JP2018144410A - Inkjet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress distortion of the shape of ink ejected to a recording medium. SOLUTION: A control device 60 of an inkjet printer 100 has a first movement control unit 62 that reciprocates a discharge unit 40 that discharges ink in a main scanning direction Y, and a discharge unit 40 that moves in the main scanning direction Y. During that time, after the ejection control unit 63 for ejecting ink from the ejection unit 40 and the ejection unit 40 reciprocate in the main scanning direction Y, the recording medium 5 mounted on the platen 25 is moved by a predetermined distance in the sub-scanning direction X. It is provided with a second movement control unit 64 to be operated. The second movement control unit 64 moves the recording medium 5 in the sub-scanning direction X after a predetermined first time T1 has elapsed after the reciprocating movement of the discharge unit 40 is completed. The first movement control unit 62 sets the discharge unit 40 after the second time T2, which is longer than the first time T1, elapses after the movement of the recording medium 5 in the sub-scanning direction X by a predetermined distance is completed. Move back and forth. [Selection diagram] Fig. 6

Description

  The present invention relates to an inkjet printer.

  Conventionally, ink jet printers are known. For example, an inkjet printer disclosed in Patent Document 1 includes a platen on which a recording medium is placed, and an ink head that ejects ink toward the platen. Such an ink jet printer is configured to eject ink from the ink head while the ink head moves in the main scanning direction. Further, such an ink jet printer is configured to move a recording medium placed on a platen in the sub-scanning direction.

  For example, printing of one scan is performed by ejecting ink from the ink head while the ink head reciprocates in the main scanning direction. Then, after printing for one scan, the recording medium placed on the platen is moved a predetermined distance in the sub-scanning direction.

JP 2004-196537 A

  By the way, in the ink jet printer as described above, the recording medium placed on the platen moves in the sub-scanning direction immediately after the ink is ejected from the ink head and printing of one scan is completed. Immediately after the movement of the recording medium in the sub-scanning direction is completed, the movement of the ink head in the main scanning direction is started, and printing for the next scan is performed. Immediately after the movement of the recording medium in the sub-scanning direction is completed, minute vibrations may occur in the ink ejected to the recording medium. When printing for the next scan is performed in a state where such minute vibration is generated, there is a possibility that the ink ejected to the recording medium may be displaced. As a result, the shape of the ink ejected to the recording medium may be distorted.

  SUMMARY An advantage of some aspects of the invention is that it provides an ink jet printer capable of suppressing distortion of the shape of ink ejected onto a recording medium.

  An ink jet printer according to the present invention includes a platen, a discharge unit, a first moving mechanism, a second moving mechanism, and a control device. A recording medium is placed on the platen. The ejection unit ejects ink toward the platen. The first moving mechanism reciprocates the ejection unit in the main scanning direction. The second moving mechanism moves the recording medium placed on the platen in a sub-scanning direction orthogonal to the main scanning direction. The control device is electrically connected to the discharge unit, the first movement mechanism, and the second movement mechanism, and controls the discharge unit, the first movement mechanism, and the second movement mechanism. The control device includes a first movement control unit, a discharge control unit, and a second movement control unit. The first movement control unit controls the first movement mechanism to reciprocate the discharge unit in the main scanning direction. The ejection control unit ejects ink from the ejection unit while the ejection unit is moved in the main scanning direction by the first movement control unit. The second movement control unit moves the recording medium placed on the platen by a predetermined distance in the sub-scanning direction after the discharge unit is reciprocated in the main scanning direction by the first movement control unit. The second moving mechanism is controlled so that The second movement control unit moves the recording medium placed on the platen in the sub-scanning direction after a predetermined first time has elapsed after the reciprocating movement in the main scanning direction by the ejection unit is completed. Move to. The first movement control unit moves the recording medium placed on the platen the predetermined distance in the sub-scanning direction by the second movement control unit, and then has a predetermined time longer than the first time. After the second time elapses, the ejection unit is reciprocated in the main scanning direction.

  According to the inkjet printer, after the second time has elapsed after the movement of the recording medium placed on the platen by the predetermined distance in the sub-scanning direction is completed, the ejection unit reciprocates in the main scanning direction. The move starts. The second time is the first time from when the reciprocating movement in the main scanning direction by the ejection unit is completed until the movement in the sub scanning direction by the recording medium placed on the platen is started. Longer than. The second time ensures a time for the vibration of the ink ejected to the recording medium to converge. Therefore, the printing of the next scan is started in a state where vibrations of the ink ejected onto the recording medium are suppressed even a little. Accordingly, it is possible to suppress distortion of the shape of the ink ejected to the recording medium due to the vibration of the ink ejected to the recording medium.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet printer which can suppress that the shape of the ink discharged to the recording medium is distorted can be provided.

1 is a perspective view showing a printer according to a first embodiment. 2 is a plan view showing an internal configuration of the printer. FIG. FIG. 3 is a cross-sectional view of a recording medium showing a state in which a plurality of types of ink are superimposed on the recording medium. It is a bottom view of a head. It is a block diagram of a printer. 6 is a timing chart showing the relationship between the moving speed of the head and the moving speed of the recording medium. It is a bottom view of the head concerning a 2nd embodiment. It is a bottom view of the head concerning a 3rd embodiment.

  Hereinafter, an inkjet printer (hereinafter also referred to as “printer”) according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiments described here are not intended to limit the present invention. In addition, members / parts having the same action are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified as appropriate.

<First Embodiment>
FIG. 1 is a perspective view of a printer 100 according to the first embodiment. In the following description, when the printer 100 is viewed from the front, the direction away from the printer 100 is defined as the front, and the direction approaching the printer 100 is defined as the rear. Left, right, top, and bottom mean left, right, top, and bottom when the printer 100 is viewed from the front. Further, the symbols F, Rr, L, R, U, and D in the drawings mean front, rear, left, right, upper, and lower, respectively. In addition, the symbol Y in the drawing indicates the main scanning direction. Here, the main scanning direction Y is the left-right direction. Reference numeral X indicates the sub-scanning direction. Here, the sub-scanning direction X is the front-rear direction and is orthogonal to the main scanning direction Y in plan view. Reference sign Z indicates the height direction, that is, the vertical direction. In the present embodiment, a direction from the rear to the front in the sub-scanning direction X is referred to as a going direction X1. A direction from the front to the rear in the sub-scanning direction X is referred to as a return direction X2. The rear side in the sub-scanning direction X is referred to as the upstream side, and the front side in the sub-scanning direction X is referred to as the downstream side. However, the above direction is only a direction determined for convenience of description, and does not limit the installation mode of the printer 100 at all, and does not limit the present invention.

  As shown in FIG. 1, the printer 100 is an ink jet printer. In the present embodiment, the printer 100 is a so-called large printer that is longer in the main scanning direction Y than a household printer. For example, the printer 100 is a business printer. The printer 100 sequentially moves the roll-shaped recording medium 5 forward (here, downstream in the sub-scanning direction X) and ejects ink from a head 40 (see FIG. 4) that moves in the main scanning direction Y. Thus, an image is printed on the recording medium 5. The recording medium 5 is an object on which an image is printed. Note that the type of the recording medium 5 is not particularly limited. The recording medium 5 may be paper such as plain paper or inkjet printing paper. The recording medium 5 may be a transparent sheet made of resin such as polyvinyl chloride (PVC) or polyester, or glass, or a sheet made of metal or rubber. . When the coating agent is applied to the recording medium 5, the ink that has landed on the surface of the recording medium 5 does not penetrate the periphery of the landing position, and the ink is fixed to the recording medium 5 in a state of small diameter dots. Good.

  As shown in FIG. 1, the printer 100 includes a main body 10, legs 11, an operation panel 12, and a cover 15. The main body 10 has a casing extending in the main scanning direction Y. The legs 11 support the main body 10 and are provided on the lower surface of the main body 10. The operation panel 12 is provided, for example, on the right front surface of the main body 10. However, the position of the operation panel 12 is not particularly limited. The operation panel 12 is used by the user for operations related to printing. Although not shown, for example, information related to printing such as resolution and ink density, a display unit for displaying the status of the printer 100 during printing, and information related to printing are input to the operation panel 12. An input unit is provided.

  The cover 15 is provided on the main body 10. Here, the cover 15 is attached to the upper part of the main body 10 so as to be freely opened and closed. A discharge port 13 for discharging the recording medium 5 is formed below the cover 15 and below the main body 10. A guide 14 for guiding the recording medium 5 discharged from the discharge port 13 is provided at a position in front of and below the discharge port 13. The guide 14 extends forward and obliquely downward from the discharge port 13.

  FIG. 2 is a plan view showing the internal configuration of the printer 100. As shown in FIG. 2, the printer 100 includes a platen 25. The platen 25 supports the recording medium 5 when printing on the recording medium 5. The recording medium 5 is placed on the platen 25. Printing on the recording medium 5 is performed on the platen 25. In the present embodiment, the platen 25 extends in the main scanning direction Y and continues to the guide 14 (see FIG. 1).

  The printer 100 includes a first moving mechanism 51 and a second moving mechanism 52. The first moving mechanism 51 moves the head 40 in the main scanning direction Y relative to the recording medium 5 placed on the platen 25. Here, the first moving mechanism 51 reciprocates the head 40 in the main scanning direction Y. The configuration of the first moving mechanism 51 is not particularly limited. In the present embodiment, the first moving mechanism 51 includes a guide rail 20, a pulley 21, a pulley 22, an endless belt 23, a motor 24, and a carriage 30. The guide rail 20 is disposed below the cover 15 (see FIG. 1) and above the platen 25. The guide rail 20 extends in the main scanning direction Y. The pulley 21 is provided at the right end portion of the guide rail 20. The pulley 22 is provided at the left end portion of the guide rail 20. The belt 23 is wound around the pulley 21 and the pulley 22. In the present embodiment, the motor 24 is connected to the pulley 21. In this case, the pulley 21 is a driving pulley and the pulley 22 is a driven pulley. However, the motor 24 may be connected to the pulley 22. In this embodiment, the motor 24 drives the pulley 21 so that the belt 23 travels between the pulley 21 and the pulley 22.

  The carriage 30 is attached to the belt 23. Although illustration is omitted, the carriage 30 is engaged with the guide rail 20 and is slidably provided on the guide rail 20. A head 40 is mounted on the carriage 30. In the present embodiment, the first moving mechanism 51 causes the head 40 mounted on the carriage 30 to move in the main scanning direction as the belt 23 travels by driving the motor 24 and the carriage 30 moves in the main scanning direction Y. Move to Y.

The second moving mechanism 52 moves the recording medium 5 placed on the platen 25 in the sub-scanning direction X relative to the head 40 (see FIG. 4). Here, the second moving mechanism 52 moves the recording medium 5 placed on the platen 25 by a predetermined distance in the sub-scanning direction X (specifically, the going direction X1). The configuration of the second moving mechanism 52 is not particularly limited. In the present embodiment, the second moving mechanism 52 includes a pair of upper and lower rollers 26 (only the upper roller 26 is shown in FIG. 2, and the lower roller 26 is omitted) and the motor 27. Have. For example, the pair of upper and lower rollers 26 are respectively disposed at the left end portion and the right end portion of the platen 25. However, the number and installation positions of the pair of upper and lower rollers 26 are not particularly limited. One of the pair of upper and lower rollers 26 is a driving roller (hereinafter also referred to as a grid roller) that rotates by itself. A motor 27 is connected to the grid roller 26. When the motor 27 is driven, the grid roller 26 rotates. The other roller 26 is a driven roller (hereinafter also referred to as a pinch roller) for sandwiching the recording medium 5 together with the grid roller. The pinch roller 26 is configured to be movable in the vertical direction. In the present embodiment, the second moving mechanism 52 is placed on the platen 25 by the motor 27 rotating one roller (grid roller) 26 with the recording medium 5 sandwiched between the pair of rollers 26. The recording medium 5 is conveyed in the sub-scanning direction X.

  By the way, in this embodiment, the printer 100 is an apparatus that prints a printed matter by superimposing a plurality of types of ink on the recording medium 5. FIG. 3 is a cross-sectional view of the recording medium 5 showing a state in which a plurality of types of ink are superimposed on the recording medium 5. As shown in FIG. 3, for example, on the recording medium 5, a layer formed by the first ink 6a and a layer formed by the second ink 6b are sequentially stacked from the bottom. Specifically, the first ink 6 a is ejected onto the surface of the recording medium 5. Then, the second ink 6 b is ejected onto the first ink 6 a ejected to the recording medium 5. However, the number of ink layers formed on the recording medium 5 is not particularly limited. For example, the ink layer formed on the recording medium 5 may be one layer or three or more layers.

  Each kind of the first ink 6a and the second ink 6b is not particularly limited. In the present embodiment, the first ink 6a is a base ink. The second ink 6b is an image forming ink. Here, the “underlying ink” is ink that improves the fixability of the second ink 6b to the recording medium 5 and ink that suppresses the bleeding of the second ink 6b. The “underlying ink” is an ink for improving the color of the second ink 6b and an ink for making the second ink 6b look clear. The specific ink type of the base ink is not particularly limited. For example, the base ink is white ink. The “image forming ink” is ink for forming a print image on the recording medium 5. “Image forming ink” refers to colored ink. For example, the image forming ink is a process color ink. Examples of the process color ink include cyan ink, magenta ink, yellow ink, black ink, light cyan ink, and light magenta ink.

  FIG. 4 is a bottom view of the head 40. As shown in FIG. 4, the printer 100 includes a head 40. The head 40 is mounted on the carriage 30. The head 40 is disposed above the platen 25 (see FIG. 2), and is slidably engaged with the guide rail 20 (see FIG. 2) via the carriage 30. The head 40 is moved in the main scanning direction Y along the guide rail 20 by the first moving mechanism 51 (see FIG. 2). In the present embodiment, the head 40 includes a first ink head 40a and a plurality of second ink heads 40b to 40e. The number of ink heads 40a to 40e is not particularly limited, but is five in the present embodiment. A plurality of nozzles 41a are formed side by side in the sub-scanning direction X on the bottom surface of each ink head 40a-40e. The plurality of nozzles 41a in each of the ink heads 40a to 40e are arranged in a straight line, but may be arranged in a staggered pattern. Ink is ejected from the respective nozzles 41a of the ink heads 40a to 40e.

  In the present embodiment, each of the plurality of ink heads 40a to 40e discharges any one of the first ink 6a and the second ink 6b. Here, the first ink head 40a discharges white ink which is an example of the first ink 6a. The plurality of second ink heads 40b to 40e eject process color ink which is an example of the second ink 6b. Specifically, for example, the second ink head 40b discharges cyan ink. The second ink head 40c discharges magenta ink. The second ink head 40d discharges yellow ink. The second ink head 40e discharges black ink. In the present embodiment, the number of the second ink heads 40b to 40e is four. However, the number of the second ink heads 40b to 40e is not particularly limited, and may be six, for example. In the present embodiment, the head 40 corresponds to the “ejection unit” of the present invention. The first ink head 40a corresponds to the “first ejection portion” of the present invention. The second ink heads 40b to 40e correspond to the “second ejection unit” of the present invention.

  Next, the positional relationship between the plurality of ink heads 40a to 40e will be described. As shown in FIG. 4, in the main scanning direction Y, the ink heads 40 a to 40 e are arranged in the carriage 30 so that the first ink head 40 a and the plurality of second ink heads 40 b to 40 e are arranged in this order from the left. Yes. However, the arrangement order of the ink heads 40a to 40e in the main scanning direction Y is not particularly limited.

  In the present embodiment, the plurality of second ink heads 40 b to 40 e are arranged at the same position in the sub-scanning direction X. The first ink head 40a is disposed behind the plurality of second ink heads 40b to 40e. The first ink head 40a is disposed upstream of the plurality of second ink heads 40b to 40e in the sub-scanning direction X. In other words, the first ink head 40a is provided in the sub-scanning direction X on the side toward the return direction X2 from the plurality of second ink heads 40b to 40e. The front end of the first ink head 40a is located behind the rear ends of the plurality of second ink heads 40b to 40e.

  In the present embodiment, an ink cartridge 45 (see FIG. 2) is connected to the head 40. Here, the head 40 and the ink cartridge 45 are connected to each other via a tube 46 (see FIG. 2). The ink cartridge 45 contains ink to be supplied to the head 40, that is, ink used for printing. Specifically, in the present embodiment, the ink cartridge 45 contains a base ink that is an example of the first ink 6a and an image forming ink that is an example of the second ink 6b. The ink accommodated in the ink cartridge 45 is supplied to each ink head 40a-40e through the tube 46, and is discharged from the nozzle 41a as shown in FIG. The installation position of the ink cartridge 45 is not particularly limited. For example, although not shown, the ink cartridge 45 may be detachably provided on the upper surface of the main body 10.

  FIG. 5 is a block diagram of the printer 100. As shown in FIG. 5, the printer 100 includes a control device 60. The control device 60 is a device that controls printing on the recording medium 5. The control device 60 includes a microcomputer and is provided inside the main body 10. The control device 60 includes a central processing unit (CPU), a ROM that stores programs executed by the CPU, a RAM, and the like. Here, the control device 60 performs control related to printing using a program stored in the microcomputer.

  The control device 60 is electrically connected to the motor 24 of the first moving mechanism 51, the motor 27 of the second moving mechanism 52, the first ink head 40a, and the second ink heads 40b to 40e. The control device 60 controls the motor 24, the motor 27, the first ink head 40a, and the second ink heads 40b to 40e. The control device 60 controls the rotation of the pulley 21 and the traveling of the belt 23 (see FIG. 2) by controlling the driving of the motor 24 of the first moving mechanism 51. Thus, the control device 60 controls the movement of the head 40 (specifically, the ink heads 40a to 40e) in the main scanning direction Y. The control device 60 controls the movement of the recording medium 5 placed on the platen 25 in the sub-scanning direction X by controlling the rotation of the grid roller 26 by controlling the driving of the motor 27 of the second moving mechanism 52. To do. The control device 60 controls the timing at which the ink heads 40a to 40e eject ink.

  The control device 60 includes a storage unit 61, a first movement control unit 62, a discharge control unit 63, and a second movement control unit 64. For example, a print image to be printed is stored in the storage unit 61. The first movement control unit 62 controls the first movement mechanism 51 to reciprocate the head 40 in the main scanning direction Y. The ejection control unit 63 ejects ink from the head 40 while the head 40 is reciprocated in the main scanning direction Y by the first movement control unit 62. In the present embodiment, the discharge control unit 63 includes a first discharge control unit 65 and a second discharge control unit 66. The first ejection control unit 65 ejects the first ink 6a (here, the base ink) from the first ink head 40a. The second ejection control unit 66 ejects the second ink 6b (here, image forming ink) from the second ink heads 40b to 40e. After the head 40 is reciprocated in the main scanning direction Y by the first movement control unit 62, the second movement control unit 64 moves the recording medium 5 placed on the platen 25 in the sub-scanning direction X (specifically, from the back). The second moving mechanism 52 is controlled so as to move a predetermined distance in the forward direction X1). In addition, each part mentioned above may be comprised by software, and may be comprised by hardware. For example, each unit described above may be performed by a processor or may be incorporated in a circuit.

  The configuration of the printer 100 according to the present embodiment has been described above. Next, a procedure for the printer 100 to print on the recording medium 5 will be described. Here, as shown in FIG. 3, a layer formed by the first ink 6a and a layer formed by the second ink 6b are sequentially laminated on the recording medium 5 from below. Is produced. In the present embodiment, a print image to be printed is stored in advance in the storage unit 61, and printing is performed based on this print image.

  In the present embodiment, ink is ejected from the head 40 while the head 40 reciprocates once in the main scanning direction Y. Here, one reciprocation of the head 40 in the main scanning direction Y is called “scanning”. In the first scan, the first movement control unit 62 controls driving of the motor 24 of the first movement mechanism 51 so that the head 40 moves in the main scanning direction Y. At this time, when the first ink head 40 a passes over the area of the recording medium 5 corresponding to the position of the first ink 6 a in the print image stored in the storage unit 61, the first discharge control unit of the discharge control unit 63. 65 discharges the first ink 6a from the first ink head 40a onto the recording medium 5 placed on the platen 25. Thus, printing with the first ink 6a for the first scan is performed.

  After the reciprocating movement in the main scanning direction Y by the head 40 is completed, the second movement control unit 64 moves the recording medium 5 placed on the platen 25 in a predetermined direction X1 in the sub-scanning direction X. The drive of the motor 27 of the second moving mechanism 52 is controlled so as to move the distance. Here, it is assumed that the predetermined distance is stored in the storage unit 61 in advance.

  Next, the first movement control unit 62 controls the motor 24 of the first movement mechanism 51 to move the head 40 in the main scanning direction Y, so that the next scan is performed. At this time, when the first ink head 40 a passes over the area of the recording medium 5 corresponding to the position of the first ink 6 a in the print image stored in the storage unit 61, the first ejection control unit 65 performs the platen 25. The first ink 6a is discharged from the first ink head 40a onto the recording medium 5 placed on the recording medium 5. At the same time, when the second ink heads 40 b to 40 e pass over the area of the recording medium 5 corresponding to the position of the second ink 6 b in the print image, the second ejection control unit 66 records on the platen 25. The second ink 6b is ejected onto the medium 5 from the second ink heads 40b to 40e. Note that the printing with the second ink 6b is performed on the area of the recording medium 5 after the printing with the first ink 6a is performed. As described above, in the present embodiment, printing by the first ink 6a and printing by the second ink 6b are performed at the same time, so that the second and subsequent scans are printed. As described above, the first ink 6a by the first discharge controller 65 is alternately performed while the movement of the head 40 in the main scanning direction Y and the movement of the recording medium 5 in the direction X1 in the sub-scanning direction X are alternately performed. And printing related to the second ink 6b by the second ejection control unit 66. With the above procedure, printing of the print image stored in the storage unit 61 is completed.

  In the following description, the time from when the reciprocating movement in the main scanning direction Y by the head 40 is completed until the movement of the predetermined distance in the sub scanning direction X by the recording medium 5 placed on the platen 25 is started. This is referred to as “medium movement start time”. Further, the time from when the movement of the recording medium 5 placed on the platen 25 by a predetermined distance in the sub-scanning direction X is completed until the head 40 starts reciprocating movement in the main scanning direction Y is indicated. , Referred to as “head movement start time”. Although not shown here, the printer 100 has a home position (for example, the right end side of the guide rail 20) where the head 40 stands by. The completion of reciprocation in the main scanning direction Y by the head 40 means that the head 40 has reciprocated in the main scanning direction Y and arrived at the home position. In the present embodiment, the medium movement start time is different from the head movement start time. FIG. 6 is a timing chart showing the relationship between the moving speed of the head 40 and the moving speed of the recording medium 5. As shown in FIG. 6, here, the medium movement start time is the first time T1. The head movement start time is the second time T2. The second time T2 is longer than the first time T1. That is, the relationship between the first time T1 and the second time T2 is expressed as T1 <T2. The first time T1 and the second time T2 are stored in the storage unit 61 in advance.

  In the present embodiment, during printing, the second movement control unit 64 records on the platen 25 after the first time T1 has elapsed since the reciprocating movement in the main scanning direction Y by the head 40 has been completed. The second moving mechanism 52 is controlled to move the medium 5 in the sub-scanning direction X by a predetermined distance. Then, the first movement control unit 62 has passed the second time T2 since the second movement control unit 64 has moved the recording medium 5 placed on the platen 25 by a predetermined distance in the sub-scanning direction X. Later, the head 40 is reciprocated in the main scanning direction Y.

  Note that specific numerical values of the first time T1 that is the medium movement start time and the second time T2 that is the head movement start time are not particularly limited. For example, in the present embodiment, the storage unit 61 includes a first movement time when the first ink 6a is ejected and a head movement start time when the first ink 6a is ejected. A second one hour is stored in advance. The first hour is shorter than the second hour. For example, the first one hour is a medium movement start time set when only the first ink 6a is ejected to the recording medium 5 and the second ink 6b is not ejected. The second one hour is a head movement start time set when only the first ink 6a is ejected to the recording medium 5 and the second ink 6b is not ejected. Further, in the storage unit 61, a first two hours that is a medium movement start time when the second ink 6b is ejected, and a second head movement start time that is ejected when the second ink 6b is ejected. 2 hours are stored in advance. The first two hours are shorter than the second two hours. For example, the first two hours is a medium movement start time set when only the second ink 6b is ejected to the recording medium 5 and the first ink 6a is not ejected. The second 2 hours is a head movement start time set when only the second ink 6b is ejected to the recording medium 5 and the first ink 6a is not ejected.

  Further, in the present embodiment, the storage unit 61 stores in advance information related to the fixability between the recording medium 5 and the first ink 6a when the first ink 6a is ejected onto the recording medium 5. Yes. Further, in the storage unit 61, information on the fixability between the first ink 6a and the second ink 6b when the second ink 6b is ejected onto the first ink 6a ejected onto the recording medium 5. Is stored in advance. The information regarding the fixability is changed depending on the material of the recording medium 5 and the components contained in each of the first ink 6a and the second ink 6b.

  In the present embodiment, when the fixability between the recording medium 5 and the first ink 6a is lower than the fixability between the first ink 6a and the second ink 6b, as shown in FIG. When the layer of the first ink 6a and the layer of the second ink 6b are stacked in order from the bottom on the medium 5, the first one hour is set as the medium movement start time, and the head movement start time Is set for the second hour. At this time, the second movement control unit 64 moves the recording medium 5 placed on the platen 25 after the first one hour has elapsed after the reciprocation of the head 40 is completed. Then, the first movement control unit 62 starts the reciprocating movement of the head 40 after the second one hour has elapsed after the recording medium 5 placed on the platen 25 has moved a predetermined distance.

  On the other hand, when the fixability between the first ink 6a and the second ink 6b is lower than the fixability between the recording medium 5 and the first ink 6a, the first ink 6a is placed on the recording medium 5. When the layer and the layer of the second ink 6b are stacked in order from the bottom, the first 2 hours are set as the medium movement start time, and the second 2 hours are set as the head movement start time Is done. At this time, the second movement control unit 64 moves the recording medium 5 placed on the platen 25 after the first two hours have elapsed after the reciprocating movement of the head 40 is completed. Then, the first movement control unit 62 starts the reciprocating movement of the head 40 after the second two hours have elapsed after the recording medium 5 placed on the platen 25 has moved a predetermined distance.

  In the present embodiment, as shown in FIG. 6, when the second movement control unit 64 starts to move the recording medium 5 placed on the platen 25 in the sub-scanning direction X, the predetermined first acceleration A1. To start moving. The second movement control unit 64 stops the recording medium 5 moving in the sub-scanning direction X at a predetermined second acceleration A2. The absolute value of the first acceleration A1 is larger than the absolute value of the second acceleration A2. That is, the relationship between the first acceleration A1 and the second acceleration A2 is represented by | A1 |> | A2 |. The first acceleration A1 and the second acceleration A2 are stored in the storage unit 61 in advance. In addition, regarding the relationship between the first acceleration A1 and the second acceleration A2, the absolute value of the first acceleration A1 may be the same as the absolute value of the second acceleration A2, or the second acceleration A2 It may be smaller than the absolute value of.

In the present embodiment, in the example of FIG. 6, at time t _21, if the reciprocating movement in the main scanning direction Y of the head 40 is completed, at time t ₂₂ after a lapse of a first time T1 from the time t ₂₁ Then, the movement of the recording medium 5 placed on the platen 25 in the sub-scanning direction X is started. At this time, the first time T1 is, for example, 0.2 seconds. When the movement of the recording medium 5 in the sub-scanning direction X starts, the movement starts at the first acceleration A1. The recording medium 5 moving in the sub-scanning direction X is stopped at the second acceleration A2. For example, the time required from the start (time t _{22 in} FIG. 6) to the stop (time t _{25 in} FIG. 6) of the recording medium 5 placed on the platen 25 in the sub-scanning direction X is 0.6 seconds. If it is, the recording medium 5 is, 0.2 seconds is the time from the time _{t 22} to time _{t 23,} moves at a first acceleration A1. The recording medium 5 is, 0.1 seconds is the time from the time _{t 23} to time _{t 24,} moves at a constant speed, 0.3 seconds is the time from the time _{t 24} to time _{t 25,} the second Move at an acceleration A2. For example, if the time required to from the start to the stop of the movement in the sub-scanning direction X of the recording medium 5 placed on the platen 25 is 0.5 seconds, the time from the time t ₂₂ to time t ₂₃ 0 a .2 seconds, 0.1 seconds time from the time _{t 23} to time _{t 24,} and the time from the time _{t 24} to time _{t 25} may be 0.2 seconds.

Then, in the example of FIG. 6, at time t _25, the movement of a predetermined distance in the sub-scanning direction X of the recording medium 5 placed on the platen 25 is completed. Then at time t ₂₆ after a lapse of a second time T2 from the time t _25, reciprocates in the main scanning direction Y of the head 40 is started. At this time, for example, the second time T2 is 0.3 seconds.

  As described above, in the present embodiment, the main scanning of the head 40 is performed after the second time T2 has elapsed after the recording medium 5 placed on the platen 25 completes the movement of the predetermined distance in the sub-scanning direction X. A reciprocating movement in the direction Y is started. The second time T2 is the time from when the reciprocating movement in the main scanning direction Y by the head 40 is completed until the movement in the sub scanning direction X by the recording medium 5 placed on the platen 25 is started. It is longer than a certain first time T1. By the second time T2, a time for the vibration of the ink ejected to the recording medium 5 to converge is secured. Therefore, the printing of the next scan is started in a state where vibrations of the ink ejected onto the recording medium 5 have been reduced even a little. Therefore, distortion of the shape of the ink ejected to the recording medium 5 due to vibration of the ink ejected to the recording medium 5 can be suppressed.

  In the present embodiment, the second movement control unit 64 starts the movement at a predetermined first acceleration A1 when the movement of the recording medium 5 placed on the platen 25 is started. The second movement control unit 64 stops the recording medium 5 moving in the sub-scanning direction X at a predetermined second acceleration A2. Here, the absolute value of the first acceleration A1 is larger than the absolute value of the second acceleration A2. As a result, when the movement of the predetermined distance in the sub-scanning direction X by the recording medium 5 placed on the platen 25 is completed, it does not decelerate rapidly. Therefore, when the movement of the predetermined distance in the sub-scanning direction X by the recording medium 5 is completed, the vibration of the ink ejected to the recording medium 5 can be suppressed. Therefore, printing of the next scan is started in a state where the vibration of the ink ejected onto the recording medium 5 is more subdued. Accordingly, it is possible to further suppress distortion of the shape of the ink ejected to the recording medium 5.

  In the present embodiment, the first ink head 40a that discharges the first ink 6a is upstream of the second ink heads 40b to 40e that discharge the second ink 6b in the sub-scanning direction X, in other words, the return direction. It is arranged on the X2 side. As a result, a printed matter in which a layer made of the first ink 6a and a layer made of the second ink 6b are laminated on the recording medium 5 can be produced simply by moving the recording medium 5 in the direction X1. . Therefore, when printing is performed with a plurality of different types of ink being stacked, the time required for printing can be shortened. In the present embodiment, after the first ink 6a is ejected, the second ink 6b is placed on the first ink 6a after at least the first time T1 and the second time T2 have elapsed. Is discharged. Therefore, it is possible to secure as much time as possible for the first ink 6a to cure. Therefore, mixing of the first ink 6a and the second ink 6b can be suppressed.

  In the present embodiment, the second ink 6 b is ejected onto the first ink 6 a ejected to the recording medium 5. The time from when the movement of the predetermined distance in the sub-scanning direction X by the recording medium 5 placed on the platen 25 is completed until the movement of the head 40 in the main scanning direction Y starts is the second time. T2, reserved. As a result, the second ink 6b is ejected onto the first ink 6a in a state in which the vibration of the first ink 6a ejected onto the recording medium 5 is suppressed. As a result, a more beautiful printed matter can be produced.

  In the present embodiment, when the fixability between the recording medium 5 and the first ink 6a is lower than the fixability between the first ink 6a and the second ink 6b, the medium movement start time (first time) T1) is set to a first time that is a medium movement start time when the first ink 6a is ejected, and the first ink 6a is set to the head movement start time (second time T2). The second 1 hour, which is the head movement start time when discharging the ink, is set. On the other hand, when the fixability between the first ink 6a and the second ink 6b is lower than the fixability between the recording medium 5 and the first ink 6a, the medium movement start time (first time T1) is reached. Is set to the first two hours, which is the medium movement start time when discharging the second ink 6b, and the second ink 6b is discharged during the head movement start time (second time T2). The second 2 hours, which is the head movement start time at the time, is set. Thus, when the fixing property between the recording medium 5 and the first ink 6a is lower than the fixing property between the first ink 6a and the second ink 6b, the first one hour is the first two hours. Longer, the second hour is considered longer than the second two hours. On the other hand, when the fixability between the first ink 6a and the second ink 6b is lower than the fixability between the recording medium 5 and the first ink 6a, the first two hours are longer than the first one hour. Long, the second 2 hours are considered longer than the second 1 hour. Accordingly, when the fixability is low, the medium movement start time and the head movement start time, which are longer times, are set, so that it is possible to further suppress the distortion of the shape of the ink ejected to the recording medium 5.

  In the present embodiment, the first ink 6a is a base ink. The second ink 6b is an image forming ink. Thus, even in the case of producing a printed matter in which a layer formed by the base ink and a layer formed by the image forming ink are sequentially laminated on the recording medium 5 from below, the recording medium 5 can be prevented from being distorted in the shapes of the base ink and the image forming ink ejected onto the ink.

  The printer 100 according to the first embodiment has been described above. The printer according to the present invention is not limited to the printer 100 according to the first embodiment, and can be implemented in various other forms. Next, another embodiment will be briefly described. In the following description, the same reference numerals are used for the same configurations as those already described, and description thereof will be omitted as appropriate.

Second Embodiment
Next, the printer 200 according to the second embodiment will be described. FIG. 7 is a bottom view of the head 140 according to the second embodiment. In the present embodiment, as shown in FIG. 7, the head 140 includes a plurality of first ink heads 140b to 140e and a second ink head 140a. Here, the first ink 6a discharged from the first ink heads 140b to 140e is an image forming ink, for example, a process color ink. The second ink 6b discharged from the second ink head 140a is a base ink, for example, a white ink. In the present embodiment, compared to the first embodiment, the type of the first ink 6a and the type of the second ink 6b are reversed.

  In the main scanning direction Y, from the left, first ink heads 140b to 140e from which the first ink 6a as image forming ink is ejected, and second ink heads from which the second ink 6b as ground ink is ejected. The ink heads 140a to 140e are arranged in the carriage 30 so that they are arranged in the order of 140a. However, the order of arrangement of the ink heads 140a to 140e is not particularly limited. In the present embodiment, the plurality of first ink heads 140b to 140e are arranged at the same position in the sub-scanning direction X. In the present embodiment, the second ink head 140a is disposed in front of the plurality of first ink heads 140b to 140e. In the sub-scanning direction X, the second ink head 140a is provided on the side toward the going direction X1 from the plurality of first ink heads 140b to 140e. The rear end of the second ink head 140a is positioned in front of the front ends of the plurality of first ink heads 140b to 140e.

  In the present embodiment, an image forming ink layer that is the first ink 6 a and a base ink layer that is the second ink 6 b are laminated on the recording medium 5 in this order from the bottom. Here, the recording medium 5 is preferably formed of a transparent material.

  Note that the printing procedure by the printer 200 according to the present embodiment is the same as the printing procedure by the printer 100 according to the first embodiment, and a detailed description thereof will be omitted. Even in this embodiment, the medium movement start time is the first time T1 (see FIG. 6), and the head movement start time is the second time T2 (see FIG. 6). Therefore, the same effect as the first embodiment can be obtained. For example, the head movement start time is a second time T2 that is longer than the first time T1 that is the medium movement start time. Therefore, it is possible to suppress distortion of the shape of the ink ejected to the recording medium 5 due to the vibration of the ink ejected to the recording medium 5.

<Third Embodiment>
Next, a printer 300 according to the third embodiment will be described. For example, in the first embodiment, the first ink head 40a itself corresponds to the “first discharge portion” of the present invention, and the second ink heads 40b to 40e themselves correspond to the “second discharge portion” of the present invention. It was. Then, as shown in FIG. 4, the first ink head 40a is displaced in the sub-scanning direction X with respect to the plurality of second ink heads 40b to 40e. However, the first ink head 40a and the plurality of second ink heads 40b to 40e do not have to be shifted in the sub-scanning direction X.

  FIG. 8 is a bottom view of the head 240 according to the third embodiment. In the present embodiment, as shown in FIG. 8, the head 240 includes a first ink head 240a and a plurality of second ink heads 240b to 240e. Here, as in the first embodiment, the first ink 6a discharged from the first ink head 240a is a base ink, for example, a white ink. The second ink 6b ejected from the plurality of second ink heads 240b to 240e is an image forming ink, for example, a process color ink.

  In the present embodiment, the ink heads 240a to 240e are arranged in the main scanning direction Y. The plurality of ink heads 240a to 240e are arranged in a line in the main scanning direction Y. The plurality of ink heads 240a to 240e are not arranged so as to be shifted from each other in the sub-scanning direction X. The positions of the front ends of the ink heads 240a to 240e in the sub-scanning direction X are the same. Further, the positions of the rear ends of the ink heads 240a to 240e in the sub-scanning direction X are the same.

  In the present embodiment, a plurality of nozzles 42a are formed on the bottom surface of the first ink head 240a. A plurality of nozzles 42b are formed on the bottom surface of the second ink head 240b, a plurality of nozzles 42c are formed on the bottom surface of the second ink head 240c, and a plurality of nozzles 42d are formed on the bottom surface of the second ink head 240d. A plurality of nozzles 42e are formed on the bottom surface of the second ink head 240e. The plurality of nozzles 42 a to 42 e are arranged in a line in the sub-scanning direction X. However, the plurality of nozzles 42a to 42e may be arranged in a staggered manner in the sub-scanning direction X. Here, the rows of the plurality of nozzles 42a to 42e arranged in the sub-scanning direction X are referred to as nozzle rows 43a to 43e, respectively. In addition, among the nozzle rows 43a to 43e, the nozzle row arranged at the front is referred to as first nozzle rows 44a to 44e, respectively. Among the nozzle rows 43a to 43e, the nozzle rows arranged at the rear are referred to as second nozzle rows 45a to 45e, respectively.

  Each first nozzle row 44a to 44e is disposed in front of each second nozzle row 45a to 45e (specifically, upstream in the sub-scanning direction X). In each ink head 40a-40e, the front end of each second nozzle row 45a-45e is arranged behind the rear end of each first nozzle row 44a-44e. The number of nozzles 42a to 42e belonging to each of the first nozzle rows 44a to 44e and the number of nozzles 42a to 42e belonging to each of the second nozzle rows 45a to 45e are not particularly limited. In the present embodiment, the number of nozzles 42a to 42e belonging to each of the first nozzle rows 44a to 44e and the number of nozzles 42a to 42e belonging to each of the second nozzle rows 45a to 45e are the same. However, the number of nozzles 42a to 42e belonging to each of the first nozzle rows 44a to 44e may be larger or smaller than the number of nozzles 42a to 42e belonging to each of the second nozzle rows 45a to 45e. .

  In the present embodiment, the second nozzle row 45a of the first ink head 240a and the first nozzle rows 44b to 44e of the second ink heads 240b to 240e are used. Therefore, the first nozzle row 44a of the first ink head 240a and the second nozzle rows 45b to 45e of the second ink heads 240b to 240e may be omitted. Here, the first ink 6a (here, the base ink (for example, white ink)) is ejected from the nozzles 42a constituting the second nozzle row 45a of the first ink head 240a. The second ink 6b (here, image forming ink (for example, process color ink)) is ejected from the first nozzle rows 44b to 44e of the second ink heads 240b to 240e. In the present embodiment, the second nozzle row 45a of the first ink head 240a corresponds to the “first ejection portion” of the present invention. The first nozzle rows 44b to 44e of the second ink heads 240b to 240e correspond to the “second ejection part” of the present invention.

  Next, a procedure in which the printer 300 according to the present embodiment performs printing on the recording medium 5 will be described. In the present embodiment, similarly to the first embodiment, a layer formed by the base ink that is the first ink 6 a and the image forming ink that is the second ink 6 b are formed on the recording medium 5. Printed matter is produced by laminating the formed layers in order from the bottom.

  In the present embodiment, in the first scan, the first movement control unit 62 causes the motor 24 of the first movement mechanism 51 (see FIG. 2) so that the head 240 moves in the main scanning direction Y as shown in FIG. ) Is controlled. At this time, when the first ink head 240 a passes over the area of the recording medium 5 corresponding to the position of the first ink 6 a in the print image stored in the storage unit 61, the first ejection control unit 65 causes the platen 25. The first ink 6a is ejected from the second nozzle row 45a of the first ink head 240a onto the recording medium 5 placed on the recording medium 5. Thus, printing with the first ink 6a for the first scan is performed.

  Then, after the first reciprocation in the main scanning direction Y by the head 240 is completed, the second movement control unit 64 is placed on the platen 25 after the first time T1 (see FIG. 6) has elapsed. The drive of the motor 27 (see FIG. 2) of the second moving mechanism 52 is controlled so that the recording medium 5 is moved by a predetermined distance in the direction X1 in the sub-scanning direction X. At this time, the second movement control unit 64 starts the movement at the first acceleration A1 (see FIG. 6) when the movement of the recording medium 5 in the sub-scanning direction X is started. Further, when stopping the recording medium 5 moving in the sub-scanning direction X, the second movement control unit 64 stops at the second acceleration A2 (see FIG. 6) whose absolute value is smaller than the first acceleration A1. I am letting.

  Next, after the movement of the recording medium 5 in the sub-scanning direction X is completed and a second time T2 (see FIG. 6) longer than the first time T1 has elapsed, the first movement control unit 62 The next scan is performed by moving the head 240 in the main scanning direction Y by controlling the motor 24 of the first moving mechanism 51. At this time, when the first ink head 240 a passes over the area of the recording medium 5 corresponding to the position of the first ink 6 a in the print image stored in the storage unit 61, the first ejection control unit 65 causes the platen 25. The first ink 6a is ejected from the second nozzle row 45a of the first ink head 240a onto the recording medium 5 placed on the recording medium 5. At the same time, when the second ink heads 240b to 240e pass over the area of the recording medium 5 corresponding to the position of the second ink 6b in the print image, the second ejection control unit 66 records on the platen 25. The second ink 6b is ejected onto the medium 5 from the first nozzle rows 44b to 44e of the second ink heads 240b to 240e. In this way, the first ink 6a by the first discharge controller 65 is alternately performed while the movement of the head 240 in the main scanning direction Y and the movement of the recording medium 5 in the outgoing direction X1 in the sub-scanning direction X are alternately performed. And printing related to the second ink 6b by the second ejection control unit 66.

  Even in this embodiment, the same effects as those in the first embodiment and the second embodiment can be obtained. Even in the configuration of the head 240 as in the present embodiment, the layer of the first ink 6a and the second ink are formed on the recording medium 5 only by moving the recording medium 5 in the direction X1. It is possible to produce a printed material in which the layers according to 6b are laminated from below. Therefore, when printing is performed with a plurality of different types of ink being stacked, the time required for printing can be shortened.

<Fourth embodiment>
Next, a printer according to a fourth embodiment will be described. In the printer according to the fourth embodiment, the arrangement positions of the ink heads 240a to 240e are the arrangement positions of the ink heads 240a to 240e according to the third embodiment as shown in FIG. Therefore, detailed description regarding the arrangement positions of the ink heads 240a to 240e according to the present embodiment is omitted. As described above, the rows of the plurality of nozzles 42a to 42e in the ink heads 240a to 240e are referred to as nozzle rows 43a to 43e, respectively. Further, among the nozzle rows 43a to 43e, the nozzle rows arranged at the front part are referred to as first nozzle rows 44a to 44e, respectively, and the nozzle rows arranged at the rear part are respectively referred to as second nozzle rows 45a to 45e.

  In the present embodiment, unlike the third embodiment, the ink heads 240b to 240e are first ink heads, and the ink head 240a is a second ink head. Here, the first ink 6a discharged from the first ink heads 240b to 240e is an image forming ink, for example, a process color ink. The second ink 6b ejected from the second ink head 240a is a base ink, for example, a white ink. In the present embodiment, compared to the third embodiment, the type of the first ink 6a and the type of the second ink 6b are reversed.

  In the present embodiment, the second nozzle rows 45b to 45e of the first ink heads 240b to 240e and the first nozzle row 44a of the second ink head 240a are used. Therefore, in the present embodiment, the first nozzle rows 44b to 44e of the first ink heads 240b to 240e and the second nozzle row 45a of the second ink head 240a may be omitted. Here, the first ink 6a (here, image forming ink) is ejected from the second nozzle rows 45b to 45e of the first ink heads 240b to 240e, respectively. The second ink 6b (here, the base ink) is ejected from the nozzles 42a constituting the first nozzle row 44a of the second ink head 240a. In the present embodiment, the second nozzle rows 45b to 45e of the first ink heads 240b to 240e correspond to the “first ejection unit” of the present invention. The first nozzle row 44a of the second ink head 240a corresponds to the “second ejection portion” of the present invention.

  In this embodiment, as in the second embodiment, an image forming ink layer that is the first ink 6a and a base ink layer that is the second ink 6b are stacked on the recording medium 5 in order from the bottom. Is done. Here, the recording medium 5 is preferably formed of a transparent material.

  Note that the printing procedure by the printer according to the present embodiment is the same as the printing procedure by the printer 300 according to the third embodiment, and a detailed description thereof will be omitted. Even in this embodiment, the medium movement start time is the first time T1 (see FIG. 6), and the head movement start time is the second time T2 (see FIG. 6) longer than the first time T1. is there. Therefore, even in this embodiment, the same effects as those in the above embodiments can be obtained.

  As described above, the storage unit 61, the first movement control unit 62, the discharge control unit 63 (specifically, the first discharge control unit 65 and the second discharge control unit 66), and the second movement of the control device 60. The control unit 64 may be configured by software. In other words, each of the above units may be realized by a computer by reading the computer program into the computer. The present invention includes a computer program for printing for causing a computer to function as each of the above-described units. The present invention also includes a computer-readable recording medium on which the computer program is recorded. Each of the above units may be realized by a single processor included in the control device 60, or may be realized by a plurality of processors. Further, the present invention includes a circuit that realizes the same function as the program executed by each unit.

5 Recording medium 25 Platen 40 Head (ejection unit)
40a 1st ink head (1st discharge part)
40b-40e 2nd ink head (2nd discharge part)
DESCRIPTION OF SYMBOLS 51 1st movement mechanism 52 2nd movement mechanism 60 Control apparatus 61 Memory | storage part 62 1st movement control part 63 Discharge control part 64 2nd movement control part 65 1st discharge control part 66 2nd discharge control part 100 Printer (inkjet printer)

Claims (8)

A platen on which a recording medium is placed;
An ejection unit that ejects ink toward the platen;
A first movement mechanism for reciprocating the discharge unit in the main scanning direction;
A second moving mechanism for moving the recording medium placed on the platen in a sub-scanning direction orthogonal to the main scanning direction;
A controller that is electrically connected to the discharge unit, the first moving mechanism, and the second moving mechanism, and that controls the discharge unit, the first moving mechanism, and the second moving mechanism;
With
The control device includes:
A first movement control unit that controls the first movement mechanism to reciprocate the discharge unit in the main scanning direction;
An ejection control unit that ejects ink from the ejection unit while the ejection unit is moved in the main scanning direction by the first movement control unit;
The second moving mechanism is configured to move the recording medium placed on the platen by a predetermined distance in the sub-scanning direction after the discharge unit is reciprocated in the main scanning direction by the first movement control unit. A second movement control unit for controlling
With
The second movement control unit moves the recording medium placed on the platen in the sub-scanning direction after a predetermined first time has elapsed after the reciprocating movement in the main scanning direction by the ejection unit is completed. Move to
The first movement control unit moves the recording medium placed on the platen the predetermined distance in the sub-scanning direction by the second movement control unit, and then has a predetermined time longer than the first time. After the second time elapses, the ink jet printer reciprocates the ejection portion in the main scanning direction. When the recording medium placed on the platen starts to move, the second movement control unit starts to move at a predetermined first acceleration and moves in the sub-scanning direction. When stopping the medium, stop at the predetermined second acceleration,
The inkjet printer according to claim 1, wherein an absolute value of the first acceleration is larger than an absolute value of the second acceleration. The discharge part is
A first ejection unit that ejects the first ink;
A second ejection unit that ejects the second ink;
With
The first discharge unit is disposed upstream of the second discharge unit in the sub-scanning direction,
The discharge controller is
A first ejection control unit that ejects the first ink from the first ejection unit;
A second ejection control section for ejecting the second ink from the second ejection section;
An ink jet printer according to claim 1, comprising: The control device includes a first time that is the first time when the first ink is ejected and a second time that is the second time when the first ink is ejected. Time, a first two hours that is the first time when the second ink is ejected, and a second second time that is the second time when the second ink is ejected A storage unit that is stored in advance;
When the fixability between the recording medium and the first ink is lower than the fixability between the first ink and the second ink, the second movement control unit causes the reciprocating movement of the ejection unit. After the first one hour has elapsed since the completion, the recording medium placed on the platen is moved, and the first movement control unit is configured to move the recording medium placed on the platen After the second one hour has elapsed after moving the predetermined distance, the discharge unit is reciprocated,
When the fixability between the first ink and the second ink is lower than the fixability between the recording medium and the first ink, the second movement control unit causes the reciprocating movement of the ejection unit. After the first two hours have elapsed since completion, the recording medium placed on the platen is moved, and the first movement control unit is configured to move the recording medium placed on the platen 4. The inkjet printer according to claim 3, wherein the ejection unit is reciprocated after the second two hours have elapsed after moving the predetermined distance. The first ejection unit is a first ink head that ejects the first ink,
5. The inkjet printer according to claim 3, wherein the second ejection unit is a second ink head that ejects the second ink. 6. A first ink head and a second ink head arranged side by side in the main scanning direction;
The first ejection unit is a plurality of first nozzles that are formed on a bottom surface of the first ink head and eject the first ink.
The second ejection part is formed on the bottom surface of the second ink head on the downstream side in the sub-scanning direction with respect to the plurality of first nozzles, and the plurality of second nozzles ejects the second ink. The inkjet printer according to claim 3 or 4, wherein   The inkjet printer according to claim 3, wherein the first ink is a base ink, and the second ink is an image forming ink. The inkjet printer according to claim 3, wherein the first ink is an image forming ink, and the second ink is a base ink.

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