JP7623866B2 - Inkjet Printing Device - Google Patents

Description

The present invention relates to a head unit having multiple ejection sections that eject liquid, and an inkjet printing device having the head unit.

Conventionally, inkjet printing devices have been proposed that print by ejecting ink from an inkjet head onto print media such as paper and film.

One proposed inkjet printing device is one that moves a head unit equipped with multiple inkjet heads in the main scanning direction to print in a predetermined main scanning range, and then moves the head unit relative to the print medium in a sub-scanning direction perpendicular to the main scanning direction to sequentially print in the main scanning range.

As a head unit for use in such inkjet printing devices, a head unit has been proposed in which multiple inkjet heads are arranged offset in the sub-scanning direction and each inkjet head ejects a different liquid (see, for example, Patent Document 1).

JP 2020-185737 A

Here, when printing is performed using a head unit such as that described above, the pretreatment liquid may be ejected from one of the inkjet heads arranged offset in the sub-scanning direction, and color ink may be ejected from the other inkjet head.

In such a case, first, the pretreatment liquid is applied to a predetermined main scanning range by one of the inkjet heads, and then the head unit is moved in the sub-scanning direction relative to the print medium. This positions the inkjet head that ejects color ink onto the main scanning range onto which the pretreatment liquid has been applied, and ejects the color ink onto the pretreatment liquid.

As a result, the main scanning range of the pretreatment liquid and the main scanning range of the color inks need to be matched simply by moving the head unit relative to one another in the sub-scanning direction, so the inkjet head that ejects the pretreatment liquid and the inkjet head that ejects the color inks need to be adjusted to a preset positional relationship.

When adjusting the position of such an inkjet head, it is possible to use the print results from the inkjet head, for example. However, some of the pretreatment liquids described above are transparent and cannot be seen, and for inkjet heads that eject pretreatment liquids, it is not possible to check the print results and adjust the position of the inkjet head, as is the case with color inkjet heads.

The present invention aims to provide a head unit and inkjet printing device that allows easy and accurate adjustment of the position of the inkjet head.

The head unit of the present invention has a plurality of ejection sections in which a plurality of nozzles that eject liquid are arranged in a predetermined direction, and among the plurality of ejection sections, a first ejection section and a second ejection section that eject different liquids are arranged side by side in a direction perpendicular to the nozzle arrangement direction along the relative transport direction of the print medium with respect to the plurality of ejection sections, and are arranged with a shift in the nozzle arrangement direction so that some of the nozzles of the first ejection section and some of the nozzles of the second ejection section are in the same position in the nozzle arrangement direction.

According to the head unit of the present invention, the first and second ejection sections are arranged offset in the nozzle arrangement direction so that some of the nozzles of the first ejection section and some of the nozzles of the second ejection section are in the same position in the nozzle arrangement direction, so that the position of the inkjet head can be adjusted easily and accurately. Note that the method of adjusting the position of the inkjet head using this configuration will be described in detail later.

FIG. 1 is a diagram showing a schematic configuration of an inkjet printing device using an embodiment of a head unit of the present invention; FIG. 2 is a view of the inkjet printing apparatus shown in FIG. 1 from the direction of the arrow A. FIG. 2 is a top view showing a schematic configuration of an example of a head unit; FIG. 2 is a block diagram showing the configuration of a control system of the inkjet printing apparatus shown in FIG. FIG. 13 is a diagram showing an example of a print result when the sixth head is accurately positioned relative to the third head; FIG. 13 is a diagram showing an example of a print result when a sixth head is disposed one line closer to a third head in the front-to-rear direction; FIG. 13 is a diagram showing an example of a print result when the sixth head is disposed one line or more away from the third head in the front-to-back direction; FIG. 13 is a diagram showing an example of a position adjustment pin as a sixth head position adjustment mechanism.

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

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

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.

A stand 3 is erected on each base 2. A platen 4 is supported on the upper surfaces of the two opposing stand 3.

Front paper guide 4a and rear paper guide 4b are formed in an arc shape and extend from the front and rear of platen 4. In addition, as shown in FIG. 2, a vacuum chamber 4c in which a fan 4d is installed is provided below platen 4. Note that the vacuum chamber 4c is not shown in FIG. 1.

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

As shown in FIG. 2, a drive roller 6 and a pressure roller 7 are provided behind the platen 4, facing each other. Note that the drive roller 6 and the pressure roller 7 are omitted from FIG. 1.

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

The pressure roller 7, like the drive roller 6, is an elongated roller that extends in the extension direction of the platen 4 and is supported so that it can be raised and lowered by a lifting mechanism not shown.

The printing paper P on the rear paper guide 4b is then clamped between the drive roller 6 and the pressure roller 7, and as the drive roller 6 rotates while the pressure roller 7 presses the printing paper P, the printing paper P is sent forward.

A take-up side core holder 8 is provided on the front side of the base 2 of the inkjet printing device 1, which detachably holds the core 8a around which the printing paper P is wound. The take-up side core holder 8 is connected to a take-up drive motor 81 (see FIG. 4) via a torque limiter (not shown), and is configured so that the take-up side core holder 8 rotates due to the take-up drive motor 81.

A supply-side core holder 9 is provided on the rear side of the base 2 of the inkjet printing device 1, which detachably holds a core 9a of rolled paper on which printing paper P is wound in a roll. The supply-side core holder 9 is connected to a supply drive motor 91 (see FIG. 4) via a torque limiter (not shown), and is configured so that the supply-side core holder 9 is rotated by the supply drive motor 91.

As shown in FIG. 2, the roll paper (print paper P) held by the supply-side core holder 9 is pulled out and passes through the rear paper guide 4b, between the drive roller 6 and 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 holder 8.

A rail section 5 is mounted on the top of the two legs 3 via a support member (not shown). The rail section 5 includes a rail (not shown) extending in the left-right direction and a main scanning drive motor 51 (see FIG. 4) that moves the head unit 10 back and forth in the left-right direction on the rail.

Next, the head unit 10 of this embodiment will be described. Figure 3 is a top view showing the schematic configuration of the head unit 10.

As shown in FIG. 3, the head unit 10 of this embodiment has six heads, a first head 11 to a sixth head 16. The second head 12, the third head 13, the fourth head 14, and the fifth head 15 are inkjet heads that eject ink of different colors. In this embodiment, as shown in FIG. 3, the second head 12 ejects Y (yellow) ink, the third head 13 ejects K (black) ink, the fourth head 14 ejects M (magenta) ink, and the fifth head 15 ejects C (cyan) ink.

The sixth head 16 has a similar configuration to the second to fifth heads 12 to 15, 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 the printing process. As the pretreatment liquid, for example, a liquid that improves the color development and uniform application of the ink is used, but a pretreatment liquid that is already known can be used.

The first head 11 is an inkjet head that ejects ink in the same way as the second to fifth heads 12 to 15. 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.

As shown in FIG. 3, the first to sixth heads 11 to 16 are arranged side by side in the direction of movement of the head unit 10 (left and right direction), but the first head 11 and the second to fifth heads 12 to 15 are staggered, and the sixth head 16 and the second to fifth heads 12 to 15 are also staggered.

That is, the second to fifth heads 12 to 15 and the first and sixth heads 11, 16 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 sixth head 16 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 fifth heads 12 to 15 are also disposed at the same position in a direction (front-to-back direction) perpendicular to the movement direction of the head unit 10.

The first to sixth heads 11 to 16 are held by the head holder 10a, and the first to sixth heads 11 to 16 are installed so that their ejection surfaces are exposed from the head holder 10a.

The first to sixth heads 11 to 16 have multiple nozzles (shown by circles in FIG. 3) that eject liquid such as ink or pretreatment liquid onto the printing paper P. The multiple nozzles of the first to sixth heads 11 to 16 are arranged in the front-to-rear direction. In this embodiment, the front-to-rear direction is the nozzle arrangement direction, and is also the transport direction of the printing paper P.

The first and sixth heads 11, 16 and the second to fifth heads 12 to 15 are arranged to be offset in the front-to-back direction (the direction in which the nozzles are arranged) as described above, but some of the nozzles of the first head 11 and some of the nozzles of the second to fifth heads 12 to 15 are arranged to be in the same position in the front-to-back direction. Also, some of the nozzles of the sixth head 16 and some of the nozzles of the second to fifth heads 12 to 15 are arranged to be in the same position in the front-to-back direction.

3, the first head 11 and the second to fifth heads 12 to 15 are arranged so as to be in the same position in the front-to-back direction by one nozzle. Also, the sixth head 16 and the second to fifth heads 12 to 15 are arranged so as to be in the same position in the front-to-back direction by one nozzle.

When the first to sixth heads 11 to 16 are arranged in a staggered manner as in this embodiment, for example, the first and sixth heads 11, 16 and the second to fifth heads 12 to 15 need to scan the same scanning range, so it is necessary to accurately adjust their positional relationship. In this embodiment, the first and sixth heads 11, 16 and the second to fifth heads 12 to 15 are arranged to be in the same position in the front-to-back direction by one nozzle as described above, so that the above-mentioned positional relationship can be easily and accurately adjusted. The method of adjusting the positional relationship between the first and sixth heads 11, 16 and the second to fifth heads 12 to 15 will be described in detail later.

Figure 4 is a block diagram showing the configuration of the control system of the inkjet printing device 1 of this embodiment. The inkjet printing device 1 operates each of the controlled parts shown in Figure 4 in response to a control signal from the print control device 17.

The print control device 17 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.

The print control device 17 is composed of a computer equipped with a CPU (Central Processing Unit), semiconductor memory, a hard disk, etc. Based on an input print job, the print control device 17 executes a print control program stored in advance in a storage medium such as a semiconductor memory or a hard disk, and controls each part shown in FIG. 4 by operating an electric circuit.

Next, the printing operation of the inkjet printing device 1 of this embodiment will be described. Note that, in this case, the first head 11 is not used, and the pretreatment liquid is ejected from the sixth head 16 to apply it to the printing paper P, and then ink is ejected from the second to fifth heads 12 to 15 to print on the printing paper P to which the pretreatment liquid has been applied.

First, as shown in FIG. 2, a roll of paper is placed on the supply-side core holder 9, and the roll of paper (print paper P) is pulled out and passed through the rear paper guide 4b, between the drive roller 6 and 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 holder 8.

The print control device 17 then rotates the supply side core holding unit 9, the take-up side core holding unit 8, and the drive roller 6 to feed the print paper P, and stops feeding the print paper P when it reaches the initial printing position.

Next, the print control device 17 operates the main scanning drive motor 51 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 17 operates the sixth head 16 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 fifth heads 12 to 15.

Next, the print control device 17 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 fifth heads 12 to 15.

The print control device 17 then moves the head unit 10 on the rail section 5 in a second direction opposite to the first direction, and, as the head unit 10 moves, ejects ink from the second to fifth heads 12 to 15 to print the first scan line. The print control device 17 also prints the first scan line and operates the sixth head 16 to apply pretreatment liquid to the second scan line that follows the first scan line.

The print control device 17 then advances the print paper P by one scan line, positions the second scan line directly below the second to fifth heads 12 to 15, and positions the third scan line, which is the next to the second scan line, directly below the sixth head 16.

The print control device 17 then moves the head unit 10 in the first direction on the rail section 5, and operates the second to fifth heads 12 to 15 and the sixth head 16 in conjunction with the movement, thereby applying pretreatment liquid to the third scan line and printing the second scan line.

Then, the print control device 17 alternately repeats the process of feeding out one scan line of print paper P and moving the head unit 10 on the rail section 5 in the first direction or the second direction, in the same manner as described above, to sequentially apply pretreatment liquid to the n+1th scan line and print on the nth scan line.

In the above explanation, the operation is described when the pretreatment liquid is applied by the sixth head 16 without using the first head 11, but the base may be printed using the first head 11 without using the sixth head 16. In this case, the ink ejection timing from the first head 11 is the same as the ejection timing from the sixth head 16 in the above explanation.

Next, we will explain the position adjustment of the first to sixth heads 11 to 16 that is performed before the printing operation described above. Note that in this embodiment, the second to fifth heads 12 to 15 are arranged at the same position in the front-to-back direction, and we will explain a method for adjusting the position of the sixth head 16 relative to the positions of the second to fifth heads 12 to 15. Also, in this embodiment, the third head 13 and the sixth head 16 correspond to the first ejection unit and the second ejection unit in the present invention.

As described above, the sixth head 16 ejects the pretreatment liquid, but depending on the type of pretreatment liquid, it may not be visible even after printing. Therefore, it is very difficult to adjust the position of the sixth head 16 using only the application results of the pretreatment liquid.

Therefore, in this embodiment, in one scan of the head unit 10 in the first or second direction, the pretreatment liquid is ejected from the sixth head 16 and K ink is ejected from the third head 13.

In this embodiment, as described above, the third head 13 (the second to fifth heads 12 to 15) and the sixth head 16 are positioned so that they are in the same position in the front-to-back direction by one nozzle. Therefore, when the third head 13 (the second to fifth heads 12 to 15) and the sixth head 16 are positioned accurately, both the pretreatment liquid and the K ink are ejected onto the same dot on one line at the same position in the front-to-back direction by one scan of the head unit 10.

In this way, when both the pretreatment liquid and K ink are ejected onto the same dot in one scan of the head unit 10, the K ink is ejected onto the pretreatment liquid dot before the pretreatment liquid dries, so the K ink spreads due to the pretreatment liquid, and the shape of the dot changes compared to when K ink is ejected onto a location where no pretreatment liquid is ejected. For example, the size and non-uniformity (degree of circularity) of the dot change.

Specifically, when the sixth head 16 is positioned accurately relative to the third head 13 (the second to fifth heads 12 to 15) as shown in Fig. 3, that is, when both the pretreatment liquid and K ink are ejected only onto dots on one line, the K dots on the line onto which the pretreatment liquid is ejected are deformed due to bleeding, as shown in Fig. 5. In contrast, the K dots formed by the nozzles of the third head 13 that are not positioned in the same position in the front-to-back direction as the nozzles of the sixth head 16 do not bleed due to the pretreatment liquid, and so are not deformed and have a shape close to a perfect circle.

Therefore, if the print result is as shown in Figure 5, it can be determined that the sixth head 16 is positioned accurately relative to the third head 13 (the second to fifth heads 12 to 15), and there is no need to adjust the position of the sixth head 16.

On the other hand, for example, as shown in Figure 6, if the K dots deformed by bleeding cover two lines, it can be determined that the sixth head 16 is positioned one line closer to the third head 13 (the second to fifth heads 12 to 15) in the front-to-back direction.

Therefore, if the print result is as shown in Figure 6, the position of the sixth head 16 is adjusted by moving it one line in the direction away from the third head 13.

Also, for example, as shown in Figure 7, if there are no K dots that have been deformed due to bleeding, it can be determined that the sixth head 16 is positioned at least one line away from the third head 13 (the second to fifth heads 12 to 15) in the front-to-back direction.

Therefore, if the print result is as shown in FIG. 7, the sixth head 16 is moved a predetermined distance in the direction in which the sixth head 16 approaches the third head 13, the head unit 10 is scanned once again, both the pretreatment liquid and the K ink are ejected, the print result is confirmed, and the position of the sixth head 16 is adjusted as appropriate.

Note that during actual printing, the pretreatment liquid ejection range (scanning range) by the sixth head 16 and the ink ejection range (scanning range) by the second to fifth heads 12 to 15 overlap by one nozzle in one scan, but the ink ejection by the second to fifth heads 12 to 15 is not necessarily continuous for one line, but is thinned out, so the bleeding described above does not become a problem. Also, when actually printing, it is possible not to eject pretreatment liquid or ink in the overlapping range of one nozzle between the sixth head 16 and the second to fifth heads 12 to 15 in one scan.

In addition, the position adjustment of the sixth head 16 can be achieved, for example, by providing a position adjustment pin 16a at the end of the sixth head 16, as shown in FIG. 8. The position adjustment pin 16a is formed in a cylindrical shape and extends in the vertical direction. The rotation axis of the position adjustment pin 16a is eccentric in the length direction (front-to-back direction) of the sixth head 16. This allows the position of the sixth head 16 in the front-to-back direction to be adjusted by rotating the position adjustment pin 16a in the direction of the arrow shown in FIG. 8. Note that the position adjustment mechanism for the sixth head 16 is not limited to the position adjustment pin 16a described above, and other known mechanisms can be used.

In the above embodiment, the position adjustment method of the sixth head 16 that ejects invisible pretreatment liquid has been described. However, when ejecting invisible liquid from the first head 11 as well, similar to the sixth head 16, the first head 11 ejects both liquid and K ink from the third head 13 in one scan, and the position adjustment can be performed by checking the print result (degree of bleeding) of the K ink. For example, in the above embodiment, an example of ejecting white ink from the first head 11 onto a black background has been described. However, when ejecting white ink from the first head 11 onto a white background, the white ink is invisible, so the above-mentioned position adjustment method can be used.

In the above embodiment, an example was described in which the pretreatment liquid was ejected from the sixth head 16, but examples of invisible transparent liquids are not limited to the pretreatment liquid, but include overcoat ink, etc.

In the inkjet printing device 1 of the above embodiment, some of the nozzles of the first and sixth heads 11, 16 and some of the nozzles of the second to fifth heads 12 to 15 are arranged to be in the same position in the front-to-rear direction. Therefore, for example, as described above, by ejecting both ink and pretreatment liquid onto the same dots using the third head 13 and the sixth head 16 in one scan and checking the print result, the position of the sixth head 16 relative to the second to fifth heads 12 to 15 can be easily and accurately adjusted.

In addition, in the above embodiment, the third head 13 ejects visible K ink, and the sixth head 16 ejects invisible pretreatment liquid, so that even with the sixth head 16 ejecting invisible pretreatment liquid, position adjustment can be performed easily and accurately.

In addition, in the above embodiment, the third head 13 (the second to fifth heads 12 to 15) and the sixth head 16 are arranged to be in the same position by one nozzle in the front-to-back direction, so that the overlapping area between the nozzles of the third head 13 and the nozzles of the sixth head 16 in the front-to-back direction can be minimized.

The greater the overlap between the nozzles of the third head 13 and the nozzles of the sixth head 16 in the front-to-rear direction, the greater the effect that the pretreatment liquid ejected from the sixth head 16 has on the ink ejected from the third head 13. In other words, the pretreatment liquid ejected from the sixth head 16 may mix with the ink ejected from the third head 13 and solidify on the ink ejection surface of the third head 13, which may result in poor ink ejection.

As described above, by minimizing the overlap between the nozzles of the third head 13 and the nozzles of the sixth head 16 in the front-to-rear direction (by one nozzle), the occurrence of the above-mentioned ink ejection failures can be prevented. However, in the present invention, the overlap in the front-to-rear direction is not limited to one nozzle, and may be, for example, two nozzles. The extent to which the overlap should be large can be determined appropriately depending on the left-to-right distance between the second to fifth heads 12 to 15 that eject ink and the sixth head 16 that ejects pretreatment liquid.

In addition, in the above embodiment, the position of the sixth head 16 can be adjusted in the front-to-rear direction using the position adjustment pin 16a, so the position of the sixth head 16 can be easily adjusted.

In addition, in the above embodiment, the head unit 10 is configured to be movable in the left-right direction, so that by checking the print result of the line printed by one scan, it is possible to more accurately recognize the degree of bleeding of the K dots as described above, and more accurate position adjustment can be performed.

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

In the head unit of the present invention, one of the first and second ejection sections can eject visible ink, and the other ejection section can eject invisible liquid.

In the head unit of the present invention, the first ejection section and the second ejection section can be arranged so that they are in the same position in the nozzle arrangement direction by one nozzle.

In the head unit of the present invention, it is preferable that at least one of the first ejection section and the second ejection section is configured so that the position in the nozzle arrangement direction can be adjusted.

The head unit of the present invention can be configured to be movable in a direction perpendicular to the nozzle arrangement direction.

The inkjet printing device of the present invention includes the head unit described above, and prints by ejecting ink from the ejection portion of the head unit onto a printing medium.

1 Inkjet printing device 2 Base 2a Wheels 3 Footrest 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 Take-up side core body holding section 8a Core body 9 Supply side core body holding section 9a Core body 10 Head unit 10a Head holders 11 to 16 First to sixth heads 17 Print control device 16a Position adjustment pin 51 Main scanning drive motor 61 Transport drive motor 81 Take-up drive motor 91 Supply drive motor P Print paper

Claims (3)

a head unit including a plurality of ejection sections in which a plurality of nozzles for ejecting liquid are arranged in a predetermined direction, and among the plurality of ejection sections, a first ejection section for ejecting ink and a second ejection section for ejecting a pretreatment liquid are arranged side by side in a direction perpendicular to the nozzle arrangement direction along a relative transport direction of a print medium with respect to the plurality of ejection sections, and the head unit is arranged with a shift in the nozzle arrangement direction so that some nozzles of the first ejection section and some nozzles of the second ejection section overlap in the nozzle arrangement direction;
a control unit that controls the head unit to eject ink from the first ejection unit and eject a pretreatment liquid from the second ejection unit while moving the head unit in a direction perpendicular to the transport direction, and to eject the ink onto the same dot before the pretreatment liquid ejected onto the print medium dries, thereby causing bleeding in the dot;
An inkjet printing device , wherein the first ejection section and the second ejection section are arranged so as to overlap with each other by only one nozzle in a nozzle arrangement direction . a head unit including a plurality of ejection sections in which a plurality of nozzles for ejecting liquid are arranged in a predetermined direction, and among the plurality of ejection sections, a first ejection section for ejecting ink and a second ejection section for ejecting a pretreatment liquid are arranged side by side in a direction perpendicular to the nozzle arrangement direction along a relative transport direction of a print medium with respect to the plurality of ejection sections, and the head unit is arranged with a shift in the nozzle arrangement direction so that some nozzles of the first ejection section and some nozzles of the second ejection section overlap in the nozzle arrangement direction;
a control unit that controls the head unit to eject ink from the first ejection unit and eject a pretreatment liquid from the second ejection unit while moving the head unit in a direction perpendicular to the transport direction, and to eject the ink onto the same dot before the pretreatment liquid ejected onto the print medium dries, thereby causing bleeding in the dot;
An inkjet printing apparatus , wherein at least one of the first ejection section and the second ejection section is configured to be able to adjust a position in a nozzle arrangement direction . The inkjet printing device according to claim 1 or 2, wherein the first ejection unit ejects visible ink, and the second ejection unit ejects invisible pretreatment liquid.