Capping Device

Abstract

To provide a capping device that can prevent cleaning liquid from a cleaning roller from scattering.SOLUTION: The capping device comprises: first-fourth cap parts 21-24 that seal ejection ports of first-fourth heads 11-14 having the ejection ports for ejecting ink; and a first guide rail 26 and a second guide rail 27 that guide cleaning rollers for cleaning the first-fourth cap parts 21-24 while supporting the rollers and have inclinations with respect to length directions of the first-fourth cap parts 21-24.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a capping device having a cap portion that seals a discharge port of a discharge portion that discharges liquid. [Background technology]

[0002] 2. Description of the Related Art Inkjet printing devices have been proposed that perform printing by ejecting ink from an inkjet head onto a print medium such as paper or film.

[0003] For example, Patent Document 1 proposes an inkjet printing device that includes a cap portion that seals the ink ejection ports of the inkjet head.

[0004] The cap unit of the inkjet printing device seals the ink ejection ports of the inkjet head during standby when no printing process is being performed, thereby preventing the ink ejection ports of the inkjet head from drying out and solidifying. The cap unit also receives and discharges ink ejected by a so-called purge during a cleaning operation of the inkjet head. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-149461 A Summary of the Invention [Problem to be solved by the invention]

[0006] Here, if solidified ink or dust adheres to the cap portion, the sealing ability decreases and it becomes difficult to discharge the ink received during purging, so regular cleaning is necessary.

[0007] One method for cleaning the cap portion is to apply a cleaning liquid to a cleaning roller made of a sponge, for example, and then move and rotate the cleaning roller along the cap portion to clean it.

[0008] However, in such a cleaning method using a cleaning roller, if an excessive amount of cleaning liquid is applied to the cleaning roller, the cleaning liquid applied to the cleaning roller may splash onto the surrounding area, causing soiling.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a capping device capable of preventing the scattering of cleaning liquid from the cleaning roller. [Means for solving the problem]

[0010] The capping device of the present invention comprises a cap portion that seals the outlet of a discharge portion having an outlet for discharging liquid, and a guide rail that supports and guides a cleaning roller that cleans the cap portion and is inclined with respect to the longitudinal direction of the cap portion. Effect of the Invention

[0011] According to the capping device of the present invention, the cleaning roller that cleans the cap part is supported and guided by a guide rail that is inclined with respect to the length direction of the cap part, so that by moving and rotating the cleaning roller along the above-mentioned guide rail, a force can be applied from the cap part to the cleaning roller, thereby squeezing the cleaning roller. Therefore, the cleaning liquid applied in excess to the cleaning roller can be dropped down, and the scattering of the cleaning liquid from the cleaning roller can be prevented. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an inkjet printing apparatus using an embodiment of a capping device of the present invention; [Diagram 2]A view of the inkjet printing device shown in Figure 1 from the direction of arrow A. [Diagram 3] FIG. 1 is a diagram showing a schematic configuration of an example of a head unit; [Figure 4] FIG. 2 is a perspective view showing a schematic configuration of a capping unit; [Diagram 5] Top view of the capping unit shown in Figure 4 [Figure 6] FIG. 2 is a diagram showing a schematic configuration of an example of a cap portion; [Figure 7] FIG. 1 is a diagram showing an example of a cleaning roller; [Figure 8] Front view of the capping unit shown in Figure 4 [Figure 9] FIG. 1 is a diagram for explaining a moving path of a cleaning roller; [Figure 10] Diagram showing examples of other shapes of guide rails [Figure 11] A block diagram showing the configuration of a control system of an inkjet printing apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An inkjet printing apparatus using an embodiment of the capping device of the present invention will be described in detail below with reference to the drawings. The inkjet printing apparatus of this embodiment is characterized by the configuration of a capping unit that corresponds to the capping device of the present invention, but first, the configuration of the entire inkjet printing apparatus will be described. FIG. 1 is a schematic diagram of an inkjet printing apparatus 1 of this embodiment. FIG. 2 is a view of the inkjet printing apparatus 1 shown in FIG. 1 as viewed from the direction of arrow A. In the following description of the embodiment, the up, down, left, right, front, back, and rear indicated by arrows in FIG. 1 are defined as the up, down, left, right, front, and rear directions of the inkjet printing apparatus 1.

[0014] As shown in FIG. 1, the inkjet printing apparatus 1 of this embodiment includes a base 2, a foot stand 3, a platen 4, a rail section 5, a head unit 10, and a capping unit 20.

[0015] The bases 2 are columnar members extending in the front-rear direction and arranged in parallel with a gap in the left-right direction. Two wheels 2a are provided on the bottom surface of each of the two bases 2.

[0016] A foot stand 3 is provided upright on each base 2. A platen 4 is supported on the upper surfaces of the two foot stands 3 facing each other.

[0017] An arc-shaped front paper guide 4a and a rear paper guide 4b extend from the front and rear of the platen 4. Also, as shown in Fig. 2, a vacuum chamber 4c in which a fan 4d is installed is provided below the platen 4. Note that the vacuum chamber 4c is not shown in Fig. 1.

[0018] When the fan 4d in the vacuum chamber 4c rotates, a negative pressure is created inside the vacuum chamber 4c, and a suction force is generated in the suction holes (not shown) formed in the platen 4. The printing paper P is attracted to the platen 4 by the suction force generated in the suction holes of the platen 4.

[0019] 2, a drive roller 6 and a pressure roller 7 are provided behind the platen 4 so as to face each other. Note that the drive roller 6 and the pressure roller 7 are omitted from FIG.

[0020] The drive roller 6 is an elongated roller extending in the extension direction of the platen 4, and is rotated by a transport drive motor 61 (see FIG. 11) which will be described later.

[0021] The pressure roller 7, like the drive roller 6, is an elongated roller extending in the extension direction of the platen 4, and is supported by a lifting mechanism (not shown) so as to be movable up and down.

[0022] Then, the printing paper P on the rear paper guide 4b is clamped between the drive roller 6 and the pressure roller 7, and as the drive roller 6 rotates with the printing paper P pressed by the pressure roller 7, the printing paper P is sent forward.

[0023] A take-up core holder 8 is provided on the front side of the base 2 of the inkjet printing device 1, which detachably holds a core 8a that takes up the printing paper P. The take-up core holder 8 is connected to a take-up drive motor 81 (see FIG. 11) via a torque limiter (not shown), and is configured so that the take-up core holder 8 is rotated by the take-up drive motor 81.

[0024] Further, a supply-side core holding section 9 is provided on the rear side of the base 2 of the inkjet printing device 1, which detachably holds a core 9a of roll paper on which printing paper P is wound in a roll shape. The supply-side core holding section 9 is linked to a supply drive motor 91 (see FIG. 11) via a torque limiter (not shown), and is configured so that the supply-side core holding section 9 is rotated by the supply drive motor 91.

[0025] As shown in Figure 2, the roll paper (printing paper P) held by the supply side core holding section 9 is pulled out and passed through the rear paper guide 4b, between the drive roller 6 and the pressure roller 7, over the platen 4, and the front paper guide 4a, before being wound onto the core 8a held by the winding side core holding section 8.

[0026] A rail section 5 is installed via a support member (not shown) on the upper part of the two legs 3. The rail section 5 includes a rail (not shown) extending in the left-right direction and a main scanning drive motor 54 (see FIG. 11) that moves the head unit 10 back and forth in the left-right direction on the rail.

[0027] Further, a capping unit 20 is provided at one end of the rail portion 5. The head unit 10 is placed in the capping unit 20, whereby the head unit 10 is capped by the capping unit 20. In this embodiment, the capping unit 20 includes a configuration corresponding to the capping device of the present invention.

[0028] Fig. 3 is a diagram showing a schematic configuration of the head unit 10. As shown in Fig. 3, the head unit 10 of this embodiment is provided with five heads, namely a first head 11 to a fifth head 15. The second head 12, the third head 13 and the fourth head 14 are inkjet heads having a plurality of nozzles that eject ink of different colors, for example, C (cyan), M (magenta) and Y (yellow) inks.

[0029] The fifth head 15 has a similar configuration to the second head 12 to the fourth head 14, but ejects a pretreatment liquid instead of ink. The pretreatment liquid is a liquid that is applied for pretreatment before ink is ejected onto the printing paper P to perform printing processing. As the pretreatment liquid, for example, a liquid for improving the color development and uniform application of the ink is used, but a pretreatment liquid that is already known can be used.

[0030] The first head 11 is an inkjet head that ejects ink in the same manner as the second to fourth heads 12 to 14. For example, when printing a pattern on a black base, the first head 11 ejects white ink onto the black base so that the black color of the base does not show through.

[0031] As shown in FIG. 3, the first to fifth heads 11 to 15 are arranged side by side in the movement direction (left and right direction) of the head unit 10, but the first head 11 and the second to fourth heads 12 to 14 are staggered, and the fifth head 15 and the second to fourth heads 12 to 14 are also staggered.

[0032] That is, the second to fourth heads 12 to 14 and the first and fifth heads 11, 15 are disposed at different positions in a direction (front-to-back direction) perpendicular to the movement direction of the head unit 10. The first head 11 and the fifth head 15 are disposed at the same position in a direction (front-to-back direction) perpendicular to the movement direction of the head unit 10. The second to fourth heads 12 to 14 are disposed at the same position in a direction (front-to-back direction) perpendicular to the movement direction of the head unit 10.

[0033] Next, the capping unit 20 of this embodiment will be described. Fig. 4 is a perspective view showing a schematic configuration of the capping unit 20 of this embodiment. Fig. 5 is a top view of the capping unit 20 shown in Fig. 4.

[0034] The capping unit 20 seals the ejection surfaces (ejection openings) of the first to fifth heads 11 to 15 to prevent the ejection surfaces (ejection openings) of the first to fifth heads 11 to 15 from drying out while the inkjet printing device 1 is on standby and not performing a printing process. The ejection surfaces of the first to fifth heads 11 to 15 are surfaces on which the ejection openings of the nozzles that eject ink or pretreatment liquid are arranged.

[0035] The capping unit 20 specifically includes first to fifth cap parts 21 to 25.

[0036] The first to fifth cap parts 21 to 25 are cap parts corresponding to the first to fifth heads 11 to 15, and are provided on the housing 20a at positions corresponding to the first to fifth heads 11 to 15.

[0037] FIG. 6 is a diagram showing the configuration of the first cap portion 21, but the second to fifth cap portions 22 to 25 also have the same configurations and functions as the first cap portion 21.

[0038] 6, the first cap portion 21 includes a base 21a and a capping member 21b formed on the base 21a. The capping member 21b includes a bottom portion 21c and a peripheral wall 21d standing on the peripheral edge of the bottom portion 21c. Two discharge holes 21e are formed in the bottom portion 21c.

[0039] The length of the capping member 21b in the front-rear direction is equal to the length of the first head 11 in the front-rear direction. A peripheral wall 21d of the capping member 21b is formed from a resin such as rubber, and abuts against and adheres closely to the first head 11 to seal the ejection surface of the first head 11.

[0040] Furthermore, when the first head 11 is purged, the liquid discharged from the first head 11 is received by the capping member 21b and discharged from the discharge hole 21e formed in the bottom portion 21c.

[0041] A discharge path and a suction pump, etc. are provided within the housing 20a, and the ink or pretreatment liquid discharged into the first to fifth cap portions 21 to 25 is sucked up by the suction pump and discharged via the discharge path to a waste liquid tank not shown.

[0042] Here, as described above, if solidified ink, dust, or the like adheres to the first to fifth cap portions 21 to 25, the sealing ability decreases and it becomes difficult to discharge ink, etc. from the discharge hole 21e, so regular cleaning is necessary.

[0043] Therefore, in this embodiment, a user uses a cleaning roller 30 as shown in Fig. 7A and a cleaning roller 31 as shown in Fig. 7B to clean the first to fifth cap parts 21 to 25. Specifically, the cleaning roller 30 is used as a tool for cleaning the first to fourth cap parts 21 to 24 corresponding to the first to fourth heads 11 to 14 that eject ink, and the cleaning roller 31 is used as a tool for cleaning the fifth cap part 25 corresponding to the fifth head 15 that ejects a pretreatment liquid.

[0044] As shown in Fig. 7A, the cleaning roller 30 is made of a cylindrical sponge and includes a sponge part 30a with a roller shaft As disposed at its center, and a handle part 30b connected to the roller shaft As of the sponge part 30a. As shown in Fig. 7B, the cleaning roller 31 is made of a cylindrical sponge and includes a sponge part 31a with a roller shaft As disposed at its center, and a handle part 31b connected to the roller shaft As of the sponge part 31a.

[0045] 7A and 7B, the cleaning roller 30 and the cleaning roller 31 have different lengths in the roller axial direction, and the cleaning roller 30 has a length that allows it to simultaneously clean the first to fourth cap parts 21 to 24, while the cleaning roller 31 has a length that allows it to simultaneously clean the fifth cap part 25. In this way, by performing cleaning using the two types of cleaning rollers 30 and 31, it is possible to prevent the ink and the pretreatment liquid from mixing in the first to fifth cap parts 21 to 25 and causing the ink to solidify.

[0046] Moreover, first to fourth guide rails 26 to 29 for guiding the above-mentioned cleaning rollers 30, 31 are provided on the housing 20a of the capping unit 20 of this embodiment.

[0047] As shown in Figures 4 and 5, the first guide rail 26 and the second guide rail 27 are provided on both sides of the first to fourth cap parts 21 to 24 and extend in the longitudinal direction (front-to-back direction) of the first to fourth cap parts 21 to 24.

[0048] The first guide rail 26 and the second guide rail 27 are formed in an S-shape over the length in the front-rear direction of both the first cap part 21 and the second to fourth cap parts 22 to 24, which are disposed at different positions in the front-rear direction. Specifically, the first guide rail 26 and the second guide rail 27 are formed in a curve having a curvature that convex to the left in the range on both sides of the left and right direction of the first cap part 21, and are formed in a curve having a curvature that convex to the right in the range on both sides of the left and right direction of the second to fourth cap parts 22 to 24. The first guide rail 26 and the second guide rail 27 are formed in an S-shape as described above, so that they are inclined with respect to the length direction (front-rear direction) of the first to fifth cap parts 21 to 25. In this embodiment, the length direction of the first to fifth cap parts 21 to 25 is the arrangement direction of the nozzles in the first to fifth heads 11 to 15 along the transport direction of the printing paper P.

[0049] 8 is a view of the capping unit 20 shown in Fig. 4 as seen from the front side. As shown in Fig. 8, the first guide rail 26 and the second guide rail 27 are formed of a wall portion W that is erected vertically with respect to the upper surface of the housing 20a, and a horizontal portion H that perpendicularly intersects with the upper end portion of the wall portion W and extends horizontally toward the first to fourth cap portions 21 to 24. That is, the first guide rail 26 and the second guide rail 27 are formed to have an L-shaped cross section.

[0050] The wall portion W is formed higher than the height of the first to fourth cap portions 21-24, and is formed at a height that allows the ends E1, E2 of the roller shaft As of the cleaning roller 30 to be inserted between the horizontal portion H and the upper surfaces of the first to fourth cap portions 21-24. The horizontal portion H has a width sufficient to restrict the vertical movement of the ends E1, E2 of the roller shaft As of the cleaning roller 30, but is formed with a width that does not prevent the first to fourth cap portions 21-24 from coming into close contact with the first to fourth heads 11-14.

[0051] In this way, by forming the first guide rail 26 and the second guide rail 27 with an L-shaped cross section, as will be described in detail later, the horizontal portion H can regulate the vertical position of the roller axis As of the cleaning roller 30, and the thickness of the wall portion W can be made thin, so that the first guide rail 26 and the second guide rail 27 can be provided even in a narrow space.

[0052] When cleaning the first to fourth cap parts 21-24, both ends of the cleaning roller 30 are placed with respect to the first guide rail 26 and the second guide rail 27. At this time, it is preferable that one end E1 of the roller shaft As of the cleaning roller 30 is placed on the lower surface side of the horizontal part H of the first guide rail 26, and the other end E2 is placed on the lower surface side of the horizontal part H of the second guide rail 27, as shown in FIG.

[0053] By arranging both ends E1, E2 of the roller shaft As of the cleaning roller 30 in this manner, the position of the roller shaft As of the cleaning roller 30 can be regulated by the first and second guide rails 26, 27. This makes it easier to push the cleaning roller 30 along the first and second guide rails 26, 27.

[0054] Furthermore, when cleaning the first to fourth cap parts 21 to 24, as shown in FIG. 9, the cleaning roller 30 is installed so that the extension direction of the roller axis As is perpendicular to the length direction of the first to fourth cap parts 21 to 24 (left-right direction), and the cleaning roller 30 is moved and rotated while maintaining the extension direction of the roller axis As in that state.

[0055] 9, the cleaning roller 30 is pushed along the first and second guide rails 26, 27 so that the center of the roller axis As forms an S-shape. The cleaning roller 30 may be reciprocated in the front-rear direction.

[0056] By pushing the cleaning roller 30 forward in this manner, the peripheral wall 21d extending in the front-rear direction of the capping member 21b of the first to fourth cap parts 21 to 24 is pressed against the cleaning roller 30, whereby a force in the left-right direction (a direction perpendicular to the length direction of the first to fourth cap parts 21 to 24) acts on the sponge part 30a of the cleaning roller 30. The action of this force can squeeze the sponge part 30a of the cleaning roller 30, so that the cleaning liquid absorbed in excess by the sponge part 30a of the cleaning roller 30 can drop downward, preventing it from splashing around.

[0057] In addition, as the cleaning roller 30 moves and rotates, the contact areas between the first to fourth cap parts 21 to 24 and the sponge part 30a change, so that the first to fourth cap parts 21 to 24 can be wiped with clean parts of the sponge part 30a.

[0058] In addition, in the above embodiment, the first guide rail 26 and the second guide rail 27 are formed to have a curved shape, so that the cleaning roller 30 can move smoothly and the cleaning work can be performed more quickly.

[0059] Furthermore, in the above embodiment, the first guide rail 26 and the second guide rail 27 are formed in an S-shape, so that even if the cap parts are arranged at different positions in the front-to-rear direction, the cleaning roller 30 can be moved smoothly, and cleaning work can be performed more quickly.

[0060] In the above description, the first guide rail 26 and the second guide rail 27 have been described, but the third guide rail 28 and the fourth guide rail 29 also have the same shape and structure. However, since the third guide rail 28 and the fourth guide rail 29 guide the cleaning roller 31 shown in FIG. 7B, the distance between them is narrower than the distance between the first guide rail 26 and the second guide rail 27.

[0061] In this way, by making the distance between the first guide rail 26 and the second guide rail 27 and the distance between the third guide rail 28 and the fourth guide rail 29 different, it is possible to prevent the cleaning roller 30 used when cleaning the first to fourth cap parts 21 to 24 from being mistakenly used when cleaning the fifth cap part 25. Conversely, it is possible to prevent the cleaning roller 31 used when cleaning the fifth cap part 25 from being mistakenly used when cleaning the first to fourth cap parts 21 to 24. This makes it possible to prevent the ink and the pretreatment liquid from mixing and solidifying in the first to fifth cap parts 21 to 25.

[0062] As shown in Figures 4 and 5, the third guide rail 28 and the fourth guide rail 29 are provided on both sides of the fifth cap part 25 and extend in the length direction (front-to-back direction) of the fifth cap part 25.

[0063] The third guide rail 28 and the fourth guide rail 29 are formed in an S-shape and have the same length as the first guide rail 26 and the second guide rail 27. The third guide rail 28 and the fourth guide rail 29 are formed in a curve having a curvature that convexly extends to the left side in the range on both sides of the fifth cap part 25. The third guide rail 28 and the fourth guide rail 29 are formed in an S-shape as described above, and thus are formed to have an inclination with respect to the length direction (front-rear direction) of the fifth cap part 25.

[0064] As shown in FIG. 8, the third guide rail 28 and the fourth guide rail 29 are also formed to have an L-shaped cross section.

[0065] When cleaning the fifth cap portion 25, both ends E1, E2 of the cleaning roller 31 are placed with respect to the third guide rail 28 and the fourth guide rail 29. In this case, it is preferable that one end E1 of the roller shaft As of the cleaning roller 31 is placed on the lower surface side of the horizontal portion H of the third guide rail 28, and the other end E2 is placed on the lower surface side of the horizontal portion H of the fourth guide rail 29.

[0066] Then, similarly to when cleaning the first to fourth cap parts 21 to 24, the cleaning roller 31 is installed so that the extension direction of the roller axis As is perpendicular to the longitudinal direction of the fifth cap part 25 (left-right direction), and the cleaning roller 31 is moved and rotated while maintaining the extension direction of the roller axis As in that state.

[0067] As a result, the cleaning roller 31 is pushed forward in the front-rear direction along the third and fourth guide rails 28, 29 so that the center of the roller axis As forms an S-shape. The cleaning roller 31 may be reciprocated in the front-rear direction.

[0068] By pushing the cleaning roller 31 forward in this manner, the fifth cap portion 25 can apply a force in the left-right direction to the sponge portion 31a of the cleaning roller 31. This allows the sponge portion 31a of the cleaning roller 31 to be squeezed, allowing the cleaning liquid absorbed in excess by the sponge portion 31a of the cleaning roller 31 to fall downward, preventing it from splashing around.

[0069] Furthermore, as the cleaning roller 31 moves and rotates, the contact portion between the fifth cap portion 25 and the sponge portion 31a changes, so that the fifth cap portion 25 can be wiped with a clean portion of the sponge portion 31a.

[0070] In this embodiment, the first to fourth guide rails 26-29 are formed in an S-shape, but this is not limited thereto. For example, the first to fourth guide rails 26-29 may be formed in a V-shape as shown in FIG. 10, so that the first to fourth guide rails 26-29 are inclined relative to the longitudinal direction of the first cap portion 21-fifth cap portion 25.

[0071] Next, Fig. 11 is a block diagram showing the configuration of a control system of the inkjet printing apparatus 1 of this embodiment. The inkjet printing apparatus 1 operates each of the controlled units shown in Fig. 11 in response to a control signal from a print control device 16. In this embodiment, the print control device 16 corresponds to the control unit of the present invention.

[0072] The print control device 16 and the inkjet printing device 1 are connected by a communication line such as a LAN (Local Area Network) or an Internet line, and are configured to be able to communicate with each other. The communication line may be wired or wireless.

[0073] The print control device 16 is composed of a computer equipped with a CPU (Central Processing Unit), a semiconductor memory, a hard disk, etc. The print control device 16 executes a print control program stored in advance in a storage medium such as a semiconductor memory or a hard disk based on an input print job, etc., and controls each part shown in FIG. 11 by operating an electric circuit.

[0074] Next, a printing operation of the inkjet printing apparatus 1 of this embodiment will be described. Note that, here, a case will be described in which the first head 11 is not used, and the pretreatment liquid is ejected from the fifth head 15 to apply it to the printing paper P, and then ink is ejected from the second to fourth heads 12 to 14 to print on the printing paper P to which the pretreatment liquid has been applied.

[0075] First, as shown in Figure 2, a roll of paper is placed on the supply side core holding section 9, and the roll of paper (printing paper P) is pulled out and passed through the rear paper guide 4b, between the drive roller 6 and the pressure roller 7, over the platen 4, and the front paper guide 4a, before being wound around the core 8a held by the take-up side core holding section 8.

[0076] Then, the printing control device 16 feeds out the printing paper P by rotating the supply side core holding unit 9, the winding side core holding unit 8, and the drive roller 6, and temporarily stops the feeding of the printing paper P when it reaches the initial printing position.

[0077] Next, the print control device 16 operates the main scanning drive motor 54 to move the head unit 10 in a first direction (either left or right) on the rail portion 5. Then, together with the movement of the head unit 10, the print control device 16 operates the fifth head 15 of the head unit 10 to apply the pretreatment liquid to the first scan line. Note that, when scanning the first scan line, ink is not ejected from the second to fourth heads 12 to 14.

[0078] Next, the print control device 16 advances the print paper P by one scan line so that the first scan line, to which the pretreatment liquid is applied, is positioned directly below the second to fourth heads 12 to .

[0079] Then, the print control device 16 moves the head unit 10 on the rail portion 5 in a second direction opposite to the first direction, and, with the movement, causes the second to fourth heads 12 to 14 to eject ink to print the first scan line. Furthermore, while printing the first scan line, the print control device 16 also operates the fifth head 15 to apply the pretreatment liquid to a second scan line that is next to the first scan line.

[0080] Next, the print control device 16 feeds out the printing paper P by one scan line, and places a second scan line directly below the second to fourth heads 12 to 14, and places a third scan line immediately below the fifth head 15.

[0081] Then, the print control device 16 moves the head unit 10 in the first direction on the rail portion 5, and in conjunction with the movement, operates the second to fourth heads 12 to 14 and the fifth head 15 to apply pretreatment liquid to the third scan line and print on the second scan line.

[0082] Thereafter, the printing control device 16 alternately repeats the process of feeding out one scan line of printing paper P and moving the head unit 10 on the rail portion 5 in the first direction or the second direction, in the same manner as described above, to sequentially apply pretreatment liquid to the (n+1)th scan line and print on the nth scan line.

[0083] In the above description, the operation is described when the pretreatment liquid is applied by the fifth head 15 without using the first head 11, but the base may be printed using the first head 11 without using the fifth head 15. In this case, the ink ejection timing from the first head 11 is the same as the ejection timing from the fifth head 15 described above.

[0084] The present invention further discloses the following supplementary notes. (Additional Note)

[0085] In the capping device of the present invention, the guide rail preferably has a curved shape.

[0086] In the capping device of the present invention, the guide rail preferably has an S-shape.

[0087] The capping device of the present invention comprises a first cap part that seals the outlet of a first discharge part that discharges a first liquid, and a second cap part that seals the outlet of a second discharge part that discharges a second liquid different from the first liquid, and it is preferable that the spacing between the first guide rails provided on both sides of the first cap part is different from the spacing between the second guide rails provided on both sides of the second cap part. [Explanation of symbols]

[0088] 1 Inkjet printing device 2 Base 2a wheels 3 pedestal 4 Platen 4a Front paper guide 4b Rear paper guide 4c Vacuum chamber 4d fan 5 Rail section 6 Drive roller 7 Pressure roller 8. Winding side core holder 8a Core body 9 Supply side core holding part 9a Core body 10 Head Unit 11~15 Heads 1~5 16 Printing control device 20 Capping unit 20a Case 21~25 1st~5th cap parts 21a Foundation 21b Capping member 21c bottom 21d Peripheral wall 21e Discharge hole 26~29 1st~4th guide rails 30,31 Cleaning roller 30a, 31a Sponge part 30b,31b Handle part 31 Cleaning roller 54 Main scanning drive motor 61 Transport drive motor 81 Winding drive motor 91 Supply drive motor As Roller shaft E1,E2 end H horizontal part P Print paper W wall

Claims

1. a cap portion that seals a discharge port of a discharge portion having a discharge port for discharging a liquid; A base on which the cap portion is provided; a guide rail provided on a mounting surface of the cap portion of the base for supporting and guiding a cleaning roller that cleans the cap portion; A capping device in which the length direction of the guide rail on an installation surface of the cap portion is inclined relative to the length direction of the cap portion on the installation surface of the cap portion.

2. 2. The capping device according to claim 1, wherein the guide rail has a curved shape.

3. 3. The capping device according to claim 1, wherein the guide rail has an S-shape.

4. a first cap portion that seals a discharge port of a first discharge portion that discharges a first liquid; a second cap portion that seals a discharge port of a second discharge portion that discharges a second liquid different from the first liquid; a base on which the first cap portion and the second cap portion are provided; a first guide rail provided on a mounting surface of the first cap portion and the second cap portion of the base, the first guide rail supporting and guiding a cleaning roller that cleans the first cap portion; a second guide rail provided on a mounting surface of the first cap portion and the second cap portion of the base, the second guide rail supporting and guiding a cleaning roller that cleans the second cap portion; a length direction of the first guide rail on the installation surface of the first cap portion and the second cap portion is inclined with respect to a length direction of the first cap portion on the installation surface of the first cap portion and the second cap portion, and a length direction of the second guide rail on the installation surface of the first cap portion and the second cap portion is inclined with respect to a length direction of the second cap portion on the installation surface of the first cap portion and the second cap portion, A capping device in which the spacing between the first guide rails provided on both sides of the first cap portion is different from the spacing between the second guide rails provided on both sides of the second cap portion.

Images