How to clean the ejection head

Abstract

To provide a method for cleaning a discharge head which can remove contaminants adhered to a non-flat part of the discharge head.SOLUTION: A discharge head 23 has a head body having a nozzle surface 26, and a first cover member and a second cover member 40. The nozzle surface 26 includes a first boundary with the first cover member, and a second boundary with the second cover member 40, and the first boundary and the second boundary extend in a first direction. A method for cleaning the discharge head 23 includes: a nozzle surface wiping step of relatively moving the discharge head 23 and a first cleaning part, and thereby wiping the first cover member, the nozzle surface 26 and the second cover member 40 with a first wiping member; and a second cover member cleaning step of relatively reciprocating the discharge head 23 and the second cleaning part in the first direction, and thereby cleaning the second cover member 40 with a second wiping member 61. The second cover member cleaning step includes a second boundary cleaning step of cleaning a region including the second boundary with the second wiping member 61.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present disclosure relates to a method for cleaning a dispensing head. [Background technology]

[0002] An inkjet printer, which is an example of a printing device, is equipped with a discharge head that discharges ink. As printing is performed, ink mist adheres to the discharge head and the head becomes dirty. If the discharge head is dirty, droplets may not be discharged in the correct direction, resulting in discharge defects. Patent Document 1 discloses an inkjet printer configured to clean the discharge head by pressing a roll-shaped cleaning sheet against it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-192728 Summary of the Invention [Problem to be solved by the invention]

[0004] Dirt adhering to the ejection head may not be removable simply by pressing a cleaning sheet against it, and dirt adhering to uneven parts of the ejection head is particularly difficult to remove. [Means for solving the problem]

[0005] In a method for cleaning an ejection head of a printing device according to one aspect of the present disclosure, the printing device includes: the ejection head configured to eject a liquid onto a medium that moves relatively to the ejection head; a first cleaning unit for cleaning the ejection head; and a second cleaning unit for cleaning the ejection head, wherein the ejection head is a head body having a nozzle surface from which a plurality of nozzles that eject the liquid open, the nozzle surface including a first edge and a second edge, the plurality of nozzles being positioned between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; and a second cover member attached to the head body so as to cover the second edge, wherein the nozzle surface has a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member. the first boundary and the second boundary extend in a first direction, the second cleaning unit has a second wiping member capable of absorbing the liquid and a second holding portion that holds the second wiping member, the first cleaning unit has a first wiping member made of a material that has lower absorbency for the liquid than the second wiping member, and a first holding portion that holds the first wiping member, and the cleaning method includes a nozzle surface wiping step in which the first wiping member wipes the first cover member, the nozzle surface, and the second cover member by moving the ejection head and the first cleaning unit relative to each other, and a second cover member cleaning step in which the second wiping member cleans the second cover member by moving the ejection head and the second cleaning unit back and forth relative to each other along the first direction, and the second cover member cleaning step includes a second boundary cleaning step in which the second wiping member cleans an area including the second boundary. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of a printing apparatus according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram of a discharge head provided in the printing device of FIG. [Figure 3] FIG. 3 is a bottom view of the ejection head of FIG. 2. [Figure 4]2 is a schematic diagram of a discharge head, a first cleaning unit, and a second cleaning unit provided in the printing apparatus of FIG. 1. FIG. [Figure 5] FIG. 5 is a perspective view of the second cleaning unit of FIG. 4. [Figure 6] 3 is a flowchart of a series of maintenance operations for the ejection head of FIG. 2. [Figure 7] 7A and 7B are schematic diagrams illustrating the operation involved in the preparation for cleaning shown in FIG. 6. [Figure 8] 7A and 7B are schematic diagrams illustrating the wiping shown in FIG. 6. [Figure 9] 7A and 7B are schematic diagrams illustrating operations accompanying preparation for wiper cleaning shown in FIG. 6. [Figure 10] FIG. 7 is a schematic diagram illustrating the wiper cleaning shown in FIG. 6. [Figure 11] 7 is a flowchart of cleaning the second cover member shown in FIG. 6. [Figure 12] 12 is a schematic diagram illustrating the second boundary cleaning step shown in FIG. 11. FIG. [Figure 13] 12 is a schematic diagram illustrating the second protective surface cleaning step shown in FIG. 11. FIG. [Figure 14] 7 is a flowchart of cleaning the first cover member shown in FIG. 6. [Figure 15] 15 is a schematic diagram illustrating the outer surface cleaning step shown in FIG. 14. FIG. [Figure 16] 15 is a schematic diagram illustrating the first protective surface cleaning step shown in FIG. 14. FIG. [Figure 17] 15 is a schematic diagram illustrating the first boundary cleaning step shown in FIG. 14. FIG. [Figure 18] FIG. 10 is a schematic view showing a first modified example of the second wiping member. [Figure 19] FIG. 10 is a schematic view showing a second modified example of the second wiping member. [Figure 20] 20 is a schematic diagram illustrating a method for cleaning the first cover member with the second wiping member of FIG. 19. FIG. [Figure 21] FIG. 10 is a schematic view showing a third modified example of the second wiping member. DETAILED DESCRIPTION OF THE INVENTION

[0007] 1 to 21, a method for cleaning the ejection head 23 according to an embodiment will be described. The ejection head 23 is mounted, for example, in an inkjet printer, which is an example of a printing device 11. The printer performs printing by ejecting ink, which is an example of a liquid, onto a medium 10.

[0008] <Overall configuration of the printing device> As shown in FIG. 1, printing device 11 includes an outer case 12, a conveying device 13, and an ejection mechanism 14. Printing device 11 may also include a support table 15 that supports medium 10 within outer case 12. Medium 10 is, for example, roll paper or paper cut to a specified size. Conveying device 13 conveys medium 10 onto support table 15.

[0009] The printing device 11 may also include a movement mechanism 16 for moving the ejection mechanism 14 back and forth along the printing direction. The ejection mechanism 14 is configured to eject liquid in an ejection direction toward the medium 10. When ejecting the liquid, at least one of the ejection mechanism 14 and the medium 10 moves along the printing direction. In other words, the ejection mechanism 14 performs printing while moving relative to the medium 10 along the printing direction.

[0010] The ejection direction is a direction that intersects with, for example, is perpendicular to, the printing direction. In this disclosure, a direction that intersects with, for example, is perpendicular to both the printing direction and the ejection direction is referred to as the first direction Y. The first direction Y is, for example, the width direction of the medium 10. In this disclosure, the printing direction is the second direction X, and the ejection direction is the third direction Z.

[0011] In the drawings showing the structure of the present disclosure, coordinate axes may be omitted, but all are shown using the same XYZ coordinate system. In these drawings, the right side is the second direction X (hereinafter also referred to as the "+X direction"), and the left side is the direction opposite to the second direction X (hereinafter also referred to as the "-X direction"). In this disclosure, the downward direction (the direction toward the medium 10) is the third direction Z (hereinafter also referred to as the "+Z direction"), and the upward direction is the direction opposite to the third direction Z (hereinafter also referred to as the "-Z direction"). In each drawing, differences in shape and size of components are exaggerated and less relevant components are omitted to clearly illustrate the main points of the present disclosure.

[0012] The printing device 11 may include an attachment portion 18 for attaching one or more liquid containers 17. The liquid container 17 is, for example, a tank, cartridge, or pack that contains liquid. The liquid container 17 may be detachably attached to the ejection mechanism 14. The multiple liquid containers 17 may contain different types of liquid, for example, inks of different colors. Liquid may be supplied to the liquid container 17 from another liquid container through a supply tube (not shown). The other liquid container is placed inside or outside the exterior case 12.

[0013] The printing device 11 may include an operation panel 19 and a controller 100. The operation panel 19 includes, for example, a touch panel display, keys, buttons, or switches. The controller 100 can acquire the details of operations performed by the user via the operation panel 19. The controller 100 can display various types of information on the display of the operation panel 19.

[0014] The printing device 11 includes a cleaning unit 20. The printing device 11 may also include an inspection mechanism 21 and a flushing box 22. The cleaning unit 20, inspection mechanism 21, flushing box 22, and support base 15 may be arranged in this order along the second direction X. The ejection mechanism 14 ejects liquid into the inspection mechanism 21 to inspect the presence or status of ejection defects. The ejection mechanism 14 performs flushing by ejecting liquid into the flushing box 22 at specified timing.

[0015] <Control mechanism> As shown in FIG. 1, the controller 100 may include a processing circuit 101, a storage unit 102, and a communication unit 103. The storage unit 102 includes non-volatile memory such as RAM and ROM. The storage unit 102 stores various programs and information used when executing the programs, such as various thresholds. The printing device 11 may be equipped with various removable memories.

[0016] The processing circuitry 101 is configured to execute software processing according to the present disclosure. The processing circuitry 101 may include dedicated hardware circuits (e.g., ASICs) that process at least part of the software processing. That is, the software processing may be executed by processing circuitry that includes at least one of one or more software processing circuits and one or more dedicated hardware circuits.

[0017] The communication unit 103 may include various types of removable memory and communication interface circuits. The communication interface circuit is configured to communicate with other devices connected to the printing device 11 via wire or wirelessly in accordance with various communication protocols. The processing circuit 101 can obtain print jobs, which are data for printing, from other devices (e.g., a user's computer) via the communication unit 103. The processing circuit 101 executes liquid ejection operations and various maintenance operations based on programs stored in the memory unit 102.

[0018] The processing circuit 101 causes the liquid to be ejected based on instructions input through, for example, the operation panel 19. More specifically, the ejection mechanism 14 is caused to eject liquid from the ejection mechanism 14 while moving back and forth toward the medium 10 transported on the support table 15. In this way, if the printing device 11 is a printer, printing is performed. The area on the support table 15 where the liquid is ejected for printing is called the printing area.

[0019] The processing circuit 101 performs a series of maintenance operations including cleaning, for example, every time a certain period of time (e.g., one hour) of liquid ejection (printing operation) has elapsed. In addition, the processing circuit 101 may also perform a series of maintenance operations before liquid ejection starts or after liquid ejection has ended.

[0020] <Discharge mechanism> 2 and 3, the ejection mechanism 14 has one or more ejection heads 23. The ejection heads 23 are configured to eject liquid onto a medium 10 that moves relative to the ejection heads 23. Each ejection head 23 has a head body 24, a first cover member 30, and a second cover member 40. The head body 24 may have a generally rectangular parallelepiped outer shape. The head body 24 has a plurality of nozzles 25 that eject liquid. The head body 24 includes a nozzle surface 26 in which the plurality of nozzles 25 open.

[0021] The first direction Y and the second direction X are directions along the nozzle surface 26. The third direction Z is a direction that intersects with, for example, is perpendicular to, the nozzle surface 26. The nozzle surface 26 includes a first edge 27 and a second edge 28. The multiple nozzles 25 are located between the first edge 27 and the second edge 28. The first edge 27 and the second edge 28 extend in the first direction Y.

[0022] The head body 24 has side walls 24a and 24b that intersect with the nozzle surface 26. The first side wall 24a extends in the −Z direction from a first edge 27. The second side wall 24b extends in the −Z direction from a second edge 28.

[0023] The first cover member 30 is attached to the head body 24 so as to cover the first edge 27. The second cover member 40 is attached to the head body 24 so as to cover the second edge 28. The cover members 30, 40 are provided to protect the nozzle surface 26 from, for example, foreign matter adhering to the medium 10 (see FIG. 1 ) or a bent medium 10. The cover members 30, 40 are preferably disposed at the leading edge of the ejection head 23 in the printing direction. In the present disclosure, because the ejection head 23 moves back and forth along the second direction X, the first cover member 30 and the second cover member 40 are disposed at both ends of the nozzle surface 26 in the second direction X.

[0024] The first cover member 30 has a first protective surface 31, an outer surface 32, and a first boundary surface 33. The first protective surface 31 protrudes in the third direction Z beyond the nozzle surface 26. The first protective surface 31 extends in the first direction Y and the second direction X. The first protective surface 31 may be parallel to the nozzle surface 26. The outer surface 32 extends along the first side wall 24a. The first boundary surface 33 is a first boundary located between the first protective surface 31 and the nozzle surface 26. The region between the first boundary surface 33 and the nozzle 25 in the second direction X is referred to as a first boundary region 26a (see FIG. 3 ).

[0025] The second cover member 40 has a second protective surface 41, an outer surface 42, and a second boundary surface 43. The second protective surface 41 protrudes in the third direction Z beyond the nozzle surface 26. The second protective surface 41 extends in the first direction Y and the second direction X. The second protective surface 41 may be parallel to the nozzle surface 26. The outer surface 42 extends along the second side wall 24b. The second boundary surface 43 is a second boundary located between the second protective surface 41 and the nozzle surface 26. The region between the second protective surface 41 and the nozzle 25 in the second direction X is referred to as the second boundary region 26b (see FIG. 3).

[0026] The nozzle surface 26 includes a first boundary that is a boundary with the first cover member 30, and a second boundary that is a boundary with the second cover member 40. The first boundary and the second boundary extend in the first direction Y. The first boundary and the second boundary (second boundary surface 43) may be parallel to each other. The first boundary is substantially the first boundary surface 33, and the second boundary is substantially the second boundary surface 43.

[0027] <Cleaning unit> As shown in FIG. 4, the cleaning unit 20 (see FIG. 1) includes a first cleaning unit 50 and a second cleaning unit 60. The first cleaning unit 50 and the second cleaning unit 60 are used to clean one or more ejection heads 23. The first cleaning unit 50 includes one or more first wiping members 51, a first holding unit 52, and one or more first caps 53. The second cleaning unit 60 includes one or more second wiping members 61, a second holding unit 62, and one or more second caps 63. The second cleaning unit 60 may include one or more cleaners 64. The length dimension of the second wiping members 61 in the first direction Y is greater than the length dimension of the cover members 30, 40 in the first direction Y.

[0028] 4 shows a state in which the discharge head 23 is in the home position, the first cleaning unit 50 is in the first origin position, and the second cleaning unit 60 is in the second origin position. The discharge head 23, the first cleaning unit 50, and the second cleaning unit 60 may each be independently movable in the +X direction and the −X direction from the position shown in FIG. 4. The discharge head 23 may further be capable of reciprocating along the first direction Y. The first cleaning unit 50 and the second cleaning unit 60 may each be independently movable in the +Z direction and the −Z direction from the position shown in FIG. 4.

[0029] In other words, the first cleaning unit 50 and the second cleaning unit 60 can each independently move back and forth in both the second direction X and the third direction Z. This allows the cleaning units 50, 60 and the discharge head 23 to move relative to each other along each of the first direction Y, the second direction X, and the third direction Z.

[0030] The second origin position is located between the home position and the first origin position. When the first cleaning unit 50 is in the first origin position and the second cleaning unit 60 is in the second origin position, the first cleaning unit 50 and the second cleaning unit 60 do not come into contact with each other even if one of them moves past the other in the second direction X.

[0031] The first holding part 52 holds the first wiping member 51 and the first cap 53 on a first side (upper side) that can face the discharge mechanism 14 in the third direction Z. When the discharge mechanism 14 has a plurality of discharge heads 23, the first cleaning part 50 may have at least the same number of first wiping members 51 and first caps 53 as the discharge heads 23. The length dimension of the first wiping member 51 in the first direction Y is greater than the length dimension of the cover members 30, 40 in the first direction Y.

[0032] The first wiping member 51 is made of a material, such as an elastomer, that has lower liquid absorbency than the second wiping member 61. The first wiping member 51 is, for example, a plate-shaped elastic body. The first wiping member 51 is also called a wiper or a rubber wiper. The first cap 53 is, for example, a cleaning cap that receives liquid (waste liquid) discharged from the nozzles 25 for cleaning the ejection head 23.

[0033] When cleaning is performed, the second cleaning unit 60 retreats from the second origin position in the -X direction to provide space for the first cleaning unit 50 to move in the -Z direction from the first origin position. The position of the second cleaning unit 60 when it moves in the -X direction to allow the first cleaning unit 50 to move in the -Z direction is called the second retreat position. After the second cleaning unit 60 has moved to the second retreat position, when the first cleaning unit 50 moves in the -Z direction, the first cap 53 comes into contact with the nozzle surface 26, thereby capping the nozzle surface 26.

[0034] The second holding portion 62 holds the second wiping member 61 and the second cap 63 on a first side (upper side) that can face the discharge mechanism 14 in the third direction Z. The second holding portion 62 holds a cleaner 64 on a second side (lower side) opposite the first side in the third direction Z. The cleaner 64 is made of a material that can absorb liquid. The cleaner 64 is used to clean the first wiping member 51.

[0035] When the cleaner 64 cleans the first wiping member 51, the first cleaning unit 50 moves in the -Z direction so that the tip of the first wiping member 51 is positioned between the lower end (tip end) and upper end (base end) of the cleaner 64 in the third direction Z. The position of the first cleaning unit 50 at this time is referred to as the cleaned position. In this state, the second cleaning unit 60 moves along the second direction X, whereby the cleaner 64 cleans the first wiping member 51.

[0036] When the discharge mechanism 14 has a plurality of discharge heads 23, the second cleaning unit 60 may have at least the same number of second wiping members 61 and second caps 63 as the discharge heads 23. The second cleaning unit 60 may have the same number of cleaners 64 as the discharge heads 23.

[0037] The second cap 63 is a moisturizing cap that covers the nozzle surface 26 when liquid is not being ejected, for example, to prevent the nozzles 25 from drying out. When the second cleaning unit 60 moves in the -Z direction from the state shown in FIG. 4, moisturizing capping is performed. During moisturizing capping, the tip (lip portion) of the second cap 63 comes into contact with the nozzle surface 26 so as to surround the nozzles 25, and then the second holding unit 62 moves closer to the nozzle surface 26 by a specified distance. This causes the lip portion of the second cap 63 to elastically deform and come into close contact with the nozzle surface 26. The position of the second cleaning unit 60 at this time is called the capping position.

[0038] The second wiping member 61 is made of a material capable of absorbing liquid. The second wiping member 61 is also called a wiper pad. The material capable of absorbing liquid is, for example, cloth or paper with excellent cleaning or absorbency. The cloth may be a nonwoven fabric or a woven fabric, such as a woven fabric made of polyester, nylon, or cotton. The second wiping member 61 may be made of an elastic material.

[0039] 5, when the second wiping member 61 is a sheet-like absorbent material, the second cleaning unit 60 may have an elastic body 65 around which the second wiping member 61 is wound. The elastic body 65 may be, for example, a rubber sponge such as urethane foam or silicone rubber, or may be soft solid rubber (for example, silicone rubber).

[0040] The second cleaning part 60 may have a holder 66 for removably mounting the second wiping member 61 to the second holding part 62. The second wiping member 61 may be removably attached to the holder 66. In Figure 5, the shape of the second holding part 62 is depicted in a simplified manner.

[0041] The second wiping member 61 has a top surface 67, a first side surface 68, and a second side surface 69. The top surface 67 extends in both the first direction Y and the second direction X. The first side surface 68 and the second side surface 69 extend in the +Z direction from both ends of the top surface 67 in the second direction X. In particular, when the second cleaning part 60 has an elastic body 65, or when the second wiping member 61 is an elastic body, the top surface 67 is elastically deformable. The width of the top surface 67 in the second direction X is approximately the same as the width of the protective surface 31 in the second direction X.

[0042] When the second wiping member 61 cleans the discharge head 23, after the top surface 67 comes into contact with the discharge head 23, the second holding portion 62 may move closer to the nozzle surface 26 by a pressing distance. As a result, the second wiping member 61 is pressed against the discharge head 23 and elastically deforms. By increasing the pressing distance, the discharge head 23 is cleaned with a stronger force. The pressing distance may be set in advance or may be freely set by the user.

[0043] When the second wiping member 61 cleans the discharge head 23, the second wiping member 61 and the discharge head 23 are moved back and forth relative to each other in the first direction Y. For example, the discharge head 23 moves back and forth multiple times in the first direction Y while the second wiping member 61 is in contact with the discharge head 23. The amount of movement in the forward (return) direction at this time can be, for example, 1.0 mm or more. Alternatively, the second cleaning unit 60 may move back and forth multiple times relative to the discharge head 23 in the first direction Y. Increasing the number of reciprocations at this time allows the discharge head 23 to be cleaned more thoroughly. The number of reciprocations may be set in advance or may be freely set by the user. When cleaning a particularly dirty area or an area where dirt is difficult to remove, the pressing distance may be increased or the number of reciprocations may be increased.

[0044] The wiping direction is the direction of relative reciprocal movement between the ejection head 23 and the second wiping member 61. The wiping direction is the first direction Y, which intersects, for example, is perpendicular to, the wiping direction (second direction X) described below. Therefore, when the wiping of the nozzle surface 26 by the first wiping member 51 is vertical wiping, it can be said that the wiping is horizontal wiping.

[0045] 4 shows the height Ha of the protective surfaces 31 and 41, the height Hb of the nozzle surface 26, and the height Hc of the upper ends of the outer surfaces 32 and 42. "Height" refers to the position in the third direction Z. Height Hb is located higher than height Ha, and height Hc is located higher than height Hb.

[0046] When wiping the protective surfaces 31, 41, the second cleaning unit 60 moves in the -Z direction by a pressing distance from the position where the top surface 67 is at height Ha. In this way, the position of the second cleaning unit 60 when the top surface 67 is pressed against the protective surface 31 (or protective surface 41) is called the protective surface pressing position.

[0047] When wiping the boundary surfaces 33, 43, the second cleaning unit 60 moves in the -Z direction from the position where the top surface 67 is at height Hb by a pressing distance. In this way, the position of the second cleaning unit 60 when the top surface 67 is pressed against the boundary surface 33 (or boundary surface 34) and boundary region 26a (or boundary region 26b) is referred to as the nozzle surface pressing position. The position of the top surface 67 in the third direction Z at the nozzle surface pressing position is higher than the position of the top surface 67 in the third direction Z at the protective surface pressing position. Furthermore, when the top surface 67 is in the protective surface pressing position, the top surface 67 does not contact most of the boundary surface 33 (or boundary surface 34) or boundary region 26a (or boundary region 26b), and no gap is created between the top surface 67 and the second protective surface 41 (or first protective surface 31).

[0048] When wiping the outer surface 32, the second cleaning unit 60 is positioned at a position where the second side surface 69 contacts the outer surface 32. The position of the second cleaning unit 60 at this time is referred to as the outer surface position. The ejection head 23 moves in the +X direction a further pressing distance from the position where the outer surface 32 contacts the second side surface 69. The position of the ejection head 23 when the outer surface 32 is pressed against the second side surface 69 in this way is referred to as the outer surface pressing position. The ejection head 23 moves back and forth along the first direction Y at the outer surface pressing position. This allows the outer surface 32 to be wiped.

[0049] <Cleaning the cover> When the second wiping member 61 cleans the second cover member 40, the second wiping member 61 simultaneously wipes the second boundary surface 43 and the second boundary region 26b (second boundary cleaning step). In the second boundary cleaning step, the second boundary surface 43 and the second boundary region 26b that the second wiping member 61 wipes are regions that include the second boundary. Simultaneously with or after the second boundary cleaning step, the second wiping member 61 may preferably wipe the second protective surface 41 (second protective surface cleaning step).

[0050] When the second wiping member 61 cleans the first cover member 30, it is preferable that the second wiping member 61 simultaneously wipes the first boundary surface 33 and the first boundary region 26a (first boundary cleaning step). In the first boundary cleaning step, the first boundary surface 33 and the first boundary region 26a that are wiped by the second wiping member 61 are regions that include the first boundary.

[0051] Simultaneously with, or before or after the first boundary cleaning step, the second wiping member 61 may wipe the first protective surface 31 (first protective surface cleaning step). Furthermore, the second wiping member 61 may also wipe the outer surface 32. For example, the second wiping member 61 may wipe the outer surface 32, the first protective surface 31, and the first boundary surface 33 in that order.

[0052] Each time the second wiping member 61 finishes cleaning one of the multiple cleaning regions of the cover member 30, 40 (e.g., the protective surfaces 31, 41 and the boundary surfaces 33, 43), the second cleaning unit 60 may move away from the discharge head 23 and move relative to the discharge head 23 to contact the next cleaning region. More specifically, at least one of the second cleaning unit 60 and the discharge head 23 moves so that the second wiping member 61 contacts a certain cleaning region, and the discharge head 23 moves back and forth along the first direction Y while in contact with the second wiping member 61. In this series of operations, the relative movement along the first direction Y may be achieved by movement of the discharge head 23. In addition, in this series of operations, the relative movement along the second direction X and the third direction Z may be achieved by movement of the second cleaning unit 60.

[0053] <Maintenance operation> The series of maintenance operations includes, for example, cleaning, wiping, flushing, and wiping off. Cleaning is a maintenance operation in which air bubbles and foreign matter inside the ejection head 23 are discharged together with the liquid through the nozzles 25. Wiping is an example of cleaning in which the first wiping member 51 wipes the nozzle surface 26. Flushing is a maintenance operation in which liquid is ejected from the nozzles 25. Wiping is an example of cleaning in which the second cleaning unit 60 removes liquid and foreign matter adhering to the ejection head 23.

[0054] The content of the series of maintenance operations can be changed by user input or by programming. The series of maintenance operations may be performed, for example, before printing, during printing, or after printing. For example, the series of maintenance operations may be performed at regular intervals during printing.

[0055] After cleaning, droplets or foreign matter (e.g., paper powder) may remain on the nozzle surface 26. For this reason, wiping may be performed after cleaning. Wiping scrapes off droplets and foreign matter that have adhered to the nozzle surface 26 from the vicinity of the nozzles 25. Liquid containing foreign matter scraped off by wiping may remain near the cover members 30, 40.

[0056] For example, when the first cleaning unit 50 performs wiping while moving in the −X direction relative to the ejection head 23, the tip of the first wiping member 51 elastically deforms to clean the first cover member 30, the nozzle surface 26, and the second cover member 40 in that order. The direction in which the contact portion of the first wiping member 51 with the ejection head 23 moves during wiping is called the wiping direction.

[0057] Because the first wiping member 51 is made of a material that does not easily absorb liquid, foreign matter containing liquid scraped off by the first wiping member 51 is collected toward the second cover member 40, which is located downstream in the wiping direction (-X direction). Because there is a step (second boundary) between the nozzle surface 26 and the second cover member 40, foreign matter collected by wiping tends to accumulate in this step portion.

[0058] After wiping, the meniscus inside the nozzle 25 may be disturbed. For this reason, after wiping, flushing may be performed in which liquid is ejected from the nozzle 25. Furthermore, after wiping or flushing, the ejection head 23 may be wiped with the second wiping member 61. In particular, the second wiping member 61 may mainly wipe the cover members 30 and 40, which are prone to staining.

[0059] An example of a series of maintenance operation procedures is shown in Figure 6. First, if moisture capping has been performed, the moisture capping is released (step S11). More specifically, the second cleaning unit 60 moves in the +Z direction from the capping position to the second origin position, thereby separating the second cap 63 from the nozzle surface 26. The state after the moisture capping has been released is shown in Figure 4.

[0060] Next, preparation for cleaning is performed (step S12). More specifically, as shown in Fig. 7, the second cleaning unit 60 moves in the -X direction from the second origin position to the second retracted position. Then, the first cleaning unit 50 moves in the -Z direction from the first origin position to the capping position. In this capped state, cleaning is performed by discharging liquid from the ejection head 23 into the first cap 53 (step S13).

[0061] After cleaning, preparation for wiping is performed (step S14). More specifically, the first cleaning unit 50 moves in the +Z and -X directions from the capping position to the wiping start position shown by the solid line in Fig. 8. The wiping start position is the position where the tip of the first wiping member 51 contacts the outer surface 32 (see Fig. 4).

[0062] Next, the first wiping member 51 cleans the ejection head 23 (step S15). More specifically, the first cleaning unit 50 moves in the -X direction from the wiping start position to the wiping end position indicated by the two-dot chain line in Fig. 8. At this time, the first wiping member 51 successively wipes the first cover member 30, the nozzle surface 26, and the second cover member 40 in this order (nozzle surface wiping step).

[0063] In the nozzle surface wiping process, for example, the first cleaning unit 50 moves in the wiping direction (-X direction) relative to the stopped ejection head 23. In other words, in the nozzle surface wiping process, the ejection head 23 and the first cleaning unit 50 move relative to each other such that the first wiping member 51 moves from the first edge 27 (see FIG. 2) toward the second edge 28 (see FIG. 2). Alternatively, wiping may be performed by moving the ejection head 23 in the +X direction relative to the stopped first cleaning unit 50. Alternatively, wiping may be performed by both the first cleaning unit 50 and the ejection head 23 moving in opposite directions.

[0064] After wiping in step S15, wiper cleaning preparation may be performed (step S16). More specifically, first, the first cleaning unit 50 moves in the +Z direction from the wiping end position to the first retracted position shown in FIG. 9. The first retracted position allows the second cleaning unit 60, which moves along the second direction X, to pass through. Then, the second cleaning unit 60 moves in the +X direction from the second retracted position to the cleaning start position shown by the solid line in FIG. 9. Thereafter, the first cleaning unit 50 moves in the -Z direction from the first retracted position to the cleaning position shown by the solid line in FIG. 10.

[0065] Next, the cleaner 64 cleans the first wiping member 51 (step S17, first wiping member cleaning step). During cleaning by the cleaner 64, the first cleaning unit 50 and the second cleaning unit 60 are moved relative to each other along the second direction X. For example, the second cleaning unit 60 is moved in the −X direction relative to the stopped first wiping member 51. Alternatively, the first cleaning unit 50 may be moved in the +X direction relative to the stopped cleaner 64, or both the first cleaning unit 50 and the cleaner 64 may move in opposite directions. Furthermore, the relative movement between the cleaner 64 and the first cleaning unit 50 may be further performed by reversing the direction of travel in the second direction X, or multiple reciprocating movements alternately moving in the −X direction and the +X direction may be performed. After step S17, the discharge head 23 may be returned to the home position, the first cleaning unit 50 may be returned to the first origin position, and the second cleaning unit 60 may be returned to the second origin position. The cleaning of the first wiping member 51 by the cleaner 64 may be performed before wiping.

[0066] Next, the second wiping member 61 cleans the second cover member 40 (step S20, second cover member cleaning step). In the example of FIG. 6, of the cover members 30, 40, the one that is more likely to get dirty, i.e., the second cover member 40 that is downstream in the wiping direction, is cleaned first. After cleaning the second cover member 40, the second wiping member 61 cleans the first cover member 30 (step S40, first cover member cleaning step). This completes the cleaning of the ejection head 23.

[0067] If printing has finished at this stage, moisture capping is performed (step S60), and the process ends. More specifically, the ejection head 23 moves to the home position, and the second cleaning unit 60 moves to the second origin position, and then the second cleaning unit 60 moves to the capping position. If a series of maintenance operations is performed during printing, steps S11 and S60 may be omitted.

[0068] After wiping in step S15, an inspection may be performed using the inspection mechanism 21 to check whether or not there is a discharge defect. Furthermore, if a discharge defect is detected in the inspection, cleaning, wiping, and inspection may be repeated again. When wiping is performed multiple times in succession in this manner, the wiper cleaning and cleaning of the cover members 30 and 40 may be performed after the final wiping.

[0069] <How to clean the second cover member> The second cover member cleaning step of step S20 is shown in detail in Fig. 11. During steps S20 and S40, the first cleaning unit 50 is stopped at the second retracted position, and therefore a description thereof will be omitted here.

[0070] First, the discharge head 23 moves in the +X direction from the home position shown in Fig. 4 to the second boundary cleaning position (step S21). As shown by the two-dot chain line in Fig. 12, the second boundary cleaning position is a position where the second boundary surface 43 and the second boundary region 26b are aligned with the top surface 67 of the second wiping member 61 in the third direction Z when the second cleaning unit 60 is in the second origin position. In other words, the second boundary cleaning position is a position where the second boundary surface 43 and the second boundary region 26b are directly above the top surface 67 when the second cleaning unit 60 is in the second origin position.

[0071] Next, the second cleaning unit 60 moves in the X direction from the cleaning end position to the second origin position (step S22). As a result, the second boundary surface 43 and the second boundary region 26b are positioned directly above the top surface 67. Here, the process has been described in which the second cleaning unit 60 does not move to the second origin position after step S17, but remains at the point where step S17 ended (cleaning end position). However, if the second cleaning unit 60 is moved to the second origin position after step S17, step S22 is omitted. Next, the second cleaning unit 60 moves in the -Z direction from the second origin position to the nozzle face pressing position (step S23).

[0072] As the second wiping member 61 is pressed against the ejection head 23 in the process of reaching the nozzle face pressing position, the top surface 67 is elastically deformed as shown by the solid lines in Fig. 12. At this time, the second wiping member 61 is pressed against the second protective surface 41, the second boundary surface 43, and the second boundary region 26b. At this time, depending on how the top surface 67 deforms, a gap may be formed between the top surface 67 and the second protective surface 41.

[0073] In this state, the discharge head 23 moves back and forth at the second boundary cleaning position along the first direction Y multiple times (for example, five times) relative to the second cleaning unit 60 (step S24), thereby wiping at least the second boundary surface 43 and the second boundary region 26b (second boundary cleaning step).

[0074] After step S24, the second cleaning unit 60 retreats in the +Z direction from the nozzle surface pressing position to the second origin position (step S25). This causes the second wiping member 61 to move away from the discharge head 23. Next, the discharge head 23 moves in the +X direction from the second boundary cleaning position to the second protective surface cleaning position shown in FIG. 13 (step S26). The second protective surface cleaning position is a position where the entire second protective surface 41 faces the top surface 67 (shown by the two-dot chain line in FIG. 13) in the third direction Z.

[0075] Thereafter, the second cleaning part 60 moves in the -Z direction from the second origin position to the nozzle face pressing position (step S27). As a result, the top surface 67 comes into contact with the entire second protective surface 41, and the second wiping member 61 is pressed against the second protective surface 41. In this way, at the second protective surface cleaning position, when viewed from the Z direction, most of the top surface 67 overlaps with the second protective surface 41, and only a small portion overlaps with the boundary region 26b, so no gap is created between the top surface 67 and the second protective surface 41.

[0076] Next, the discharge head 23 moves back and forth multiple times (for example, twice) along the first direction Y at the second protective surface cleaning position (step S28). This cleans the entire second protective surface 41 (second protective surface cleaning process). Even if a gap occurs between the top surface 67 and the second protective surface 41 in the second boundary cleaning process, the entire second protective surface 41 can be reliably cleaned in the second protective surface cleaning process. The number of times the discharge head 23 moves back and forth in the second protective surface cleaning process may be less than the number of times the discharge head 23 moves back and forth in the second boundary cleaning process.

[0077] After step S28, the second cleaning unit 60 retreats in the +Z direction from the nozzle surface pressing position to the second origin position (step S29). This causes the second wiping member 61 to move away from the discharge head 23. Next, the discharge head 23 returns in the -X direction from the second protective surface cleaning position to the home position (step S30). Note that after step S28, the second wiping member 61 may further clean the outer surface 42.

[0078] <How to clean the first cover member> FIG. 14 shows details of the first cover member cleaning step S40. First, the second cleaning unit 60 moves in the -Z direction from the second origin position to the outer surface position shown in Fig. 15 (step S41). Next, the discharge head 23 moves in the +X direction from the home position to the outer surface pressing position (step S42). As a result, the outer surface 32 is pressed against the second wiping member 61.

[0079] In this state, the ejection head 23 moves back and forth multiple times (for example, three times) along the first direction Y at the outer surface pressing position (step S43). This causes the outer surface 32 to be wiped (outer surface wiping step). That is, cleaning the first cover member 30 includes an outer surface wiping step in which the second wiping member 61 cleans the outer surface 32. The outer surface 32 comes into contact with the first wiping member 51 when wiping begins, and therefore may be contaminated. Therefore, wiping is recommended. In contrast, the outer surface 42, which is downstream in the wiping direction, does not need to be cleaned because it is less likely to become contaminated.

[0080] Next, the second cleaning unit 60 retreats in the +Z direction from the outer surface position to the second origin position (step S44). This causes the second wiping member 61 to move away from the discharge head 23. Next, the discharge head 23 moves in the +X direction from the outer surface pressing position to the first protective surface cleaning position shown in Fig. 16 (step S45). The first protective surface cleaning position is a position where the entire first protective surface 31 faces the top surface 67 (shown by the two-dot chain line in Fig. 16) in the third direction Z.

[0081] Thereafter, the second cleaning unit 60 moves in the −Z direction from the second origin position to the nozzle face pressing position (step S46). As a result, the top surface 67 comes into contact with the entire first protective surface 31, and the second wiping member 61 is pressed against the first protective surface 31. In this way, at the first protective surface cleaning position, when viewed from the third direction Z, most of the top surface 67 overlaps with the first protective surface 31, and only a small portion overlaps with the boundary region 26a, so no gap is created between the top surface 67 and the first protective surface 31.

[0082] Next, the discharge head 23 moves back and forth multiple times (for example, twice) in the first direction Y at the first protective surface cleaning position (step S47). This results in wiping of the first protective surface 31 (first protective surface cleaning step). The number of times the discharge head 23 moves back and forth in the first protective surface cleaning step may be less than the number of times the discharge head 23 moves back and forth in the outer surface cleaning step.

[0083] After step S24, the second cleaning unit 60 retreats in the +Z direction from the nozzle surface pressing position to the second origin position (step S48). This causes the second wiping member 61 to move away from the discharge head 23. Next, the discharge head 23 advances in the +X direction from the first protective surface cleaning position to the first boundary cleaning position (step S49).

[0084] 17, when the second cleaning unit 60 is in the second origin position, the first boundary cleaning position is a position where the first boundary surface 33 and the first boundary region 26a are aligned with the top surface 67 of the second wiping member 61 in the third direction Z. In other words, the first boundary cleaning position is a position where the first boundary surface 33 and the first boundary region 26a are directly above the top surface 67 when the second cleaning unit 60 is in the second origin position.

[0085] Next, the second cleaning unit 60 moves in the -Z direction from the second origin position to the nozzle face pressing position (step S50). In the process of reaching the nozzle face pressing position, the second wiping member 61 is pressed against the ejection head 23, causing the top surface 67 to elastically deform, as shown by the solid lines in FIG. 17. At this time, the second wiping member 61 is pressed against the first protective surface 31, the first boundary surface 33, and the first boundary region 26a. At this time, depending on how the top surface 67 deforms, a gap may be formed between the top surface 67 and the first protective surface 31.

[0086] In this state, the discharge head 23 moves back and forth at the first boundary cleaning position multiple times (for example, five times) along the first direction Y (step S51), thereby wiping at least the first boundary surface 33 and the first boundary region 26a (first boundary cleaning step).

[0087] Because the boundary portion has corners that make it difficult to remove dirt, the number of reciprocating movements of the discharge head 23 in the first boundary cleaning step may be greater than the number of reciprocating movements of the discharge head 23 in the first protective surface cleaning step and the outer surface cleaning step. Furthermore, if the dirt on the second boundary is more severe than that on the first boundary, the number of reciprocating movements of the discharge head 23 in the second boundary cleaning step may be greater than the number of reciprocating movements of the discharge head 23 in the first boundary cleaning step (for example, 10 times).

[0088] After step S51, the second cleaning unit 60 retreats in the +Z direction from the nozzle surface pressing position to the second origin position (step S52). This causes the second wiping member 61 to move away from the discharge head 23. Next, the discharge head 23 returns in the -X direction from the first protective surface cleaning position to the home position (step S53).

[0089] <Operation of the embodiment> The second wiping member 61, which is capable of absorbing liquid, needs to be replaced when it is used up to clean the discharge head 23. If the second wiping member 61 is a roll sheet, the frequency of replacement can be reduced, but a relatively large mechanism for unwinding and rewinding the sheet is required. In this regard, the wiping member 61 is detachable from the second cleaning unit 60, so it can be installed in a relatively small space.

[0090] The second wiping member 61 is capable of absorbing liquid, but if the dirt on the ejection head 23 has become viscous due to drying, or if there is a step in the area to be cleaned, it may not be possible to remove the dirt simply by pressing the second wiping member 61 against the area to be cleaned. Even in such cases, the dirt can be removed by moving the second wiping member 61 back and forth multiple times. In particular, more efficient removal is achieved by moving the second wiping member 61 back and forth along the first direction Y in which the step extends.

[0091] A threshold value for the number of uses (e.g., 25 times) may be set for the second wiping member 61 to determine that the member has been used. When the second wiping member 61 has been used more than the threshold value, the controller 100 may issue a message urging the user to replace the second wiping member 61 at predetermined intervals until the second wiping member 61 is replaced. Alternatively, or in addition, cleaning by the second wiping member 61 may be stopped when the second wiping member 61 has been used significantly more than the threshold value (e.g., twice the threshold value).

[0092] In addition to the above-described automatic cleaning by the cleaning unit 20, manual cleaning may also be performed by a user or technician. The controller 100 may be configured to issue a message prompting the user to perform such manual cleaning each time a specified period of time has elapsed. Furthermore, the specified period of time for issuing the message may be shortened (for example, halved) from when cleaning by the second wiping member 61 is stopped due to the number of uses being significantly exceeded until the second wiping member 61 is replaced.

[0093] <Effects of the embodiment> The above-described device and method can provide the following effects. (1) The step of cleaning the second cover member 40 includes a second boundary cleaning step. The second boundary cleaning step can remove dirt that has adhered to the step between the second cover member 40 and the nozzle surface 26, more specifically, the second boundary surface 43 and the second boundary region 26b.

[0094] (2) After the second boundary cleaning step, the second protective surface cleaning step is further performed, whereby the second protective surface 41 can be cleaned. (3) The first cover member cleaning step includes a first protective surface cleaning step, in which first protective surface 31 can be cleaned.

[0095] (4) The first cover member cleaning process includes a first boundary cleaning process, which is performed after the first protective surface cleaning process. The first boundary cleaning process can remove dirt that has adhered to the step between the first cover member 30 and the nozzle surface 26, more specifically, the first boundary surface 33 and the first boundary region 26a.

[0096] (5) The step of cleaning the first cover member 30 includes a step of wiping the outer surface 32. By the step of wiping the outer surface 32, dirt adhering to the outer surface 32 can be removed. (6) In order to clean each portion of the cover members 30, 40, the discharge head 23 moves in the +X direction relative to the second wiping member 61. The stopping accuracy of the discharge head 23 after moving in the +X direction may differ from the stopping accuracy of the discharge head 23 after moving in the -X direction. In this case, by limiting the movement of the discharge head 23 for aligning the discharge head 23 with the second wiping member 61 in the second direction X to movement in the +X direction, which has high stopping accuracy in the movement of the discharge head 23 in the second direction X, it is possible to more accurately align the discharge head 23 with the second wiping member 61.

[0097] (7) The second wiping member 61 is detachable from the second holder 62. Therefore, when the second wiping member 61 becomes soiled, it can be replaced with a new second wiping member 61. (8) By cleaning the first wiping member 51 with the cleaner 64 after wiping, the dirt on the first wiping member 51 will not be transferred to the discharge head 23 during the next wiping.

[0098] The above-described embodiments may be modified as shown in the following modified examples. In addition, the configurations included in these embodiments may be arbitrarily combined with the configurations included in the following modified examples, or the configurations included in the following modified examples may be arbitrarily combined with each other.

[0099] [First change example] As in a first modified example shown in FIG. 18 , the length dimension La of the top surface 67 in the second direction X may be greater than the length dimension L1 of the second protective surface 41 in the second direction X. That is, La - L1 > 0. In this case, if the second cleaning unit 60 is positioned so that the outer surface 42 and the side surface 69 are flush with each other, a surplus portion of the top surface 67 will be generated that faces the nozzle surface 26 but not the second protective surface 41 in the second direction X. The length dimension of this surplus portion in the second direction X is La - L1. When the second cleaning unit 60 is moved in the −Z direction to the nozzle surface pressing position with such a surplus portion generated, the surplus portion will come into contact with the boundary surface 33 and the boundary region 26a.

[0100] In this case, the discharge head 23 does not need to move along the second direction X between the second boundary cleaning step and the second protective surface cleaning step. That is, step S26 can be omitted. However, in step S27, the second cleaning unit 60 moves in the -Z direction from the second origin position to the protective surface pressing position. This ensures that the entire second protective surface 41 is cleaned in the second protective surface cleaning step, even if a gap occurs between the top surface 67 and the second protective surface 41 in the second boundary cleaning step.

[0101] In the first modified example, the length dimension La of the top surface 67 may be greater than the length dimension L1 of the first protective surface 31 in the second direction X. In this case, the discharge head 23 does not need to move along the second direction X between the first protective surface cleaning step and the first boundary cleaning step. That is, step S49 can be omitted. However, in step S46, the second cleaning unit 60 moves in the -Z direction from the second origin position to the protective surface pressing position. This ensures that the entire first protective surface 31 can be cleaned reliably in the first protective surface cleaning step, even if a gap occurs between the top surface 67 and the first protective surface 31 in the second boundary cleaning step. The length dimension of the first protective surface 31 may be the same as or different from the length dimension of the second protective surface 41.

[0102] [Second modification example] As in a second modified example shown in FIG. 19 , the second wiping member 61 may have a stepped protrusion 70 with a square outer shape that protrudes from the top surface 67 in the −Z direction. The stepped protrusion 70 has a side that becomes part of the first side surface 68, and has a corner that follows the shapes of the nozzle surface 26 (second boundary region 26b), the second boundary surface 43, and the second protective surface 41. More specifically, the stepped protrusion 70 has a top surface 72 that follows the second boundary region 26b, and an intersection surface 73 that follows the second boundary surface 43. A corner is also formed at the intersection between the top surface 67 and the stepped protrusion 70. Then, in the second boundary cleaning step, it is preferable to move the discharge head 23 back and forth along the first direction Y with the stepped protrusion 70 in contact with the second boundary region 26b, the second boundary surface 43, and the second protective surface 41.

[0103] In the second modified example, the first stepped protrusion 70 can clean the second boundary region 26b, the second boundary surface 43, and the second protective surface 41 at the same time, eliminating the need for two cleaning steps: a second boundary cleaning step and a second protective surface cleaning step. However, in step S23, the second cleaning unit 60 moves in the -Z direction from the second origin position to the protective surface pressing position. In the second modified example, at the protective surface pressing position, the top surface 67 and the entire surface of the second protective surface 41 are in contact with no gaps, the top surface 72 of the stepped protrusion 70 is in contact with the second boundary region 26b, and the intersecting surface 73 of the stepped protrusion 70 is in contact with the second boundary surface 43.

[0104] Furthermore, the stepped protrusion 70 may have a corner that conforms to the shapes of the first boundary region 26a and the first boundary surface 33. More specifically, when the top surface 72 of the stepped protrusion 70 contacts the second boundary region 26b, the side surface 68 connected to the top surface 72 may contact the first boundary surface 33. When cleaning the first cover member 30, the first boundary cleaning step may be performed after the first protective surface cleaning step. In the first protective surface cleaning step, as shown by the two-dot chain line in FIG. 19 , the second cleaning unit 60 may move in the −Z direction with the top surface 67 facing the first boundary surface 33 and the top surface 67 and the top surface 72 facing the first protective surface 31, thereby pressing the top surface 67 and the stepped protrusion 70 against the first protective surface 31 in a manner that crushes the stepped protrusion 70. Alternatively, in the first protective surface cleaning step, the stepped projection 70 may not contact the first protective surface 31, and only the top surface 67 may be pressed against the first protective surface 31, as shown by the two-dot chain line in FIG.

[0105] In the first boundary cleaning process of the second modified example, as shown by the solid line in Figure 20, the ejection head 23 is preferably moved back and forth along the first direction Y with the top surface 72 of the stepped protrusion 70 in contact with the first boundary region 26a and the side surface 68 in contact with the first boundary surface 33 at the same time.

[0106] [Third change example] As in a third modified example shown in FIG. 21 , the second wiping member 61 may have a first step-like protrusion 70 having a square outer shape and a second step-like protrusion 71 having a square outer shape. The step-like protrusions 70, 71 each protrude in the −Z direction from both ends of the top surface 67 in the second direction X. The first step-like protrusion 70 has a side that becomes part of the first side surface 68, and has a corner that follows the shapes of the nozzle surface 26 (second boundary region 26b), the second boundary surface 43, and the second protective surface 41. More specifically, the first step-like protrusion 70 has a first top surface 72 that follows the second boundary region 26b and a first intersecting surface 73 that follows the second boundary surface 43. A corner is also formed at the intersection of the top surface 67 and the first intersecting surface 73.

[0107] The second step-shaped protrusion 71 has a side surface that becomes part of the second side surface 69, and has a corner that follows the nozzle surface 26 (first boundary region 26a), the first boundary surface 33, and the first protective surface 31. A corner is also formed at the intersection between the top surface 67 and the second step-shaped protrusion 71. More specifically, the second step-shaped protrusion 71 has a second top surface 74 that follows the first boundary region 26a, and a second intersecting surface 75 that follows the first boundary surface 33.

[0108] 21 , the distance L2 between the first step-shaped protrusion 70 and the second step-shaped protrusion 71 in the second direction X (the length of the top surface 67 in the second direction X) may be greater than the length dimension L1 of the first protective surface 31 (second protective surface 41) in the second direction X. In the second boundary cleaning step, the discharge head 23 may reciprocate along the first direction Y with the first top surface 72, the first intersecting surface 73, and the top surface 67 in contact with the second boundary region 26b, the second boundary surface 43, and the second protective surface 41, respectively. However, as in the second modified example, in step S23, the second cleaning unit 60 moves in the −Z direction from the second origin position to the protective surface pressing position.

[0109] In the third modified example, the second wiping member 61 including the first step-shaped protrusion 70 can clean the second boundary area 26b, the second boundary surface 43 and the second protective surface 41 at the same time, so there is no need to perform two-stage cleaning: the second boundary cleaning process and the second protective surface cleaning process.

[0110] In the third modified example, in the first boundary cleaning step of cleaning the vicinity of the first boundary of the first cover member 30, the discharge head 23 may move back and forth along the first direction Y with the second top surface 74, the second intersecting surface 75, and the top surface 67 in contact with the first boundary region 26a, the first boundary surface 33, and the first protective surface 31, respectively. However, similar to the second protective surface cleaning step, in step S50, the second cleaning unit 60 moves in the −Z direction from the second origin position to the protective surface pressing position.

[0111] In the third modified example, the second wiping member 61 including the second step-shaped protrusion 71 can clean the first boundary area 26a, the first boundary surface 33 and the first protective surface 31 at the same time, so there is no need to perform two-stage cleaning: a first boundary cleaning process and a first protective surface cleaning process.

[0112] [Other change examples] The first cleaning unit 50 does not necessarily have to include the first cap 53. The second cleaning unit 60 does not necessarily have to include the second cap 63.

[0113] The second cleaning unit 60 does not necessarily have to include the cleaner 64. In steps S23 and S27, the second cleaning unit 60 moves to the same nozzle face pressing position in the -Z direction, but the second cleaning unit 60 moves to a different position in step S27 than in step S23, for example, the protective surface pressing position. Similarly, the second cleaning unit 60 moves to the same nozzle face pressing position in steps S46 and S50, but the second cleaning unit 60 moves to a different position in the -Z direction in step S50 than in step S46, for example, the protective surface pressing position.

[0114] The first direction Y does not have to be the width direction of the medium 10, but may be, for example, the transport direction of the medium 10 or the printing direction. The second direction X does not have to be the printing direction, but may be, for example, the transport direction of the medium 10 or the width direction of the medium 10.

[0115] The ejection direction does not have to be downward, but may be, for example, obliquely downward. The printing device 11 may be a liquid ejection device that ejects liquids other than ink. The state of the liquid ejected as minute droplets from the liquid ejection device includes granular, teardrop-like, and string-like tails. The liquid referred to here may be any material that can be ejected from the liquid ejection device. For example, the liquid may be any state in which a substance is in its liquid phase, including fluids such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and metal melts. The liquid includes not only liquids as a single state of matter, but also particles of functional materials, such as solid pigments and metal particles, dissolved, dispersed, or mixed in a solvent. Representative examples of liquids include inks and liquid crystals, as described in the above embodiments. Here, ink encompasses various liquid compositions, such as general water-based inks and oil-based inks, as well as gel inks and hot-melt inks. Specific examples of liquid ejection devices include devices that eject liquids containing dispersed or dissolved materials such as electrode materials and color materials used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters. The liquid ejection device may be a device that ejects bioorganic materials used in biochip manufacture, a device used as a precision pipette to eject sample liquids, a textile printing device, a microdispenser, or the like. The liquid ejection device may be a device that ejects lubricating oil with pinpoint accuracy onto precision machinery such as watches and cameras, or a device that ejects transparent resin liquids such as ultraviolet-curing resins onto substrates to form micro-hemispherical lenses, optical lenses, and the like used in optical communication elements. The liquid ejection device may also be a device that ejects etching liquids such as acids or alkalis to etch substrates, etc.

[0116] The technical concepts and effects that can be understood from the above-described embodiment and modified examples will be described below. 1) A method for cleaning a discharge head of a printing device, the printing device comprising: the discharge head configured to discharge a liquid onto a medium that moves relatively to the discharge head; a first cleaning unit for cleaning the discharge head; and a second cleaning unit for cleaning the discharge head, the discharge head comprising: a head body having a nozzle surface in which a plurality of nozzles that discharge the liquid open, the nozzle surface including a first edge and a second edge, the plurality of nozzles being positioned between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; and a second cover member attached to the head body so as to cover the second edge, the nozzle surface including a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member. the first boundary and the second boundary extend in a first direction, the second cleaning unit has a second wiping member capable of absorbing the liquid and a second holding portion that holds the second wiping member, the first cleaning unit has a first wiping member made of a material that has lower absorbency for the liquid than the second wiping member, and a first holding portion that holds the first wiping member, the cleaning method includes a nozzle surface wiping process in which the first wiping member wipes the first cover member, the nozzle surface, and the second cover member by moving the ejection head and the first cleaning unit relative to each other, and a second cover member cleaning process in which the second wiping member cleans the second cover member by moving the ejection head and the second cleaning unit back and forth relative to each other along the first direction, and the second cover member cleaning process includes a second boundary cleaning process in which the second wiping member cleans an area including the second boundary.

[0117] According to this cleaning method, the discharge head and the second cleaning unit move back and forth relative to each other along the direction in which the second boundary extends, so that the second wiping member can remove dirt adhering to the area including the second boundary, thereby removing dirt adhering to the uneven parts of the discharge head.

[0118] 2) The method for cleaning an ejection head described in 1), wherein the second cover member has a second protective surface protruding from the nozzle surface, and the second cover member cleaning process further includes, after the second boundary cleaning process, a second protective surface cleaning process in which the second wiping member cleans the second protective surface.

[0119] According to this cleaning method, the second wiping member can clean the second protective surface. 3) The method for cleaning an ejection head described in 2), wherein the second protective surface extends in a second direction intersecting the first direction, the second wiping member has a top surface extending in both the first direction and the second direction, the top surface is elastically deformable, and the length dimension of the top surface in the second direction is greater than the length dimension of the second protective surface in the second direction.

[0120] According to this cleaning method, the second protective surface can be cleaned by the top surface that is larger than the second protective surface. 4) The method for cleaning a discharge head described in 1), wherein the second cover member includes a second protective surface protruding from the nozzle face and a second boundary surface extending between the second protective surface and the nozzle face, the second wiping member has a stepped protrusion having a corner shaped to fit the nozzle face, the second boundary surface, and the second protective surface, and in the second boundary cleaning step, the discharge head and the second cleaning unit move back and forth relative to each other along the first direction with the stepped protrusion in contact with the nozzle face, the second boundary surface, and the second protective surface.

[0121] According to this cleaning method, the nozzle surface, the second boundary surface, and the second protective surface can be cleaned at once by the stepped projection. 5) The first cover member includes a first protective surface protruding from the nozzle face and a first boundary surface extending between the first protective surface and the nozzle face, the second cover member includes a second protective surface protruding from the nozzle face and a second boundary surface extending between the second protective surface and the nozzle face, and the second wiping member includes a first stepped protrusion having a corner shaped to fit the nozzle face, the second boundary surface, and the second protective surface, and a second stepped protrusion having a corner shaped to fit the nozzle face, the first boundary surface, and the first protective surface. a step-shaped protrusion, and the second protective surface extends in a second direction intersecting the first direction, the distance between the first step-shaped protrusion and the second step-shaped protrusion in the second direction is greater than a length dimension of the second protective surface in the second direction, and in the second boundary cleaning step, the ejection head and the second cleaning unit move back and forth relative to each other along the first direction with the first step-shaped protrusion in contact with the nozzle surface, the second boundary surface, and the second protective surface.

[0122] According to this cleaning method, the nozzle surface, the second boundary surface, and the second protective surface can be cleaned at once by the first stepped projection. 6) The cleaning method for a discharge head described in any one of 1) to 5), further including, after the second cover member cleaning step, a first cover member cleaning step in which the discharge head and the second cleaning unit move back and forth relative to each other along the first direction, thereby causing the second wiping member to clean the first cover member.

[0123] According to this cleaning method, the second cover member and the first cover member can be cleaned in sequence. 7) The method for cleaning a discharge head described in 2), wherein the first cover member has a first protective surface protruding from the nozzle surface, and the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the discharge head and the second cleaning unit move back and forth relative to each other along the first direction, thereby causing the second wiping member to clean the first cover member, and the first cover member cleaning step includes a first protective surface cleaning step in which the second wiping member cleans the first protective surface, and a first boundary cleaning step in which, after the first protective surface cleaning step, the second wiping member cleans an area including the first boundary.

[0124] According to this cleaning method, the first protective surface and the area including the first boundary can be cleaned in sequence by the second wiping member. 8) The method for cleaning a discharge head described in 3), wherein the first cover member has a first protective surface protruding from the nozzle surface, and a length dimension of the top surface in the second direction is greater than a length dimension of the first protective surface in the second direction, and the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the discharge head and the second cleaning unit move back and forth relatively along the first direction, thereby causing the second wiping member to clean the first cover member, and the first cover member cleaning step includes a first boundary cleaning step in which the second wiping member cleans an area including the first boundary, and a first protective surface cleaning step in which, after the first boundary cleaning step, the second wiping member cleans the first protective surface.

[0125] According to this cleaning method, the first protective surface can be cleaned by the top surface that is larger than the first protective surface. 9) The method for cleaning a discharge head described in 4), wherein the first cover member includes a first protective surface protruding from the nozzle face and a first boundary surface extending between the first protective surface and the nozzle face, and the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the discharge head and the second cleaning unit move back and forth relative to each other along the first direction, thereby causing the second wiping member to clean the first cover member, and the first cover member cleaning step includes a first protective surface cleaning step in which the second wiping member cleans the first protective surface, and a first boundary cleaning step in which, after the first protective surface cleaning step, the second wiping member cleans an area including the first boundary, and in the first boundary cleaning step, the discharge head and the second cleaning unit move back and forth relative to each other along the first direction with the stepped protrusion in contact with the nozzle face and the first boundary surface.

[0126] According to this cleaning method, the nozzle surface and the first boundary surface can be cleaned by the stepped projection. 10) The method for cleaning an ejection head described in 5), wherein the first protective surface extends in a second direction intersecting the first direction, and a distance between the first step-shaped protrusion and the second step-shaped protrusion in the second direction is greater than a length dimension of the first protective surface in the second direction, and the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit move back and forth relative to each other along the first direction, thereby causing the second wiping member to clean the first cover member, and the first cover member cleaning step includes a first boundary cleaning step in which the second wiping member cleans an area including the first boundary, and the first boundary cleaning step includes the ejection head and the second cleaning unit moving back and forth relative to each other along the first direction with the second step-shaped protrusion in contact with the nozzle face and the first boundary surface.

[0127] According to this cleaning method, the nozzle surface and the first boundary surface can be cleaned by the second stepped projection. 11) A method for cleaning an ejection head described in any one of 6) to 10), wherein the ejection head has a sidewall that intersects with the nozzle surface, the first cover member has an outer surface that extends along the sidewall, and the first cover member cleaning process includes an outer surface wiping process in which the second wiping member cleans the outer surface.

[0128] According to this cleaning method, the outer surface can be cleaned by the second wiping member. 12) A method for cleaning an ejection head described in any one of 1) to 11), wherein in the nozzle surface wiping process, the first cleaning unit moves relative to the ejection head so that the first wiping member moves from the first edge toward the second edge.

[0129] According to this cleaning method, the dirt that has accumulated near the second cover member that covers the second edge in the nozzle surface wiping step can be removed in the second boundary cleaning step. 13) The method for cleaning a discharge head according to any one of 1) to 12), wherein in the second cover member cleaning step, the discharge head moves back and forth relative to the second cleaning unit.

[0130] According to this cleaning method, the area including the second boundary can be cleaned by the reciprocating movement of the discharge head. 14) The second cleaning unit has a holder that is detachably attached to the second holding unit, The method for cleaning a discharge head according to any one of 1) to 13), wherein the second wiping member is detachably attached to the holder.

[0131] According to this cleaning method, the second wiping member can be easily replaced. 15) A method for cleaning an ejection head described in any one of 1) to 14), wherein the second cleaning unit has a cleaner for cleaning the first wiping member, the second holding unit holds the second wiping member on a first side and holds the cleaner on a second side opposite the first side, a second direction intersecting with the first direction is a direction along the nozzle surface, a third direction intersecting with both the first direction and the second direction is a direction intersecting with the nozzle surface, and each of the first holding unit and the second holding unit is independently movable back and forth in both the second direction and the third direction, and the cleaning method includes, after the nozzle surface wiping step, a first wiping member cleaning step in which the first holding unit and the second holding unit move relatively along the second direction, thereby causing the cleaner to clean the first wiping member.

[0132] According to this cleaning method, by using the cleaner to clean the first wiping member, it is possible to prevent the dirt removed by the first wiping member from adhering again to the ejection head. [Explanation of symbols]

[0133] 10...medium, 11...printing device, 12...exterior case, 13...conveying device, 14...ejection mechanism, 15...support base, 16...moving mechanism, 17...liquid container, 18...mounting section, 19...operation panel, 20...cleaning unit, 21...inspection mechanism, 22...flushing box, 23...ejection head, 24...head body, 24a...first side wall, 24b...second side wall, 25...nozzle, 26...nozzle surface, 26a...first boundary area, 26b...second boundary area, 27...first edge, 28...second edge, 30...first cover member, 31...first protective surface, 32...outer surface, 33...first boundary surface, 40...second cover member, 41...second protective surface, 42...outer surface, 43 ...second boundary surface, 50...first cleaning unit, 51...first wiping member, 52...first holding unit, 53...first cap, 60...second cleaning unit, 61...second wiping member, 62...second holding unit, 63...second cap, 64...cleaner, 65...elastic body, 66...holder, 67...top surface, 68...first side surface, 69...second side surface, 70...first step-shaped protrusion, 71...second step-shaped protrusion, 72...top surface (second top surface), 73...intersecting surface (second intersecting surface), 74...first top surface, 75...first intersecting surface, 100...controller, 101...processing circuit, 102...memory unit, 103...communication unit, L1...length dimension, L2...distance, X...second direction, Y...first direction, Z...third direction.

Claims

1. A method for cleaning an ejection head of a printing device, the printing device comprising: the ejection head configured to eject liquid onto a medium that moves relative to the ejection head; a first cleaning unit for cleaning the ejection head; a second cleaning unit for cleaning the ejection head; Equipped with the ejection head is a head body having a nozzle surface in which a plurality of nozzles for ejecting the liquid are opened, the nozzle surface including a first edge and a second edge, and the plurality of nozzles are located between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; a second cover member attached to the head body so as to cover the second edge, the nozzle surface includes a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member, the first boundary and the second boundary extend in a first direction; The second cleaning unit is a second wiping member capable of absorbing the liquid; a second holding portion that holds the second wiping member, The first cleaning unit is a first wiping member made of a material that is less absorbent of the liquid than the second wiping member; a first holding portion that holds the first wiping member, the second cover member has a second protection surface that protrudes from the nozzle surface, The cleaning method comprises: a nozzle surface wiping step in which the ejection head and the first cleaning unit move relative to each other, causing the first wiping member to wipe the first cover member, the nozzle surface, and the second cover member; a second cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, causing the second wiping member to clean the second cover member; The second cover member cleaning step includes: a second boundary cleaning step in which the second wiping member cleans an area including the second boundary; a second protective surface cleaning step of cleaning the second protective surface with the second wiping member after the second boundary cleaning step.

2. the second protection surface extends in a second direction intersecting the first direction, the second wiping member has a top surface extending in both the first direction and the second direction, The top surface is elastically deformable, a length dimension of the top surface in the second direction being greater than a length dimension of the second protective surface in the second direction; The method for cleaning a discharge head according to claim 1 .

3. A method for cleaning an ejection head of a printing device, the printing device comprising: the ejection head configured to eject liquid onto a medium that moves relative to the ejection head; a first cleaning unit for cleaning the ejection head; a second cleaning unit for cleaning the ejection head; Equipped with the ejection head is a head body having a nozzle surface in which a plurality of nozzles for ejecting the liquid are opened, the nozzle surface including a first edge and a second edge, and the plurality of nozzles are located between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; a second cover member attached to the head body so as to cover the second edge, the nozzle surface includes a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member, the first boundary and the second boundary extend in a first direction; The second cleaning unit is a second wiping member capable of absorbing the liquid; a second holding portion that holds the second wiping member, The first cleaning unit is a first wiping member made of a material that is less absorbent of the liquid than the second wiping member; a first holding portion that holds the first wiping member, the second cover member includes a second protective surface protruding from the nozzle surface and a second boundary surface extending between the second protective surface and the nozzle surface, the second wiping member has a stepped protrusion having a corner shaped to fit the nozzle surface, the second boundary surface, and the second protection surface; The cleaning method comprises: a nozzle surface wiping step in which the ejection head and the first cleaning unit move relative to each other, causing the first wiping member to wipe the first cover member, the nozzle surface, and the second cover member; a second cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, causing the second wiping member to clean the second cover member; the second cover member cleaning step includes a second boundary cleaning step in which the second wiping member cleans an area including the second boundary, A method for cleaning an ejection head, characterized in that in the second boundary cleaning process, the ejection head and the second cleaning unit move back and forth relative to each other along the first direction while the stepped protrusion is in contact with the nozzle surface, the second boundary surface, and the second protective surface.

4. A method for cleaning an ejection head of a printing device, the printing device comprising: the ejection head configured to eject liquid onto a medium that moves relative to the ejection head; a first cleaning unit for cleaning the ejection head; a second cleaning unit for cleaning the ejection head; Equipped with the ejection head is a head body having a nozzle surface in which a plurality of nozzles for ejecting the liquid are opened, the nozzle surface including a first edge and a second edge, and the plurality of nozzles are located between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; a second cover member attached to the head body so as to cover the second edge, the nozzle surface includes a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member, the first boundary and the second boundary extend in a first direction; The second cleaning unit is a second wiping member capable of absorbing the liquid; a second holding portion that holds the second wiping member, The first cleaning unit is a first wiping member made of a material that is less absorbent of the liquid than the second wiping member; a first holding portion that holds the first wiping member, the first cover member includes a first protective surface protruding from the nozzle surface and a first boundary surface extending between the first protective surface and the nozzle surface; the second cover member includes a second protective surface protruding from the nozzle surface and a second boundary surface extending between the second protective surface and the nozzle surface, The second wiping member is a first stepped protrusion having a corner shaped to conform to the nozzle surface, the second boundary surface, and the second protective surface; a second step-shaped protrusion having a corner shaped to conform to the nozzle surface, the first boundary surface, and the first protection surface, the second protection surface extends in a second direction intersecting the first direction, a distance between the first stepped protrusion and the second stepped protrusion in the second direction is greater than a length dimension of the second protective surface in the second direction; The cleaning method comprises: a nozzle surface wiping step in which the ejection head and the first cleaning unit move relative to each other, causing the first wiping member to wipe the first cover member, the nozzle surface, and the second cover member; a second cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, causing the second wiping member to clean the second cover member; the second cover member cleaning step includes a second boundary cleaning step in which the second wiping member cleans an area including the second boundary, a second boundary cleaning step in which the ejection head and the second cleaning unit move back and forth relative to each other along the first direction with the first step-shaped protrusion in contact with the nozzle surface, the second boundary surface, and the second protective surface;

5. The cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, thereby causing the second wiping member to clean the first cover member. The method for cleaning the ejection head according to any one of claims 1 to 4.

6. A method for cleaning an ejection head of a printing device, the printing device comprising: the ejection head configured to eject liquid onto a medium that moves relative to the ejection head; a first cleaning unit for cleaning the ejection head; a second cleaning unit for cleaning the ejection head; Equipped with the ejection head is a head body having a nozzle surface in which a plurality of nozzles for ejecting the liquid are opened, the nozzle surface including a first edge and a second edge, and the plurality of nozzles are located between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; a second cover member attached to the head body so as to cover the second edge, the nozzle surface includes a first boundary that is a boundary with the first cover member and a second boundary that is a boundary with the second cover member, the first boundary and the second boundary extend in a first direction; The second cleaning unit is a second wiping member capable of absorbing the liquid; a second holding portion that holds the second wiping member, The first cleaning unit is a first wiping member made of a material that is less absorbent of the liquid than the second wiping member; a first holding portion that holds the first wiping member, The cleaning method comprises: a nozzle surface wiping step in which the ejection head and the first cleaning unit move relative to each other, causing the first wiping member to wipe the first cover member, the nozzle surface, and the second cover member; a second cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, causing the second wiping member to clean the second cover member; a first cover member cleaning step in which, after the second cover member cleaning step, the ejection head and the second cleaning unit move back and forth relative to each other along the first direction, thereby causing the second wiping member to clean the first cover member, The method for cleaning an ejection head, wherein the second cover member cleaning step includes a second boundary cleaning step in which the second wiping member cleans an area including the second boundary.

7. the first cover member has a first protection surface that protrudes from the nozzle surface, the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, thereby causing the second wiping member to clean the first cover member; The first cover member cleaning step includes: a first protective surface cleaning step in which the second wiping member cleans the first protective surface; and a first boundary cleaning step in which the second wiping member cleans an area including the first boundary after the first protective surface cleaning step. The method for cleaning a discharge head according to claim 1 .

8. the first cover member has a first protection surface that protrudes from the nozzle surface, a length dimension of the top surface in the second direction is greater than a length dimension of the first protective surface in the second direction; the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, thereby causing the second wiping member to clean the first cover member; The first cover member cleaning step includes: a first boundary cleaning step in which the second wiping member cleans an area including the first boundary; and a first protective surface cleaning step in which the second wiping member cleans the first protective surface after the first boundary cleaning step. The method for cleaning a discharge head according to claim 2.

9. the first cover member includes a first protective surface protruding from the nozzle surface and a first boundary surface extending between the first protective surface and the nozzle surface; the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, thereby causing the second wiping member to clean the first cover member; The first cover member cleaning step includes: a first protective surface cleaning step in which the second wiping member cleans the first protective surface; a first boundary cleaning step in which, after the first protective surface cleaning step, the second wiping member cleans an area including the first boundary, In the first boundary cleaning step, the ejection head and the second cleaning unit relatively reciprocate along the first direction with the stepped protrusion in contact with the nozzle surface and the first boundary surface. The method for cleaning a discharge head according to claim 3.

10. the first protective surface extends in a second direction intersecting the first direction, a distance between the first stepped protrusion and the second stepped protrusion in the second direction is greater than a length dimension of the first protective surface in the second direction; the cleaning method further includes, after the second cover member cleaning step, a first cover member cleaning step in which the ejection head and the second cleaning unit relatively reciprocate along the first direction, thereby causing the second wiping member to clean the first cover member; the first cover member cleaning step includes a first boundary cleaning step in which the second wiping member cleans an area including the first boundary, the first boundary cleaning step includes relatively reciprocating movement of the ejection head and the second cleaning unit along the first direction in a state in which the second stepped protrusion is in contact with the nozzle surface and the first boundary surface. The method for cleaning a discharge head according to claim 4.

11. the ejection head has a sidewall that intersects with the nozzle surface, the first cover member has an outer surface extending along the side wall, The first cover member cleaning step includes an outer surface wiping step in which the second wiping member cleans the outer surface. The method for cleaning a discharge head according to any one of claims 5 to 10.

12. In the nozzle surface wiping step, the first cleaning unit moves relative to the ejection head so that the first wiping member moves from the first edge toward the second edge. The method for cleaning the ejection head according to any one of claims 1 to 11.

13. In the second cover member cleaning step, the ejection head reciprocates relative to the second cleaning unit. The method for cleaning a discharge head according to any one of claims 1 to 12.

14. the second cleaning unit has a holder that is detachably attached to the second holding unit, The second wiping member is detachably attached to the holder. The method for cleaning a discharge head according to any one of claims 1 to 13.

15. the second cleaning unit has a cleaner for cleaning the first wiping member, the second holding portion holds the second wiping member on a first side and holds the cleaner on a second side opposite to the first side, a second direction intersecting the first direction is a direction along the nozzle surface, a third direction intersecting both the first direction and the second direction is a direction intersecting the nozzle surface, the first holding portion and the second holding portion are each independently reciprocatable in both the second direction and the third direction, the cleaning method further includes, after the nozzle surface wiping step, a first wiping member cleaning step in which the first holding portion and the second holding portion move relatively along the second direction, thereby causing the cleaner to clean the first wiping member. The method for cleaning the ejection head according to any one of claims 1 to 14.

16. A method for cleaning a discharge head of a printing device, comprising: The ejection head ejects liquid onto a medium that moves relatively to the ejection head. The ejection head configured as above, a first cleaning unit for cleaning the ejection head; a second cleaning unit for cleaning the ejection head; Equipped with The ejection head has a nozzle surface on which a plurality of nozzles for ejecting the liquid are opened. a nozzle body, the nozzle face including a first edge and a second edge, the plurality of nozzles being a head body located between the first edge and the second edge; a first cover member attached to the head body so as to cover the first edge; a second cover member attached to the head body so as to cover the second edge; death, The nozzle surface has a first boundary which is a boundary with the first cover member and a second boundary which is a boundary with the second cover member. and a second boundary which is a boundary with the first boundary and the second boundary extend in a first direction; The second cleaning unit is a second wiping member capable of absorbing the liquid; a second holding portion that holds the second wiping member, The first cleaning unit is a first wiping member made of a material that is less absorbent of the liquid than the second wiping member; a first holding portion that holds the first wiping member, the second cleaning unit has a cleaner for cleaning the first wiping member, the second holding portion holds the second wiping member on a first side and holds the cleaner on a second side opposite to the first side, a second direction intersecting the first direction is a direction along the nozzle surface, a third direction intersecting both the first direction and the second direction is a direction intersecting the nozzle surface, the first holding portion and the second holding portion are each independently reciprocatable in both the second direction and the third direction, The cleaning method comprises: The ejection head and the first cleaning unit move relative to each other, whereby the first wiping member a nozzle surface wiping step of wiping the first cover member, the nozzle surface, and the second cover member; and, a first wiping member cleaning step in which, after the nozzle surface wiping step, the first holding portion and the second holding portion move relatively along the second direction, thereby causing the cleaner to clean the first wiping member; The ejection head and the second cleaning unit move back and forth relative to each other along the first direction. a second cover member cleaning step in which the second wiping member cleans the second cover member by Including, The second cover member cleaning step includes cleaning an area including the second boundary with the second wiping member. a second boundary cleaning step of cleaning the ejection head;

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