Printer and printing method

Abstract

A printer (10) is provided with: an ejection head (100) in which a plurality of ejection rows (102) having a plurality of ejection ports (101) are arranged in the Y direction; and a control device (20). A control device (20) is provided with: an acquisition unit (23) that acquires image data (DT1) that is used during forward printing and has a plurality of column image data (DT2) prepared for each ejection column (102); a data conversion unit (25) that generates converted image data (DT3) having converted column image data (DT4) obtained by inverting the column image data (DT2) and adding null data (DT10) in return printing so that the ink ejected from the plurality of ejection columns (102) overlap; an outbound print control unit (31) that, on the basis of the image data (DT1), sequentially ejects ink from the ejection column (102) on the other side in the Y direction among the plurality of ejection columns (102), and executes outbound print; and a return path printing control unit (32) that, on the basis of the converted image data (DT3), sequentially ejects ink from the ejection column (102) on one side in the Y direction among the plurality of ejection columns (102), thereby performing return path printing.

Description

TECHNICAL FIELD

[0001] The present application relates to a printer and a printing method. BACKGROUND

[0002] For example, a three-dimensional modeling device is disclosed in Patent Literature 1, which is provided with a jet head that jets a binder to a powder layer composed of a powder material based on image data. In the three-dimensional modeling device, the powder layer is configured to be movable in an X-axis direction with respect to the jet head. In addition, the three-dimensional modeling device is provided with a rail extending in a Y-axis direction. The jet head is engaged with the rail and configured to be movable in the Y-axis direction along the rail.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2017-119363 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] For example, the jet head as described above can jet the binder based on the image data in both of a go way from one side to the other side in the Y-axis direction and a return way from the other side to the one side in the Y-axis direction. In this case, if the binder is jetted using the image data used when the jet head moves in the go way when the jet head moves in the return way, it can not be possible to jet the binder to a desired position.

[0008] The present application was made in view of this, and aims to provide a printer and a printing method that can jet ink to an appropriate position to perform printing when a jet head moves in a go way and a return way in a Y direction.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The printer disclosed herein includes: a worktable supporting a workpiece; a printhead having multiple print columns arranged in a first direction and in a second direction intersecting the first direction; a head moving mechanism for moving the printhead relative to the workpiece supported on the worktable in the second direction; and a control device. Printing when the printhead moves along a path from one side of the second direction to the other is defined as outgoing-path printing, and printing when the printhead moves along a return path from the other side of the second direction to one side is defined as return-path printing. The control device includes an acquisition unit, a data conversion unit, an outgoing-path printing control unit, and a return-path printing control unit. The acquisition unit acquires image data indicating whether ink is being ejected toward a position on the workpiece corresponding to the outgoing path in the second direction, and has multiple column image data prepared for each print column. The data conversion unit generates converted image data for the return-path printing and has converted column image data obtained by reversing the column image data based on the image data. In the re-loop printing, the data conversion unit sequentially references the converted column image data from the jet columns on the other side of the second direction among the plurality of jet columns, adds empty data before the converted column image data, causing the ink ejected from the plurality of jet columns to overlap, and sequentially starts ink ejection from the jet columns on one side of the second direction. The outgoing-path printing control unit, based on the image data acquired by the acquisition unit, sequentially references the column image data from the jet columns on the other side of the second direction among the plurality of jet columns and starts ink ejection, thereby performing the outgoing-path printing. The re-loop printing control unit, based on the converted image data generated by the data conversion unit, sequentially references the converted column image data from the jet columns on the other side of the second direction among the plurality of jet columns, and sequentially starts ink ejection from the jet columns on one side of the second direction, thereby performing the re-loop printing.

[0011] According to the printer described above, in reversible printing, similarly to outgoing printing, the reference to the column image data is sequentially switched from the other side of the second direction's jet column. Based on the switched column image data, the timing of ink jetting is controlled in a way that the ink jetted from multiple jet columns overlaps. Therefore, it is possible to jet ink to the appropriate position in both outgoing and reversible printing.

[0012] The printing method of the present invention is a printing method for a printer. The printer includes: a worktable supporting a workpiece; and a printhead having multiple print columns, the print columns being ink ejection nozzles arranged in a first direction and configured in a second direction intersecting the first direction. Printing when the printhead moves along a path from one side of the second direction to the other is defined as outgoing path printing, and printing when the printhead moves along a return path from the other side of the second direction to one side is defined as return path printing. The printing method includes an acquisition step, a data conversion step, an outgoing path printing control step, and a return path printing control step. In the acquisition step, image data is acquired, the image data indicating whether ink is ejected toward a position of the workpiece corresponding to the outgoing path in the second direction, and multiple column image data are prepared for each print column. In the data conversion step, converted image data is generated for the return path printing, and converted column image data is obtained by reversing the column image data based on the image data. In the data conversion step, during the re-printing, the reference to the converted column image data is sequentially started from the jetting columns on the other side of the second direction among the plurality of jetting columns, and empty data is added before the converted column image data so that the ink ejected from the plurality of jetting columns overlaps, and ink ejection is sequentially started from the jetting columns on one side of the second direction. In the outgoing-path printing control step, based on the image data acquired in the acquisition step, the reference to the column image data is sequentially started from the jetting columns on the other side of the second direction among the plurality of jetting columns, and ink ejection is started, thereby performing the outgoing-path printing. In the re-printing control step, based on the converted image data generated in the data conversion step, the reference to the converted column image data is sequentially started from the jetting columns on the other side of the second direction among the plurality of jetting columns, and ink ejection is sequentially started from the jetting columns on one side of the second direction, thereby performing the re-printing.

[0013] Invention Effects

[0014] According to the present invention, a printer and a printing method are provided that can spray ink to an appropriate position for printing when the print head moves along the Y-direction for both the outgoing and return paths. Attached Figure Description

[0015] Figure 1 This is a perspective view schematically illustrating an embodiment of the printer.

[0016] Figure 2 A three-dimensional view of the nozzle is shown schematically.

[0017] Figure 3 This is a block diagram of a printer.

[0018] Figure 4 This is a right-side view schematically showing the structure of the outbound reference marker and the return reference marker.

[0019] Figure 5 It is a conceptual diagram illustrating image data and the transformation of image data.

[0020] Figure 6 This diagram schematically illustrates the control corresponding to the position of the printhead during outgoing path printing.

[0021] Figure 7A This diagram illustrates the control corresponding to the position of the printhead during reflow printing.

[0022] Figure 7B This diagram illustrates the control corresponding to the position of the printhead during reflow printing.

[0023] Figure 8 It is a flowchart illustrating a series of printing steps performed by a printer. Detailed Implementation

[0024] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that the embodiment described herein is not intended to limit the present invention in any particular way. Furthermore, components and parts that perform the same function will be labeled with the same reference numerals, and repeated descriptions will be omitted or simplified as appropriate.

[0025] Furthermore, in this specification, "printer" includes both two-dimensional and three-dimensional printers. A two-dimensional printer sprays printing ink onto paper, an example of the printed object, to print a two-dimensional image. In other words, a three-dimensional printer refers to a three-dimensional modeling device. A three-dimensional printer shapes a three-dimensional object by spraying a powder material, an example of the printed object, with a curing liquid such as an adhesive or water, causing the powder material to solidify.

[0026] Furthermore, in this specification, in the case of a 2D printer, "the object to be printed" naturally includes various media made of paper such as ordinary paper, as well as media made of resin materials such as polyvinyl chloride (PVC) or polyethylene terephthalate (PET), fabrics, cloth, aluminum, iron, or wood. In the case of a 3D printer, "the object to be printed" includes various materials such as powder materials or powdered materials that serve as the raw materials for 3D models.

[0027] In addition, in this specification, "ink" includes various printing inks such as solvent-based pigment inks, water-based pigment inks, water-based dye inks, and UV-curable pigment inks. "Ink" also includes various liquids such as curing solutions (e.g., adhesives) used when modeling three-dimensional objects. Furthermore, there are no particular restrictions on the method of ink ejection in a printer; for example, inkjet printing can be used.

[0028] Figure 1 This is a schematic perspective view of the printer 10 according to this embodiment. Here, the symbols F, Rr, L, R, U, and D in the drawing represent the front, back, left, right, top, and bottom of the printer 10, respectively. In this embodiment, the printer 10 is arranged in a space represented by an XYZ orthogonal coordinate system of mutually orthogonal X-axis, Y-axis, and Z-axis. Here, the symbols X, Y, and Z represent the direction of the X-axis (X direction), the direction of the Y-axis (Y direction), and the direction of the Z-axis (Z direction), respectively. For example, the X direction, Y direction, and Z direction are the front-back direction, the left-right direction, and the top-bottom direction, respectively. Here, the X direction is an example of a first direction. The Y direction is an example of a second direction intersecting the first direction. In this embodiment, the direction from one side of the Y direction to the other is called the outgoing route Y1. The direction from the other side of the Y direction to one side is called the returning route Y2. One side of the Y direction is, for example, the right. The other side of the Y direction is, for example, the left. The outgoing route Y1 is from right to left. The returning route Y2 is from left to right. However, these directions are only for the purpose of explanation and do not limit the way the printer 10 is set up.

[0029] like Figure 1 As shown, the printer 10 includes a base 12 and a base member 14. The base 12 is a fixing member whose position is fixed. The base 12 extends in both the X and Y directions. For example, the base 12 is a rectangular shape that is longer in the X direction than in the Y direction.

[0030] The base member 14 is fixedly disposed relative to the base 12. At least a portion of the base member 14 is disposed above the base 12, i.e., at a position overlapping the base 12 when viewed from above. In this embodiment, as... Figure 1 As shown, the base member 14 has a main body 14A, a left support 14L, and a right support 14R. The main body 14A is positioned above the base 12 and extends along the Y direction. The main body 14A overlaps with the base 12 when viewed from above. The left support 14L is positioned to the left of the base 12 and extends along the Z direction. The left support 14L supports the main body 14A and is connected to the left end of the main body 14A. The right support 14R is positioned to the right of the base 12 and extends along the Z direction. The right support 14R supports the main body 14A and is connected to the right end of the main body 14A. The main body 14A is supported by the left support 14L and the right support 14R.

[0031] like Figure 1 As shown, printer 10 includes an X-track 16 and a worktable 18. The X-track 16 is disposed on the base 12. Here, the X-track 16 is disposed on the upper surface of the base 12. The X-track 16 extends along the X direction. The number of X-tracks 16 is not particularly limited. Here, the number of X-tracks 16 is two. The two X-tracks 16 are arranged in the Y direction.

[0032] The worktable 18 supports the printed material 200. Here, the worktable 18 extends in both the X and Y directions. The printed material 200 is placed on the upper surface of the worktable 18. In this embodiment, the printer 10 prints on the printed material 200 supported on the worktable 18. In the following description, the printed material 200 refers to the printed material 200 supported on the worktable 18. In this embodiment, the worktable 18 is slidably engaged with the X-track 16. The worktable 18 is configured to move along the X-track 16 in the X direction. Here, the worktable 18 moves along the X direction (e.g., ... Figure 1 When moving in direction B), the worktable 18 is configured to pass under the main body 14A of the base member 14.

[0033] Printer 10 includes printhead 100. Printhead 100 ejects ink. Figure 2 A perspective view of the ejector head 100 is shown schematically. In this embodiment, a plurality of ejection nozzles 101 are formed in the ejector head 100. The ejection nozzles 101 eject ink. The ejection nozzles 101 are formed on the bottom surface of the ejector head 100. The plurality of ejection nozzles 101 are arranged in the X direction. Here, the column of the plurality of ejection nozzles 101 arranged in the X direction is referred to as an ejection column 102. Furthermore, the number of ejection nozzles 101 constituting one ejection column 102 is not particularly limited. Figure 2 For ease of explanation, the number of nozzles 101 constituting the jet train 102 is five, but in reality, the jet train 102 is composed of more nozzles 101.

[0034] like Figure 2As shown, there are multiple jet columns 102. However, the specific number of jet columns 102 is not particularly limited. In this embodiment, there are four jet columns 102. The jet columns 102 include a first jet column 102A, a second jet column 102B, a third jet column 102C, and a fourth jet column 102D. In this embodiment, they are arranged in the order of first jet column 102A, second jet column 102B, third jet column 102C, and fourth jet column 102D from the other side (left in this case) to the other side (right in this case) in the Y direction. Here, the Y-direction intervals of the first jet columns 102A to the fourth jet columns 102D are equal. For example, the interval between the first jet column 102A and the second jet column 102B, the interval between the second jet column 102B and the third jet column 102C, and the interval between the third jet column 102C and the fourth jet column 102D are the same reference interval β. The specific value of the reference interval β is not particularly limited, for example, it is 11 mm.

[0035] In the following description, "ejecting ink from the ejection column 102" means ejecting ink from the plurality of ejection ports 101 constituting the ejection column 102. Different colors of ink are ejected from each ejection column 102. The ink ejected from the ejection column 102 can be, for example, four-color ink, or other than four-color ink, such as spot color ink. In this embodiment, four-color ink is ejected from each ejection column 102. Specifically, the first ejection column 102A ejects black ink. The second ejection column 102B ejects cyan ink. The third ejection column 102C ejects magenta ink. The fourth ejection column 102D ejects yellow ink.

[0036] Figure 3 This is a block diagram of printer 10. (For example...) Figure 3 As shown, the printer 10 includes a moving mechanism 50. The moving mechanism 50 is a mechanism that moves the printable 200, supported on the worktable 18, relative to the print head 100. The moving mechanism 50 includes a head moving mechanism 51 and a printable moving mechanism 52. The head moving mechanism 51 moves the print head 100 along the base member 14 (specifically, the main body 14A, see reference 14). Figure 1The head moving mechanism 51 moves the spray head 100 along the Y-direction path Y1 and return path Y2. The printable material moving mechanism 52 moves the printable material 200 supported on the worktable 18 along the X-track 16 in the X-direction. The printable material moving mechanism 52 moves the printable material 200 supported on the worktable 18 in the X-direction by moving the worktable 18 along the X-track 16. Furthermore, the structures of the head moving mechanism 51 and the printable material moving mechanism 52 are not particularly limited. The head moving mechanism 51 can employ a conventionally known mechanism that moves the spray head 100 in the Y-direction. The printable material moving mechanism 52 can employ a conventionally known mechanism that moves the printable material 200 supported on the worktable 18 in the X-direction.

[0037] In this embodiment, such as Figure 3 As shown, printer 10 includes a control device 20. The control device 20 is a device for performing printing-related controls. The control device 20 comprehensively controls the operation of all parts of printer 10. The structure of the control device 20 is not particularly limited. The control device 20 may be, for example, a microcomputer. The hardware structure of the microcomputer is not particularly limited; for example, it may include an interface (I / F) for receiving image data from external devices such as a host computer, a central processing unit (CPU) for executing control program commands, ROM (Read-Only Memory) for storing the programs executed by the CPU, RAM (Random Access Memory) used as a working area for deploying programs, and storage devices for storing various data such as control programs. Figure 1 As shown, the control device 20 is, for example, installed within the base 12. However, the control device 20 may not be installed within the base 12. For example, the control device 20 may be implemented by a computer or the like installed outside the base 12. In this case, the control device 20 is connected to the control board (not shown) of the printer 10 via a wired or wireless connection in a manner that enables communication.

[0038] In this embodiment, such as Figure 3 As shown, the control device 20 is communicatively connected to the printhead 100 and the moving mechanism 50 (here, the head moving mechanism 51 and the workpiece moving mechanism 52). The control device 20 controls the timing of ink ejection for each print column 102 of the printhead 100. The control device 20 controls the movement of the printhead 100 in the Y direction (here, the outgoing path Y1 and the returning path Y2) by controlling the drive of the head moving mechanism 51. The control device 20 controls the movement of the worktable 18 in the X direction by controlling the drive of the workpiece moving mechanism 52.

[0039] In this embodiment, such as Figure 3 As shown, the control device 20 includes a storage unit 21, an acquisition unit 23, a data conversion unit 25, a detection unit 27, a destination printing control unit 31, and a return printing control unit 32. Each of the units 21 to 32 of the control device 20 can be implemented in hardware or software. Furthermore, each of the units 21 to 32 of the control device 20 can be implemented by one or more processors or by circuitry. The control functions related to the acquisition unit 23, the data conversion unit 25, the detection unit 27, the destination printing control unit 31, and the return printing control unit 32 will be described later.

[0040] Furthermore, in the printer 10 of this embodiment, ink is ejected from the ejection port 101 of the ejection head 100 toward the workpiece 200 supported on the worktable 18 when the ejection head 100 moves along the Y direction. Thus, printing is performed on the workpiece 200 by ejecting ink onto it. In this embodiment, printing is performed by ejecting ink from the ejection port 101 when the ejection head 100 moves along the Y-direction path Y1 and also when the ejection head 100 moves along the Y-direction path Y2. Here, the printing performed by ejecting ink from the ejection port 101 when the ejection head 100 moves along the Y-direction path Y1 is called outward path printing. The printing performed by ejecting ink from the ejection port 101 when the ejection head 100 moves along the Y-direction path Y2 is called return path printing.

[0041] In this embodiment, such as Figure 1 As shown, the printer 10 includes a outgoing reference mark 41, a returning reference mark 42, and a sensor 306. The outgoing reference mark 41 indicates the position that serves as the reference for the start of outgoing printing. Here, the timing of ink ejection from each jet column 102 (here, the first jet column 102A to the fourth jet column 102D) during outgoing printing is determined based on the outgoing reference mark 41. The returning reference mark 42 indicates the position that serves as the reference for the start of returning printing. Here, the timing of ink ejection from each jet column 102 (here, the first jet column 102A to the fourth jet column 102D) during returning printing is determined based on the returning reference mark 42. The sensor 306 detects the Y-direction positions of the outgoing reference mark 41 and the returning reference mark 42.

[0042] Furthermore, the positions of the outbound reference mark 41 and the return reference mark 42 are not particularly limited as long as they are detectable by the sensor 306. Here, the outbound reference mark 41 and the return reference mark 42 are arranged in the Y direction. In this embodiment, as... Figure 1As shown, a outgoing reference mark 41 and a returning reference mark 42 are provided on the base member 14. Here, the outgoing reference mark 41 is provided on the printing start side (here, the right side) of the base member 14, with reference to the worktable 18. The outgoing reference mark 41 is provided at the right end of the main body portion 14A of the base member 14. The outgoing reference mark 41 is positioned to the right of the worktable 18 and is located on the portion of the main body portion 14A to the right of the worktable 18. The returning reference mark 42 is provided on the printing start side (here, the left side) of the base member 14, with reference to the worktable 18. The returning reference mark 42 is provided on the left end of the main body portion 14A of the base member 14. The returning reference mark 42 is positioned to the left of the worktable 18 and is located on the portion of the main body portion 14A to the left of the worktable 18. The returning reference mark 42 is located to the left of the outgoing reference mark 41.

[0043] There are no particular restrictions on the specific types of outbound reference mark 41 and return reference mark 42. Figure 4 This is a right-side view schematically showing the structure of the outbound reference mark 41 and the return reference mark 42. In this embodiment, as... Figure 4 As shown, the outgoing reference mark 41 and the returning reference mark 42 are formed by a light-shielding plate in an L-shape. The outgoing reference mark 41 and the returning reference mark 42 have the same structure. The outgoing reference mark 41 and the returning reference mark 42 each have a support plate 25a extending forward from the base member 14 (here, the main body 14A) and a detection plate 25b supported on the support plate 25a. The detection plate 25b extends downward from the support plate 25a. The detection plate 25b is disposed separately from the base member 14 (e.g., the main body 14A). The detection plate 25b is positioned forward of the base member 14.

[0044] like Figure 1 As shown, sensor 306 is disposed on the injection head 100. Therefore, sensor 306 is configured to move along the Y direction with the injection head 100. In this embodiment, sensor 306 is disposed at the left end of the injection head 100. Sensor 306 protrudes upwards beyond the injection head 100. However, the position of sensor 306 relative to the injection head 100 is not particularly limited. For example, sensor 306 may also be disposed in the central portion of the injection head 100 in the Y direction. Sensor 306 may also be configured to protrude further in the Y direction than the injection head 100 (e.g., to the left or right). In this embodiment, as... Figure 3As shown, the control device 20 and the sensor 306 are connected in a communicative manner. The control device 20 can detect the presence or absence of the outbound reference mark 41 and the return reference mark 42 through the sensor 306. In addition, the control device 20 can detect the Y-direction position of the outbound reference mark 41 and the Y-direction position of the return reference mark 42 through the sensor 306.

[0045] The type and structure of sensor 306 are not particularly limited. In this embodiment, sensor 306 is a light interruptor. Here, as... Figure 4 As shown, the sensor 306 has a light-emitting portion 306a that emits light and a light-receiving portion 306b that receives light. The light-emitting portion 306a and the light-receiving portion 306b are paired. For example, the light-emitting portion 306a and the light-receiving portion 306b are arranged separately in the X direction. The light-receiving portion 306b receives light emitted from the light-emitting portion 306a. In this embodiment, when the jet head 100 moves in the Y direction, the outgoing reference mark 41 or the returning reference mark 42 (more specifically, the detection plate 25b of the outgoing reference mark 41 or the returning reference mark 42) passes between the light-emitting portion 306a and the light-receiving portion 306b of the sensor 306. Here, if the outgoing reference mark 41 or the returning reference mark 42 is arranged between the light-emitting portion 306a and the light-receiving portion 306b, the light emitted from the light-emitting portion 306a is blocked by the detection plate 25b and therefore does not reach the light-receiving portion 306b. Thus, when the light-receiving unit 306b cannot receive the light emitted from the light-emitting unit 306a, the sensor 306 can detect the outgoing reference mark 41 or the returning reference mark 42. At this time, the control device 20 detects the Y-direction position of the outgoing reference mark 41 and the Y-direction position of the returning reference mark 42 based on the Y-direction position of the sensor 306.

[0046] Furthermore, in this embodiment, the position of sensor 306 in the Y direction when it detects the outgoing reference mark 41 is referred to as the outgoing detection position P2 (refer to...). Figure 6 The position of sensor 306 in the Y direction when it detects the back-path reference mark 42 is called the back-path detection position P4 (refer to...). Figure 7A ).

[0047] Figure 5 This is a conceptual diagram illustrating image data DT1 and converted image data DT3. In this embodiment, printer 10 is based on... Figure 5The image data DT1 shown is used to control the timing of ink jetting and to print on the workpiece 200. Here, the pre-prepared image data DT1 is the data used during forward printing, specifically the data used during printing when the jet head 100 moves along the forward path Y1 (i.e., from right to left) in the Y direction. Image data DT1 has column image data DT2 for each jet column 102. Here, image data DT1 has a first column image data DT21 corresponding to the first jet column 102A, a second column image data DT22 corresponding to the second jet column 102B, a third column image data DT23 corresponding to the third jet column 102C, and a fourth column image data DT24 corresponding to the fourth jet column 102D as column image data DT2. Furthermore, for ease of explanation, in each column image data DT2, data is... Figure 5 The numbers on the paper are arranged from right to left in the order of 1, 2, 3, 4.

[0048] Each column of image data DT2 indicates the position of the printed object 200 corresponding to the path Y1 in the Y direction, indicating whether or not ink is being sprayed. Here, each column of image data DT2 contains data related to the spraying of ink onto the portion of the printed object 200 corresponding to the position in the Y direction of the spray column 102 (e.g., data related to the presence or absence of spraying). Therefore, the column image data DT2 can be continuous data from right to left in the Y direction. Figure 5 In one example, the image data in each column DT2 is processed in the order of 1, 2, 3, 4.

[0049] Figure 6 This diagram schematically illustrates the control corresponding to the position of the printhead 100 during outgoing path printing. In this embodiment, as... Figure 6 As shown, during outgoing path printing, the first jetting columns 102A to the fourth jetting columns 102D begin printing based on column image data DT2 at a predetermined outgoing path reference position P1 in the Y direction. Here, the outgoing path reference position P1 is the same position as the outgoing path reference position P6. During outgoing path printing, the first jetting columns 102A to the fourth jetting columns 102D begin referencing the column image data DT2 when passing the predetermined outgoing path reference position P6 in the Y direction. That is, during outgoing path printing, the start of printing based on column image data DT2 and the start of referencing the column image data DT2 are performed simultaneously.

[0050] In outgoing printing, the ink jetting column 102, starting from the one located on the opposite side (in this case, the left side) of the Y-direction among the multiple jetting columns 102, sequentially passes through the outgoing reference position P1. Specifically, during outgoing printing, the ink jetting column 102A, the second jetting column 102B, the third jetting column 102C, and the fourth jetting column 102D pass through the outgoing reference position P1 in that order. Therefore, during outgoing printing, printing begins in the order of the first jetting column 102A, the second jetting column 102B, the third jetting column 102C, and the fourth jetting column 102D (in other words, the control of ink jetting). In this embodiment, the outgoing reference position P1 and the outgoing reference position P6 are determined based on the outgoing detection position P2 of the outgoing reference mark 41. Here, the outgoing reference position P1 and the outgoing reference position P6 are located to the left of the outgoing detection position P2.

[0051] Next, the control sequence during outgoing path printing will be explained. Outgoing path printing is performed by... Figure 3 The outgoing path printing control unit 31 is implemented. In outgoing path printing, the sensor 306, located on the print head 100, starts when it is positioned to the right of the outgoing path reference mark 41. Here, firstly, the outgoing path printing control unit 31 controls the head moving mechanism 51 (see reference 51). Figure 3 This causes the nozzle 100 to move along the Y-direction path Y1. Afterwards, Figure 3 When the detection unit 27 moves along the path Y1 of the spray head 100, if Figure 6 As in state S10, sensor 306 detects the path detection position P2 in path reference mark 41 by passing through path reference mark 41.

[0052] In this embodiment, after the sensor 306 detects the outgoing route reference mark 41, the injection head 100 is moved from the outgoing route detection position P2 as follows: Figure 6 When the first jetting column 102A moves a predetermined first moving distance D1 along the destination Y1 as in state S11, its position in the Y direction is called the destination reference position P1. Here, the first moving distance D1 refers to the initial distance α. The specific value of the initial distance α is not particularly limited, for example, it is 17.6 mm. As in state S11, the destination printing control unit 31 moves the jetting head 100 from the destination detection position P2 along the destination Y1 by the first moving distance D1. When the first jetting column 102A passes the destination reference position P1, the printing based on the first column image data DT21 of the first jetting column 102A begins. Here, after moving the jetting head 100 from the destination detection position P2 along the destination Y1 by the first moving distance D1, the destination printing control unit 31 controls the jetting of ink (here, black ink) from the first jetting column 102A to the printed object 200 based on the first column image data DT21.

[0053] In this embodiment, such as Figure 6 As in state S11, after the first jet column 102A reaches the destination reference position P1, when the jet head 100 moves further along the destination Y1 by the interval between the first jet column 102A and the second jet column 102B, i.e., the reference interval β, the position of the second jet column 102B in the Y direction becomes the destination reference position P1, as in state S12. Here, the position of the second jet column 102B in the Y direction when the jet head 100 moves from the destination detection position P2 along the destination Y1 by a predetermined second moving distance D2 becomes the destination reference position P1. Here, the second moving distance D2 is longer than the first moving distance D1. The second moving distance D2 is, for example, the initial distance α + the reference interval β. In this embodiment, the destination printing control unit 31 moves the jet head 100 from the destination detection position P2 along the destination Y1 by the second moving distance D2, and when the second jet column 102B passes the destination reference position P1, printing based on the second column image data DT22 of the second jet column 102B begins. Here, after the print head 100 moves a second travel distance D2 from the print head 100 along the print head Y1 from the print head detection position P2, the print head 100 moves along the print head Y1 while simultaneously controlling the ejection of ink (here, cyan ink) from the second ejection column 102B to the printable 200 based on the second column image data DT22. At this time, the cyan ink ejected from the second ejection column 102B is ejected in a manner that overlaps with the black ink already ejected onto the printable 200.

[0054] like Figure 6As shown in state S12, after the second jet column 102B reaches the destination reference position P1, when the jet head 100 moves further along the destination Y1 by the interval between the second jet column 102B and the third jet column 102C, i.e., the reference interval β, the position of the third jet column 102C in the Y direction becomes the destination reference position P1, as in state S13. Here, the position of the third jet column 102C in the Y direction when the jet head 100 moves a predetermined third moving distance D3 along the destination Y1 from the destination detection position P2 becomes the destination reference position P1. Here, the third moving distance D3 is longer than the first moving distance D1 and the second moving distance D2. The third moving distance D3 is, for example, the initial distance α + reference interval β × 2. In this embodiment, the destination printing control unit 31 moves the jet head 100 from the destination detection position P2 along the destination Y1 by the third moving distance D3, and when the third jet column 102C passes the destination reference position P1, the printing based on the third column image data DT23 of the third jet column 102C begins. Here, after the print head 100 moves a third travel distance D3 from the print head 100 along the print head Y1 from the print head detection position P2, the print head 100 moves along the print head Y1 while simultaneously controlling the ejection of ink (in this case, magenta ink) from the third ejection column 102C to the printable 200 based on the third column image data DT23. At this time, the magenta ink ejected from the third ejection column 102C is ejected in a manner that overlaps with the black and cyan inks already ejected onto the printable 200.

[0055] like Figure 6As shown in state S13, after the third jet train 102C reaches the destination reference position P1, when the jet head 100 moves further along the destination Y1 by the interval between the third jet train 102C and the fourth jet train 102D, i.e., the reference interval β, the position of the fourth jet train 102D in the Y direction becomes the destination reference position P1, as in state S14. Here, the position of the fourth jet train 102D in the Y direction when the jet head 100 moves from the destination detection position P2 along the destination Y1 by a predetermined fourth moving distance D4 becomes the destination reference position P1. Here, the fourth moving distance D4 is longer than the first moving distance D1 to the third moving distance D3. The fourth moving distance D4 is, for example, the initial distance α + reference interval β × 3. In this embodiment, the outgoing path printing control unit 31 moves the ejector head 100 a fourth travel distance D4 from the outgoing path detection position P2 along the outgoing path Y1. When the fourth ejector column 102D passes the outgoing path reference position P1, printing based on the fourth column image data DT24 is started by the fourth ejector column 102D. Here, after moving the ejector head 100 a fourth travel distance D4 from the outgoing path detection position P2 along the outgoing path Y1, the outgoing path printing control unit 31 controls the ejection of ink (here, yellow ink) from the fourth ejector column 102D to the printed object 200 based on the fourth column image data DT24. At this time, the yellow ink ejected from the fourth ejector column 102D is ejected in a manner that overlaps with the black ink, cyan ink, and magenta ink that have already been ejected onto the printed object 200. As described above, outgoing path printing can be performed appropriately based on the image data DT1.

[0056] However, during reflow printing, the print head 100 prints while moving from left to right in the Y direction. The image data DT2 of each column of the aforementioned image data DT1 (refer to...) Figure 5 This is the data used for outgoing printing, and it assumes that the print head 100 moves from right to left in the Y direction. Therefore, assuming we want to base it on... Figure 5If the image data DT1 is used for recirculation printing, a left-right reversed image compared to the image printed during outgoing printing may be printed on the workpiece 200. Furthermore, during recirculation printing, the ejector head 100 moves along the recirculation path Y2, passing through any position in the Y direction in the order of the fourth ejector column 102D, the third ejector column 102C, the second ejector column 102B, and the first ejector column 102A. Here, it is assumed, for example, that the same control is performed during recirculation printing as during outgoing printing, i.e., ink ejection control begins according to the distance the ejector head 100 has moved along the recirculation path Y2, in the order of the first ejector column 102A, the second ejector column 102B, the third ejector column 102C, and the fourth ejector column 102D. In this case, for example, after the control of ink ejection in the first ejector column 102A has begun, the control of ink ejection in the second ejector column 102B can begin after the ejector head 100 has moved a reference interval β along the recirculation path Y2. Therefore, in image data DT1, although black ink, cyan ink, magenta ink, and yellow ink are sprayed onto any part of the printed material 200 in an overlapping manner, in actual reflow printing, black ink, cyan ink, magenta ink, and yellow ink may also be sprayed separately.

[0057] Therefore, in this embodiment, the control device 20 performs different control during return printing than during outgoing printing. Here, return printing is controlled by... Figure 3 The return printing control unit 32 is implemented. Figure 7A as well as Figure 7B This diagram schematically illustrates the control corresponding to the position of the printhead 100 during recirculation printing. In this embodiment, during recirculation printing, the first printhead columns 102A to the fourth printhead columns 102D reach a predetermined recirculation reference position P3 (refer to...) in the Y direction. Figure 7A The ink jetting is controlled by timing the ink jetting. In recirculation printing, the ink jetting column 102, starting from the one on the Y-direction side (here, the right side), sequentially reaches the recirculation reference position P3. Specifically, during recirculation printing, the ink jetting column 102 passes through the recirculation reference position P3 in the order of the fourth ink jetting column 102D, the third ink jetting column 102C, the second ink jetting column 102B, and the first ink jetting column 102A. Therefore, during recirculation printing, printing begins in the order of the fourth ink jetting column 102D, the third ink jetting column 102C, the second ink jetting column 102B, and the first ink jetting column 102A (in other words, the ink jetting is controlled). In this embodiment, the recirculation reference position P3 is determined based on the recirculation detection position P4 of the recirculation reference mark 42. Here, the recirculation reference position P3 is located to the right of the recirculation detection position P4.

[0058] In this embodiment, such as Figure 5As shown, the image data DT1 used for outgoing printing is converted to generate converted image data DT3 used for return printing. That is, converted image data DT3 is generated based on image data DT1. Converted image data DT3 is the data used during return printing, specifically during printing when the print head 100 moves along the return path Y2 (i.e., from left to right) in the Y direction. Converted image data DT3 has converted column image data DT4 for each print column 102. Here, converted image data DT3 has a first converted column image data DT41 corresponding to the first print column 102A, a second converted column image data DT42 corresponding to the second print column 102B, a third converted column image data DT43 corresponding to the third print column 102C, and a fourth converted column image data DT44 corresponding to the fourth print column 102D as converted column image data DT4.

[0059] In this embodiment, the generation of the converted image data DT3 is performed by... Figure 3 The data conversion unit 25 performs this operation. The data conversion unit 25 generates converted column image data DT4 by inverting the column image data DT2 of image data DT1. Here, column image data DT2 is data along the Y direction. Inverting column image data DT2 means reversing column image data DT2 in the Y direction (in this case, reversing it horizontally). Figure 5 As shown, in the image data DT2, the data is arranged from right to left in the order of 1, 2, 3, 4. In the transformed image data DT4 obtained by reversing the image data DT2, the data... Figure 5 The numbers are arranged from left to right on the paper in the order of 1, 2, 3, 4.

[0060] Here, the data conversion unit 25 generates first converted column image data DT41 by inverting the first column image data DT21. The data conversion unit 25 also generates second converted column image data DT42 by inverting the second column image data DT22. Similarly, the data conversion unit 25 generates third converted column image data DT43 by inverting the third column image data DT23, and generates fourth converted column image data DT44 by inverting the fourth column image data DT24.

[0061] Furthermore, in this embodiment, the timing for starting the reference to convert image data DT3 during recirculation printing is substantially the same as the timing for starting the reference to convert image data DT1 during outgoing printing. During recirculation printing, the sensor 306, located on the print head 100, starts when it is positioned to the left of the recirculation reference mark 42. Here, firstly, the recirculation printing control unit 32 controls the head movement mechanism 51 (refer to...) Figure 3This causes the injection head 100 to move along the return path Y2 in the Y direction. Afterwards, Figure 3 When the detection unit 27 moves along the return path Y2 with the spray head 100, if Figure 7A As in state S20, sensor 306 detects the return detection position P4 in return reference mark 42 via return reference mark 42.

[0062] In this embodiment, during recirculation printing, a recirculation reference position P5 (reference) is predetermined to serve as the reference for starting the conversion of column image data DT4. Figure 7A Here, as Figure 7A As shown, the return reference position P5 has a first return reference position P51 that refers to the start of the first conversion column image data DT41, a second return reference position P52 that refers to the start of the second conversion column image data DT42, a third return reference position P53 that refers to the start of the third conversion column image data DT43, and a fourth return reference position P54 that refers to the start of the fourth conversion column image data DT44. The return reference position P5 (here, the first return reference position P51, the second return reference position P52, the third return reference position P53, and the fourth return reference position P54) is located to the left of the return reference position P3, which controls the start of ink ejection, or at the same position as the return reference position P3 during return printing.

[0063] Here, as Figure 7A As in state S21, the position of the first jet column 102A in the Y direction when the jet head 100 has moved a first movement distance D1 from the return detection position P4 along the return path Y2 is designated as the first return reference position P51. As described above, the first movement distance D1 is the initial distance α. The return printing control unit 32, as in state S21, moves the jet head 100 from the return detection position P4 along the return path Y2 by a first movement distance D1. When the first jet column 102A passes the first return reference position P51, it begins referencing the first conversion column image data DT41. Furthermore, after the first jet column 102A reaches the first return reference position P51, as... Figure 7AAs in state S22, when the nozzle 100 moves further along the return path Y2 by the distance between the first nozzle column 102A and the second nozzle column 102B, i.e., the reference distance β, the position of the second nozzle column 102B in the Y direction becomes the second return path reference position P52. Here, when the nozzle 100 moves a second moving distance D2 along the return path Y2 from the return path detection position P4, the position of the second nozzle column 102B in the Y direction becomes the second return path reference position P52. As in state S22, the return path printing control unit 32 moves the nozzle 100 from the return path detection position P4 along the return path Y2 by a second moving distance D2. When the second nozzle column 102B passes the second return path reference position P52, it begins referencing the second conversion column image data DT42. As described above, the second moving distance D2 is the initial distance α + the reference distance β.

[0064] After the second jet train 102B reaches the second return route reference position P52, as Figure 7A As in state S23, when the nozzle 100 moves further along the return path Y2 by the interval between the second nozzle column 102B and the third nozzle column 102C, i.e., the reference interval β, the position of the third nozzle column 102C in the Y direction becomes the third return path reference position P53. Here, when the nozzle 100 moves a third moving distance D3 along the return path Y2 from the return path detection position P4, the position of the third nozzle column 102C in the Y direction becomes the third return path reference position P53. As in state S23, the return path printing control unit 32 moves the nozzle 100 from the return path detection position P4 along the return path Y2 by a third moving distance D3, and when the third nozzle column 102C passes the third return path reference position P53, it starts referencing the third conversion column image data DT43. Furthermore, as described above, the third moving distance D3 is the initial distance α + reference interval β × 2. Furthermore, after the third nozzle column 102C reaches the third return path reference position P53, as Figure 7A As in state S24, when the ejector head 100 moves further along the return path Y2 by the interval between the third ejector column 102C and the fourth ejector column 102D, i.e., the reference interval β, the position of the fourth ejector column 102D in the Y direction becomes the fourth return path reference position P54. Here, when the ejector head 100 moves a fourth movement distance D4 along the return path Y2 from the return path detection position P4, the position of the fourth ejector column 102D in the Y direction becomes the fourth return path reference position P54. As in state S24, the return path printing control unit 32 moves the ejector head 100 from the return path detection position P4 by a fourth movement distance D4, and when the fourth ejector column 102D passes the fourth return path reference position P54, it begins referencing the fourth conversion column image data DT44. Furthermore, as described above, the fourth movement distance D4 is the initial distance α + reference interval β × 3.

[0065] In this embodiment, the return printing control unit 32 controls ink ejection based on the timing of the conversion column image data DT4 when it begins referencing the conversion column image data DT4. However, in this embodiment, as... Figure 7A As shown, the first return reference position P51, the second return reference position P52, and the third return reference position P53 are located to the left of the return reference position P3, where ink ejection begins during return printing. The fourth return reference position P54 is at the same position as the return reference position P3 in the Y direction. In this embodiment, ink ejection based on the conversion image data DT4 of each conversion column image data DT3 begins after the first ejection column 102A to the fourth ejection column 102D have passed the return reference position P3. Therefore, ink is not ejected from the first ejection column 102A until it moves from the first return reference position P51 to the return reference position P3. Similarly, ink is not ejected from the second ejection column 102B until it moves from the second return reference position P52 to the return reference position P3. In addition, ink is not ejected from the third jet column 102C before it moves from the third return reference position P53 to the return reference position P3.

[0066] Therefore, in this embodiment, as Figure 7A As shown, the data conversion unit 25 adds empty data DT10 to the conversion column image data DT4, so that even when referring to the conversion column image data DT4, ink is not ejected before the ejection column 102 reaches the return reference position P3. In return printing, the data conversion unit 25 sequentially starts referencing the conversion column image data DT4 from the first ejection column 102A (in this case, the left side) on the other side of the Y direction among the plurality of ejection columns 102, and adds empty data DT10 before the conversion column image data DT4, so that the ink ejected from the plurality of ejection columns 102 overlaps. In this embodiment, the data conversion unit 25 adds empty data DT10 to the first conversion column image data DT41, so that the first ejection column 102A refers to the empty data DT10 during its movement from the first return reference position P51 to the return reference position P3. Here, the empty data DT10 added to the first conversion column image data DT41 is added before the first conversion column image data DT41. The length of the empty data DT10 added to the first conversion column image data DT41 corresponds to the length of the first jet column 102A from the first return reference position P51 to the return reference position P3 during return printing. The length of the empty data DT10 added to the first conversion column image data DT41 is, for example, the reference interval β×6.

[0067] The data conversion unit 25 adds empty data DT10 to the second conversion column image data DT42, so that the empty data DT10 is referenced during the period when the second jet column 102B moves from the second return reference position P52 to the return reference position P3. Here, the empty data DT10 added to the second conversion column image data DT42 is added before the second conversion column image data DT42. The length of the empty data DT10 added to the second conversion column image data DT42 corresponds to the length of the second jet column 102B moving from the second return reference position P52 to the return reference position P3 during return printing. The length of the empty data DT10 added to the second conversion column image data DT42 is, for example, a reference interval β×4. In addition, the data conversion unit 25 adds empty data DT10 to the third conversion column image data DT43, so that the empty data DT10 is referenced during the period when the third jet column 102C moves from the third return reference position P53 to the return reference position P3. Here, the empty data DT10 added to the third conversion column image data DT43 is added before the third conversion column image data DT43. The length of the empty data DT10 added to the third conversion column image data DT43 corresponds to the length of the third jet column 102C moving from the third return reference position P53 to the return reference position P3 during return printing. The length of the empty data DT10 added to the third conversion column image data DT43 is, for example, the reference interval β×2. Furthermore, in Figure 5 The illustration of the empty data DT10 added to the first transformation column image data DT41 to the third transformation column image data DT43 is omitted.

[0068] Furthermore, in this embodiment, such as Figure 7A As shown, as described above, the fourth return reference position P54 is at the same position in the Y direction as the return reference position P3. Therefore, no empty data DT10 is added to the fourth conversion column image data DT44. As described above, the data conversion unit 25 generates converted image data DT3, which includes the first conversion column image data DT41 to the fourth conversion column image data DT44 with the empty data DT10 added.

[0069] In this embodiment, such as Figure 7AAs in state S20, sensor 306 detects the return reference mark 42. As in state S21, after the print head 100 has moved a first travel distance D1 from the return detection position P4 along the return path Y2, when the first print column 102A passes the first return reference position P51, the return printing control unit 32 begins referencing the first conversion column image data DT41. Here, during the period when the first print column 102A moves from the first return reference position P51 to the return reference position P3, the empty data DT10 added to the first conversion column image data DT41 is referenced. Therefore, control of ink ejection from the first print column 102A does not begin before the first print column 102A passes the return reference position P3. Here, after the first print column 102A reaches the first return reference position P51, when the print head 100 moves further along the return path Y2, as... Figure 7A As in state S22, the second jet train 102B reaches the second return reference position P52. When the second jet train 102B passes the second return reference position P52, the return printing control unit 32 begins referencing the second conversion column image data DT42. During the movement of the second jet train 102B from the second return reference position P52 to the return reference position P3, the empty data DT10 added to the second conversion column image data DT42 is referenced. Therefore, control of ink ejection from the second jet train 102B does not begin until the second jet train 102B passes the return reference position P3.

[0070] Here, after the second jet train 102B reaches the second return path reference position P52, when the jet head 100 moves further along the return path Y2, as... Figure 7A As in state S23, the third jet train 102C reaches the third return reference position P53. When the third jet train 102C passes the third return reference position P53, the return printing control unit 32 begins referencing the third conversion column image data DT43. Here, during the period when the third jet train 102C moves from the third return reference position P53 to the return reference position P3, the empty data DT10 added to the third conversion column image data DT43 is referenced. Therefore, control of ink ejection from the third jet train 102C does not begin until the third jet train 102C passes the return reference position P3.

[0071] In this embodiment, after the third jet train 102C reaches the third return path reference position P53, when the jet head 100 moves further along the return path Y2, as... Figure 7AAs in state S24, the fourth jet train 102D reaches the fourth return reference position P54. When the fourth jet train 102D passes the fourth return reference position P54, the return printing control unit 32 begins referencing the fourth conversion column image data DT44. Here, the fourth return reference position P54 and the return reference position P3 are the same position. Therefore, at the fourth return reference position P54, printing based on the fourth conversion column image data DT44 by the fourth jet train 102D begins. Here, as... Figure 7B As shown in state S24, after the fourth jet column 102D passes the return reference position P3, the return printing control unit 32 moves the jet head 100 along the return path Y2 and controls the jetting of ink (here, yellow ink) from the fourth jet column 102D to the printed object 200 based on the fourth conversion column image data DT44.

[0072] Here, as in state S24, after the fourth jet train 102D reaches the return path reference position P3, when the jet head 100 moves further along the return path Y2 by the reference interval β, as... Figure 7B As in state S25, the third jet train 102C reaches the return reference position P3. After the third jet train 102C passes the return reference position P3, the return printing control unit 32, while moving the jet head 100 along the return path Y2, controls the jetting of ink (in this case, magenta ink) from the third jet train 102C to the printable 200 based on the third conversion column image data DT43. At this time, the magenta ink jetted from the third jet train 102C is jetted in a manner that overlaps with the yellow ink already jetted onto the printable 200.

[0073] As in state S25, after the third jet train 102C reaches the return path reference position P3, when the jet head 100 moves further along the return path Y2 by the reference interval β, as... Figure 7B As in state S26, the second jet train 102B reaches the return reference position P3. After the second jet train 102B passes the return reference position P3, the return printing control unit 32, while moving the jet head 100 along the return path Y2, controls the jetting of ink (in this case, cyan ink) from the second jet train 102B to the printable 200 based on the second conversion column image data DT42. At this time, the cyan ink jetted by the second jet train 102B is jetted in a manner that overlaps with the yellow and magenta inks already jetted onto the printable 200.

[0074] Here, as in state S26, after the second jet train 102B reaches the return reference position P3, when the jet head 100 moves further along the return path Y2 by the reference interval β, as... Figure 7BAs in state S27, the first jetting column 102A reaches the return reference position P3. After the first jetting column 102A passes the return reference position P3, the return printing control unit 32, while moving the jetting head 100 along the return path Y2, controls the jetting of ink (here, black ink) from the first jetting column 102A to the printable object 200 based on the first conversion column image data DT41. At this time, the black ink jetted by the first jetting column 102A is jetted in a manner that overlaps with the yellow, magenta, and cyan inks already jetted onto the printable object 200. As described above, return printing can be appropriately performed based on the conversion image data DT3.

[0075] Next, according to Figure 8 The flowchart briefly illustrates the series of printing steps performed by printer 10.

[0076] In this embodiment, firstly in Figure 8 In step S101, Figure 3 The acquisition unit 23 acquires image data DT1 based on an image of an object printed on the printable surface 200. The destination for acquiring the image data DT1 is not particularly limited. In this embodiment, the image data DT1 is pre-stored in the storage unit 21 of the printer 10. Therefore, the acquisition unit 23 acquires the image data DT1 from the storage unit 21.

[0077] Next, in Figure 8 In step S103, Figure 3 The data conversion unit 25 generates converted image data DT3 based on the image data DT1 acquired by the acquisition unit 23. In this embodiment, outgoing printing and return printing are performed alternately. Image data DT1 may contain both outgoing printing image data DT1 and return printing image data DT1. Therefore, in this embodiment, the data conversion unit 25 generates converted image data DT3 based on the return printing image data DT1 within the image data DT1. Here, the data conversion unit 25, in the return printing image data DT1, such as... Figure 5 As shown, transformed column image data DT4 (here, first transformed column image data DT41 to fourth transformed column image data DT44) is generated by reversing column image data DT2 (here, first column image data DT21 to fourth column image data DT24). Additionally, as... Figure 7A As shown, the data conversion unit 25 appropriately adds empty data DT10 to the converted column image data DT4. As described above, converted image data DT3 is generated based on the image data DT1 used for return printing. Furthermore, the converted image data DT3 generated by the data conversion unit 25 is stored in... Figure 3 Storage section 21.

[0078] Next, inFigure 8 In step S105, printing is performed on the printable object 200. A detailed explanation has been given above, therefore, it is omitted here. Figure 3 The outgoing path printing control unit 31 performs outgoing path printing based on image data DT1. After outgoing path printing, the control device 20 controls the printed material movement mechanism 52 (see reference). Figure 3 This allows the printed object 200, supported on the worktable 18, to move in the X direction. Afterwards, Figure 3 The re-path printing control unit 32 performs re-path printing based on the converted image data DT3. After re-path printing, the control device 20 moves the workpiece 200 supported on the worktable 18 in the X direction. Then, outgoing path printing is performed based on the next image data DT1. In this way, printing on the workpiece 200 can be performed by repeatedly executing outgoing path printing, movement of the workpiece 200 in the X direction, re-path printing, and movement of the workpiece 200 in the X direction.

[0079] In this embodiment, as described above... Figure 1 As shown, the printer 10 includes a worktable 18 supporting the printed material 200, a print head 100, and a head moving mechanism 51 (see reference). Figure 3 ) and control device 20. For example Figure 2 As shown, the inkjet head 100 has multiple ink jet rows 102, which are formed by arranging ink jet nozzles 101 in the X direction and in the Y direction, which intersects the X direction. The head moving mechanism 51 moves the inkjet head 100 in the Y direction relative to the workpiece 200 supported on the worktable 18. Here, printing when the inkjet head 100 moves along a path Y1 from one side of the Y direction to the other is defined as forward printing. Printing when the inkjet head 100 moves along a return path Y2 from the other side of the Y direction to one side is defined as return printing. Figure 3 As shown, the control device 20 includes an acquisition unit 23, a data conversion unit 25, a forward printing control unit 31, and a reverse printing control unit 32. The acquisition unit 23 acquires image data DT1 (see reference). Figure 5 The image data DT1 indicates whether ink is being ejected toward the position of the printed object 200 corresponding to the path Y1 in the Y direction, and has multiple column image data DT2 prepared for each ejection column 102. For example... Figure 5As shown, the data conversion unit 25 generates converted image data DT3, which is used for recirculation printing, and has converted column image data DT4 obtained by reversing column image data DT2 based on image data DT1. In recirculation printing, the data conversion unit 25 sequentially starts referencing the converted column image data DT4 from the first jet column 102A (on the left side in this case), one of the multiple jet columns 102, in the Y direction, and adds empty data DT10 before the converted column image data DT4, causing the ink ejected from the multiple jet columns 102 to overlap, and sequentially starts ink ejection from the fourth jet column 102D (on the right side in this case). Figure 6 As shown, the outgoing path printing control unit 31, based on the image data DT1 acquired by the acquisition unit 23, sequentially starts referencing the column image data DT2 from the first jet column 102A on the other side (here, the left side) of the multiple jet columns 102 in the Y direction, and begins ink jetting, thereby performing outgoing path printing. Figure 7B As shown, the re-loop printing control unit 32, based on the conversion image data DT3 generated by the data conversion unit 25, sequentially starts referencing the conversion column image data DT4 from the first jet column 102A on the other side of the Y direction among the plurality of jet columns 102, and sequentially starts ink jetting from the fourth jet column 102D on one side of the Y direction (here, the right side), thereby performing re-loop printing. Thus, in re-loop printing, similarly to outgoing printing, the reference to the conversion column image data DT4 is sequentially started from the first jet column 102A on the other side of the Y direction, and the timing of ink jetting is controlled based on the conversion column image data DT4 in a manner that the ink jetted from the plurality of jet columns 102 overlaps. Therefore, ink can be jetted to the appropriate position in both outgoing and re-loop printing.

[0080] In this embodiment, such as Figure 6 As shown, when the jetting column 102 of the jetting head 100, moving along the destination Y1, passes the predetermined destination reference position P1 in the Y direction, the destination printing control unit 31 controls the jetting of ink from the jetting column 102 based on the column image data DT2 corresponding to the jetting column 102, thereby performing destination printing. Figure 7BAs shown, when the jetting column 102 of the jetting head 100, moving along the return path Y2, passes the predetermined return path reference position P3 in the Y direction, the return path printing control unit 32 controls the jetting of ink from the jetting column 102 based on the conversion column image data DT4 corresponding to the jetting column 102, thereby performing return path printing. Thus, in outgoing path printing, by synchronizing the timing of starting the control of ink jetting for each jetting column 102 with the timing when each jetting column 102 passes the outgoing path reference position P1, ink can be jetted to the appropriate position and overlapped. Similarly, in return path printing, by synchronizing the timing of starting the control of ink jetting for each jetting column 102 with the timing when each jetting column 102 passes the return path reference position P3, ink can be jetted to the appropriate position and overlapped.

[0081] In this embodiment, such as Figure 1 As shown, the printer 10 includes a outgoing reference mark 41 located on the right side of the Y-direction relative to the outgoing reference position P1, a return reference mark 42 located on the left side of the Y-direction relative to the return reference position P3, and a sensor 306. The sensor 306 is located on the print head 100 and detects the outgoing reference mark 41 and the return reference mark 42. Figure 3 As shown, the control device 20 includes a detection unit 27. The detection unit 27 detects the path detection position P2 (refer to...). Figure 6 ) or return path detection location P4 (refer to Figure 7A The outbound path detection position P2 is the Y-direction position of sensor 306 when it detects the outbound path reference mark 41, and the return path detection position P4 is the Y-direction position of sensor 306 when it detects the return path reference mark 42. Figure 6 As shown, when the ejector head 100 moves from the destination detection position P2 along the destination Y1 and each ejector column 102 passes the destination reference position P1, the destination printing control unit 31 performs control to eject ink from the ejector column 102 based on the column image data DT2 corresponding to the ejector column 102. Figure 7B As shown, when the ejector head 100 moves from the return path detection position P4 along the return path Y2 and each ejection column 102 passes the return path reference position P3, the return path printing control unit 32 controls the ejection of ink from the ejection column 102 based on the conversion column image data DT4 corresponding to the ejection column 102. Thus, by moving the ejector head 100 along the return path Y1 with the return path detection position P2 (where the return path reference mark 41 is detected) as a reference, it is easy to determine that the ejection column 102 has passed the return path reference position P1. Similarly, by moving the ejector head 100 along the return path Y2 with the return path detection position P4 (where the return path reference mark 42 is detected) as a reference, it is easy to determine that the ejection column 102 has passed the return path reference position P3.

[0082] In this embodiment, such asFigure 7A As shown, when the print head 100 moves from the return detection position P4 along the return path Y2 and the print train 102 passes the predetermined return reference position P5, the return printing control unit 32 begins to convert the reference of the column image data DT4. The data conversion unit 25 adds the empty data DT10 (reference) referenced during the period when the print train 102 moves from the return reference position P5 to the return reference position P3 to the converted column image data DT4. Figure 7A Therefore, during the period when the jet train 102 moves from the return reference position P5 to the return reference position P3, it is possible to stop jetting ink from the jet train 102.

[0083] In this embodiment, such as Figure 2 As shown, the injection column 102 has a first injection column 102A and a second injection column 102B disposed on the side (right side in this case) of the first injection column 102A in the Y direction. Figure 5 As shown, the conversion column image data DT4 has a first conversion column image data DT41 corresponding to the first injection column 102A and a second conversion column image data DT42 corresponding to the second injection column 102B. For example... Figure 6 As shown, the outgoing path printing control unit 31 is configured such that when the print head 100 moves a predetermined first moving distance D1 from the outgoing path detection position P2 along the outgoing path Y1, the first print head 102 reaches the outgoing path reference position P1, and when the print head 100 moves a second moving distance D2 from the outgoing path detection position P2 along the outgoing path Y1 that is longer than the first moving distance D1, the second print head 102B reaches the outgoing path reference position P1. Figure 7AAs shown, when the print head 100 moves a first travel distance D1 from the return path detection position P4 along the return path Y2, the return path printing control unit 32 causes the first print column 102A to pass through the first return path reference position P51, initiating the reference of the first conversion column image data DT41. Furthermore, when the print head 100 moves a second travel distance D2 from the return path detection position P4 along the return path Y2, the return path printing control unit 32 causes the second print column 102B to pass through the second return path reference position P52, initiating the reference of the second conversion column image data DT42. The data conversion unit 25 adds empty data DT10 referenced during the period when the first print column 102A moves from the first return path reference position P51 to the return path reference position P3 to the first conversion column image data DT41. Additionally, the data conversion unit 25 adds empty data DT10 referenced during the period when the second print column 102B moves from the second return path reference position P52 to the return path reference position P3 to the second conversion column image data DT42. In this way, the travel distance of the first jet column 102A until it reaches the travel reference position P1 in outgoing printing and the travel distance of the first jet column 102A until it reaches the first return reference position P51 in return printing can be set to the same first travel distance D1. Similarly, the travel distance of the second jet column 102B until it reaches the travel reference position P1 in outgoing printing and the travel distance of the second jet column 102B until it reaches the second return reference position P52 in return printing can be set to the same second travel distance D2. Therefore, the control up to the reference of the start column image data DT2 or the transition column image data DT4 can be generalized in both outgoing and return printing.

[0084] In this embodiment, such as Figure 2 As shown, the jet column 102 has a third jet column 102C positioned on the side (in this case, the right side) in the Y direction relative to the second jet column 102B. Figure 5 As shown, the conversion column image data DT4 has the third conversion column image data DT43 corresponding to the third jet column 102C. For example... Figure 6 As shown, the outgoing path printing control unit 31 is configured such that when the print head 100 moves a third moving distance D3, which is longer than the second moving distance D2, from the outgoing path detection position P2 along the outgoing path Y1, the third print head 102C reaches the outgoing path reference position P1. Figure 7A As shown, when the print head 100 moves a third travel distance D3 from the return detection position P4 along the return path Y2, the return path printing control unit 32 causes the third print column 102C to pass the third return path reference position P53, and begins referencing the third conversion column image data DT43. The data conversion unit 25 adds the empty data DT10 referenced during the period when the third print column 102C moves from the third return path reference position P53 to the return path reference position P3 to the third conversion column image data DT43. Here, as Figure 2As shown, the intervals between the first jet column 102A and the second jet column 102B, and the intervals between the second jet column 102B and the third jet column 102C, are the same reference interval β. Figure 6 As shown, the difference between the first moving distance D1 and the second moving distance D2, and the difference between the second moving distance D2 and the third moving distance D3, are the reference interval β. Therefore, in outgoing path printing, by moving the print head 100 along the outgoing path Y1 by the reference interval β each time, the first print column 102A, the second print column 102B, and the third print column 102C can sequentially reach the outgoing path reference position P1. In returning path printing, by moving the print head 100 along the returning path Y2 by the reference interval β each time, the third print column 102C, the second print column 102B, and the first print column 102A can sequentially reach the returning path reference position P3.

[0085] Furthermore, in this embodiment, a printing method for printer 10 is implemented. Here, the printing method includes an acquisition step, a data conversion step, a detection step, a forward printing control step, and a reverse printing control step. The acquisition step, data conversion step, detection step, forward printing control step, and reverse printing control step are respectively represented by the acquisition unit 23, the data conversion unit 25, the detection unit 27, the forward printing control unit 31, and the reverse printing control unit 32.

[0086] Label Explanation

[0087] 10 printers

[0088] 18 workbenches

[0089] 20 Control devices

[0090] 23 Acquisition Department

[0091] 25 Data Conversion Department

[0092] 27. Testing Department

[0093] 31. Outbound Printing Control Department

[0094] 32. Recirculation Printing Control Department

[0095] 41. Outbound reference mark

[0096] 42 Return route reference mark

[0097] 51-head moving mechanism

[0098] 100 spray heads

[0099] 101 Injection Port

[0100] 200 printed materials

[0101] 306 sensor

[0102] DT1 image data

[0103] DT2 column image data

[0104] DT3 converts image data

[0105] DT4 Transform Column Image Data

[0106] DT10 empty data

[0107] P1 Departure reference position

[0108] P2 outbound path detection location

[0109] P3 Return route reference position

[0110] P4 Return Path Detection Location

[0111] P5 Return route reference location

[0112] Y1 route

[0113] Y2 Return Route

Claims

1. A printer, comprising: The workbench supports the printed material; The print head has multiple print columns, which are print nozzles for ejecting ink arranged in a first direction and arranged in a second direction intersecting the first direction; A head moving mechanism that moves the printing head in the second direction relative to the workpiece supported on the worktable; as well as Control device, When the printing is defined as outgoing path printing when the nozzle moves along a path from one side of the second direction to the other, and when the printing is defined as returning path printing when the nozzle moves along a path from the other side of the second direction to the other side, The control device includes: The acquisition unit acquires image data indicating whether there is ink jetting toward the position of the printed object corresponding to the path of the second direction, and has multiple columns of image data prepared for each jetting column; as well as The data conversion unit generates converted image data, which is used for the reverse printing, and includes converted column image data obtained by reversing the column image data based on the image data. In the reflow printing process, the data conversion unit sequentially references the image data of the conversion columns from the other side of the second direction among the plurality of injection columns, and adds empty data before the conversion column image data, so that the ink ejected from the plurality of injection columns overlaps, and the ink ejection sequentially starts from the injection columns on one side of the second direction. The control device includes: The outgoing printing control unit, based on the image data acquired by the acquisition unit, sequentially starts referencing the column image data from the other side of the second direction of the plurality of jet columns, and starts ink jetting, thereby performing outgoing printing; as well as The recirculation printing control unit, based on the converted image data generated by the data conversion unit, sequentially starts referencing the converted column image data from the jetting column on the other side of the second direction among the plurality of jetting columns, and sequentially starts ink jetting from the jetting column on one side of the second direction, thereby performing the recirculation printing.

2. The printer according to claim 1, wherein, The path printing control unit controls the ejection of ink from the ejection column based on the column image data corresponding to the ejection column when the ejection column of the ejection head moving along the path passes a predetermined path reference position in the second direction, thereby performing path printing. The return printing control unit controls the ejection of ink from the ejection column based on the conversion column image data corresponding to the ejection column when the ejection column of the ejection head moving along the return path passes a predetermined return reference position in the second direction, thereby performing the return printing.

3. The printer according to claim 2, wherein, The printer has: The outbound reference mark is set at a position on the side closer to the second direction than the outbound reference position; The return route reference mark is set at a position on the opposite side of the second direction than the return route reference position; as well as A sensor, installed on the injection head, detects the outgoing reference mark and the returning reference mark. The control device includes a detection unit that detects either the outgoing path detection position or the returning path detection position. The outgoing path detection position is the position of the sensor in the second direction when the sensor detects the outgoing path reference mark, and the returning path detection position is the position of the sensor in the second direction when the sensor detects the returning path reference mark. The path printing control unit controls the ejection of ink from the ejection column based on the column image data corresponding to the ejection column when the ejector head moves along the path from the path detection position and when each of the ejection columns passes the path reference position. The return printing control unit controls the ejection of ink from the ejection column based on the conversion column image data corresponding to the ejection column when the ejector head moves along the return path from the return detection position and when each of the ejection columns passes the return reference position.

4. The printer according to claim 3, wherein, The return printing control unit begins referencing the conversion column image data when the print head moves along the return path from the return detection position and the print column passes a predetermined return reference position. The data conversion unit adds the converted column image data to the empty data referenced during the period when the jet column moves from the return reference position to the return reference position.

5. The printer according to claim 4, wherein, The jet train has: First jet train; and The second jet column is positioned on the side further in the second direction than the first jet column. The transformed column image data has: The first conversion column image data corresponds to the first injection column; and The second conversion column image data corresponds to the second spray column. The routing printing control unit is configured such that when the print head moves a predetermined first distance along the routing path from the routing detection position, the first print column reaches the routing reference position; and when the print head moves a second distance along the routing path from the routing detection position, the second print column reaches the routing reference position, wherein the second distance is longer than the first distance. The return printing control unit causes the first inkjet column to pass the first return reference position and begin referencing the image data of the first conversion column when the inkjet head has moved the first distance along the return path from the return detection position. The return printing control unit causes the second jetting column to pass the second return reference position and begin referencing the second conversion column image data when the jetting head has moved the second travel distance along the return path from the return detection position. The data conversion unit adds the null data referenced during the period when the first jet column moves from the first return reference position to the return reference position to the first conversion column image data, and adds the null data referenced during the period when the second jet column moves from the second return reference position to the return reference position to the second conversion column image data.

6. The printer according to claim 5, wherein, The jet column has a third jet column, which is positioned on the side closer to the second direction than the second jet column. The conversion column image data includes third conversion column image data corresponding to the third jet column. The path printing control unit is configured such that when the print head moves a third distance along the path from the path detection position, the third print column reaches the path reference position, and the third moving distance is longer than the second moving distance. The return-path printing control unit causes the third jetting column to pass the third return-path reference position and begin referencing the image data of the third conversion column when the jetting head has moved the third travel distance from the return-path detection position along the return path. The data conversion unit adds the empty data referenced during the period when the third jet column moves from the third return reference position to the return reference position to the third conversion column image data. The interval between the first jet column and the second jet column, and the interval between the second jet column and the third jet column, are the same reference interval. The difference between the first moving distance and the second moving distance, and the difference between the second moving distance and the third moving distance, are respectively the reference intervals.

7. A printing method, specifically a printing method using a printer, wherein, The printer has: The workbench supports the printed material; as well as The printhead has multiple print columns, which are ink ejection nozzles arranged in a first direction and configured in a second direction intersecting the first direction. When the printing is defined as outgoing path printing when the nozzle moves along a path from one side of the second direction to the other, and when the printing is defined as returning path printing when the nozzle moves along a path from the other side of the second direction to the other side, The printing method includes the following steps: The acquisition step involves acquiring image data indicating whether there is ink ejection relative to the position of the printed object corresponding to the path of the second direction, and having multiple columns of image data prepared for each ejection column; as well as The data conversion step generates converted image data, which is used for the reverse printing, and includes converted column image data obtained by reversing the column image data based on the image data. In the data conversion step, during the reflow printing, the reference to the conversion column image data is sequentially started from the jetting column on the other side of the second direction among the plurality of jetting columns, and empty data is added before the conversion column image data, such that the ink jetted from the plurality of jetting columns overlaps, and the ink jetting is sequentially started from the jetting column on one side of the second direction. The printing method further includes the following steps: The outgoing printing control step, based on the image data obtained in the acquisition step, sequentially starts referencing the column image data from the other side of the second direction of the plurality of jet columns, and starts ink jetting, thereby performing the outgoing printing; as well as The re-printing control step, based on the converted image data generated in the data conversion step, sequentially starts referencing the converted column image data from the jetting column on the other side of the second direction among the plurality of jetting columns, and sequentially starts ink jetting from the jetting column on the other side of the second direction, thereby performing the re-printing.

Images