JP7328271B2 - inkjet printer - Google Patents

Description

The present invention relates to inkjet printers.

2. Description of the Related Art Ink jet printers (hereinafter sometimes simply referred to as "photocurable printers") using photocurable inks (hereinafter sometimes simply referred to as "photocurable inks") have been known. ing. In a photocurable printer, photocurable ink is ejected from an ink head, and the ejected photocurable ink is irradiated with light (for example, ultraviolet rays) from a light irradiation device. As a result, the photocurable ink is quickly cured on the recording medium to form an ink layer, and a desired image can be printed.

2. Description of the Related Art In a photocurable printer, printing is sometimes performed on a non-ink-absorbing recording medium made of, for example, a resin material or a metal material. In such a case, for example, before the ink for image formation is ejected onto the recording medium, the ink for foundation may be ejected onto the recording medium to form a foundation layer. For example, in Patent Document 1, a primer layer is formed by ejecting adhesive primer ink onto the surface of a non-ink-absorbing recording medium, and printing is performed by ejecting ink for image formation onto the primer layer. is disclosed.

Examples of image forming inks include process color inks such as cyan ink, magenta ink, yellow ink and black ink, and white ink. For example, white ink is used as a base layer when printing on a recording medium. By ejecting the process color ink on the white ink, the color development of the process color ink is enhanced.

Japanese Patent No. 2020-23080

By the way, for example, when a primer layer, a base layer made of white ink, and a print layer made of process color ink are printed in this order on a recording medium, usually the primer layer is first formed by ejecting the primer ink over the entire recording medium. . After that, the recording medium is pulled back to eject white ink to form a base layer, and then the recording medium is pulled back again to eject process color inks to form a print layer. In some cases, the ink is ejected simultaneously to form the base layer and the print layer. When the print layer is formed by pulling back the recording medium after the base layer is formed, the recording medium may be displaced during the pulling back. For this reason, there is a possibility that the base layer and the print layer may be misaligned, resulting in deterioration in quality. Therefore, in order to solve such a problem, the underlayer and the print layer are formed at the same time. Only half of the nozzles in each nozzle row can be used, which can cause problems such as a decrease in printing speed and the occurrence of unused nozzles.

In addition, since the recording medium needs to be pulled back after the primer layer is formed, if the primer layer can be formed quickly, the time required for the entire printing can be shortened.

The present invention has been made in view of such a point, and an object of the present invention is to suppress misalignment between the ink used for image formation and the white ink without causing unused nozzles, and to provide an underlayer before image formation. It is an object of the present invention to provide an ink jet printer capable of quickly forming an ink layer formed by ink used for surface finishing after formation or image formation.

An inkjet printer according to the present invention includes a mounting table on which a recording medium is mounted, and a plurality of first inks for ejecting a first ink used for base formation before image formation or surface finishing after image formation toward the recording medium. A first ink head having a first nozzle row in which one nozzle is arranged in a first direction, and an ink head arranged in a second direction crossing the first direction with respect to the first ink head, A plurality of second nozzles for ejecting the first ink toward the recording medium are arranged in the first direction, and some of the second nozzles are provided in parallel with the first nozzle row in the second direction. a second ink head having a second nozzle row and a plurality of third nozzles for ejecting a second ink used for image formation toward the recording medium are arranged in the first direction and in the first nozzle row; On the other hand, a third nozzle row provided in parallel in the second direction, and a plurality of fourth nozzles for ejecting white ink toward the recording medium are arranged in the first direction and the second nozzle row. a fourth nozzle row provided in parallel in the second direction with respect to, and the first ink head, the second ink head, the third nozzle row provided movably in the second direction, and a carriage including the fourth nozzle row; and a moving device capable of moving one of the mounting table and the carriage relative to the other in the first direction.

According to the inkjet printer of the present invention, the first nozzle array composed of the first nozzles that eject the first ink and the second nozzle array composed of the second nozzles that eject the first ink are arranged in the first nozzle array. It is displaced (displaced) with respect to the direction. Therefore, when the carriage reciprocates in the second direction, the first ink can be ejected toward the recording medium from the first nozzles of the first nozzle row and the second nozzles of the second nozzle row. , the first ink can be ejected over a wider area of the recording medium in the first direction when the carriage reciprocates once in the second direction. That is, by curing the first ink, the first ink layer can be formed over a wider area of the recording medium. As a result, the recording medium can be moved faster in the first direction, so the first ink can be ejected over the entire recording medium more quickly. Further, a third nozzle array composed of third nozzles for ejecting the second ink is provided in parallel with the first nozzle array in the second direction, and a third nozzle array composed of fourth nozzles for ejecting white ink is provided in parallel with the first nozzle array. The four nozzle rows are arranged in parallel in the second direction with respect to the second nozzle row. That is, the third nozzle row and the fourth nozzle row are displaced with respect to the first direction. Therefore, when the carriage reciprocates in the second direction, all the third nozzles of the third nozzle row eject the second ink toward the recording medium, and all the fourth nozzles of the fourth nozzle row eject the second ink toward the recording medium. Since the white ink can be ejected from the nozzles onto the recording medium at the same time, the second ink and the white ink can be ejected over a wider area of the recording medium in the first direction. Furthermore, since the recording medium does not have to be pulled back after the white ink is ejected, it is possible to suppress the landing position deviation between the second ink and the white ink.

According to the present invention, the ink used for base formation before image formation or surface finishing after image formation while suppressing misalignment between the ink used for image formation and the white ink without causing unused nozzles. It is possible to provide an inkjet printer capable of forming an ink layer formed by the method more quickly.

1 is a perspective view of a printer according to one embodiment; FIG. 1 is a front view of a printer with a front cover opened according to one embodiment; FIG. 1 is a plan view of a printer with a front cover and a case removed according to one embodiment; FIG. 4 is a schematic diagram showing the configuration of the surface of the carriage on the side facing the recording medium according to one embodiment; FIG. 1 is a block diagram of a printer according to one embodiment; FIG. 4 is a flow chart showing the procedure when forming the first ink layer first. It is an example of a printed product. 4 is a flow chart showing a procedure for forming a first ink layer later; It is an example of a printed product.

Hereinafter, an inkjet printer (hereinafter referred to as "printer") according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiments described herein are, of course, not intended to specifically limit the present invention. Further, members and portions having the same function are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted or simplified.

FIG. 1 is a perspective view of a printer 10 according to this embodiment. The printer 10 prints on the recording medium 5 (see FIG. 2). In the following description, when the printer 10 is viewed from the front, the direction away from the printer 10 is defined as the front, and the direction closer to the printer 10 is defined as the rear. Left, right, top, and bottom mean left, right, top, and bottom, respectively, when the printer 10 is viewed from the front. References F, Rr, L, R, U, and D in the drawings mean front, rear, left, right, up, and down, respectively. Reference Y in the drawings indicates the main scanning direction. Here, the main scanning direction Y is the horizontal direction. Symbol X indicates the sub-scanning direction. Here, the sub-scanning direction X is the front-rear direction, and is orthogonal to the main scanning direction Y in plan view. Symbol Z indicates the vertical direction. The vertical direction Z is perpendicular to the main scanning direction Y when viewed from the front. The sub-scanning direction X is an example of a first direction. The main scanning direction Y is an example of a second direction. The forward direction Y1 indicates the direction from right to left in the main scanning direction Y, the return direction Y2 indicates the direction from left to right in the main scanning direction Y, and the forward direction X1 indicates the direction X in the sub-scanning direction. , and the return direction X2 indicates the direction from the downstream side to the upstream side in the sub-scanning direction X (here, the direction from front to back). . However, the above directions are merely directions for convenience of explanation, and do not limit the installation mode of the printer 10 in any way, and do not limit the present invention in any way.

The recording medium 5 used in this embodiment may be, for example, a flat sheet such as recording paper or transfer paper, various cases such as mobile phone cases, small electronic devices, parts such as key holders, photo frames, and pens. Three-dimensional objects such as small articles, daily necessities, and accessories may also be used. Materials for forming the recording medium 5 include paper such as plain paper and inkjet printing paper, as well as polyvinyl chloride (PVC), acrylic resin, polycarbonate, polystyrene, polyethylene, polyester, polyethylene terephthalate (PET), Resins such as acrylonitrile-butadiene-styrene (ABS) copolymers, metals such as aluminum and stainless steel, carbon, pottery, ceramics, glass, rubber, leather, and wood may also be used.

As shown in FIG. 1, the printer 10 has a box-shaped housing 12 . An internal space 12S is formed in the housing 12 . Housing 12 includes case 15 , front cover 23 , and operation panel 25 . An opening 28 (see FIG. 2) is formed in the front portion of the case 15 . The front cover 23 is provided so as to open and close the opening 28 of the case 15 . Here, the front cover 23 is supported by the case 15 so as to be rotatable about its rear end. By rotating the front cover 23 upward, the internal space 12S and the external space of the housing 12 are communicated. The internal space 12S is a space in which printing is performed on the recording medium 5 by an ink head 50 (see FIG. 2), which will be described later. Since the internal space 12S in which printing is performed is thus surrounded by the case 15 and the front cover 23, it is difficult for dust and dirt from the external space to enter the internal space 12S during printing. The light emitted from the ultraviolet irradiation device 40 (see FIG. 2) is less likely to leak to the external space.

As shown in FIG. 1, windows 23A are provided in the front and upper portions of the front cover 23 . The window 23A is made of, for example, a transparent acrylic plate. The window 23A is treated so that light (for example, ultraviolet rays) in the external space does not reach the internal space 12S. The user can visually recognize the inside of the housing 12 through the window 23A.

The operation panel 25 is provided on the case 15 . The operation panel 25 is provided on the upper right side of the case 15 . The operation panel 25 is a panel for the user to perform operations related to image printing. The operation panel 25 has a display screen 25A that displays information about printing such as the type of printing such as presence or absence of glossiness, resolution, and printing status, and input buttons for setting information about printing and the recording medium 5. 25B etc. are provided.

Next, the internal configuration of the printer 10 will be described. As shown in FIG. 2, the printer 10 includes a guide rail 18, a carriage 20, an ink head 50, an ultraviolet irradiation device 40, and a control device . The guide rail 18, the carriage 20, the ink head 50, and the ultraviolet irradiation device 40 are provided in the internal space 12S. The guide rail 18 is arranged inside the case 15 . As shown in FIG. 3, the guide rail 18 is fixed to the support wall 15A of the case 15 and extends in the main scanning direction Y. As shown in FIG. A carriage 20 is slidably mounted on the guide rail 18 . The carriage 20 is reciprocated in the main scanning direction Y along the guide rail 18 by a carriage movement mechanism 21 (see FIG. 5). The carriage moving mechanism 21 is controlled by the control device 70 . As the carriage 20 moves in the main scanning direction Y, the ink head 50 and the ultraviolet irradiation device 40 mounted on the carriage 20 move in the main scanning direction Y as well.

As shown in FIG. 2, the carriage 20 has a plurality of ink heads 50 mounted thereon. The ink head 50 is arranged above a table 35 which will be described later. The ink head 50 ejects photocurable ink (photocurable ink) onto the recording medium 5 placed on the table 35 . Each ink head 50 communicates with the ink cartridge 30 housed in the case 15 via a flexible ink tube (not shown). Photocurable ink is stored in each of the ink cartridges 30 .

As shown in FIG. 4, the ink heads 50 include a first ink head 51 and a second ink head 52 for ejecting a first ink used for base formation before image formation or for surface finishing after image formation, and a first ink head 51 and a second ink head 52 for image formation. It includes a third ink head 53 that ejects the second ink used and a fourth ink head 54 that ejects the white ink. The first ink head 51 , the second ink head 52 , the third ink head 53 and the fourth ink head 54 are mounted on the carriage 20 . That is, the carriage 20 includes a first left nozzle row 51L and a first right nozzle row 51R of the first ink head 51, a second left nozzle row 52L and a second right nozzle row 52R of the second ink head 52, and a third nozzle row 52R. A left third nozzle row 53L and a right third nozzle row 53R of the ink head 53, and a left fourth nozzle row 54L and a right fourth nozzle row 54R of the fourth ink head 54 are included. The first ink head 51, the second ink head 52, the third ink head, and the fourth ink head 54 are arranged side by side in the main scanning direction Y. As shown in FIG. The first ink head 51 is adjacent to the second ink head 52 . The second ink head 52 is arranged to the right of the first ink head 51 . The first ink head 51 and the second ink head 52 are arranged at positions shifted from each other with respect to the sub-scanning direction X. As shown in FIG. The first ink head 51 is arranged downstream (here, forward) in the sub-scanning direction X from the second ink head 52 . The first ink head 51 and the third ink head 53 are arranged at aligned positions in the sub-scanning direction X. As shown in FIG. Here, the third ink head 53 is arranged to the left of the first ink head 51 . The second ink head 52 and the fourth ink head 54 are arranged at aligned positions in the sub-scanning direction X. As shown in FIG. Here, the fourth ink head 54 is arranged to the right of the second ink head 52 . The first to fourth ink heads 51 to 54 are arranged in a so-called staggered arrangement. The first to fourth ink heads 51 to 54 are formed in such a shape that the length in the sub-scanning direction X is longer than the length in the main scanning direction Y. As shown in FIG. The first to fourth ink heads 51 to 54 are formed in the same shape and size. Although five ink heads 50 are provided in this embodiment, the number of ink heads 50 is not limited to five. Also, although the ink head 50 has two nozzle rows, the number of nozzle rows may be one or three or more.

As shown in FIG. 4, the first ink head 51 includes a plurality of left first nozzles 51A aligned in the sub-scanning direction X and a plurality of right nozzles aligned in the sub-scanning direction X and positioned to the right of the left first nozzles 51A. It has a first nozzle 51B and a first nozzle surface 51C on which left first nozzles 51A and right first nozzles 51B are formed. A plurality of left first nozzles 51A are aligned in one row to form a left first nozzle row 51L. A plurality of right first nozzles 51B are arranged in a line to form a right first nozzle row 51R. The left first nozzle 51A and the right first nozzle 51B eject the first ink toward the recording medium 5 . The left first nozzle 51A and the right first nozzle 51B are examples of first nozzles. The left first nozzle row 51L and the right first nozzle row 51R are examples of first nozzle rows. The second ink head 52 includes a plurality of left-side second nozzles 52A aligned in the sub-scanning direction X, a plurality of right-side second nozzles 52B aligned in the sub-scanning direction X and positioned to the right of the left-side second nozzles 52A, and a left-side nozzle 52B. It has a second nozzle surface 52C on which the second nozzles 52A and the right second nozzles 52B are formed. A plurality of left second nozzles 52A are arranged in one row to form a left second nozzle row 52L. A plurality of right second nozzles 52B are arranged in a line to form a right second nozzle row 52R. The left second nozzle 52A and the right second nozzle 52B eject the first ink toward the recording medium 5 . The left second nozzle 52A and the right second nozzle 52B are examples of second nozzles. The left second nozzle row 52L and the right second nozzle row 52R are examples of second nozzle rows. Parts of the left second nozzle row 52L and the right second nozzle row 52R are provided in parallel in the main scanning direction Y with respect to the left first nozzle row 51L and the right first nozzle row 51R. That is, a part of the left second nozzle row 52L and a part of the right second nozzle row 52R and a part of the left first nozzle row 51L and a part of the right first nozzle row 51R are aligned with respect to the sub-scanning direction X in the area SA of FIG. are placed in the same position. In this embodiment, the number of left first nozzles 51A in the left first nozzle row 51L, the number of right first nozzles 51B in the right first nozzle row 51R, and the number of left second nozzles 52A in the left second nozzle row 52L are and the number of right second nozzles 52B of the right second nozzle row 52R are equal to each other. The interval (pitch between adjacent nozzles) between the left first nozzles 51A of the left first nozzle row 51L, the interval between the right first nozzles 51B of the right first nozzle row 51R, and the left nozzle row of the left second nozzle row 52L. The interval between the two nozzles 52A is equal to the interval between the right second nozzles 52B of the right second nozzle row 52R.

As shown in FIG. 4, the printer 10 has two third ink heads 53 . The third ink head 53 includes a plurality of left-side third nozzles 53A aligned in the sub-scanning direction X, a plurality of right-side third nozzles 53B aligned in the sub-scanning direction X and positioned to the right of the left-side third nozzles 53A, and a left-side nozzle 53B. It has a third nozzle surface 53C on which the third nozzles 53A and the right third nozzles 53B are formed. A plurality of left third nozzles 53A are arranged in one row to form a left third nozzle row 53L. A plurality of right third nozzles 53B are arranged in a line to form a right third nozzle row 53R. The left third nozzle 53A and right third nozzle 53B eject the second ink toward the recording medium 5 . The left third nozzle 53A and the right third nozzle 53B are examples of third nozzles. The left third nozzle row 53L and the right third nozzle row 53R are examples of the third nozzle row. The fourth ink head 54 includes a plurality of left fourth nozzles 54A aligned in the sub-scanning direction X, a plurality of right fourth nozzles 54B aligned in the sub-scanning direction X and positioned to the right of the left fourth nozzles 54A, and a left and a fourth nozzle surface 54C on which fourth nozzles 54A and right fourth nozzles 54B are formed. A plurality of left fourth nozzles 54A are arranged in a row to form a left fourth nozzle row 54L. A plurality of right fourth nozzles 54B are arranged in a row to form a right fourth nozzle row 54R. The fourth left nozzle 54 A and the fourth right nozzle 54 B eject white ink toward the recording medium 5 . The fourth left nozzle 54A and the fourth right nozzle 54B are examples of fourth nozzles. The left fourth nozzle row 54L and the right fourth nozzle row 54R are examples of the fourth nozzle row. Incidentally, in FIG. 4, each nozzle of the first ink head 51 to the fourth ink head 54 is represented by a straight line.

The first ink is an ink used for base formation before image formation or for surface finishing after image formation. The first ink is photocurable. That is, the first ink is a photo-curing ink having a property of curing when irradiated with light (for example, ultraviolet rays). A first ink layer is formed by curing the first ink. The ink used for base formation before image formation is, for example, primer ink. Primer ink is tacky. The ink used for surface finishing after image formation is, for example, gloss ink. In this embodiment, the primer ink is ejected from the first left nozzle 51A and the first right nozzle 51B of the first ink head 51, and the second left nozzle 52A and the second right nozzle 52B of the second ink head 52. Ink may be ejected. Further, for example, one of the primer ink and the gloss ink is ejected from the left first nozzle 51A and the right second nozzle 52B, and either the primer ink or the gloss ink is ejected from the right first nozzle 51B and the left second nozzle 52A. or the other may be ejected.

The second ink is ink used for image formation. The second ink is photocurable. That is, the second ink is a photo-curing ink having a property of curing when irradiated with light (for example, ultraviolet rays). A second ink layer (ie, print layer) is formed by curing the second ink. The second ink is, for example, process color ink. Examples of process color inks include cyan ink, magenta ink, yellow ink, black ink, light cyan ink, and light magenta ink. In this embodiment, the third left nozzle 53A and the third right nozzle 53B of the third ink head 53 on the left side, the third left nozzle 53A and the third right nozzle 53B of the third ink head 53 on the right side respectively emit cyan ink. Ink, magenta ink, yellow ink, and black ink are ejected, but the type of ink to be ejected is not limited to these.

White ink is ink used for base formation before image formation. White ink has photocurability. That is, the white ink is a photo-curing ink having a property of curing when irradiated with light (for example, ultraviolet rays). A white underlayer is formed by curing the white ink.

As shown in FIG. 2, the printer 10 has one ultraviolet irradiation device 40 . The ultraviolet irradiation device 40 irradiates light (typically ultraviolet rays). The ultraviolet irradiation device 40 is configured to be able to irradiate the first ink, the second ink, and the white ink ejected onto the recording medium 5 with light (here, ultraviolet rays). The ultraviolet irradiation device 40 includes a plurality of light sources 43 arranged in the sub-scanning direction X. As shown in FIG. In the ultraviolet irradiation device 40 , a plurality of light sources 43 are arranged in a row to form a light source row 44 . A part of the light source 43 is positioned behind the first ink head 51 (that is, upstream in the sub-scanning direction X), and the other part of the light source 43 is positioned ahead of the second ink head 52 (that is, a sub-scanning direction). downstream in direction X). The light source 43 irradiates the first ink, the second ink, and the white ink ejected onto the recording medium 5 with light (here, ultraviolet rays). In addition, in FIG. 4, the light source 43 is represented by a straight line. The light source 43 is, for example, an LED. The ultraviolet irradiation device 40 is an example of a light irradiation device. As shown in FIG. 2 , the ultraviolet irradiation device 40 is mounted on the carriage 20 . The ultraviolet irradiation device 40 is arranged above a table 35 which will be described later. As shown in FIG. 4, the ultraviolet irradiation device 40 is arranged on the return direction Y2 side (here, on the right side) of the ink head 50 .

As shown in FIG. 2, the printer 10 is a so-called flatbed printer. The printer 10 includes a table 35 arranged below the carriage 20 , a first table moving mechanism 36 and a second table moving mechanism 37 . The table 35, the first table moving mechanism 36 and the second table moving mechanism 37 are provided in the internal space 12S. The table 35 is an example of a mounting table. A recording medium 5 is placed on the table 35 . A table 35 is a platform for supporting the recording medium 5 . The table 35 is configured to be movable in the sub-scanning direction X by a first table moving mechanism 36 . The table 35 is configured to be movable in the vertical direction Z by a second table moving mechanism 37 .

As shown in FIG. 2, the first table moving mechanism 36 includes slide rails 36a and 36b, a conveying member 36c, and a first motor 39A (see FIG. 5). The slide rails 36a and 36b extend in the sub-scanning direction X. As shown in FIG. The conveying member 36c is provided slidably with respect to the slide rails 36a and 36b. A table 35 is supported above the conveying member 36c via other members. The first motor 39A is electrically connected to the control device 70 and controlled by the control device 70 . When the first motor 39A is driven, the conveying member 36c moves along the slide rails 36a and 36b. As a result, the table 35 moves in the sub-scanning direction X. As shown in FIG. The first table moving mechanism 36 is an example of a moving device.

As shown in FIG. 2, the second table moving mechanism 37 includes a height adjusting member 37a and a second motor 39B (see FIG. 5). The height adjustment member 37a is provided on the lower surface of the table 35. As shown in FIG. The height adjustment member 37a is connected to the second motor 39B. The second motor 39B is electrically connected to the control device 70 and controlled by the control device 70 . When the second motor 39B is driven, the height of the height adjusting member 37a is changed, and the height of the table 35 is adjusted. That is, the table 35 moves in the up-down direction Z. As shown in FIG.

As shown in FIG. 5 , the control device 70 is a device that controls printing on the recording medium 5 . The configuration of the control device 70 is not particularly limited. The control device 70 is, for example, a microcomputer. The hardware configuration of the microcomputer is not particularly limited. central processing unit), ROM (read only memory) that stores programs executed by the CPU, RAM (random access memory) that is used as a working area for developing programs, and memory that stores programs and various data a storage device; As shown in FIG. 2, the control device 70 is provided inside the case 15 . However, the control device 70 may not be provided inside the case 15 . For example, the control device 70 may be a computer or the like installed outside the case 15 . In this case, the control device 70 is communicably connected to the printer 10 via wire or wireless.

As shown in FIG. 5, the control device 70 includes an operation panel 25, a carriage moving mechanism 21, a first ink head 51, a second ink head 52, a third ink head 53, and a fourth ink head 54. , the ultraviolet irradiation device 40, the first motor 39A of the first table moving mechanism 36 (see FIG. 2), and the second motor 39B of the second table moving mechanism 37 (see FIG. 2) are communicably connected. The control device 70 controls the carriage moving mechanism 21, the first ink head 51, the second ink head 52, the third ink head 53, the fourth ink head 54, the ultraviolet irradiation device 40, the first motor 39A and the second motor 39B. do.

The control device 70 controls the amount of ink ejected from each nozzle of the first ink head 51 to the fourth ink head 54, the ejection timing, and the like. The control device 70 controls the amount of ultraviolet light emitted from the light source 43 of the ultraviolet irradiation device 40, the irradiation timing, and the like. The control device 70 controls movement of the carriage 20 in the main scanning direction Y. As shown in FIG. The control device 70 controls movement of the table 35 in the sub-scanning direction X. FIG.

As shown in FIG. 5 , the control device 70 includes a first ink layer pre-forming section 72 , a first ink layer post-forming section 74 , and a movement control section 76 . The function of each part of the control device 70 is implemented by a program. This program is read from a recording medium such as a CD or DVD. Note that this program may be downloaded through the Internet. Also, the function of each unit of the control device 70 may be realized by a processor and/or a circuit or the like. The specific functions of these units will be described later.

The first ink layer pre-forming section 72 is a section for forming the first ink layer 82 (see FIG. 7), the white base layer 84 (see FIG. 7) and the second ink layer 86 (see FIG. 7) on the recording medium 5. be. The first ink layer pre-forming unit 72 first forms the first ink layer 82, and then forms the white base layer 84 and the second ink layer 86 in this order. , and then the second ink layer 86 and the white base layer 84 are formed in this order. When the first ink layer 82 is formed first, a primer ink is usually used as the first ink. The first ink layer first forming section 72 controls the carriage moving mechanism 21 , the first ink head 51 to the fourth ink head 54 and the light source 43 of the ultraviolet irradiation device 40 . The first ink layer former forming section 72 controls the amount of light from the light source 43, the timing of lighting, and the like.

In the first ejection control, the first ink layer first forming part 72 is configured to operate the first left nozzle 51A and the first right nozzle 51B of the first ink head 51, the second left nozzle 52A and the second right nozzle of the second ink head 52, respectively. After the first ink is ejected from 52B onto the recording medium 5, the first ink is irradiated with light from the light source 43 of the ultraviolet irradiation device 40 to form the first ink layer . After the white ink is ejected from the fourth left nozzle 54A and the fourth right nozzle 54B of the fourth ink head 54 onto the first ink layer 82, the first ink layer first forming unit 72 irradiates the ejected white ink with ultraviolet rays. Light is emitted from the light source 43 of the device 40 to form a white underlayer 84 on the first ink layer 82 . After the second ink is ejected from the left third nozzle 53A and the right third nozzle 53B of the third ink head 53 onto the white base layer 84, the first ink layer pre-forming unit 72 applies ultraviolet rays to the ejected second ink. Light is emitted from the light source 43 of the irradiation device 40 to form the second ink layer 86 on the white base layer 84 to obtain the printed product 80A.

In the second ejection control, the first ink layer first forming part 72 controls the first left nozzle 51A and the first right nozzle 51B of the first ink head 51, the second left nozzle 52A and the second right nozzle of the second ink head 52. After the first ink is ejected from 52B onto the recording medium 5, the first ink is irradiated with light from the light source 43 of the ultraviolet irradiation device 40 to form the first ink layer . After the second ink is ejected onto the first ink layer 82 from the left third nozzles 53A and the right third nozzles 53B of the third ink head 53, the first ink layer pre-forming unit 72 causes the ejected second ink to A second ink layer 86 is formed on the first ink layer 82 by irradiating light from the light source 43 of the ultraviolet irradiation device 40 . After the white ink is ejected from the fourth left nozzle 54A and the fourth right nozzle 54B of the fourth ink head 54 to the second ink layer 86, the first ink layer first forming unit 72 irradiates the ejected white ink with ultraviolet rays. Light is emitted from the light source 43 of the device 40 to form the white base layer 84 on the second ink layer 86 to obtain the printed product 80A. In the second ejection control, a transparent recording medium 5 made of acrylic resin, for example, is used.

The first ink layer post-forming portion 74 is a portion where a white base layer, a second ink layer and a first ink layer are formed on the recording medium 5 in this order. The first ink layer post-forming section 74 controls the carriage moving mechanism 21 , the first ink head 51 to the fourth ink head 54 and the light source 43 of the ultraviolet irradiation device 40 . The first ink layer post-forming unit 74 controls the amount of light from the light source 43, the timing of lighting, and the like. After the first ink layer post-forming unit 74 ejects white ink from the fourth left nozzle 54A and the fourth right nozzle 54B of the fourth ink head 54 toward the recording medium 5 (for example, onto the recording medium 5), The discharged white ink is irradiated with light from the light source 43 of the ultraviolet irradiation device 40 to form the white base layer 84 (see FIG. 9). In the example shown in FIG. 9 , a white underlayer 84 is formed on the recording medium 5 . The first ink layer post-forming unit 74 ejects the second ink from the left third nozzles 53A and the right third nozzles 53B of the third ink head 53 onto the white base layer 84, and then applies ultraviolet light to the ejected second ink. Light is emitted from the light source 43 of the irradiation device 40 to form the second ink layer 86 (see FIG. 9) on the white base layer 84 . The first ink layer post-forming section 74 supplies the first ink from the left first nozzle 51A and the right first nozzle 51B of the first ink head 51 and the left second nozzle 52A and the right second nozzle 52B of the second ink head 52. After being discharged onto the second ink layer 86, the first ink is irradiated with light from the light source 43 of the ultraviolet irradiation device 40 to form the first ink layer 82 (see FIG. 9) on the second ink layer 86. A printed product 80B is obtained. The first ink layer post-forming section 74 first forms the white base layer 84 and the second ink layer 86 , and then forms the first ink layer 82 . When the first ink layer 82 is formed later, gloss ink is usually used as the first ink.

The first ink layer pre-forming section 72 and the first ink layer post-forming section 74 have a first resolution when forming the first ink layer 82 and a first resolution when forming the white base layer 84 and the second ink layer 86 . The two resolutions may be different. For example, the first resolution is lower than the second resolution. In addition, the first ink layer pre-forming section 72 and the first ink layer post-forming section 74 have the first pass number (pass number in the sub-scanning direction X) when forming the first ink layer 82 and the white base layer 84 and the second number of passes (the number of passes in the sub-scanning direction X) when forming the second ink layer 86 may be different. For example, the number of first passes is less than the number of second passes.

The movement control unit 76 is a part that moves the recording medium 5 in the sub-scanning direction X (that is, the forward direction X1 and the return direction X2). The movement control section 76 controls the first motor 39A of the first table movement mechanism 36 . After the carriage 20 makes one reciprocation in the forward direction Y1 and the return direction Y2, the movement control unit 76 controls the first motor 39A to move the table 35 in the sub-scanning direction X by a distance corresponding to one pass. As a result, the recording medium 5 moves in the sub-scanning direction X by a distance corresponding to one pass. When the first ink layer 82 is formed first, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 when forming the first ink layer 82 (see FIG. 7). After the recording medium 5 is moved in the forward direction X1 (corresponding to the first movement), and after the first ink layer 82 is formed, the recording medium 5 is moved in the return direction X2 (that is, the recording medium 5 is pulled back), and When forming the base layer 84 and the second ink layer 86, the recording medium 5 is moved in the going direction X1 (corresponding to the second movement). Here, the movement control section 76 pulls back the recording medium 5 after the first ink layer 82 is formed. Further, when the first ink layer 82 is formed later, the movement control section 76 controls the first table movement mechanism 36 to cause the white base layer 84 (see FIG. 9) and the second ink layer 86 (see FIG. 9) to be formed. 9) is formed, the recording medium 5 is moved in the forward direction X1, and after the white base layer 84 and the second ink layer 86 are formed, the recording medium 5 is moved in the return direction X2 (that is, the recording medium 5 ) and forming the first ink layer 82 (see FIG. 9) on the second ink layer 86, the recording medium 5 is moved in the forward direction X1. Here, the movement control section 76 pulls back the recording medium 5 before the first ink layer 82 is formed.

FIG. 6 is a flow chart showing the procedure when forming the first ink layer first. Here, the first ink layer first forming section 72 executes the first ejection control, and in the first ejection control, for example, the primer ink is used as the first ink.

First, in step S<b>10 , the first ink layer 82 (see FIG. 7 ) is formed on the recording medium 5 by the first ink layer former forming section 72 . Then, in step S20, the movement control section 76 pulls back the recording medium 5. FIG. Thereafter, in step S30, the first ink layer former forming unit 72 forms a white base layer 84 (see FIG. 7) on the first ink layer 82, and a second ink layer 86 (see FIG. 7) is formed on the white base layer 84. ) is formed. Here, since the third ink head 53 and the fourth ink head 54 are in a so-called staggered arrangement, when the carriage 20 reciprocates in the main scanning direction Y, the left fourth nozzle 54A of the fourth ink head 54 and the fourth nozzle 54A of the fourth ink head 54 and White ink is ejected from the right fourth nozzle 54B toward the recording medium 5, and second ink is ejected toward the white base layer 84 from the left third nozzle 53A and the right third nozzle 53B of the third ink head 53. be done. That is, when the carriage 20 makes one reciprocating motion in the main scanning direction Y, the white underlayer 84 is formed on the upstream side of the recording medium 5, and at the same time, the second ink layer is formed on the downstream side of the recording medium 5. 86 is formed.

FIG. 8 is a flow chart showing the procedure when forming the first ink layer later. In FIG. 8, for example, gloss ink is used as the first ink.

First, in step S110, the first ink layer post-forming section 74 forms the white underlayer 84 (see FIG. 9) on the recording medium 5, and the second ink layer 86 (see FIG. 9) is formed on the white underlayer 84. It is formed. Then, in step S120, the movement control section 76 pulls back the recording medium 5. FIG. Thereafter, in step S130, the first ink layer 82 (see FIG. 9) is formed on the second ink layer 86 by the first ink layer post-forming section 74. As shown in FIG.

As described above, according to the printer 10 of the present embodiment, the left first nozzle row 51L is composed of the left first nozzles 51A that eject the first ink, and the left second nozzles 52A are composed of the left second nozzles 52A that eject the first ink. The second nozzle row 52L on the left side is shifted in the sub-scanning direction X from the left second nozzle row 52L. Therefore, when the carriage 20 reciprocates in the main scanning direction Y, the left first nozzles 51A of the left first nozzle row 51L and the left second nozzles 52A of the left second nozzle row 52L are directed toward the recording medium 5, respectively. Since the first ink can be ejected, the first ink can be ejected over a wider area of the recording medium 5 in the sub-scanning direction X when the carriage 20 reciprocates in the main scanning direction Y one time. That is, the first ink can be cured to form the first ink layer 82 over a wider area of the recording medium 5 . As a result, the recording medium 5 can be moved faster in the sub-scanning direction X, so the first ink can be ejected over the entire recording medium 5 faster. A left third nozzle row 53L composed of left third nozzles 53A for ejecting the second ink is provided in parallel in the main scanning direction Y with respect to the left first nozzle row 51L. A fourth left nozzle row 54L composed of four nozzles 54A is provided in parallel in the main scanning direction Y with respect to the second left nozzle row 52L. That is, the left third nozzle row 53L and the left fourth nozzle row 54L are arranged to be shifted in the sub-scanning direction X. As shown in FIG. Therefore, when the carriage 20 reciprocates in the main scanning direction Y, the second ink is ejected toward the recording medium 5 from all the left third nozzles 53A of the left third nozzle array 53L. Since it is possible to simultaneously discharge the white ink onto the recording medium 5 from all the left fourth nozzles 54A of the nozzle row 54L, the second ink and the White ink can be ejected. Furthermore, since the recording medium 5 does not have to be pulled back after the white ink is ejected, the landing position deviation of the second ink and the white ink (that is, position deviation between the second ink layer 86 and the white underlayer 84) is suppressed. can do.

According to the printer 10 of this embodiment, the control device 70 ejects the first ink from the left first nozzle 51A and the left second nozzle 52A onto the recording medium 5 to form the first ink layer 82, and White ink is ejected onto the first ink layer 82 from the four nozzles 54A to form a white undercoat layer 84 on the first ink layer 82, and second ink is ejected onto the white undercoat layer 84 from the left third nozzle 53A. A first ink layer forming section 72 for forming a second ink layer 86 on the white underlayer 84 may be provided. Thereby, the first ink layer 82 , the white base layer 84 and the second ink layer 86 can be properly formed on the recording medium 5 .

According to the printer 10 of this embodiment, the first ink layer first forming section 72 forms the first ink layer 82 by ejecting the first ink onto the recording medium 5 from the left first nozzle 51A and the left second nozzle 52A. Also, the second ink is ejected from the left third nozzle 53A onto the first ink layer 82 to form the second ink layer 86 on the first ink layer 82, and the white ink is ejected from the left fourth nozzle 54A. A white base layer 84 may be formed on the second ink layer 86 by ejecting two ink layers 86 . Thereby, the first ink layer 82 , the second ink layer 86 and the white base layer 84 can be properly formed on the recording medium 5 .

According to the printer 10 of this embodiment, the first ink layer 82 is formed during the first movement that moves the recording medium 5 in the sub-scanning direction X, and the white base layer 84 and the second ink layer 86 are formed during the first movement. 1 and is formed during the second movement in which the recording medium 5 is moved in the sub-scanning direction X. FIG. Thus, the first ink layer 82, the white base layer 84, and the second ink layer 86 are not formed simultaneously when the recording medium 5 moves once in the sub-scanning direction X. Each layer can be formed under these conditions.

According to the printer 10 of this embodiment, the control device 70 controls the first table moving mechanism 36 to move the recording medium 5 in the forward direction X1 when forming the first ink layer 82, and to move the first ink layer 82. A movement control unit 76 is provided for moving the recording medium 5 in the return direction X2 after the layer 82 is formed, and for moving the recording medium 5 in the forward direction X1 when the white base layer 84 and the second ink layer 86 are formed. You may have In this way, the first ink layer 82, the white base layer 84, and the second ink layer 86 are formed in separate processes, so that the resolution and the feeding amount of the recording medium 5 can be made different in each process. . Here, since the first ink layer 82 has a relatively small influence on image quality, it can be formed with a relatively low resolution. That is, the first ink layer 82 can be formed faster.

According to the printer 10 of the present embodiment, the control device 70 ejects white ink from the fourth left nozzle 54A toward the recording medium 5 to form the white underlayer 84, and also ejects the white ink from the third left nozzle 53A to the second nozzle. Ink is ejected onto the white underlayer 84 to form a second ink layer 86 on the white underlayer 84, and the first ink is discharged onto the second ink layer 86 from the left first nozzle 51A and the left second nozzle 52A. may have a first ink layer post-forming section 74 for forming the first ink layer 82 on the second ink layer 86 by ejecting the first ink layer 82 on the second ink layer 86 . Thereby, the white base layer 84 , the second ink layer 86 and the first ink layer 82 can be properly formed on the recording medium 5 .

According to the printer 10 of this embodiment, the white base layer 84 and the second ink layer 86 are formed during the first movement of the recording medium 5 in the sub-scanning direction X, and the first ink layer 82 and the first ink layer 86 are formed. and is formed during the second movement in which the recording medium 5 is moved in the sub-scanning direction X. As shown in FIG. Thus, the white base layer 84, the second ink layer 86, and the first ink layer 82 are not formed simultaneously when the recording medium 5 moves once in the sub-scanning direction X. Each layer can be formed under these conditions.

According to the printer 10 of this embodiment, the control device 70 controls the first table moving mechanism 36 to move the recording medium 5 in the forward direction X1 when forming the white base layer 84 and the second ink layer 86, In addition, when the recording medium 5 is moved in the return direction X2 after the white underlayer 84 and the second ink layer 86 are formed, and when the first ink layer 82 is formed on the second ink layer 86, the recording medium 5 is A movement control unit 76 for moving in the forward direction X1 may be provided. In this way, the white base layer 84 and the second ink layer 86, and the first ink layer 82 are formed in different processes, so that the resolution and the feeding amount of the recording medium 5 can be made different in each process. . Here, since the first ink layer 82 has a relatively small influence on image quality, it can be formed with a relatively low resolution. That is, the first ink layer 82 can be formed faster.

According to the printer 10 of this embodiment, the interval between the left first nozzles 51A of the left first nozzle row 51L and the interval between the left second nozzles 52A of the left second nozzle row 52L are equal. As a result, the first ink can be ejected using all of the left first nozzles 51A and the left second nozzles 52A.

The preferred embodiments of the present invention have been described above. However, the above-described embodiments are merely examples, and the present invention can be embodied in various other forms.

When the first ink layer 82 is formed first, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the return direction X2 to form the first ink layer 82. After that, the recording medium 5 may be moved in the forward direction X1 to form the white base layer 84 and the second ink layer 86 . Further, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the going direction X1 to form the first ink layer 82, and then moves the recording medium 5 in the returning direction X2. The white base layer 84 and the second ink layer 86 may be formed. Further, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the return direction X2 when forming the first ink layer 82, and to move the recording medium 5 in the return direction X2 when the first ink layer 82 is formed. The recording medium 5 may be moved in the forward direction X1 later, and moved in the backward direction X2 when the white base layer 84 and the second ink layer 86 are formed.

When the first ink layer 82 is formed later, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the return direction X2 to form the white underlayer 84 and the second ink. After the layer 86 is formed, the first ink layer 82 may be formed on the second ink layer 86 by moving the recording medium 5 in the forward direction X1. Further, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the forward direction X1 to form the white base layer 84 and the second ink layer 86, and then move the recording medium 5. The first ink layer 82 may be formed on the second ink layer 86 by moving in the return direction X2. Further, the movement control unit 76 controls the first table movement mechanism 36 to move the recording medium 5 in the return direction X2 when forming the white underlayer 84 and the second ink layer 86, and to move the recording medium 5 in the return direction X2. and after the second ink layer 86 is formed, the recording medium 5 is moved in the forward direction X1, and when the first ink layer 82 is formed, the recording medium 5 is moved in the return direction X2. good.

In the embodiment described above, the printer 10 has one ultraviolet irradiation device 40 , but may have two ultraviolet irradiation devices 40 . That is, the ultraviolet irradiation device 40 may be provided on each of the right and left sides of the ink head 50 .

After sequentially forming a first ink layer 82, a white undercoat layer 84, and a second ink layer 86 each made of primer ink on the recording medium 5, the gloss ink is ejected onto the second ink layer 86 to remove the ink from the gloss ink. A structured first ink layer 82 may be formed.

In the above-described embodiment, the first ink head 51 and the third ink head 53 are provided separately, but they may be integrated. Further, although the second ink head 52 and the fourth ink head 54 are provided separately, they may be integrated.

In the above-described embodiment, the ink head 50 is configured to eject photocurable ink, but the present invention is not limited to this. The ink head 50 ejects, for example, thermosetting ink such as electron beam curing ink or latex ink, or heat drying ink such as aqueous latex ink or solvent ink in which the solvent evaporates when heated. Alternatively, an underlayer may be formed as described above and an image may be formed thereon with process color inks and white ink.

In the above-described embodiment, the printer 10 sub-scans the recording medium 5 with respect to the carriage 20 by moving the table 35 on which the recording medium 5 is placed relative to the carriage 20 in the sub-scanning direction X. Although the first table moving mechanism 36 that relatively moves in the direction X is provided as a moving device, the present invention is not limited to this. For example, by fixing the table 35 to the housing 12 and moving the carriage 20 relative to the table 35 in the sub-scanning direction X, the recording medium 5 can move relative to the carriage 20 in the sub-scanning direction X. A moving device for moving may be provided.

The technology disclosed herein can be applied to various types of printers. In addition to the flatbed type printer 10 shown in the embodiment described above, for example, the present invention can be similarly applied to a so-called Roll-to-Roll type printer 10 that conveys a roll-shaped recording medium 5 in the sub-scanning direction X. be able to.

5 recording medium 10 printer (inkjet printer)
20 carriage 35 table (mounting table)
36 First table moving mechanism (moving device)
40 UV irradiation device (light irradiation device)
51 1st ink head 52 2nd ink head 53 3rd ink head 54 4th ink head 70 control device 72 first ink layer former formation section 74 first ink layer post formation section 76 movement control section

Claims (7)

a mounting table on which the recording medium is mounted;
A first ink head having a first nozzle row in which a plurality of first nozzles are aligned in a first direction for ejecting a first ink toward the recording medium to be used for base formation before image formation or for surface finishing after image formation. and,
An ink head arranged in a second direction intersecting the first direction with respect to the first ink head, wherein a plurality of second nozzles for ejecting the first ink toward the recording medium are arranged in the first ink head. a second ink head having a second nozzle row arranged in one direction and partly arranged in parallel with the first nozzle row in the second direction;
A plurality of third nozzles for ejecting a second ink used for image formation toward the recording medium are arranged in the first direction and arranged in parallel with the first nozzle row in the second direction. a third nozzle row;
a fourth nozzle row in which a plurality of fourth nozzles for ejecting white ink toward the recording medium are arranged in the first direction and arranged in parallel with the second nozzle row in the second direction; ,
a carriage provided movably in the second direction and including the first ink head, the second ink head, the third nozzle row, and the fourth nozzle row;
a moving device capable of moving one of the mounting table and the carriage relative to the other in the first direction;
a controller;
The control device discharges the first ink from the first nozzle and the second nozzle onto the recording medium to form a first ink layer, and discharges the white ink from the fourth nozzle to the first ink. A white underlayer is formed on the first ink layer by ejecting the second ink onto the white underlayer by ejecting the second ink from the third nozzle onto the white underlayer to form a second ink layer on the white underlayer. An inkjet printer having a first ink layer first forming section capable of executing first ejection control to form . The first ink layer first forming section ejects the first ink from the first nozzle and the second nozzle onto the recording medium to form a first ink layer, and ejects the first ink from the third nozzle to the second ink layer. ejecting ink onto the first ink layer to form a second ink layer on the first ink layer; and ejecting the white ink from the fourth nozzle onto the second ink layer to form the second ink layer. 2. The inkjet printer according to claim 1 , configured to be able to execute a second ejection control for forming a white base layer on the layer. the first ink layer is formed during a first movement that moves the recording medium relative to the carriage in the first direction;
The white underlayer and the second ink layer are formed after the first movement and during a second movement that moves the recording medium relative to the carriage in the first direction. 3. An ink jet printer as claimed in claim 1 or 2 , formed in a . When a direction from one of the first directions to the other is defined as a forward direction and a direction from the other of the first directions is defined as a return direction, the control device controls the moving device to When the first ink layer is formed, the recording medium is moved relative to the carriage in the forward direction, and after the first ink layer is formed, the recording medium is moved relative to the carriage. and a movement control unit for moving the recording medium in the return direction relative to the carriage when forming the white underlayer and the second ink layer. 3. The inkjet printer according to 3 above. a mounting table on which the recording medium is mounted;
A first ink head having a first nozzle row in which a plurality of first nozzles are aligned in a first direction for ejecting a first ink toward the recording medium to be used for base formation before image formation or for surface finishing after image formation. and,
An ink head arranged in a second direction intersecting the first direction with respect to the first ink head, wherein a plurality of second nozzles for ejecting the first ink toward the recording medium are arranged in the first ink head. a second ink head having a second nozzle row arranged in one direction and partly arranged in parallel with the first nozzle row in the second direction;
A plurality of third nozzles for ejecting a second ink used for image formation toward the recording medium are arranged in the first direction and arranged in parallel with the first nozzle row in the second direction. a third nozzle row;
a fourth nozzle row in which a plurality of fourth nozzles for ejecting white ink toward the recording medium are arranged in the first direction and arranged in parallel with the second nozzle row in the second direction; ,
a carriage provided movably in the second direction and including the first ink head, the second ink head, the third nozzle row, and the fourth nozzle row;
a moving device capable of moving one of the mounting table and the carriage relative to the other in the first direction;
a controller;
The control device ejects the white ink from the fourth nozzle toward the recording medium to form a white underlayer, and ejects the second ink from the third nozzle onto the white underlayer. A second ink layer is formed on the white underlayer, and the first ink is ejected from the first nozzle and the second nozzle onto the second ink layer to form a first ink layer on the second ink layer. Having a first ink layer post-forming section for forming an ink layer,
the white underlayer and the second ink layer are formed during a first movement of moving the recording medium relative to the carriage in the first direction;
the first ink layer is formed during a second movement subsequent to the first movement and moving the recording medium relative to the carriage in the first direction;
When a direction from one of the first directions to the other is defined as a forward direction and a direction from the other of the first directions is defined as a return direction, the control device controls the moving device to When the white underlayer and the second ink layer are formed, the recording medium is moved in the forward direction relative to the carriage, and after the white underlayer and the second ink layer are formed, the When the recording medium is moved in the return direction relative to the carriage and the first ink layer is formed on the second ink layer, the recording medium is moved relative to the carriage in the return direction. An inkjet printer having a movement control for moving in a direction . The first ink, the second ink, and the white ink are photocurable inks,
further comprising a light irradiation device for irradiating light onto the first ink, the second ink, and the white ink ejected toward the recording medium;
The control device is
After ejecting the first ink from the first nozzle and the second nozzle, the ejected first ink is irradiated with light from the light irradiation device to form a first ink layer;
After ejecting the second ink from the third nozzle, the ejected second ink is irradiated with light from the light irradiation device to form a second ink layer;
6. The apparatus according to any one of claims 1 to 5 , wherein after the white ink is ejected from the fourth nozzle, the ejected white ink is irradiated with light from the light irradiation device to form a white underlayer. An inkjet printer according to any one of the preceding paragraphs. 7. The inkjet printer according to any one of claims 1 to 6 , wherein the spacing between said first nozzles and the spacing between said second nozzles are equal.

Images