that opens and closes the path is installed midway along the path 801. Furthermore, the path 801 is connected via a junction path 901 to a pump (for supply) 34 that is installed in a path 802 and is used to suck and pressure-feed the ink 68A. The output side of the pump (for supply) 34 is connected to a filter (for supply) 39 that removes foreign matter mixed in the ink 68A.

[0026] Filter (for supply) 39 is connected to pressure regulating valve 46, which adjusts the pressure of ink 68A pumped from pump (for supply) 34 to an appropriate pressure for printing, and pressure regulating valve 46 is connected to pressure sensor 47, which measures the pressure of ink 68A supplied to nozzles 21. Path 802, in which pressure sensor 47 is arranged, is connected via branch path 921 to path 803, which passes through cable (for print head) 5, and path 803 is connected to switching valve 26, which is provided in print head 2 and controls whether ink 68A is supplied to nozzles 21.

[0027] The switching valve 26 is connected via a path 804 to a nozzle 21 having an ejection port 21A that ejects ink 68A. The switching valve 26 is a three-way solenoid valve, and is connected to an ink supply path 802 and a nozzle cleaning path 835, allowing the supply of ink 68A and solvent 69A to be switched to the nozzle 21. In the straight direction of the ejection port 21A of the nozzle 21, there are arranged a charging electrode 23 for adding a predetermined amount of charge to the ink droplets 68B, a deflection electrode 24 for deflecting the ink droplets 68B to be used for printing, and a gutter 25 for capturing the ink droplets 68B that are not used for printing and therefore fly straight without being charged or deflected.

[0028] Next, we will explain the ink recovery paths 811 and 812 of the inkjet recording apparatus 600. In Fig. 2, the gutter 25 is connected to the path 811, and a charge sensor 48 is disposed in the path 811 to detect whether ink particles 68B to which an electric charge has been added by the charging electrode 23 are being recovered. The path 811 passes through the cable (for the print head) 5 and is connected to a filter (for recovery) 40 disposed in the main body 1 that removes foreign matter mixed in with the ink, and the filter (for recovery) 40 is connected to a solenoid valve (for recovery) 50 that opens and closes the path.

[0029] The solenoid valve (for recovery) 50 is disposed in the path 812 connected via the confluence path 902, and is connected to the pump (for recovery) 35 that sucks the ink particles 68B captured by the gutter 25. The pump (for recovery) 35 is connected to the ink container 31. By opening the solenoid valve 50 and driving the pump 35, the ink particles 68B captured by the gutter 25 are collected into the ink container 31.

[0030] Next, we will explain the exhaust path (path 814) of the inkjet recording apparatus 600 in this embodiment. The ink container 31 is connected to the path 814 in an upper space that does not come into contact with the ink 68A, and the path 814 is connected to the exhaust duct connection part 62 that communicates with the outside of the main body 1.

[0031] Next, the ink circulation paths (paths 821 and 822) of the inkjet recording apparatus 600 in this embodiment will be described. In addition to the ink supply path 804, the nozzles 21 provided in the print head 2 are connected to a path 821 that passes through the cable (for print head) 5. This path 821 is provided with a solenoid valve (for circulation) 59 that is provided in the main body 1 and opens and closes the flow path. The solenoid valve (for circulation) 59 is connected to a path 822 via a junction path 903, and a pump (for circulation) 36 that sucks ink from the nozzles 21 is provided in the path 822. The pump (for circulation) 36 is connected to an ink container 31.

[0032] Next, the viscosity measurement paths (824 and 822) of the inkjet recording apparatus 600 in this embodiment will be described. In FIG. 2, the ink container 31 is connected to a path (for viscosity measurement) 824 at a portion immersed in the ink 68A. The path (for viscosity measurement) 824 is connected to a viscosity measuring device 45 to measure the viscosity of the ink 68A in the ink container 31. The viscosity measuring device 45 is connected to a solenoid valve (for viscosity measurement) 57 that opens and closes the path. The solenoid valve (for viscosity measurement) 57 is connected to a pump (for circulation) 36 disposed in the path 822 via a junction path 903. This allows the ink 68A in the ink container 31 to be circulated through the viscosity measurement path, thereby measuring the viscosity of the ink 68A. The viscosity measured in this manner is input to a control unit 7 (not shown in FIG. 2; see FIG. 3) and used to control the viscosity of the ink 68A in the ink container 31.

[0033] Next, the solvent supply paths (paths 831 and 833) of the inkjet recording apparatus 600 in this embodiment will be described. In FIG. 2, the main body 1 is provided with a solvent container 33 that holds a solvent 69A used for supplying solvent to the ink container 31, for nozzle cleaning, or for head cleaning. The solvent container 33 is connected to a path 831 at a portion immersed in the solvent 69A, and a pump (for solvent) 37 used for sucking and pumping the solvent is disposed in the path 831. The pump (for solvent) 37 is connected to a branch path 922 to change the supply destination of the solvent 69A depending on the purpose. The branch path 922 is connected to an electromagnetic valve (for solvent supply) 53 to open and close the flow path disposed in the path 833 in the solvent supply path, and the electromagnetic valve (for solvent supply) 53 is configured to be connected to the ink container 31. Using this path, the viscosity of the ink 68A in the ink container 31 is controlled by the control unit 7.

[0034] Next, the ink supply path 806 of the inkjet recording apparatus 600 in this embodiment will be described. In FIG. 2, the main body 1 is provided with an auxiliary ink container 32 that holds refill ink 68C. The auxiliary ink container 32 is connected to the path 806 at a portion immersed in the ink 68C. The path 806 is connected to a solenoid valve (for ink supply) 54 that opens and closes the path, and the solenoid valve (for ink supply) 54 is connected via a junction path 901 to a pump (for supply) 34 that is installed in the path 801 and is used to suck and pressure-feed the ink 68C. The ink 68C in the auxiliary ink container 32 is then replenished into the ink container 31 via the nozzle 21, the gutter 25, the path 811, the solenoid valve 50, and the pump 35.

[0035] Next, the nozzle cleaning paths (paths 831 and 835) of the inkjet recording apparatus 600 in this embodiment will be described. In FIG. 2, pump (for solvent) 37 arranged in path 831 is connected to path 835 via branch path 922. Path 835 is connected to solenoid valve (for nozzle cleaning) 55 for opening and closing the flow path. Solenoid valve (for nozzle cleaning) 55 is then connected to filter (for nozzle cleaning) 41 for removing foreign matter mixed in solvent 69A. Filter (for nozzle cleaning) 41 is provided in print head 2 via path 821 that passes through cable (for print head) 5, and is connected to switching valve 26 for controlling whether solvent 69A for cleaning is sent to nozzles 21.

[0036] Next, the main body circulation paths (paths 808 and 812) of the inkjet recording apparatus 600 in this embodiment will be described. Path 802 is connected to path 808 via a branch path 921. Path 808 is connected to a solenoid valve (for main body circulation) 58 that opens and closes the path, and solenoid valve (for main body circulation) 58 is connected to a pump (for circulation) 35 installed in path 812 via a junction path 902.

[0037] Next, the head cleaning paths (paths 831 and 837) of the inkjet recording apparatus 600 in this embodiment will be described. In Fig. 2, the pump (for solvent) 37 is connected to the path 837 via a branch path 922, and the path 837 is provided with an electromagnetic valve (for head cleaning) 56 for opening and closing the flow path, and the electromagnetic valve (for head cleaning) 56 is connected to a filter (for head cleaning) 43 for removing foreign matter mixed in the solvent 69A.

[0038] The filter (for head cleaning) 42 is provided in the head mounting unit 3 via a path 822 that passes through the cable (for head mounting unit) 6 and is connected to a filter (for head cleaning) 43 to remove foreign matter that may initially be mixed into the path 837. The output side of the filter (for head cleaning) 43 is connected to a cleaning nozzle 72 provided inside a cleaning tank 71 of the head mounting unit 3. The space inside the cleaning tank 71 is configured to communicate with a recovery container 4 installed below. The recovery container 4 is provided to collect the solvent after cleaning with the cleaning liquid (solvent) sprayed from the cleaning nozzle 72 grounded inside the cleaning tank 71. A float 74 is provided inside the recovery container 4 to detect the liquid level of the solvent after cleaning. When the float 74, which has a built-in magnet, reaches a predetermined liquid level, a magnetic sensor A76 detects the liquid level and outputs a signal to a control unit (not shown in FIG. 2) that the cleaning liquid in the recovery container 4 has reached the predetermined liquid level.

[0039] Next, the air supply path (path 841) of the inkjet recording apparatus 600 in this embodiment will be described. In Fig. 2, the main body 1 is provided with a pump (for drying) 60 used to suck and pressurize air, and the pump (for drying) 60 forms an air suction port that communicates with the inside of the main body 1. The pump (for drying) 60 is connected to an air supply nozzle 73 provided inside the cleaning tank 71 of the head mounting unit 3 via a path 841 that passes through the cable (for the head mounting unit) 6.

[0040] Next, the air suction path (path 843) of the inkjet recording apparatus 600 in this embodiment will be described. The cleaning tank 71 provided in the head mounting unit 3 is connected to an air pump (for suction) 61 used to suck and pressurize air provided in the main body 1 via a path 843 that passes through a cable (for the head mounting unit) 6. The pump (for suction) 61 is connected to an exhaust duct connection part 62 that communicates with the outside of the main body 1.

[0041] <Controller configuration> Next, the configuration of the control unit 7 of the inkjet recording apparatus 600 in this embodiment will be described. FIG. 3 is a diagram showing the schematic configuration of the control unit 7 and printing mechanism (main body 1 and print head 2) of the inkjet recording apparatus 600 in this embodiment. In FIG. 3, 301 is a microprocessing unit (hereinafter referred to as MPU), which is the control unit that controls the entire inkjet recording apparatus 600. 302 is a bus line that functions to transmit data, control signals, etc. between the various devices that make up the control unit. For example, the bus line 302 is used to input data and detection signals required for the calculations of the MPU 301 from various devices and to transmit data signals, address signals, and control signals to various devices. 306 is a read-only memory (ROM) that stores control programs and data required for the operation of the MPU 301. 307 is a rewritable memory (RAM) that temporarily stores data required by the MPU 301 while the program is running. 8 is an operation and display unit that inputs print content, setting values, etc., and displays the input data and print content, etc. The operation display unit 8 uses a touch input display panel in which transparent touch switches are superimposed on the surface of a liquid crystal display screen.

[0042] The head-mounted unit 3 can be controlled from the operation display unit of the control unit 7, but the operation unit (start button 18 and stop button 19) is used when operating the head-mounted unit 3 near the head-mounted unit 3, rather than on the operation display unit 8. The display unit 20 is used when checking the operating status and abnormality messages, etc., of the head-mounted unit 3 near the head-mounted unit 3, rather than on the operation display unit 8.

[0043] The print head 2 of the inkjet recording device 600 is equipped with a nozzle 21 that atomizes and ejects ink 68A supplied under pressure from an ink container 31. The nozzle 21 ejects the ink in a columnar shape, the tip of which separates and is ejected as ink droplets 68B. The print head 2 also has a charging electrode 23 that surrounds the ink droplets 68B, and charges the ink droplets 68B in accordance with the print content.

[0044] Furthermore, the print head 2 deflects flying ink droplets 68B charged by the charging electrode 23 according to the amount of charge, causing them to fly toward a print target (not shown). These flying ink droplets then land on the print target, resulting in printing. The deflection electrode 24 of the print head 2 is composed of a ground electrode 24B and a positive electrode 24A. The print head 2 also includes a gutter 25 that captures ink droplets 68B (unused ink) not used in printing, and a charge sensor 48 that generates a phase detection signal according to the amount of charge on ink droplets 68B1 that carry a slight charge among the ink droplets 68B captured by the gutter 25. The main body 1 also includes a pump (for recovery) 35 that recovers the ink (ink droplets) captured by the gutter 25 into the ink container 31, and ink recovery paths 811-812 that connect the gutter 25 to the ink container 31.

[0045] The control unit 7 also has an excitation voltage generating circuit 331 that excites an electrostrictive element 22 (not shown) built into the nozzle 21 in order to impart regularity to the timing at which the ink column ejected from the nozzle 21 separates into ink particles 68B.

[0046] The control unit 7 also has a printing charge signal generating circuit 342 and a phase search charge signal generating circuit 341, a D / A converter 343 that converts the digital signal-form charge signals output from these circuits into analog voltage signals, and an amplifier circuit 344 that amplifies the analog voltage signal output from the D / A converter 343 to generate a charge voltage to be applied to the charging electrode 23. Instead of the configuration that includes the printing charge signal generating circuit 342 and the phase search charge signal generating circuit 341, it is also possible to use only the printing charge signal generating circuit 342 and have the control unit control the charge amount. The inkjet recording apparatus 600 also has a deflection voltage generating circuit 332 that generates a deflection voltage to be applied to the deflection electrode 24.

[0047] The inkjet recording apparatus 600 also includes an amplifier circuit 353 that amplifies the phase detection signal in the form of an analog signal output from the charge sensor 48, a phase determination circuit 351 that inputs the amplified phase detection signal and determines whether charging is good or bad, and an A / D converter 352 that inputs the amplified phase detection signal and performs A / D conversion.

[0048] Next, in FIG. 3, the MPU 301 of the control unit 7 is connected via a bus line 302 to a liquid level detection circuit 313 for managing the liquid level in the ink container 31, a pressure detection circuit 312 for detecting whether the pressure of the ink supplied to the nozzles 21 is at an appropriate value, a viscosity measurement circuit 311 for measuring with a viscosity meter 45 whether the viscosity of the ink 68A supplied to the nozzles 21 is at an appropriate value for printing, a pump control circuit 314 for controlling each of the pumps 34 to 37 provided in the main body 1 for sucking and pressure-feeding the ink 68A and solvent 69A, and a solenoid valve drive circuit 315 for controlling the opening and closing operations of each of the solenoid valves 49 to 50 and 53 to 59 on each path, and controls each unit.

[0049] The MPU 301 is also connected via bus line 302 to an air pump control circuit 321 for controlling pumps 60 and 61, a collection container sensor detection circuit 322 for detecting using magnetic sensor A76 and magnet A75 that the collection container 4 is attached to the head mounting unit 3 and that the liquid 70 in the collection container 4 is not greater than a predetermined amount, a print head detection circuit 323 for detecting on the head mounting unit 3 side that the print head 2 is attached to the head mounting unit 3 using magnetic sensor B84 and magnet B86, and a head mounting unit detection circuit 324 for detecting on the print head 2 side that the print head 2 is attached to the head mounting unit 3 using magnetic sensor C28 and magnet C87, and controls each part.

[0050] The control unit 7 can use a computer. Specifically, the control unit 7 can be made up of an MPU 301, memories (306 and 307) that store programs for the operation of the MPU 301 and data and information required for operation, and a drive unit that operates the print head 2, head mounting unit 3, and components within the main body 1 in response to instructions from the MPU 301. A detailed description of the control unit 7 will be omitted here.

[0051] <Head mounted unit configuration> Next, the detailed configuration of the head mounting unit 3 of the inkjet recording apparatus 600 in Example 1 will be described with reference to Figs. 4 to 6. Fig. 4 is a structural diagram of the head mounting unit 3 (a cross-sectional view of the cleaning nozzle 72). Fig. 5 is a cross-sectional view of the head mounting unit 3 with the collection container removed. Fig. 6 is a cross-sectional view of the head mounting unit with the print head mounted.

[0052] First, the configuration of the head mounting unit will be described with reference to Figure 4. In Figure 4, the head mounting unit 3 comprises a cleaning tank 71 in which the print head 2 is housed during head cleaning, a cleaning block 81 that is installed above the cleaning tank 71 and is configured with a head mounting section 81A for setting the print head 2 in the head mounting unit 3 and a head insertion section 81B that is an entrance for inserting the print head 2 into the cleaning tank 71, and a recovery container 4 for storing liquid 70A used in the head cleaning process.

[0053] A lid member 83 is attached to the cleaning block 81 to prevent dust and other foreign matter from entering the cleaning tank 71 through the head insertion portion 81B, which is an opening, when the print head 2 is not set in the head insertion portion 81B. The lid member 83 is attached to the cleaning block 81 via a lid hinge 82. A magnet B86 is attached to this lid member 83, which is used to detect that the print head 2 has been set in the head mounting unit 3. A magnetic sensor B84 is attached to the cleaning block 81, which detects that the magnet B86 has come within a certain distance when the print head 2 has been set in the head mounting unit 3. A magnet C87 is also attached to the cleaning block 81, which is used to detect that the print head 2 has been set in the head mounting unit 3.

[0054] The cleaning block 81 is fitted with a cleaning nozzle 72 for ejecting a head cleaning solvent 69A toward the print head 2, and a supply nozzle 73 having an air outlet for spraying air to dry the print head 2 that has been wetted with the solvent 69A after head cleaning.

[0055] The cleaning nozzle 72 is formed with a liquid discharge hole A section 72A for spraying the solvent 69A so as to target the nozzle 21 assembled to the print head 2, and a liquid discharge hole B section 72B for spraying the solvent 69A so as to target the deflection electrode 24. The cleaning nozzle 72 is connected to a flow path B section 81E formed in the cleaning block 81.

[0056] The air supply nozzle 73 has an air discharge hole 73A formed therein for spraying air aimed at the gap between the electrodes of the charging electrode 23 attached to the print head 2. The air supply nozzle 73 is connected to a flow path C section 81F formed in the cleaning block 81. Furthermore, the cleaning block 81 has a hole 81C that communicates with the interior of the cleaning tank 71 into which the print head 2 is inserted during head cleaning, and a flow path A section 81D that is connected to the hole 81C.

[0057] The head mounting unit 3 is equipped with a cleaning tank 71 below the cleaning block 81 for storing the print head 2 during head cleaning. The cleaning tank 71 has side walls formed to prevent the solvent 69A sprayed from the cleaning nozzle 72 from splashing around, and an attachment part 71A used when attaching the collection container 4. A temperature sensor B80 is also installed inside the cleaning tank 71 to detect the ambient temperature of the head mounting unit 3 and use it for various controls. Furthermore, a magnetic sensor A76 is installed in the cleaning tank 71 to detect that the collection container 4 is attached to the head mounting unit 3.

[0058] Furthermore, the head mounting unit 3 is provided with a collection container 4 for storing liquid 70A used when cleaning the head, below the cleaning tank 71. The collection container 4 is made up of a container 77 for storing liquid 70A, a partition 78 attached to reduce the splashing of liquid 70A when the collection container 4 is carried, a float 74 equipped with a magnet A75, and a holder 79 for restricting the movement of the float 74.

[0059] The container 77 is formed with a liquid storage section 77B for storing the liquid 70A used in the head cleaning process, a mounting section 77A used when fixing it to the cleaning tank 71, and an internal thread section 77C for attaching a partition 78. The partition 78 is formed with a liquid inlet hole 78A provided to allow the liquid 70A dripping from the cleaning tank 71 to flow into the container 77, and a liquid outlet hole 78B provided to allow the liquid 70A to flow out of the container 77 when the recovery container 4 is tilted.

[0060] A liquid joint 89 connected to the flow path B section 81E is attached to the cleaning block 81, and a tube 837A is connected to the liquid joint 89 by press-fitting or other methods. This tube 837A forms part of the head cleaning path 837, and is connected to the solvent container 33 in the main body 1 via the tube 837A. Furthermore, an air joint 90 connected to the flow path C section 81F is attached to the cleaning block 81, and a tube 841A is connected to the air joint 90 by press-fitting or other methods. This tube 841A forms part of the path (for air supply) 841, and is connected to the pump (for drying) 60 via the tube 841A.

[0061] Furthermore, a suction joint 88 connected to the flow path A portion 81D is assembled to the cleaning block 81, and a tube 843A is connected to the suction joint 88 by a method such as press-fitting. This tube 841A forms part of the path (for air suction) 841, and is connected to the pump (for suction) 61 via the tube 841A. This suction joint 88 is formed by joining a joint A portion 88B and a joint B portion 88C, and a chamber 88A is formed between the joint A portion 88B and the joint B portion 88C.

[0062] The head mounting unit 3 is covered with a cover 85 to prevent tubes 837A, 841A, and 843A from being exposed to the outside of the head mounting unit 3, and the cover 85 is fixed so as to sandwich the upper part of the cleaning block 81 and the lower part of the cleaning tank 71. The cable (for the head mounting unit) 6 is attached to the lower part of the cover 85 so as not to protrude outside and interfere with other production equipment. In addition to the tubes 837A, 841A, and 843A, the cable (for the head mounting unit) 6 also carries an electric wire 76A connected to magnetic sensor A 76, an electric wire 84A connected to magnetic sensor B 84, an electric wire connected to temperature sensor B 80, and harnesses (not shown) for operating the start button 18, the stop button 19, and the display unit 20, and connects the head mounting unit 3 to the main body 1.

[0063] Next, a state in which the collection container 4 has been detached from the head mounting unit 3 will be described with reference to FIG. 5. In the inkjet recording device 600, by rotating the collection container 4 by approximately 90 degrees while the head mounting unit 3 is fixed, the attachment portion 71A of the head mounting unit 3 and the attachment portion 77A of the collection container 4 that engages with it become detached, and the collection container 4 can be separated from the head mounting unit 3. In this state, the magnet A75 installed inside the float 74 and the magnetic sensor A76 installed in the cleaning tank 71 are separated by a certain distance or more (a distance at which the magnetic sensor A76 no longer recognizes the magnet A75). This state is transmitted to the control unit 7 via the electric wire 76A. Therefore, the control unit 7 can recognize that the collection container 4 has been detached from the head mounting unit 3.

[0064] Next, the state in which the print head 2 is mounted in the head mounting unit 3 will be described using Figure 6. The lid member 83 of the head mounting unit 3 is opened by inserting the print head 2, with the protective cover 17 removed, into the head insertion section 81B. The print head 2 is pushed into a position where the nozzle 21, charging electrode 23, deflection electrode 24, and gutter 25 are located in the space surrounded by the cleaning tank 71 and cleaning block 81.

[0065] The head mounting unit 3 is designed so that the inner wall surface of the hole in the head insertion portion 81B fits into the outer wall surface of the head base 16 of the print head 2, preventing misalignment of the print head 2 left and right, front and rear. Furthermore, by having part of the print head 2 rest in a position where it abuts the head mounting portion 81A formed in the cleaning block 81, the position of the print head 2 when set in the head mounting unit 3 is stable. The print head 2 of this embodiment is also equipped with a magnetic sensor C28 and a temperature sensor A27. An electric wire 28A connected to the magnetic sensor C28 and an electric wire 27A connected to the temperature sensor A27 are connected to the control unit 7 installed in the main body 1 through the inside of a cable (for print head) 5.

[0066] When the print head 2 is attached to the head mounting unit 3, the cover member 83 is opened by the print head 2, causing the magnet B86 attached to the cover member 83 to move in conjunction with the print head 2, and the magnet B86 and the magnetic sensor B84 come within a certain distance, as shown by the dotted circle M2. This allows the head mounting unit 3 to recognize that the print head 2 is attached to the head mounting unit 3. Furthermore, when the print head 2 is attached to the head mounting unit 3, the magnet C87 attached to the cleaning block 81 and the magnetic sensor C28 attached to the print head 2 come within a certain distance, as shown by the dotted circle M3, allowing the print head 2 to recognize that the print head 2 is attached to the head mounting unit 3. In this way, by using two sensors to check whether the print head 2 is attached to the head mounting unit 3, erroneous detection due to component failure or the like is prevented.

[0067] Furthermore, when the collection container 4 is attached to the head mounting unit 3, as shown by the dotted circle M1, the magnet A75 attached to the float 74 of the collection container 4 and the magnetic sensor A76 attached to the cleaning tank 71 of the head mounting unit come within a certain distance. This state is detected by the magnetic sensor A76, which enables the control unit 7 to recognize that the collection container 4 has been attached to the head mounting unit 3. This detection makes it possible to prevent erroneous operations such as starting the head cleaning process without attaching the collection container 4.

[0068] <Head cleaning and drying process> In the inkjet recording apparatus 600 according to the first embodiment, the operation when the head cleaning process and the head drying process are performed with the print head 2 set in the head mounting unit 3 will be described with reference to FIGS. 7 to 11.

[0069] First, the operation of the inkjet recording apparatus 600 when a head cleaning process is being performed will be described with reference to Figures 7 and 8. Figure 7 is a fluid path diagram showing the flow of liquid and gas in the entire apparatus when a head cleaning process is being performed, indicated by thick lines (A1 to A8). Figure 8 is a cross-sectional view of the head mounting unit, showing the flow of liquid and gas inside the head mounting unit 3 when a head cleaning process is being performed, indicated by thick lines (A1 to A7).

[0070] 7 and 8, the inkjet recording apparatus 600 is in a state in which the print head 2 is set (mounted) in the head mounting unit 3 for print head cleaning. In the head cleaning path (path 831, path 837), the solenoid valve (for head cleaning) 56 is energized to open the flow path and operate the pump (for solvent) 37, thereby supplying the solvent, which is the cleaning liquid, to the head mounting unit 3, as indicated by the thick arrow A1. In other words, the solvent 69A stored in the solvent container 33 of the main body 1 can be supplied to the cleaning nozzle 72 installed in the cleaning tank 71 of the head mounting unit 3.

[0071] The cleaning nozzle 72 sprays (ejects) this solvent 69A toward the print head 2 to clean the print head 2. Specifically, the solvent 69A supplied to the cleaning nozzle 72 is sprayed in the directions indicated by arrow A2 (the direction in which the solvent 69A is sprayed from the liquid discharge hole A portion 72A toward the nozzle 21) and arrow A3 (the direction in which the solvent 69A is sprayed from the liquid discharge hole B portion 72B toward the deflection electrode 24), spraying the solvent 69A onto components such as the nozzle 21 and deflection electrode 24 assembled to the print head 2 and cleaning away stains caused by ink 68A that adhered during operation or maintenance of the inkjet recording apparatus 600. After cleaning the components such as the nozzle 21 and deflection electrode 24 assembled to the print head 2, the solvent 69A drips and flows downward due to gravity. When the print head 2 is set in the head mounting unit 3, the charging electrode 23 and the gutter 25 located below the deflection electrode 24 can be cleaned with the solvent 69A.

[0072] During the head cleaning process, the solvent 69A that has cleaned components such as the nozzle 21, charging electrode 23, deflection electrode 24, and gutter 25 arranged on the print head 2 drips in the direction indicated by arrow A4, flows into a recovery container 4 installed at the bottom of the head mounting unit 3, and is collected in the liquid storage section 77B as liquid 70A.

[0073] Furthermore, in the ink circulation paths (821-822), the electromagnetic valve (for circulation) 59 is energized to open the flow path and operate the pump (for circulation) 36, whereby part of the solvent 69A that hits the nozzles 21 is sucked from the nozzles 21 as shown by the thick line of arrow A5 and collected in the ink container 31 of the main body 1. In this way, in the head cleaning process, the inside of the nozzles 21 and the ink circulation paths 821-822 can also be cleaned with the solvent 69A.

[0074] Furthermore, in the ink recovery paths (811-812), when the solenoid valve (for recovery) 50 is energized to open the flow path and operate the pump (for recovery) 35, part of the solvent 69A that hits the gutter 25 is sucked out of the gutter 25 as shown by the thick line of arrow A6 and recovered in the ink container 31 of the main body 1. In this way, in the head cleaning process, the inside of the gutter 25 and the ink recovery paths 811-812 can also be cleaned with the solvent 69A.

[0075] The nozzles 21 and the gutter 25 suck in the surrounding air along with the solvent 69A. The sucked air dissolves the vaporized solvent 69A in the ink circulation paths 821-822 and the ink recovery paths 811-812, turning into solvent vapor. This solvent vapor flows into the ink container 31, and is then discharged via a path 814 to the exhaust duct connector 62, which communicates with the outside of the main body 1.

[0076] In the air suction path (path 841), by operating the pump (for suction) 61, as indicated by the thick line of the arrow A7, the solvent vapor generated in the cleaning tank 71 of the head mounting unit 3 is sucked through the hole 81C and discharged to the exhaust duct connection part 62 that communicates with the outside of the main body 1. In the inkjet recording device 600, the solvent vapor discharged from the ink container 31 and the solvent vapor discharged from the head mounting unit 3 are discharged together from the exhaust duct connection part 62. The exhaust duct connection part 62 is located away from the operation display part 8 of the main body 1, and is attached to the back or bottom of the main body 1, for example.

[0077] Furthermore, there is a possibility that some of the solvent 69A sprayed from the cleaning nozzle 72 may flow into the flow path A section 81D through the hole 81C. For this reason, a chamber 88A is provided in the air suction path (see FIG. 4) to trap the solvent 69A that has flowed into the flow path A section 81D so that it does not flow toward the pump (for suction) 61. The solvent 69A trapped in the chamber 88A is dried during the head drying process so that no solvent 69A remains in the chamber 88A after the head drying process is completed.

[0078] Next, the operation of the inkjet recording apparatus 600 according to the first embodiment when a head drying process is performed on the print head 2 after print head cleaning will be described with reference to Figures 9 and 10. Figure 9 is a fluid path diagram showing the flow of gas in the entire apparatus with thick lines (B1 to B6) when a head drying process is being performed. Figure 10 is a cross-sectional view of the head mounting unit 3 showing the flow of liquid and gas inside the head mounting unit 3 with thick lines (B1 to B5) when a head drying process is being performed.

[0079] 9 and 10, the print head 2 is set (mounted) in the head mounting unit 3, and after the head cleaning process is completed, the head drying process is performed. In the air supply path 841, compressed air is supplied to the air supply nozzle 73 installed in the cleaning tank 71 of the head mounting unit 3 by operating the pump (drying) 60 installed in the main body 1, as indicated by the bold arrow B1. The air supplied to the air supply nozzle 73 is discharged toward the charging electrode 23 of the print head 2, as indicated by the arrow B2. Because the gaps between the charging electrodes 23 are narrower and more difficult to dry than the gaps between the deflection electrodes 24, the air is aimed at the charging electrode 23 by the air discharge holes 73A formed in the air supply nozzle 73. The air discharged from the air supply nozzle 73 dries the components installed inside the print head 2, such as the nozzle 21, charging electrode 23, deflection electrode 24, and gutter 25.

[0080] In the ink recovery paths 811-812, when the solenoid valve (for recovery) 50 is energized to open the flow path and the pump (for recovery) 35 is operated, some of the air is sucked through the gutter 25 and sucked and pressure-fed to the ink container 31 of the main body 1, as indicated by the bold line of arrow B5. In the ink circulation paths 821-822, when the solenoid valve (for circulation) 59 is energized to open the flow path and the pump (for circulation) 36 is operated, some of the air is sucked through the nozzle 21 and sucked and pressure-fed to the ink container 31 of the main body 1, as indicated by the bold line of arrow B4. The air that has flowed into the ink container 31 is then exhausted to the outside of the main body 1 through the exhaust path 805, as indicated by the bold line of arrow P. In this way, by sucking air through the gutter 25 and the nozzle 21 during the head drying process, the amount of solvent gas emitted around the head mounting unit 3 can be reduced.

[0081] In the air suction path (path 841), by operating the pump (for suction) 61, solvent vapor generated in the cleaning tank 71 of the head mounting unit 3 is sucked through the hole 81C, as indicated by the thick line of arrow B3, and discharged to the exhaust duct connection part 62 that communicates with the outside of the main body 1. The inkjet recording device 600 is configured so that the solvent vapor discharged from the ink container 31 and the solvent vapor discharged from the head mounting unit 3 are discharged together through the exhaust duct connection part 62. If the flow rate of air used by this pump (for suction) 61 to suck the solvent vapor from inside the cleaning tank 71 through the hole 81C is greater than the flow rate of air supplied from the air supply nozzle 73 into the cleaning tank 71 by the pump (for drying) 60, the solvent vapor discharged from the head mounting unit 3 can be significantly reduced. Furthermore, when the flow rate of air sucked from the hole 81C is high, an air flow is generated inside the cleaning tank 71, which is expected to have the effect of shortening the drying time of components such as the nozzle 21, charging electrode 23, deflection electrode 24, and gutter 25 assembled inside the print head 2.

[0082] Next, a state in which the amount of liquid stored in the collection container 4 has increased after the head cleaning process has been repeatedly performed in the inkjet recording apparatus 600 in the first embodiment will be described with reference to Fig. 11. Fig. 11 is a cross-sectional view of the head mounting unit showing a state in which a large amount of cleaning liquid has been stored in the collection container of the first embodiment.

[0083] When the liquid 70 in the collection container 4 is almost full, the state shown in FIG. 11 is reached. Specifically, as the liquid level in the collection container 4 rises, the float 74 floats, and the magnetic sensor A 76 is unable to output a liquid level detection signal. In this case, the control unit 7 can detect (determine) that the amount of liquid 70 that can be further accommodated in the collection container 4 is small and that the collection container 4 is almost full. When the control unit 7 detects this state, it displays a warning on the operation display unit 8. For example, it may display a message instructing the user to remove the collection container 4 and drain the liquid 70 therein. While the warning has been described as being displayed on the operation display unit 8, it may also be displayed on the display unit 20 of the head mounting unit 3, or by a buzzer or voice. In addition to a visual warning, a buzzer or voice warning may also be used. This warning allows the operator to remove the collection container 4 and drain the liquid 70 therein, as shown in FIG. 5. Then, the empty collection container 4 is reattached to the bottom of the cleaning tank 71. Since the magnetic sensor A76 of the liquid level detection device is installed on the outside of the recovery container 3, the recovery container 4 can be easily removed and attached.

[0084] When the collection container 4 is attached, the float 74 is in a position where it can be detected by the magnetic sensor A76, so the magnetic sensor A76 starts outputting a liquid level detection signal. The control unit 7 receives the liquid level detection signal from the magnetic sensor A76 and can determine that the collection container 4 has been attached. Based on this determination, the control unit 7 erases the warning display that was being displayed on the operation display unit 8. Alternatively, the control unit 7 can display that the head mounting unit 3 is in an operable (cleanable) state, or can control the operation of the head cleaning operation to be cancelled and allow head cleaning.

[0085] Furthermore, regarding the amount of liquid 70 in the collection container 4, without providing a physical sensor (such as magnetic sensor A76), the amount of solvent to be used may be determined depending on the head cleaning mode, such as "small amount cleaning: 6 ml," "standard cleaning: 12 ml," or "thorough cleaning: 24 ml," and when head cleaning is performed, the control unit 7 may estimate the amount of liquid 70 in the collection container 4, and restrict the head cleaning operation at the necessary timing or instruct the waste liquid from the collection container 4.

[0086] <Head cleaning mode setting screen> The head cleaning related setting screen of the inkjet recording apparatus 600 according to the first embodiment will be described with reference to Fig. 12. The screen of Fig. 12 is displayed on the operation display unit 8.

[0087] First, in the (1) head cleaning mode selection field on the head cleaning related settings screen, one of "(a) small amount cleaning, (b) standard cleaning, (c) thorough cleaning, (d) automatic selection" is selected. The difference between (a) to (c) is the amount of solvent 69A used in the head cleaning process. For example, the amount of solvent used for each is "(a) small amount cleaning: 6 ml, (b) standard cleaning: 12 ml, (c) thorough cleaning: 24 ml." The amount of solvent used and the control method when "(d) automatic selection" is selected will be described later as Example 2.

[0088] Next, select either "(e) Automatic" or "(f) Manual Setting" in the (2) Head Drying Time Setting field on the head cleaning related settings screen. If "(e) Automatic" is selected, the head drying time is set to a predetermined time based on the type of solvent 69A and the values ​​detected by temperature sensor A27 and temperature sensor B80. If "(f) Manual" is selected, the head drying time can be set between 0 and 10 minutes.

[0089] Next, in the (3) Automatic power off after processing field on the head cleaning related settings screen, select either "(g) No" or "(h) Yes." If "(g) No" is selected, the inkjet recording apparatus 600 will be powered on after the head cleaning process is complete. If "(h) Yes" is selected, the inkjet recording apparatus 600 will be automatically powered off after the head cleaning process is complete.

[0090] Then, after completing all the settings (1) to (3) on the head cleaning related settings screen, press either the "(i) Confirm" or "(j) Cancel" button. If the "(i) Confirm" button is pressed, the displayed settings (1) to (3) are sent to the control unit 7 and overwritten, so that the next time head cleaning is performed, the settings will be reflected. If the "(j) Cancel" button is pressed, the displayed settings (1) to (3) are not sent to the control unit 7 and are not overwritten. Therefore, the next time head cleaning is performed, the settings (displayed on the screen) from when the "(i) Confirm" button was pressed will continue to be used.

[0091] <Explanation of Head Cleaning Operation Flow in Example 1> Next, the operational flow of the head cleaning process of the inkjet recording apparatus 600 in this embodiment will be described with reference to Fig. 13. Fig. 13 is a flowchart of the head cleaning process in the first embodiment.

[0092] 13, first, in step S101, the start button for performing the head cleaning process, which is displayed on the touch panel operation display unit 8, is pressed. Alternatively, the start button 18 provided on the head mounting unit 3 is pressed. The conditions under which the start button for performing the head cleaning process is enabled are that ink ejection from the nozzles 21 of the print head 2 of the inkjet recording apparatus 600 has stopped, and that no power is being supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, and that the ink circulation system components are not operating.

[0093] In step S111, it is confirmed whether the magnetic sensor A76 of the head mounting unit 3 is in the "ON" state (detecting the magnet A75 of the waste toner container 4).

[0094] In step S112, if the confirmation result of step S111 shows that the magnetic sensor A76 is "ON", it is determined to be "YES" (the collection container 4 is set (attached) to the head mounting unit 3), and the process proceeds to step S121. If the confirmation result of step S111 shows that the magnetic sensor A76 is "OFF", it is determined to be "NO" (the collection container 4 is not set (attached) to the head mounting unit 3, or liquid 70A has accumulated in the collection container 4 and the float 74 is floating), and the process proceeds to step S113.

[0095] In step 113, the operation display unit 8 of the main body 1 or the display unit 20 of the head-mounted unit 3 displays a message such as "Please drain the liquid 70A from the collection container 4 and empty it. Please set the empty collection container 4 in the head-mounted unit."

[0096] In step S114, the worker sets the empty collection container 4 in the head-mounted unit 3. After that, the worker presses the operation display unit 8 of the main body 1 or the start button 18 of the head-mounted unit 3 to execute the process of step S111 again.

[0097] In step S121, it is confirmed whether the magnetic sensor B84 of the head mounting unit 3 is in the "ON" state (detecting the magnet B86 attached to the cover member 83), and whether the magnetic sensor C28 of the print head 2 is in the "ON" state (detecting the magnet C87 attached to the cleaning block 81).

[0098] In step S122, if the check result in step S121 shows that magnetic sensor B84 is "ON" and that magnetic sensor C28 is "ON", the process determines "YES" (the print head 2 is set (mounted) in the head mounting unit 3) and proceeds to step S131. If the check result in step S121 shows that either magnetic sensor B84 or magnetic sensor C28 is "OFF", the process determines "NO" (the print head 2 is not set (mounted) in the head mounting unit 3) and proceeds to step S123.

[0099] In step S123, a message such as "Please set the print head in the head mounting unit" is displayed on the operation display unit 8 of the main body 1 or the display unit 20 of the head mounting unit 3. In step S124, the worker sets the print head 2 in the head mounting unit 3. After that, the worker presses the start button 18 on the operation display unit 8 of the main body 1 or the head mounting unit 3 to execute the processing of step S121 again.

[0100] In step S131, if the content pre-set in the (1) head cleaning mode selection field on the head cleaning related setting screen shown in Figure 12 is "(a) small amount cleaning", proceed to step S132; if it is "(b) standard cleaning", proceed to step S133; if it is "(c) thorough cleaning", proceed to step S134.

[0101] Steps S132 to S134 are head cleaning steps, which execute the head cleaning process (the solvent 69B is sprayed from the cleaning nozzle 72 of the head mounting unit 3 to clean the print head 2) determined by each head cleaning mode ((a) small amount cleaning, (b) standard cleaning, (c) thorough cleaning, (d) automatic selection). Once this is complete, proceed to step S141 in either case.

[0102] In step S141, if the content pre-set in the (2) Head Drying Time Setting field on the head cleaning related setting screen shown in Figure 12 is "(e) Automatic", proceed to step S142, and if it is "(f) Manual Setting", proceed to step S143.

[0103] Step S142 is a head drying step, in which a head drying process (air is sprayed from the air supply nozzle 73 of the head mounting unit 3 and solvent vapor is sucked through the hole 81C in the cleaning tank 71 to dry the print head 2) is performed for a predetermined time based on the type of solvent 69A and the values ​​detected by the temperature sensor A27 and the temperature sensor B80.

[0104] Step S143 is the head drying step, and the head drying process (air is sprayed from the air supply nozzle 73 of the head mounting unit 3 and solvent vapor is sucked from the hole 81C in the cleaning tank 71 to dry the print head 2) is performed for the head drying time (set between 0 and 10 minutes) entered in "(f) Manual Setting".

[0105] In step S151, if the preset setting for automatic power-off after processing on the head cleaning related setting screen shown in Figure 12 is "(g) No", proceed to step S152, and if it is "(h) Yes", proceed to step S153.

[0106] In step S152, the ink jetting from the nozzles 21 of the print head 2 of the inkjet recording apparatus 600 has stopped, and power is not supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, so that they are not operating. In this state, the head cleaning operation flow ends.

[0107] In step S153, after the head drying step is completed, the inkjet recording apparatus 600 is powered off, and the head cleaning operation flow ends.

[0108] <Effects of Example 1> As described above, according to the first embodiment of the present invention, when cleaning the print head 2, the amount of solvent vapor emitted around the print head 2 can be reduced, thereby reducing the smell of solvent vapor that the worker senses when cleaning the print head 2.

[0109] Furthermore, according to the first embodiment of the present invention, it is possible to provide an inkjet recording device 600 that can detect whether the print head 2 and the collection container 4 are set in the head mounting unit 3 and determine whether head cleaning can be performed, thereby preventing erroneous operations.

[0110] Example 2

[0111] Next, an inkjet recording apparatus 600 according to a second embodiment of the present invention will be described. In the second embodiment, the same configuration as that shown in FIGS. 1 to 11 described in the first embodiment is also adopted. FIG. 14 shows a method for detecting the cleaning and drying states in the second embodiment, and FIG. 15 shows an operation flow in the second embodiment. As the explanations regarding FIGS. 1 to 11 have already been given, their explanation will be omitted. Then, using FIGS. 14 and 15, the differences from the first embodiment will be mainly described.

[0112] <Judgment of Head Cleaning and Drying Condition in Example 2> First, a method for determining ink stains during head cleaning processing will be described with reference to FIG.

[0113] In the inkjet recording apparatus 600 of the second embodiment, with the print head 2 set (mounted) in the head mounting unit 3, a small amount (for example, 1 to 5 ml) of solvent 69A is sprayed from the cleaning nozzle 72 by the method described in Figures 7 and 8 of the first embodiment to wet the components (nozzle 21, charging electrode 23, deflection electrode 24, gutter 25, etc.) assembled to the print head 2. With the print head 2 wet, a voltage (for example, 1 to 7 kV) is applied to the deflection electrode 24 using the deflection voltage generation circuit 332.

[0114] The solvent 69A used in the inkjet recording device 600 is a non-conductive liquid, but the ink 68A is made conductive by mixing a conductive substance into the material. The ink 68A attached to the print head 2 is non-conductive in a dry state, but becomes a conductive liquid when wetted with the solvent 69A. Therefore, if the print head 2 is contaminated with ink 68A, wetting it with the solvent 69A and applying a voltage to the deflection electrode 24 causes a current to flow, which can be detected by the charge sensor 48 installed in the print head 2.

[0115] FIG. 14 is a diagram showing the voltage detected by the charge sensor 48, with the horizontal axis representing the specified elapsed time (phase) and the vertical axis representing the magnitude of the detected voltage. Whether the contamination of the print head 2 by ink 68A is acceptable is determined by the number of particles exceeding the threshold level SH within the specified elapsed time. In this embodiment, if there are zero particles exceeding the threshold level SH within the specified elapsed time (as in FIG. 14(a)), it is determined that there is no contamination. If there is one or more particles (as in FIG. 14(b)), it is determined that there is contamination. If it is determined that there is contamination, additional head cleaning is performed (solvent 69 is sprayed from the cleaning nozzle 72). If there are zero particles exceeding the threshold level SH within the specified elapsed time, it is determined that the amount of ink 68A adhering to the print head 2 is small and acceptable, and additional head cleaning is not performed.

[0116] Next, a method for determining the dryness state of the print head 2 in the head drying process will be described with reference to FIG.

[0117] In the inkjet recording apparatus 600 of the second embodiment, with the print head 2 set (mounted) in the head mounting unit 3, air is ejected from the air supply nozzle 73 to dry the solvent 69A adhering to the components (nozzle 21, charging electrode 23, deflection electrode 24, gutter 25, etc.) assembled to the print head 2, using the method described in FIGS. 9 and 10 of the first embodiment. When drying this solvent 69A, if the humidity around the head mounting unit 3 is high, the heat of vaporization of the solvent 69A may cause water droplets to adhere to the print head 2. Therefore, while the print head 2 is wet, a voltage (e.g., 1 to 7 kV) is applied to the deflection electrode 24 using the deflection voltage generation circuit 332. If a current flows when a voltage is applied to the deflection electrode 24, it can be detected by the charge sensor 48 assembled to the print head 2.

[0118] The dryness state of the print head 2 is determined using the charge sensor 48, similar to the ink contamination state determination, and details of this will be explained using FIG. 14. Whether the dryness state of the print head 2 is acceptable is determined by the number of particles exceeding the threshold level SH within a specified elapsed time. In this embodiment, if one or more particles exceed the threshold level SH within a specified elapsed time (the state shown in FIG. 14(b)), the print head 2 is determined to be insufficiently dry, and additional head drying is performed (air is sprayed from the air supply nozzle 73 of the head mounting unit 3 and solvent vapor is sucked through the hole 81C in the cleaning tank 71 to dry the print head 2). If no particles exceed the threshold level SH within a specified elapsed time (the state shown in FIG. 14(a)), the print head 2 is determined to have dried to an acceptable state, and additional head drying processing is not performed.

[0119] <Explanation of Head Cleaning Operation Flow in Example 2> Next, the operational flow of the head cleaning process of the inkjet recording apparatus 700 in the second embodiment will be described with reference to Fig. 15. Fig. 15 is a flowchart of the head cleaning process in the second embodiment.

[0120] 15, "step S201, steps S211 to S214, steps S221 to S224" are the same as "step S101, steps S111 to S114, steps S121 to S124" described in Fig. 13 of the first embodiment. Therefore, description of "step S201, steps S211 to S214, steps S221 to S224" will be omitted.

[0121] Step S231 is a head cleaning step, which is executed when "(d) Automatic Selection" is set in the (1) Head Cleaning Mode Selection field on the head cleaning related settings screen shown in Fig. 12. In the head mounting unit 3, a small amount (for example, 5 to 10 ml) of solvent 69A is sprayed from the cleaning nozzle 72 to clean the print head 2 (head cleaning process).

[0122] In step S232, a voltage is applied to the deflection electrode 24, and it is determined whether the charge sensor 48 detects a voltage exceeding the threshold level SH. If the voltage exceeds the threshold level SH, it is determined as "1", and if it does not, it is determined as "0".

[0123] In step S233, if the number of times that the binarized data in step S232 is judged to be "1" within a certain period of time is zero, it is determined that the ink contamination of print head 2 has been reduced to an acceptable level, and the process proceeds to step S241. If the number of times that the data is judged to be "1" is one or more, it is determined that the ink contamination of print head 2 has not been reduced to an acceptable level, and step S231 is executed again.

[0124] Step S241 is a head drying step, and is executed when "(d) Automatic" is set in the (2) Head Drying Time Setting field on the head cleaning related settings screen shown in Figure 12. The head mounting unit 3 executes a head drying process (air is sprayed from the air supply nozzle 73 of the head mounting unit 3 and solvent vapor is sucked in through the hole 81C in the cleaning tank 71 to dry the print head 2) for a predetermined time based on the type of solvent 69A and the values ​​detected by the temperature sensor A27 and the temperature sensor B80.

[0125] In step S242, a voltage is applied to the deflection electrode 24, and it is determined whether the charge sensor 48 detects a voltage exceeding the threshold level SH. If the voltage exceeds the threshold level SH, it is determined as "1", and if it does not, it is determined as "0".

[0126] In step S243, if the number of times that the binary conversion result in step S242 is judged to be "1" within a certain period of time is zero, it is determined that the print head 2 has dried to an acceptable level, and the process proceeds to step S251. If the number of times that the binary conversion result in step S242 is judged to be "1" is one or more, it is determined that the print head 2 has not dried to an acceptable level, and step S241 is executed again. Note that in the re-execution of step S241, for example, air may be continuously sprayed from the air supply nozzle 73 with the deflection voltage applied, and the process may proceed to step S251 when there are no more "1" judgments within a predetermined period of time.

[0127] In FIG. 15, "Steps S251 to S253" are the same as "Steps S151 to S153" explained in FIG. 13 of the first embodiment, and therefore explanation thereof will be omitted.

[0128] <Effects of Example 2> As described above, according to the second embodiment of the present invention, the inkjet recording device 600 can be provided with an inkjet recording device 600 that, by setting the print head 2 in the head mounting unit 3, can automatically determine the amount of contamination in the ink 68A of the print head 2 based on the amount of solvent 69A used, and can perform head cleaning until it is automatically determined that the ink contamination on the print head 2 has been removed.

[0129] Furthermore, according to the second embodiment of the present invention, an inkjet recording device 600 can be provided that can automatically determine the dry state of the print head 2 when the print head 2 is set in the head mounting unit, and can perform head drying until it is automatically determined that the print head 2 is dry.

[0130] Example 3

[0131] Next, an inkjet recording apparatus 600 according to a third embodiment of the present invention will be described. In the second embodiment, the same configuration as that shown in Figures 1 to 11 described in the first embodiment is also adopted. Therefore, the description of Figures 1 to 11 will be omitted. The following description will mainly focus on the operation flow of the third embodiment.

[0132] <Description of Stop Processing Operation Flow in Third Embodiment> Next, the operational flow of the operation shutdown process of the inkjet recording apparatus 600 in this embodiment will be described with reference to Fig. 16. Fig. 16 is a flowchart of the operation shutdown process in the third embodiment.

[0133] 16, first, in step S301, the start button for performing the operation shutdown process, which is displayed on the touch panel operation display unit 8, is pressed. Alternatively, the start button 18 provided on the head mounting unit 3 is pressed. The condition for pressing the start button for performing the operation shutdown process is that the inkjet recording apparatus 600 is in a state where power is being supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, and ink is being ejected from the nozzles 21 of the print head 2.

[0134] 16, "steps S311 to S314, steps S321 to S324" are the same as "step S101, steps S111 to S114, steps S121 to S124" described in Fig. 13 of the first embodiment. Therefore, the description of "steps S311 to S314, steps S321 to S324" will be omitted.

[0135] Step S331 is the ink ejection stopping step, in which processing is performed to stop the ejection of ink 68A from the nozzles 21 of the print head 2.

[0136] Step S332 is a nozzle cleaning step, in which solvent 69A is supplied to nozzles 21 of print head 2 via switching valve 26 to clean nozzles 21 from the inside.

[0137] 16, "steps S333 to S335, steps S341 to S343" are the same operations as "steps S231 to S233, steps S241 to S243" described in Fig. 15 of the second embodiment. Therefore, the description of "steps S333 to S335, steps S341 to S343" will be omitted.

[0138] 16, "steps S351 to S353" are the same operations as "steps S151 to S153" explained in Fig. 13 of the first embodiment. Therefore, explanation of "steps S351 to S353" will be omitted.

[0139] <Effects of Example 3> As described above, according to the third embodiment of the present invention, the inkjet recording device 600 can be provided in such a way that, by setting the print head 2 in the head mounting unit 3 while the inkjet recording device 600 is in operation (when ink 68A is being ejected from the nozzle 21), the inkjet recording device 600 can automatically perform a series of processes, including an ink ejection stop process (a process of stopping the ejection of ink 68A from the nozzle 21), a nozzle cleaning process (a process of ejecting solvent 69A from the nozzle 21 to clean the inside of the path), and a head cleaning process (a process of ejecting solvent 69A from the cleaning nozzle 72 to clean the print head 2 from the outside).

[0140] Example 4

[0141] Next, an inkjet recording apparatus 600 according to a fourth embodiment of the present invention will be described. This fourth embodiment also employs the same configuration as that shown in Figures 1 to 11 described in the first embodiment. Therefore, the description of Figures 1 to 11 will be omitted. The fourth embodiment will be described mainly using Figures 17 to 20.

[0142] <Phase Search Method of Example 4> The phase search method of the inkjet recording apparatus 600 in this embodiment will be described. FIG. 17 is a time chart showing the phase relationship between the excitation signal and the phase search charging voltage. In FIG. 17, (a) is an excitation signal that serves as a reference for particle formation as an example of detecting the timing of charging voltage application. (b) is an enlarged view of one cycle of the excitation signal. (c) is a charging waveform at each phase when one cycle of the excitation signal is divided into eight and a charging signal for half a cycle starting from each phase is applied.

[0143] In the inkjet recording apparatus 600, in order to detect the optimal timing for applying the charging voltage, when printing is not being performed (such as during an interval between printings), a charging voltage is applied to the ink droplets 68B1 that does not cause the ink droplets 68B1 to jump over the gutter 25 by shifting the charging phase with respect to the excitation signal that serves as the basis for particle formation, and the amount of minute charging charge 68B2 at each phase is detected. In other words, a charging voltage for phase search is generated to perform phase search.

[0144] To generate a phase search charging voltage for this phase search, a phase search charging signal generating circuit 341 (see FIG. 3) generates a charging signal for generating a plurality of types of phase search charging voltages with different phases relative to the excitation voltage. The phase search charging voltage is set to a magnitude that causes the ink droplet 68B1 charged by this charging voltage to be deflected to an extent that it does not jump over the gutter 25 (it can be captured by the gutter 25). A phase detection signal output from the charge sensor 48 in accordance with the amount of minute charge 68B2 of the ink droplet 68B1 charged by this charging voltage is input to a phase determination circuit 351 and an A / D converter 352 via an amplifier circuit 353.

[0145] The waveform of the phase detection signal output from the amplifier circuit 353 changes, for example, as shown in (a) to (c) of Fig. 18. When the inkjet recording apparatus 600 is in a normal state, the waveform of the phase detection signal changes as shown in Fig. 18(a) in accordance with a change in the generation phase of the phase search charging voltage.

[0146] The phase determination circuit 351 receives these phase detection signals, compares the received phase detection signals of each phase with a threshold level SH, and binarizes them, determining that those exceeding the threshold level SH are "1" and those not exceeding it are "0," and inputs the results to the MPU 301. The MPU 301 determines that the phase in which the binarized phase detection signal changes from "0" to "1" is the optimum phase for generating a charging voltage that charges the ink droplets 68B, and generates a printing charging signal so that the subsequent printing charging voltage is generated at that phase.

[0147] When the inkjet recording apparatus 600 is in an abnormal state, the waveform of the phase detection signal becomes as shown in FIG. 18(b) or (c).

[0148] Figure 18(b) shows a state in which none of the signals exceed the threshold level and are judged to be "1." For example, there may be a case in which ink droplet 68B ejected from nozzle 21 deviates from its intended flight direction and cannot be collected by gutter 25, resulting in scattering (this phenomenon is called beam bending). In this state, charge sensor 48 cannot detect the charge signal of ink droplet 68B1, resulting in a phase detection signal waveform as shown in Figure 18(b).

[0149] Figure 18(c) shows a state in which all (8) signals exceed the threshold level and are judged to be "1." For example, if the print head 2 is contaminated with ink 68A and a deflection voltage (1 to 7 kV) is applied to the deflection electrode 24, voltage leakage will occur. Then, the charge sensor 48 will detect a voltage other than that of the ink particle 68B1 as noise, resulting in a phase detection signal waveform like that shown in Figure 18(c).

[0150] <Screen configuration of Example 4> The ink ejection start setting screen in the head mounting unit 3 of the inkjet recording apparatus 600 according to the fourth embodiment will be described with reference to Fig. 19. The screen of Fig. 19 is displayed on the operation display unit 8.

[0151] First, select either "(a) Ink ejection, (b) Head cleaning + ink ejection" in the "(1) Select method for starting ink ejection in head mounting unit" field on the screen for setting the start of ink ejection in head mounting unit 3. If "(a) Ink ejection" is selected, only the ink ejection process is performed without the head cleaning process. If "(b) Head cleaning + ink ejection" is selected, the ink ejection process is performed after the head cleaning process.

[0152] Next, select either "(c) Now, or (d) Scheduled date and time" in the "(2) Ink ejection start time setting" field on the screen for setting the start of ink ejection in the head mounting unit 3. If you select "(c) Now," the ink ejection start process will begin immediately in the head mounting unit when you press the "(f) Confirm" button. If you select "(d) Scheduled date and time," you can set the "year, month, day, hour, and minute" at which you want to start ink ejection in the head mounting unit.

[0153] Next, in the "(3) Number of retries when an error occurs" field on the ink ejection start setting screen in the head mounting unit, you can set the number of retries in the range of 0 to 5 in "(e) Number of times setting."

[0154] Then, after completing all the settings (1) to (3) on the setting screen for starting ink ejection in the head mounting unit, press either the "(f) Confirm" or "(g) Cancel" button. If the "(f) Confirm" button is pressed, the displayed settings (1) to (3) are overwritten in the control unit 7, and the next time start of ink ejection in the head mounting unit is executed, the settings will be reflected. If the "(g) Cancel" button is pressed, the displayed settings (1) to (3) are not overwritten in the control unit 7, and the next time start of ink ejection in the head mounting unit is executed, the settings (displayed on the screen) from when the "(f) Confirm" button was previously pressed will continue to be used.

[0155] <Explanation of the operation start flow of Example 4> Next, the operational flow of the operation start (ink ejection start) process of the inkjet recording apparatus 600 in this embodiment will be described with reference to Fig. 20. Fig. 20 is a flowchart of the operation start process in the fourth embodiment.

[0156] 20, first, in step S401, the start button for performing the operation start (ink ejection start) process displayed on the operation display unit 8 is pressed. Alternatively, the start button 18 provided on the head mounting unit 3 is pressed. The conditions under which the start button for performing the operation start (ink ejection start) process is valid are that ink ejection from the nozzles 21 of the print head 2 of the inkjet recording apparatus 600 has stopped, and that power is not being supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, and the ink circulation system components are not operating.

[0157] 20, "steps S411 to S414, steps S421 to S424" are the same operations as "steps S111 to S114, steps S121 to S124" described in Fig. 13 of the first embodiment. Therefore, the description of "steps S411 to S414, steps S421 to S424" will be omitted.

[0158] In step S431, if the setting in the "(2) Ink ejection start time setting field" on the ink ejection start setting screen in the head mounting unit shown in Figure 19 is "(c) Now", proceed to step S441, and if it is "(d) Scheduled date and time", set the date and time when the next ink ejection will start and proceed to step S432.

[0159] In step S432, the inkjet recording device 600 waits in a resting state (ink ejection from the nozzles 21 of the print head 2 has stopped, and power is not supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, and the ink circulation system components are not operating) until the date and time set in step S431 arrives.

[0160] In step S433, it is checked whether the date and time set in step S431 has arrived, and if the set reservation time has arrived, the answer is "YES" and the process proceeds to step S441. If the set reservation time has not arrived, the answer is "NO" and step S432 is executed again.

[0161] In step S441, if the setting in the "(1) Ink ejection start method selection field in the head mounting unit" on the setting screen for starting ink ejection in the head mounting unit shown in Figure 19 is "(a) Ink ejection", proceed to step S451; if it is "(b) Head cleaning + ink ejection", set the date and time when the next ink ejection will start and proceed to step S442.

[0162] In step S442, "steps S231 to S233 and steps S241 to S243" described with reference to FIG. 19 in the second embodiment are performed.

[0163] In step S451, the ink droplets 68B start to be ejected from the nozzle 21. The charging electrode 23 applies a charge for phase search to the ink droplets 68B, and the charge sensor 48 detects the signal. Then, the deflection electrode 24 applies a deflection voltage (1 to 7 kV).

[0164] In step S452, as explained in FIG. 18, the phase detection data is detected by the charge sensor 48, and is binarized to "1" if it exceeds the threshold level SH, and "0" if it does not.

[0165] In step S461, the number of "1"s determined to be "1" per cycle (8 phases) binarized in step S452 is counted to see if there is one or more "1"s. If there is one or more phases, the result is determined to be "YES" (ink particle 68B is captured by gutter 25), and the process proceeds to step S481. If the "1" is a 0 phase, the result is determined to be "NO" (ink particle 68B is not captured by gutter 25), and the process proceeds to step S462.

[0166] In step S462, since an abnormality has been detected, ink ejection from the nozzles 21 is stopped.

[0167] In step S463, the number of times (e.g., two times) entered in "(e) Number of times setting" is confirmed in the (3) Number of retries when an abnormality occurs field on the ink ejection start setting screen in the head mounting unit shown in Fig. 19. If the number of times ink ejection has stopped in S462 is less than or equal to the number of times (e.g., two times) entered in "(e) Number of times setting", step S442 is executed again. If the number of times ink ejection has stopped in S462 is greater than the number of times (e.g., two times) entered in "(e) Number of times setting", the process proceeds to step S471.

[0168] In step S471, after the head cleaning process is executed, an abnormality confirmation message is displayed on the operation display unit 8 of the main body 1 or the display unit 20 of the head mounting unit 3 to notify that the operation start (ink ejection start) process has failed.

[0169] In step S472, the inkjet recording device 600 stops ejecting ink from the nozzles 21 of the print head 2, and no power is supplied to ink circulation system components such as the pump (supply) 34 and solenoid valve (supply) 49, so the inkjet recording device 600 waits in an inactive state.

[0170] In step S481, the number of "1"s determined to be "1" per cycle (8 phases) binarized in step S452 is counted, and a check is made to see if there are 7 or fewer "1"s. If there are 7 or fewer phases, the result is determined to be "YES" (the print head 2 is not very dirty), and the process proceeds to step S482. If there are 8 or more phases with "1"s, the result is determined to be "NO" (the print head 2 is very dirty), and the process proceeds to step S462.

[0171] Step S482 indicates that ink is ejected from the nozzle 21 of the print head 2, ink particles 68B are captured by the gutter 25, normal charging phase search is being performed, and the start-of-operation (ink ejection start) process is completed.

[0172] <Effects of Example 4> As described above, according to the fourth embodiment of the present invention, the inkjet recording device 600 performs the start-up process (ink ejection start) with the print head 2 set in the head mounting unit 3, so that even if beam bending occurs (such as ink particles 68B ejected from the nozzle 21 not entering the gutter 25 and soiling the print head 2 with ink), it is possible to provide an inkjet recording device 600 that prevents a situation in which the equipment around the print head 2 is soiled.

[0173] Furthermore, according to the fourth embodiment of the present invention, the inkjet recording device 600 performs the start-up process (starts ink ejection) with the print head 2 set in the head mounting unit 3, so that even if beam bending occurs, an inkjet recording device 600 can be provided that can automatically perform repair processes such as head cleaning.

[0174] Example 5

[0175] Next, an inkjet recording apparatus 600 according to a fifth embodiment of the present invention will be described. This fifth embodiment also employs the same configuration as that shown in FIGS. 1 to 11 described in the first embodiment. Therefore, a description of FIGS. 1 to 11 will be omitted. Furthermore, a description of parts common to the first to fourth embodiments will be omitted. The fifth embodiment will be described mainly using FIGS. 21 to 25.

[0176] <Operation and liquid flow> First, the operation when ink circulation is being performed in the main body 1 and print head 2 with the print head 2 set in the head mounting unit 3 will be described with reference to Figures 21 to 23. Figure 21 is a fluid path diagram showing the flow of liquid with bold lines when ink circulation is being performed in the main body in Example 5. Figure 22 is a fluid path diagram showing the flow of liquid and gas with bold lines when ink circulation is being performed in the main body and print head in Example 5. Figure 23 is a diagram showing the flow of ink when nozzle cleaning and circulation path cleaning are being performed in Example 5.

[0177] Figure 21 is a fluid path diagram showing the flow of liquid with thick lines (C1 to C2) when the inkjet recording device 600 in Example 5 is in a state where the print head 2 is set in the head mounting unit 3 and ink circulation is occurring within the main body 1.

[0178] In the main body 1, the solenoid valve (for supply) 49 and the solenoid valve (for circulation in the main body) 58 are energized to open the flow path, and the pump (for supply) 34 and the pump (for recovery) 35 are operated, so that the ink 68A contained in the ink container 31 of the main body 1 passes through the solenoid valve (for supply) 49, the pump (for supply) 34, the filter (for supply) 39, the pressure regulating valve 46, the pressure sensor 47, the solenoid valve (for circulation in the main body) 58, the pump (for recovery) 35, and returns to the ink container 31, as shown by the thick line of the arrow C1, thereby circulating the ink 68A.

[0179] In addition, in the main body 1, when the solenoid valve (for viscosity measurement) 57 is energized to open the flow path and operate the pump (for circulation) 36, as shown by the thick line of arrow C2, the ink 68A stored in the ink container 31 of the main body 1 passes through the viscosity measuring device 45, the solenoid valve (for viscosity measurement) 57, and the pump (for circulation) 36, and returns to the ink container 31, thereby circulating the ink 68A. Also, if the viscosity of the ink 68A is measured using the viscosity measuring device 45 at the timing of the ink circulation in the main body 1, it becomes easier to understand the state of the ink 68A the next time it is used.

[0180] Next, Figure 22 is a fluid path diagram showing the flow of liquid with thick lines (D1 to D7) when the inkjet recording device 600 in this embodiment is in a state where the print head 2 is set in the head mounting unit 3 and ink circulation is occurring in the main body and the print head.

[0181] In the ink supply paths (paths 801 to 804), the solenoid valve (for supply) 49 is energized to open the flow path, the switching valve 26 is energized to connect the ink supply path to the nozzles 21, and by operating the pump (for supply) 34, as shown by the thick line of arrow D1, ink 68A contained in the ink container 31 of the main body 1 is supplied to the nozzles 21 of the print head 2 and ejected from the nozzles 21 as ink droplets 68B. A voltage is applied to the ink droplets 68B by the charging electrode 23, and the amount of charge thereof is confirmed by the charge sensor 48.

[0182] In the ink recovery paths 811-812, when the solenoid valve (for recovery) 50 is energized to open the flow path and operate the pump (for recovery) 35, ink particles 68B and air around the print head 2 are sucked through the gutter 25 and sucked and pressure-fed into the ink container 31 of the main body 1, as indicated by the bold line of arrow D2. In the ink recovery paths 811-812, the ink 68A and air flow in a gas-liquid mixture, so the solvent component of the ink 68A dissolves in the air, and the air becomes a solvent gas that flows into the ink container 31. The ink that flows into the ink container 31 is collected at the bottom, and the air that has become a solvent gas is discharged to the outside of the main body 1 as a solvent gas, as indicated by the bold line of arrow D3.

[0183] In the inkjet recording apparatus 600, the solvent components in the ink 68A are discharged outside the apparatus as solvent gas. Therefore, as the operating time increases, the ratio of the solvent components in the ink 68A decreases, resulting in a high ink concentration. Conversely, as the operating time decreases, the ink concentration decreases due to the solvent 69A that flows into the ink container 31 during a nozzle cleaning process or other process. Therefore, in paths (for viscosity measurement) 824 and 822, the solenoid valve (for viscosity measurement) 57 is energized to open the flow path, and the pump (for circulation) 36 is operated. This sends the ink 68A from the ink container 31 to the viscosity measuring device 45, as indicated by the bold arrow D5, and periodically measures the viscosity (converted to concentration) of the ink 68A. The measured viscosity value is input to the control unit 7. As a result, when the concentration of ink 68A is low, the control unit 7 controls the ink container 31 to be replenished with ink 68C from the auxiliary ink container 32, and when the concentration of ink 68A is high, the control unit 7 controls the ink container 31 to be replenished with solvent 69A from the solvent container 33, as indicated by the thick line of arrow D7. In this way, the inkjet recording apparatus 600 controls the viscosity of the ink 68A to fall within the range of the management value.

[0184] In addition, in ink circulation paths 821-822, when ink 68A is supplied from ink container 31 to nozzle 21 as shown by the bold line of arrow D1, solenoid valve (for circulation) 59 is energized to open the flow path and pump (for circulation) 36 is operated, so that at least a portion of the ink 68A supplied to nozzle 21 is sucked into pump (for circulation) 36 and circulates the ink 68A back to ink container 31 as shown by the bold line of arrow D3. In addition, before switching valve 26 is energized, solenoid valve (for main body circulation) 58 is energized to open the flow path and pump (for circulation) 36 is operated, so that ink 68A can also be circulated through path (for main body circulation) 808 as shown by the bold line of arrow D6.

[0185] Next, Figure 23 is a diagram showing the ink flow with thick lines (E1 to E7) when the inkjet recording device 600 in Example 5 is in a state where the print head 2 is set in the head mounting unit 3 and nozzle cleaning and circulation path cleaning are being performed.

[0186] In the nozzle cleaning paths (paths 831 and 835), the solenoid valve (for nozzle cleaning) 55 is energized to open the flow path, and the pump (for solvent) 37 is operated, so that, as indicated by the bold line of arrow E1, solvent 69A stored in the solvent container 33 of the main body 1 is supplied to the print head 2 and ejected from the nozzles 21. In the ink recovery paths 811-812, the solenoid valve (for recovery) 50 is energized to open the flow path, and the pump (for recovery) 35 is operated, so that the solvent 69A ejected from the nozzles 21 is captured by the gutter 25 and recovered in the ink container 31, as indicated by the bold line of arrow E1.

[0187] In the ink circulation paths 821-822, with the solvent 69A being supplied from the solvent container 33 to the nozzles 21 as indicated by the bold line of the arrow E1, the solenoid valve (for circulation) 59 is energized to open the flow path and operate the pump (for circulation) 36, so that at least a portion of the solvent 69A supplied to the nozzles 21 is sucked into the pump (for circulation) 36 and recovered into the ink container 31 as shown by the bold line of the arrow E3. In this way, the inkjet recording apparatus 600 can use the solvent 69A to clean the nozzles 21, the ink paths (for recovery) 811-812, and the paths (for ink circulation) 821-822.

[0188] Furthermore, after the cleaning of the paths (nozzles 21 and ink recovery paths 811-812, ink circulation paths 821-822) is completed, in the main body 1, the solenoid valve (for supply) 49 and the solenoid valve (for circulation in the main body) 58 are energized to open the flow path, and the pump (for supply) 34 and the pump (for recovery) 35 are operated to circulate the ink 68A contained in the ink container 31 of the main body 1, as shown by the thick line of the arrow E7.

[0189] Furthermore, in the main body 1, the solenoid valve (for viscosity measurement) 57 is energized to open the flow path and operate the pump (for circulation) 36, thereby supplying the ink 68A contained in the ink container 31 of the main body 1 to the viscosity measuring device 45, as shown by the thick line of the arrow E6, and at the timing of the ink circulation within this main body 1, the viscosity of the ink 68A is measured using the viscosity measuring device 45 so that the state of the ink 68A can be known the next time it is used.

[0190] <Screen configuration of Example 5> An ink circulation function setting screen for when the head mounting unit of the inkjet recording apparatus 600 according to the fifth embodiment is stopped for a long period of time will be described with reference to Fig. 24. The screen of Fig. 24 is displayed on the operation display unit 8.

[0191] First, enter "(a) what time and minute" in the "(1) Ink circulation start time setting field" on the screen for setting the ink circulation function when the head mounting unit is stopped for a long period of time.

[0192] Next, in the "(2) Number of retries when an abnormality occurs setting field" on the ink circulation function setting screen for when the head mounting unit is stopped for a long period of time, you can set the "(b) Number of times setting" in the range of 0 to 5.

[0193] Next, select either "(c) No, or (d) Scheduled date and time" in the "(3) Next startup date and time reservation field" on the screen for setting the ink circulation function when the head mounting unit is stopped for a long period of time. If you set it to "(c) No," the ink circulation function when the head mounting unit is stopped for a long period of time will be executed, but the startup process (start of ink ejection) will not be carried out at the specified time. If you select "(d) Scheduled date and time," you can set the "year, month, day, hour, and minute" at which you want to start ejecting ink in the head mounting unit.

[0194] Then, after completing all the settings (1) to (3) on the ink circulation function setting screen for when the head mounting unit is stopped for a long period of time, press either the "(e) Confirm" or "(f) Cancel" button. If the "(e) Confirm" button is pressed, the displayed settings (1) to (3) are overwritten in the control unit 7, and the ink circulation function for when the head mounting unit is stopped for a long period of time is started. If the "(f) Cancel" button is pressed, the displayed settings (1) to (3) are not overwritten in the control unit 7, and the ink circulation function for when the head mounting unit is stopped for a long period of time is not started.

[0195] <Explanation of Ink Circulation Start Flow During Long-Term Operation Stoppage in Example 5> Next, the operational flow of ink circulation start processing when the inkjet recording apparatus 600 in this embodiment is stopped for a long period of time will be described with reference to Fig. 25. Fig. 25 is a flowchart of ink circulation when the inkjet recording apparatus 600 in this embodiment is stopped for a long period of time.

[0196] 25, first, in step S501, a start button for performing ink circulation start processing during a long-term shutdown, which is displayed on the touch panel operation display unit 8, is pressed. The start button for performing ink circulation start processing during a long-term shutdown is enabled when the inkjet recording apparatus 600 has stopped ejecting ink from the nozzles 21 of the print head 2, and when no power is being supplied to ink circulation system components such as the pump (for supply) 34 and the solenoid valve (for supply) 49, and the ink circulation system components are not operating.

[0197] 25, "steps S511 to S514, steps S521 to S524" are the same as "steps S111 to S114, steps S121 to S124" described in Fig. 13 of the first embodiment. Therefore, description of "steps S511 to S514, steps S521 to S524" will be omitted.

[0198] In step S531, it is confirmed that the contents of "(d) Date and time reservation" have been set in the "(3) Next startup date and time reservation field" on the setting screen for the ink circulation function during long-term stoppage in the head mounting unit shown in FIG. 24. If the set reservation time has arrived, the process judges "YES" and proceeds to step S532. If the set reservation time has not arrived, the process judges "NO" and proceeds to step S541. Note that if the content set in the (3) Next startup date and time reservation field shown in FIG. 24 is "(c) No," the process also judges "NO" and proceeds to step S541.

[0199] In step S541, the setting of "(a) What time and minute" is confirmed in the "(1) Ink circulation start time setting field" on the ink circulation function setting screen for long-term stoppage in the head mounting unit shown in Fig. 24. The inkjet recording apparatus 600 waits in a paused state (ink ejection from the nozzles 21 of the print head 2 has stopped, and power is not supplied to ink circulation system components such as the pump (for supply) 34 and solenoid valve (for supply) 49, and they are not operating) until the set time has elapsed.

[0200] In step S542, the ink circulation within the main body 1 described with reference to FIG. 21 is carried out.

[0201] In step S543, the same process as in S541 is executed.

[0202] In step S544, since the time confirmed in step S541 has arrived, ink ejection processing is started.

[0203] In step S551, "steps S441 to S442, steps S451 to S452, steps S461 to S463, steps S71 to S472, and steps S481 to S482" described with reference to FIG. 20 in the fourth embodiment are performed.

[0204] In step S552, the ink circulation in the main body 1 and the print head 2 described with reference to FIG. 22 is carried out.

[0205] In step S561, the viscosity of the ink 68A is measured using the viscosity measuring device 45. The ink density is calculated based on the relationship between temperature and viscosity for each ink type recorded in the control unit .

[0206] In step S562, it is determined whether the ink density calculated in step S561 is higher than a predetermined threshold. If it is higher than the threshold, the determination is "YES" and the process proceeds to step S571. If it is lower than the threshold, the determination is "NO" and step S552 is executed again. In the inkjet recording apparatus 600, the ink density of the ink 68A can be increased by performing the ink circulation described with reference to FIG. 22.

[0207] In step S571, the switching valve 26 is de-energized, thereby stopping the ejection of ink from the nozzles 21.

[0208] In step S572, the nozzle cleaning and circulation path cleaning described with reference to FIG. 23 are performed, and step S531 is executed again.

[0209] In step S532, "steps S441 to S442, steps S451 to S452, steps S461 to S463, steps S71 to S472, and steps S481 to S482" described with reference to FIG. 20 in the fourth embodiment are performed.

[0210] Step S533 indicates that ink is ejected from the nozzle 21 of the print head 2, ink particles 68B are captured by the gutter 25, normal charging phase search is being performed, and the start-of-operation (ink ejection start) process is completed.

[0211] <Effects of Example 5> As described above, according to the fifth embodiment of the present invention, the inkjet recording device 600 can be provided such that, when the print head 2 is set (mounted) in the head mounting unit 3 and the ink circulation system components are not used for an extended period of time, the ink circulation in the main body 1 and the print head 2 is automatically started after a certain period of time has elapsed in order to prevent adhesion of the ink circulation system components, and if a problem such as beam bending occurs, the problem is automatically repaired and the ink circulation in the main body 1 and the print head 2 is resumed again after a certain period of time has elapsed.

[0212] Furthermore, according to the fifth embodiment of the present invention, an inkjet recording device 600 can be provided that automatically circulates ink in the main body 1 and the print head 2 after a certain period of time has elapsed until the scheduled start date and time of operation (start of ink ejection), thereby reducing malfunctions at the start of operation.

[0213] Other Examples

[0214] Although Examples 1 to 5 have been described above, the present invention is not limited to the above-described Examples and includes various modifications. Furthermore, the above-described Examples have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the described configurations. [Explanation of symbols]

[0215] 1...Main body, 2...Print head, 3...Head mounting unit, 4...Collection container, 5...Cable (for print head), 6...Cable (for head mounting unit), 7...Control unit, 8...Operation display unit, 11...Belt conveyor, 12A...Printing target, 12B...Printing target, 13...Print head fixing bracket, 16...Head base, 17...Protective cover, 18...Start button, 19...Stop button, 20...Display unit, 21...Nozzle, 23...Charged electrode, 24...Deflection electrode, 24A...Positive electrode, 24B...Ground electrode, 25...Gutter, 26...Switching valve, 27...Temperature sensor A, 28...Magnetic sensor C, 28 A...electric wire, 31...ink container, 31A...liquid level sensor, 32...auxiliary ink container, 33...solvent container, 34...pump (supply), 35...pump (recovery), 36...pump (circulation), 37...pump (for solvent), 39...filter (supply), 40...filter (recovery), 41...filter (for nozzle cleaning), 43...filter (for head cleaning), 45...viscosity meter, 46...pressure adjustment valve, 47...pressure sensor, 48...charge sensor, 49...solenoid valve (supply), 50...solenoid valve (recovery), 53...solenoid valve (for solvent replenishment), 54...solenoid valve (for ink replenishment), 55...solenoid valve (nozzle cleaning) cleaning), 56... solenoid valve (for head cleaning), 57... solenoid valve (for viscosity measurement), 58... solenoid valve (for main body circulation), 59... solenoid valve (for circulation), 60... pump (for drying), 61... pump (for suction), 62... exhaust duct connection part, 68A... ink, 68B... ink particles, 68B1... ink particles, 68B2... charged charges, 68C... ink, 69A... solvent, 70... liquid, 71... cleaning tank, 71A... mounting part, 72... cleaning nozzle, 72A... liquid discharge hole A part, 72B... liquid discharge hole B part, 73... air supply nozzle, 73A... air discharge hole, 74... float, 75... magnet A, 76... magnetic sensor A, 76A ...electric wire, 77...container, 77A...mounting portion, 77B...liquid storage portion, 77C...internal thread portion, 78...partition, 78A...liquid inlet hole portion, 78B...liquid outlet hole portion, 79...holder, 80...temperature sensor B, 80A...electric wire, 81...cleaning block, 81A...head mounting portion, 81B...head insertion portion, 81C...hole portion, 81D...flow path A portion, 81E...flow path B portion, 81F...flow path C portion, 82...lid hinge, 83...lid member, 84...magnetic sensor B, 84A...electric wire, 85...cover, 86...magnet B, 87...magnet C, 88...suction joint, 88A...chamber, 88B...joint A portion, 88C...joint B portion, 89...liquid joint,90...Air joint, 91...Fixing part, 92...Fixing jig (for conveyor), 93...Mating part, 301...MPU, 302...Bus line, 306...ROM, 307...RAM, 311...Viscosity measurement circuit, 312...Pressure detection circuit, 313...Liquid level detection circuit, 314...Pump control circuit, 315...Solenoid valve drive circuit, 321...Air pump control circuit, 322...Recovery container sensor detection circuit, 323...Print head detection circuit, 324...Head mounting unit detection circuit, 331...Excitation voltage generation circuit, 332...Deflection voltage generation circuit, 341...Phase search charge signal generation circuit, 342...Print charge signal generation circuit, 343...D / A converter, 344... Amplification circuit, 351...phase determination circuit, 352...A / D converter, 353...amplification circuit, 600...inkjet recording device, 801 to 804...path (for supply), 806...path (for replenishment), 808...path (for circulation in main body), 811 to 812...path (for recovery), 814...path (for exhaust), 821 to 822...path (for circulation in head), 824...path (for viscosity measurement), 831...path (for solvent supply), 833...path (for solvent replenishment), 835...path (for nozzle cleaning), 837...path (for head cleaning), 841...path (for air supply), 843...path (for air suction), 901 to 903...merging path, 921 to 922...branching path,

Claims

1. a print head having a nozzle for discharging ink in droplets, a charging electrode for charging the ink droplets discharged from the nozzle, a deflection electrode for deflecting the ink droplets charged by the charging electrode, and a gutter for collecting the ink droplets; a main body having an ink supply path that supplies the ink in an ink container to the nozzle, an ink recovery path that recovers the ink particles recovered by the gutter into the ink container, and a solvent supply path that supplies a solvent in a solvent container; a head mounting unit for mounting the print head, The head mounting unit includes: when a process for stopping the operation of the inkjet recording device is received from a user, an ink ejection stop process is executed to stop the ejection of the ink droplets at a timing when it is detected that the print head has been attached to the head attachment unit while the ink droplets are being ejected from the nozzles; performing a cleaning process for the print head while the ejection of the ink droplets is stopped and the print head is still attached, and performing a drying process for the print head after the cleaning process is completed; The inkjet recording apparatus includes: After the drying process is performed, the power is turned off. The head mounting unit includes: An inkjet recording device that automatically performs a series of processes, including a process for stopping ink ejection, a process for cleaning the print head, and a process for drying the print head, by mounting the print head on the head mounting unit while the ink droplets are being ejected from the nozzles.

2. The print head includes:

2. The inkjet recording apparatus according to claim 1, wherein the ink droplets are ejected from the nozzles in a state where the print head is mounted on the head mounting unit before the cleaning process.

3. The print head includes: The inkjet recording apparatus according to claim 2 , wherein the ink ejected from the nozzles is switched to the solvent while the print head is mounted on the head mounting unit.

4. The head mounting unit includes: an air outlet for discharging air to dry the print head; An inkjet recording apparatus according to any one of claims 1 to 3, wherein when "turn off" the power supply is selected on the setting screen, the power supply of the inkjet recording apparatus is turned off after the cleaning process and the drying process are performed.

5. The head mounting unit includes: An inkjet recording apparatus according to any one of claims 1 to 4, further comprising: a recovery container for storing the solvent used in the cleaning process; and a recovery container attachment detection unit for detecting that the recovery container is attached to the head attachment unit.

6. The head mounting unit includes:

6. The inkjet recording apparatus according to claim 5, further comprising a liquid amount detector that detects whether the amount of the solvent contained in the recovery container reaches a predetermined amount or more.

7. The head mounting unit includes:

7. The inkjet recording apparatus according to claim 1, further comprising a head installation detection unit that detects whether the print head is installed.

8. The body includes: further comprising an operation display unit that displays information about the inkjet recording device, The operation display unit includes: displaying a setting screen for setting whether to "turn off" or "not turn off" the power supply of the inkjet recording apparatus after the cleaning process is completed; An inkjet recording apparatus according to any one of claims 1 to 7, wherein, when "Turn off" the power supply is selected on the setting screen, the power supply of the inkjet recording apparatus is turned off after the cleaning process is completed.

9. The setting screen is The inkjet recording apparatus according to claim 8 , wherein the message is displayed before the cleaning process of the print head is performed.

10. a print head having a nozzle for discharging ink in droplets, a charging electrode for charging the ink droplets discharged from the nozzle, a deflection electrode for deflecting the ink droplets charged by the charging electrode, and a gutter for recovering the ink; a main body having an ink supply path that supplies the ink in an ink container to the nozzle, an ink recovery path that recovers the ink recovered by the gutter into the ink container, and a solvent supply path that supplies a solvent in a solvent container; a head mounting unit for mounting the print head, The head mounting unit includes: when a process for stopping the operation of the recording device is received from a user, an ink ejection stop process is executed to stop the ejection of the ink droplets at a timing when it is detected that the print head has been attached to the head attachment unit while the ink droplets are being ejected from the nozzles; performing a cleaning process for the print head while the ejection of the ink droplets is stopped and the print head is still attached, and performing a drying process for the print head after the cleaning process is completed; The recording device After the drying process is performed, the power is turned off. The head mounting unit includes: A recording device that automatically performs a series of processes, including a process for stopping ink ejection, a process for cleaning the print head, and a process for drying the print head, by mounting the print head on the head mounting unit while the ink droplets are being ejected from the nozzles.

11. The print head includes:

11. The recording apparatus according to claim 10, wherein the ink droplets are ejected from the nozzles in a state where the print head is attached to the head attachment unit before the cleaning process.

12. The print head includes: The recording apparatus according to claim 11 , wherein the ink ejected from the nozzles is switched to the solvent while the print head is attached to the head mounting unit.

13. The head mounting unit includes: an air outlet for discharging air to dry the print head; The recording device according to any one of claims 10 to 12, wherein when "turn off" is selected on the setting screen, the power supply of the recording device is turned off after the cleaning process and the drying process are performed.

14. The head mounting unit includes: A recording device according to any one of claims 10 to 13, further comprising: a recovery container for storing the solvent used in the cleaning process; and a recovery container attachment detection unit for detecting that the recovery container is attached to the head attachment unit.

15. The head mounting unit includes:

15. The recording apparatus according to claim 14, further comprising a liquid amount detector that detects whether the amount of the solvent contained in the recovery container reaches a predetermined amount or more.

16. The head mounting unit includes:

16. The recording apparatus according to claim 10, further comprising a head installation detection unit that detects whether the print head is installed.

17. The body includes: further comprising an operation display unit that displays information about the recording device; The operation display unit includes: displaying a setting screen for setting whether to "turn off" or "not turn off" the power supply of the recording device after the cleaning process is completed; The recording device according to any one of claims 10 to 16, wherein when "turn off" is selected on the setting screen, the power to the recording device is turned off after the cleaning process is completed.

18. The setting screen is The recording device according to claim 17 , wherein the message is displayed before the cleaning process of the print head is performed.

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