JP2020019156A - Ink ejection device and printing system - Google Patents

Abstract

To prevent the occurrence of failure of ink ejection from a nozzle by appropriately maintaining a line head.SOLUTION: An ink ejection device comprises a line head, a movement part, a maintenance device and a control part. The movement part moves the line head in a height direction (a Z-axis direction) of a recording medium, the height direction being a direction settled when a printing surface of the recording medium is defined as a front surface. The maintenance device includes a first unit movement part. When performing maintenance of the line head, the control part causes the movement part to move the line head in the Z-axis direction and in a direction in which the head separates from the recording medium. The control part causes the first unit movement part to move a unit for maintenance from a storage position toward a maintenance execution position.SELECTED DRAWING: Figure 16

Description

  The present invention relates to an ink ejection device that performs printing on a recording medium, and a printing system that performs printing using the ink ejection device and a printing plate.

  In some cases, printing is performed on a cloth material such as cloth or clothing. When printing a cloth material such as cloth or clothing, ink is applied to the cloth material. After the ink is applied to the cloth material, the ink is fixed. In some cases, printing of a cloth material is performed using an ink jet printing machine. Patent Document 1 describes an example of a technique for performing printing on a cloth material by an ink jet printing machine.

  Specifically, Patent Document 1 discloses a rigid frame, a first linear motion X-axis stage mounted on the frame, and a frame mounted parallel to the first linear motion X-axis stage and independent of the first linear motion X-axis stage. Linear motion X-axis stage that operates in parallel, a print table assembly movable on each linear X-axis stage, and a linear motion Y-axis mounted on the frame above the print table assembly and perpendicular to the linear X-axis stage A digital printing press is described that includes a stage and an array of inkjet nozzles mounted on a linear Y-axis stage for linear motion at right angles to the X-axis stage. With this configuration, the inkjet printing machine is moved in a direction perpendicular to the moving direction of the printing table assembly to print clothes (Patent Document 1: Claim 1, paragraphs [0041] and [0042]).

JP-T 2007-525339

  As described above, an ink jet printer may be used for printing. Ink jet printers spray ink on recording media. There is a merit that a detailed image can be easily printed as compared with the case where a plate is used. However, heads are generally expensive. In order to reduce the manufacturing cost, there is a serial type inkjet printing machine. This method uses a small head. In this method, the head moves in a direction perpendicular to the direction in which the recording medium is conveyed. With this movement, a line in the main scanning direction (a direction perpendicular to the transport direction) is drawn. Further, the recording medium is conveyed in the sub-scanning direction (conveying direction) in accordance with the reciprocation of the head. Thus, line drawing is repeated in the sub-scanning direction (transport direction). As a result, printing is performed on the flat surface of the recording medium.

  Some inkjet printers include a line head. The line head has a wider drawing width (width in the main scanning direction in which printing can be performed by one ink ejection) than a serial head. Usually, the drawing width of the line head is equal to or larger than the width of the printable recording medium in the main scanning direction. The time required for printing one line is shorter than in the serial method. The line head type ink jet printing machine has an advantage of high printing speed (productivity).

  The line head is usually fixed. The line head does not move. On the other hand, in an ink jet printer, it is necessary to periodically perform maintenance of a head (a nozzle for discharging ink). Without maintenance, some nozzles may not be able to eject ink. However, since the line head is fixed, there is a problem that maintenance is difficult.

  In the digital printing machine described in Patent Document 1, the moving direction of the inkjet nozzle is perpendicular to the transport direction. And it is a serial type ink jet printer. There is no description about the line head. Therefore, the technique described in Patent Document 1 cannot solve the above problem.

  The present invention has been made in view of the above-described problem, and appropriately performs maintenance of a line head of an ink ejection device to prevent a problem of ink ejection from a nozzle.

  In the ink ejection device according to the present invention, the recording medium is conveyed by the conveyance device, and can be added to and removed from a conveyance line provided with a plate device for printing using a plate. Alternatively, the ink discharge device is provided with a plate device for printing using a plate, and is fixed to a transport line of a recording medium transported by the transport device.

  The ink ejection device includes a line head, a moving unit, a maintenance device, and a control unit. The line head prints an image by discharging ink from nozzles onto a printing surface of the recording medium conveyed by the conveyance device based on the image data for ink printing. The moving unit moves the line head in a Z-axis direction, which is a height direction when a printing surface of the recording medium faces the front. The maintenance device is provided outside the line head in an X-axis direction that is a direction perpendicular to a transport direction of the recording medium when the printing surface of the recording medium is facing the front. The maintenance device includes a first unit moving unit that moves the maintenance unit between a storage position and a maintenance execution position. The maintenance execution position is a position below the ejection surface of the line head where the nozzles are exposed and ejects ink, and the maintenance unit performs maintenance. When performing maintenance on the line head, the control unit moves the line head to the moving unit in the Z-axis direction and in a direction away from the recording medium. The control unit moves the maintenance unit to the first unit moving unit from the accommodation position to the maintenance execution position.

  According to the present invention, the maintenance of the line head of the ink ejection device can be appropriately performed. In the ink ejection device including the line head, it is possible to prevent the occurrence of the problem of the ink ejection of the nozzle. An ink ejection device that can maintain high image quality can be provided.

FIG. 1 illustrates an example of a printing system according to an embodiment. FIG. 1 illustrates an example of a printing system according to an embodiment. FIG. 1 illustrates an example of a printing system according to an embodiment. FIG. 4 is a diagram illustrating an example of a unit print range according to the embodiment. FIG. 3 is a diagram illustrating an example of an installation position of the ink ejection device according to the embodiment. FIG. 2 is a diagram illustrating an example of an ink ejection device according to the embodiment. FIG. 3 is a diagram illustrating an example of a line head according to the embodiment. FIG. 3 is a diagram illustrating an example of a head according to the embodiment. FIG. 3 is a diagram illustrating an example of a head according to the embodiment. 2 shows an example of a moving unit according to the embodiment. It is a figure showing an example of the maintenance device concerning an embodiment. It is a figure showing an example of a cap unit concerning an embodiment. It is a figure showing an example of the wipe unit concerning an embodiment. It is a figure showing an example of the expulsion unit concerning an embodiment. It is a figure showing an example of movement of the unit for maintenance concerning an embodiment. FIG. 6 is a diagram illustrating an example of a flow of mounting a cap unit on a line head according to the embodiment. It is a figure showing an example of a flow of a wipe using a wipe unit concerning an embodiment. FIG. 6 is a diagram illustrating an example of a flow of ink ejection using the ejection unit according to the embodiment. 4 shows an example of the flow of inputting image data for ink printing to the ink ejection device according to the embodiment. FIG. 6 is a diagram illustrating an example of a division process of the information processing apparatus according to the embodiment. FIG. 4 is a diagram illustrating an example of data stored in an information storage unit according to the embodiment. FIG. 9 is a diagram illustrating an example of a flow of a display process of the information processing apparatus according to the embodiment. It is a figure showing an example of the division setting screen concerning an embodiment. FIG. 4 is a diagram illustrating an example of a mode setting in the ink ejection device according to the embodiment. FIG. 4 is a diagram illustrating an example of printing in a normal mode according to the embodiment. FIG. 4 is a diagram illustrating an example of printing in a head movement mode according to the embodiment. An example of position setting at the time of starting printing of the line head according to the embodiment will be described. It is a figure showing an example of a floating sensor concerning an embodiment. It is a figure showing an example of a floating sensor concerning an embodiment. It is a figure showing an example of recognition of a position of a floating part of a control part concerning an embodiment. It is a figure showing an example of the adjustment moving part concerning an embodiment. It is a figure showing an example of the adjustment moving part concerning an embodiment. 4 shows an example of a head retreat flow according to the embodiment. 4 shows an example of a retreat of a head according to the embodiment in column units. FIG. 2 is a diagram illustrating an example of a portion related to photographing of a printing surface in the printing system according to the embodiment. FIG. 6 is a diagram illustrating an example of a flow of an automatic image addition mode according to the embodiment. FIG. 4 is a diagram illustrating an example of a flow of a copy mode according to the embodiment.

  Hereinafter, an example of the ink ejection device 1 and the printing system 100 according to the embodiment and the modified example will be described with reference to FIGS. 1 to 37.

  The ink ejection device 1 and the printing system 100 perform printing on the recording medium 7. In the following description, cloth will be described as an example of the recording medium 7. However, the recording medium 7 is not limited to cloth. The recording medium 7 may be, for example, paper or film (resin). What can be printed by the ink discharge device 1 and the plate device 2 can be the recording medium 7.

  Further, in the following description, a direction perpendicular to the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front is referred to as an X-axis direction. The transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front is referred to as a Y-axis direction. The height direction (front-back direction) when the printing surface 71 of the recording medium 7 is set to the front is referred to as a Z-axis direction.

(Ink ejection device 1 and printing system 100)
An example of the ink ejection apparatus 1 and the printing system 100 according to the embodiment will be described with reference to FIGS. 1 to 3 are diagrams illustrating an example of a printing system 100 according to the embodiment. FIG. 4 is a diagram illustrating an example of a unit print range according to the embodiment.

  The printing system 100 prints the recording medium 7. The printing system 100 includes at least an ink ejection device 1, a plate device 2, and a transport device 3. The printing system 100 is a hybrid printing system 100 that can perform both printing using a plate and printing using an inkjet. Further, the printing system 100 may include a control device 4, a supply device 5, a fixing device 6a, and a cleaning device 6b.

  The transport device 3 transports the recording medium 7. The plate device 2 is provided on a line (transport line) of the recording medium 7 transported by the transport device 3. The ink ejection device 1 can be added to and removed from the transport line. For example, the ink ejection device 1 can be added to the installed transport line (the transport device 3) and the plate device 2. In addition, of the plate devices 2 already installed, some of the plate devices 2 may be removed, and the ink ejection device 1 may be provided instead. Further, the installed ink ejection device 1 can be removed from the transport line. The ink ejection device 1 is detachable from the plate device 2 and the transport line. Thus, only the ink ejection device 1 that performs digital printing can be supplied to the market.

  Further, the ink ejection device 1 may be fixed with respect to the transport line. The ink ejection device 1 does not have to be removable from the plate device 2 and the transport device 3 (transport line). In this case, the plate device 2, the transport device 3, and the ink discharge device 1 are sold as a set. A complete printing system 100 including an ink ejection device 1 for performing digital printing and a plate device 2 for performing analog printing can be supplied to the market.

  The control device 4 controls the ink discharge device 1, the plate device 2, the transport device 3, the supply device 5, the fixing device 6a, and the cleaning device 6b. The supply device 5 supplies the recording medium 7 during printing. When the recording medium 7 is a cloth, for example, a cloth roll (a cloth wound in a cylindrical shape) is set in the supply device 5. The supply device 5 includes a supply roller 51 and a supply motor 52. The supply roller 51 sends out the recording medium 7. A plurality of supply rollers 51 may be provided. During printing, the control device 4 rotates the supply motor 52. The supply motor 52 rotates each supply roller 51.

  The transport device 3 includes a transport belt 31, a driving roller 32, a driven roller 33, and a transport motor. The transport belt 31 is wrapped around a driving roller 32 and a driven roller 33. The transport motor 34 rotates the drive roller 32. The conveyance belt 31 rotates in accordance with the rotation of the driving roller 32. The transport belt 31 contacts the recording medium 7. The recording medium 7 is stretched on the transport belt 31. The recording medium 7 is transported along with the rotation of the transport belt 31. At the time of printing, the control device 4 rotates the transport motor 34. Then, the control device 4 causes the transport belt 31 to rotate.

  The plate device 2 performs printing using the plate. The recording medium 7 passes under the plate device 2. For example, the plate apparatus 2 performs screen printing on the recording medium 7. One plate device 2 can print one color image (design). As shown in FIGS. 2 and 3, the number of plate devices 2 is not limited to one. A plurality of plate devices 2 can be provided. The number of the plate devices 2 is equal to the number of colors to be printed on the plate. 2 and 3 show an example in which three plate devices 2 are provided. However, more than three plate units 2 may be provided. The number of plate units 2 may be less than three.

  Each plate device 2 includes a mold 21, a screen plate 22, a squeegee 23, a squeegee moving device 24, and a lifting device 25. The lifting device 25 raises and lowers the formwork 21. The screen plate 22 is set in the mold 21. The squeegee moving device 24 is attached to the formwork 21. The squeegee 23 is attached to the squeegee moving device 24. The screen plate 22 is, for example, made of fiber, resin, or metal. The portion of the screen plate 22 where ink (color paste) is applied to the recording medium 7 is made to transmit the ink by plate making such as exposure and development. The squeegee 23 has a spatula shape. The squeegee 23 is located on the screen plate 22. A lower end portion (a spatula portion) of the squeegee 23 contacts the screen plate 22.

  Color paste (ink) is placed on the screen plate 22. The color of the color paste used in each plate device 2 is different. The squeegee moving device 24 reciprocates the squeegee 23 within the mold 21. The moving direction is the longitudinal direction of the mold 21 (the direction perpendicular to the X-axis direction and the Y-axis direction). During the reciprocating movement, the squeegee 23 rubs the upper surface of the screen plate 22. The squeegee moving device 24 includes, for example, a motor. By moving the squeegee 23 back and forth, the color paste is pushed out from the ink transmitting portion of the screen plate 22. The color paste is extruded onto the recording medium 7. For example, the plate device 2 can be used for printing a solid portion.

  Since the plate device 2 is used, the control device 4 causes the transport device 3 to repeatedly transport and stop the recording medium 7. The control device 4 causes the transport device 3 to stop transporting the recording medium 7 each time the recording medium 7 is transported in the Y-axis direction by the specified distance F1. After the stop, the control device 4 lowers the mold 21 to the elevating device 25 until the screen plate 22 and the recording medium 7 come into contact with each other. Thereafter, the control device 4 causes the squeegee 23 to reciprocate to the squeegee moving device 24. Thereby, the textile printing of the recording medium 7 is performed. After textile printing, the control device 4 raises the mold 21 until the screen plate 22 and the recording medium 7 are separated. After the completion of the ascent of the mold 21 (the screen plate 22), the control device 4 resumes the conveyance of the recording medium 7 by the specified distance F1. In this manner, by repeating a series of processes (stopping the conveyance, lowering the mold 21 and the like, reciprocating the squeegee 23, raising the mold 21 and the like, and restarting the conveyance), the printing on the recording medium 7 by the printing plate is repeated.

  For example, the specified distance F1 is equal to or less than the length of the screen plate 22 in the Y-axis direction or the same. In other words, the length in the Y-axis direction that can be printed on the screen plate 22 can be the specified distance F1. When a plurality of plate devices 2 are provided, the distance between the screen plate 22 of the upstream plate device 2 and the screen plate 22 of the downstream plate device 2 can be set to the specified distance F1. Thereby, the recording medium 7 can be printed without a gap.

  A strip-shaped area of the recording medium 7 corresponding to a specified distance F1 in the Y-axis direction is one printing unit. Hereinafter, this print unit is referred to as a unit print range E1 (see FIG. 4). The length of the unit print range E1 in the Y-axis direction is a specified distance F1. The length of the unit print range E1 in the X-axis direction (the direction perpendicular to the transport direction) is the width of the recording medium 7 in the X-axis direction. Note that the recording medium 7 may be transported one by one. In this case, the unit print range E1 is one recording medium 7.

  In addition, the plate apparatus 2 is not limited to the one using the mold 21. The plate apparatus 2 may perform printing using a cylindrical tube (rotary screen printing). Further, the plate apparatus 2 may be an apparatus that performs printing (textile printing) by applying a color paste to a concave portion of an intaglio copper roll.

  The ink ejection device 1 prints the conveyed recording medium 7 with ink. The ink ejection device 1 includes a line head 8 that ejects ink. The ink ejection device 1 is a type of an inkjet printer. The ink ejection device 1 can also print the recording medium 7 being conveyed. In a conventional line head type 8 printer, the line head 8 is fixed. On the other hand, the ink ejection device 1 can move the line head 8 in the Y-axis direction and the Z-axis direction (details will be described later). The ink discharge device 1 can perform printing on the recording medium 7 in the stopped state.

  One printing range (printing unit) of the ink ejection device 1 is a unit printing range E1. This is the same as the printing range (area) of the screen plate 22. The recording medium 7 is supplied continuously. Therefore, the ink discharge device 1 repeats printing of the unit print range E1. The ink discharge device 1 discharges ink to a portion where the plate device 2 does not print, for example. In the recording medium 7, a pattern using a plurality of colors or a pattern including gradation can be printed by the ink ejection device 1. FIG. 4 shows an example of the unit print range E1. In FIG. 4, an area of the recording medium 7 separated by a two-dot chain line is a unit print range E1.

  The recording medium 7 that has passed through the conveyor belt 31 enters the fixing device 6a. The fixing device 6a includes, for example, a fixing and conveying roller 61, a fixing and conveying motor 62, and a heater 63. At the time of printing, the control device 4 rotates the fixing conveyance motor 62 in accordance with the conveyance of the recording medium 7 by the conveyance device 3. Thereby, the control device 4 causes the recording medium 7 to be conveyed in the fixing device 6a. At the time of printing, the control device 4 supplies electric power to the heater 63. The ink is fixed on the recording medium 7 by heating by the heater 63.

  The recording medium 7 after the fixing is carried into the cleaning device 6b. The cleaning device 6b includes, for example, a cleaning / conveying roller 64, a cleaning / conveying motor 65, and a cleaning machine 66. At the time of printing, the control device 4 rotates the cleaning / conveying motor 65 in accordance with the conveyance of the recording medium 7 of the conveyance device 3 and the fixing device 6a. Thus, the control device 4 causes the recording medium 7 to be transported in the cleaning device 6b. At the time of printing, the control device 4 causes the cleaning device 6b to clean the recording medium 7. The cleaning device 6b sprays water on the recording medium 7. The cleaning device 6b rinses out excess (unfixed) ink and color paste. The washed recording medium 7 is discharged outside the apparatus. The discharged recording medium 7 is stored in the storage container 67.

(Installation position of the ink ejection device 1)
Next, an example of an installation position of the ink ejection device 1 according to the embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of an installation position of the ink ejection device 1 according to the embodiment.

  FIG. 5 is a schematic view of the recording medium 7, the transport device 3 (the transport belt 31), and the plate device 2 as viewed from above. The ink ejection device 1 and each plate device 2 are provided on a transport belt 31. As shown in the uppermost diagram in FIG. 5, the ink ejection device 1 may be provided on the upstream side of each plate device 2 in the Y-axis direction (transport direction). As shown in the middle part of FIG. 5, the ink ejection device 1 may be provided downstream of all the plate devices 2 in the Y-axis direction. Further, as shown in the lowermost diagram in FIG. 5, the ink discharge device 1 may be provided between the plurality of plate devices 2 in the Y-axis direction.

  By simply adding the ink ejection device 1 to the printing system 100 using the existing plate, it is possible to realize the printing system 100 having the advantages of the plate device 2 and the ink ejection device 1. The installation location of the ink ejection device 1 is not particularly limited. Therefore, the printing system 100 according to the embodiment can be installed without significantly modifying existing printing equipment.

(Ink ejection device 1)
Next, an example of the ink ejection device 1 according to the embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of the ink ejection device 1 according to the embodiment.

  The ink ejection device 1 includes a control unit 10. The control unit 10 controls the operation of the ink ejection device 1. The control unit 10 is a substrate. The control unit 10 includes a control circuit 10a and an image processing circuit 10b. The control circuit 10a is, for example, a CPU. The control circuit 10a performs processing based on a control program and control data stored in the storage unit 11. The storage unit 11 includes a nonvolatile storage device such as a ROM, an HDD, and a flash ROM. The storage unit 11 includes a volatile storage device such as a RAM. The image processing circuit 10b performs image processing on the ink printing image data D2 used for printing.

  The ink ejection device 1 includes a line head 8. The line head 8 discharges ink from the nozzles 81 onto the printing surface 71 of the recording medium 7 transported by the transport device 3 based on the image data D2 for ink printing (see FIG. 19). The line head 8 prints an image. A line head 8 is provided for each ink color to be used. The ink ejection device 1 includes a black line head 8, a yellow line head 8, a cyan line head 8, and a magenta line head 8 (see FIG. 7). FIG. 6 shows only one line head 8 for convenience. Note that the number of line heads 8 included in the ink ejection device 1 may be only one for one color. In this case, the ink ejection device 1 functions as a printing device for monochrome printing. Further, the number of line heads 8 included in the ink ejection device 1 may be smaller than four. The number of line heads 8 can be determined according to the number of colors used by the user.

  The line head 8 includes a plurality of heads 8a. The head 8a includes a plurality of nozzles 81 (nozzle rows 80) arranged in a row. Ink is ejected from the nozzle 81 of the head 8a. For example, when the line heads 8 for four colors are included, black, yellow, cyan, and magenta inks can be ejected. Further, the ink discharge device 1 includes a plurality of ink tanks 13. The ink tank 13 is provided for each color. FIG. 6 shows only one ink tank 13 for convenience. The ink is filled in the ink tank 13. From each ink tank 13, ink of a color corresponding to each head 8a is supplied. The ink is supplied to each head 8a using the head difference. The control unit 10 causes the line head 8 (each head 8a) to print an image. Based on the ink print image data D2 (ink discharge image data), the control unit 10 discharges ink from each nozzle 81 of the head 8a to the print surface 71 of the recording medium 7.

  Further, the ink ejection device 1 includes a moving unit 12. The moving unit 12 can move the line head 8 in two axial directions. The moving unit 12 includes a Z-axis moving mechanism 12z and a Y-axis moving mechanism 12y. The Z-axis moving mechanism 12z moves the line head 8 in the Z-axis direction. The Y-axis moving mechanism 12y moves the line head 8 in the Y-axis direction. The control unit 10 controls the moving unit 12. That is, the control unit 10 controls the position of the line head 8.

  The speed sensor 10d is a sensor for detecting the transport speed of the recording medium 7 (moving speed in the Y-axis direction). For example, the speed sensor 10d irradiates the recording medium 7 with laser light, microwaves, ultrasonic waves, or the like. The speed sensor 10d measures the speed from the frequency change of the reflected wave of the recording medium 7. The speed sensor 10d inputs a signal indicating the measured speed to the control unit 10. The control unit 10 recognizes the transport speed of the recording medium 7 based on the output of the speed sensor 10d. When printing is performed only on the stopped recording medium 7, the speed sensor 10d may not be provided.

  Further, the ink ejection device 1 includes a floating sensor 14. The floating sensor 14 detects a floating portion of the conveyed recording medium 7. The output of the floating sensor 14 is input to the control unit 10. Based on the output of the floating sensor 14, the control unit 10 recognizes a floating portion of the conveyed recording medium 7.

  The ink ejection device 1 includes a maintenance device 9. The maintenance device 9 is a device for preventing and eliminating clogging of the nozzle 81. The maintenance device 9 includes a maintenance unit 90, a first unit moving unit 91, and a second unit moving unit 92. Details of the maintenance device 9 will be described later.

  The ink ejection device 1 includes an operation panel 15. The operation panel 15 includes a display panel 15a and a touch panel 15b. The display panel 15a displays a setting screen and information. The display panel 15a displays operation images such as keys, buttons, and tabs. Touch panel 15b detects a touch operation on display panel 15a. The control unit 10 recognizes the operated operation image based on the output of the touch panel 15b. The control unit 10 recognizes a setting operation performed by the user.

  Further, the ink ejection device 1 includes a timing sensor 16. The timing sensor 16 is a sensor for knowing that the head of the unit print range E1 (recording medium 7) has entered the printable range of the ink ejection device 1 (head 8a). For example, a mark indicating the boundary of the unit print range E1 is written on the transport belt 31. A mark is written for each boundary of the unit print range E1. The mark indicates the end position of the front unit print range E1. The mark indicates the head position of the rear unit print range E1. The timing sensor 16 reads the mark. The output of the timing sensor 16 is input to the control unit 10. Based on the output of the timing sensor 16, the control unit 10 determines the print start timing.

  The communication unit 19 communicates with the information processing device 200 (computer). The information processing device 200 is, for example, a PC or a server. The communication unit 19 receives the image data D2 for ink printing from the information processing device 200. The control unit 10 moves the line head 8 based on the image data D2 for ink printing. Further, the control unit 10 causes each head 8a to eject ink based on the image data D2 for ink printing.

(Line head 8)
Next, an example of the line head 8 according to the embodiment will be described with reference to FIGS. FIG. 7 is a diagram illustrating an example of the line head 8 according to the embodiment. 8 and 9 are diagrams illustrating an example of the head 8a according to the embodiment.

  FIG. 7 is a view of the line head 8 as viewed from below. As shown in FIG. 7, a plurality of line heads 8 are provided. Each line head 8 is provided side by side in the Y-axis direction. For example, a yellow line head 8, a cyan line head 8, a magenta line head 8, and a black line head 8 are provided in this order from the upstream side in the transport direction of the recording medium 7. Note that the order of the colors is not limited to the above example.

  As shown in FIG. 7, one line head 8 includes a plurality of heads 8a. FIG. 7 shows an example in which seven heads 8a are arranged in the main scanning direction for each color. The heads 8a are provided in a staggered manner in the X-axis direction. The heads 8a are provided such that adjacent heads 8a in the X-axis direction are displaced from each other in the Y-axis direction. Some of the nozzles 81 arranged at the end of each head 8a overlap each other when viewed from the Y-axis direction. In the example of FIG. 7, the line heads 8 for each color include four heads 8a located on the upstream side and three heads 8a located on the downstream side.

  As shown in FIG. 8, each head 8a includes one nozzle row 80. Each nozzle row 80 includes a plurality of nozzles 81. The nozzle row 80 has a plurality of nozzles 81 arranged in a row. The number of nozzles 81 included in the nozzle row 80 of each head 8a is the same. The nozzles 81 are formed so that the intervals between the adjacent nozzles 81 are equal. The nozzles 81 are arranged in the X-axis direction (the direction perpendicular to the transport direction of the recording medium 7). In other words, the heads 8a are arranged so that the nozzle rows 80 are parallel to the X-axis direction.

  Ink is ejected from the opening of the nozzle 81. One driving element 83 is provided for the nozzle 81. The drive element 83 is, for example, a piezo element (piezoelectric element). As shown in FIG. 9, the head 8a includes a plurality of driver circuits 82. The driver circuit 82 turns ON / OFF voltage application to each drive element 83. The control unit 10 supplies image data for ink ejection (data indicating the nozzles 81 to eject ink) to each driver circuit 82 for each line. The driver circuit 82 applies a pulse-like voltage to the driving element 83 of the nozzle 81 from which ink is to be ejected. The driving element 83 is deformed by applying a voltage. The deformation pressure is applied to a flow path (not shown) for supplying ink to the nozzle 81. The ink is ejected from the nozzle 81 by the pressure to the flow path. On the other hand, the driver circuit 82 does not apply a voltage to the driving element 83 corresponding to a pixel that does not eject ink. The driver circuit 82 actually controls ink ejection.

  The head 8a includes a voltage generation circuit 84 that generates a plurality of types of voltages having different magnitudes. The driver circuit 82 applies one of the voltages generated by the voltage generation circuit 84 to the drive element 83. The greater the applied voltage, the greater the deformation of the drive element 83. As a result, the amount of ejected ink droplets increases. The smaller the applied voltage is, the smaller the deformation of the driving element 83 is. As a result, the amount of ejected ink droplets is reduced. The driver circuit 82 can adjust the amount of the ejected ink droplet.

  Further, the control unit 10 includes a drive signal generation circuit 10c. The drive signal generation circuit 10c generates a drive signal S1. The drive signal S1 is a signal for driving the head 8a. The drive signal generation circuit 10c generates, for example, a clock signal. The head 8a (driver circuit 82) discharges ink every time the drive signal S1 rises (or falls) once. A reference cycle of ink ejection is determined in advance. The control unit 10 causes the drive signal generation circuit 10c to generate a drive signal S1 having a frequency at which ink is ejected in the reference cycle.

(Moving unit 12)
Next, an example of the moving unit 12 according to the embodiment will be described with reference to FIGS. FIG. 10 illustrates an example of the moving unit 12 according to the embodiment.

  The Z-axis moving mechanism 12z moves the head 8a in the Z-axis direction. The Z-axis moving mechanism 12z includes a Z-axis arm z1. The Z-axis arm z1 is a quadrangular prism-shaped member. The Z-axis arm z1 incorporates a Z-axis motor z2, a Z-axis moving member z3, and a Z-axis moving body z4. The Z-axis motor z2 is, for example, a stepping motor. The Z-axis motor z2 can rotate in both forward and reverse directions. The control unit 10 controls the rotation of the Z-axis motor z2. The Z-axis motor z2 rotates the Z-axis moving member z3. The Z-axis moving member z3 is, for example, a ball screw. The Z-axis moving body z4 is integrated with a nut attached to a ball screw. The Z-axis motor z2 rotates the Z-axis moving member z3. Thereby, the rotational motion of the Z-axis motor z2 is converted into a linear motion. As a result, the Z-axis moving body z4 moves in the Z-axis direction. The Z-axis arm z1 guides the movement of the Z-axis moving body z4.

  The Y-axis moving mechanism 12y moves the head 8a in the X-axis direction. The Y-axis moving mechanism 12y includes a Y-axis arm y1. The Y-axis arm y1 is a quadrangular prism-shaped member. The Y-axis arm y1 incorporates a Y-axis motor y2, a Y-axis moving member y3, and a Y-axis moving body y4. The Y-axis motor y2 is, for example, a stepping motor. The Y-axis motor y2 can rotate in both forward and reverse directions. The control unit 10 controls the rotation of the Y-axis motor y2. The Y-axis motor y2 rotates the Y-axis moving member y3. The Y-axis moving member y3 is, for example, a ball screw. The Y-axis moving body y4 is integrated with a nut attached to a ball screw. The Y-axis motor y2 rotates the Y-axis moving member y3. Thereby, the rotational motion of the Y-axis motor y2 is converted into a linear motion. As a result, the Y-axis moving body y4 moves. The Y-axis arm y1 guides the movement of the Y-axis moving body y4.

  Further, an X-axis arm 12x for holding each line head 8 is provided. The longitudinal direction of the X-axis arm 12x is the X-axis direction. Each line head 8 is attached below the X-axis arm 12x. In other words, each line head 8 is suspended from the X-axis arm 12x.

  The Z-axis moving body z4 is connected to a part of the Y-axis moving mechanism 12y. For example, the end of the Y-axis arm y1 is connected to the Z-axis moving body z4. The line head 8 moves in the Z-axis direction in accordance with the movement of the Z-axis moving body z4. The line head 8 (head 8 a) can be moved closer to or farther from the recording medium 7. By rotating the Z-axis motor z2, the control unit 10 can change the height (position in the Z-axis direction) of the line head 8 (nozzle 81).

  The Y-axis moving body y4 is connected to the X-axis arm 12x. For example, a part of the X-axis arm 12x is connected to the Y-axis moving body y4. The head 8a moves in the Y-axis direction in accordance with the movement of the Y-axis moving body y4. The position of the line head 8 in the Y-axis direction with respect to the recording medium 7 can be changed. By rotating the Y-axis motor y2, the control unit 10 can move the ink discharge position (print position) by the head 8a (nozzle 81) in the Y-axis direction.

(Maintenance device 9)
Next, an example of the maintenance device 9 according to the embodiment will be described with reference to FIGS. 3 and 11 to 15. FIG. 11 is a diagram illustrating an example of the maintenance device 9 according to the embodiment. FIG. 12 is a diagram illustrating an example of the cap unit 93 according to the embodiment. FIG. 13 is a diagram illustrating an example of the wipe unit 94 according to the embodiment. FIG. 14 is a diagram illustrating an example of the discharge unit 95 according to the embodiment. FIG. 15 is a diagram illustrating an example of movement of the maintenance unit 90 according to the embodiment.

  As shown in FIG. 3, the maintenance device 9 has a box-shaped housing. As shown in FIG. 3, the maintenance device 9 is provided outside the line head 8 in the X-axis direction. The maintenance device 9 is provided outside the recording medium 7 (transport line) on the XY plane.

  As shown in FIG. 11, the maintenance device 9 includes a cap unit 93, a wipe unit 94, and a discharge unit 95 as a maintenance unit 90. The maintenance device 9 includes a first unit moving unit 91 and a second unit moving unit 92.

  FIG. 12 shows an example of the cap unit 93. The cap unit 93 includes a plurality of caps 9a. Specifically, the cap unit 93 is a plate-like member having a plurality of caps 9a provided on a plane (upper surface). One cap 9a is provided for one head 8a. One line head 8 includes seven heads 8a. Line heads 8 for four colors are provided. Therefore, the cap unit 93 includes 28 caps 9a.

  Each cap 9a is a member obtained by coating a sheet metal with rubber. The shape of the cap 9a is concave. Each cap 9a is fixed to the cap unit 93. The ejection surface of the head 8a is fitted into the cap 9a. By fitting the cap 9a, the ejection surface (nozzle 81) is sealed. Drying and evaporation of the ink in each head 8a can be prevented.

  FIG. 13 shows an example of the wipe unit 94. The wipe unit 94 includes a plurality of wipe members. The wipe unit 94 is a plate-shaped member provided with a plurality of wipe members on a plane (upper surface). Specifically, the wiping member is a blade 9b provided for each head 8a. The member for wiping is not limited to the blade 9b.

  The blade 9b is, for example, a resin or rubber plate. One blade 9b is provided for one head 8a. Therefore, the wipe unit 94 includes 28 blades 9b. The upper end of the blade 9b contacts the ejection surface (lower surface) of each head 8a. The blade 9b moves in the X-axis direction. The tip of the nozzle 81 is rubbed by the blade 9b. This makes it possible to forcibly scrape dust adhered to the nozzle 81 and ink whose viscosity has increased due to drying.

  The wipe unit 94 includes a wipe motor 96 as a blade moving unit. The blade moving unit moves the blade 9b in parallel with the nozzle row 80. To move the blades 9b, a wipe motor 96 is provided for each blade 9b. At the time of wiping (when rubbing the nozzle 81), the control unit 10 operates the wipe motor 96. On the upper surface of the wipe unit 94, a groove is provided for each blade 9b. The groove is parallel to the X-axis direction. The groove guides the movement of the blade 9b. The width of the groove in the X-axis direction is longer than or equal to the width of the nozzle row 80 in the X-axis direction.

  FIG. 14 shows an example of the discharge unit 95. The ejection unit 95 includes a plurality of ink absorbers 9c. The ink absorber 9c is, for example, a sponge. Specifically, the discharge unit 95 is a plate-shaped member provided with a plurality of ink absorbers 9c on a plane (upper surface). One ink absorber 9c is provided for one head 8a. Therefore, the cap unit 93 includes 28 ink absorbers 9c. The ink absorber 9c may be spread over the entire flat surface (upper surface) of the discharge unit 95.

  Each ink absorber 9c is fixed to the discharge unit 95. An ink absorber 9c is arranged below the ejection surface of the head 8a. The ink absorber 9c receives the ink discharged from the head 8a. The discharged ink does not leak from the discharge unit 95. The maintenance device 9 is not stained by the discharged ink.

  The first unit moving section 91 moves the maintenance unit 90 between the accommodation position and the maintenance execution position. The maintenance execution position is a position below the ejection surface of the line head 8 where the maintenance unit 90 performs maintenance. The ejection surface is a surface of the line head 8 from which the nozzles 81 are exposed to eject ink.

  The second unit moving section 92 vertically moves the used unit, which is the maintenance unit 90 to be used, to a position where it can be moved below the ejection surface. As shown in FIG. 15, the maintenance device 9 accommodates a cap unit 93, a wipe unit 94, and a discharge unit 95 as a maintenance unit 90. The cap unit 93, the wipe unit 94, and the discharge unit 95 are arranged vertically. In the example of FIG. 15, the cap unit 93, the wipe unit 94, and the discharge unit 95 are stacked in this order from the top.

  The maintenance device 9 includes a support device 97. The support device 97 is provided for each maintenance unit 90. A first unit moving section 91 is provided in the support device 97. The maintenance device 9 includes three support devices 97. Each maintenance unit 90 is located on the upper surface of the corresponding support device 97. In the example of FIG. 15, the uppermost support device 97 supports the cap unit 93. The middle support device 97 supports the wipe unit 94. The lowermost support device 97 supports the discharge unit 95. Each support device 97 supports each maintenance unit 90 such that the top and bottom surfaces of each maintenance unit 90 are horizontal.

  For example, each support device 97 includes a first unit movement motor 901. In addition, each support device 97 includes a first moving member and a unit moving body. The first unit movement motor 901 is, for example, a stepping motor. The first unit movement motor 901 can rotate in both forward and reverse directions. The control unit 10 controls the rotation of the first unit movement motor 901. The first unit moving motor 901 rotates the first moving member. The first moving member is, for example, a ball screw. The unit moving body is a nut attached to a ball screw. The unit moving body is connected to the maintenance unit 90.

  When moving the cap unit 93 from the accommodation position to the maintenance execution position, the control unit 10 rotates the first unit movement motor 901 forward. The control unit 10 causes the first unit movement motor 901 of the support device 97 corresponding to the cap unit 93 to rotate forward. As a result, the ball screw rotates, and the cap unit 93 moves below the line head 8 in accordance with the movement of the nut. The cap unit 93 slides in the X-axis direction. The storage position is a position where the maintenance unit 90 is stored in the maintenance device 9.

  When returning the cap unit 93 from the maintenance execution position to the storage position, the control unit 10 rotates the first unit movement motor 901 in the reverse direction. The control unit 10 rotates the first unit moving motor 901 of the support device 97 corresponding to the cap unit 93 in the reverse direction. As a result, the ball screw rotates, and the cap unit 93 returns into the maintenance device 9 in accordance with the movement of the nut.

  When moving the wipe unit 94 from the storage position to the maintenance execution position, the control unit 10 rotates the first unit movement motor 901 forward. The control unit 10 causes the first unit movement motor 901 of the support device 97 corresponding to the wipe unit 94 to rotate forward. As a result, the ball screw rotates, and the wipe unit 94 moves below the line head 8 in accordance with the movement of the nut. The wipe unit 94 also slides in the X-axis direction.

  When returning the wipe unit 94 from the maintenance execution position to the storage position, the control unit 10 rotates the first unit movement motor 901 in the reverse direction. The control unit 10 rotates the first unit movement motor 901 of the support device 97 corresponding to the wipe unit 94 in the reverse direction. As a result, the ball screw rotates, and the wipe unit 94 returns into the maintenance device 9 in accordance with the movement of the nut.

  When moving the discharge unit 95 from the storage position to the maintenance execution position, the control unit 10 rotates the first unit movement motor 901 forward. The control unit 10 causes the first unit movement motor 901 of the support device 97 corresponding to the discharge unit 95 to rotate forward. As a result, the ball screw rotates, and the discharge unit 95 moves below the line head 8 in accordance with the movement of the nut. The discharge unit 95 also slides in the X-axis direction.

  When returning the discharge unit 95 from the maintenance execution position to the storage position, the control unit 10 rotates the first unit movement motor 901 in the reverse direction. The control unit 10 reversely rotates the first unit movement motor 901 of the support device 97 corresponding to the discharge unit 95. As a result, the ball screw rotates, and the discharge unit 95 returns into the maintenance device 9 in accordance with the movement of the nut.

  At the time of maintenance, the control unit 10 moves the line head 8 in the Z-axis direction. The control unit 10 moves the line head 8 to the Z-axis moving mechanism 12z in a direction away from the recording medium 7 (the transport device 3). The control unit 10 inserts a use unit (one of the maintenance units 90 to be used) after being vacated by the movement.

  The first unit moving section 91 only needs to be able to move the maintenance unit 90 between the accommodation position and the maintenance execution position. The configuration of the first unit moving section 91 is not limited to the above example.

  The maintenance device 9 includes a second unit moving section 92 for inserting the used unit into the empty space. As shown in FIG. 15, the second unit moving unit 92 includes a second unit moving motor 902, a first elevating roller 903, a second elevating roller 904, and an elevating belt 905. An elevating belt 905 is wound around the first elevating roller 903 and the second elevating roller 904. The support device 97 and the elevating belt 905 are connected. The end of the support device 97 in the X-axis direction that is farther from the line head 8 is connected to the elevating belt 905.

  The control unit 10 raises and lowers each support device 97 in accordance with the unit to be used. In the case of FIG. 15, when raising each support device 97, the control unit 10 rotates the second unit moving motor 902 such that the lifting belt 905 rotates clockwise. Thereby, each support device 97 is raised. When lowering each support device 97, the control unit 10 rotates the second unit movement motor 902 such that the lifting belt 905 rotates counterclockwise. Thereby, each support device 97 descends.

  When the interval between the ejection surface (the lower surface of the line head 8) and the upper surface of the unit to be used has reached a predetermined maintenance interval, the control unit 10 stops the second unit moving motor 902. The maintenance interval can be, for example, several mm to several cm.

  FIG. 15 shows an example in which the discharge unit 95 is raised to use the discharge unit 95. In the upper part of FIG. 15, the position of the discharge unit 95 is too low. Therefore, as shown in the lower diagram of FIG. 15, the control unit 10 raises the discharge unit 95 in the Z-axis direction. After the discharge unit 95 is raised, the control unit 10 slides the discharge unit 95 below the line head 8.

(Attaching the cap unit 93)
Next, an example of mounting the cap unit 93 to the line head 8 according to the embodiment will be described with reference to FIG. FIG. 16 is a diagram illustrating an example of a flow of attaching the cap unit 93 to the line head 8 according to the embodiment.

  The volatile components in the ink evaporate from the exposed nozzle 81. As the evaporation proceeds, the viscosity of the ink increases. As drying proceeds, the ink components solidify. Drying of the ink may cause clogging of the nozzle 81. For example, if the nozzle 81 is left as it is exposed, clogging occurs. Clogging is a state in which ink is not ejected even when a voltage is applied to the drive element 83. To maintain image quality, it is necessary to prevent clogging. The maintenance device 9 includes a cap unit 93. Each cap 9a is put on the ejection surface of the nozzle 81 of the head 8a. By covering the cap 9a, drying of the ink does not proceed.

  FIG. 16 shows an example of the flow of mounting the cap 9a corresponding to each head 8a. The start in FIG. 10 is when the cap condition is satisfied. The control unit 10 determines whether the cap condition has been satisfied. The cap condition is determined in advance. For example, when the operation panel 15 receives an instruction to attach the cap 9a, the control unit 10 determines that the cap condition is satisfied. That is, the cap condition may be that the user has input to the operation panel 15 an instruction to retract the head 8a. For example, when it is expected that printing will be stopped for a long time due to a failure in the transport line, the user inputs a mounting instruction to the operation panel 15.

  Further, the control unit 10 may determine that the cap condition has been satisfied when a predetermined mounting time has come. The mounting time can be a time when printing on the recording medium 7 is stopped. For example, the mounting time may be the start time of the lunch break. The mounting time may be the closing time. The operation panel 15 receives the setting of the mounting time. The storage unit 11 stores the set mounting time. The controller 10 may determine that the cap condition has been satisfied when printing of the recording medium 7 of one roll (processing unit on the transport line of the recording medium 7) is completed.

  First, control unit 10 moves line head 8 in the Z-axis direction (step # 11). The control section 10 moves the line head 8 to the moving section 12 (Z-axis moving mechanism 12z) in a direction away from the recording medium 7 (conveying belt 31). The control unit 10 moves the line head 8 to a height at which the cap unit 93 can be inserted below the line head 8. Specifically, the control unit 10 moves the line head 8 such that the position of the ejection surface (the lower surface of the line head 8) in the Z-axis direction becomes a predetermined position before contact. As a result, the distance between the line head 8 and the transport belt 31 (recording medium 7) increases.

  Next, control unit 10 adjusts the height of cap unit 93 in the Z-axis direction (step # 12). The control unit 10 rotates and adjusts the second unit movement motor 902. The control unit 10 sets the position of the cap unit 93 in the Z-axis direction as a position where the cap unit 93 can be inserted between the line head 8 and the transport belt 31. The control unit 10 adjusts the distance between the ejection surface at the pre-contact position and the upper end of the cap 9a to a position where the distance is a predetermined distance.

  Then, control unit 10 moves cap unit 93 to first unit moving unit 91 from the storage position to the maintenance execution position (step # 13). The control unit 10 moves the cap unit 93 in the X-axis direction to a position where the head 8a corresponding to each cap 9a can be fitted.

  After the movement of the cap unit 93 is completed, the control unit 10 fits each head 8a into each cap 9a (step # 14). The control unit 10 moves the line head 8 to the moving unit 12 (Z-axis moving mechanism 12z) in the Z-axis direction (downward). The control unit 10 moves the line head 8 in a direction approaching the cap unit 93. The control unit 10 brings the line head 8 closer to the cap unit 93 by a distance obtained by adding the predetermined interval and the depth of the cap 9a. Thus, the head 8a is fitted into the cap 9a (step # 13). The head 8a is maintained without drying the ink. Then, this flow ends (end).

  When printing is started, the control unit 10 stores the cap unit 93 in the maintenance device 9. In this case, first, the control unit 10 moves the line head 8 in a direction away from the cap unit 93 in the Z-axis direction. Remove each head 8a from each cap 9a. Then, the control unit 10 causes the first unit moving unit 91 to house the cap unit 93.

(wipe)
Next, an example of a wipe flow using the wipe unit 94 according to the embodiment will be described with reference to FIG. FIG. 17 is a diagram illustrating an example of a wipe flow using the wipe unit 94 according to the embodiment.

  During use (printing), the viscosity of the ink of some of the nozzles 81 may increase. The viscosity of the ink tends to increase as the number of ejections of the nozzle 81 decreases. Further, dust and dust in the air may adhere to the nozzle 81. These factors can cause clogging. In order to eliminate and prevent clogging, the printing system 100 has a wiping function of the head 8a (nozzle 81).

  FIG. 17 shows an example of a wipe flow of the head 8a. The start in FIG. 11 is when a predetermined wipe condition is satisfied. The control unit 10 determines whether the wipe condition has been satisfied. The wipe condition is determined in advance. For example, when the operation panel 15 receives a wipe instruction of the nozzle 81, the control unit 10 determines that the wipe condition is satisfied. In other words, the fact that the user has performed an input on the operation panel 15 to instruct the wipe of the head 8a may be used as the wipe condition.

  Further, the control unit 10 may determine that the wipe condition is satisfied when a predetermined wipe time comes. For example, the wipe time may be a lunch break start time. Further, the wipe time may be the closing time. The operation panel 15 receives the setting of the wipe time. The storage unit 11 stores the set wipe time. Further, when printing of the recording medium 7 for one roll is completed, the control unit 10 may determine that the wipe condition is satisfied.

  After the head 8a is separated from the cap 9a or when a predetermined time has elapsed from the immediately preceding wipe, the control unit 10 may determine that the wipe condition has been satisfied. Thus, the head 8a can be wiped before the viscosity of the ink increases. Further, the head 8a may be wiped before the cap 9a of the head 8a is attached. In this case, when the cap condition is satisfied, the control unit 10 determines that the wipe condition is also satisfied. Then, before putting the cap 9a on the head 8a, the control unit 10 wipes the head 8a.

  When the wipe condition is satisfied (start), control unit 10 moves line head 8 in the Z-axis direction (step # 21). The control section 10 moves the line head 8 to the moving section 12 (Z-axis moving mechanism 12z) in a direction away from the recording medium 7 (conveying belt 31). The control unit 10 moves the line head 8 to a height at which the wipe unit 94 can be inserted below the line head 8. Specifically, the control unit 10 moves the line head 8 such that the position of the ejection surface (the lower surface of the line head 8) in the Z-axis direction becomes a predetermined position before contact. As a result, the distance between the line head 8 and the transport belt 31 (recording medium 7) increases.

  Next, control unit 10 adjusts the height of wipe unit 94 in the Z-axis direction (step # 22). The control unit 10 rotates and adjusts the second unit movement motor 902. The control unit 10 sets the position of the wipe unit 94 in the Z-axis direction as a position where the wipe unit 94 can be inserted between the line head 8 and the transport belt 31. Specifically, the control unit 10 adjusts the distance between the ejection surface at the pre-contact position and the upper end of the wiping member (blade 9b) to a position at which a predetermined interval is obtained.

  Then, control unit 10 moves wipe unit 94 to first unit moving unit 91 from the storage position to the maintenance execution position (step # 23). The control unit 10 uses the wiping member to move the wipe unit 94 in the X-axis direction to a position where the corresponding head 8a can be wiped.

  Then, control unit 10 causes a purge process to be performed (step # 24). The purging process is a process of causing ink to be ejected from the nozzle 81 (exuding). Here, the ink ejection device 1 is provided with a pressure application unit 85 that applies pressure to the ink flow path (see FIG. 9). The pressure applying unit 85 is, for example, a pump. The pump is provided in an ink supply path from the ink tank 13 to each head 8a. The control unit 10 operates the pressure applying unit 85 during the purge process. The pressure application unit 85 applies pressure to the ink flow path in the head 8a. The cause of the clogging (dust or high viscosity ink) can be discharged from the nozzle 81 by the pressure. Further, the friction between the wipe member (blade 9b) and the lower surface (nozzle 81) of the head 8a can be reduced by the ink attached to the blade 9b.

  Next, control unit 10 brings the member for wiping (blade 9b) into contact with the lower surface of head 8a (step # 25). The control unit 10 moves the line head 8 to the moving unit 12 (Z-axis moving mechanism 12z) in the Z-axis direction. The controller 10 moves the line head 8 in a direction approaching the wipe unit 94. The controller 10 moves the line head 8 closer to the cap unit 93 until the wiper member is bent by being pushed by the head 8a beyond the predetermined interval.

  Subsequently, control unit 10 causes a wipe process to be performed (step # 26). At the time of the wiping process, the control unit 10 operates the wipe motor 96. The control unit 10 reciprocates the wipe member (blade 9b) once or a plurality of times. The control unit 10 rubs the nozzle row 80 from one end to the other end with a wipe member one or more times.

  The operation panel 15 may receive a selection (designation) of the head 8a to be wiped among the heads 8a. In this case, the control unit 10 operates only the blade moving unit (wipe motor 96) that moves the blade 9b corresponding to the designated head 8a. The control unit 10 moves only the blade 9b corresponding to the specified head 8a in the X-axis direction. Thereby, only the specific head 8a can be cleaned.

  Further, the wipe motor 96 may not be provided. In this case, the control unit 10 causes the first unit moving unit 91 to reciprocate the wipe unit 94 after the blade 9b comes into contact with the head 8a. The control unit 10 rubs the nozzle row 80 from one end to the other end with a wipe member one or more times. The control unit 10 swings the wipe unit 94. As a result, stains on the nozzle 81 and excess ink are removed. Then, this flow ends (end).

  When printing is started, the control unit 10 stores the wipe unit 94 in the maintenance device 9. In this case, first, the control unit 10 moves the line head 8 in a direction away from the wipe unit 94 in the Z-axis direction. The control unit 10 brings the respective wipe members and the respective heads 8a into non-contact. Then, the control unit 10 causes the first unit moving unit 91 to house the cap unit 93.

(Discharge of ink)
Next, an example of a flow of ink ejection using the ejection unit 95 according to the embodiment will be described with reference to FIG. FIG. 18 is a diagram illustrating an example of the flow of ink ejection using the ejection unit 95 according to the embodiment.

  In order to prevent clogging, it is preferable to keep the viscosity of the ink of the nozzle 81 small. Further, it is preferable that the attached dust and dust are quickly blown off. Therefore, the ink discharge device 1 has a flushing function of the head 8a (nozzle 81).

  FIG. 18 shows an example of a flushing flow of the head 8a. The start in FIG. 18 is a time when a predetermined discharging condition is satisfied. The control unit 10 determines whether or not the discharging condition is satisfied. Discharge conditions are determined in advance. For example, when the recording medium 7 is conveyed in the Y-axis direction (conveying direction) by the specified distance F1 and the conveyance of the recording medium 7 is temporarily stopped, the control unit 10 may determine that the ejection condition has been satisfied. When the printing of the unit print range E1 is completed, the control unit 10 may determine that the discharge condition has been satisfied. Further, at the start of printing of the first unit print range E1 of the roll, or when a predetermined time has elapsed from the previous flushing, the control unit 10 may determine that the discharge condition has been satisfied.

  When the discharge condition is satisfied (start), the control unit 10 moves the line head 8 in the Z-axis direction (step # 31). The control section 10 moves the line head 8 to the moving section 12 (Z-axis moving mechanism 12z) in a direction away from the recording medium 7 (conveying belt 31). The control unit 10 moves the line head 8 to a height at which the discharge unit 95 can be inserted below the line head 8. Specifically, the control unit 10 moves the line head 8 such that the position of the ejection surface (the lower surface of the line head 8) in the Z-axis direction becomes a predetermined position before contact. As a result, the distance between the line head 8 and the transport belt 31 (recording medium 7) increases.

  Next, control unit 10 adjusts the height of discharge unit 95 in the Z-axis direction (step # 32). The control unit 10 rotates and adjusts the second unit movement motor 902. The control unit 10 sets the position of the discharge unit 95 in the Z-axis direction as a position where the discharge unit 95 can be inserted between the line head 8 and the transport belt 31. Specifically, the control unit 10 adjusts the distance between the ejection surface at the pre-contact position and the upper end of the ink absorber 9c of the ejection unit 95 to a position where the interval is a predetermined interval.

  Then, control unit 10 moves discharging unit 95 to first unit moving unit 91 from the storage position to the maintenance execution position (step # 33). The control unit 10 moves the wipe unit 94 to a position where the corresponding ink absorber 9c comes below each head 8a.

  Next, control unit 10 causes ink absorber 9c to contact the lower surface of head 8a (step # 34). The control unit 10 moves the line head 8 to the moving unit 12 (Z-axis moving mechanism 12z) in the Z-axis direction. The control unit 10 causes the line head 8 to move in a direction approaching the discharge unit 95. The control unit 10 lowers the line head 8 by a predetermined interval in the Z-axis direction.

  Then, control unit 10 causes a purge process to be performed (step # 35). The control unit 10 operates the pressure applying unit 85. The control unit 10 forcibly ejects (exudes) ink from the nozzle 81.

  Further, control unit 10 causes a flushing process to be performed (step # 36). The flushing process is a process of discharging ink to all the nozzles 81. The control unit 10 causes, for example, several drops of ink to be ejected to all the nozzles 81. Then, this flow ends (end).

  When the printing is restarted after the ejection of the ink, the control unit 10 stores the ejection unit 95 in the maintenance device 9. In this case, first, the control unit 10 moves the line head 8 in a direction away from the ejection unit 95 in the Z-axis direction. The control unit 10 makes the head 8a and the ink absorber 9c non-contact. Then, the control unit 10 causes the first unit moving unit 91 to house the cap unit 93.

(Image data D2 for ink printing)
The image data D2 for ink printing will be described with reference to FIG. FIG. 19 shows an example of the flow of inputting the ink printing image data D2 to the ink ejection device 1 according to the embodiment.

  The information processing device 200 includes a processing unit 201, an information storage unit 202, an input device 205, a display device 206, and an information communication unit 207. The processing unit 201 is a substrate including a processing circuit such as a CPU. The information storage unit 202 includes a ROM, a RAM, and an HDD. The information storage unit 202 includes driver software 203 for generating the image data D2 for ink printing. The information storage unit 202 stores image editing software 204. The image editing software 204 is software for creating and editing basic image data D0 used for printing.

  The input device 205 is an input device such as a keyboard and a mouse. The user uses the input device 205 to input a transmission command for the image data D2 for ink printing. The display device 206 is the display device 206. The information communication unit 207 is an interface that communicates with the printing system 100 and other devices. The information processing device 200 can be considered as a part of the printing system 100.

  The user creates and edits image data (basic image data D0) of an image to be printed on the recording medium 7 using the image editing software 204. The basic image data D0 is image data including an image to be printed by the plate device 2 and the ink ejection device 1. In other words, the basic image data D0 is image data for printing the unit print range E1. The information storage unit 202 stores the created and edited basic image data D0. Further, the processing unit 201 may cause the information communication unit 207 to receive the basic image data D0 created by another computer. That is, the basic image data D0 fetched from outside into the information processing apparatus 200 may be used for printing on the recording medium 7. In this case, the processing unit 201 causes the information storage unit 202 to store the received basic image data D0.

  For example, when printing a barcode, the basic image data D0 includes a barcode image. When printing a symbol string (symbol string), the basic image data D0 includes an image of the symbol string. When printing a pattern (a figure, a pattern, a photograph, etc.), the basic image data D0 includes the pattern.

  When the activation command of the driver software 203 is executed, the processing unit 201 activates the driver software 203. The processing unit 201 causes the display device 206 to display a print setting screen based on the driver software 203. The input device 205 receives print settings. For example, the input device 205 receives the settings of the print position, print resolution, image type, and ejection interval of the image within the unit print range E1. For example, any one of a plurality of resolutions that can be printed by the head 8a can be selected. The processing unit 201 generates print setting information D3 indicating setting contents.

  The processing unit 201 causes the information communication unit 207 to transmit the generated print setting information D3 to the ink ejection device 1 (communication unit 19). The communication unit 19 receives the print setting information D3. The control unit 10 performs printing based on the print setting information D3.

  Further, based on the basic image data D0, the processing unit 201 generates image data D2 for ink printing. The processing unit 201 can generate the image data D2 for ink printing by decomposing the basic image data D0. The information storage unit 202 stores the generated image data D2 for ink printing. The ink printing image data D2 is image data indicating a portion to be printed by the ink ejection device 1. The ink printing image data D2 indicates a range in which the ink ejection device 1 performs printing. The information processing device 200 causes the information communication unit 207 to transmit the ink print image data D2 to the communication unit 19 of the ink ejection device 1. As a result, the ink printing image data D2 is input to the ink ejection device 1. The storage unit 11 stores the received ink printing image data D2. The ink discharge device 1 prints the unit print range E1 based on the image data D2 for ink printing. The ink discharge device 1 repeats printing of the unit print range E1 every time the recording medium 7 is transported by the specified distance F1. For example, the printing system 100 can print an image such as a code, a symbol string, or a pattern in the unit print range E1 of the recording medium 7.

  Specifically, the control unit 10 (image processing circuit 10b) performs image processing on the received ink printing image data D2 based on the print setting information D3. Further, the control unit 10 performs image processing such as halftone processing to generate image data for ink ejection. The ink ejection image data is data indicating the nozzles 81 from which ink is to be ejected. Based on the image data for ink ejection, the control unit 10 causes the head 8a to eject ink for each line.

(Division of image data)
Next, an example of a process of dividing image data in the information processing apparatus 200 according to the embodiment will be described with reference to FIGS. FIG. 20 is a diagram illustrating an example of the division processing of the information processing device 200 according to the embodiment. FIG. 21 is a diagram illustrating an example of data stored in the information storage unit 202 according to the embodiment.

  The information storage unit 202 stores basic image data D0 used for printing on the recording medium 7. The processing unit 201 can divide (separate) the basic image data D0. By the division, the processing unit 201 generates plate printing image data D1 and ink printing image data D2. The information storage unit 202 stores the generated plate printing image data D1 and ink printing image data D2 (see FIG. 13).

  The plate printing image data D1 is image data in a range that is printed by the plate device 2 that prints using a plate. In other words, the plate printing image data D1 is image data indicating a portion to be printed by the plate device 2. The plate printing image data D1 can be used for plate making. On the other hand, the image data D2 for ink printing is image data of a range to be printed by the ink discharging apparatus 1 that prints by discharging ink. In other words, the ink printing image data D2 is image data indicating a portion to be printed by the ink discharge device 1. By using the information processing device 200, it is possible to automatically divide the basic image data D0 into image data of a portion to be printed with a plate and image data of a portion to be printed with ink.

  The plate device 2 has an advantage that a high-density solid image can be printed quickly. On the other hand, the ink discharge device 1 has an advantage that a gradation image or an image containing a plurality of colors can be printed neatly. The processing unit 201 divides the basic image data D0 in consideration of the advantages of the plate device 2 and the ink ejection device 1.

  The input device 205 receives selection of the basic image data D0 to be divided. Further, the input device 205 receives an instruction to divide the basic image data D0. When a division instruction is given, the processing unit 201 divides the selected basic image data D0. The start in FIG. 20 is when the division instruction is given.

  Processing unit 201 checks the pixel value (color) of each pixel of basic image data D0 (step # 41). For example, the processing unit 201 generates a histogram of pixel values. Based on the confirmation result, the processing unit 201 determines a pixel value (color) to be printed by the plate device 2 (step # 42).

  One plate device 2 can print one color. If all colors included in the basic image data D0 are printed using only a plate, the number of plates may be too large. Therefore, the information storage unit 202 stores the reference plate number 208 in a nonvolatile manner (see FIG. 21). The reference plate number 208 is appropriately set. The reference plate number 208 can be, for example, any value within the range of one to ten and several sheets. The input device 205 may receive the setting of the reference plate number 208. In this case, the processing unit 201 causes the information storage unit 202 to store the set reference plate number 208.

  For example, among the pixel values included in the basic image data D0, the processing unit 201 selects pixel values in order from the pixel value with the highest use frequency. Based on the histogram, the processing unit 201 selects the same number of pixel values as the reference plate number 208. As a result, it is possible to select a plurality of types of pixel values of a pixel having a large number of pixels, such as a background color, to be printed solid.

  Processing unit 201 copies basic image data D0 (print image file) by the same number as reference plate number 208 (step # 43). Then, processing unit 201 generates plate printing image data D1 (plate printing image file) for each selected pixel value (step # 44). Specifically, the processing unit 201 selects one pixel value (one color) from the selected pixel values. Next, the processing unit 201 converts pixels having pixel values other than the selected one color out of the basic image data D0 to blank (white or transparent). This process is repeated by the number of selected pixel values.

  For example, when the reference plate number 208 is 5, the processing unit 201 generates five plate printing image data D1. The processing unit 201 generates plate printing image data D1 for each of the five types of pixel values (colors). The processing unit 201 blanks pixels other than the corresponding pixel value (color) in the copied basic image data D0. The processing unit 201 generates image data in which only the pixels to be printed by the plate device 2 are left as plate printing image data D1.

  Further, processing section 201 copies basic image data D0 again (step # 45). The number of image data (image files) generated by copying may be one. Then, processing section 201 generates ink printing image data D2 based on the copied basic image data D0 (step # 46).

  Specifically, the processing unit 201 converts a pixel of a pixel value (selected pixel value) to be printed by the plate device 2 in the copied basic image data D0 into a blank (white or transparent). For example, when the reference plate number 208 is 5, the processing unit 201 blanks pixels of the selected five colors (five types of pixel values). The processing unit 201 generates image data in which pixels other than the pixels to be printed by the plate device 2 are left as image data D2 for ink printing. Then, this flow ends (end).

  Note that the processing unit 201 may cause the display device 206 to display a division instruction screen (not shown) for receiving an instruction to divide the basic image data D0. Then, the processing unit 201 may display a button for selecting a priority condition on the division instruction screen. For example, a print cost priority button, a print quality priority button, and a normal button may be displayed.

  The color paste of the plate device 2 is often less expensive than the ink of the ink ejection device 1. Therefore, when the input device 205 receives the operation of the print cost priority button, the processing unit 201 may perform a correction to increase the reference plate number 208. In this case, the number of the plate printing image data D1 to be generated increases. The range printed by the plate printing apparatus is widened.

  The ink ejection device 1 can print a fine image. Therefore, when the input device 205 receives the operation of the print quality priority button, the processing unit 201 may perform a correction to reduce the reference plate number 208. In this case, the number of plate printing image data D1 to be generated decreases. The range printed by the ink ejection device 1 is widened. When the input device 205 receives the operation of the normal button, the processing unit 201 does not correct the reference plate number 208 in the information storage unit 202.

(Display based on division)
Next, an example of display on the information processing apparatus 200 according to the embodiment will be described with reference to FIGS. FIG. 22 is a diagram illustrating an example of a flow of a display process of the information processing device 200 according to the embodiment. FIG. 23 is a diagram illustrating an example of the division setting screen 209 according to the embodiment.

  When the plate printing image data D1 and the ink printing image data D2 are newly generated, the information processing apparatus 200 performs a process for displaying the division setting screen 209. FIG. 22 shows an example of a process for displaying the division setting screen 209. The processing unit 201 performs the processing in FIG. 22 to display the division setting screen 209 on the display device 206. FIG. 23 shows an example of the division setting screen 209.

  The start in FIG. 22 is when the basic image data D0 is divided. In other words, this is the time when the processing unit 201 newly generates the plate printing image data D1 and the ink printing image data D2.

  First, processing unit 201 causes display device 206 to display a screen (not shown) for setting print amount 210 (step # 51). The user uses the input device 205 to input the print amount 210. Input device 205 receives input of print amount 210 (step # 52). The print amount 210 is the amount of the recording medium 7 to be printed using the plate printing image data D1 and the ink printing image data D2. When the recording medium 7 is a cloth, for example, the number of rolls is input as the print amount 210. The size and number of recording media 7 may be inputtable. The processing unit 201 recognizes the input print amount 210.

  Next, the processing unit 201 calculates the estimated printing cost 211 (step # 53). Specifically, the processing unit 201 obtains the estimated plate production cost 212 and the estimated color paste allowance 213 as the estimated plate printing cost 211.

  First, when obtaining the estimated plate production cost 212, the processing unit 201 obtains a required number of plates based on the number (number of data) of the generated plate printing image data D1. The processing unit 201 recognizes the number of the generated plate printing image data D1 as the required number of plates. The information storage unit 202 stores the production unit price per plate (plate production unit price 214) in a nonvolatile manner (see FIG. 21). The plate production unit price 214 includes the material cost and the processing cost of one plate. The operation panel 15 may receive the setting of the plate production unit price 214. In this case, the processing unit 201 causes the information storage unit 202 to store the set plate production unit price 214. Then, the processing unit 201 obtains the estimated plate production cost 212 by multiplying the plate production unit price 214 by the required number of plates. Note that the estimated version production cost 212 may be obtained by another method.

  When obtaining the predicted color glue allowance 213, for example, the processing unit 201 obtains the number of pixels of a portion to be printed with color glue (a range printed by the plate device 2) in the plate printing image data D1. The information storage unit 202 stores the color glue unit price 215 per pixel in a nonvolatile manner (see FIG. 21). When using a plurality of color pastes, the processing unit 201 may set the average value of the unit prices of the plurality of pastes as the color paste unit price 215. Further, the information storage unit 202 may store the color glue unit price 215 for each color in a nonvolatile manner. The operation panel 15 may accept the setting of the color glue unit price 215. In this case, the processing unit 201 stores the set color paste unit price 215 in the information storage unit 202 in a nonvolatile manner.

  Further, the processing unit 201 obtains the number of the unit print ranges E1 included in the set print amount 210. For example, the operation panel 15 receives the setting of the length of one roll in the Y-axis direction (transport direction). The operation panel 15 receives the setting of the length of the unit print range E1 in the Y-axis direction. The processing unit 201 may recognize the length of the unit print range E1 in the Y-axis direction based on the plate printing image data D1 or the basic image data D0. The processing unit 201 divides the length of one roll in the Y-axis direction by the length of the unit print range E1 in the Y-axis direction. The processing unit 201 obtains the number of sides of the unit print range E1 included in one roll of cloth. The processing unit 201 multiplies the determined number of sides, the print amount 210 (the number of rolls), the number of pixels of the portion to be printed with color glue, and the color glue unit price 215 to obtain an estimate of the estimated color glue allowance 213. Note that the predicted color paste margin 213 may be obtained by another method.

  Next, the processing unit 201 calculates the estimated ink cost 216 (step # 54). Specifically, the processing unit 201 obtains the estimated ink consumption 217 used in the set print amount 210. Then, based on the estimated ink consumption 217, the processing unit 201 obtains the ink cost for printing the set print amount 210 as the estimated ink cost 216.

  The processing unit 201 calculates a predicted ink consumption 217 based on the image data D2 for ink printing. For example, the processing unit 201 obtains the number of pixels of a portion to be printed with ink in the image data D2 for ink printing. The information storage unit 202 stores the ink unit price 218 per pixel in a nonvolatile manner (see FIG. 21). The ink unit price 218 is a standard value. When the price of the ink of each color varies, the processing unit 201 may set the average value of the ink unit price 218 per pixel of each color as the ink unit price 218. The operation panel 15 may receive the setting of the ink unit price 218. In this case, the processing unit 201 stores the set ink unit price 218 in the information storage unit 202 in a nonvolatile manner.

  Further, the processing unit 201 determines the number of sides of the unit print range E1 included in one roll obtained in step # 53, the print amount 210 (the number of rolls), the number of pixels of a portion to be printed with ink, and the ink unit price 218. Multiply to find a guide for ink cost. Note that the ink cost may be obtained by another method.

  Next, processing unit 201 obtains predicted plate production time 219 (step # 55). In step # 53, the processing unit 201 obtains the required number of plates. The information storage unit 202 stores the production time per unit plate (unit production time 220) in a nonvolatile manner (see FIG. 21). The unit production time 220 differs depending on the material of the plate and the method of producing the plate. For example, when a thin and soft material is used as the plate, the estimated plate production time 219 becomes short. In some cases, it may take several days to several weeks to produce a plate. For example, when the plate is thick, when the plate manufacturing operation is complicated, or when the plate takes days to transport, the unit manufacturing time 220 is increased. The unit production time 220 is determined in consideration of the circumstances. The operation panel 15 may receive the setting of the unit production time 220. In this case, the processing unit 201 causes the information storage unit 202 to store the set unit production time 220. Then, the processing unit 201 obtains an estimate of the estimated plate production time 219 by multiplying the unit production time 220 by the required number of plates. Note that the estimated plate production time 219 may be obtained by another method.

  Further, processing unit 201 obtains estimated print time 221 (step # 56). The information storage unit 202 non-volatilely stores the time required for printing the unit print range E1 (unit print time 222) (see FIG. 21). The unit printing time 222 may be a time period from when the conveyance device 3 temporarily stops the conveyance of the recording medium 7 to when the conveyance of the recording medium 7 is temporarily stopped next. The operation panel 15 may receive the setting of the unit print time 222. The user may set the time obtained by adding the estimated print time 221 by the ink ejection device 1 to the unit print time 222 in the cycle in which the conveyance device 3 temporarily stops the conveyance of the recording medium 7. In this case, the information storage unit 202 stores the set unit print time 222. The processing unit 201 multiplies the number of sides of the unit print range E1 included in one roll obtained in step # 53, the print amount 210 (the number of rolls), and the unit print time 222 to obtain an estimated print time 221. Note that the estimated printing time 221 may be obtained by another method.

  Then, processing unit 201 causes display device 206 to display division setting screen 209 (step # 57). This flow ends at step # 57 (end).

  Next, an example of the division setting screen 209 will be described with reference to FIG. The processing unit 201 causes the display device 206 to display the calculated estimated production cost 212 and the estimated color paste allowance 213. Further, the processing unit 201 causes the display device 206 to display the calculated sum of the estimated plate production cost 212 and the estimated color paste allowance 213 as the estimated plate printing cost 211. Further, the processing unit 201 causes the display device 206 to display the predicted ink consumption 217 and the ink cost (predicted ink cost 216) obtained based on the predicted ink consumption 217.

  Further, the processing unit 201 causes the display device 206 to display the obtained estimated plate production time 219. The processing unit 201 causes the display device 206 to display the calculated estimated printing time 221. Further, the processing unit 201 causes the display device 206 to display the total of the estimated plate production time 219 and the estimated printing time 221 as the estimated required time 223. The estimated required time 223 is a measure of the time from the production of the plate to the actual completion of printing with the set print volume 210. It is possible to confirm whether or not the delivery date of the printed matter is in time.

  Further, as shown in FIG. 23, the processing unit 201 may display a preview image (plate printing preview image 224) of a portion to be printed based on the plate printing image data D1 on the division setting screen 209. The processing unit 201 reduces the generated plate printing image data D1 to generate preview display image data. Based on the generated preview display data, the processing unit 201 displays, for each selected pixel value (color), a preview image of a portion printed using a plate.

  As illustrated in FIG. 23, the processing unit 201 may display a preview image (ink print preview image 225) of a portion to be printed based on the image data D2 for ink printing on the division setting screen 209. The processing unit 201 reduces the image data D2 for ink printing and generates image data for preview display. The processing unit 201 displays a preview image of a portion printed using ink based on the generated preview display data.

  Further, the division setting screen 209 includes a change button 226. The change button 226 is a button for changing the value of the print amount 210. When the change button 226 is operated using the input device 205, the processing unit 201 causes the display device 206 to display a software keyboard screen (not shown) for inputting numerical values. By operating the software keyboard screen, the value of the print amount 210 can be changed. The input device 205 receives a change in the print amount 210.

  When the input device 205 receives the change in the print amount 210, the processing unit 201 executes the flowchart in FIG. 22 again based on the print amount 210 after the change. As a result, the processing unit 201 calculates the estimated plate production cost 212, the estimated color paste allowance 213, the estimated plate printing cost 211, the estimated ink consumption 217, the ink cost (estimated ink cost 216), the estimated plate production time 219, and the estimated print time. 221, a predicted required time 223 is newly obtained. The processing unit 201 includes a newly calculated estimated plate production cost 212, estimated color paste allowance 213, estimated plate printing cost 211, estimated ink consumption 217, ink cost (estimated ink cost 216), estimated plate production time 219, and estimated printing. The time 221 and the estimated required time 223 are displayed on the display device 206. Each cost and each time corresponding to the change of the print amount 210 after the change can be immediately displayed.

  Further, on the division setting screen 209, a plate number change button 227 is provided. This button is used to set the number of plates desired by the user. When the plate number change button 227 is operated using the input device 205, the processing unit 201 causes the display device 206 to display a software keyboard screen (not shown) for inputting a numerical value. The number of plates can be changed by operating the software keyboard screen. The input device 205 receives a change in the number of plates.

  When the input device 205 receives the change in the number of plates, the processing unit 201 executes the flowchart of FIG. 20 again so that the changed number of plates is obtained. Thereby, the processing unit 201 newly generates the image data D1 for plate printing and the image data D2 for ink printing.

  When a change to increase the number of plates is made, the processing unit 201 increases the number of pixel values to be selected as compared to before the change. For example, among the pixel values included in the basic image data D0, the processing unit 201 reselects pixel values in the same order as the number of plates after the change in order from the pixel value with the highest use frequency. The processing unit 201 generates plate printing image data D1 for each selected pixel value. In this case, the number of plates to be manufactured increases. Further, the processing unit 201 generates image data from which the pixel value selected from the basic image data D0 has been deleted as the ink printing image data D2. In this case, the printing range of the ink ejection device 1 becomes smaller.

  When a change is made to reduce the number of plates, the processing unit 201 reduces the number of pixel values to select from before the change. For example, among the pixel values included in the basic image data D0, the processing unit 201 reselects pixel values in the same order as the number of plates after the change in order from the pixel value with the highest use frequency. The processing unit 201 generates plate printing image data D1 for each selected pixel value. In this case, the number of plates manufactured is reduced. Further, the processing unit 201 generates image data from which the pixel value selected from the basic image data D0 has been deleted as the ink printing image data D2. In this case, the printing range of the ink ejection device 1 is widened.

  Here, the plate device 2 tends to make the printed image darker than the ink ejection device 1. On the other hand, there is a case where a specific area in the basic image data D0 is desired to be printed by the ink ejection device 1. Therefore, the input device 205 may receive an operation of changing a part of the plate printing image data D1 to the ink printing image data D2. Further, the input device 205 may receive an operation of changing a part of the ink printing image data D2 to the plate printing image data D1. When the range designation button 228 in the division setting screen 209 is operated, these change operations can be performed. That is, the division between analog (plate) and digital (ink) may be manually corrected.

  When an operation to move a part of the plate printing image data D1 to the ink printing image data D2 is performed, the processing unit 201 newly generates the plate printing image data D1 and the ink printing image data D2 (again, Generate). Specifically, the processing unit 201 transfers the area of the plate printing image data D1 to which the movement is instructed to the ink printing image data D2. Since the plate printing image data D1 and the ink printing image data D2 are newly generated, the processing unit 201 executes the flowchart of FIG. For example, when the entire range of the plate printing image data D1 of a certain pixel value (color) is moved, the number of plates decreases. Based on the newly generated plate printing image data D1 and ink printing image data D2, the processing unit 201 recalculates each cost and each time, and causes the display device 206 to display a new division setting screen 209.

  When an operation for moving a part of the ink printing image data D2 to the plate printing image data D1 is performed, the processing unit 201 newly generates the plate printing image data D1 and the ink printing image data D2 (again, Generate). The processing unit 201 recognizes, in the image data D2 for ink printing, an area to which movement is instructed. When the area designated to be moved includes a pixel value other than the color (pixel value) of the plate printing image data D1, the processing unit 201 increases the number of the plate printing image data D1. Since the plate printing image data D1 and the ink printing image data D2 are newly generated, the processing unit 201 executes the flowchart of FIG. Based on the newly generated plate printing image data D1 and ink printing image data D2, the processing unit 201 recalculates each cost and each time, and causes the display device 206 to display a new division setting screen 209.

(Transmission of plate printing image data D1 to plate making machine 300)
Next, an example of transmission of the plate printing image data D1 of the information processing apparatus 200 according to the embodiment will be described with reference to FIG.

  As shown in FIG. 19, the information communication unit 207 may be communicably connected to the plate making machine 300. For example, the information communication unit 207 and the plate making machine 300 may be connected via a cable or a network. Here, the plate making machine 300 is a device for producing a plate used for printing in the plate device 2. For example, the plate making machine 300 is an apparatus for producing the screen plate 22. The plate making machine 300 may be an apparatus that manufactures a plate by performing engraving. Further, a 3D printer may be used as the plate making machine 300. The plate making machine 300 forms a transparent portion of the color paste inside the plate.

  The input device 205 may receive an instruction to transmit the plate printing image data D1 to the plate making machine 300. When the transmission instruction of the plate printing image data D1 is given, the processing unit 201 causes the information communication unit 207 to transmit the plate printing image data D1 to the plate making machine 300. For example, the processing unit 201 causes the information communication unit 207 to transmit the plate printing image data D1 of all the plates. The processing unit 201 causes the plate making machine 300 to perform plate making based on the plate printing image data D1. A prepress output instruction to the prepress machine 300 can be performed by the information processing device 200.

(Setting of operation mode of ink ejection device 1)
Next, an example of setting an operation mode of the ink ejection device 1 according to the embodiment will be described with reference to FIG. FIG. 24 is a diagram illustrating an example of a mode setting in the ink ejection device 1 according to the embodiment.

  The ink ejection device 1 performs printing by ejecting ink. The control unit 10 causes the line head 8 to eject ink. The ink ejection device 1 has a normal mode and a head movement mode. Regardless of which of the normal mode and the head movement mode is selected, the control unit 10 causes the line head 8 to perform printing on the recording medium 7 being conveyed.

  Here, in the printing system 100, each time the recording medium 7 is conveyed by the specified distance F1, the conveyance device 3 temporarily stops the conveyance of the recording medium 7. This is because the plate device 2 performs printing. In the normal mode, the control unit 10 does not cause the line head 8 to perform printing on the recording medium 7 whose conveyance has been stopped. The normal mode is a mode for printing by a single pass method.

  On the other hand, in the head movement mode, the control unit 10 causes the line head 8 to perform printing on the recording medium 7 whose conveyance has been stopped. The control unit 10 moves the line head 8 in the Y-axis direction to perform printing on the recording medium 7 during which conveyance is stopped. The head movement mode is a mode for performing overwriting.

  The start in FIG. 24 is a time when the operation mode setting of the ink ejection apparatus 1 is started. By performing a predetermined operation on the operation panel 15, the setting of the operation mode of the ink ejection device 1 can be started. The operation panel 15 receives an operation mode setting start instruction. Based on the output of the operation panel 15, the control unit 10 recognizes that the operation mode setting start instruction has been issued.

  Note that the information processing apparatus 200 (the input device 205) may receive the setting of the operation mode of the ink ejection apparatus 1. In this case, the information processing device 200 (the processing unit 201) performs the same processing as in FIG. The processing unit 201 notifies the information communication unit 207 of the set operation mode to the ink ejection device 1 (communication unit 19). The control unit 10 recognizes the operation mode of the ink ejection device 1 based on the notification from the information communication unit 207. The control unit 10 operates the ink ejection device 1 (the line head 8 and the moving unit 12) in the recognized operation mode.

  First, control unit 10 causes display panel 15a to display a mode selection screen (step # 61). The mode selection screen is a screen for selecting whether to print in the normal mode or in the head movement mode. The operation panel 15 (touch panel 15b) receives a selection of printing in the normal mode or in the head moving mode. Based on the output of operation panel 15, control unit 10 recognizes the selected one of the two modes (step # 62). Thus, the setting of the operation mode is completed (end). The control unit 10 performs control according to the selected mode.

(Home position of line head 8)
Next, an example of the home position of the line head 8 according to the embodiment will be described. In the ink ejection device 1, the line head 8 can be moved in the Y-axis direction. A home position of the line head 8 in the Y-axis direction is determined in advance.

  Of the movable range in the Y-axis direction, the most upstream position in the Y-axis direction (transport direction) may be set as the home position of the line head 8. In addition, the most downstream position in the Y-axis direction (transport direction) of the movable range in the Y-axis direction may be set as the home position of the line head 8. The home position may be the same in the normal mode and the head movement mode, or may be different.

(Printing in normal mode)
Next, an example of printing in the normal mode according to the embodiment will be described with reference to FIG. FIG. 25 is a diagram illustrating an example of printing in the normal mode according to the embodiment.

  In the normal mode, the position of the line head 8 in the Y-axis direction is fixed at the home position. Printing is performed without moving the line head 8 in the Y-axis direction. The recording medium 7 is divided by a plurality of unit print ranges E1. The control unit 10 performs the process of FIG. 25 for each unit print range E1.

  The start in FIG. 25 is a point in time when printing of the unit print range E1 is started. For example, based on the output of the timing sensor 16, the control unit 10 may recognize that the head of the unit print range E1 has reached below the line head 8. First, control unit 10 sets the position of line head 8 in the Y-axis direction as the home position (step # 71). When line head 8 is already at the home position, control unit 10 skips step # 71.

  Then, control unit 10 causes line head 8 to perform printing on transported recording medium 7 (passing through line head 8) (step # 72). The control unit 10 causes each head 8a to eject ink based on the ink ejection image data. The control unit 10 causes each head 8a to perform one ink ejection operation each time the recording medium 7 is conveyed by one line in the Y-axis direction (sub-scanning direction). Based on the image data for ink ejection, the control unit 10 causes ink droplets to land on pixels (portions not printed by the screen plate 22) on the recording medium 7 where ink is to be applied. This flow ends when ink ejection within the unit print range E1 is completed (end).

  Note that the control unit 10 may cause each head 8a to perform the ink ejection operation a plurality of times during the conveyance of one line. In the normal mode, the control unit 10 may cause the same color ink to land on the same position a plurality of times.

(Printing in head movement mode)
Next, an example of printing in the head movement mode according to the embodiment will be described with reference to FIG. FIG. 26 is a diagram illustrating an example of printing in the head movement mode according to the embodiment.

  In the head movement mode, the control unit 10 fixes the position of the line head 8 in the Y-axis direction at the home position while the recording medium 7 is being conveyed. While transporting the recording medium 7, the control unit 10 performs printing without moving the line head 8 in the Y-axis direction. On the other hand, the controller 10 moves the line head 8 in the Y-axis direction while the conveyance of the recording medium 7 is stopped. The control unit 10 causes the ink to be ejected while the line head 8 is moving. Then, the recording medium 7 is divided by a plurality of unit print ranges E1. The control unit 10 performs the process of FIG. 26 for each unit printing range E1.

  The start in FIG. 26 is a time when printing of the unit print range E1 is started in the head movement mode. For example, based on the output of the timing sensor 16, the control unit 10 may recognize that the head of the unit print range E1 has reached below the line head 8. Then, control unit 10 sets the position of line head 8 in the Y-axis direction as the home position (step # 81). If line head 8 is already at the home position, control unit 10 skips step # 81.

  Then, control unit 10 causes line head 8 to perform printing on transported recording medium 7 (step # 82). The line head 8 discharges ink onto the recording medium 7 being conveyed (passed). The control unit 10 causes each head 8a to eject ink based on the ink ejection image data. Based on the image data for ink ejection, the control unit 10 causes ink droplets to land on pixels (portions not printed by the screen plate 22) on the recording medium 7 where ink is to be applied. The control unit 10 causes each head 8a to perform one ink ejection operation each time the recording medium 7 is conveyed by one line in the Y-axis direction (sub-scanning direction).

  Note that the control unit 10 may cause each head 8a to perform the ink ejection operation a plurality of times during the conveyance of one line. In the normal mode, the control unit 10 may cause the same color ink to land on the same position a plurality of times.

  When the conveyance of the recording medium 7 is stopped by the conveyance of the specified distance F1, the control unit 10 moves the line head 8 to the moving unit 12 (Y-axis moving mechanism 12y) in the Y-axis direction (Step # 83). The control unit 10 may recognize that the conveyance of the recording medium 7 has been stopped based on the notification of the conveyance stop from the conveyance device 3. Further, based on the output of the speed sensor 10d, the control unit 10 may recognize that the conveyance of the recording medium 7 has stopped.

  The control unit 10 moves the line head 8 to the moving unit 12 toward the recording medium 7 that has passed the line head 8. For example, when the home position is the most upstream position in the movable range of the line head 8, the control unit 10 moves the line head 8 to the moving unit 12 toward the downstream side in the transport direction (Y-axis direction). Move. The moving speed of the line head 8 in the Y-axis direction is determined based on the cycle (frequency) of ink ejection. The control unit 10 moves the line head 8 in the Y-axis direction for one line (one dot) by one or an integer multiple of the ink ejection cycle.

  Then, control unit 10 causes line head 8 to perform overwriting printing on stopped recording medium 7 (step # 84). The control unit 10 causes the line head 8 to eject ink so that the same color ink is re-landed at the same position. In other words, the control unit 10 causes the line head 8 to pass over the image printed with the ink when passing through the line head 8. At the time of re-passing, the control unit 10 ejects the same color ink at the same position as at the time of the first passing. Thus, by moving the line head 8 in the Y-axis direction, overwriting can be performed.

  Further, when performing the ink discharge onto the recording medium 7 while the conveyance is stopped, the control unit 10 may cause the line head 8 to discharge the ink such that the same color ink is re-landed at the same position a plurality of times. . In other words, while moving the line head 8 in the Y-axis direction, the control unit 10 may cause the same pixel to land ink of the same color a plurality of times. In this case, overwriting can be performed a plurality of times. The density of an image printed with ink can be further increased.

  Upon completion of overwriting printing within the unit print range E1, the control unit 10 returns the line head 8 to the home position (step # 85). The control unit 10 moves the line head 8 to the Y-axis moving mechanism 12y in the direction of the home position. This flow ends (END).

  When returning the line head 8 to the home position, the control unit 10 may cause the line head 8 to perform overwriting. When returning to the home position, the control unit 10 also causes the line head 8 to eject ink such that the same color ink lands at the same position a plurality of times.

  When the movement to the home position is completed, the transport device 3 restarts transporting the recording medium 7. The control unit 10 may notify the transfer device 3 of the completion of the movement of the line head 8 to the home position. Based on this notification, the transport device 3 may restart the stop of transport of the recording medium 7.

(Setting of the position of the line head 8 in the Z-axis direction)
Next, an example of position setting at the time of starting printing of the line head 8 according to the embodiment will be described with reference to FIG. FIG. 27 illustrates an example of position setting at the time of starting printing of the line head 8 according to the embodiment.

  The start in FIG. 27 is a point in time when printing is started using the ink ejection device 1. For example, after the main power is turned on or after maintenance by the maintenance unit 90, the control unit 10 sets the line head 8 to a position where printing is performed.

  Based on the output of the interval sensor 17, the control unit 10 starts recognizing the interval between the nozzle 81 and the recording medium 7 (print surface 71) (step # 91). The ink ejection device 1 includes an interval sensor 1746 (see FIG. 6). The interval sensor 17 measures the distance between the nozzle 81 and the printing surface 71. Based on the output of the interval sensor 17, the control unit 10 recognizes the distance between the nozzle 81 and the printing surface 71 in the Z-axis direction.

  For example, the interval sensor 17 is provided on the line head 8 located at the most upstream in the transport direction (Y-axis direction) of the recording medium 7. The line head 8 is provided upstream of the nozzle row 80 in the Y-axis direction. The control unit 10 recognizes the distance between the nozzle 81 and the printing surface 71 in the Z-axis direction before the nozzle row 80 in which the leading end of the recording medium 7 is at the most upstream side starts ink ejection. In the case of printing in the first unit print range E1, the control unit 10 starts recognition of the interval from the time when the printing surface 71 of the recording medium 7 comes to a position facing the interval sensor 17.

  Then, control unit 10 performs a positioning process before starting printing of unit print range E1 (step # 92). At the time of the positioning process, the control unit 10 moves the line head 8 to the moving unit 12 in the Z-axis direction. Then, the control unit 10 sets the interval between the nozzle 81 and the printing surface 71 as the ejection time interval. The ejection time interval can be, for example, 1 mm. Specifically, the control unit 10 moves the line head 8 (nozzle 81) to the moving unit 12 so that the interval detected by the interval sensor 17 becomes the ejection time interval. The control unit 10 moves the head 8a closer to the recording medium 7.

(Detection of floating portion 7a of recording medium 7)
Next, detection of the floating portion 7a of the ink ejection device 1 according to the embodiment will be described with reference to FIGS. FIG. 28 and FIG. 29 are diagrams illustrating an example of the floating sensor 14 according to the embodiment. FIG. 30 is a diagram illustrating an example of recognition of the position of the floating portion 7a of the control unit 10 according to the embodiment.

  The printing system 100 (ink ejection device 1) includes a floating sensor 14. The floating sensor 14 is a sensor that detects a floating portion 7 a of the recording medium 7. In other words, the floating sensor 14 is a sensor for detecting the position of a floating portion of the recording medium 7. The floating portion 7 a is a portion where the recording medium 7 is convex (elevated) toward the line head 8.

  There is a thick recording medium 7. Such a recording medium 7 includes, for example, cloth. In the thick recording medium 7, even a small wrinkle, the height (width) in the Z-axis direction may be larger than the distance (gap) between the head 8a and the recording medium 7. The floating portion 7a may come into contact with the head 8a and the recording medium 7 may be clogged in the gap. When the recording medium 7 is clogged, a force for conveying the recording medium 7 is applied to the head 8a. As a result, the head 8a may be damaged or broken. Therefore, the control unit 10 detects the position of the floating portion 7a based on the output of the floating sensor 14.

  As shown in FIG. 28, one roller 140 is provided for each head 8a of the line head 8. For example, the position of each roller 140 in the X-axis direction is the same as the center of the corresponding head 8a in the X-axis direction. The position of each roller 140 in the Y-axis direction is the same. Note that a plurality of rollers 140 may be provided for the head 8a.

  The roller 140 is provided on the upstream side in the Y-axis direction from the line head 8 on the most upstream side in the Y-axis direction (transport direction). The rollers 140 come into contact with the recording medium 7 to be conveyed. The roller 140 rotates. The roller 140 is driven by the recording medium 7. The direction of the rotation axis of the roller 140 is the X-axis direction. The roller 140 swings in the vertical direction (Z-axis direction) in accordance with the floating of the contact surface (surface, upper surface) of the recording medium 7. In the example of FIG. 28, the second roller 140 from the left is lifted in accordance with the floating portion 7a.

  The floating sensor 14 detects whether the roller 140 is floating. The floating sensor 14 is, for example, a transmission optical sensor. One floating sensor 14 is provided for one roller 140. The floating sensor 14 is provided at a position farther from the recording medium 7 than the roller 140 in the Z-axis direction. The floating sensor 14 includes a light emitting unit 14a and a light receiving unit 14b. The light emitting section 14a emits light toward the light receiving section 14b. The light emitting unit 14a is, for example, an LED. The light receiving unit 14b is, for example, a phototransistor. As shown in FIG. 29, when there is no floating portion 7a, the roller 140 does not block the optical path of the light emitting unit 14a and the light receiving unit 14b. When lifted by the floating portion 7a, the roller 140 blocks the optical path of the light emitting unit 14a and the light receiving unit 14b. The output of the floating sensor 14 (light receiving unit 14b) differs depending on whether or not the recording medium 7 is floating.

  The output of each floating sensor 14 is input to the control unit 10. Based on the output of each floating sensor 14, the control unit 10 recognizes the presence or absence of the floating portion 7a and the position of the floating portion 7a. The control unit 10 determines a head 8a (adjustment target head) that may collide with the recording medium 7 among the heads 8a based on the recognized position of the floating portion 7a. In the case of FIG. 28, based on the output of each floating sensor 14, the control unit 10 determines that the second head 8a from the left is the head to be adjusted.

  The method of detecting the floating of the recording medium 7 is not limited to the above. The presence or absence of floating of the recording medium 7, the position of the floating portion 7a, and the head to be adjusted may be determined by a method other than the above.

(Adjustment moving unit 8b)
Next, an example of the adjustment moving unit 8b according to the embodiment will be described with reference to FIGS. 31 and 32 are diagrams illustrating an example of the adjustment moving unit 8b according to the embodiment.

  The floating portion 7a of the recording medium 7 may collide with the head 8a. It is necessary to avoid collision between the recording medium 7 and the head 8a. Therefore, the ink ejection device 1 includes the adjustment moving unit 8b. The adjustment moving unit 8b releases (moves) the head 8a in a direction away from the recording medium 7 (the transport belt 31). The adjustment moving unit 8b adjusts the position of the head 8a in the Z-axis direction.

  The adjustment moving unit 8b is provided for each head 8a. FIG. 31 shows an example of the adjustment moving unit 8b. 31 is a diagram in which the head 8a and the adjustment movement are viewed from above in the Z-axis direction. 31 is a diagram in which the head 8a and the adjustment moving unit 8b are viewed from the downstream side in the transport direction (Y-axis direction).

  Each adjustment moving section 8b includes an adjustment motor 8c, an adjustment ball screw 8d, and an adjustment nut 8e. The diagram on the right side of FIG. 31 is an enlarged view of the adjusting motor 8c, the adjusting ball screw 8d, and the adjusting nut 8e. Further, the adjustment moving unit 8b includes a holding plate.

  As shown in the diagram on the left side of FIG. 31, a holding plate is attached to each head 8a. The first holding plate 8f is attached to both ends of the head 8a in the X-axis direction of the housing. The first holding plate 8f has a plate shape. In FIG. 31, the lower side of the first holding plate 8f is L-shaped (hook-shaped). The first holding plate 8f contacts a part of the side surface and the lower surface of the head 8a.

  Further, the second holding plate 8g is attached (fixed) to one of the planes of the head 8a parallel to the X-axis direction. The second holding plate 8g is also plate-shaped. The second holding plate 8g is connected to the two first holding plates 8f so as not to come off. The first holding plate 8f and the second holding plate 8g function as a frame for raising and lowering the head 8a.

  The adjustment nut 8e is attached to the second holding plate 8g. The adjustment nut 8e is fixed so as not to come off and move from the second holding plate 8g. As shown in FIG. 31, the adjustment ball screw 8d is inserted through the adjustment nut 8e. The shaft (rotary shaft) of the adjusting motor 8c is connected to the head (upper end) of the adjusting ball screw 8d.

  The adjustment motor 8c is, for example, a stepping motor. The control unit 10 inputs a pulse to the adjustment motor 8c. By managing the number of input pulses (the number of rotations and the rotation angle of the stepping motor), the control unit 10 can move the position of the head 8a in the Z-axis direction with high accuracy. For example, the head 8a can be moved with an accuracy of 1 mm or less.

  By rotating the adjustment motor 8c, the adjustment ball screw 8d is rotated. By rotating the adjusting ball screw 8d, the adjusting nut 8e moves in the vertical direction. With the adjusting nut 8e, the head 8a and the first holding plate 8f and the second holding plate 8g attached to the head 8a move in the vertical direction (Z-axis direction). That is, the head 8a can be moved in the Z-axis direction by rotating the adjustment motor 8c.

  A stopper 8h is attached to the adjusting ball screw 8d. A stopper 8h is provided at the end of the screw portion of the adjusting ball screw 8d farther (upper side) from the recording medium 7 and at the end (lower side) closer to the recording medium 7. The stopper 8h prevents the adjusting nut 8e from hitting the adjusting motor 8c. Further, the adjustment ball screw 8d and the adjustment nut 8e do not come off due to the stopper 8h.

(Retreat of head 8a)
Next, an example of retracting the head 8a according to the embodiment will be described with reference to FIGS. FIG. 33 shows an example of a retreat flow of the head 8a according to the embodiment. FIG. 34 shows an example of retraction of the head 8a in units of columns according to the embodiment.

  The start of the flowchart in FIG. 33 is when the ink ejection apparatus 1 starts printing on the recording medium 7. First, control unit 10 sets the position of each head 8a in the Z-axis direction as a printing reference position (step # 101). For example, the control unit 10 rotates all the adjustment motors 8c. As a result, all the heads 8a are at the printing reference positions. At this time, the position of the ejection surface of each head 8a in the Z-axis direction is the same.

  For example, the reference position at the time of printing can be a position closest to the recording medium 7 (lowest position) (re-approaching position, lower limit position) in the moving range of the head 8a in the Z-axis direction by the adjustment moving unit 8b. When performing maintenance using the maintenance unit 90 (the cap unit 93, the wipe unit 94, and the discharge unit 95), the control unit 10 sets all the heads 8a to the re-approaching position and the lower limit position.

  The printing reference position may be the same position for all heads 8a. For example, the control unit 10 may set the printing reference positions of all the heads 8a as the re-approaching positions. Further, a printing reference position may be set for each head 8a. The setting of the printing reference position for each head 8a will be described later.

  Based on the output of each floating sensor 14, control unit 10 determines whether or not floating portion 7a is present on recording medium 7 (step # 102). The control unit 10 confirms whether or not there is a floating sensor 14 which is an output value at the time of light blocking.

  When there is no floating portion 7a (No in step # 102), the control unit 10 checks whether printing on all the recording media 7 is completed (step # 103). When the printing is completed (Yes in step # 103), it is not necessary to check the floating portion 7a or to retract the head 8a. Therefore, the control unit 10 ends this flow (end). When printing is not completed (No in step # 103), the flow returns to step # 102. As described above, the control unit 10 monitors the occurrence of the floating portion 7a during printing of the recording medium 7.

  When there is the floating portion 7a (Yes in step # 102), the control unit 10 determines the head 8a (adjustment target head) that may collide with the recording medium 7 (step # 104). The control unit 10 determines that the head 8a corresponding to the floating sensor 14 of the output value at the time of shading is the head to be adjusted.

  Control unit 10 retracts the head to be adjusted (step # 105). The control unit 10 moves the head 8a to the adjustment moving unit 8b corresponding to the head to be adjusted. The control unit 10 moves the head to be adjusted in a direction away from the recording medium 7 (the transport belt 31) from the printing reference position. Specifically, the control unit 10 moves the head to be adjusted to a position farthest (uppermost) from the recording medium 7 in the moving range of the head 8a in the Z-axis direction by the adjustment moving unit 8b. For example, it is moved in the Z-axis direction by at least 5 mm or more.

  When a plurality of line heads 8 are provided, the control unit 10 determines the plurality of heads 8a as heads to be adjusted. The control unit 10 determines, for each color (for each line head 8), the head 8a at the same position in the X-axis direction as the head to be adjusted. The control unit 10 retracts all the adjustment target heads. In other words, the control unit 10 collectively retracts the plurality of heads to be adjusted in units of rows.

  An example of retraction of the head 8a in units of columns will be described with reference to FIG. The recording medium 7 is conveyed. Therefore, the position of the floating portion 7a also moves downstream in the Y-axis direction (transport direction). When there are a plurality of line heads 8, it is necessary to retreat all heads 8a on the moving path of the floating portion 7a in order to completely avoid collision with the floating portion 7a.

  In the case of FIG. 34, the control unit 10 determines that the second head 8a from the left is the head to be adjusted. At this time, the control unit 10 determines that all the heads 8a on the passing line of the floating portion 7a are the heads to be adjusted. Then, the control unit 10 retracts all the heads 8a on the passing line of the floating portion 7a. As described above, the control unit 10 retracts the head 8a in units of columns.

  When a plurality of line heads 8 are provided, it is necessary to move the heads 8a in units of rows in the Y-axis direction. Therefore, one adjustment motor 8c may be provided for one row of heads 8a in the Y-axis direction (transport direction). In this case, a plurality of gears for transmitting the drive of the adjusting motor 8c are provided on each of the adjusting ball screws 8d of the heads 8a in one row. The control unit 10 can move the head 8a in units of rows in the Y-axis direction. There is no need to provide the adjustment motor 8c for each head 8a.

  After retreating the head to be adjusted, the control unit 10 continues to check whether the floating portion 7a has passed the line head 8 (Step # 106, No in Step # 106 → Step # 106). When a plurality of line heads 8 are provided, the control unit 10 checks whether or not the floating portion 7a has passed the most downstream line head 8 in the transport direction (Y-axis direction).

  The distance in the Y-axis direction from the roller 140 to the most downstream line head 8 is determined. When the recording medium 7 is conveyed by the distance from the roller 140 to the most downstream line head 8 after none of the floating sensors 14 detect the floating, the control unit 10 determines that the floating portion 7a passes through the line head 8. It is recognized that it has been done (Yes in step # 106).

  When recognizing that the floating portion 7a has passed the line head 8, the control unit 10 returns the position of the head to be adjusted to the printing reference position (step # 107). The control unit 10 operates the adjustment moving unit 8b corresponding to the adjustment target head. The control unit 10 rotates the adjustment motor 8c that moves the adjustment target head. Then, the flow returns to step # 102.

(Setting of printing reference position for each head 8a)
Next, an example of setting a printing reference position for each head 8a according to the embodiment will be described.

  The position of each head 8a in the Z-axis direction can be finely adjusted by the adjustment moving unit 8b. Therefore, the control unit 10 may change the printing reference position for each head 8a. Specifically, the control unit 10 may set a printing reference position for each head 8a based on the ink printing image data D2.

  In this case, the control unit 10 divides the ink ejection image data into a plurality. The control unit 10 divides the image data D2 for ink printing into strip-shaped image data (strip image data). The image data D2 for ink printing is divided based on the printing range of the head 8a. The range printed by one head 8a is one strip image data. The line head 8 includes seven heads 8a. Therefore, the control unit 10 divides the ink printing image data D2 into seven strip image data. In the strip image data, the Y-axis direction is the longitudinal direction.

  For example, when setting the printing reference position for each head 8a, the control unit 10 moves the head 8a to the adjustment moving unit 8b up to the position closest to the recording medium 7 (re-approach position, lower limit position) in the Z-axis direction. Let it. Further, the control unit 10 moves the line head 8 to the Z-axis moving mechanism 12z so that the ejection time interval is about 1 mm.

  The longer the interval between the printing surface 71 and the nozzle 81, the longer the time from ejection to landing. The longer the time from ejection to landing is, the greater the effect of gravity and airflow on the droplet. Therefore, the larger the distance between the printing surface 71 and the nozzle 81, the more likely the ink landing position is shifted from the target position. On the other hand, as the distance between the printing surface 71 and the nozzle 81 is smaller, a more precise image can be printed.

  On the other hand, in an image in which the necessity of precise printing is small, the ejection time interval may be set wide. For example, in a solid portion such as a background or a symbol string of one color, there is no problem even if the ink landing positions are slightly shifted. Color unevenness may be less likely to occur due to an appropriate variation in the landing position.

  Therefore, the control unit 10 may determine whether to change the printing reference position from the re-approaching position for each head 8a based on the content of the strip image data.

  For example, the control unit 10 may determine whether or not to change the printing reference position based on whether or not the strip image data is solid background image data. For example, the control unit 10 checks the pixel values of the pixels included in the strip image data. As a result of the confirmation, when the type of the pixel value is less than the predetermined reference value, the control unit 10 determines that the strip image data is solid background image data. When the type of the pixel value is equal to or larger than the reference value, the control unit 10 determines that the strip image data is not the solid background image data. When the strip image data is determined to be solid background image data, the control unit 10 determines to change the printing reference position. When determining that the strip image data is not solid background image data, the control unit 10 determines that the printing reference position is not changed.

  For the head 8a corresponding to the strip image data determined to be the solid background image data, the control unit 10 determines to change the printing reference position. For the head 8a corresponding to the strip image data determined not to be the solid background image data, the control unit 10 determines that the printing reference position is not changed.

  Further, for example, it may be determined whether or not the strip image data is image data of only a symbol string. The symbol string includes any of numbers, alphabets, marks, symbols, kana characters, and kanji. For example, the control unit 10 performs pattern matching using image data of a symbol. When the strip image data does not include a symbol, the control unit 10 determines that the strip image data is not image data of only a symbol string. When the strip image data includes a symbol string and a portion other than the symbol string is not white or transparent, the control unit 10 may determine that the strip image data is not image data of only the symbol string. When the strip image data includes a symbol string and a portion other than the symbol string is white or transparent, the control unit 10 may determine that the strip image data is image data of only the symbol string.

  For the head 8a corresponding to the strip image data determined to be only the symbol string, the control unit 10 determines to change the printing reference position. For the head 8a corresponding to the strip image data determined to be not only the symbol string, the control unit 10 determines that the printing reference position is not changed.

  The control unit 10 changes the printing reference position for the head 8a determined to change the printing reference position. For example, the control unit 10 performs correction so that the ejection time interval is widened. For example, the printing reference position of the head 8a in the Z-axis direction is changed so that the ejection interval of 1 mm is usually about 3 to 5 mm. Thus, the position of each head 8a in the Z-axis direction can be automatically adjusted based on the image data D2 for ink printing.

(Printing based on photographing of printing surface 71)
Next, an example of printing based on photographing of the printing surface 71 in the printing system 100 according to the embodiment will be described with reference to FIGS. FIG. 35 is a diagram illustrating an example of a portion related to imaging of the printing surface 71 in the printing system 100 according to the embodiment. FIG. 36 is a diagram illustrating an example of the flow of the automatic image addition mode according to the embodiment. FIG. 37 is a diagram illustrating an example of the flow of the copy mode according to the embodiment.

  The ink ejection device 1 includes a reading device 18 that reads the printing surface 71 of the recording medium 7 (see FIG. 1). The reading device 18 may be provided separately from the ink ejection device 1. The reading device 18 includes a camera. The reading device 18 photographs the recording medium 7 on the transport line. For example, the reading device 18 takes an image of a printable area of the printing system 100.

  As shown in FIG. 32, the reading device 18 includes a lens 18a, an image sensor 18b, and a camera module 18c. The camera module 18c generates shooting data D7 based on the image signal output from the image sensor 18b. The reading device 18 transmits the photographing data D7 obtained by photographing to the storage unit 11. The storage unit 11 stores the photographing data D7.

  The ink ejection device 1 has an automatic image addition mode and a copy mode as print modes based on photographing. Whether to print in the automatic image addition mode or in the copy mode can be selected on the operation panel 15. The operation panel 15 receives a selection of printing in the automatic image addition mode or printing in the copy mode.

1. Automatic image addition mode The automatic image addition mode is a mode in which an image associated with a specific image is printed on the recording medium 7 using the ink ejection device 1 based on the specific image attached to the recording medium 7. The automatic image addition mode is a mode in which an image associated with a specific mark is printed on the recording medium 7 using the ink ejection device 1 based on the specific mark provided on the recording medium 7. In the automatic image addition mode, when the specific image and the specific mark are attached to the recording medium 7, the control unit 10 causes the line head 8 to automatically print the linked image on the print surface 71. The specific image and the specific mark are not limited to those printed on the recording medium 7. The specific image and the specific mark may be, for example, a seal.

  For example, when a specific image indicating a language to be used is attached, the ink ejection apparatus 1 automatically prints a symbol string in a language corresponding to the specific image. Even when printing is performed on the recording medium 7 having a different destination using the printing system 100, a symbol string suitable for the destination can be automatically printed. It is not necessary to specify the language to be used and the ink print image data D2 to be used every time on the information processing apparatus 200 and the operation panel 15.

  For example, when a triangular mark indicating a product for Europe is attached as a specific mark, the ink ejection apparatus 1 automatically prints an image indicating a product for Europe. Using the ink ejection device 1, an appropriate image can be automatically printed. The information processing apparatus 200 and the printing system 100 do not have to specify an image indicating the destination every time.

  FIG. 37 is a diagram illustrating an example of the flow of printing in the automatic image addition mode using FIG. 36. The start in FIG. 36 is, for example, a time point when an instruction to print in the automatic image addition mode is given on the operation panel 15. First, control unit 10 causes reading device 18 to start imaging (step # 111). The reading device 18 captures an image of the recording medium 7 that is stopped or passing therethrough.

  Here, the storage unit 11 stores the determination data D8. The determination data D8 is data for determining whether or not the specific image and the specific mark are attached to the recording medium 7 (see FIG. 32). The determination data D8 is prepared for each specific image and specific mark. The control unit 10 confirms whether or not the recording medium 7 has a specific image and a specific mark based on the determination data D8.

  The determination data D8 includes the determination image data D9 as a specific image or image data indicating a specific mark. For example, when the specific image is a number indicating a model number, the determination image data D9 is basic image data D0 indicating a model number and including a number.

  The determination data D8 includes the automatic print image data D10. The automatic print image data D10 is basic image data D0 of an image to be printed corresponding to a specific image and a specific mark. The determination data D8 includes the automatic print information D11. The automatic print information D11 includes, for the automatic print image data D10, information on a print mode (normal mode, head moving mode), print resolution, and ejection interval in printing of the unit print range E1. The automatic print information D11 can be set on the information processing device 200 or the operation panel 15.

  Control unit 10 determines whether or not the captured data D7 includes a specific image and a specific mark (step # 112). For example, the control unit 10 performs pattern matching between the determination image data D9 and the photographing data D7. Then, the control unit 10 determines whether or not the specific data and the specific mark are included in the photographing data D7.

  When it is determined that the specific image and the specific mark are not included in the image data D7 (No in step # 112), the flow returns to step # 111. When it is determined that the specific data and the specific mark are included in the photographing data D7 (Yes in step # 112), the control unit 10 causes the moving unit 12 to perform the alignment of the line head 8 (step # 113).

  Control unit 10 causes line head 8 to print an image corresponding to the specific image or an image corresponding to the specific mark (step # 114). The control unit 10 performs printing based on the automatic print image data D10 corresponding to the specific image. Alternatively, the control unit 10 causes printing based on the automatic print image data D10 corresponding to the specific mark. Thereby, the image linked to the specific image or the image linked to the specific mark can be automatically printed. After printing, the flow returns to step # 111.

2. Copy Mode The copy mode is a mode in which the sample recording medium 7 is imaged and an image similar to the sample is automatically printed on the printing surface 71. By using the copy mode, the same printing as the sample can be performed on the plain recording medium 7 without editing the basic image data D0 in the information processing apparatus 200.

  FIG. 35 is a diagram illustrating an example of the flow of printing in the copy mode using FIG. 34. The start in FIG. 29 is, for example, a point in time when an instruction to print in the copy mode is given on the operation panel 15. First, control unit 10 causes reading device 18 to take an image of a sample (step # 121). The user places a sample in the imaging range of the reading device 18. The user sets the sample so that the whole is imaged. After the setting, the user operates the imaging button on the operation panel 15. In other words, the user releases the shutter for taking a sample.

  Reading device 18 generates sample photographing data D7 (step # 122). Storage unit 11 stores sample photographing data D7 (step # 123). Control unit 10 generates ink printing image data D2 used for printing based on photographing data D7 of sample recording medium 7 (step # 124). The control unit 10 generates ink print image data D2 having a size of the unit print range E1. Further, control unit 10 generates print setting information D3 for each of the generated ink printing image data D2 (step # 125). The control unit 10 may automatically determine the ejection time interval according to the type of the image data D2 for ink printing.

  Then, the sample recording medium 7 is removed from the shooting range. Control device 4 causes transport device 3 to start transporting recording medium 7 for printing an image similar to the sample (step # 126). Control unit 10 prints on recording medium 7 based on the generated ink printing image data D2 and print setting information D3 (step # 127). Thereafter, the control unit 10 causes the line head 8 and the moving unit 12 to perform the same printing as the sample on the conveyed recording medium 7 (end). Until the rear end of the recording medium 7 passes, the control unit 10 causes the line head 8 to print an image similar to the sample on the recording medium 7.

  In this manner, the ink discharge device 1 according to the embodiment is provided with the plate device 2 for printing using a plate, and can be added to and removed from the transport line of the recording medium 7 transported by the transport device 3. is there. Alternatively, the ink discharge device 1 is provided with a plate device 2 for printing using a plate, and is fixed to a transport line of the recording medium 7 transported by the transport device 3.

  The ink ejection device 1 is detachable. Therefore, the ink ejection device 1 can be added to the installed transport line. Further, the installed ink ejection device 1 can be removed from the transport line. Only the ink ejection device 1 that performs digital printing can be supplied to the market. Further, the ink ejection device 1 may be fixed to the transport line (may not be detachable). In this case, a set of devices including the ink discharge device 1 and the plate device 2 can be supplied to the market.

  The printing system 100 includes an ink ejection device 1, a transport device 3 that transports a recording medium 7, and a plate device 2 that prints the recording medium 7 transported by the transport device 3 using a plate. Since the ink ejection device 1 and the plate device 2 are included, it is possible to provide the printing system 100 having both the advantages of printing by ink jet and the advantages of printing by plate. For example, it is possible to provide a printing system 100 that prints a fine pattern or gradation including a plurality of colors with an inkjet discharge device. Usually, only one color can be printed on one plate, but the number of plates can be reduced as compared with the case where similar printing is performed using only the plate. On the other hand, when the recording medium 7 is printed only by the ink jet, there are cases where the density is hardly obtained and color unevenness occurs. A portion where color unevenness should be avoided, such as a solid portion, can be printed using a plate. A high-quality printing system 100 can be provided.

  The ink ejection device 1 includes a line head 8, a moving unit 12, a maintenance device 9, and a control unit 10. The line head 8 prints an image by discharging ink from nozzles 81 onto a printing surface 71 of the recording medium 7 conveyed by the conveyance device 3 based on the image data D2 for ink printing. The moving unit 12 moves the line head 8 in the Z-axis direction, which is the height direction when the printing surface 71 of the recording medium 7 faces the front. The maintenance device 9 is provided outside the line head 8 in the X-axis direction, which is a direction perpendicular to the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front. The maintenance device 9 includes a first unit moving unit 91 that moves the maintenance unit 90 between the accommodation position and the maintenance execution position. The maintenance execution position is a position below the ejection surface of the line head 8 where the nozzles 81 are exposed and ejects ink, and the maintenance unit 90 performs maintenance. When performing maintenance of the line head 8, the control unit 10 moves the line head 8 to the moving unit 12 in the Z-axis direction and in a direction away from the recording medium 7. The control unit 10 moves the maintenance unit 90 to the first unit moving unit 91 from the accommodation position to the maintenance execution position.

  According to this configuration, the line head 8 can be retracted (moved) in a direction away from the recording medium 7 (conveyance line). A space for maintaining the nozzle 81 (ejection surface) of the line head 8 can be created. The line head 8 can be moved away from the recording medium 7 and the maintenance unit 90 can be inserted below the line head 8. The maintenance of the line head 8 can be easily performed by the inserted maintenance unit 90. It is possible to prevent the occurrence of a problem of ink ejection of the nozzle 81.

  The line head 8 includes a plurality of heads 8a. The heads 8a are arranged so that the nozzle rows 80 are parallel to the X-axis direction. The nozzle row 80 includes a plurality of nozzles 81. The maintenance device 9 includes a cap unit 93 as the maintenance unit 90. The cap unit 93 includes a plurality of caps 9a. Each cap 9a covers the ejection surface when the ejection surface of the head 8a is fitted to prevent the ink from drying. When the predetermined cap condition is satisfied, the control unit 10 moves the cap unit 93 to the first unit moving unit 91 to the maintenance execution position. The control unit 10 fits the head 8a into the cap 9a. A cap 9a can be put on each head 8a by utilizing a space formed by keeping the line head 8 away from the recording medium 7 and the transport belt 31. The cap 9a can be automatically mounted on the head 8a. Drying of each nozzle 81 can be prevented. Since the drying of the ink can be prevented, it is possible to prevent the ink from sticking to the nozzle 81. It is possible to prevent the occurrence of a problem of non-ejection of ink. Further, the cap 9a does not have to be manually attached to the head 8a. The printing apparatus 100 that can be easily maintained can be provided. In addition, when the position of the line head 8 is fixed (when the line head 8 cannot be moved), the existing equipment and mechanism must be largely remodeled, such as the movement of the transport device 3, to automate the mounting of the cap 9a. According to the printing apparatus 100, such a modification is unnecessary.

  Further, the ink ejection device 1 includes an operation panel 15 that receives an operation. The cap condition is one or more of the following: the operation panel 15 has received the cap 9a instruction, the predetermined cap 9a time has come, and the printing has been completed. The cap 9a can be automatically attached to the line head 8 (each head 8a) based on a predetermined trigger. A trigger for automatically attaching the cap 9a to the head 8a can be set. Further, the cap 9a can be automatically attached to the head 8a at the time when the line is stopped, such as during a lunch break. In addition, the cap 9a can be automatically attached to the head 8a when printing is completed.

  When the position of the line head 8 cannot be moved, it is difficult to wipe each head 8a (nozzle 81). Therefore, the maintenance device 9 includes a wipe unit 94 as the maintenance unit 90. The wipe unit 94 includes a plurality of wipe members. When a predetermined wiping condition is satisfied, the control unit 10 moves the wipe unit 94 to the first unit moving unit 91 toward the maintenance execution position. The control unit 10 rubs the nozzle 81 of each head 8a with the wipe member. The nozzle 81 (ejection surface) can be wiped (wiped) using a space created by keeping the line head 8 away from the recording medium 7 and the transport belt 31. Further, the wiping operation can be automated. The cause of clogging of the nozzle 81 can be easily removed. The causes are ink (high-concentration ink), dust, and dust whose fluidity has decreased due to drying. There is no need to manually scrape the surface of the nozzle 81 of the head 8a. The printing apparatus 100 that can be easily maintained can be provided. When the position of the line head 8 is fixed (when the line head 8 cannot be moved), large modifications of facilities and mechanisms are required to automate the wiping operation of the head 8a. For automation, there is no need to remodel a device related to printing (for example, a device for transporting the cloth 7).

  The wiping condition is that the operation panel 15 has received the wiping instruction, that the predetermined wiping time has been reached, that the cap 9a has not been fitted for a predetermined time after the start of printing or immediately after the wiping, One or more of printing the recording medium 7 and printing completed. The wipe operation can be automatically started based on a predetermined trigger. A trigger for starting the wipe can be set. Further, the head 8a can be automatically wiped at the time when the line is stopped, such as during a lunch break. Further, when the cloth 7 is continuously printed, the head 8a can be automatically wiped. Further, the head 8a can be automatically wiped at the time of completion of printing.

  Further, the control unit 10 causes the head 8a to eject ink before rubbing with the wipe. Before the wiping (rubbing), by causing the ink to overflow (bleed) in the vicinity of the nozzle 81, the friction coefficient between the wiping member and the nozzle 81 (the ejection surface of the head 8a) can be reduced. The nozzle 81 can be prevented from being damaged during wiping.

  The wiping member is a blade 9b provided for each head 8a. The wipe unit 94 includes a blade moving unit (wipe motor 96) that moves the blade 9b in parallel with the nozzle row 80 for each blade 9b. The nozzle row 80 includes a plurality of nozzles 81. When performing a wipe, the control unit 10 moves the wipe unit 94 below the line head 8. The control unit 10 causes the blade 9b to contact the ejection surface. The control unit 10 moves the blade 9b to the blade moving unit to rub the nozzle 81. When the operation panel 15 receives designation of the head 8a to be wiped, the control unit 10 moves the blade 9b corresponding to the designated head 8a to the blade moving unit. The head 8a to be wiped can be specified. Only the specified head 8a can be wiped. It is possible to prevent the head 8a having no problem in ink ejection from being wiped.

  The maintenance device 9 includes a discharge unit 95 as the maintenance unit 90. The ejection unit 95 includes the ink absorber 9c. When a predetermined discharging condition is satisfied, the control unit 10 moves the discharging unit 95 to the first unit moving unit 91 toward the maintenance execution position. The control unit 10 causes each head 8a to eject ink. The control unit 10 causes the ink absorber 9c to absorb the ink discharged from the nozzle 81. The ink can be ejected from the nozzles 81 (ejection surfaces) using the space created by keeping the line head 8 away from the recording medium 7 and the transport belt 31. An object that clogs the nozzle 81 can be discharged (pushed out). For example, solids, dust, and dust of the dried ink can be discharged. Abnormal clogging of the nozzle 81 can be easily eliminated. In addition, the ejection of ink can be automated.

  The ejection condition is one or more of the completion of printing and the lapse of a predetermined time from the start of printing or the previous flushing process. It is possible to set a trigger of the discharging process. Further, the head 8a can be automatically wiped at the time when the transport line is stopped.

  The maintenance device 9 includes a cap unit 93, a wipe unit 94, and a discharge unit 95 as the maintenance unit 90. The cap unit 93, the wipe unit 94, and the discharge unit 95 are arranged vertically. The maintenance device 9 includes a second unit moving unit 92 that moves the cap unit 93, the wipe unit 94, and the discharge unit 95 in the vertical direction. The control unit 10 moves the used unit, which is the maintenance unit 90 to be used, to the second unit moving unit 92 in a vertical direction to a position where the unit can be moved below the ejection surface. After the movement of the used unit in the vertical direction is completed, the control unit 10 moves the used unit to the first unit moving unit 91 toward the maintenance execution position. The necessary maintenance unit 90 can be moved in accordance with the position (height) of the line head 8. The used unit that has just been raised can be pushed (moved) below the line head 8. Further, the maintenance units 90 stacked in the vertical direction can be stored in the maintenance device 9. The installation space for the maintenance device 9 can be reduced.

  The ink ejection device 1 includes a line head 8, a floating sensor 14, a control unit 10, and an adjustment moving unit 8b. The line head 8 includes a plurality of heads 8a. The line head 8 prints an image by discharging ink from a nozzle 81 onto a printing surface 71 of the recording medium 7 conveyed by the conveyance device 3 based on the image data D2 for ink printing. The floating sensor 14 detects a position of a floating portion of the conveyed recording medium 7. The control unit 10 recognizes the position of the floating portion 7a of the conveyed recording medium 7 based on the output of the floating sensor 14. The adjustment moving unit 8b adjusts the position of the head 8a in the Z-axis direction, which is the height direction when the printing surface 71 of the recording medium 7 faces the front. The heads 8a are arranged so that the nozzle rows 80 are parallel to the X-axis direction. The X-axis direction is a direction perpendicular to the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 is facing the front. The nozzle row 80 includes a plurality of nozzles 81. The control unit 10 determines the head to be adjusted, which is the head 8a that may collide with the recording medium 7, among the heads 8a, based on the recognized position of the floating portion 7a. The control unit 10 retracts the head to be adjusted to the adjustment moving unit 8b in a direction away from the recording medium 7 in the Z-axis direction.

  When the recording medium 7 hits the head 8a and is caught, a force is applied to the head 8a in the transport direction of the recording medium 7. Further, the recording medium 7 sandwiched between the head 8a and the transport belt 31 applies a force to the nozzle 81 of the head 8a from below. The head 8a may be damaged by the force applied to the head 8a. According to this configuration, the position of the head 8a likely to hit the floating portion 7a of the recording medium 7 can be shifted (released). The floating portion 7a can be prevented from hitting the head 8a (not to be caught). The head 8a can be prevented from being damaged.

  If there is a floating portion 7a, the entire line head 8 may be moved in a direction away from the recording medium 7. However, the gap between the portion of the recording medium 7 where the recording medium 7 does not float and the nozzle 81 is greatly increased. The larger the distance between the recording medium 7 and the nozzle 81, the more likely the ink landing position is shifted. If the entire line head 8 is moved to avoid the floating portion 7a, the image quality may be degraded. In the ink discharge device 1, even if the recording medium 7 is floating, the entire line head 8 is not moved. Only the specific head 8a (the head 8a in contact with the floating portion 7a) can be moved. It is possible to provide the ink ejection device 1 that can print with high image quality regardless of whether or not the recording medium 7 floats.

  Further, the ink discharge device 1 includes a plurality of line heads 8. The color of the ink ejected from the line heads 8 is different from each other. Each line head 8 is provided side by side in the Y-axis direction. Each line head 8 includes the same number of heads 8a. The Y-axis direction is the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front. The heads 8a of the respective line heads 8 are arranged so that the positions in the X-axis direction are the same. The control unit 10 determines an adjustment target head for each line head 8 based on the recognized position of the floating portion 7a. The control unit 10 collectively retreats the plurality of adjustment target heads to the adjustment moving unit 8b in a direction away from the recording medium 7 in the Z-axis direction. Of the plurality of line heads 8, the heads 8a that may collide with the floating portion 7a of the recording medium 7 can be collectively retracted. The rows of the heads 8a on the Y-axis of the floating portion 7a can be moved collectively. In any line head 8, the recording medium 7 can be prevented from hitting the head 8a.

  The adjustment moving unit 8b includes an adjustment motor 8c, an adjustment ball screw 8d connected to the adjustment motor 8c, and an adjustment nut 8e inserted through the adjustment ball screw 8d and connected to the head 8a. And The control unit 10 controls the rotation of the adjustment motor 8c to adjust the position of the head 8a in the Z-axis direction. The position of the head 8a in the Z-axis direction can be adjusted. By controlling the number of rotations and the rotation angle of the adjusting motor 8c, the position of the head 8a in the Z-axis direction (relative distance from the recording medium 7) can be finely adjusted.

  For the head 8a that has not been determined to be the adjustment target head, the control unit 10 causes the adjustment moving unit 8b to set the position of the head 8a in the Z-axis direction as the printing reference position. For the head 8a determined to be the head to be adjusted, the control unit 10 moves the head 8a to the adjustment moving unit 8b so as to be further away from the recording medium 7 than the printing reference position. The distance from the recording medium 7 can be kept constant. While the floating portion 7a passes below the head 8a, the head 8a can escape upward.

  Further, the control unit 10 determines whether or not the floating portion 7a has passed the line head 8. When determining that the floating portion 7a has passed the line head 8, the control unit 10 returns the position of the head 8a in the Z-axis direction to the printing reference position. When the floating portion 7a disappears, the position of the head 8a in the Z-axis direction can be returned to the printing reference position. The distance from the recording medium 7 can be kept constant.

  Further, the control unit 10 sets a printing reference position for each head 8a based on the ink printing image data D2. The printing reference position of each head 8a can be set in detail. The printing reference position of each head 8a can be set according to the image printed based on the ink printing image data D2.

  The ink discharge device 1 according to the present invention is provided with a plate device 2 for printing using a plate, and can be added to and removed from a transport line of a recording medium 7 transported by a transport device 3. Alternatively, the ink discharge device 1 is provided with a plate device 2 for printing using a plate, and is fixed to a transport line of the recording medium 7 transported by the transport device 3.

  The ink ejection device 1 includes a line head 8, a moving unit 12, and a control unit 10. The line head 8 prints an image by discharging ink from the nozzles 81 onto the printing surface 71 of the recording medium 7 based on the image data D2 for ink printing. The moving unit 12 moves the line head 8 in the Y-axis direction, which is the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front. The control unit 10 causes the line head 8 to eject ink while fixing the position of the line head 8 to the moving unit 12 while the recording medium 7 is being conveyed. The control unit 10 moves the line head 8 to the moving unit 12 in the Y-axis direction while the recording medium 7 is stopped, and causes the line head 8 to eject ink while moving in the Y-axis direction.

  Since the head is fixed, generally, the line type ink printer cannot perform printing while the recording medium 7 is stopped. However, according to this configuration, ink can be ejected (printed) both while the recording medium 7 is being conveyed and while the recording medium 7 is stopped. Regardless of whether or not the recording medium 7 is stopped, printing on the recording medium 7 can be performed by the line head 8. Therefore, it is possible to provide the ink ejection device 1 with high productivity (printing speed).

  In addition, while the recording medium 7 is stopped, the line head 8 is moved toward a portion where printing is performed during conveyance, so that overwriting can be performed. Overwriting allows the same color ink to land on the same position a plurality of times. It is possible to increase the density of the printed portion of the ink in the printed matter. In addition, overwriting can be performed at the same time when the conveyance of the recording medium 7 is stopped. Printing by the line head 8 can be performed during a time period when printing is not normally performed. The density of the printed matter can be increased without reducing productivity. It is possible to provide the ink ejection apparatus 1 which has high productivity and high image quality of a printed matter.

  The printing system 100 according to the embodiment includes an ink ejection device 1, a transport device 3 that transports the recording medium 7, and a plate device 2 that prints the recording medium 7 transported by the transport device 3 using a plate. , Is provided. The transport device 3 stops transporting the recording medium 7 every time the recording medium 7 is transported for the specified distance F1. The plate device 2 performs printing using the plate while the transport device 3 stops transporting the recording medium 7. The ink ejection device 1 ejects ink to the recording medium 7 passing through the line head 8 by carrying the specified distance F1. When the conveyance of the recording medium 7 is stopped by the conveyance of the specified distance F1, the ink discharge device 1 moves the line head 8 to the moving unit 12 in the Y-axis direction, and prints on the stopped recording medium 7. When the ink ejection device 1 has completed printing in the range of the specified distance F1, the transport device 3 resumes transporting the recording medium 7. Printing by the line head 8 can be performed while the conveyance of the recording medium 7 is stopped for printing by the plate apparatus 2. Overwriting can be performed while the conveyance of the recording medium 7 is stopped. The density of a portion to be printed with ink can be increased without reducing productivity.

  When discharging ink to the recording medium 7 being conveyed and discharging ink to the recording medium 7 being stopped, the control unit 10 controls the ink so that the same color ink lands at the same position a plurality of times. The ink is ejected to the line head 8. Overwriting can be performed while the conveyance of the recording medium 7 is stopped. The density of a portion to be printed with ink can be increased without reducing productivity.

  When ink is ejected onto the recording medium 7 during which conveyance is stopped, the control unit 10 causes the line head 8 to eject ink such that the same color ink lands at the same position a plurality of times. Overwriting can be performed to increase the density of a portion to be printed with ink.

  Further, the printing system 100 includes a maintenance device 9. The maintenance device 9 is provided outside the line head 8 in a direction perpendicular to the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front, and includes a maintenance unit 90. Further, the ink ejection device 1 includes a moving unit 12 that moves the line head 8 in the Z-axis direction, which is the height direction when the printing surface 71 of the recording medium 7 faces the front. The maintenance device 9 includes a first unit moving unit 91 that moves the maintenance unit 90 between the accommodation position and the maintenance execution position. The maintenance execution position is a position below the ejection surface of the line head 8 where the nozzles 81 are exposed and ejects ink, and the maintenance unit 90 performs maintenance. When performing maintenance of the line head 8, the control unit 10 moves the line head 8 to the moving unit 12 in the Z-axis direction and in a direction away from the recording medium 7. The control unit 10 moves the maintenance unit 90 to the first unit moving unit 91 from the accommodation position to the maintenance execution position. The line head 8 can be retracted (moved) in a direction away from the recording medium 7 (conveying line). A space for maintaining the nozzle 81 (ejection surface) of the line head 8 can be created. The line head 8 can be moved away from the recording medium 7 and the maintenance unit 90 can be inserted below the line head 8. The maintenance of the line head 8 can be performed by the inserted maintenance unit 90. It is possible to prevent the occurrence of a problem of ink ejection of the nozzle 81.

  Further, the information processing apparatus 200 according to the embodiment includes an input device 205, a display device 206, an information storage unit 202, and a processing unit 201. The information storage unit 202 stores basic image data D0 used for printing on the recording medium 7. The processing unit 201 divides the basic image data D0 to generate plate printing image data D1 and ink printing image data D2. The plate printing image data D1 is image data in a range that is printed by the plate device 2 that prints using a plate. The ink printing image data D2 is image data of a range to be printed by the ink discharging device 1 that discharges and prints ink.

  According to this configuration, when the ink jet recording apparatus and the plate apparatus 2 are combined, the image data used for printing can be automatically divided into the plate printing image data D1 and the ink printing image data D2. The plate printing image data D1 is image data indicating a range (part) of the image to be printed, which is to be printed by the plate device 2. The ink printing image data D2 is image data indicating a range (part) of the image to be printed, which is to be printed by the ink ejection device 1. The basic image data D0 can be efficiently and easily divided. It is possible to provide the information processing apparatus 200 which is easy to use for the printing system 100 in which the inkjet recording apparatus and the plate apparatus 2 are combined.

  In addition, when the plate printing image data D1 and the ink printing image data D2 are newly generated, the processing unit 201 reduces the cost required for printing using the plate device 2 based on the plate printing image data D1. A predicted printing cost 211, which is a predicted value, is obtained. Based on the image data D2 for ink printing, the processing unit 201 obtains a predicted ink cost 216 that is a predicted value of a cost required for printing using the ink ejection device 1. The processing unit 201 causes the display device 206 to display one or more of the estimated printing cost 211, the estimated ink cost 216, and the total cost of the estimated printing cost 211 and the estimated ink cost 216. The printing cost of the plate device 2 and the printing cost of the ink ejection device 1 can be shown to the user. Information for determining the printing cost can be displayed.

  The processing unit 201 obtains the required number of plates based on the plate printing image data D1. The processing unit 201 obtains a predicted plate manufacturing cost 212 which is a predicted value of the plate manufacturing cost with the obtained number. The processing unit 201 causes the display device 206 to display the calculated estimated production cost 212. The cost of producing the plate can be shown to the user. It is possible to confirm whether the cost required for plate production is appropriate.

  The input device 205 receives an input of the print amount 210. The information storage unit 202 stores the unit price of ink. The processing unit 201 obtains a predicted ink consumption 217, which is a predicted value of an ink consumption required for printing the printing amount 210, based on the input printing amount 210 and the generated ink printing image data D2. Based on the calculated predicted ink consumption 217 and the unit price, the processing unit 201 calculates a predicted ink cost, which is a predicted value of the ink cost required for printing the input print amount 210. The processing unit 201 causes the display device 206 to display the calculated estimated ink cost. The price of the ink consumed by the ink ejection device 1 can be indicated to the user. It is possible to confirm whether the cost of the ink is appropriate.

  The input device 205 receives an input of the print amount 210. Based on the generated plate printing image data D1 and the generated ink printing image data D2, the processing unit 201 obtains a predicted required time 223 which is a predicted value of a time required for printing with the input print amount 210. . The processing unit 201 causes the display device 206 to display the calculated estimated required time 223. The time required for printing the recording medium 7 with the set (input) printing amount 210 can be indicated to the user. It is possible to confirm whether or not printing can be performed in time for the delivery date of the printed matter.

  Further, the processing unit 201 obtains a predicted plate production time 219 which is a predicted value of the time required for plate production. The processing unit 201 causes the display device 206 to display the calculated estimated plate production time 219. The processing unit 201 obtains a predicted print time 221 that is a predicted value of a time required for printing the recording medium 7 of the print amount 210. The processing unit 201 causes the display device 206 to display the calculated estimated printing time 221. When producing a plate based on the plate printing image data D1, the time required for producing the plate can be indicated. The user can check how long it takes to prepare the plate. Also, the time required for actual printing can be confirmed.

  Further, the processing unit 201 causes the display device 206 to display the sum of the estimated plate production time 219 and the estimated printing time 221 as the estimated required time 223. It is possible to confirm the total time of plate production and printing work on the recording medium 7. It is possible to confirm the total time from when the plate is manufactured and printing is started by the plate device 2 and the ink ejection device 1 to when the printing is completed.

  When the input device 205 receives the change in the print amount 210, the processing unit 201 newly obtains the estimated required time 223 required for printing the print amount 210 after the change. The processing unit 201 causes the display device 206 to display the newly calculated estimated required time 223. In response to the change in the print amount 210, a new required time can be indicated immediately. The change result of the print amount 210 is promptly displayed. An easy-to-use information processing device 200 can be provided.

  When the input device 205 receives a change in the number of plates, the processing unit 201 newly generates plate printing image data D1 and ink printing image data D2 according to the input changed plate number. . The number of plates can be changed. The user can set a desired number of plates. New image data D1 for plate printing and image data D2 for ink printing corresponding to the instruction to change the number of plates can be generated. Changes take effect immediately. An easy-to-use information processing device 200 can be provided.

  Further, the input device 205 changes the part of the plate printing image data D1 to the ink printing image data D2, or changes the part of the ink printing image data D2 to the plate printing image data D1. Accept. The processing unit 201 newly generates plate printing image data D1 and ink printing image data D2 in accordance with an operation performed on the input device 205. It is possible to select whether the ink ejection device 1 prints a specific range or the plate device 2 prints. The user can finely set the printing range of the ink ejection device 1 and the printing range of the plate device 2. Settings can be made so that the print range is assigned as desired. In response to the change in the print range, new plate printing image data D1 and ink printing image data D2 can be immediately generated. Changes take effect immediately. An easy-to-use information processing device 200 can be provided.

  Further, the information processing device 200 includes an information communication unit 207 communicably connected to a plate making machine 300 that manufactures a plate used for printing in the plate device 2 based on the received data. When the input device 205 receives an instruction to transmit the plate printing image data D1 to the plate making machine 300, the processing unit 201 causes the information communication unit 207 to transmit the plate printing image data D1 to the plate making machine 300. Data for producing a plate can be directly transmitted to the plate making machine 300. By transmitting the image data D1 for plate printing, the plate device 2 can also start producing a plate.

  Further, the ink ejection device 1 includes a line head 8, a moving unit 12, and a control unit 10. The line head 8 prints an image by discharging ink from the nozzles 81 to the printing surface 71 of the recording medium 7 conveyed to the conveyance device 3 based on the image data D2 for ink printing. The moving unit 12 moves the line head 8 in at least two axial directions. The control unit 10 controls the moving unit 12. One of the two axial directions is the Y-axis direction, which is the transport direction of the recording medium 7 when the printing surface 71 of the recording medium 7 faces the front.

  According to this configuration, the position of the line head 8 can be moved in at least two axial directions. The position of the line head 8 can be moved in the Y-axis direction of the recording medium 7. The position of the line head 8 can be freely changed in a plane. Therefore, the position of the line head 8 can be easily adjusted.

  Further, the installation position of the ink ejection device 1 may be upstream of the plate device 2 in the Y-axis direction. The recording medium 7 printed by the inkjet discharge device can be printed. By simply adding the ink ejection device 1 upstream of the existing plate device 2, it is possible to realize a printing system 100 capable of performing both ink jet printing and textile printing.

  Alternatively, the installation position of the ink ejection device 1 may be downstream of the plate device 2 or between the plate devices 2 in the Y-axis direction. Printing can be performed on the recording medium 7 on which the textile printing has been performed by the inkjet discharge device. The printing system 100 capable of performing both ink jet printing and textile printing can be realized only by adding the ink ejection device 1 in the middle or downstream of the existing plate device 2.

  The transport device 3 stops transporting the recording medium 7 every time the recording medium 7 is transported for the specified distance F1. The ink ejection device 1 prints on the stopped recording medium 7. When the printing by the head 8a is completed, the transport device 3 restarts the transport of the recording medium 7. The conveyance of the recording medium 7 can be resumed in accordance with the completion of the printing on the recording medium 7 which has been stopped (the printing of the unit print range E1) by the ink ejection device 1.

  The printing system 100 (ink ejection device 1) includes a reading device 18 that reads a printing surface 71 and generates photographing data D7. The control unit 10 determines whether or not the specific image is included in the photographing data D7. When determining that the specific image is included, the control unit 10 causes the head 8a to print an image corresponding to the specific image. If a specific image is attached to the recording medium 7 in advance, an image corresponding to the specific image can be automatically printed on the recording medium 7. Setting work related to printing on the recording medium 7 can be reduced.

  The control unit 10 determines whether or not the specific mark is included in the image data D7. When determining that the specific mark is included, the control unit 10 causes the head 8a to print an image corresponding to the specific mark. If a specific mark is given to the recording medium 7 in advance, an image corresponding to the specific image can be automatically printed on the recording medium 7. The mark may be handwritten as long as it can be recognized. The mark may be a seal. Setting work related to printing on the recording medium 7 can be reduced.

  The control unit 10 generates basic image data D0 used for printing based on photographing data obtained by photographing the sample recording medium 7. The control unit 10 causes the head 8a to perform printing on the recording medium 7 based on the basic image data D0 generated based on the photographing data. A sample copy can be printed on the recording medium 7. Copies of the symbols and codes attached to the samples can be printed. Setting work related to printing on the recording medium 7 can be reduced.

  Although the embodiment of the present invention has been described, the scope of the present invention is not limited to this, and various changes can be made without departing from the gist of the invention.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a printing system that prints cloth or paper with an ink ejection device and a plate device.

REFERENCE SIGNS LIST 1 Ink ejection device 10 Control unit 12 Moving unit 14 Floating sensor 15 Operation panel 2 Plate unit 3 Transport device 7 Recording medium 71 Printing surface 7a Floating portion 8 Line head 80 Nozzle row 8a Head 8b Adjusting moving unit 8c Adjusting motor 8d For adjusting Ball screw 8e Adjustment nut 9 Maintenance device 91 First unit moving unit 92 Second unit moving unit 93 Cap unit 94 Wipe unit 95 Discharge unit 96 Wipe motor (blade moving unit)
9a cap 9b blade 9c ink absorber D2 image data for ink printing

Claims (12)

The recording medium is transported by the transport device, and can be added to and removed from a transport line provided with a plate device for printing using the plate,
A line head that prints an image by discharging ink from nozzles on a printing surface of the recording medium conveyed by the conveyance device, based on the ink printing image data;
A moving unit that moves the line head in a Z-axis direction that is a height direction when a printing surface of the recording medium is set to the front,
A maintenance device that is provided outside the line head and includes a maintenance unit, in the X-axis direction that is a direction perpendicular to the transport direction of the recording medium when the printing surface of the recording medium faces the front,
And a control unit,
The maintenance device includes a first unit moving unit that moves the maintenance unit between a storage position and a maintenance execution position,
The maintenance execution position is a position below the ejection surface of the line head where the nozzle is exposed and ejects ink, and the maintenance unit performs maintenance,
When performing maintenance of the line head,
The control unit includes:
Moving the line head to the moving unit in the Z-axis direction and in a direction away from the recording medium;
The ink ejection device, wherein the maintenance unit is moved to the first unit moving unit from the storage position to the maintenance execution position. A plate device for printing using the plate is provided, and is fixed to a conveyance line of a recording medium conveyed by the conveyance device,
A line head that prints an image by discharging ink from nozzles on a printing surface of the recording medium conveyed by the conveyance device, based on the ink printing image data;
A moving unit that moves the head in a Z-axis direction that is a height direction when a printing surface of the recording medium is set to the front,
A maintenance device that is provided outside the line head and includes a maintenance unit in a direction perpendicular to the transport direction of the recording medium when the printing surface of the recording medium is facing the front,
And a control unit,
The maintenance device includes a first unit moving unit that moves the maintenance unit between a storage position and a maintenance execution position,
The maintenance execution position is a position below the ejection surface of the line head where the nozzle is exposed and ejects ink, and the maintenance unit performs maintenance,
When performing maintenance of the line head,
The control unit includes:
Moving the line head to the moving unit in the Z-axis direction and in a direction away from the recording medium;
The ink ejection device, wherein the maintenance unit is moved to the first unit moving unit from the storage position to the maintenance execution position. The line head includes a plurality of heads,
The head is arranged so that a nozzle row is parallel to the X-axis direction,
The nozzle row includes a plurality of the nozzles,
The maintenance device includes a cap unit as the maintenance unit,
The cap unit includes a plurality of caps,
Each of the caps, when the ejection surface of the head is fitted, covers the ejection surface to prevent drying of the ink,
When the predetermined cap condition is met,
The control unit includes:
Moving the cap unit to the first unit moving unit to the maintenance execution position,
The ink ejection device according to claim 1, wherein the head is fitted into the cap. Includes an operation panel that accepts operations,
The cap condition is one or more of the following: the operation panel has received a cap instruction, a predetermined cap time has been reached, and printing has been completed. The ink ejection device according to claim 3. The line head includes a plurality of heads,
The head is arranged so that a nozzle row is parallel to the X-axis direction,
The nozzle row includes a plurality of the nozzles,
The maintenance device includes a wipe unit as the maintenance unit,
The wipe unit includes a plurality of wipe members,
When a predetermined wipe condition is satisfied,
The control unit includes:
Moving the wipe unit to the first unit moving unit toward the maintenance execution position;
The ink ejection apparatus according to claim 1, wherein the nozzle of each of the heads is rubbed by the wipe member. Includes an operation panel that accepts operations,
The wiping condition is that the operation panel has received a wiping instruction, that a predetermined wiping time has been reached, that the cap has not been fitted for a predetermined period of time after the start of printing or immediately after wiping, 6. The ink ejection device according to claim 5, wherein one of or a plurality of printing of a recording medium and a completion of printing are performed.   The ink ejection device according to claim 5, wherein the control unit causes the head to eject ink before rubbing with the wipe. Includes an operation panel that accepts settings,
The wipe member is a blade provided for each head,
The wipe unit includes, for each blade, a blade moving unit that moves the blade in parallel with the nozzle row,
The nozzle row includes a plurality of the nozzles,
When doing a wipe,
The control unit includes:
Move the wipe unit below the line head,
The blade is brought into contact with the discharge surface,
To rub the nozzle, move the blade to the blade moving unit,
8. The blade according to claim 5, wherein when the operation panel receives designation of the head to be wiped, the blade corresponding to the designated head is moved to the blade moving unit. Ink ejection device. The line head includes a plurality of heads,
The head is arranged so that a nozzle row is parallel to the X-axis direction,
The nozzle row includes a plurality of the nozzles,
The maintenance device includes a discharge unit as the maintenance unit,
The discharge unit includes an ink absorber,
When the predetermined discharging conditions are met,
The control unit includes:
Moving the discharge unit to the first unit moving unit toward the maintenance execution position;
Ejecting ink to each of the heads,
The ink ejection device according to any one of claims 1 to 7, wherein the ink ejected from the nozzle is absorbed by the ink absorber.   9. The ink according to claim 8, wherein the ejection condition is one or more of: completion of printing, or elapse of a predetermined time from printing start or previous flushing processing. 10. Discharge device. The maintenance device includes a cap unit, a wipe unit, and a discharge unit as the maintenance unit,
The cap unit, the wipe unit, and the discharge unit are vertically arranged,
The maintenance device includes a second unit moving unit that vertically moves the cap unit, the wipe unit, and the discharge unit,
The control unit includes:
At a position where the unit can be moved below the ejection surface, the used unit, which is the maintenance unit to be used, is moved vertically to the second unit moving unit,
The moving unit is moved to the first unit moving unit toward the maintenance execution position after the moving of the used unit in the up-down direction is completed. Ink ejection device. An ink ejection device according to any one of claims 1 to 11,
The transport device that transports the recording medium,
A printing apparatus that prints the recording medium conveyed by the conveyance apparatus using a plate.