JP5235106B2 - Inkjet printer, print data processing method, and print data processing program - Google Patents

Description

  The present invention relates to an ink jet printer in which a plurality of ink jet heads having a plurality of nozzles are arranged in the main scanning direction, a print data processing method of the ink jet printer, and a print data processing program.

2. Description of the Related Art Conventionally, an ink jet printer including a head unit in which a plurality of ink jet heads having a plurality of nozzles are arranged in the main scanning direction is known. This inkjet printer can perform printing in a single pass format in which printing is performed in one pass, printing in a multi pass format in which printing is performed in a plurality of passes, and the like. The ink jet printer prints on the medium placed on the platen by reciprocating the head unit in the main scanning direction, and then the medium is moved by a predetermined pitch in the transport direction orthogonal to the main scanning direction. Transport. The entire medium is printed by repeating the movement of the head unit and the conveyance of the medium (see, for example, Patent Document 1).
JP 09-058016 A

  By the way, generally, the scanning interval due to the movement of the head unit is short, and the ink that has landed on the end of the line is mixed with the ink that has landed in the next scanning and spreads, causing banding.

  However, in the conventional ink jet printer, since the nozzle arrays of the effective nozzles used for printing in each ink jet head are all arranged at the same position in the main scanning direction, the density difference between lines or passes becomes large. . For example, in single-pass printing, 100 (%) density printing is performed for each line, and in multi-pass printing, 100 / pass density (%) printing is performed for each pass. That is, the density difference between lines or passes is 100 / number of passes (%). For this reason, the conventional ink jet printer has a problem that the banding cannot be sufficiently reduced and the print image quality is deteriorated.

  SUMMARY An advantage of some aspects of the invention is that it provides an inkjet printer, a print data processing method, and a print data processing program that can improve the print image quality by suppressing the occurrence of banding.

An ink jet printer according to the present invention includes a plurality of ink jet heads having a plurality of nozzles in a sub scanning direction orthogonal to the main scanning direction and at least partially overlapping in the main scanning direction. Nozzles that move in the direction and move relative to each other in the sub-scanning direction and print on the medium each time scanning is performed, and nozzles that are shifted by a predetermined width in the sub-scanning direction between the ink-jet heads and effective nozzles used nozzle array of the print, have a correlating means for correlating the print data to enable the nozzles of the ink jet heads, a predetermined width, the relative movement range of the inkjet head and the media by the number of ink jet heads The width is a divided width .

  According to the ink jet printer of the present invention, the nozzle row shifted by a predetermined width in the sub-scanning direction between the ink jet heads becomes the effective nozzle of each ink jet head, and the print data is associated with the effective nozzle. For this reason, when ink is ejected from the effective nozzles of each ink jet head when each ink jet head moves in the main scanning direction, the print images printed by the ink jet heads are shifted from each other by a predetermined width in the sub scanning direction. It becomes. That is, since the print density changes according to the overlap of the print images, the print density at the edge of the print image can be lowered. Thereby, since the density difference of the print image in the sub-scanning direction can be reduced, the occurrence of banding can be suppressed and the print image quality can be improved.

Moreover, according to this ink jet printer, the nozzle array of the effective nozzles in each ink jet head is shifted by the width obtained by dividing the relative movement width of the ink jet head and the medium by the number of ink jet heads. The width can be made the same, and the density difference between the passes can be surely reduced.

  Further, it is preferable that the association unit shifts the nozzle row of the effective nozzles by a predetermined width in the sub-scanning direction for each inkjet head. According to this ink jet printer, the print images printed by the respective ink jet heads can be shifted in the sub-scanning direction by a predetermined width by shifting the nozzle row of the effective nozzles in the sub-scanning direction for each ink jet head. For this reason, the density difference between passes can be reduced regardless of the arrangement relationship of each inkjet head, and the occurrence of banding can be suppressed to improve the print image quality.

  Each inkjet head is preferably arranged in an in-line arrangement in the main scanning direction. According to this ink jet printer, since the ink jet heads are arranged in an in-line arrangement, each ink jet head can be easily positioned.

  Each ink jet head is preferably arranged at a position shifted by a predetermined width in the sub-scanning direction. According to this inkjet printer, since each inkjet head is arranged at a position shifted by a predetermined width in the sub-scanning direction, a print image printed by each inkjet head without shifting the arrangement relationship of the effective nozzles for each inkjet head. Can be shifted from each other by a predetermined width in the sub-scanning direction. For this reason, the number of nozzles that are not used for printing can be reduced and the ratio of the number of effective nozzles to the total number of nozzles can be increased, so that the printing speed can be improved.

A print data processing method according to the present invention includes a plurality of inkjet heads having a plurality of nozzles in a sub-scanning direction orthogonal to the main scanning direction and at least partially overlapping in the main scanning direction. A print data processing method for print data printed by an inkjet printer that moves in the main scanning direction and moves relative to each other in the sub-scanning direction and prints on the medium for each scan. a nozzle row of nozzles shifted by a predetermined width in the sub-scanning direction between the ink jet head and effective nozzles used for printing, have a correspondence step for associating the print data to enable the nozzles of the ink jet head, a predetermined width, the inkjet head and the media Relative movement width with inkjet head Characterized in that the width divided by the number.

  According to the print data processing method of the present invention, a nozzle row shifted by a predetermined width in the sub-scanning direction between the inkjet heads becomes an effective nozzle of each inkjet head, and the print data is associated with the effective nozzle. For this reason, when ink is ejected from the effective nozzles of each ink jet head when each ink jet head moves in the main scanning direction, the print images printed by the ink jet heads are shifted from each other by a predetermined width in the sub scanning direction. It becomes. That is, since the print density changes according to the overlap of the print images, the print density at the edge of the print image can be lowered. Thereby, since the density difference of the print image in the sub-scanning direction can be reduced, the occurrence of banding can be suppressed and the print image quality can be improved.

A print data processing program according to the present invention includes a plurality of inkjet heads having a plurality of nozzles in a sub-scanning direction orthogonal to the main scanning direction and at least partially overlapping in the main scanning direction. A print data processing program for print data to be printed by an inkjet printer that moves in the main scanning direction and moves relative to the sub-scanning direction and prints on the medium for each scan. A nozzle array of nozzles shifted by a predetermined width in the sub-scanning direction between the inkjet heads is used as an effective nozzle for printing, and an association step for associating print data with the effective nozzles of each inkjet head is caused to function on the computer, and the predetermined width is set to the inkjet Relative of head and media The Do movement width and said width and to Rukoto divided by the number of ink jet heads.

  According to the print data processing program according to the present invention, the nozzle row shifted by a predetermined width in the sub-scanning direction between the inkjet heads becomes the effective nozzle of each inkjet head, and the print data is associated with the effective nozzle. For this reason, when ink is ejected from the effective nozzles of each ink jet head when each ink jet head moves in the main scanning direction, the print images printed by the ink jet heads are shifted from each other by a predetermined width in the sub scanning direction. It becomes. That is, since the print density changes according to the overlap of the print images, the print density at the edge of the print image can be lowered. Thereby, since the density difference of the print image in the sub-scanning direction can be reduced, the occurrence of banding can be suppressed and the print image quality can be improved.

  According to the present invention, it is possible to suppress the occurrence of banding and improve the print image quality.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of an inkjet printer, a print data processing method, and a print data processing program according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a plan view of the ink jet printer according to the present embodiment. As shown in FIG. 1, the inkjet printer 1 according to the first embodiment is an inkjet printer that prints an image on a medium 3 conveyed on a platen 2, and performs printing in multiple passes. This is a multi-pass inkjet printer.

  The ink jet printer 1 is provided with a transport roller 4 for transporting the medium 3 placed on the platen 2 in the transport direction (sub-scanning direction) B. The transport roller 4 transports the media 3 in the transport direction B at a predetermined pitch.

  Further, the ink jet printer 1 is provided with a guide rail 5 that extends in the main scanning direction A above the platen 2 (front side in FIG. 1). The guide rail 5 is formed in a rod shape extending in the main scanning direction A. The guide rail 5 holds a head unit 6 on which an ink jet head 7 for discharging ink is mounted so as to be movable in the extending direction of the guide rail 5.

  The head unit 6 is provided with ink jet heads 7a and 7b each having a plurality of nozzles for ejecting ink. The head unit 6 can be moved in a main scanning direction A (leftward in FIG. 1) and in a direction opposite to the main scanning direction A (rightward in FIG. 1) by a driving unit (not shown). The movement of the head unit 6 is realized, for example, by rotating a conveyance belt connected to the head unit 6 with a motor or the like. The rear end (right end in FIG. 1) of the guide rail 5 in the main scanning direction A is the standby position of the head unit 6.

  FIG. 2 is an enlarged view of the nozzle surface of the inkjet head in the head unit. As shown in FIG. 2, the ink jet heads 7 a and 7 b are arranged in an inline arrangement in the head unit 6. That is, the ink jet heads 7 a and 7 b are arranged in the head unit 6 so as to overlap in the main scanning direction A. The inkjet heads 7a and 7b each include a plurality of nozzles 8 arranged in a line in the transport direction B. The plurality of nozzles 8 include a plurality of unused nozzles 8a disposed at both ends (the front end portion in the transport direction B and the rear end portion in the transport direction B) of the inkjet heads 7a and 7b, and the unused front end portion in the transport direction B. A plurality of effective nozzles 8b arranged between the nozzles 8a and the unused nozzles 8a at the rear end in the transport direction B are configured. That is, the unused nozzles 8a arranged at both ends of the ink jet heads 7a and 7b cause the image quality of the printed image to deteriorate due to generation of satellites and the like. For this reason, actual printing is performed by the effective nozzles 8b excluding the unused nozzles 8a. As will be described later, the nozzle rows of the effective nozzles 8b in the inkjet heads 7a and 7b are arranged with a predetermined width W shifted in the transport direction B.

  As shown in FIG. 1, the inkjet printer 1 is provided with a control unit 10 that acquires print data and performs print control. FIG. 3 shows the flow of print data. As shown in FIG. 3, the control unit 10 acquires print data transmitted from the personal computer 9. The acquired print data is data that has been subjected to gradation processing by the RIP installed in the personal computer 9. And the control part 10 specifies the effective nozzle 8b of each inkjet head 7a, 7b, and matches this print data with each effective nozzle 8b of each inkjet head 7a, 7b. Then, the control unit 10 controls the ink jet heads 7a and 7b to discharge, thereby forming a print image of print data on the medium 3.

  FIG. 4 is a diagram illustrating a functional configuration example of the control unit. As illustrated in FIG. 4, the control unit 10 functions as a print data acquisition unit 11, an effective nozzle identification unit 12, an association unit 13, a media transport control unit 14, a head unit drive control unit 15, and an ejection control unit 16. In addition, the control part 10 is comprised mainly by the computer containing CPU, ROM, and RAM, for example. Each function described in FIG. 4 is realized by reading predetermined computer software on the CPU or RAM and operating it under the control of the CPU.

  The print data acquisition unit 11 acquires the print data transmitted from the personal computer 9. As described above, the print data acquired by the print data acquisition unit 11 is print data that has been subjected to gradation control in the RIP installed in the personal computer 9. Then, the print data acquisition unit 11 temporarily stores the print data acquired from the personal computer 9 in a picture memory (not shown).

  The effective nozzle specifying unit 12 specifies the effective nozzle 8b in each of the inkjet heads 7a and 7b. That is, the effective nozzle specifying unit 12 is arranged such that the nozzle row of the effective nozzle 8b in the inkjet head 7a and the nozzle row of the effective nozzle 8b in the inkjet head 7b are arranged with a predetermined width W shifted in the transport direction B. The effective nozzle 8b of the inkjet head 7a and the effective nozzle 8b of the inkjet head 7b are specified. Here, the predetermined width W is a width obtained by dividing a predetermined pitch for transporting the medium 3 for each scan by the number of ink jet heads 7 (two in this embodiment). In addition, when the position of the effective nozzle 8b is fixed in the inkjet heads 7a and 7b, the effective nozzle 8b at the end is set to the unused nozzle 8a (by disabling the effective nozzle 8b at the end), The nozzle row of the effective nozzles 8b in the inkjet head 7a and the nozzle row of the effective nozzles 8b in the inkjet head 7b can be arranged with a predetermined width W shifted in the transport direction B.

  The associating unit 13 associates the print data acquired by the print data acquiring unit 11 with the effective nozzles 8b specified by the effective nozzle specifying unit 12. That is, the associating unit 13 associates the print data with the nozzle rows of the effective nozzles 8b in the inkjet head 7a and the nozzle rows of the effective nozzles 8b in the inkjet head 7b, which are arranged with a predetermined width W shifted in the transport direction B.

  The media conveyance control unit 14 performs drive control of the conveyance roller 4 and conveys the medium 3 placed on the platen 2 in the conveyance direction B by a predetermined pitch every scan.

  The head unit drive control unit 15 performs drive control of the head unit 6 and moves the head unit 6 in the main scanning direction A and in the reverse direction of the main scanning direction A at a predetermined speed.

  The ejection control unit 16 performs ejection control on the inkjet heads 7a and 7b based on the print data associated with the effective nozzles 8b in the association unit 13. That is, the ejection control unit 16 performs ejection control on the inkjet heads 7a and 7b, thereby ejecting ink from the effective nozzles 8b.

  Next, the operation of the inkjet printer 1 according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing the processing operation of the control unit. The operation of the inkjet printer 1 described below is performed under the control of the control unit 10. That is, in the control unit 10, a processing unit (not shown) configured by a CPU or the like follows a program recorded in a storage device such as a ROM, in accordance with a print data acquisition unit 11, an effective nozzle specifying unit 12, an association unit 13, The following processing is performed by comprehensively managing the functions of the media conveyance control unit 14, the head unit drive control unit 15, the discharge control unit 16, and the like.

  First, the control unit 10 acquires print data transmitted from the personal computer 9 (step S1). The acquired print data is temporarily stored in a picture memory (not shown).

  Next, the control part 10 specifies the effective nozzle 8b in each inkjet head 7a, 7b (step S2). That is, in step S2, the control unit 10 arranges the nozzle row of the effective nozzles 8b in the inkjet head 7a and the nozzle row of the effective nozzles 8b in the inkjet head 7b so as to be shifted by a predetermined width W in the transport direction B. The effective nozzle 8b of the inkjet head 7a and the effective nozzle 8b of the inkjet head 7b are specified.

  Next, the control unit 10 associates the print data acquired by the print data acquisition unit 11 with the effective nozzle 8b specified by the effective nozzle specifying unit 12 (step S3). That is, in step S3, the associating unit 13 prints the print data on the nozzle rows of the effective nozzles 8b in the inkjet head 7a and the nozzle rows of the effective nozzles 8b in the inkjet head 7b, which are arranged with a predetermined width W shifted in the transport direction B. Associate.

  Next, when the medium 3 is set at the initial printing position (printing start position when moving for each pass), the control unit 10 performs drive control of the head unit 6 and controls the head unit 6 at a predetermined speed. To issue a command to move in the main scanning direction A (step S4). Then, the head unit 6 that has received this command moves in the main scanning direction A at a predetermined speed.

  Next, the control unit 10 instructs the inkjet head 7 to eject ink (step S5). That is, in step S4, when the effective nozzle 8b of each inkjet head 7a, 7b comes to a position where ink should be ejected by the movement of the head unit 6, the control unit 10 prints corresponding to the effective nozzle 8b in step S3. Based on the data, an ejection command for ejecting ink from each effective nozzle 8b is issued. Then, the effective nozzles 8 b of the inkjet heads 7 a and 7 b eject ink toward the medium 3.

  Next, when the main scanning is completed, the control unit 10 performs drive control of the head unit 6 so that the head unit 6 moves in a direction opposite to the main scanning direction A at a predetermined speed and returns to the standby position. A command is issued (step S6). Then, the head unit 6 that has received this command moves in the reverse direction of the main scanning direction A and returns to the standby position.

  Next, the control unit 10 performs drive control of the transport roller 4 and issues a command so that the medium 3 is transported in the transport direction B by a predetermined pitch (step S7). Then, the transport roller 4 transports the medium 3 in the transport direction B by a predetermined pitch by a predetermined pitch. Then, the medium 3 is set at the printing position of the next line.

  Next, the control unit 10 determines whether printing has been completed (step S8). If it is determined in step S8 that printing has not been completed (step S8: NO), the control unit 10 returns to step S1 and repeats the above processing (steps S1 to S7) again. On the other hand, when it is determined in step S8 that printing is completed (step S8: YES), the control unit 10 ends the printing process.

  FIG. 6 is a diagram for explaining printing by a conventional ink jet printer, and FIG. 7 is a diagram for explaining printing by the ink jet printer according to the present embodiment. 6 and 7 illustrate a case where the medium 3 is transported in the transport direction B by a predetermined pitch P for each scan. 6 and 7, the conventional inkjet printer and the inkjet printer 1 according to the present embodiment are provided with two inkjet heads in the head unit. The left figure (a) shows the positional relationship between the medium 3 for each scan and the nozzle arrays A and B of the effective nozzles, and the right figure (b) is printed on the medium 3 for each scan. The print density of the print image is shown.

  As shown in FIG. 6, in the conventional inkjet printer, the nozzle rows A and B of the effective nozzles in each inkjet head are arranged at the same position in the transport direction B. For this reason, when printing with this conventional ink jet printer, the pass width is the transport width of the medium 3, and the density difference between passes is a value obtained by dividing 100% by the number of passes. That is, the pass width is a predetermined pitch P, and the density difference between passes is 16.7%.

  On the other hand, as shown in FIG. 7, in the inkjet printer 1 according to the present embodiment, the nozzle row A and the nozzle row B are arranged so as to be shifted by a half width of the predetermined pitch P in the transport direction B. Yes. For this reason, when printing with the inkjet printer 1, the width of the pass is the width obtained by dividing the transport width of the medium 3 by the number of inkjet heads, and the density difference between passes is 100% multiplied by the number of passes and the number of inkjet heads. The value divided by the value. That is, the pass width is a predetermined pitch P / 2, and the density difference between passes is 8.3%.

  As described above, according to the present embodiment, the nozzle rows arranged with a predetermined width W shifted in the transport direction B between the inkjet heads 7a and 7b become the effective nozzles 8b of the inkjet heads 7a and 7b. The print data is associated with 8b. Therefore, when ink is ejected from the effective nozzles 8b of the ink jet heads 7a and 7b when the ink jet heads 7a and 7b move in the main scanning direction A, the print images printed by the ink jet heads 7a and 7b are as follows. The positions are shifted from each other by a predetermined width W in the transport direction B. That is, since the print density changes according to the overlap of the print images, the print density at the edge of the print image can be lowered. As a result, the density difference between passes in the transport direction B can be reduced, so that the occurrence of banding can be suppressed and the print image quality can be improved.

  Further, according to the inkjet printer 1, the nozzle rows of the effective nozzles 8b in the inkjet heads 7a and 7b are arranged at positions shifted by the width obtained by dividing the transport width of the medium 3 by the number of inkjet heads 7a and 7b. Therefore, the widths of all the passes can be made the same, and the density difference between the passes can be surely reduced.

  Further, according to the ink jet printer 1, the print images printed by the ink jet heads 7a and 7b are mutually shifted by shifting the nozzle row of the effective nozzles 8b by a predetermined width W in the transport direction B for each of the ink jet heads 7a and 7b. A predetermined width W can be shifted in the transport direction B. For this reason, regardless of the arrangement relationship of the inkjet heads 7a and 7b, the density difference between passes can be reduced, and the occurrence of banding can be suppressed to improve the print image quality.

  Further, according to this ink jet printer, since the ink jet heads 7a and 7b are arranged in an in-line arrangement, the ink jet heads 7a and 7b can be easily positioned.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the functions of the effective nozzle specifying unit 12 and the associating unit 13 have been described as being provided in the control unit 10 provided in the inkjet printer 1, but are provided in the RIP provided in the personal computer 9 or the like. It is good. As described above, by providing the RIP with the functions of the effective nozzle specifying unit 12 and the associating unit 13, more flexible and advanced processing can be performed without being limited to the processing capability of the inkjet printer 1.

  In the above embodiment, the control unit 10 has been described as shifting the effective nozzle 8b by the predetermined width W. However, the effective nozzle 8b may be set in advance by shifting by the predetermined width W.

  In the above-described embodiment, the two inkjet heads 7a and 7b are described as being arranged in an in-line arrangement. For example, as shown in the head unit 16 illustrated in FIG. 8, the two inkjet heads 17a and 17b are transported. It may be arranged so as to be shifted by a predetermined width W in the direction B. By doing in this way, since each inkjet head 17a, 17b is arrange | positioned in the position shifted | deviated by the predetermined width W in the conveyance direction B, without shifting the arrangement | positioning relationship of the effective nozzle 8b for every inkjet head 17a, 17b, each Print images printed by the inkjet heads 17a and 17b can be shifted from each other by a predetermined width W in the transport direction B. For this reason, since the number of the unused nozzles 8a not used for printing can be reduced and the ratio of the number of effective nozzles 8b to the total number of nozzles can be increased, the printing speed can be improved.

  In the above-described embodiment, the two inkjet heads 7 are arranged in the head unit 6 in an in-line arrangement. However, two or more inkjet heads may be arranged at least partially overlapping in the main scanning direction A. For example, the number and arrangement of the ink jet heads may be any, such as a staggered arrangement. For example, four inkjet heads may be arranged in a staggered arrangement.

  In the above embodiment, the plurality of nozzles 8 provided in the inkjet head 7 are described as being arranged in a line in the transport direction B, but are arranged in a plurality of lines in the transport direction B. There may be.

  In the above-described embodiment, it has been described that ink is ejected from the inkjet head 7 only when the head unit 6 moves in the main scanning direction A. However, when the head unit 6 moves in the direction opposite to the main scanning direction A. Alternatively, a bidirectional ejection method in which ink is ejected from the inkjet head 7 may be used.

  In the above-described embodiment, the inkjet printer 1 is provided with the conveyance roller 4 in order to convey the medium 3. However, the medium 3 may be conveyed by a mechanism other than the conveyance roller 4.

  In the above embodiment, the medium 3 and the head unit 6 are moved relative to each other in the conveyance direction B by conveying the medium 3 in the conveyance direction B. Alternatively, any of the head units 6 may be used, and both of them may be moved. For example, the present invention is applied to a flat bed type inkjet printer including a flat bed on which the medium 3 is placed and fixed, and a mechanism for moving the head unit 6 in the transport direction B and the direction opposite to the transport direction B. May be. Even in this flat bed type ink jet printer, since the ink is ejected when the head unit 6 is moved in the main scanning direction A or in the reverse direction of the main scanning direction A, the same effect as the ink jet printer 1 is obtained. be able to.

  Further, in the above-described embodiment, the process of specifying the effective nozzles in each inkjet head and the process of associating the print data with the specified effective nozzles are performed according to a program recorded in a storage device such as a ROM. However, it may be realized by, for example, an ASIC (Application Specific Integrated Circuit) together with the RIP function or separately from the RIP function.

It is a top view of the ink jet printer concerning this embodiment. It is the figure which expanded the nozzle surface of the inkjet head in a head unit. FIG. 5 is a diagram illustrating a flow of print data. It is the figure which showed the function structural example of the control part. It is a flowchart which shows the processing operation of a control part. It is a figure which shows the printing image for every scanning in the case of printing with the conventional inkjet printer. It is a figure for demonstrating the density difference between passes in the case of printing with the conventional inkjet printer. It is the figure which expanded the nozzle surface of the inkjet head in another head unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inkjet printer, 3 ... Media, 6 ... Head unit, 7 ... Inkjet head, 8 ... Nozzle, 8a ... Unused nozzle, 8b ... Effective nozzle, 10 ... Control part, 11 ... Print data acquisition part, 12 ... Effective nozzle Specific part, 13 ... Association part, 14 ... Media transport control part, 15 ... Head unit drive control part, 16 ... Discharge control part, A ... Main scanning direction, B ... Transport direction, W ... Predetermined width.

Claims (6)

A plurality of inkjet heads having a plurality of nozzles in the sub-scanning direction orthogonal to the main scanning direction and at least partially overlapping in the main scanning direction, and each of the inkjet heads moving in the main scanning direction Each inkjet head and the medium move relative to each other in the sub-scanning direction for each scan, and print on the medium.
Wherein the effective nozzle used a nozzle row of the nozzles shifted by a predetermined width in the sub-scanning direction on the print between the ink jet heads, have a correlating means for correlating the print data said in the effective nozzles of the ink jet head,
The ink jet printer according to claim 1, wherein the predetermined width is a width obtained by dividing a relative movement width of the ink jet head and the medium by the number of the ink jet heads . 2. The ink jet printer according to claim 1 , wherein the correlating means shifts the nozzle row of the effective nozzles by the predetermined width in the sub scanning direction for each ink jet head. Wherein the ink jet head, an ink jet printer according to claim 1, characterized in that it is arranged in an inline array in the main scanning direction. The inkjet printer according to claim 1 , wherein each of the inkjet heads is disposed at a position shifted by the predetermined width in the sub-scanning direction. A plurality of inkjet heads having a plurality of nozzles in the sub-scanning direction orthogonal to the main scanning direction and at least partially overlapping in the main scanning direction, and each of the inkjet heads moving in the main scanning direction A print data processing method of print data printed by an inkjet printer that prints on a medium by moving each inkjet head and the medium relatively in the sub-scanning direction for each scan,
Wherein the effective nozzle used a nozzle row of the nozzles shifted by a predetermined width in the sub-scanning direction in printing between each of the inkjet heads, we have a correspondence step for associating print data said in the effective nozzles of the ink jet head,
The print data processing method , wherein the predetermined width is a width obtained by dividing a relative movement width of the ink jet head and the medium by the number of the ink jet heads . A plurality of inkjet heads having a plurality of nozzles in a sub-scanning direction orthogonal to the main scanning direction and at least partially overlapping in the scanning direction, wherein each of the inkjet heads moves in the main scanning direction and scans A print data processing program for print data printed by an ink jet printer that prints on a medium by moving each ink jet head and the medium relative to each other in the sub-scanning direction,
An association step of associating print data with the effective nozzles of the inkjet heads, with the nozzle rows of the nozzles shifted by a predetermined width in the sub-scanning direction between the inkjet heads as effective nozzles used for printing;
Make the computer work ,
The print data processing program characterized in that the predetermined width is a width obtained by dividing a relative movement width of the inkjet head and the medium by the number of the inkjet heads .

Images