JP2019072929A - Liquid jet device and maintenance method of the liquid jet device - Google Patents

Abstract

To provide a liquid jet device and a maintenance method of the liquid jet deice which can adequately carry out maintenance of a jet head having a nozzle while suppressing consumption of a liquid.SOLUTION: A liquid jet device includes a jet head 12 having a plurality of nozzles 19 which can jet a liquid, a liquid supply mechanism which can pressurize and supply the liquid to the jet head, a wiping member 80 which can contact with a gas-liquid interface (a liquid level) of the liquid swelling from the nozzle, and a control part. The control part selects a nozzle which requires maintenance by discharge of the liquid, swells the liquid level 97 by pressurizing the liquid in the nozzle including the selected nozzle 19a which is selected, and contacts the wiping member with the liquid level of the selected nozzle out of the nozzles of which liquid levels are swelled to discharge the liquid.SELECTED DRAWING: Figure 4D

Description

  The present invention relates to a liquid ejecting apparatus and a method of maintaining the liquid ejecting apparatus.

  Conventionally, for example, as described in Patent Document 1, an ink jet printer (liquid ejecting apparatus) that wipes (pressurizes and wipes) a region where a nozzle is formed in a pressurized state at the time of cleaning (maintenance) It has been known.

Unexamined-Japanese-Patent No. 2004-291618

  However, in the liquid ejecting apparatus described in Patent Document 1, when the pressure wiping is performed, there is a problem that the ink flows out from the nozzle along with the wiping, and the ink that can be used for printing is wastefully consumed.

  An object of the present invention is to solve the problem of wasteful consumption of liquid, and a liquid ejecting apparatus and liquid which can appropriately perform maintenance of a jet head having a nozzle while suppressing consumption of liquid. It is an object of the present invention to provide a method of maintenance of an injection device.

  Application Example 1 According to this application example, a liquid jet apparatus includes: a jet head having a plurality of nozzles capable of jetting a liquid; a liquid supply mechanism capable of pressurizing and supplying the liquid toward the jet head; and the nozzle A contact member capable of coming into contact with the liquid level (gas-liquid interface) of the liquid bulging from the surface, and a control unit, the control unit selecting and selecting a nozzle requiring maintenance by discharging the liquid The liquid surface is expanded by pressurizing the liquid in the nozzle including the selection nozzle, and the contact member is brought into contact with the liquid surface of the selection nozzle among the nozzles which has the liquid surface expanded. And discharging the liquid.

  According to this application example, among the nozzles whose liquid level has been bulging, a nozzle requiring maintenance is selected, and the liquid is discharged by bringing only the selected nozzle selected into contact with the contact member. That is, the outflow of the liquid from the nozzle requiring no maintenance is suppressed. Therefore, maintenance of the jet head can be appropriately performed while suppressing wasteful consumption of the liquid.

  Application Example 2 In the liquid ejecting apparatus according to the application example described above, it is preferable that the liquid level be expanded after the contact member is disposed at the position corresponding to the selection nozzle by the control unit.

  According to this application example, the contact member is disposed at a position corresponding to the nozzle requiring maintenance by discharging the liquid, and then the liquid surface is expanded. Therefore, it is possible to reduce the contact of the contact member with the liquid surface bulging from the nozzle which does not require maintenance due to the discharge of the liquid.

  Application Example 3 The liquid ejecting apparatus according to the application example may further include a wiping member capable of wiping the nozzle of the ejection head, and the controller may control the gas-liquid interface (liquid surface) of the selection nozzle. Preferably, an area including a nozzle other than the selection nozzle is wiped by the wiping member before contacting the contact member.

  The nozzle requiring maintenance by discharging the liquid discharges the foreign matter (paper dust, thickened liquid (for example, ink), liquid of other colors (for example, ink, etc.) and the like) by the contact of the contact member. However, since foreign matter present near the nozzle requiring no maintenance remains, it may be taken in by the bulging liquid and flow into the nozzle at the time of pressure release, which may cause ejection failure. . In that respect, according to this application example, since the liquid surface is swollen after the foreign matter present on the nozzle formation surface is wiped out, the foreign matter can be prevented from being taken into the nozzle.

  Application Example 4 In the liquid ejecting apparatus according to the application example described above, after the contact member is selected and brought into contact with the liquid surface of the selection nozzle by the control unit, the pressurization of the liquid is released. Preferably, the nozzle is wiped by the wiping member.

  Since the meniscus of the nozzle is likely to be destroyed after the pressure is released from the liquid, the liquid may not be ejected properly from the nozzle on which maintenance has been performed. Therefore, according to this application example, the meniscus of the nozzle can be reliably formed by wiping, and the normal ejection state can be achieved.

  Application Example 5 In the liquid ejecting apparatus described in the application example, it is preferable to use the wiping member as the contact member.

  According to this application example, by using the wiping member as the contact member, it is not necessary to separately provide the contact member. This can simplify the device.

  Application Example 6 of a maintenance method of a liquid ejecting apparatus according to this application example includes: an ejection head having a plurality of nozzles capable of ejecting a liquid; a liquid supply mechanism capable of pressurizing and supplying the liquid toward the ejection head And a control unit capable of contacting the liquid level (gas-liquid interface) of the liquid expanded from the nozzle, and the control unit selects a nozzle requiring maintenance by discharging the liquid. The liquid surface is expanded by pressurizing the liquid in the nozzle including the selected selection nozzle, and the liquid surface is made contact with the liquid surface of the selection nozzle among the nozzles which are expanded. A member is brought into contact to discharge the liquid.

  According to this application example, a nozzle requiring maintenance is selected from the bulged nozzles, and only the selected nozzle selected is brought into contact with the contact member to discharge the liquid. That is, the outflow of the liquid from the nozzle requiring no maintenance is suppressed. Therefore, maintenance of the jet head can be appropriately performed while suppressing wasteful consumption of the liquid.

FIG. 2 is a schematic view of the liquid ejecting apparatus according to the first embodiment. The schematic diagram of several pressure regulation apparatuses and a pressure regulation part. FIG. 2 is a schematic view of the liquid injection device in a state where the on-off valve is opened. Explanatory drawing which shows the maintenance method of a liquid injection apparatus. Explanatory drawing which shows the maintenance method of a liquid injection apparatus. Explanatory drawing which shows the maintenance method of a liquid injection apparatus. Explanatory drawing which shows the maintenance method of a liquid injection apparatus. Explanatory drawing which shows the maintenance method of a liquid injection apparatus. Explanatory drawing which shows the maintenance method of a liquid injection apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following drawings, the scale of each layer or each member is shown differently from the actual size in order to make each layer or each member recognizable.

(Embodiment 1)
FIG. 1 is a schematic view of a liquid ejecting apparatus 11 according to the first embodiment. The liquid ejecting apparatus 11 according to the present embodiment includes an ejection head 12 for ejecting liquid (ink) and a liquid supply mechanism for supplying liquid (ink) to the ejection head 12 from a liquid supply source 13 which is a supply source of liquid (ink). 14, a wiping unit 91 including a wiping member 80 as a contact member, and a control unit 78 that comprehensively controls driving of each mechanism.

  The injection head 12 includes an injection unit filter 16 for capturing air bubbles and foreign substances in the liquid, a common liquid chamber 17 for storing the liquid that has passed through the injection unit filter 16, a plurality of nozzles 19 formed on the nozzle forming surface 18 and And a plurality of pressure chambers 20 communicating the common liquid chamber 17. A part of the wall surface of the pressure chamber 20 is formed by the diaphragm 21, and the common liquid chamber 17 and the pressure chamber 20 communicate with each other through the communication hole 22. Furthermore, an actuator 24 accommodated in the accommodation chamber 23 is disposed at a position opposite to the portion facing the pressure chamber 20 in the diaphragm 21 and at a position different from the common liquid chamber 17.

  The actuator 24 is, for example, a piezoelectric element that contracts when a drive voltage is applied. After the diaphragm 21 is deformed with the contraction of the actuator 24, when the application of the drive voltage is released, the liquid in the pressure chamber 20 whose volume has changed is ejected from the nozzle 19 as a droplet. That is, the ejection head 12 drives the actuator 24 to eject the liquid from the nozzle 19.

  The liquid supply source 13 is, for example, a storage container capable of containing a liquid. Note that at least one set (four sets in the present embodiment) of the liquid supply source 13 and the liquid supply mechanism 14 is provided for each type of liquid ejected from the ejection head 12.

  The liquid supply path 27 is provided with a pressurizing mechanism 31 for pressurizing and supplying the liquid from the liquid supply source 13 to the ejection head 12. The pressure mechanism 31 reciprocates the flexible member 37 having a flexibility to apply pressure to the liquid, and one direction provided upstream and downstream of the volume pump 38 in the liquid supply path 27. And valves 39 and 40 are provided.

  The volumetric pump 38 has a pump chamber 41 and a negative pressure chamber 42 separated by a flexible member 37. Furthermore, the volumetric pump 38 includes a pressure reducing portion 43 for reducing the pressure in the negative pressure chamber 42, and a biasing member 44 provided in the negative pressure chamber 42 to bias the flexible member 37 toward the pump chamber 41. And have. In addition, the one-way valves 39 and 40 allow the flow of the liquid in the liquid supply direction A in the liquid supply path 27 and restrict the flow of the liquid in the reverse direction. That is, the pressurizing mechanism 31 can pressurize the liquid supplied to the pressure adjusting mechanism 35 by the urging member 44 urging the liquid in the pump chamber 41 via the flexible member 37. Therefore, the pressing force at which the pressing mechanism 31 presses the liquid is set by the biasing force of the biasing member 44.

  As shown in FIG. 2, the wiping unit 91 includes a wiping member 80, a vertical guide shaft 95 for guiding the movement of the wiping member 80 in the height direction with respect to the ejection head 12, and a horizontal for guiding the movement in the horizontal direction. The guide shaft 93, the wiping member holding portion 96 holding the wiping member 80, the guide shaft holding portion 92 moving along the horizontal guide shaft 93 and holding the vertical guide shaft 95, and the wiping member 80 the vertical guide shaft 95 And a drive source 94 (for example, a motor or the like) for moving along the horizontal guide shaft 93.

  The wiping member 80 is, for example, a plate-like member made of an elastically deformable resin or the like. By driving the drive source 94, the wiping member 80 can be moved along the vertical guide shaft 95 and the horizontal guide shaft 93. Thus, the wiping member 80 can be moved to a position corresponding to an arbitrary nozzle 19, or the nozzle forming surface 18 can be wiped by the wiping member 80.

Next, the pressure adjusting device 47 will be described.
As shown in FIG. 1, the pressure adjusting device 47 includes a pressure adjusting mechanism 35 which constitutes a part of the liquid supply path 27 and a pressing mechanism 48 which presses the pressure adjusting mechanism 35.

  The pressure adjustment mechanism 35 includes a main body 52 formed of a liquid inflow portion 50 into which the liquid flows from the liquid supply source 13 via the liquid supply path 27 and a liquid storage portion 51 capable of containing the liquid. The liquid supply path 27 and the liquid inflow portion 50 are separated by the wall portion 53, and are in communication with each other through the through hole 54 formed in the wall portion 53. Further, the through hole 54 is closed by the filter member 55. That is, the liquid passes through the filter member 55 and flows into the liquid inflow portion 50.

  Further, in the liquid storage unit 51, a part of the wall surface is configured by the diaphragm unit 56. The diaphragm portion 56 receives the pressure of the liquid in the liquid storage portion 51 on the first surface 56 a which is the inner surface of the liquid storage portion 51 while the atmospheric pressure on the second surface 56 b which is the outer surface of the liquid storage portion 51. Receive Therefore, the diaphragm unit 56 is displaced in accordance with the pressure in the liquid storage unit 51. Then, in the liquid storage unit 51, the displacement of the diaphragm unit 56 changes the internal volume. Further, the liquid inflow portion 50 and the liquid storage portion 51 are in communication by the communication path 57.

  Furthermore, the pressure adjustment mechanism 35 has a valve closed state in which the liquid inflow portion 50 and the liquid storage portion 51 are not in communication in the communication path 57 as shown in FIG. 1 and the liquid inflow portion 50 as shown in FIG. And an open valve state in which the liquid storage portion 51 is communicated with each other. The on-off valve 59 has a valve portion 60 capable of blocking the communication path 57, and a pressure receiving portion 61 receiving pressure from the diaphragm portion 56, and is moved by the pressure receiving portion 61 being pressed by the diaphragm portion 56. That is, the pressure receiving portion 61 also functions as a movable member which can move in a state of being in contact with the diaphragm portion 56 which is displaced in the direction of reducing the volume of the liquid storage portion 51.

  Further, the upstream biasing member 62 is provided in the liquid inflow portion 50, and the downstream biasing member 63 is provided in the liquid storage portion 51. The upstream biasing member 62 and the downstream biasing member 63 bias the on-off valve 59 in the closing direction.

  In the on-off valve 59, the pressure applied to the first surface 56a is lower than the pressure applied to the second surface 56b, and the difference between the pressure applied to the first surface 56a and the pressure applied to the second surface 56b is a predetermined value When the pressure is higher than 1 kPa, for example, the valve-closing state is changed to the valve-opening state. Note that with the predetermined value, the biasing force of the upstream biasing member 62, the biasing force of the downstream biasing member 63, and the diaphragm portion 56 are displaced. Force required to cause pressure, a pressing force (seal load) required to shut off the communication path 57 by the valve portion 60, the pressure in the liquid inflow portion 50 acting on the surface of the valve portion 60, and the pressure in the liquid storage portion 51. It is a value determined according to the pressure. That is, the biasing force of the upstream biasing member 62 and the downstream biasing member 63 is a negative pressure state in which the pressure in the liquid storage portion 51 can form the meniscus 64 on the liquid surface (gas-liquid interface) at the nozzle 19 (For example, when the pressure applied to the second surface 56 b is atmospheric pressure, it is set to be −1 kPa).

  The gas-liquid interface is a boundary where liquid and gas are in contact. The meniscus 64 is a curved liquid surface formed when the liquid comes in contact with the nozzle 19, and the nozzle 19 is preferably formed with a concave meniscus 64 suitable for the ejection of the liquid.

  Further, the pressing mechanism 48 includes an expansion and contraction portion 67 forming a pressure adjustment chamber 66 on the second surface 56 b side of the diaphragm portion 56, a pressing member 68 for pressing the expansion and contraction portion 67, and the pressure adjustment chamber 66. And a pressure adjusting unit 69 capable of adjusting the pressure.

  The expansion and contraction portion 67 is formed in a balloon shape, for example, of rubber, resin, or the like, and can expand and contract as the pressure adjusting portion 69 adjusts the pressure of the pressure adjusting chamber 66. The pressing member 68 has a cylindrical shape with a bottom, and the expansion / contraction portion 67 is inserted into the insertion hole 70 formed in the bottom.

  Then, in the pressing member 68, the end on the opening 71 side of the inner side surface is chamfered and rounded. Further, the pressing member 68 is attached to the pressure adjusting mechanism 35 so that the opening 71 is closed by the pressure adjusting mechanism 35, thereby forming an air chamber 72 covering the second surface 56b of the diaphragm 56. The pressure in the air chamber 72 is atmospheric pressure, and the atmospheric pressure acts on the second surface 56 b of the diaphragm 56.

  That is, the pressure adjusting unit 69 expands the expansion and contraction unit 67 by adjusting the pressure in the pressure adjusting chamber 66 to a pressure higher than the atmospheric pressure that is the pressure of the air chamber 72. The pressure adjustment unit 69 expands the expansion and contraction unit 67 to press the diaphragm unit 56 in the direction in which the volume of the liquid storage unit 51 decreases. Further, at this time, the pressing mechanism 48 presses a region in the diaphragm portion 56 where the pressure receiving portion 61 contacts. The area of the region of the diaphragm 56 in contact with the pressure receiving portion 61 is larger than the cross-sectional area of the communication passage 57.

  As shown in FIG. 2, the pressure adjusting unit 69 includes a pressure pump 74 for pressurizing fluid, a connection path 75 for connecting the pressure pump 74 and the expansion / contraction portion 67, and a detection unit 76 provided in the connection path 75. And a fluid pressure adjusting unit 77. The downstream side of the connection path 75 is branched, and is connected to the expansion and contraction portion 67 of the pressure adjusting device 47 provided with a plurality (four in the present embodiment).

  That is, the fluid pressurized by the pressurizing pump 74 is supplied to the respective expansion and contraction portions 67 via the connection path 75. Then, the detection unit 76 detects the pressure of the fluid supplied in the connection path 75, and the fluid pressure adjustment unit 77 opens the fluid when the pressure of the supplied fluid becomes higher than a predetermined pressure. Adjust the fluid to a predetermined pressure by

  In addition, the liquid ejecting apparatus 11 includes a liquid receiving portion 81 that receives the liquid discharged from the nozzle 19 with flushing or the like. The flushing is an operation of driving the actuator 24 to forcibly eject the liquid from the nozzle 19 regardless of the printing.

Next, the operation of the pressure adjusting device 47 for adjusting the pressure of the liquid supplied to the ejection head 12 will be described.
As shown in FIG. 1, when the jet head 12 jets the liquid, the liquid stored in the liquid storage unit 51 is supplied to the jet head 12 through the liquid supply path 27. Then, the pressure in the liquid storage unit 51 is reduced.

  The diaphragm portion 56 is bent and deformed in the direction of reducing the volume of the liquid storage portion 51 as the differential pressure between the pressure applied to the first surface 56a and the pressure applied to the second surface 56b increases. Then, when the pressure receiving portion 61 is pressed and moved with the deformation of the diaphragm portion 56, the on-off valve 59 is opened.

  In addition, the liquid in the liquid inflow portion 50 is pressurized by the pressurizing mechanism 31. Therefore, when the on-off valve 59 is opened, the liquid is supplied from the liquid inflow unit 50 to the liquid storage unit 51, and the pressure in the liquid storage unit 51 is increased. Then, the diaphragm unit 56 is deformed to increase the volume of the liquid storage unit 51. Then, when the difference between the pressure applied to the first surface 56a and the pressure applied to the second surface 56b becomes smaller than a predetermined value, the on-off valve 59 changes from the open state to the closed state to regulate the flow of the liquid. .

  In this manner, the pressure adjusting mechanism 35 adjusts the pressure in the jet head 12 which is the back pressure of the nozzle 19 by displacing the diaphragm 56 to adjust the pressure of the liquid supplied to the jet head 12.

Next, a cleaning (maintenance) method of the liquid ejecting apparatus 11 will be described.
4A to 4F are explanatory diagrams of the maintenance method of the liquid ejecting apparatus 11. FIG. In the maintenance method of the liquid ejecting apparatus 11 according to the present embodiment, the control unit 78 selects the nozzle 19 requiring maintenance from the nozzles 19 which bulges the liquid level 97 by pressurizing the liquid, and the selected selection is made. The wiping member 80 as a contact member is brought into contact with the liquid surface 97 of the nozzle 19a to discharge the liquid.

  FIG. 4A shows an initial state, and shows the positional relationship between the ejection head 12 and the wiping member 80 before maintenance. Specifically, the wiping member 80 is positioned at one end of the jet head 12 and in a position not in contact with the jet head 12.

  Here, the nozzle 19 requiring maintenance by discharging the liquid is selected. As a method of selecting the nozzles 19 requiring maintenance, the ejection state confirmation (nozzle check) of the nozzles 19 for all the nozzles 19 is executed. Specifically, the actuator 24 is driven. As the operation of the nozzle check, for example, the diaphragm 21 is vibrated to such an extent that the liquid is not ejected, and the waveform of the residual vibration is acquired.

  Next, from the waveform of the residual vibration of the diaphragm 21 obtained by the nozzle check, it is determined whether the nozzle 19 needs maintenance. Then, when there is a nozzle 19 (defective nozzle) requiring maintenance, the defective nozzle is specified as the selected nozzle 19a.

  Next, as shown in FIG. 4B, the wiping unit 91 is driven to wipe the area including the nozzles 19 other than the selection nozzle 19a with the wiping member 80. Thereby, the foreign matter present on the nozzle forming surface 18 is removed.

  Next, as shown in FIG. 4C, the wiping member 80 is disposed at a position corresponding to the selection nozzle 19a. The distance between the jet head 12 and the wiping member 80 is preferably set so that the liquid surface 97 bulging from the selection nozzle 19 a and the wiping member 80 come in contact with each other.

  Then, as shown in FIG. 4D, after the wiping member 80 is disposed at the position corresponding to the selection nozzle 19a, the liquid level 97 is expanded from the nozzle 19 by the pressurization of the liquid. In this case, a range in which the meniscus 64 of the nozzle 19 which does not require maintenance is not broken (for example, a range which is higher than the atmospheric pressure by about 1 kPa) is preferable as a necessary pressing force. The bulging of the liquid means that when the liquid is pressurized, the liquid surface 97 comes out of the nozzle 19 in a convex shape in the direction of gravity. At this time, the wiping member 80 and the liquid surface 97 contact only the selection nozzle 19a. Thereby, the liquid in contact with the wiping member 80 is discharged along the wiping member 80.

  Next, as shown in FIG. 4E, after the discharge of the liquid bulging from the selection nozzle 19a is finished, the pressurization of the liquid is released.

  Next, as shown in FIG. 4F, the nozzle 19 including the selection nozzle 19a is wiped by the wiping member 80. Thereby, a meniscus 64 is formed on the nozzle 19.

  When the liquid ejecting apparatus 11 has at least two types of liquids, after the wiping by the wiping member 80, the actuator 24 may be driven to perform flushing as needed. This can prevent color mixing.

According to the first embodiment, the following effects can be obtained.
(1) The liquid is discharged by bringing only the selection nozzle 19a into contact with the wiping member 80. That is, the outflow of the liquid from the nozzle 19 which does not require maintenance is suppressed. Therefore, maintenance of the jet head 12 can be appropriately performed while suppressing wasteful consumption of the liquid.

  (2) After the wiping member 80 is disposed at a position corresponding to the selection nozzle 19a, the liquid level 97 is expanded from the nozzle 19. This can reduce the contact of the wiping member 80 with the liquid surface 97 expanded from the other nozzles 19.

  (3) The selection nozzle 19a can discharge the foreign substance (paper dust, thickened ink, ink of other colors, etc.) by the contact of the wiping member 80 together with the liquid surface 97 bulging out, but it is near the other nozzle 19 The foreign matter present in the air is retained in the liquid surface 97 which has been expanded, and flows into the nozzle 19 at the time of releasing the pressure, which may cause an ejection failure. In that respect, the foreign matter present near the nozzle 19 is wiped by the wiping member 80 and then the liquid level 97 is bulged from the nozzle 19, so that the foreign matter can be prevented from being taken in.

  (4) Since the meniscus 64 of the nozzle 19 is easily broken after releasing the pressure of the liquid, the liquid may not be normally ejected from the nozzle 19 which has been maintained. Therefore, the meniscus 64 of the nozzle 19 can be adjusted by wiping to make a normal ejection state.

  The present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification is described below.

  (Modification 1) In the above embodiment, after the wiping member 80 is disposed at the position corresponding to the selection nozzle 19a, the liquid level 97 is expanded, but the present invention is not limited to this. For example, after the liquid surface 97 is expanded, the wiping member 80 may be disposed at a position corresponding to the selection nozzle 19a. Thereby, the same effect as that of the above embodiment can be obtained.

  (Modification 2) In the above embodiment, when the wiping member 80 is disposed at a position corresponding to the selection nozzle 19a, the nozzle forming surface 18 and the wiping member 80 may be in contact with each other. In the case of contact, the wiping member 80 is disposed at a position slightly away from the selection nozzle 19a. As a result, it is not necessary to specify the height position of the wiping member 80, so the vertical guide shaft 95 is unnecessary, and the structure can be simplified.

  (Modification 3) In the above embodiment, the wiping member 80 has been described as an example of the contact member, but the other contact member may be the edge (lip surface) of the liquid receiving portion 81, or the contact member May be provided separately. Since this eliminates the need to specify the height position of the wiping member 80, the vertical guide shaft 95 becomes unnecessary, so the structure can be simplified.

  (Modification 4) The wiping member 80 is not limited to a plate-like member made of an elastically deformable resin or the like, and may be an absorbing member such as cloth capable of absorbing a liquid. Thereby, since the contact part of the nozzle 19 can be changed for every wiping, it can reduce that a foreign material is taken in.

  (Modification 5) The actuator 24 is not limited to one including a piezoelectric element, but includes one having an electrostatic drive element, and one including a heating resistance element that emits heat to evaporate liquid when a drive voltage is applied. It may be Thereby, the same effect as that of the above embodiment can be obtained.

  (Modification 6) The liquid supply source 13 may be a cartridge that supplies liquid by replacing the storage container, or may be a storage tank fixed to the mounting unit 26. When the liquid supply source 13 is a cartridge, the mounting unit 26 detachably holds the liquid supply source 13. Thereby, the same effect as that of the above embodiment can be obtained.

  (Modification 7) The user may select the selection nozzle 19a as a selection method. As a result, maintenance can be performed at an arbitrary timing, and usability can be improved.

  (Modification 8) Before bringing the liquid surface 97 expanded from the selection nozzle 19a into contact with the wiping member 80, the region including the selection nozzle 19a and the region including the nozzle 19 other than the selection nozzle 19a are wiped by the wiping member 80 May be Thereby, the same effect as that of the above embodiment can be obtained.

  (Modification 9) In the above embodiment, the wiping direction of the region including the nozzles 19 by the wiping member 80 has been described as the direction in which the plurality of nozzles 19 are arranged, but the wiping direction by the wiping member 80 is the direction in which the plurality of nozzles 19 are arranged It may be a direction that intersects with Thereby, the same effect as that of the above embodiment can be obtained. Further, by making the width in the direction intersecting the wiping direction of the wiping member 80 wider than the length of the nozzle row formed by the plurality of nozzles 19, the wiping member 80 can be used as the plurality of selection nozzles 19 a even when there are a plurality of selection nozzles 19 a. The liquid can be drained by simultaneously contacting the

(Modification 10) In the above embodiment, the liquid ejecting apparatus 11 may eject or discharge a liquid other than ink. In addition, as a state of the liquid discharged as a very small amount of droplet from the liquid ejecting apparatus 11, there are also granular, teardrop, and threadlike tails. Further, the liquid referred to here may be any material that can be ejected from the liquid ejecting apparatus 11. For example, any substance having a liquid phase state may be used, and liquids such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts) It shall be in the form of a solid. In addition to the liquid in one state of the substance, it also includes particles in which functional material particles made of solid matter such as pigment and metal particles are dissolved, dispersed or mixed in a solvent.
Thereby, also in the liquid ejecting apparatus 11 other than the ink jet printer, the same effect as that of the above embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 11 ... Liquid injection apparatus, 12 ... Injection head, 13 ... Liquid supply source, 14 ... Liquid supply mechanism, 16 ... Injection part filter, 17 ... Common liquid chamber, 18 ... Nozzle formation surface, 19 ... Nozzle, 19a ... Selection nozzle, 20: pressure chamber, 21: diaphragm, 22: communication hole, 23: storage chamber, 24: actuator, 26: mounting portion, 27: liquid supply path, 31: pressurizing mechanism, 35: pressure adjusting mechanism, 37: acceptable Flexible member, 38: Volume pump, 39: One-way valve, 40: One-way valve, 41: Pump chamber, 42: Negative pressure chamber, 43: Decompression part, 44: Biasing member, 47: Pressure adjusting device, 48 ... Pressing mechanism 50: liquid inflow portion 51: liquid storage portion 52: main body portion 53: wall portion 54: through hole 55: filter member 56: diaphragm portion 56a first surface 56b Second surface, 57 ... communication path, 59 ... opening and closing , 60: valve portion, 61: pressure receiving portion, 62: upstream biasing member, 63: downstream biasing member, 64: meniscus, 66: pressure adjusting chamber, 67: expansion and contraction portion, 68: pressing member, 69, ... Pressure adjustment part 70 insertion hole 71 opening 72 air chamber 74 pressure pump 75 connection path 76 detection part 77 fluid pressure adjustment part 78 control part 80 wiping Members 81: liquid receiving portion 91: wiping unit 92: guide shaft holding portion 93: horizontal guide shaft 94: driving source 95: vertical guide shaft 96: wiping member holding portion 97: liquid surface

Claims (6)

An ejection head having a plurality of nozzles capable of ejecting a liquid;
A liquid supply mechanism capable of pressurizing and supplying the liquid toward the ejection head;
A contact member capable of contacting the liquid surface of the liquid expanded from the nozzle;
And a control unit,
The control unit selects a nozzle that requires maintenance by discharging the liquid, and pressurizes the liquid in the nozzle including the selected selection nozzle to cause the liquid level to swell and expand the liquid level. A liquid ejecting apparatus characterized in that the contact member is brought into contact with the liquid surface of the selection nozzle among the ejected nozzles to discharge the liquid. In the liquid ejecting apparatus according to claim 1,
The control unit, after arranging the contact member at a position corresponding to the selection nozzle, bulges the liquid surface. In the liquid ejecting apparatus according to claim 1 or 2,
A wiping member capable of wiping the nozzle of the jet head;
The control unit causes the wiping member to wipe an area including the nozzle other than the selection nozzle before bringing the contact member into contact with the liquid surface of the selection nozzle. In the liquid ejecting apparatus according to claim 3,
The control unit causes the contact member to be selected and in contact with the liquid surface of the selection nozzle, and then the nozzle is wiped by the wiping member in a state where the pressure of the liquid is released. Injection device. In the liquid ejecting apparatus according to claim 3 or 4,
A liquid ejecting apparatus using the wiping member as the contact member. An ejection head having a plurality of nozzles capable of ejecting a liquid;
A liquid supply mechanism capable of pressurizing and supplying the liquid toward the ejection head;
A contact member capable of contacting the liquid surface of the liquid expanded from the nozzle;
A maintenance method of a liquid ejecting apparatus comprising a control unit,
The control unit selects a nozzle that requires maintenance by discharging the liquid, and pressurizes the liquid in the nozzle including the selected selection nozzle to cause the liquid level to swell and expand the liquid level. A maintenance method of a liquid ejecting apparatus, wherein the contact member is brought into contact with the liquid surface of the selection nozzle among the ejected nozzles to discharge the liquid.