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WO2018159097A1 - Dispositif d'enregistrement à jet d'encre et procédé de commande de dispositif d'enregistrement à jet d'encre - Google Patents

Dispositif d'enregistrement à jet d'encre et procédé de commande de dispositif d'enregistrement à jet d'encre Download PDF

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Publication number
WO2018159097A1
WO2018159097A1 PCT/JP2018/000076 JP2018000076W WO2018159097A1 WO 2018159097 A1 WO2018159097 A1 WO 2018159097A1 JP 2018000076 W JP2018000076 W JP 2018000076W WO 2018159097 A1 WO2018159097 A1 WO 2018159097A1
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WO
WIPO (PCT)
Prior art keywords
control unit
unit
paper
image
recording apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/000076
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English (en)
Japanese (ja)
Inventor
裕貴 富田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP2019502479A priority Critical patent/JP7017160B2/ja
Publication of WO2018159097A1 publication Critical patent/WO2018159097A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an ink jet recording apparatus that detects defective nozzles of an ink jet head and a method for controlling the ink jet recording apparatus.
  • the ink jet recording apparatus forms (records) an image on a recording medium such as paper by ejecting ink droplets from nozzles provided in the ink jet head.
  • a recording medium such as paper
  • the ink jet recording apparatus there is a possibility that defective ejection of the nozzle may occur due to air mixing into the nozzle of the ink jet head or adhesion of foreign matters such as paper dust near the nozzle.
  • Patent Document 1 In order to detect such a discharge failure of a nozzle, for example, a technique as disclosed in Patent Document 1 is disclosed.
  • a test pattern is formed on a part of a sheet, and this test pattern is read by a scanner unit to detect nozzle ejection defects.
  • Patent Document 1 has a problem that when there is no margin for printing a test chart on a sheet, it is impossible to detect a defect of the inkjet head. Furthermore, in the technique described in Patent Document 1, since the region where the test pattern is formed is narrow, it is possible to detect ejection failure of the entire inkjet head, but ejection failure occurs in any nozzle in the inkjet head. It was difficult to accurately detect whether or not.
  • the present invention provides an inkjet head recording apparatus and an inkjet recording apparatus control method capable of accurately detecting which nozzle has an ejection failure in the inkjet head.
  • the purpose is to provide.
  • the ink jet recording apparatus of the present invention includes an ink jet head, an image reading unit, and a control unit.
  • the ink jet head has a plurality of nozzles that eject ink onto a recording medium, and forms an image on the recording medium.
  • the image reading unit has a resolution that is coarser than the resolution of the inkjet head, and reads an image formed on the recording medium by the inkjet head.
  • the control unit controls the inkjet head and the image reading unit.
  • the control unit controls the ink jet head to form a test chart for detecting ejection failure of a plurality of nozzles on a single recording medium after performing a prescribed number of normal image formations.
  • the method for controlling the ink jet recording apparatus of the present invention includes the following steps (1) to (2).
  • (1) A step in which the control unit controls the ink jet head to form an image by ejecting ink from a plurality of nozzles toward a recording medium.
  • (2) A step in which the control unit controls the ink jet head after normal image formation is performed to form a test chart for detecting ejection failure of a plurality of nozzles on one recording medium.
  • the inkjet head recording apparatus and the inkjet recording apparatus control method configured as described above, it is possible to accurately detect which nozzle has an ejection failure in the inkjet head.
  • FIG. 1 is an overall configuration diagram illustrating an ink jet recording apparatus according to an embodiment of the present invention.
  • FIG. 3 is a plan view showing a state in which the head unit in the ink jet recording apparatus according to the embodiment of the present invention is viewed from the recording medium side.
  • FIG. 2 is a block diagram illustrating a configuration of a control system of the ink jet recording apparatus according to the exemplary embodiment of the present invention. It is explanatory drawing which shows the example of a display displayed on the operation display part in the inkjet recording device which concerns on the example of embodiment of this invention.
  • FIG. 5A shows an example of a test chart in an ink jet recording apparatus according to an embodiment of the present invention
  • FIG. 5A is an explanatory diagram showing the entire test chart
  • FIG. 5B is an explanatory diagram showing an enlarged part of the test chart.
  • FIG. 5 is an explanatory diagram illustrating a first operation example of a discharge failure detection operation in the ink jet recording apparatus according to the embodiment of the present invention.
  • 6 is a flowchart illustrating a first operation example of ejection failure detection operation in the ink jet recording apparatus according to the embodiment of the present invention. It is explanatory drawing which shows the example of a display displayed on the operation display part in the case of the 1st operation example of discharge defect detection operation
  • movement. 6 is a flowchart illustrating a second operation example of an ejection failure detection operation in the ink jet recording apparatus according to the embodiment of the present invention.
  • FIG. 10 is a flowchart showing a fourth operation example of the ejection failure detection operation in the ink jet recording apparatus according to the embodiment of the present invention. It is explanatory drawing which shows the example of a display displayed on the operation display part in the case of the 4th operation example of discharge failure detection operation
  • Embodiment 1-1 Configuration Example of Inkjet Recording Apparatus
  • FIG. 1 is a schematic configuration diagram showing the overall configuration of the ink jet recording apparatus.
  • An ink jet recording apparatus 1 shown in FIG. 1 forms (records) an image on paper by ejecting ink from nozzles provided in an ink jet head.
  • the ink jet recording apparatus 1 is a color ink jet recording apparatus that superimposes four color inks of yellow (Y), magenta (M), cyan (C), and black (Bk).
  • the inkjet recording apparatus 1 includes a paper feed unit 10, an image forming unit 20, a paper discharge unit 30, and a control unit 40. Then, the inkjet recording apparatus 1 forms the image data input from the external apparatus 2 (see FIG. 3) on the paper P.
  • the paper feed unit 10 includes a paper feed tray 11 and a paper supply unit 12.
  • the paper feed tray 11 is a plate-like member provided so that a paper P showing an example of a recording medium can be placed thereon.
  • the paper feed tray 11 is provided so as to be movable in the vertical direction according to the number of sheets P placed thereon. The uppermost sheet P in the vertical direction among the plurality of sheets P placed on the sheet feeding tray 11 is held at a position where the sheet is supplied by the sheet supply unit 12.
  • the paper supply unit 12 includes a plurality of (in this example, two) rollers 121 and 122 and a conveyance belt 123.
  • the conveyor belt 123 is formed in an endless shape in which both ends in the longitudinal direction are connected.
  • the conveyor belt 123 is stretched around the rollers 121 and 122.
  • the conveyor belt 123 circulates between the two rollers 121 and 122. Thereby, the paper P placed on the transport belt 123 is transported.
  • the paper supply unit 12 includes a drive unit (not shown) that rotates and drives the rollers 121 and 122 and a supply device that delivers the uppermost paper P placed on the paper feed tray 11 to the transport belt 123. Yes.
  • the paper supply unit 12 conveys the paper P placed on the conveyance belt 123 toward the image forming unit 20 and feeds the paper P to the image forming unit 20.
  • the image forming unit 20 includes an image forming drum 21, a delivery unit 22, a heating unit 23, a head unit 24, a fixing unit 25, an image reading unit 26, a paper discharge unit 27, and a paper reversing unit 28. Have.
  • the image forming drum 21 is formed in a cylindrical shape.
  • the image forming drum 21 is rotated counterclockwise by a drive motor (not shown).
  • the paper P supplied from the paper supply unit 10 is carried on the outer peripheral surface of the image forming drum 21.
  • the image forming drum 21 is rotated to convey the paper P toward the paper discharge unit 30.
  • a heating unit 23, a head unit 24, a fixing unit 25, and an image reading unit 26 are disposed on the outer peripheral surface of the image forming drum 21 so as to face each other.
  • the delivery unit 22 is provided at a position interposed between the paper supply unit 12 of the paper supply unit 10 and the image forming drum 21.
  • the delivery unit 22 includes a claw portion 221 and a cylindrical delivery drum 222.
  • the claw portion 221 carries one end of the paper P conveyed by the paper supply unit 12.
  • the transfer drum 222 guides the paper P carried on the claw portion 221 toward the image forming drum 21. As a result, the paper P is delivered from the paper supply unit 12 to the outer peripheral surface of the image forming drum 21 via the delivery unit 22.
  • the heating unit 23 is disposed on the downstream side of the transfer drum 222 in the conveyance direction of the paper P.
  • the heating unit 23 includes, for example, a heating wire and generates heat in response to energization. Under the control of the control unit 40, the heating unit 23 generates heat so that the paper P carried on the image forming drum 21 and passing through the vicinity of the heating unit 23 has a predetermined temperature.
  • a temperature sensor (not shown) is provided in the vicinity of the heating unit 23.
  • the temperature sensor detects the temperature near the heating unit 23.
  • the control part 40 controls the temperature of the heating part 23 based on the temperature information which the temperature sensor detected.
  • a head unit 24 is provided on the downstream side in the conveyance direction of the paper P in the heating unit 23.
  • Four head units 24 are provided for yellow (Y), magenta (M), cyan (C), and black (Bk).
  • the four head units 24 are arranged in the order of yellow, magenta, cyan, and black from the upstream side in the transport direction of the paper P.
  • the head unit 24 is set to a length (width) that covers the entire sheet P in a direction (width direction) orthogonal to the conveyance direction of the sheet P. That is, the ink jet recording apparatus 1 is a one-pass line head type ink jet recording apparatus.
  • the four head units 24 have the same configuration, except that the colors of the ejected inks are different.
  • FIG. 2 is a plan view showing the head unit 24 as viewed from the paper side.
  • the head unit 24 has a plurality (16 in this example) of inkjet heads 242.
  • the two inkjet heads 242 constitute a set and constitute one inkjet module 243. Therefore, eight ink jet modules 243 are provided in the head unit 24 of this example.
  • the eight inkjet modules 243 are arranged in two rows along the transport direction of the paper P.
  • Four rows of inkjet modules 243 are arranged side by side along a direction (width direction) orthogonal to the transport direction of the paper P.
  • the eight inkjet modules 243 have two rows of inkjet modules 243 arranged in a staggered pattern along the conveyance direction of the paper P.
  • positioning of the inkjet module 243 are not limited to what was mentioned above, You may arrange
  • the inkjet head 242 has a plurality of nozzles 244. Then, the inkjet head 242 ejects ink from the nozzle 244 toward the paper P. As a result, an image is formed on the paper P carried on the image forming drum 21.
  • the fixing unit 25 is disposed on the downstream side of the four head units 24 in the transport direction.
  • a fluorescent tube that radiates ultraviolet rays such as a low-pressure mercury lamp is applied.
  • the fixing unit 25 irradiates the paper P conveyed by the image forming drum 21 with ultraviolet rays, and cures the ink ejected in the form of the paper P.
  • the fixing unit 25 fixes the image formed on the paper P.
  • Fluorescent tubes emitting ultraviolet rays include low-pressure mercury lamps, mercury lamps having an operating pressure of several hundred Pa to 1 MPa, light sources that can be used as germicidal lamps, cold cathode tubes, ultraviolet laser light sources, metal halide lamps, light emitting diodes, etc. Is mentioned.
  • a light source for example, a light emitting diode that can irradiate ultraviolet rays with higher illuminance and consumes less power is more desirable.
  • the fixing unit 25 is not limited to the one that irradiates ultraviolet rays, but may be any one that irradiates energy rays having a property of curing the ink according to the properties of the ink, and the light source also has the wavelength of the energy rays. It is replaced depending on Further, the fixing unit 25 is not limited to the unit that irradiates light such as ultraviolet rays. As the fixing unit, for example, various methods such as a method in which the ink is dried by applying heat to the paper or a liquid that causes a chemical change in the ink is applied can be applied.
  • an image reading unit 26 is disposed on the downstream side of the fixing unit 25 in the transport direction.
  • the image reading unit 26 includes an inline sensor in which a plurality of detection elements are arranged along a direction (width direction) orthogonal to the conveyance direction of the paper P, and is formed on the paper P by the head unit 24 and the fixing unit 25. Scanned images.
  • the read image data is sent to the control unit 40. Note that the interval between the detection elements constituting the image reading unit 26 is set wider than the interval between the nozzles 244 of the inkjet head 242. That is, the resolution of the image reading unit 26 is set to be coarser than the resolution of the head unit 24.
  • a paper discharge unit 27 and a paper reversing unit 28 are provided on the downstream side in the transport direction of the image reading unit 26.
  • the paper discharge unit 27 conveys the paper P conveyed by the image forming drum 21 toward the paper discharge unit 30.
  • the paper discharge unit 27 includes a cylindrical separation drum 271 and a discharge belt 272.
  • the separation drum 271 separates the paper P carried on the image forming drum 21 from the outer peripheral surface of the image forming drum 21.
  • the separation drum 271 guides the paper P to the discharge belt 272 or the paper reversing unit 28.
  • the separation drum 271 guides the paper P to the discharge belt 272 when performing face-up discharge in single-sided image formation.
  • the separation drum 271 guides the paper P to the paper reversing unit 28 when performing face-down paper discharge and double-sided image formation in single-sided image formation.
  • the discharge belt 272 is formed in an endless manner like the transport belt 123 of the paper supply unit 12.
  • the discharge belt 272 is rotatably supported by a plurality of rollers.
  • the discharge belt 272 sends the paper P delivered by the separation drum 271 to the paper discharge unit 30.
  • the paper reversing unit 28 includes a plurality of reversing rollers 281 and 282 and a reversing belt 283.
  • the paper reversing unit 28 reverses the front and back of the paper P guided by the separation drum 271 and conveys the paper P to the paper discharge unit 27.
  • the paper P is conveyed to the paper discharge unit 30 with the surface on which the image is formed by the paper discharge unit 27 facing downward in the vertical direction.
  • the paper reversing unit 28 reverses the front and back of the paper P guided by the separation drum 271 and conveys it again to the outer peripheral surface of the image forming drum 21.
  • the paper P is conveyed by the image forming drum 21 and again passes through the heating unit 23, the head unit 24, the fixing unit 25, and the image reading unit 26.
  • the paper discharge unit 30 stores the paper P sent out from the image forming unit 20 by the paper discharge unit 27.
  • the paper discharge unit 30 includes a flat paper discharge tray 31. Then, the paper discharge unit 30 places the paper P on which an image is formed on the paper discharge tray 31.
  • FIG. 3 is a block diagram showing the configuration of the control system of the inkjet recording apparatus 1.
  • the inkjet recording apparatus 1 includes a control unit 40.
  • the control unit 40 includes, for example, a CPU (Central Processing Unit) 41, a RAM (Random Access Memory) 42 used as a work area of the CPU 41, and a ROM (Read Only Memory) 43 for storing programs executed by the CPU 41 and the like. And having. Further, the control unit 40 includes a storage unit 44 including a hard disk drive (HDD) as a mass storage device.
  • the storage unit 44 stores image data read by the image reading unit 26, a test chart 80 (see FIG. 5A) for detecting ejection failure of the nozzle 244, and information for performing ejection failure detection operation of the nozzle 244. Stored.
  • HDD hard disk drive
  • the ink jet recording apparatus 1 also includes a transport driving unit 51 that drives a transport system such as the image forming drum 21, the paper discharge unit 27, and the paper reversing unit 28, an operation display unit 52, and an input / output interface 53. ing.
  • a transport driving unit 51 that drives a transport system such as the image forming drum 21, the paper discharge unit 27, and the paper reversing unit 28, an operation display unit 52, and an input / output interface 53.
  • the CPU 41 of the control unit 40 is connected to the heating unit 23, the head unit 24, the fixing unit 25, the image reading unit 26, the RAM 42, the ROM 43, and the storage unit 44 through the system bus 54, respectively, and controls the entire apparatus. Further, the CPU 41 is connected to the transport drive unit 51, the operation display unit 52, and the input / output interface 53 via the system bus 54.
  • the operation display unit 52 is a touch panel formed of a display such as a liquid crystal display (LCD) or an organic ELD (Electro Luminescence Display).
  • the operation display unit 52 displays an instruction menu for the user, information on the discharge detection operation of the nozzle 244, information on the acquired image data, and the like.
  • the operation display unit 52 includes a plurality of keys, and has a role as an input unit that receives input of various instructions, data such as characters and numbers by user key operations.
  • the input / output interface 53 is connected to an external device 2 such as a PC (personal computer) or a facsimile machine.
  • the input / output interface 53 receives image data from the external device 2.
  • the input / output interface 53 outputs the received image data to the control unit 40.
  • the control unit 40 performs image processing on the image data received from the input / output interface 53.
  • the control unit 40 performs image processing such as shading correction, image density adjustment, and image compression on the received image data as necessary.
  • the head unit 24 receives the image data image-processed by the control unit 40 and forms a predetermined image on the paper P based on the image data. Specifically, the head unit 24 drives the head driving unit 241 to discharge ink from the inkjet head 242 to a predetermined position.
  • the image formed on the paper P by the head unit 24 is read by the image reading unit 26, and the image data is sent to the control unit 40. Further, when performing the ejection failure operation of the nozzle 244, the control unit 40 determines the nozzle 244 in which ejection failure has occurred based on the image data sent from the image reading unit 26. Then, the control unit 40 performs the correction process of the head unit 24 by increasing the amount of ink discharged from the nozzle 244 adjacent to the nozzle 244 in which the discharge failure has occurred, for example.
  • FIG. 4 is an explanatory diagram illustrating a display example displayed on the operation display unit 52.
  • FIG. 4 shows a display example displayed when the ejection failure detection operation of the nozzle 244 is performed.
  • a test chart insertion menu 522 for inputting whether or not to insert a printing (formation) operation of the test chart 80 (FIG. 5A) and an ejection failure (nozzle of the nozzle 244) are displayed on the operation display unit 52.
  • a nozzle missing menu 523 for inputting an operation when the missing) is detected is displayed.
  • test chart insertion menu 522 an off button 522a for not inserting, a radio button including an interval button 522b for performing insertion and an automatic button 522d, and a pull-down menu 522c are displayed as a graphical user interface.
  • the pull-down menu 522c a number for selecting an interval (specified number) for inserting the test chart 80 is displayed.
  • the pull-down menu 522c is input when the interval button 522b is selected.
  • the interval for inserting the test chart 80 can be automatically set by the control unit 40 or arbitrarily set by the user.
  • radio buttons including a pause button 523a and a continuation button 523b are displayed.
  • the control unit 40 stops the operation of the inkjet recording apparatus 1.
  • the continuation button 523b is selected, the control unit 40 continues the image forming operation in the inkjet recording apparatus 1 even when the ejection failure of the nozzle 244 is detected.
  • the display example displayed on the operation display unit 52 displayed when performing the discharge failure detection operation of the nozzle 244 is not limited to that shown in FIG.
  • Examples of the display displayed on the operation display unit 52 include, for example, numbers from 0 to 9 for the user to arbitrarily input the interval (specified number) for inserting the test chart 80, and the nozzle 244 in which ejection failure has occurred. It is possible to apply various other display examples such as information indicating the position of the.
  • the display example shown in FIG. 4 may be displayed on the display unit of the external apparatus 2 in addition to the operation display unit 52.
  • FIG. 5A is an explanatory diagram showing the test chart 80
  • FIG. 5B is an explanatory diagram showing an enlarged range S shown in FIG. 5A.
  • the test chart 80 is formed on the entire sheet of paper P.
  • the test chart 80 includes a first chart group 81Y, a second chart group 81M, a third chart group 81C, and a fourth chart group 81Bk from the upstream side in the conveyance direction of the paper P.
  • the first chart group 81Y is formed by the head units 24 that discharge yellow (Y) ink among the four head units 24.
  • the second chart group 81 ⁇ / b> M is formed by the head unit 24 that ejects magenta (M) ink among the four head units 24.
  • the third chart group 81 ⁇ / b> C is formed by the head unit 24 that discharges cyan (C) ink among the four head units 24.
  • the fourth chart group 81Bk is formed by the head units 24 that discharge black (Bk) ink among the four head units 24.
  • the first chart group 81Y, the second chart group 81M, the third chart group 81C, and the fourth chart group 81Bk each include a plurality (eight in this example) of test patterns 81. That is, the same number of test patterns 81 as the ink jet modules 243 provided in the head unit 24 are formed.
  • the eight test patterns 81 are formed corresponding to the positions arranged in the head unit 24 in the eight inkjet modules 243. That is, the eight test patterns 81 are arranged in a staggered pattern in which two rows of test patterns 81 are staggered along the conveyance direction of the paper P.
  • the front end side of the paper P in the test pattern 81 corresponds to the ink jet head 242 arranged on the upstream side in the transport direction of the paper P among the two ink jet heads 242 constituting the ink jet module 243.
  • the rear end side of the paper P in the test pattern 81 corresponds to the ink jet head 242 arranged on the downstream side in the transport direction of the paper P among the two ink jet heads 242 constituting the ink jet module 243.
  • test chart 80 By forming the test chart 80 on the entire sheet of paper P, it is possible to easily detect the inkjet head 242 having the nozzles 244 in which ejection failure has occurred. Further, even when the image reading unit 26 having a resolution coarser than the resolution of the head unit 24 is used, the ejection failure of the nozzle 244 can be accurately detected. This eliminates the need to improve the resolution of the image reading unit 26.
  • the test pattern 81 is formed by a plurality of pattern lines 81a.
  • the positions of the plurality of pattern lines 81a correspond to the positions where the plurality of nozzles 244 provided in the inkjet head 242 are provided. Therefore, when a missing T1 occurs in the pattern line 81a, it can be determined that a discharge failure has occurred in the nozzle 244 at the position corresponding to the missing T1. As a result, the position of the nozzle 244 where the ejection failure has occurred can be accurately detected.
  • nozzle omission was cited as an example of ejection failure
  • the present invention is not limited to this.
  • ejection failure include, for example, ejection bend in which landing in the width direction deviates from an ideal landing position of ink, For example, there is a discharge delay in which the discharge timing is delayed due to the fact that a normal signal is not transmitted normally or the nozzle 244 of the inkjet head 242 wants to react as expected to the control signal.
  • the ejection failure may include a plurality of phenomena in which ink cannot be ejected normally.
  • FIG. 6 is an explanatory diagram showing a first operation example of nozzle discharge failure detection
  • FIG. 7 is a flowchart showing a first operation example of nozzle discharge failure detection
  • FIG. 8 is a flowchart showing nozzle discharge failure detection. The example of a display displayed on the operation display part 52 in the example of 1 operation
  • a normal number of images are formed (20 in the example shown in FIG. 6), and then a test chart 80 is printed on one sheet.
  • the test chart 80 is formed at regular intervals (20 sheets).
  • the image forming process is continued until the predetermined job is completed or a job end instruction is input from the user.
  • the user performs defect detection setting via the operation display unit 52 (step S11). Specifically, as shown in FIG. 8, the user inputs an interval button 522 b of the test chart insertion menu 522 in the operation display unit 52. In addition, the user sets an interval for inserting the test chart 80 by operating the pull-down menu 522c. In the first operation example, “20” is selected as the interval (specified number) for inserting the test chart 80. Thus, the test chart 80 is formed after 20 normal image forming processes are performed. Further, the user selects the continuation button 523b of the nozzle shortage correspondence menu 523. The defect detection setting input by the user is stored in the storage unit 44.
  • the defect detection setting in step S11 may be input using the input unit of the external device 2.
  • the control unit 40 starts the operation of forming a predetermined image on the paper P based on the image formation processing information (job information) input in advance.
  • the control unit 40 controls the entire apparatus and forms a normal image on the paper P (step S12).
  • the control unit 40 controls the transport driving unit 51 to discharge the paper P on which the image is formed to the paper discharge unit 30 (step S13).
  • the control unit 40 counts the number of sheets P on which the normal image is formed and stores it in the storage unit 44.
  • the storage unit 44 is provided with a test chart insertion counter that counts the number of test charts to be inserted and a job number counter that counts a preset number of jobs. That is, the control unit 40 increases the values of both the test chart insertion counter and the job number counter by “1”.
  • control unit 40 determines whether or not the number of sheets P on which the normal image is formed has reached the specified number set in step S11 (step S14). That is, the control unit 40 determines whether or not the value of the test chart insertion counter among the counters stored in the storage unit 44 has reached a specified number.
  • step S14 If it is determined in step S14 that the specified number has been reached (YES in step S14), the control unit 40 controls the head unit 24 to form the test chart 80 on the entire sheet P (step S14). S15). Further, the control unit 40 sets the value of the test chart insertion counter to “0”.
  • test chart insertion counter may be set in the test chart insertion counter, and the test chart insertion counter may be subtracted each time a normal image is formed.
  • the image reading unit 26 reads the test chart 80 formed on the paper P. Then, the image reading unit 26 outputs the image data to the control unit 40.
  • the control unit 40 detects an ejection failure of the nozzle 244 based on the image data sent from the image reading unit 26. When the ejection failure is detected, the control unit 40 performs a correction process for the head unit 24 by increasing the ejection amount of ink from the nozzle 244 adjacent to the nozzle 244 where the ejection failure has occurred (step S16).
  • the control unit 40 may cause the operation display unit 52 to display information regarding ejection failure, for example, the nozzle 244, the inkjet head 242, the head unit 24, and the like in which ejection failure has occurred.
  • the precision of the correction process in step S16 can be improved.
  • the control unit 40 controls the transport driving unit 51 to discharge the paper P on which the test chart 80 is formed to the paper discharge unit 30 (step S17). Thereby, the user can confirm the presence or absence of ejection failure of the nozzle 244 by visually recognizing the test chart 80.
  • a test is performed on the paper P placed on the paper discharge tray 31 of the paper discharge unit 30. It is also possible to make a pass / fail judgment by judging the state of the image of the paper P before and after the paper P on which the chart 80 is formed.
  • the user can instruct the control unit 40 via the operation display unit 52 or the external device 2 whether to continue the job by determining the state of the paper P on which the test chart 80 is formed. it can.
  • job processing in the inkjet recording apparatus 1 that is, image formation processing is continuously performed. Therefore, it is possible to prevent a reduction in job processing speed in the inkjet recording apparatus 1.
  • step S14 If it is determined in step S14 that the specified number has not been reached (NO determination in step S14), the control unit 40 moves the process to step S18.
  • control unit 40 determines whether or not the job is finished (step S18). Specifically, the control unit 40 determines whether or not the job number counter value has reached the number of pre-input image formation processing information (job information), or a job end instruction is issued from the user after step S17. Determine whether it was entered.
  • job information pre-input image formation processing information
  • job end instruction is issued from the user after step S17. Determine whether it was entered.
  • step S18 If it is determined in step S18 that the job has not ended (NO determination in step S18), the control unit 40 returns to step S12 and continues the job. If it is determined in step S18 that the job has ended (YES determination in step S18), the control unit 40 ends the image forming process in the inkjet recording apparatus 1. By performing such a process, the first operation for detecting defective ejection of nozzles in the inkjet recording apparatus 1 is completed.
  • FIG. 9 is a flowchart illustrating a second operation example of nozzle ejection failure detection
  • FIG. 10 illustrates a display example displayed on the operation display unit 52 in the second operation example of nozzle ejection failure detection.
  • the user performs defect detection setting via the operation display unit 52 (step S21). Specifically, as shown in FIG. 10, the user inputs the interval button 522b of the test chart insertion menu 522 and operates the pull-down menu 522c to display the test chart 80 as in the first operation example. Set the insertion interval. Then, the user selects the pause button 523a of the nozzle shortage correspondence menu 523. This defect detection setting is stored in the storage unit 44.
  • control unit 40 controls the entire apparatus and forms a normal image on the paper P (step S22). Then, the control unit 40 controls the transport driving unit 51 to discharge the paper P on which the image is formed to the paper discharge unit 30 (step S23).
  • control unit 40 determines whether or not the number of sheets P on which the normal image is formed has reached a specified number (step S24). If it is determined in step S24 that the specified number has been reached (YES in step S24), the control unit 40 controls the head unit 24 to form a test chart 80 (step S25).
  • test chart 80 is read by the image reading unit 26, and when correction is necessary, correction processing is performed (step S26). Then, the paper P on which the test chart 80 is formed is discharged (step S27).
  • the control unit 40 temporarily stops the job processing in the inkjet recording apparatus 1 and causes the operation display unit 52 to display a processing selection screen (step S28). Then, the user determines the state of the test chart 80 formed on the paper P. For example, the ejection failure state of the nozzle 244 is confirmed based on the size and number of missing T1 (see FIG. 5B) generated in the test chart 80. If the user determines that the correction process in step S26 is insufficient based on the state of the test chart 80 formed on the paper P, the user inputs a job end instruction via the operation display unit 52 or the external device 2. .
  • step S24 If it is determined in step S24 that the specified number has not been reached (NO determination in step S24), the control unit 40 shifts the process to step S29.
  • step S29 determines whether or not the job is completed. If it is determined in step S29 that the job has not ended (NO determination in step S29), the control unit 40 returns to step S22 and continues the job. If it is determined in step S29 that the job has ended (YES determination in step S29), the control unit 40 ends the image forming process in the inkjet recording apparatus 1. Thereby, the second operation for detecting ejection failure of the nozzle 244 in the inkjet recording apparatus 1 is completed.
  • the process of displaying the apparatus suspension and process selection screen in step S28 is not limited to that performed every time the test chart 80 is formed.
  • a process of displaying a pause and process selection screen in step S28 is performed. It may be. Thereby, it is possible to prevent the job processing speed in the ink jet recording apparatus 1 from being lowered.
  • FIG. 11 is an explanatory diagram showing a third operation example of nozzle discharge failure detection
  • FIG. 12 is a flowchart showing a third operation example of nozzle discharge failure detection
  • FIG. 13 is a flowchart showing nozzle discharge failure detection. The example of a display displayed on the operation display part 52 in the operation example of 3 is shown.
  • test chart 80 is formed at a constant interval.
  • present invention is not limited to this. You may change it inside.
  • a deaeration device for removing bubbles contained in the ink is provided in the flow path through which the ink flows from the tank in which the ink is stored to the nozzle 244.
  • the ink jet recording apparatus 1 circulates ink between the ink jet head 242 and the tank, thereby removing bubbles contained in the ink using a deaeration device.
  • the interval (10 sheets) for forming the test chart 80 first is shortened, and the intervals (20 sheets, 40 sheets) for forming the test chart 80 thereafter are shortened. It is preferable. Thereby, the number of sheets P on which the test chart 80 is formed can be reduced. Further, the interval for forming the test chart 80 may be increased as the number of normal images increases (from 20 to 40).
  • the change of the interval for forming the test chart 80 may be performed by the user or the control unit 40.
  • the third operation example an example will be described in which the user changes the interval at which the user forms the test chart 80, that is, the specified number of normal images formed between the test charts 80. Note that description of the same processing as in the first operation example and the second operation example is omitted.
  • the user performs defect detection setting via the operation display unit 52 (step S31). Specifically, as shown in FIG. 13, the user selects an automatic button 522d of the test chart insertion menu 522. Further, as in the second operation example, the user selects the pause button 523a of the nozzle shortage correspondence menu 523. This defect detection setting is stored in the storage unit 44.
  • control unit 40 controls the entire apparatus to form a normal image on the paper P (step S32). Then, the control unit 40 controls the transport driving unit 51 to discharge the paper P on which the image is formed to the paper discharge unit 30 (step S33).
  • control unit 40 determines whether or not the number of sheets P on which the normal image is formed has reached a specified number (step S34). If it is determined in step S34 that the specified number has been reached (YES determination in step S34), the control unit 40 controls the head unit 24 to form a test chart 80 (step S35).
  • test chart 80 is read by the image reading unit 26, and when correction is necessary, correction processing is performed (step S36). Then, the paper P on which the test chart 80 is formed is discharged (step S37).
  • control unit 40 temporarily stops the job processing in the inkjet recording apparatus 1 and causes the operation display unit 52 to display a processing selection screen (step S38).
  • a processing selection screen displayed in the process of step S38, information on whether or not to change the specified number of sheets is displayed to the user.
  • the user determines the state of the test chart 80 and inputs information such as a change in the specified number of sheets into which the test chart 80 is inserted, a job end instruction or a continuation instruction.
  • the user determines the state of the test chart 80, and when the number of nozzles 244 in which ejection failure has occurred is small and the degree is small, the prescribed number of normal images until the test chart 80 is formed is increased. The interval for forming 80 is increased. Alternatively, when the number of nozzles 244 in which ejection failure has occurred is large and the degree is large, the prescribed number of normal images until the test chart 80 is formed is reduced, and the interval at which the test chart 80 is formed is shortened.
  • control unit 40 determines whether or not the specified number has been updated (step S39). The control unit 40 determines whether or not the user has input to change the specified number of sheets, which is the interval at which the test chart 80 is inserted. If it is determined in step S39 that the specified number has been updated (YES in step S39), the control unit 40 updates the specified number (step S41). Then, the control unit 40 returns to the process of step S32 and continues the job.
  • step S39 If it is determined in step S39 that the specified number has not been updated (NO determination in step S39), the control unit 40 moves the process to step S42.
  • step S34 If it is determined in step S34 that the specified number has not been reached (NO determination in step S34), the control unit 40 moves the process to step S42.
  • the control unit 40 determines whether the job is finished (step S42). If it is determined in step S42 that the job has not ended (NO determination in step S42), the control unit 40 returns to step S32 and continues the job. If it is determined in step S42 that the job has ended (YES determination in step S42), the control unit 40 ends the image forming process in the inkjet recording apparatus 1. Thereby, the third operation for detecting defective ejection of the nozzle 244 in the inkjet recording apparatus 1 is completed.
  • FIG. 14 is an explanatory diagram showing a fourth operation example of nozzle discharge failure detection
  • FIG. 15 is a flowchart showing a third operation example of nozzle discharge failure detection
  • FIG. 16 is a flowchart showing nozzle discharge failure detection. The example of a display displayed on the operation display part 52 in the operation example of 3 is shown.
  • the deaeration device that removes the bubbles of ink flowing in the flow path can always exhibit the same effect by reducing the capacity of the pump due to deterioration over time or clogging the path for discharging bubbles. Is not limited. Furthermore, the amount of bubbles that can be removed by the deaeration device changes due to a change in the air content contained in the ink in the flow path. As a result, the frequency of occurrence of ejection failure changes, so it is preferable to change the interval for forming the test chart 80 according to the state of ejection failure.
  • the interval for forming the test chart 80 may be increased (for example, 10 to 50).
  • control unit 40 changes the interval at which the test chart 80 is formed, that is, the change in the specified number of normal images formed between the test charts 80 based on the state of the test chart 80 will be described. To do.
  • the user performs defect detection setting via the operation display unit 52 (step S51). Specifically, as shown in FIG. 16, the user selects an automatic button 522d of the test chart insertion menu 522. Further, the user selects the continuation button 523b of the nozzle shortage correspondence menu 523 as in the first operation example. This defect detection setting is stored in the storage unit 44.
  • the control unit 40 stores a threshold value for determining the change of the specified number in the storage unit 44.
  • the threshold value is a first threshold value that is a threshold value for the number of times that no defect is detected in the detection result of the defect detection for the nozzle 244, and a threshold value that is a threshold value for the number of times that a defect is detected in the detection result for the defect detection of the nozzle 244.
  • the first threshold value and the second threshold value may be the same number, and the first threshold value and the second threshold value may be set to different numbers.
  • control unit 40 controls the entire apparatus and forms a normal image on the paper P (step S52). Then, the control unit 40 controls the transport driving unit 51 to discharge the paper P on which the image is formed to the paper discharge unit 30 (step S53).
  • control unit 40 determines whether or not the number of sheets P on which the normal image is formed has reached a specified number (step S54). When it is determined in step S54 that the specified number has been reached (YES determination in step S54), the control unit 40 controls the head unit 24 to form the test chart 80 (step S55).
  • the test chart 80 is read by the image reading unit 26, and if correction is necessary, correction processing is performed (step S56). Further, the control unit 40 determines the presence / absence of the nozzle 244 in which ejection failure has occurred based on the image data sent from the image reading unit 26. When the ejection failure is detected, the control unit 40 performs the correction process of the head unit 24 by increasing the ejection amount of ink from the nozzle 244 adjacent to the nozzle 244 where the ejection failure has occurred. Further, the control unit 40 stores information related to failure detection in the storage unit 44, for example, the number of nozzles 244 in which ejection failure has occurred, the degree of ejection failure, the time at which ejection failure was detected, and the like.
  • control unit 40 determines whether or not the history (number of times) of no ejection failure is equal to or longer than a certain period (first threshold) based on the information related to failure detection stored in the storage unit 44 (step S58). .
  • the control unit 40 increases the specified number of sheets and stores the increased specified number in the storage unit ( Step S59). Then, the control unit 40 returns to the process of step S52 and continues the job.
  • step S58 when it is determined that the history of no defect is less than a certain period (NO determination of step S58), the control unit 40 performs ejection based on the information regarding the defect detection stored in the storage unit 44. It is determined whether or not the defect history (number of times) is longer than a certain period (second threshold) (step S61). In the process of step S61, when it is determined that there is a history of defects for a certain period (YES determination in step S61), the control unit 40 decreases the specified number of sheets and stores the current specified number of sheets in the storage unit ( Step S61). Then, the control unit 40 returns to the process of step S52 and continues the job.
  • step S61 If it is determined in step S61 that the history of defects is less than a certain period (NO determination in step S61), the control unit 40 does not change the interval for forming the test chart 80, that is, the specified number of sheets. Then, the process proceeds to step S63.
  • step S54 If it is determined in step S54 that the specified number has not been reached (NO determination in step S54), the control unit 40 moves the process to step S63.
  • the control unit 40 determines whether or not the job is finished (step S63). If it is determined in step S63 that the job has not ended (NO determination in step S63), the control unit 40 returns to step S52 and continues the job. If it is determined in step S63 that the job has ended (YES determination in step S63), the control unit 40 ends the image forming process in the inkjet recording apparatus 1. As a result, the fourth operation for detecting ejection failure of the nozzle 244 in the inkjet recording apparatus 1 is completed.
  • step S58 and S59 when the number of ejection failures does not exceed the threshold, the process of increasing the specified number (steps S58 and S59), and the number of ejection failures exceeds the threshold.
  • step S61 and step S62 the example which performs both the process which reduces a regulation number in the case was demonstrated, it is not limited to this.
  • step S62 may be performed.
  • the present invention is not limited to this, and examples of the recording medium include various other materials such as fabrics, plastic films, and glass plates. A recording medium can be applied.
  • first chart group 81M ... second chart group
  • 81C Third chart group
  • 81Bk Fourth chart group
  • 81a Pattern line
  • 242 Ink Ttoheddo
  • 243 ... ink jet module
  • 244 ... nozzle
  • P paper (recording medium)

Landscapes

  • Ink Jet (AREA)

Abstract

L'invention concerne un dispositif d'enregistrement à jet d'encre comprenant une tête à jet d'encre, une unité de lecture d'image et une unité de commande. L'unité de lecture d'image présente une résolution inférieure à la résolution de la tête à jet d'encre, et lit une image formée sur un support d'enregistrement par la tête à jet d'encre. L'unité de commande commande la tête à jet d'encre, et après la formation d'une image normale sur un nombre spécifié de feuilles, l'unité de commande amène un graphique de test à être formé sur une feuille du support d'enregistrement, un tel graphique servant à détecter des dysfonctionnements de la décharge dans une pluralité de buses.
PCT/JP2018/000076 2017-02-28 2018-01-05 Dispositif d'enregistrement à jet d'encre et procédé de commande de dispositif d'enregistrement à jet d'encre Ceased WO2018159097A1 (fr)

Priority Applications (1)

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JP2019502479A JP7017160B2 (ja) 2017-02-28 2018-01-05 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制御方法

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JP2017-035803 2017-02-28

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WO2018159097A1 true WO2018159097A1 (fr) 2018-09-07

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JP2021030690A (ja) * 2019-08-29 2021-03-01 コニカミノルタ株式会社 画像形成装置および画像形成方法
JP2023104774A (ja) * 2022-01-18 2023-07-28 富士フイルム株式会社 吐出制御装置、インクジェット印刷システム、印刷条件決定方法及びプログラム
EP4311679A1 (fr) 2022-07-29 2024-01-31 Brother Kogyo Kabushiki Kaisha Contrôleur, système de formation d'image, procédé de détection de buse de défaut de décharge et support

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JP7392333B2 (ja) 2019-08-29 2023-12-06 コニカミノルタ株式会社 画像形成装置および画像形成方法
JP2023104774A (ja) * 2022-01-18 2023-07-28 富士フイルム株式会社 吐出制御装置、インクジェット印刷システム、印刷条件決定方法及びプログラム
EP4311679A1 (fr) 2022-07-29 2024-01-31 Brother Kogyo Kabushiki Kaisha Contrôleur, système de formation d'image, procédé de détection de buse de défaut de décharge et support

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