WO2023032442A1 - インクジェット記録装置及びインクジェット記録装置の管理方法 - Google Patents
インクジェット記録装置及びインクジェット記録装置の管理方法 Download PDFInfo
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- WO2023032442A1 WO2023032442A1 PCT/JP2022/025597 JP2022025597W WO2023032442A1 WO 2023032442 A1 WO2023032442 A1 WO 2023032442A1 JP 2022025597 W JP2022025597 W JP 2022025597W WO 2023032442 A1 WO2023032442 A1 WO 2023032442A1
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- ink
- print head
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/195—Ink jet characterised by ink handling for monitoring ink quality
Definitions
- the present invention relates to an inkjet recording apparatus and an inkjet recording apparatus management method.
- an inkjet recording device for printing characters and figures on products conveyed by a conveying device in a production line, or marking them, the ink is printed without the nozzles of the print head coming into contact with the substrate.
- a non-contact type is used in which the droplets are projected from a nozzle toward an object.
- the outer surface of the packaging material is printed by an inkjet recording device while being conveyed by a conveyor.
- the outer surface of the container is printed while being transported by a conveyor.
- the print head of such an inkjet recording apparatus is provided with a charging electrode that charges the ink particles ejected from the nozzle with an amount of charge corresponding to the printing information, and a deflection electrode that deflects the charged ink particles.
- a gutter is placed opposite the nozzles to collect ink not used for printing.
- An ink supply path for supplying ink in the ink container is connected to the nozzle, and a recovery path for recovering the ink recovered by the gutter into the ink container is connected between the gutter and the ink container.
- a suction path is connected between the inflow part of the nozzle and the ink container in order to suck outside air into the nozzle and prevent clogging of the nozzle.
- a solvent supply path is connected between the solvent container and the nozzle for cleaning the nozzle and each path described above.
- the inkjet recording apparatus further has an apparatus main body in which an ink container, a solvent container, etc. are incorporated, and a print head is connected to the apparatus main body by conduits having pipes such as hoses that form respective paths. .
- Patent Document 1 describes "an ink container containing ink for printing on a printing object, and a nozzle connected to the ink container and ejecting the pressure-supplied ink. 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; a gutter that collects ink not used for printing; An inkjet recording apparatus comprising a container and a liquid nozzle connected to the solvent container and ejecting a solvent supplied under pressure, wherein the liquid nozzle is a liquid flow path portion extending from the nozzle in the gutter direction. and an ink jet recording apparatus characterized by having a liquid ejection hole formed at an angle such that the solvent supplied under pressure hits the nozzle through the liquid flow path.
- Patent Document 2 describes "an ink container containing ink for printing on a printing object, a nozzle connected to the ink container from which the pressure-supplied ink is ejected, and a nozzle from the nozzle.
- a charging electrode that charges ejected ink particles
- a charging signal generator that generates a charging signal that charges the charging electrode
- a deflection electrode that deflects the ink particles charged by the charging electrode
- ink that is not used for printing and a control section for controlling the overall operation, wherein the first ink jet recording apparatus detects the amount of charge due to the charging of the ink particles between the charging electrode and the deflecting electrode.
- an ink jet recording apparatus comprising charge detection means and second charge detection means for detecting the charge amount of ink flowing in the gutter.
- Patent Document 3 describes "a nozzle for ejecting generated ink particles, a charging electrode for charging the ejected ink particles with a character or image signal, and a nozzle for deflecting the charged ink particles.
- a deflection electrode for detecting said ink particles not used in forming characters or images
- a main ink into which said ink particles trapped in said gutter are returned to recycle the ink in forming characters or images.
- liquid level detecting means for detecting the amount of ink liquid accumulated in the main ink tank, the liquid level detecting means being capable of detecting a plurality of liquid levels including upper, middle and lower levels, and an ink jet recording apparatus characterized in that the liquid surface level to be detected is selected in accordance with the environmental temperature.
- the ink or solvent is not discharged for a long time while the inkjet recording device is at rest, the ink that has accumulated in the circulation path will adhere, and even if the ink circulation is started when the device is started up, the ink will flow normally. It may disappear.
- the viscosity of the ink in the main ink container may change, and the viscosity may rise outside the appropriate viscosity range. It may become lower.
- Patent Documents 1 to 3 disclose the prevention of ink sticking when such a stopped state of the apparatus continues for a long time, and the prevention of ink sticking when the viscosity of the ink in the main ink container deviates from the proper viscosity range. , there is no mention of adjusting the viscosity of the ink so that it falls within an appropriate range.
- the present invention solves the above-described problems of the prior art, can prevent the ink from sticking during rest, and the viscosity of the ink in the main ink container has deviated from the appropriate viscosity range.
- the present invention provides an inkjet recording apparatus having a configuration capable of adjusting the viscosity of ink so that it falls within an appropriate range, and a method for managing the inkjet recording apparatus.
- the present invention provides a print head that is provided with nozzles for ejecting ink and prints on a printing object, an ink container that contains ink to be supplied to the print head, and a solvent that contains a solvent.
- a supply path for supplying ink from the ink container to the print head a circulation path equipped with a circulation pump for returning part of the ink supplied to the print head to the ink container;
- an inkjet recording apparatus comprising a mounting unit and a control section for controlling a print head and a main body
- the control section controls the ink viscosity measured by the viscosity measuring section when it is out of a predetermined range.
- the print head and main body are controlled so that the viscosity of the ink falls within a predetermined range.
- the present invention provides a print head that includes nozzles for ejecting ink and prints on a printing object, an ink container that stores ink to be supplied to the print head, and a solvent that stores a solvent.
- An inkjet recording apparatus comprising: a main body having a recovery path for recovering ink to an ink container; While printing is paused, the print head and main unit are controlled to supply the solvent contained in the solvent container to the print head and return it to the ink container through the circulation and recovery paths at regular intervals while the print head is not printing. It was configured to be repeated every
- the liquid can pass through the circulation path, and the effect of preventing sticking can be improved.
- an inkjet recording apparatus it has become possible to automatically adjust the viscosity of the ink in the main ink container, including when the viscosity is high and when the viscosity is low.
- FIG. 1 is a perspective view showing a usage situation of an inkjet recording apparatus in an example
- FIG. 1 is a path diagram showing a path configuration for flowing ink or solvent in an inkjet recording apparatus in an example
- FIG. 3 is a block diagram showing the configuration of a control section of the inkjet recording apparatus in the embodiment
- FIG. 5 is a flowchart of processing for preventing ink sticking in the inkjet recording apparatus in the example.
- FIG. 10 is a path diagram showing a path along which ink flows when measuring the viscosity of ink in the process for preventing ink sticking of the inkjet recording apparatus in the example.
- FIG. 1 is a perspective view showing a usage situation of an inkjet recording apparatus in an example
- FIG. 1 is a path diagram showing a path configuration for flowing ink or solvent in an inkjet recording apparatus in an example
- FIG. 3 is a block diagram showing the configuration of a control section of the inkjet recording apparatus in the embodiment
- FIG. FIG. 5 is
- FIG. 4 is a path diagram showing a path for supplying a solvent to the print head and recovering it in the process for preventing ink sticking of the inkjet recording apparatus in the embodiment;
- FIG. 4 is a path diagram showing a path for measuring the viscosity of ink while circulating ink in the main body in the process for preventing ink sticking of the inkjet recording apparatus in the example.
- FIG. 5 is a flowchart showing the flow of processing for adjusting the viscosity of the ink so that the viscosity of the ink in the ink jet recording apparatus according to the embodiment is within a certain range.
- FIG. 2 is a path diagram showing a path configuration in a state where the viscosity of ink is being measured in the inkjet recording apparatus according to the embodiment;
- FIG. 5 is a path diagram showing a path configuration in which ink is circulated through the print head in the process of adjusting the viscosity of the ink so that it falls within a certain range when the viscosity of the ink is high in the ink jet recording apparatus according to the embodiment; .
- FIG. 10 is a path diagram showing a path configuration in a state in which ink is discharged from the print head in the process of adjusting the viscosity of the ink so that it falls within a certain range when the viscosity of the ink is high in the inkjet recording apparatus according to the embodiment; .
- Path configuration in which solvent is supplied to the main ink container while circulating the ink in the process of adjusting the viscosity of the ink so that it falls within a certain range when the viscosity of the ink of the ink jet recording apparatus in the embodiment is high.
- It is a route diagram showing .
- 1 is a route diagram showing a route configuration of .
- FIG. 2 is a path diagram showing a path configuration in a state where an ink circulation path including a print head is being cleaned in the inkjet recording apparatus according to the embodiment;
- FIG. 2 is a path diagram showing a path configuration when the print head is thoroughly cleaned in the inkjet recording apparatus of the example.
- the main ink container is replenished with ink from the auxiliary ink container through the print head.
- FIG. 4 is a path diagram showing a path configuration in a state where viscosity of ink in an ink container is being measured;
- FIG. 5 is a front view of the operation display section showing an ink viscosity display area for displaying the initial value and the adjusted value of the ink viscosity in the embodiment.
- the solvent is supplied to the print head at regular intervals, and the solvent is ejected from the nozzles, thereby allowing the liquid to flow through the circulation path.
- the present invention enables the ink jet recording apparatus to automatically adjust the viscosity according to whether the viscosity is high or low when the viscosity of the ink is out of the predetermined range.
- the ink jet recording apparatus of the present invention when the viscosity of the ink exceeds a predetermined range, only part of the ink contained in the main ink container is discarded according to the viscosity of the ink. , the ink viscosity can be adjusted to an appropriate range, eliminating the need to discard all the ink in the main ink container and replacing it with new ink. It is designed to increase the amount of effective use.
- FIG. 1 is a perspective view showing how an inkjet recording apparatus is used in Example 1 of the present invention.
- the inkjet recording apparatuses 600A and 600B have the same configuration, and respectively include a main body 1, a print head 2 connected to the main body 1 by a cable (for the print head) 5, and a main body 1 and the cable (for the head). and a head mounting unit 3 connected by a mounting unit 6.
- the head mounting unit 3 basically has the function of housing the print head, but may additionally have the function of jetting a cleaning liquid to clean the print head.
- the head mounting unit 3 to be described below has a configuration in which a function for cleaning the print head is added.
- An inkjet recording device 600A shows a state in which the print head 2 is installed in the production line.
- the inkjet recording apparatus 600B shows a state in which the print head 2 is removed from the production line and mounted (set) on the head mounting unit 3 .
- a collection container 4 attached to the lower portion of the head mounting unit 3 is provided for containing the liquid (cleaning liquid) after the print head has been washed by the head mounting unit 3 .
- the inkjet recording apparatus 600A is installed, for example, on a production line in a factory where food and beverages are produced, and the main body 1 is installed in a place where the space required for regular maintenance work can be secured.
- the print head 2 is fixed to a print head fixing bracket 13 installed near the belt conveyor 11, and prints on printing objects 12A and 12B fed in the direction of the arrow X on the production line such as the belt conveyor 11. are placed in close proximity to A protective cover 17 is attached to the print head 2 for the purpose of protecting the parts inside the print head 2 .
- the print target 12B shows a state in which printing by the print head 2 is completed and the print target 12B is conveyed on the belt conveyor 11.
- the main body 1 contains (holds) ink for printing, and controls the driving parts (pumps and solenoid valves) inside the main body to supply the ink via a cable (for the print head) 5. Supply to print head 2 . Details of the path configuration inside the main body 1 and the control section will be described later.
- the operation display unit 8 is installed on the upper surface of the main body 1, and uses a touch input type display panel here. By touching the operation display unit 8, the operator instructs the control unit to start or stop the apparatus, set the content to be printed on the printing object 12A, or obtain information about the ink viscosity before and after adjustment. can be displayed. Further, in FIG. 1, 16 in the print head 2 indicates a head base.
- the head mounting unit 3 is installed around the print head 2 .
- the head mounting unit 3 in the inkjet recording apparatus 600A is fixed by combining a fixing jig 92 mounted on the belt conveyor 11 with a fitting portion 93 mounted on the head mounting unit 3 .
- the head mounting unit 3 has a head mounting portion 81A for mounting the print head 2 thereon.
- the head mounting unit 3 has a start button 18 for starting the cleaning process for the print head 2, a stop button 19 for stopping the cleaning process for the print head 2, and alarms such as confirmation messages, alarms, and abnormalities. and a display unit 15 for making the operator recognize it.
- the display unit 15 may allow the operator to recognize the operating state and the presence or absence of an abnormality by, for example, the presence or absence of light or the difference in color.
- the head mounting unit 3 is fixed near the belt conveyor 11, but the head mounting unit 3 can be freely replaced at a place where the user can easily operate.
- the length of the cable (for head mounting unit) 6 connecting the main body 1 and the head mounting unit 3 is the same as or longer than the cable 5 connecting the main body 1 of the inkjet recording apparatus 600 and the print head 2. is preferred. This is to ensure the degree of freedom in arranging the head mounting unit.
- the main body 1 has a fixing portion 91 for fixing the head mounting unit 3, and the head mounting unit 3 can be removed from the fixing jig (for conveyor) 92 and replaced with the fixing portion 91 for use. is also possible.
- the inkjet recording apparatus 600B shows such a state.
- the head mounting unit 3 is fixed to the main body 1 by combining the fixing part 91 assembled to the main body 1 with the fitting part 93 .
- the head mounting unit 3 can be installed even when there is no space for mounting the head mounting unit 3 in the vicinity of the belt conveyor 11 or the like.
- the print head 2 is set in the head mounting unit 3 in the inkjet recording apparatus 600B.
- the print head 2 is mounted and set in the head mounting portion 81A of the head mounting unit 3 from the tip of the print head 2 .
- the ink jet recording apparatus 600B in this embodiment prints with the solvent 69A supplied from the main body 1 side through the cable (for the head mounting unit) 6. Head 2 can be washed.
- printing is similarly performed in a state in which the print head 2 is set in the head mounting unit 3 fixed by combining the fixing jig 92 assembled to the belt conveyor 11 with the fitting portion 93. Head 2 can be washed.
- FIG. 2 is a diagram showing the overall path configuration of the inkjet recording apparatus 600 in this embodiment.
- the main body 1 is provided with a main ink container 31 that holds ink 68A for printing.
- the main ink container 31 has a liquid level sensor 31A (sensor 1), a liquid level sensor 31B (sensor 2) for detecting whether or not the standard liquid level, which is an appropriate amount, has been reached, and when discarding ink from the main ink container 31, detects the end point of the amount of ink discarded.
- a liquid level sensor 31C (sensor 3) is provided.
- the main ink container 31 is connected to a path (for supply) 801 at a portion immersed in the ink 68A, and an electromagnetic valve (for supply) 49 for opening and closing the path is installed in the middle of the path 801.
- the path 801 is connected via a confluence path 901 to the pump (for supply) 34 installed in the path 802 and used to suck and pump the ink 68A.
- the output side of the pump (for supply) 34 is connected to a filter (for supply) 39 for removing foreign matter mixed in the ink 68A.
- the filter (for supply) 39 is connected to a pressure regulating valve 46 that adjusts the pressure of the ink 68A pressure-fed from the pump (for supply) 34 to a proper pressure for printing. It is connected to pressure sensor 38 which measures the pressure of ink 68A.
- a path 802 in which the pressure regulating valve 46 is arranged is connected via a branch path 921 to a path 803 passing through the cable (for the print head) 5. is connected to a switching solenoid valve 26 for controlling whether to supply the
- a heater 20 is installed in front of the electromagnetic valve (for switching) 26 to heat the temperature of the ink 68A supplied to the nozzle 21 to an optimum temperature.
- the heater 20 is internally equipped with a heating control temperature sensor (not shown).
- the solenoid valve (for switching) 26 is connected via a filter 27 to the nozzle 21 that ejects the ink 68A.
- the solenoid valve (for switching) 26 is a three-way solenoid valve, and the path 803 for ink supply and the path 825 for nozzle cleaning are connected to the solenoid valve (for switching) 26 .
- the supply of ink 68A and solvent 69A can be switched.
- the gutter 25 is connected to a path 811, and the path 811 is provided with the charge sensor 48 for detecting whether or not the ink particles 68B charged by the charging electrode 23 are collected.
- the path 811 passes through the cable (for the print head) 5 and is connected to the filter (for recovery) 40 that removes foreign matter mixed in the ink arranged in the main body 1.
- the (for recovery) 40 is connected to an electromagnetic valve (for recovery) 50 that opens and closes the path.
- the solenoid valve (for recovery) 50 is arranged in the path 812 connected via the confluence path 902 and connected to the pump (for recovery) 35 that sucks the ink particles 68B captured by the gutter 25 .
- a pump (for recovery) 35 is connected to the main ink container 31 .
- the main ink container 31 is connected to a path 814 in an upper space that does not contact the ink 68A, and the path 814 is connected to the exhaust duct connection portion 62 that communicates with the outside of the main body 1. .
- the nozzles 21 provided in the print head 2 are connected to a path 821 passing through the cable (for print head) 5 in addition to the path through which the ink 68A is supplied via the filter 27 .
- An electromagnetic valve (for circulation) 59 that is provided in the main body 1 and that opens and closes the path (flow path) is arranged in the path 821 .
- the electromagnetic valve (for circulation) 59 is connected to a path 822 via a confluence path 903 , and a pump (for circulation) 36 for sucking ink from the nozzles 21 is arranged in the path 822 .
- the pump (for circulation) 36 is connected to the main ink container 31 via a path 822 .
- the viscosity measurement paths (824 and 822) of the inkjet recording apparatus 600 in this embodiment will be described.
- the main 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 filter (for viscosity measurement) 42 for removing foreign matter mixed in the ink 68A supplied from the main ink container 31. It is connected to a viscosity measuring device (viscometer) 45 in order to grasp the viscosity of the ink 68A.
- a viscosity measuring device viscometer
- a viscosity measuring device (viscometer) 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 the pump (for circulation) 36 arranged in the path 822 via the confluence path 903 .
- the ink 68A in the main ink container 31 can be circulated through the viscosity measurement path, and the viscosity of the ink 68A can be measured by the viscosity measuring device (viscometer) 45. Information about the viscosity thus measured is input to the control section 7 and used for viscosity control of the ink 68A in the main ink container 31.
- the main body 1 is provided with a solvent container 33 holding a solvent 69A for replenishing the solvent to the main ink container 31, nozzle cleaning, or head cleaning.
- the solvent container 33 is equipped with a solvent cartridge 69B containing a replenishment solvent.
- the solvent container 33 is connected to a path 831 at a portion immersed in the solvent 69A, and the path 831 is provided with a pump (for solvent) 37 used for sucking and pumping the solvent.
- a 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 the solenoid valve (for solvent supply) 53 in order to open and close the path arranged in the path 833 in the solvent supply path. is connected to the main ink container 31 at the bottom.
- the paths 831 to 833 are used to control the viscosity of the ink 68A in the main ink container 31 under the control of the controller 7 .
- the solvent container 33 and the exhaust duct connection portion 62 are connected to discharge the evaporated solvent to the outside. are connected by an exhaust path 816 .
- the main body 1 is provided with an auxiliary ink container 32 that holds replenishment ink 68C.
- the auxiliary ink container 32 is equipped with an ink cartridge 68D containing supplementary ink.
- the auxiliary ink container 32 is connected to the path 806 at the portion immersed in the ink 68C.
- the path 806 is connected to an electromagnetic valve (for ink replenishment) 54 for opening and closing the path.
- an electromagnetic valve (for ink replenishment) 54 for opening and closing the path.
- a pump (supply) 34 used for pumping.
- the ink 68C in the auxiliary ink container 32 is ejected from the nozzle 21 through the paths 802 and 803 with the solenoid valve (for ink supply) 54 opened and the solenoid valve (for supply) 49 closed.
- 25, path 811, electromagnetic valve 50, and pump 35 the main ink container 31 is replenished.
- the auxiliary ink container 32 and the exhaust gas are arranged to discharge the evaporated solvent to the outside. It is connected to the duct connection portion 62 by an exhaust path 815 .
- the pump (for solvent) 37 arranged in path 831 is connected to path 825 via branch path 922 .
- the path 825 is connected to an electromagnetic valve (for nozzle cleaning) 55 for opening and closing the path.
- the electromagnetic valve (for nozzle cleaning) 55 is connected to a filter (for nozzle cleaning) 41 for removing foreign substances mixed in the solvent 69A.
- a filter (for nozzle cleaning) 41 is provided in the print head 2 via a path 821 passing through the cable (for print head) 5, and is used to control whether or not solvent 69A is sent to the nozzles 21 for cleaning. It is configured to be connected to a solenoid valve (for switching) 26 .
- Path 802 is connected to path 808 via branch path 921 .
- the path 808 is connected to a solenoid valve (for body circulation) 58 that opens and closes the path. ) 35.
- the pump (for solvent) 37 is connected to a 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 path.
- the solenoid valve (for head cleaning) 56 is connected to a filter (for head cleaning) 43 that removes foreign matter mixed in the solvent 69A.
- the collection container 4 attached to the head mounting unit 3 is provided to store the solvent after washing with the cleaning liquid (solvent) ejected from the cleaning nozzle 72 installed in the cleaning tank 71 of the head mounting unit 3.
- a float 74 containing a magnet is provided in the collection container 4 to detect the liquid level of the solvent after washing.
- Magnetic sensors 76A and 76B and a magnet 75 for detecting the amount of solvent accumulated inside the collection container 4 are attached to the outside of the collection container 4. As shown in FIG. When the float 74 containing the magnet 75 reaches a predetermined liquid level, the magnetic sensor 76A detects the magnetism of the magnet 75 contained in the float 74 and controls that the washing liquid in the collection container 4 reaches the predetermined liquid level.
- the air supply path (path 841) of the inkjet recording apparatus 600 in this embodiment will be described.
- the main body 1 is provided with a pump (for drying) 60 used for sucking and pumping air, and the pump (for drying) 60 has an air suction port communicating with the inside of the main body 1. forming.
- the pump (for drying) 60 is connected to the head-mounted unit 3 via a path 841 passing through the cable (for head-mounted unit) 6 .
- the washing tank 71 provided in the head mounting unit 3 is used for sucking and pumping air provided in the main body 1 through a path 843 passing through the cable (for the head mounting unit) 6. It is connected to a pump (for suction) 61 .
- a pump (for suction) 61 is connected to an exhaust duct connection portion 62 that communicates with the outside of the main body 1 .
- FIG. 3 is a diagram showing a schematic configuration of the control section 7 and the printing mechanism section (main body 1 and print head 2) of the inkjet recording apparatus 600 in this embodiment.
- reference numeral 301 denotes a microprocessing unit (hereinafter referred to as MPU) which is a control section that controls the entire inkjet recording apparatus 600 .
- MPU microprocessing unit
- a bus line 302 has a function of transmitting data, control signals, and the like between devices constituting the control unit.
- the bus line 302 is used to input data necessary for the operation of the MPU 301 and detection signals from each device and to transmit data signals, address signals and control signals to each device.
- Reference numeral 8 denotes an operation display unit for inputting print contents, set values, etc., and displaying input data, print contents, etc.
- FIG. The operation display unit 8 uses a touch input type display panel in which transparent touch switches are superimposed on the surface of a liquid crystal display screen.
- the head mounted unit 3 can be controlled from the operation display section 8 of the control section 7.
- the operation section (the start button 18 and the stop button 19) controls the operation operation of the head mounted unit 3 to the operation display section 8. Instead, it is used when operating near the head-mounted unit 3.
- the display unit 15 is used when confirming the operating state of the head-mounted unit 3, an error message, and the like near the head-mounted unit 3 instead of the operation display unit 8 .
- the print head 2 of the inkjet recording device 600 is provided with nozzles 21 for ejecting the ink 68A that is pressurized and supplied from the main ink container 31 as particles.
- the nozzle 21 ejects ink in a columnar shape, and the tip is separated to eject ink particles 68B.
- the print head 2 also includes charging electrodes 23 surrounding the ink particles 68B, and charges the ink particles 68B according to the content of printing.
- the print head 2 deflects the flying ink particles 68B charged by the charging electrode 23 according to the amount of charge, and causes them to fly toward the object to be printed (not shown). Printing is performed by the flying ink particles landing on the object to be printed.
- 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 includes a gutter 25 that captures ink particles 68B (unused ink) that have not been used for printing, and charging of the ink particles 68B1 that are minutely charged among the ink particles 68B captured by the gutter 25. and a charge sensor 48 for generating a phase detection signal responsive to the amount.
- a pump (for recovery) 35 for recovering the ink (ink particles) captured by the gutter 25 to the main ink container 31, and an ink recovery path 811 connecting the gutter 25 and the main ink container 31. ⁇ 812.
- the control unit 7 controls an excitation voltage generating circuit that excites an electrostrictive element (not shown) built in the nozzle 21 in order to give regularity to the timing at which the ink particles 68B are separated from the ink column ejected from the nozzle 21. 331.
- the control unit 7 also has a charging signal generating circuit 342 for printing and a charging signal generating circuit 341 for phase search, and a D/A for converting the charging signal in the form of a digital signal outputted from them into a voltage signal in the form of an analog form. It has a converter 343 and an amplifier circuit 344 that amplifies the analog voltage signal output from the D/A converter 343 to generate a charging voltage to be applied to the charging electrode 23 .
- the charging signal generating circuit 342 for printing and the charging signal generating circuit 341 for phase search only the charging signal generating circuit 342 for printing may be used to control the amount of charging by the controller. .
- the inkjet recording apparatus 600 also includes a deflection voltage generation circuit 332 that generates deflection voltages to be applied to the deflection electrodes 24 .
- the inkjet recording apparatus 600 also includes an amplifier circuit 353 for amplifying the analog phase detection signal output from the charge sensor 48, a phase determination circuit 351 for inputting the amplified phase detection signal and determining whether charging is good or not, An A/D converter 352 is provided for inputting and A/D converting the amplified phase detection signal.
- the MPU 301 of the control unit 7 controls the liquid level detection circuit 313 for managing the liquid level of the main ink container 31 via the bus line 302, and the pressure of the ink supplied to the nozzles 21.
- a pressure detection circuit 312 for detecting whether the viscosity of the ink 68A supplied to the nozzle 21 is an appropriate value for printing a viscosity measurement circuit 311 for measuring with the viscosity measuring device 45 whether the A pump control circuit 314 for controlling the pumps 34 to 37 arranged in the main body 1 for sucking and pumping, electromagnetic valves 49 to 50 and 53 to 59 of each path for controlling the opening and closing It is connected to the valve drive circuit 315 and controls each section.
- the MPU 301 also receives, via a bus line 302, a pump control circuit 321 for controlling the pumps 60 and 61, a head mounting unit 3 to which the collecting container 4 is mounted, and a predetermined amount of liquid 70 in the collecting container 4.
- control unit 7 can use a computer. Specifically, the control unit 7 includes the MPU 301, memories (306 and 307) for storing programs for the operation of the MPU 301 and data and information necessary for the operation, and the print head 2 and the head mounting unit according to instructions from the MPU 301. 3. It can be composed of a driving unit that operates the components in the main body 1 . A detailed description of the control unit 7 is omitted here.
- FIG. 4 shows the processing flow of the ink sticking prevention operation.
- the MPU 301 of the control unit 7 determines the level of the print head 2 inside the solvent container 33 based on the signals from the level sensors 33A and 33B based on the stored control program.
- the amount of solvent 69A to be used for cleaning is checked to check whether or not the solvent cartridge 69B containing the solvent for supplying the solvent 69A to the solvent container 33 can be replaced (S401).
- the MPU 301 determines that the amount of the solvent 69A inside the solvent container 33 is small and the solvent cartridge 69B can be replaced (Yes in S401), Proceed to S402. On the other hand, when the level sensor 33A detects the solvent 69A inside the solvent container 33, the MPU 301 determines that the amount of the solvent 69A inside the solvent container 33 is sufficient and the solvent cartridge 69B cannot be replaced. After making a determination (No in S401), the process proceeds to the sticking prevention step (S404).
- the process proceeds to S402, in which guidance from the MPU 301 prompting replacement of the solvent cartridge 69B is displayed on the display unit 15 and the operation display unit 8. be labeled.
- the stop button (not shown) displayed on the display section 15 and the operation display section 8 is touched in S403
- the sticking prevention operation is stopped.
- an execution button (not shown) displayed on the display unit 15 and the operation display unit 8 is touched in S403
- the process proceeds to the sticking prevention step (S404).
- the MPU 301 controls the solenoid valve drive circuit 315 to open and close the solenoid valve (for ink supply) 54, the solenoid valve (for switching) 26, and the solenoid valve (for head cleaning) 56. This is repeated (S4041) to prevent the ink adhering to the electromagnetic valves 54, 26 and 56 from sticking and interfering with the opening and closing operations of the electromagnetic valves 54, 26 and 56.
- the pump control circuit 314 is controlled by the MPU 301 to open the solenoid valve (for recovery) 50 while the pump (for recovery) 35 is in operation, as shown in FIG.
- Air is sucked from the gutter 25 through paths (for recovery) 811 and 812 and supplied to the inside of the main ink container 31 .
- the air supplied to the interior of the main ink container 31 is connected to the exhaust duct connection portion 62 through the path (for exhaust) 814 and is exhausted by exhaust means (not shown).
- the air sucked from the gutter 25 is connected to the exhaust duct connection portion 62 through the inside of the main ink container 31, so that the solvent inside the main ink container 31 is volatilized (volatilized).
- the air sucked from the gutter 25 is connected to the exhaust duct connection portion 62 through the interior of the main ink container 31 to volatilize the solvent inside the main ink container 31. drops, the liquid level sensor 31B no longer detects the ink 68A, and the liquid level of the ink 68A reaches the initial level (the liquid level detection of the ink 68A by the liquid level sensor 31B switches from OFF to ON, or vice versa). level) is reached (S4043).
- the pump (for recovery) 35 is operated to suck air from the gutter 25, the sucked air is temporarily stored inside the main ink container 31, and is exhausted from the exhaust duct connection portion 62 through the path (for exhaust) 814. After 10 minutes, the back pressure of the pump (for recovery) 35 increases and the suction amount of the pump (for recovery) 35 decreases.
- the ink 68A inside the main ink container 31 is discharged from the paths 801 to 808 and 812.
- the amount of air sucked from the gutter 25 by the pump (for recovery) 35 is restored.
- the viscosity of the ink 68A inside the main ink container 31 from which the solvent has volatilized is measured (S4044).
- the solenoid valve (for recovery) 50 is closed and the pump (for circulation) 36 is operated with the solenoid valve (for viscosity measurement) 57 opened.
- the ink 68A inside the main ink container 31 passes through the filter (for viscosity measurement) 42 and then passes through the viscosity measuring device 45 via the path (for viscosity measurement) 824 to measure the viscosity.
- the ink whose viscosity has been measured by the viscosity measuring device 45 passes through the electromagnetic valve (for viscosity measurement) 57 and returns to the main ink container 31 through the path (for head circulation) 822 .
- the solenoid valve (for viscosity measurement) 57 is closed to stop the supply of ink to the viscosity measuring device 45 .
- the pump (for circulation) 36 is in operation, the pump (for solvent) 37 and the pump (for recovery) 35 are operated, and the solenoid valve (for nozzle washing) 55 and the solenoid valve (for recovery) 50 , the electromagnetic valve (for circulation) 59 is opened to jet the solvent from the print head 2 (S4045).
- a thick line consisting of a path (for head circulation) 821 and a path (for head circulation) 822 connecting the nozzles 21 of the print head 2 and the main ink container 31.
- the recovery path indicated by the thick line which is composed of a path (for recovery) 811 and a path (for recovery) 812 connecting the gutter 25 of the print head 2 and the main ink container 31, respectively.
- the solvent 69A housed inside the solvent container 33 is sucked up by the pump (for solvent) 37, passes through the solenoid valve (for nozzle cleaning) 55, and passes through the path (for solvent supply) constituting the solvent path. It is supplied to the nozzle 21 through the filter 27 from the electromagnetic valve (for switching) 26 through 831 and the path (for nozzle cleaning) 825 .
- the solvent supplied to the nozzle 21 passes through a path (for head circulation) 821 forming a circulation path partially connected to the nozzle 21, passes through the electromagnetic valve (for circulation) 59, and then passes through a path (for head circulation) 822. are accommodated in the main ink container 31 from the beginning.
- the solvent ejected forward from the nozzle 21 enters the gutter 25, passes through a path (for recovery) 811 constituting the recovery path, passes through the solenoid valve (for recovery) 50, and passes through a path (for recovery) 812. are accommodated in the main ink container 31 from the beginning.
- the solvent 69A contained in the solvent container 33 is supplied to the print head 2 via the solvent path, and is collected in the main ink container 31 via the circulation path and the recovery path.
- the solvent can be passed through the solenoid valve (for recovery) 50 and the solenoid valve (for circulation) 59, and the ink remaining inside the solenoid valves 50 and 59 can be dissolved by the solvent. can be recovered.
- the print head 2 can be simply covered with a beaker or the like to prevent the ink from sticking. Once attached, it can be carried out without preparing anything like the beaker described above.
- the ink 68A inside the main ink container 31 is circulated (S4046).
- the paths for ink circulation include a path (for supply) 801, a path (for body circulation) 808, and a path (for recovery) 812, and a path (for viscosity measurement). ) 824 to a path (for head circulation) 822 .
- the path (for supply) By energizing the solenoid valve (for supply) 49 and the solenoid valve (for body circulation) 58 to open the path and operating the pump (for supply) 34 and the pump (for recovery) 35, the path (for supply)
- the ink 68A contained in the main ink container 31 flows along a path from 801 through a path (for main body circulation) 808 to a path (for recovery) 812 .
- the ink 68A discharged from the main ink container 31 passes through an electromagnetic valve (for supply) 49, a pump (for supply) 34, a filter (for supply) 39, a pressure regulating valve 46, an electromagnetic valve (for main body circulation) 58, a pump ( 35 for recovery and return to the main ink container 31.
- the path (for viscosity measurement) 824 is changed to the path (for head circulation).
- the ink 68A stored in the main ink container 31 along 822 passes through the viscosity measuring device 45, the solenoid valve (for viscosity measurement) 57, and the pump (for circulation) 36, and returns to the main ink container 31.
- the ink 68A is circulated.
- the sticking prevention operation is brought to a resting state (S4047), and the sticking prevention step (S404) ends.
- the series of operations for preventing ink sticking described with reference to FIG. 4 are automatically executed at regular time intervals while the printing operation using the print head 2 is in a paused state.
- the ink can be prevented from sticking in the solenoid valve inside the main body 1 and the inside of the print head 2, and the print head 2 can be operated after a relatively long period of inactivity. You can start printing smoothly.
- the ink collected from the gutter 25 accumulates in the main ink container 31, and the viscosity of the ink 68A inside the main ink container 31 changes.
- the solvent is ejected from the print head 2 and collected in the main ink container 31, or the main ink container 31 is replenished with the ink 68C in the auxiliary ink container 32, whereby the main ink container 31 is
- the viscosity of the ink 68A contained in the ink container 31 may change and deviate from the proper range.
- the solvent volatilizes during that time and the viscosity of the ink 68A inside the main ink container 31 changes. Therefore, the viscosity of the ink 68A contained in the main ink container 31 is measured, and if the viscosity of the ink 68A deviates from the proper range, the viscosity of the ink 68A is adjusted so that it falls within the proper range. There is a need.
- FIG. 8 shows a processing flow for adjusting the viscosity of the ink 68A contained in the main ink container 31. First, guidance (not shown) regarding viscosity adjustment is displayed on the operation display unit 8 (S801).
- FIG. (For supply) 49 and electromagnetic valve (for main body circulation) 58 are opened to open the path (for supply) 801, the path (for main body circulation) 808, and the path (for recovery) 812, and the ink in the main ink container 31 is discharged.
- 68A is circulated.
- the pump (for circulation) 36 and opening the electromagnetic valve (for viscosity measurement) 57 to open the path (for viscosity measurement) 824 and the path (for head circulation) 822 the main ink container 31 is The ink 68A contained inside is passed through the viscosity measuring device 45 to measure the viscosity of the ink 68A (S803).
- the result of the viscosity measurement in S803 is determined (S8031), and if it is determined that the viscosity of the ink 68A is within the proper range (Yes in S8031), the ink viscosity adjustment step is terminated.
- step S810 if it is determined in S8031 that the viscosity of the ink 68A is higher than the appropriate range ("high” in S8031), the process proceeds to step S810. On the other hand, if it is determined that the viscosity of the ink 68A is lower than the appropriate range ("low” in S8031), the process proceeds to step S830.
- step S810 the state of FIG. 9 is switched to the state of FIG. That is, the electromagnetic valve (for viscosity measurement) 57 is closed to stop the operation of the pump (for circulation) 36, thereby stopping the passage of the ink 68A through the viscosity measuring device 45.
- FIG. Also, the electromagnetic valve 58 is closed to stop the circulation of the ink 68A in the main ink container 31.
- FIG. while the pump (for supply) 34 and the pump (for recovery) 35 are in operation, the solenoid valve (for switching) 26 is opened to open the paths (for supply) 801, 802, 803, and the ink from the main ink container 31 is discharged.
- Ink 68A is supplied to the print head 2 to start ejecting ink from the nozzles 21 (S810).
- the ink 68A supplied to the print head 2 and ejected from the nozzles 21 is collected by the gutter 25 and collected in the main ink container 31.
- the solenoid valve 50 is closed (S811) to block the ink recovery path formed by the path 811 (for recovery) and the path 812 (for recovery).
- the ink 68A supplied to the print head 2 and ejected from the nozzles 21 overflows the gutter 25 and is collected in the collection container 4 attached to the head mounting unit 3.
- FIG. 8 As a result, the liquid level of the ink 68A contained inside the main ink container 31 continues to drop.
- the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) attached to the main ink container 31 is turned OFF (non detection) (Yes in S812).
- This state is maintained until a predetermined time elapses after the detection signal of the liquid level sensor 31B (sensor 2) becomes OFF (non-detection).
- the liquid level of the ink 68A contained inside the main ink container 31 becomes lower than the liquid level detected by the liquid level sensor 31B (sensor 2).
- the predetermined time after the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) is turned OFF (non-detection) (Yes in S812) is the viscosity of the ink measured in S803. It is determined using a conditional expression preset in the MPU 301 according to the temperature of the ink measured by the temperature sensor not provided. If the detected viscosity of the ink greatly deviates from the proper range, the predetermined time is set long, and if the detected viscosity of the ink deviates relatively little from the proper range, the predetermined time is set. is set short.
- the amount of the ink 68A discarded from the main ink container 31 can be reduced. Since it is not necessary to discard all the ink and replace it with new ink, the amount of ink to be discarded can be reduced and the ink can be used effectively.
- the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) attached to the main ink container 31 is OFF (not detected) even after a certain period of time has passed with the ink overflowing from the gutter 25. If not (if the state of No in S812 continues and the preset time has elapsed: Yes in S8121), an abnormal message is output to the operation display unit 8 (S8122), the solenoid valve 49 is closed, and printing is performed. The supply of ink to the head 2 is stopped.
- the electromagnetic valve 50 is opened as shown in FIG.
- the ink recovery path composed of the path (for recovery) 811 and the path (for recovery) 812 (S813), the ink ejected from the nozzles 21 of the print head 2 and collected by the gutter 25 is discharged. It collects in the main ink container 31 .
- the electromagnetic valve (for solvent replenishment) 53 is opened, and a path (for solvent supply) 831 and a path (for solvent replenishment) 833 leading from the solvent container 33 to the main ink container 31 are opened. is opened, the pump (for solvent) 37 is operated.
- the solvent 69A stored in the solvent container 33 is replenished into the main ink container 31 through the paths 831 and 833 (S814).
- the liquid level sensor 31B detects that the liquid level of the ink 68A contained in the main ink container 31 has reached the initial level. Continue until (until Yes in S815).
- the electromagnetic valve (for solvent supply) 53 is turned on. It is closed to stop the supply of the solvent 69A from the solvent container 33 to the main ink container 31, operate the pump (for circulation) 36 as shown in FIG.
- the path (for viscosity measurement) 824 and the path (for head circulation) 822 the ink 68A stored inside the main ink container 31 is passed through the viscosity measuring device 45 to measure the viscosity of the ink 68A ( S816).
- step S803 and step S4044 in the processing flow diagram of FIG. and paths (for recovery) 811 and 812 to recover the main ink container 31, thereby circulating the ink 68A.
- the liquid level of the ink 68A contained in the main ink container 31 is detected by the liquid level sensor 31B (sensor 2) even after a certain period of time has elapsed since the supply of the solvent 69A to the inside of the main ink container 31 was started.
- level has reached the initial level (when the state of No in S815 has timed out at the preset time: Yes in S8151), an abnormal message is output to the operation display unit 8 (S8122).
- the electromagnetic valve (for solvent replenishment) 53 is closed to stop the replenishment of the solvent 69A into the main ink container 31 .
- the viscosity value measured in S816 is judged (S817), and if the measured viscosity value is higher than the setting value stored in advance in the ROM 306 for judging that "the ink viscosity is high" (S817 If No), the process returns to S811 to repeat the steps for lowering the viscosity of the ink.
- the solenoid valve (for supply) 49 in FIG. 21 is stopped (S818), the electromagnetic valve (for viscosity measurement) 57 is closed, and the supply of ink to the viscosity measuring device 45 is stopped.
- the flow from the path (for solvent supply) 831 through the path (for nozzle cleaning) 825 is performed.
- the solvent 69A is supplied from the solvent container 33 to the nozzles 21 of the print head 2 through the solvent path leading to the print head 2.
- the solenoid valve (for recovery) 50 and the solenoid valve (for circulation) 59 are opened to connect the path (for head circulation) 821 and the path (for recovery) 811 from the print head 2 to the main ink container 31.
- the solvent 69A supplied to the print head 2 is recovered in the main ink container 31 through the path (for head circulation) 821 and the path (for recovery) 811.
- FIG. As a result, the ink 68A remaining in the path (for head circulation) 821, the path (for recovery) 811, the nozzles 21, and the gutter 25 is washed away, and the circulation path is cleaned (S819).
- the solenoid valve (for recovery) 50, the solenoid valve (for nozzle cleaning) 55, and the solenoid valve (for circulation) 59 are closed, and the pump (for recovery) 35 and the pump ( 15, the electromagnetic valve (for head cleaning) 56 is opened while the pump (for solvent) 37 is in operation.
- the solvent is sprayed from the outside of the print head 2 by jetting the solvent from the nozzle.
- the print head 2 is subjected to careful head cleaning (S820) that takes longer than normal cleaning and increases the amount of solvent 69A used.
- the dirt on the print head 2 that overflowed the gutter 25 in S811 can be removed.
- the pump (for drying) 60 is operated to blow air from the supply nozzle 73 having an air outlet to the print head 2, and the pump (for suction) 61 is operated to operate the head mounting unit 3. By exhausting the air inside, the print head 2 wet with the solvent 69A is dried, and the thorough head cleaning process is finished.
- the resting state (S821) is entered, and the ink viscosity normalization process is completed. (the value measured in S803) and the value after viscosity adjustment (the value measured in S816) are displayed.
- the information to be displayed in the ink viscosity display area 80 is not the value of the ink viscosity itself, but information about the ink viscosity (for example, “viscosity is high. Adjustment required", “viscosity is within an appropriate range”, etc.). can be In addition, although not shown in FIG.
- step S830 the state of FIG. 9 is switched to the state of FIG. That is, the electromagnetic valve (for viscosity measurement) 57 is closed to stop the operation of the pump (for circulation) 36, thereby stopping the passage of the ink 68A through the viscosity measuring device 45.
- the electromagnetic valve 58 is closed to stop the circulation of the ink 68A in the main ink container 31.
- the solenoid valve (for switching) 26 is opened to open the paths (for supply) 801, 802, 803, and the ink from the main ink container 31 is discharged.
- Ink 68A is supplied to the print head 2 to start ejecting ink from the nozzles 21, and at the same time, the electromagnetic valve (for recovery) 50 is opened to eject the ink composed of the path (for recovery) 811 and the path (for recovery) 812.
- the ink 68A supplied to the print head 2 and ejected from the nozzles 21 is collected by the gutter 25 and collected in the main ink container 31 by opening the collection path.
- the amount of the ink 68A collected by the gutter 25 and collected in the main ink container 31 through the ink collection path with respect to the amount of the ink 68A supplied from the main ink container 31 to the print head 2 decreases by the volatilization of the solvent.
- the liquid level of the ink 68A contained inside the ink container 31 continues to drop.
- the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) attached to the main ink container 31 becomes OFF (non-detection).
- This state is maintained until a predetermined time elapses after the detection signal of the liquid level sensor 31B (sensor 2) becomes OFF (non-detection).
- the liquid level of the ink 68A contained inside the main ink container 31 becomes lower than the liquid level detected by the liquid level sensor 31B (sensor 2).
- the predetermined time after the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) turns OFF (non-detection) (Yes in S832) is illustrated as the ink viscosity measured in S803. It is determined using a conditional expression preset in the MPU 301 according to the temperature of the ink measured by the temperature sensor not provided. If the detected viscosity of the ink greatly deviates from the proper range, the predetermined time is set long, and if the detected viscosity of the ink deviates relatively little from the proper range, the predetermined time is set. is set short.
- the entire ink 68A in the main ink container 31 is discarded even if the viscosity of the ink is lower than the appropriate range. Therefore, it is possible to reduce the amount of ink to be discarded and use the ink effectively.
- the ink 68A is supplied from the main ink container 31 to the print head 2, ejected from the nozzles 21, collected by the gutter 25, and collected in the main ink container 31 through the ink collection path even after a certain period of time. If the detection signal of the ink 68A by the liquid level sensor 31B (sensor 2) attached to the main ink container 31 does not turn OFF (non-detection) (the state of No in S832 continues and the preset time expires) If so: Yes in S8321), an error message is output to the operation display unit 8 (S8322), the electromagnetic valve 49 is closed, and the supply of ink to the print head 2 is stopped.
- the ink 68C ejected from the nozzle 21 is collected by the gutter 25 and recovered in the main ink container 31 through the ink recovery path. As a result, the main ink container 31 is replenished with the ink 68C contained in the auxiliary ink container 32 (S833).
- the ink 68C is supplied from the auxiliary ink container 32 to the main ink container 31 when the level of the ink 68A contained in the main ink container 31 reaches the initial level by the liquid level sensor 31B (sensor 2). is detected (until Yes in S834).
- the pump (circulation ) 36 is operated to open the solenoid valve (for viscosity measurement) 57 to open the path (for viscosity measurement) 824 and the path (for head circulation) 822 .
- the ink 68A is passed through the viscosity measuring device 45 to measure the viscosity of the ink 68A (S835).
- step S803 and step S4044 in the processing flow diagram of FIG. and paths (for recovery) 811 and 812 to recover the main ink container 31, thereby supplying the ink 68C from the auxiliary ink container 32 to the main ink container 31.
- FIG. 811 and 812 to recover the main ink container 31, thereby supplying the ink 68C from the auxiliary ink container 32 to the main ink container 31.
- the liquid level of the ink 68A contained in the main ink container 31 is detected by the liquid level sensor 31B (sensor 2) even after a certain period of time has elapsed since the supply of the ink 68C to the inside of the main ink container 31 was started.
- level has reached the initial level (when the state of No in S834 has timed out at the preset time: Yes in S8341), an abnormal message is output to the operation display unit 8 (S8322).
- the electromagnetic valve (for ink replenishment) 54 is closed to stop replenishment of the ink 68C from the auxiliary ink container 32 to the main ink container 31 .
- the viscosity value measured in S835 is judged (S836), and if the measured viscosity value is lower than the setting value stored in advance in the ROM 306 for judging that "the ink viscosity is low" (S836 If No), the process returns to S831 and repeats the process for increasing the viscosity of the ink.
- the flow from the path (for solvent supply) 831 through the path (for nozzle cleaning) 825 is performed.
- the solvent 69A is supplied from the solvent container 33 to the nozzles 21 of the print head 2 through the solvent path leading to the print head 2.
- the solenoid valve (for recovery) 50 and the solenoid valve (for circulation) 59 are opened to connect the path (for head circulation) 821 and the path (for recovery) 811 from the print head 2 to the main ink container 31.
- the solvent 69A supplied to the print head 2 is recovered in the main ink container 31 through the path (for head circulation) 821 and the path (for recovery) 811.
- FIG. As a result, the ink 68A remaining in the path (for head circulation) 821, the path (for recovery) 811, the nozzles 21, and the gutter 25 is washed away, and the circulation path is cleaned (S838).
- the resting state (S839) is entered and the ink viscosity normalization process is completed.
- the value (value measured in S803) and the value after viscosity adjustment (value measured in S835) are displayed.
- the information to be displayed in the ink viscosity display area 80 is not the value of the ink viscosity itself, but the information about the ink viscosity (for example, "viscosity is low. Adjustment required", “viscosity is within proper range”, etc.). can be In addition, although not shown in FIG. 17, information on the date and time when the viscosity was adjusted and further information on the date and time when the viscosity was last adjusted are also displayed in the ink viscosity display area 80 of the operation display unit 8. You may do so.
- the viscosity of the ink is measured, and if the viscosity is out of the predetermined range, the viscosity is automatically adjusted depending on whether the viscosity is high or low. In some cases, it is possible to supply the ink to the head while maintaining the viscosity of the ink in an appropriate range.
- the viscosity of the ink when the viscosity of the ink exceeds the predetermined range, the viscosity of the ink can be adjusted to an appropriate range simply by discarding part of the ink contained in the main ink container. Since it is no longer necessary to discard all the ink in the main ink container and replace it with new ink, the amount of discarded ink can be reduced and the effective use of ink can be increased.
- Auxiliary ink container 33... Solvent container, 34... Pump (for supply), 35... Pump (for recovery), 36... Pump (for circulation), 37... Pump (For solvent), 38... Pressure sensor, 39... Filter (for supply), 40... Filter (for recovery), 41... Filter (for nozzle cleaning), 43... Filter (for head cleaning), 45... Viscosity measuring instrument, 46... Pressure regulating valve 48... Electric charge sensor 49... Solenoid valve (for supply) 50... Solenoid valve (for recovery) 53... Solenoid valve (for solvent supply) 54... Solenoid valve (for ink supply) 55... Solenoid valve (for nozzle washing) 56 ... Solenoid valve (for head washing) 57 ...
- Solenoid valve for viscosity measurement
- Solenoid valve for body circulation
- Solenoid valve for circulation
- 60 Pump (for drying)
- pump for suction
- 62 exhaust duct connection part 68A ink 68B ink particles 68B1 ink particles 68C ink 69A solvent
- 70 liquid 74 float 75
- Magnet 76A B
- Magnetic sensor 81A
- Head mounting part 91
- Fixing part 92 ...
- Fixing jig for conveyor
- Path for viscosity measurement
- 825... Path for nozzle cleaning
- 831... Path for solvent supply
- 833... Path for solvent supply
- 837... Path for head cleaning
- 841... Path for air supply
- 843... path for air suction
- 901 to 903... confluence path 921... branch path.
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Abstract
Description
最初に、本発明の実施例1におけるインクジェット記録装置の使用状態について、図1を用いて説明する。図1は、本発明の実施例1におけるインクジェット記録装置の使用状況を示す斜視図である。
なお、ヘッド装着ユニット3の下部に取付けられている回収容器4は、ヘッド装着ユニット3による印字ヘッド洗浄後の液体(洗浄液)を収容するために設けられている。
次に、実施例1におけるインクジェット記録装置600(図1に示したインクジェット記録装置600Aとインクジェット記録装置600Bとを総称して、インクジェット記録装置600と記す)の経路構成について、図2を用いて説明する。図2は、本実施例におけるインクジェット記録装置600の全体の経路構成を示す図である。
次に、本実施例におけるインクジェット記録装置600の制御部7の構成について説明する。図3は、本実施例におけるインクジェット記録装置600の制御部7および印字機構部(本体1および印字ヘッド2)の概略構成を示す図である。図3において、301は、インクジェット記録装置600全体を制御する制御部であるマイクロプロセッシングユニット(以下、MPUという)である。
印字ヘッド2による印字の休止中に印字ヘッド2をヘッド装着ユニット3に装着した状態で行う、インクの固着を防止する動作について、図4乃至7を用いて説明する。
次に、印字ヘッド2をヘッド装着ユニット3に装着した状態で行う、主インク容器内のインクの粘度調整について図8乃至図16を用いて説明する。
図8のS8031において主インク容器31に収容されたインク68Aの粘度が適正な範囲よりも高いと判定した場合には、S810以降のステップを実行して、高いインク粘度が適正な値の範囲に入るようにインク粘度の調整を行う。
また、電磁弁58を閉じて主インク容器31内のインク68Aの循環を停止する。次に、ポンプ(供給用)34とポンプ(回収用)35を作動させた状態で電磁弁(切替用)26を開いて経路(供給用)801,802,803を開いて主インク容器31から印字ヘッド2にインク68Aを供給してノズル21からインク噴出を開始する(S810)とともに、電磁弁(回収用)50を開いて、経路(回収用)811と経路(回収用)812とで構成されるインク回収経路を開通させて印字ヘッド2に供給されてノズル21から噴出したインク68Aをガター25で捕集して主インク容器31に回収する。
図8のS8031において、主インク容器31に収容されたインク68Aの粘度が適正な範囲よりも低いと判定した場合には、S830以降のステップを実行して、低いインク粘度が適正な値の範囲に入るようにインク粘度の調整を行う。
また、電磁弁58を閉じて主インク容器31内のインク68Aの循環を停止する。
本実施例によれば、インクジェット記録装置の休止状態が継続する場合、休止の開始から一定期間ごとに印字ヘッドから溶剤を噴出してガターからその溶剤を回収すること、および装置本体の内部でインクを循環させるようにしたので、インクジェット記録装置の休止状態が長時間継続するような場合であっても、電磁弁などにインクが固着してしまうのを防止することができる。
Claims (16)
- インクを吐出するノズルを備えて印字対象物に印字する印字ヘッドと、
前記印字ヘッドに供給するインクが収容されるインク容器と、前記インク容器に前記インクを供給する補助インク容器と、溶剤が収容される溶剤容器と、前記インク容器から前記印字ヘッドに前記インクを供給する供給用ポンプを備えた供給経路と、前記印字ヘッドに供給された前記インクの一部を前記インク容器に戻す循環用ポンプを備えた循環経路と、前記印字ヘッドの前記ノズルから噴出された前記インクを吸引して前記インク容器に回収する回収用ポンプを備えた回収経路と、前記インク容器に収容された前記インクの粘度を測定する粘度測定部とを備えた本体と、
前記印字ヘッドを装着するヘッド装着ユニットと、
前記印字ヘッドと前記本体とを制御する制御部と
を備えたインクジェット記録装置であって、
前記制御部は、前記粘度測定部で測定した前記インクの粘度が予め設定した所定の範囲を外れた場合には前記インクの粘度が前記所定の範囲に収まるように前記印字ヘッドと前記本体を制御することを特徴とするインクジェット記録装置。 - 請求項1記載のインクジェット記録装置であって、
前記制御部は、前記粘度測定部で測定した前記インクの粘度が予め設定した前記所定の範囲よりも高い場合には、前記印字ヘッドと前記本体を制御して、前記印字ヘッドを前記ヘッド装着ユニットに装着した状態で、前記インク容器に収容されている前記インクの一部を前記供給経路を介して前記印字ヘッドから前記ヘッド装着ユニットの内部に廃棄し、前記溶剤容器に収容された前記溶剤を前記インク容器に供給することにより前記インク容器に内部に収容されている前記インクの粘度を低減させることを特徴とするインクジェット記録装置。 - 請求項2記載のインクジェット記録装置であって、
前記制御部は、前記粘度測定部で測定した前記インクの粘度が予め設定した前記所定の範囲よりも高くて前記インク容器に収容されている前記インクを前記印字ヘッドから廃棄する場合に、前記インクを前記印字ヘッドから廃棄することにより前記インク容器に収容されている前記インクの液面が前記インク容器に予め設定した前記インクの基準面よりも低くなる量を、前記粘度測定部で測定した前記インクの粘度に応じて変えることを特徴とするインクジェット記録装置。 - 請求項3記載のインクジェット記録装置であって、
前記インクを前記印字ヘッドから廃棄した後に、前記印字ヘッドを前記溶剤容器に収容された前記溶剤で洗浄することを特徴とするインクジェット記録装置。 - 請求項1記載のインクジェット記録装置であって、
前記制御部は、前記粘度測定部で測定した前記インクの粘度が予め設定した前記所定の範囲よりも低い場合には、前記印字ヘッドと前記本体を制御して、前記補助インク容器から前記印字ヘッドを介して前記インク容器に前記インクを供給する事により前記インク容器に内部に収容されている前記インクの粘度を増加させることを特徴とするインクジェット記録装置。 - 請求項1記載のインクジェット記録装置であって、
前記本体は操作表示部を更に備え、前記制御部で前記本体を制御して前記インクの粘度が前記所定の範囲に収まった後に、前記インクの粘度に関する情報を前記操作表示部に表示することを特徴とするインクジェット記録装置。 - 請求項6記載のインクジェット記録装置であって、
前記操作表示部に表示する前記インクの粘度に関する情報として、前記制御部で前記本体を制御して前記インクの粘度を調整する前の前記インクの粘度が予め設定した前記所定の範囲を外れた状態の前記インクの粘度に関する情報と、前記制御部で前記本体を制御して前記インクの粘度が前記所定の範囲に収まった後の前記インクの粘度に関する情報を含むことを特徴とするインクジェット記録装置。 - 請求項1記載のインクジェット記録装置であって、
前記制御部は、前記粘度測定部で測定した前記インクの粘度が予め設定した前記所定の範囲を外れた場合には前記インクの粘度が前記所定の範囲に収まるように前記印字ヘッドと前記本体を制御することを前記印字ヘッドから前記インクを吐出させながら状態で行い、前記インクの粘度が前記所定の範囲に収まった後に前記印字ヘッドからの前記インクの吐出を停止させ、前記溶剤容器から前記溶剤を供給して前記循環経路を洗浄することを特徴とするインクジェット記録装置。 - インクを吐出するノズルを備えて印字対象物に印字する印字ヘッドと、
前記印字ヘッドに供給するインクが収容されるインク容器と、溶剤が収容される溶剤容器と、前記インク容器から前記印字ヘッドにインクを供給する供給経路と、前記印字ヘッドに供給された前記インクの一部を前記インク容器に戻す循環経路と、前記印字ヘッドの前記ノズルから噴出された前記インクを吸引して前記インク容器に回収する回収経路とを備えた本体と、
前記印字ヘッドと前記本体とを制御する制御部と
を備えたインクジェット記録装置であって、
前記制御部は、前記印字ヘッドによる前記印字対象物への印字を休止中に前記印字ヘッドと前記本体を制御して、前記溶剤容器に収容した前記溶剤を前記印字ヘッドに供給して前記循環経路と前記回収経路を通して前記インク容器に戻すことを、前記印字ヘッドによる前記印字の休止中の一定時間ごとに繰り返して行うことを特徴とするインクジェット記録装置。 - 請求項9記載のインクジェット記録装置であって、
前記回収経路は回収用電磁弁と回収用ポンプを備え、前記制御部は、前記印字ヘッドが前記印字対象物への前記印字の休止中において前記一定時間ごとに、前記回収用電磁弁に通電して前記回収用電磁弁を開いた状態で前記回収用ポンプを作動させることにより、前記印字ヘッドの側から前記回収経路を通して前記インク容器に空気を流入させて前記インク容器に収容されている前記インクに含まれる溶剤を揮散させることを特徴とするインクジェット記録装置。 - インクを吐出するノズルを備えて印字対象物に印字する印字ヘッドと、前記印字ヘッドに供給するインクが収容されるインク容器と、前記インク容器に前記インクを供給する補助インク容器と、溶剤が収容される溶剤容器と、前記インク容器から前記印字ヘッドに前記インクを供給する供給経路と、前記印字ヘッドに供給された前記インクの一部を前記インク容器に戻す循環経路と、前記印字ヘッドの前記ノズルから噴出された前記インクを吸引して前記インク容器に回収する回収経路と、前記インク容器に収容された前記インクの粘度を測定する粘度測定部とを備えた本体と、前記印字ヘッドを装着するヘッド装着ユニットと、前記印字ヘッドと前記本体とを制御する制御部とを備えたインクジェット記録装置において前記インク容器に収容された前記インクの粘度を管理する方法であって、
前記粘度測定部で測定した前記インクの粘度が予め設定した所定の範囲よりを外れた場合には、前記制御部で前記印字ヘッドと前記本体を制御して前記インク容器に収容された前記インクの粘度を調整することを特徴とするインクジェット記録装置の管理方法。 - 請求項11記載のインクジェット記録装置の管理方法であって、
前記粘度測定部で測定した前記インクの粘度が予め設定した所定の範囲よりも高い場合に、前記制御部は、前記印字ヘッドと前記本体を制御して、前記印字ヘッドを前記ヘッド装着ユニットに装着した状態で、前記インク容器に収容されている前記インクの一部を前記供給経路を介して前記印字ヘッドから前記ヘッド装着ユニットの内部に廃棄し、前記溶剤容器に収容された前記溶剤を前記インク容器に供給することにより前記インク容器に内部に収容されている前記インクの粘度を低減させることを特徴とするインクジェット記録装置の管理方法。 - 請求項12記載のインクジェット記録装置の管理方法であって、
前記粘度測定部で測定した前記インクの粘度が予め設定した所定の範囲よりも高くて前記インク容器に収容されている前記インクを前記印字ヘッドから廃棄する場合に、前記インクを前記印字ヘッドから廃棄することにより前記インク容器に収容されている前記インクの液面が前記インク容器に予め設定した前記インクの基準面よりも低くなる量を、前記粘度測定部で測定した前記インクの粘度に応じて変えることを特徴とするインクジェット記録装置の管理方法。 - 請求項11記載のインクジェット記録装置の管理方法であって、
前記粘度測定部で測定した前記インクの粘度が予め設定した所定の範囲よりも低い場合に、前記制御部は、前記印字ヘッドと前記本体を制御して、前記補助インク容器から前記印字ヘッドを介して前記インク容器に前記インクを供給する事により前記インク容器の内部に収容されている前記インクの粘度を増加させることを特徴とするインクジェット記録装置の管理方法。 - インクを吐出するノズルを備えて印字対象物に印字する印字ヘッドと、前記印字ヘッドに供給するインクが収容されるインク容器と、溶剤が収容される溶剤容器と、前記インク容器から前記印字ヘッドに前記インクを供給する供給経路と、前記印字ヘッドに供給された前記インクの一部を前記インク容器に戻す循環経路と、前記印字ヘッドの前記ノズルから噴出された前記インクを吸引して前記インク容器に回収する回収経路とを備えた本体と、前記印字ヘッドと前記本体とを制御する制御部とを備えたインクジェット記録装置において前記印字ヘッドによる印字を休止中にインク固着を防止する方法であって、
前記印字ヘッドによる前記印字の休止中の一定時間ごとに、前記制御部で前記印字ヘッドと前記本体を制御して、前記溶剤容器に収容した前記溶剤を前記印字ヘッドに供給して前記循環経路と前記回収経路を通して前記インク容器に戻すことを前記印字ヘッドによる前記印字の休止中の一定時間ごとに繰り返して行うことにより前記インクの固着を防止することを特徴とするインクジェット記録装置の管理方法。 - 請求項15記載のインクジェット記録装置の管理方法であって、前記制御部で制御して、前記印字ヘッドが前記印字対象物への前記印字の休止中において前記一定時間ごとに前記回収経路に備えた回収用電磁弁に通電して前記回収用電磁弁を開いた状態で前記回収経路に備えたポンプを作動させることにより、前記印字ヘッドの側から前記回収経路を通して前記インク容器に空気を流入させて前記インク容器に収容されている前記インクに含まれる溶剤を揮散させることを特徴とするインクジェット記録装置の管理方法。
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JP2007062071A (ja) | 2005-08-30 | 2007-03-15 | Hitachi Industrial Equipment Systems Co Ltd | インクジェット記録装置 |
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JP2019123117A (ja) | 2018-01-15 | 2019-07-25 | 株式会社日立産機システム | インクジェット記録装置 |
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