JP2005161653A - Method for detecting defective discharge aperture of liquid droplet discharge device and detection mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a defective discharge aperture to be easily detected and enhance the detection precision of the defective discharge aperture. <P>SOLUTION: In this method for detecting a defective discharge aperture of a liquid droplet discharge device, the detection mechanism comprises the following means: a suction means, with a suction aperture, which is installed at each one of openings of the discharge apertures and can approach any other different discharge aperture in a non-contact manner, at a head having a plurality of the discharge apertures; a measuring means which measures an internal atmospheric pressure of a recovery bucket as a separate member to be applied to the suction apertures of the suction means more widely than the openings of the discharge apertures; a judging means which judges the presence of a clogging in a flow path upto the opening at the appropriate discharge aperture, when a pressure difference between the measurements and an atmospheric pressure reaches a higher level than a threshold value during a suction process; and an informing means informing it. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid droplet ejection apparatus having a configuration in which bubbles, dust, and the like in the vicinity of an ejection port are removed by sucking liquid from a ejection unit that is provided on a head and ejects liquid droplets onto a recording member. The present invention relates to a method and a mechanism for detecting a discharge port.

  As one method for recording on a recording member, there is an ink jet method in which droplets are ejected from ejection ports provided in a head for recording. Among those employing this method, printers for printing color images on paper are best known.

  However, the ink jet method is applied not only to printers but also to manufacturing apparatuses such as a color filter manufacturing apparatus and a DNA chip manufacturing apparatus because of the advantage that minute droplets can land on a predetermined place.

  In such an ink jet type droplet discharge device, it is necessary to detect a defective droplet discharge port in order to maintain stable recording. There are roughly the following two methods.

  The first method is a method in which an image is formed on a recording medium and a user confirms whether or not there is a defective image with the naked eye or a magnifying glass. This method is generally used because it can determine a defective ejection port without adding a special structure.

  The second method is a photo-interrupter method as described in Patent Document 1, for example. This is because light is emitted from the light emitting element to the light receiving element, and ink is ejected so as to cut off the optical axis. When the optical axis is cut off, ink is present, and when the optical axis is not cut off, it is determined that there is no ink. It is a method to do.

Japanese Patent Laid-Open No. 6-24008

  However, in the conventional method for detecting a defective discharge port as described above, the first method has a problem in that the determination of the defective discharge port is based on the subjectivity of the user and erroneous determination is likely to occur.

  In the second method, there is a problem that the cost increases with the complexity of the configuration, and there is also a problem that it is difficult to detect a small droplet.

  In any of the methods, an extra amount of ink other than that used for the main drawing is consumed, and an extra amount of recording medium that is used only for checking the defective ejection port is required. In addition, extra time and human resources are required for the drawing process.

  If this ink or recording medium is inexpensive, it will not be a problem, but expensive liquids (constituent materials are expensive; biological materials, noble metal ion coordination complexes, ultra-highly purified water, new synthetic materials, etc.) When using an expensive recording medium (quartz glass, a precious metal substrate, a valuable recording medium sample under development), there is a problem in terms of cost.

  Furthermore, in an ink jet type droplet discharge device such as a conventional ink jet printer, when a defective discharge port is detected, recovery processing such as suction is performed in order to maintain stable recording. Since the ink at the outlet is sucked in the same recovery tank, there is also a problem in that a large amount of liquid is wasted by sucking droplets from the ejection ports that are not defective ejection ports.

  However, as the above-mentioned solution, a liquid droplet characterized by suction means having suction ports that can approach each other of the discharge ports in a non-contact manner with respect to a head having a plurality of discharge ports. There is an invention called a discharge device, and the present invention uses a device capable of sucking each individual discharge port, and individually recovers each discharge port before actually forming an image. The problem of the method was solved.

In order to achieve the above object, the present invention has a suction port capable of approaching another different discharge port in a non-contact manner for each one of the openings of the discharge port with respect to a head having a plurality of discharge ports. A suction means, wherein the separate recovery collar can apply the suction port wider than the opening of the discharge port, and a measuring means for measuring the pressure in the recovery bowl; Sometimes when the pressure difference between the measured value and the atmospheric pressure fluctuates above a certain threshold value, the determination means for determining that the flow path up to the opening is clogged at the corresponding discharge port and the notification for notifying it Means.

  According to the present invention, by individually sucking ink at all ejection ports and measuring the atmospheric pressure difference, the difference between the differential pressure value when normally sucked and the case where clogging occurs and normal suction cannot be performed. By the means for comparing with the pressure value, it becomes possible to easily detect the defective discharge port, and the detection accuracy of the defective discharge port is improved.

  According to the present invention, in the droplet discharge device, a suction unit having a suction port capable of approaching another different discharge port in a non-contact manner for each one of the discharge ports with respect to a head having a plurality of discharge ports. And the suction port of the suction means is configured wider than the opening of the discharge port.

  According to the present invention, in the droplet discharge device, a separate recovery hook is provided in the suction means, and the suction port of the recovery hook is configured wider than the opening of the discharge port.

  According to the present invention, in the droplet discharge device, the suction unit is used to suck the liquid from the discharge port provided in the head.

  In the droplet discharge device, the pressure sensor for measuring the differential pressure from the atmospheric pressure is provided in the recovery ridge or the discharge port in the droplet discharge device, and the negative pressure by the suction means is measured in real time and the measured value is transferred. Communication means for storing, storage means for storing, display means for presenting, comparison means for comparing whether or not the liquid can be normally sucked at the time of suction recovery, comparison means for comparing whether the measured value is greater than the threshold value When large, it is configured to notify that the discharge port is clogged and to instruct to stop the suction recovery process at this time.

  Examples of the present invention will be described below.

  A first embodiment of the present invention will be described below with reference to FIGS.

  Since the present invention relates to a suction device section in a droplet discharge device, first, the suction device section will be described below. The suction device unit may be provided separately from or integrally with the droplet discharge device.

  FIG. 1 is a top view of a suction device section in a droplet discharge device according to the present invention. In the present embodiment, the suction device section is configured separately from the droplet discharge device. A side plate 52 is provided on the base plate 51, and a head plate 53 is attached on the side plate 52. A head 54 is attached to the head plate 53 with screws. The head 54 is provided with nine liquid supply ports 55. Each liquid supply port 55 communicates with a separate discharge port. Different liquids are injected into the respective liquid supply ports 55. Therefore, different liquids are discharged from each discharge port.

  2 is a cross-sectional view taken along the line KK of FIG.

  The head 54 is provided with an ejection port 68. An X stage 56 is mounted on the base plate 51. The X stage 56 is provided with a rail 87, and the X stage movable unit 66 moves left and right on the rail 87. A Z stage 57 is attached on the X stage movable portion 66. A Z stage movable portion 67 provided in a movable state on the Z stage 57 moves in the vertical direction with respect to the Z stage 57. A recovery rod 58 is mounted on the Z stage movable part 67. A recovery rod plate 59 is attached to the recovery rod table 58. A recovery rod 60 is provided at a position facing the discharge port 68. The recovery rod 60 is made of a rubber member. The recovery rod 60 is press-fitted into the recovery rod pipe 61. When the recovery rod pipe 61 is configured by a flexible member and the recovery rod pipe 61 and the head 54 are configured to be in close contact, the recovery rod 60 may not be used. In this case, the contact portion of the recovery rod pipe 61 to the head 54 is configured such that each one of the discharge ports 68 can approach another different discharge port 68 in a non-contact state. Further, the suction port of the recovery rod pipe 61 is configured wider than the opening of the discharge port 68.

  The recovery rod pipe 61 is bonded to the recovery rod joint 62. The recovery rod joint 62 is movable with respect to the recovery rod table 58. The recovery rod joint 62 is positioned by inserting the recovery rod joint 62 into a hole provided in the recovery rod plate 59. A recovery rod spring 63 is provided on the outer periphery of the recovery rod joint 62. A recovery rod washer 64 is provided between the recovery rod spring 63 and the recovery rod base 58. A tube 65 is bonded to the recovery rod joint 62.

  The recovery rod 60 comes into contact with the head 54 by raising the Z stage movable portion 67. Further, the recovery rod 58 and the recovery rod washer 64 are raised by raising the Z stage movable portion 67. As a result, the recovery rod spring 63 is compressed, the recovery rod 60 is bent, and the recovery rod 60 and the head 54 are in close contact with each other. Then, by operating a suction pump communicating with the tube 65, the liquid is sucked from the discharge port 68 through the recovery rod 60. By sucking the liquid from the discharge port 68, fine dust, bubbles, and liquid with increased viscosity in the discharge port 68 are removed.

  Next, when the Z stage movable part 67 is lowered, the recovery rod 60 moves away from the head 54.

  The suction operation can be performed from the other two discharge ports 68 by moving the X stage movable portion 66 in the right direction in FIG.

  FIG. 3 is a right side view of FIG. As shown in the figure, three recovery rods 60 are provided.

  4 is a cross-sectional view taken along line LL in FIG. Each of the tubes 65 is in communication with the recovery rod 60. Each tube 65 is connected to an atmospheric valve 78. The atmospheric valve 78 is a three-way valve.

  One connecting portion of the atmospheric valve 78 is connected to the atmospheric tube 76. The tip of the atmosphere tube 76 is an atmosphere port 70 and is open to the atmosphere. One connecting portion of the atmospheric valve 78 is connected to the suction pump 69 via a tube. Further, a waste liquid tube 71 is connected to the suction pump 69. The other end of the waste liquid tube 71 is connected to a waste liquid tank 72. One atmospheric valve 78, one suction pump 69, and one waste liquid tank 72 are provided for each recovery bowl 60.

  FIG. 5 is a top view of the head 54 alone. As described above, the head 54 is provided with nine liquid supply ports 55. 6 is a cross-sectional view taken along line MM in FIG. As described above, the discharge port 68 is provided in the head 54, and each liquid supply port 55 communicates with a separate discharge port 68.

  7A and 7B are flow charts when liquid is sucked from the discharge port 68 provided in the head 54. FIG. A pressure sensor 50 that measures the internal atmospheric pressure is attached to the recovery rod 60.

  Reference numeral 1 denotes a standby state.

  2 shows the state at the time of suction.

  3 shows the state at the time of recovery 桶 release.

  7A shows a state in which there is no clogging between the liquid supply port 55 and the discharge port 68 of the head, and FIG. 7B shows that there is a clogging between the supply port 55 and the discharge port 68 of the head. It shows a state of no communication.

  In the standby time (1), different liquids are injected into the liquid supply ports 55.

  The recovery rod 60 is separated from the head 54. The recovery rod 60 can approach each of the discharge ports 68 in a non-contact state with the other different discharge ports 68. The suction port of the recovery rod 60 is wider than the opening of the discharge port 68. A tube 65 communicating with the recovery rod 60 is connected to the atmospheric valve 78. During standby, the tube 65 communicates with the atmospheric tube 76 via the atmospheric valve 78. The atmosphere port 70 of the atmosphere tube 76 is open to the atmosphere. At this time, since the measured value of the pressure sensor 50 is the same value as the atmospheric pressure, the differential pressure is measured as zero.

At the time of suction (2-FIG. 7A), the recovery rod 60 is in close contact with the head 54. The atmospheric valve 78 is an electromagnetic valve, and can change the connecting portion that communicates with an electric signal. After the recovery rod 60 is in close contact with the head 54, the atmospheric valve 78 operates so as to connect the tube 65 and the suction pump 69. Thereafter, by operating the suction pump 69, the liquid is sucked from the discharge port 68 through the recovery rod 60. As a result, the sucked liquid is discharged from the waste liquid tube 71 to the waste liquid tank 72. At this time, the measurement value of the pressure sensor 50 is measured by swinging to the negative pressure side from the atmospheric pressure. The measured value at this time is P (A).

  At the time of suction (2-FIG. 7B), the recovery rod 60 is in close contact with the head 54 as in (2-FIG. 7A). The atmospheric valve 78 is an electromagnetic valve, and can change the connecting portion that communicates with an electric signal. After the recovery rod 60 is in close contact with the head 54, the atmospheric valve 78 operates to connect the tube 65 and the suction pump 69. Thereafter, the suction pump 69 is operated. However, in the head 54, since the clogging is present in the flow path from the liquid supply port to the discharge port 68, the liquid can be sucked from the discharge port 68 through the recovery rod 60. As a result, the liquid is not discharged into the tube 65. At this time, the measurement value of the pressure sensor 50 is measured by swinging largely toward the negative pressure side from the atmospheric pressure. The measured value at this time is P (B).

  At the time of recovery rod release (3), after the operation of the suction pump 69 is completed, the atmospheric valve 78 is operated so as to communicate the tube 65 and the atmospheric tube 76, and then the recovery rod 60 is lowered to move the recovery rod 60 to the head. 54 is further away. At this time, since the measured value of the pressure sensor 50 is the same value as the atmospheric pressure, the differential pressure is measured as zero.

  After the operation of 1, 2 and 3 is completed, the X stage movable part 66 is operated to move the recovery rod 60 and the same operation of 1, 2 and 3 can be performed to suck liquid from all the discharge ports 68. is there. Even if the number of discharge ports 68 is increased, it is possible to perform the same operation by increasing the same configuration in accordance with the number of discharge ports. At this time, since the pressure measurement values at the time of suction are P1, P2, P3,... Pn and all the numbers are measured, whether the state of each discharge port is P (A) or p (B) is as follows. Judgment is made as described above.

| P (A) | <Pth | P (B) | (#)
A differential pressure threshold Pth that satisfies (#) is defined, and a discharge port having a Pn value belonging to the group of P (B) that exceeds this Pth is determined to be clogged. Pth can be changed flexibly depending on the shape and diameter of the flow path from the liquid supply port to the discharge port.

  In addition, it is possible to suck liquid from a part of the plurality of discharge ports 68. As a method, when the recovery rod 60 is in close contact with the discharge port 68 that does not suck the liquid, the atmospheric valve 78 and the suction pump 69 are not operated during the above-described operations of the second and third. When the recovery rod 60 comes into close contact with the discharge port 68 for sucking the liquid, the operations 1, 2 and 3 are performed. By performing such an operation, it is possible to suck the liquid from some of the discharge ports 68.

  Further, by providing the same number of recovery rods 60 as the discharge ports 68 at positions corresponding to the discharge ports 68, and providing the atmospheric valve 78, the suction pump 69, the waste liquid tank 72, etc. corresponding to the recovery ports 60, the X stage movable part Even if 66 is not provided, it is possible to suck liquid from all of the discharge ports 68 or a part of the discharge ports 68.

  Next, the droplet discharge device will be described. FIG. 8 is a perspective view of the droplet discharge device.

  On the surface plate 79, a Y-axis stage 73 and a guide rail 77 are fixed in parallel. An X-axis stage 74 is attached to the movable parts of the Y-axis stage 73 and the guide rail 77, and the X-axis stage 74 is movable in the Y-axis direction. A chuck 75 is fixed to the movable part of the X-axis stage 74. The chuck 75 is connected to a suction pump (not shown) by a tube, and the recording member 84 is adsorbed to the chuck 75 when the suction pump sucks air.

In addition, the columns 82 and 83 are fixed on the surface plate 79, and the columns 82 and 83
The bridges 80 and 81 are fixed to the 83, respectively. The bridges 80 and 81 are fixed by a stay 85, and the support 82
83 and the strength of the bridges 80 and 81 are maintained. A head mounting base 86 is fixed between the bridges 80 and 81, and the head 54 is fixed to the head mounting base 86.

  A liquid is injected into the head 54, suction is performed by the suction unit, and wiping is performed by a wiping mechanism (not shown), and then the head 54 is mounted on the droplet discharge device. By operating the Y-axis stage 73 and the X-axis stage 74 and ejecting droplets from the head 54, the droplets are ejected to a predetermined position of the recording member 84.

  FIG. 9 is a flowchart including a defective ejection port detection process performed by the droplet ejection apparatus until a droplet is ejected onto a recording material to form an image.

  FIG. 9A relates to a method for detecting a defective ejection port, which is performed in a step of performing suction recovery in order to discard the storage liquid in the head in a step of performing an acceptance inspection of the head before using the droplet ejection apparatus.

  FIG. 9B relates to a defective ejection port detection method that is performed in the step of recovering suction in order to draw the liquid to be used at the tip of the ejection port when the droplet ejection apparatus is used.

  In both cases, it is determined whether or not liquid can be sucked individually from the discharge port in the recovery process that is performed as part of the routine work of the droplet discharge device without using extra ink material or recording material. However, the present invention relates to a method for detecting a defective discharge port that detects a discharge failure even if a discharge is attempted, and the present invention does not limit where the suction recovery is performed in the manufacturing process.

  Step 9-1 is a step of delivering a new head. A storage solution (pure water, an organic solvent, and the above mixed liquid) is injected into the head to prevent drying. As part of the delivery inspection including the electrical check and functional check process of the head, this storage solution can be used to detect defective discharge ports due to microfabrication and clogging due to impurities. Carry out at the stage of suction disposal.

  Step 9-2 is a step of defining a management serial number because it is a new head and registering it in a head management list (not shown). A management plate / sheet such as a barcode is attached to the head. .

  Step 9-3 is a step of registering, in the controller of the recovery processing apparatus, the ejection port determined to be defective by the electrical check and functional check that have already been performed. This abnormal discharge port is a defective discharge port regardless of whether the opening is clogged or not, due to non-connection or board failure, and can be determined to be a defective discharge port before recovery processing Say. That is, the corresponding discharge port refers to a discharge port that has not been used in advance and is not subjected to the recovery process for detecting clogging of the discharge port according to the present invention. Step 9-4 is a step of installing the head in the recovery processing apparatus.

  Step 9-5 is a step of starting the control device that operates the recovery device. Step 9-6 is a step of initializing the designated number N of the discharge port to 1. The discharge port designation number is a number assigned so that a total of N discharge ports from 1 to N can be uniquely determined on a one-to-one basis. Step 9-7 is a step of determining whether or not the discharge port number N is a defective discharge port registered in 9-3. If it is already registered in the list of defective outlets, the process proceeds to step 9-10 to increment the discharge port designation number N by one. If the number N discharge port is normal, in step 9-8, the recovery device controller makes the recovery rod come into contact with the target discharge port N whose designated number is N.

  Step 9-9 is a step of driving the suction pump and opening the suction valve, measuring the atmospheric pressure difference in the suction tub during suction, recording the pressure difference value in the memory form of the controller, This includes a series of defective discharge port detection process steps for determining whether or not the target discharge port of the designated number N is clogged until the liquid cannot be sucked.

  In the present invention, it is essential to measure the differential pressure at each discharge port, and there is no limitation on the location where the measurement means is provided, the memory for recording data, the recording means, the timing for determination processing, or the like. Step 9-10 is a step of incrementing the designated number N by 1. When the number of ejection ports to be inspected is exceeded in Step 9-11, the process proceeds to the step of stopping the recovery processing device in Step 9-12. If the total number of ejection ports has not been inspected, the process proceeds to step 9-7 for the ejection port of the designated number N + 1, and the routine from 9-7 to 9-11 is repeated.

  As described above, the flowchart shown in FIG. 9A measures the suction pressure when the storage solution (pure water, organic solvent, mixed solution) injected into the head is discarded, and the individual discharge ports are measured. Inspecting communication, it is permitted to supply ink of this use only to the ejection ports determined to be usable here. Prior to supplying the ink for use to the head, as a preparation, it is determined whether or not drawing can be correctly performed on a desired recording material using only the current normal ejection port, and the head is replaced with a separate head according to the possibility. The flow can be repeated, and if the head of the corresponding quality is sufficient, the process proceeds to an ink supply process for injecting a liquid to be actually drawn after cleaning. Here, since it does not relate to the defective ejection port detection method of the present invention, the description of the ink supply process is omitted.

  Next, the defective ejection port detection method in the step of FIG. 9B relates to a recovery process that is performed immediately before the head is actually mounted on the droplet ejection apparatus and drawn. Step 9-13 is the ink used for the head. Is supplied to the head. The flow from Step 9-14 to Step 9-23 is the same process as the flow from Step 9-3 to 9-12. In step 9-24, the head is mounted on the droplet discharge device and the head is prepared. Here, in steps 9-23, if it is determined that the corresponding head can be used, the operation is continued. If it is determined that it is unusable, if the non-or- in FIG. 9B can be improved again by gradually increasing the suction differential pressure of the recovery device to reduce the number of discharge ports of the defective discharge ports, the process proceeds to preparation before drawing with the same head. If not improved, the head is replaced with a separate head and the flow of FIG. 9B is repeated again.

  Regardless of the flow detection method in either flow, when the suction pressure from each individual discharge port according to the present invention is recovered, the corresponding discharge port is clogged when the differential pressure is swung up to a certain value or more. This is the same in that it is detected, and does not limit positioning in the apparatus, method, and process for sucking and recovering the head. Further, differential pressure data corresponding to the number of suction ports is recorded together with a serial number of the head and a discharge port designation number corresponding to a non-volatile memory installed in a part of the head, the recovery device and its controller.

  The recorded information on the defective discharge port may be displayed on a display (LCD, LED) (not shown) or warned by a warning sound of a warning device (buzzer) (not shown). The notification of detection of a defective discharge port may be exercised at the time of detection of a defective discharge port or may be exercised after the processing has been completed for all the discharge ports. Further, the present invention is not limited to the case where the suction recovery process of the recovery device is interrupted when a defective ejection port is detected, and the subsequent process is discarded or temporarily suspended. When the number of liquids used in the droplet ejection device is limited and the required number of ejection ports of the head is smaller than the total number of ejection ports, do not use the ejection ports determined as defective ejection ports when supplying ink. Ink allocation can also be controlled. Since the atmospheric pressure difference value at the time of suction recovery depends on the performance of the suction pump of the recovery device used, the diameter and shape of the ejection port of the suction head, the viscosity of the ink, etc. The reference value (threshold value) to be determined can be changed.

  In the present invention, since it is possible to find a defective ejection port before drawing in the droplet ejection apparatus, the liquid to be used and the recording medium are not wasted for inspection, and further, manufacturing is possible. This is effective in that the process time can be shortened.

It is a top view of the suction device part in Example 1 of the present invention. It is the KK sectional view taken on the line of FIG. It is a right view of the suction device part in Example 1 of the present invention. It is the LL sectional view taken on the line of FIG. It is a top view of a head. It is the MM sectional view taken on the line of FIG. It is detail drawing of the droplet discharge flow path without the clogging of the suction device part in Example 1 of this invention. FIG. 3 is a detailed view of a clogged droplet discharge passage in a suction device section according to Embodiment 1 of the present invention. It is a perspective view of the discharge device in Example 1 of the present invention. It is a flowchart of the process at the time of delivery of the head for the purpose of the detection of the defective discharge port in Example 1 of this invention. It is a flowchart of the pre-drawing preparatory process of the head aiming at the detection of the defective ejection opening in Example 1 of this invention.

Explanation of symbols

50 Pressure sensor 51 Base plate 52 Side plate 53 Head plate 54 Head 55 Liquid supply port 56 X stage 57 Z stage 58 Recovery rod stand 59 Recovery rod plate 60 Recovery rod 61 Recovery rod pipe 62 Recovery rod joint 63 Recovery rod spring 64 Recovery rod washer 65 Tube 66 X stage movable part 67 Z stage movable part 68 Discharge port 69 Suction pump 70 Atmospheric port 71 Waste liquid tube 72 Waste liquid tank 73 Y axis stage 74 X axis stage 75 Chuck 76 Atmospheric tube 77 Guide rail 78 Atmospheric valve 79 Surface plate 80, 81 Bridge 82, 83 Post 84 Recorded member 85 Stay 86 Head mount 87 Rail

Claims (20)

With respect to a head having a plurality of discharge ports, each of the openings of the discharge ports has suction means having suction ports that can approach other different discharge ports in a non-contact manner. The body's recovery saddle can apply its suction port wider than the opening of the discharge port, measuring means for measuring the pressure inside the recovery bag, and the differential pressure between the measured value and the atmospheric pressure during suction A droplet having a determining means for determining that the flow path to the opening is clogged and a notifying means for notifying the clogging of the corresponding discharge port when the liquid is swung above a certain threshold value A method for detecting defective discharge ports of a discharge device.
  The plurality of discharge ports are configured to discharge a part or all of liquids having liquid compositions different from each other, individually sucked in order from the discharge ports, and measuring the pressure difference, Determining means that determines which discharge type is not discharged due to clogging, display means that displays the determination result, and another alternative discharge port that supplements the corresponding liquid type by the determination result of defective discharge port 2. A method for detecting a defective ejection port of a liquid droplet ejection apparatus according to claim 1, further comprising instruction means for instructing whether to use or to switch to another head.   Since the sensor having the pressure measuring means is installed in the recovery saddle part and the difference between the measured value and the atmospheric pressure is within a certain threshold value, the discharge port is filled with liquid from a separate liquid supply part. 3. The method of detecting a defective ejection port of a droplet ejection apparatus according to claim 1, wherein the ejection is detected.   Since the sensor having the pressure measuring means is installed inside the discharge port and the difference between the measured value and the atmospheric pressure is within a certain threshold value, the discharge port is filled with liquid from a separate liquid supply unit. 3. The method of detecting a defective ejection port of a droplet ejection apparatus according to claim 1, wherein the ejection is detected.   The emergency stop means for stopping the suction means when the difference between the measured value by the atmospheric pressure measurement means and the atmospheric pressure exceeds a certain threshold, and the corresponding discharge port is not filled with liquid from a separate liquid supply unit 5. The droplet according to claim 1, further comprising: the display unit that displays that the clogged state is present, and the suction resuming unit that performs suction of another adjacent discharge port. A method for detecting defective discharge ports of a discharge device.   The pressure sensor as the atmospheric pressure measuring means has a regulator connected to the suction pump so that the pressure value can be raised stepwise in conjunction with the suction pump, and the emergency stop means is the regulator or an electromagnetic attached thereto. It implements by closing a valve, The threshold value of the pressure can be freely set and changed according to the shape and size of the flow path to the discharge port, and the fluid physical properties of the liquid. A method for detecting a defective ejection port of the droplet ejection apparatus according to claim 1.   The method for detecting a defective ejection port of a droplet ejection apparatus according to claim 1, wherein each of the pressure threshold values corresponding to a plurality of ejection ports can be individually set.   The set value corresponding to each discharge port is managed for a head having a different specification by a recording unit that records each of the pressure threshold values corresponding to the plurality of discharge ports in a nonvolatile memory. Item 8. A method for detecting a defective ejection port of a droplet ejection apparatus according to any one of Items 1 to 7. With respect to a head having a plurality of discharge ports, each of the openings of the discharge ports has suction means having suction ports that can approach other different discharge ports in a non-contact manner. The body's recovery saddle can apply its suction port wider than the opening of the discharge port, measuring means for measuring the pressure inside the recovery bag, and the differential pressure between the measured value and the atmospheric pressure during suction A droplet having a determining means for determining that the flow path to the opening is clogged and a notifying means for notifying the clogging of the corresponding discharge port when the liquid is swung above a certain threshold value Detection mechanism for defective discharge ports of discharge devices.
  The plurality of discharge ports are configured to discharge a part or all of liquids having liquid compositions different from each other, individually sucked in order from the discharge ports, and measuring the pressure difference, Determining means that determines which discharge type is not discharged due to clogging, display means that displays the determination result, and another alternative discharge port that supplements the corresponding liquid type by the determination result of defective discharge port 10. A defective ejection port detection mechanism for a droplet ejection apparatus according to claim 9, further comprising instruction means for instructing whether to use or to switch to another head.   Since the sensor having the atmospheric pressure measuring means is installed in the recovery saddle, and the difference between the measured value and the atmospheric pressure is within a certain threshold, the discharge port is filled with liquid from a separate liquid supply unit 11. The mechanism for detecting a defective discharge port of a droplet discharge device according to claim 9 or 10, wherein:   Since the sensor having the pressure measuring means is installed inside the discharge port, and the difference between the measured value and the atmospheric pressure is within a certain threshold, the discharge port is filled with liquid from a separate liquid supply unit. 11. The mechanism for detecting a defective discharge port of a droplet discharge device according to claim 9 or 10, wherein:   When the difference between the measured value by the atmospheric pressure measurement means and the atmospheric pressure exceeds a certain threshold, the emergency stop means for stopping the suction means and the corresponding discharge port are filled with liquid from a separate liquid supply unit 13. The liquid according to claim 9, further comprising: the display unit that displays that there is no clogging, and the suction resuming unit that performs suction of another adjacent discharge port. A mechanism for detecting defective outlets of a droplet discharge device.   The pressure sensor as the atmospheric pressure measuring means has a regulator connected to the suction pump so that the pressure value can be raised stepwise in conjunction with the suction pump, and the emergency stop means is the regulator or an electromagnetic attached thereto. It implements by closing a valve, The threshold value of the pressure can be freely set and changed according to the shape and size of the flow path to the discharge port, and the fluid physical properties of the liquid. A defective discharge port detection mechanism of the liquid droplet discharge device according to 1.   15. The defective discharge port detection mechanism of a droplet discharge device according to claim 9, wherein each of the pressure thresholds corresponding to a plurality of discharge ports can be individually set.   The set value corresponding to each discharge port is managed for a head having a different specification by a recording unit that records each of the pressure threshold values corresponding to the plurality of discharge ports in a nonvolatile memory. Item 16. A defective ejection port detection mechanism of a droplet ejection device according to any one of Items 9 to 15.   17. The mechanism for detecting a defective discharge port of a droplet discharge device according to claim 9, wherein the head includes an electrothermal converter for generating thermal energy for liquid discharge. .   18. The liquid droplet ejection apparatus according to claim 17, wherein the head ejects liquid from an ejection port provided in the head by utilizing film boiling caused by thermal energy applied by the electrothermal transducer. Detection mechanism for defective discharge ports.   The defective ejection port detection mechanism of a droplet ejection apparatus according to claim 9, wherein the head includes a piezoelectric element for ejecting liquid.   20. The defective ejection of a droplet ejection apparatus according to claim 19, wherein the head ejects a liquid from an ejection port provided in the head using a pressure generated by a shape change of a piezoelectric element for ejecting liquid. Exit detection mechanism.

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