JP2010221478A - Image forming system and image forming apparatus - Google Patents

Abstract

The present invention provides a technique capable of forming an image on a relatively wide image forming medium and improving the resolution capable of forming an image.
The resolution of the printer driver 6a that acquires the resolution information at the time of image formation for the image to be image-formed and the nozzle array 22 in the paper width direction orthogonal to the transport direction is the resolution at which the acquired image is formed. The head movement control unit 16c that adjusts the angle of the nozzle row 22 with respect to the paper width direction and the print data transfer processing unit 16b that forms an image on the paper using the nozzle row 22 with the adjusted angle are configured. To do.
[Selection] Figure 2

Description

  The present invention relates to an image forming system having nozzle rows arranged in a direction intersecting with a conveyance direction of an image forming medium.

  For example, a printer for industrial use has a high demand for printing speed, and a consumer printer that prints by moving the head in the width direction of the image forming medium (for example, paper) satisfies the demand for the printing speed. I can't. Therefore, a line ink jet printer equipped with a line head capable of ejecting ink over the entire range of one row in the paper width direction and capable of printing in the paper width direction without moving the head is adopted. It has become.

  For example, as a line head, the resolution of the nozzle is generally 180 dpi or 360 dpi. In recent years, there has been a demand for higher image quality, and a print resolution of 720 dpi or higher may be required.

  For example, in an inkjet printer provided with a head that can move in a direction perpendicular to the paper feed direction, there is a technique that can obtain a high-resolution image by providing a nozzle row that is inclined with respect to the direction of movement of the print head. It is known (see, for example, Patent Document 1).

JP-A-6-31923

  For example, considering that the technique disclosed in Patent Document 1 is applied to a line inkjet printer, it is necessary to provide a head that is considerably longer than the maximum paper width in the printer. However, there are problems that are technically difficult and costly.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of forming an image on a relatively wide image forming medium and improving resolution capable of forming an image. It is to provide.

  To achieve the above object, an image forming system according to a first aspect of the present invention is an image forming system having an array of nozzles arranged in a direction crossing a conveying direction of an image forming medium. The angle of the nozzle row with respect to the medium width direction is adjusted so that the resolution of the nozzle row in the medium width direction orthogonal to the transport direction becomes the resolution indicated by the acquired information. An angle control unit; and an image formation control unit configured to form an image on the image forming medium with the nozzle row having the adjusted angle. According to such an image forming system, the resolution at the time of image formation can be changed by adjusting the angle of the nozzle row with respect to the medium width direction. For this reason, an image can be formed with a relatively high resolution, and when a high resolution is not required, the width of the image forming medium that can be printed can be increased.

  In the image forming system, a first image forming data generating unit that generates first image forming data corresponding to a resolution at the time of image formation indicated by acquired information based on image data of an image to be image formed, and a nozzle array And second image formation data generating means for generating the second image formation data for supplying the first image formation data to the nozzle row whose angle is adjusted based on the adjusted angle. The control unit may form an image on the image forming medium by using the nozzle row whose angle is adjusted based on the second image forming data. According to such an image forming system, an image with an appropriate resolution can be formed by the nozzle row whose angle is adjusted based on the second image forming data.

  In the image forming system, the image forming medium is transported with respect to one end of the image forming medium, and the angle control means rotates around an axis in the vicinity of one end of the image forming medium in the nozzle array. You may make it adjust an angle. According to such an image forming system, when the image forming medium is transported with reference to one end of the image forming medium, an image can be formed by appropriately arranging the nozzle rows on the transported image forming medium.

  Further, in the image forming system, the image forming medium is conveyed with reference to a substantially center in the medium width direction of the image forming medium, and the angle control means is substantially in the center of the image forming medium in the medium width direction. The angle may be adjusted by rotating the nozzle row around a nearby axis. According to such an image forming system, when the image forming medium is transported based on the approximate center of the image forming medium, an image can be formed by appropriately arranging the nozzle rows on the transported image forming medium.

  In the above image forming system, the correspondence between the resolution at the time of image formation and the angle of the nozzle row with respect to the medium width direction so that the resolution of the nozzle row in the medium width direction orthogonal to the transport direction becomes the resolution at the time of image formation. Angle storage means for storing the angle, and the angle control means obtains the angle of the nozzle array corresponding to the resolution at the time of image formation indicated by the information from the angle storage means with respect to the medium width direction, and becomes the angle at which the nozzle array was obtained. You may make it adjust so. According to such an image forming system, it is possible to easily and appropriately grasp the angle of the nozzle in the medium width direction according to the resolution at the time of image formation, and to adjust the angle of the nozzle row.

  Further, the image forming system includes a plurality of nozzle rows arranged in a direction intersecting the conveyance direction of the image forming medium, and the nozzle positions of the nozzle rows in the direction intersecting the conveyance direction are shifted and arranged. The angle control means may adjust the angles of the plurality of nozzle rows with respect to the medium width direction. According to such an image forming system, the resolution at the time of image formation can be further increased.

  The image forming system includes a plurality of nozzle rows arranged in a direction intersecting the conveyance direction of the image forming medium, and at least one nozzle row is formed to be movable in the medium width direction orthogonal to the conveyance direction. It is also possible to further include movement control means for moving at least one nozzle row in the medium width direction so as to have a predetermined positional relationship with other nozzle rows. According to such an image forming system, at least one nozzle row can be moved so as to have a predetermined positional relationship with other nozzle rows. For example, an image in a range in the medium width direction that cannot be printed by another nozzle row is formed. By moving the nozzle row in this manner, the width of the image forming medium on which image formation is possible can be increased.

  In order to achieve the above object, an image forming apparatus according to a second aspect of the present invention is an image forming apparatus having nozzle rows arranged in a direction intersecting a conveyance direction of an image forming medium. Resolution acquisition means for acquiring resolution information at the time of image formation, and the media width of the nozzle row so that the resolution by the nozzle row in the medium width direction orthogonal to the transport direction becomes the resolution at the time of image formation indicated by the acquired information An angle control unit that adjusts an angle with respect to the direction; and an image formation control unit that forms an image on an image forming medium using a nozzle row having the adjusted angle. According to such an image forming apparatus, the image forming resolution can be changed by adjusting the angle of the nozzle row with respect to the medium width direction. Therefore, it is possible to form an image with a relatively high resolution, and when the high resolution is not necessary, it is possible to increase the width of the image forming medium on which an image can be formed.

1 is a partial configuration diagram of a printer according to an embodiment of the present invention. FIG. 1 is a functional configuration diagram of an image forming system according to an embodiment of the present invention. It is a figure which shows the angle management table which concerns on one Embodiment of this invention. It is a figure explaining the printing data and rotation correction printing data concerning one embodiment of the present invention. It is a flowchart of the print preparation process in PC which concerns on one Embodiment of this invention. 6 is a flowchart of a printing process in a printer according to an embodiment of the present invention. It is a partial block diagram of the printer which concerns on the 1st modification of this invention. It is a partial block diagram of the printer which concerns on the 2nd modification of this invention. It is a partial block diagram of the printer which concerns on the 3rd modification of this invention.

  Embodiments of the present invention will be described with reference to the drawings. The embodiments described below do not limit the invention according to the claims, and all the elements and combinations described in the embodiments are essential for the solution of the invention. Is not limited.

  First, a line inkjet printer (hereinafter referred to as a printer) as an example of an image forming apparatus in an image forming system according to an embodiment of the present invention will be described.

  FIG. 1 is a partial configuration diagram of a printer according to an embodiment of the present invention. FIG. 1 is a partial top view around the head in the printer 10. In FIG. 1, each nozzle is shown as seen through from above.

  The printer 10 includes a belt 26 that transports paper (image forming medium) such as paper, an OHP sheet, and cloth supplied from a paper feed tray (not shown). The belt 26 is driven by a motor (not shown). When performing printing (also referred to as printing or image formation) on a sheet, the belt 26 conveys the sheet from the upstream side (left side in FIG. 1) to the downstream side (right side in FIG. 1) at a substantially constant speed. To do.

  The printer 10 can print on a plurality of sizes of paper. In the present embodiment, the printer 10 can print sheets of various sizes up to a width W1 (maximum printable width: for example, A1 size (paper width 594 mm)) as shown in FIG. The printer 10 of the present embodiment is transported so that one end (upper end in the figure) of the direction (paper width direction: medium width direction) orthogonal to the paper transport direction is along the reference line BL, regardless of the paper size. It is comprised so that.

  The printer 10 is provided with a head 21 for ejecting ink that forms an image on a sheet. The head 21 is formed with a nozzle row 22 in which a plurality of nozzles 23 are arranged at predetermined intervals on a straight line. In the present embodiment, when the nozzle rows 22 are arranged along the paper width direction, the nozzles 23 can be ejected at a predetermined resolution (for example, 360 dpi) over the entire maximum printable width W1. It is an interval.

  In the present embodiment, the head 21 (nozzle row 22) is centered on a position O that is substantially the same as the center of the nozzle 23 at the end of the nozzle row 22 (in this embodiment, the uppermost nozzle 23). A head rotation shaft 18 that can be rotated is provided. By rotating the head 21 with the head rotation shaft 18, the angle of the head 21 (nozzle row 22) with respect to the paper width direction can be adjusted. As described above, when the head 21 is rotated around the head rotation shaft 18, printing at a resolution higher than the resolution (specific resolution) specific to the nozzle array 22 can be performed. Here, the resolution R1 (rotation resolution) that can be realized by rotating the head 21 (head row 22) is the angle formed by the head 21 with respect to the paper width direction (head rotation angle θ) and the inherent resolution of the nozzle row 22. R0 is represented by R1 = R0 / COSθ.

  For example, if the intrinsic resolution of the head array 22 is 360 dpi, when the resolution is 509 dpi, the head rotation angle θ is 45 degrees, and when the resolution is 720 dpi, the head rotation angle θ is 60 degrees. Is 1018 dpi, the head rotation angle θ is 69.295 degrees, and when the resolution is 1440 dpi, the head rotation angle θ is 75.5 degrees, which is Image formation with high resolution can be performed.

  When the head 21 is rotated, the length in the paper width direction occupied by all the nozzles 23 of the head 21 is shortened. As a result, the printable paper width is narrowed. Here, the printable paper width W2 at the time of rotation is expressed by W2 = W1 × COSθ by the head rotation angle θ and the maximum printable width W1 by the head 21. For example, in this embodiment, when the head rotation angle θ is 60 degrees and W1 is A1 size (594 mm), the printable paper width W2 is A3 size (297 mm).

  Next, a functional configuration of the image forming system according to the embodiment of the present invention will be described.

  FIG. 2 is a functional configuration diagram of the image forming system according to the embodiment of the present invention.

  The image forming system 1 includes a PC (Personal Computer) 2 and a printer 10.

  The PC 2 includes a memory 3, an input / output unit 4, a communication I / F unit 5, and a control unit 6.

  The memory 3 is used as an area for storing programs and data, or as a work area for storing data used for processing by the control unit 6. In the present embodiment, the memory 3 has a correspondence relationship between the resolution at the time of image formation and the angle (head rotation angle) of the nozzle row 22 with respect to the paper width direction when the resolution of the nozzle row 22 in the paper width direction is the resolution. Is stored as an angle management table 7 as an example of an angle storage means.

  FIG. 3 is a diagram showing an angle management table according to an embodiment of the present invention.

  The angle management table 7 stores a plurality of records each having a resolution field 7a, a head rotation angle θ field 7b, a maximum paper size field 7c, and a paper width field 7d.

  The resolution field 7a stores the resolution at the time of image formation. The head rotation angle θ field 7b stores the head rotation angle θ when an image can be formed with a corresponding resolution. The maximum paper size field 7c stores the maximum paper size that can form an image with the corresponding resolution. The paper width field 7d stores the paper width of the corresponding paper size.

  For example, in the third record, when an image is formed at a resolution of 720 dpi, the head rotation angle θ may be set to 60 degrees, and the maximum paper size in image formation at the resolution is A3, and the paper width Indicates 297 mm.

  Returning to the description of FIG. 2, the input / output unit 4 includes, for example, an input device such as a mouse and a keyboard, and an output device such as a display device. Output (display) information to the user.

  The communication I / F unit 5 mediates exchange of data related to printing between the PC 2 and the printer 10.

  The control unit 6 performs various controls of the units 3 to 5. The control unit 6 executes a program stored in the memory 3 to thereby execute an example of the resolution acquisition unit, the first image formation data generation unit, the second image formation data generation unit, the angle control unit, and the movement control unit. The printer driver unit 6a as a unit is configured.

  The printer driver unit 6a receives a designation of resolution for forming an image from the user via the input / output unit 4, and determines a head rotation angle θ for realizing the resolution. In the present embodiment, the printer driver unit 6 a determines the head rotation angle θ by acquiring the head rotation angle θ corresponding to the received resolution from the angle management table 7. The printer driver 6a notifies the printer 10 of the determined head rotation angle θ.

  In addition, the printer driver unit 6 a accepts designation of a paper size when forming an image from the user via the input / output unit 4. In the present embodiment, the printer driver unit 6 a accepts designation of a paper size within the maximum paper size corresponding to the resolution of the angle management table 7.

  Further, the printer driver unit 6a generates print data (dot data: first image formation data) having a determined resolution from the image data to be image formed. Further, the printer driver unit 6a performs correction for adjusting the supply timing of the dot data for image formation of each nozzle 23 based on the rotation angle of the head 21 with respect to the print data, so that the rotation correction print data ( Second image formation data) is generated. In addition, the printer driver unit 6 a transmits the generated rotation correction print data to the printer 10.

  The print data and rotation correction print data generated by the printer driver unit 6a will be described in detail with reference to the drawings.

  FIG. 4 is a diagram illustrating print data and rotation correction print data according to an embodiment of the present invention. FIG. 4A shows print data in a nozzle array having a predetermined resolution, and FIG. 4B shows rotation corrected print data obtained by rotating the print data shown in FIG. 4A.

  In order to print on the paper, the printer driver unit 6a first generates print data as follows, assuming that the nozzle rows having the determined resolution are aligned along the paper width direction. . That is, as shown in FIG. 4A, the printer driver unit 6a uses, based on the image data of the image to be formed and the determined resolution, the gradation of the ink ejected by each nozzle to form the image. Value data (gradation data) is generated.

  The print data shown in FIG. 4A is based on the assumption that the nozzles of the head nozzle row are aligned along the paper width direction, and when the head 21 is rotating (the nozzle row 22 is in the paper width direction). If the image is rotated, a desired image cannot be printed as it is. This is because the actual position of each nozzle 23 in the paper transport direction is different from the assumed position.

  Therefore, as shown in FIG. 4B, the printer driver unit 6 a determines the nozzle (for example, the uppermost nozzle) serving as a reference for the head 21 and the nozzle 23 for the gradation data of each nozzle of the print data in FIG. 4A. The gradation to be supplied to all nozzles while performing correction to add correction gradation data (correction data: gradation data indicating that printing is not performed) corresponding to the length of the deviation in the transport direction to the head (downstream side) Rotation correction print data is generated by performing correction to add the missing gradation data later so that the data length is the same. According to this, the length of the gradation data added to the head becomes longer as the nozzle 23 with a larger amount of deviation, that is, the lower nozzle 23 becomes. According to the rotation correction print data, an image having a desired resolution can be formed by the rotating head 21.

  Returning to the description of FIG. 2, the printer 10 includes a print controller 11, a head moving unit 17, and a head 21. The print controller 11 and the head 21 are connected by, for example, a flexible flat cable (FFC).

  The print controller 11 includes a communication I / F unit 12, a memory 13, a drive signal generation unit 14, a communication I / F unit 15, and a control unit 16.

  The communication I / F unit 12 mediates exchange of various data related to printing between the PC 2 and the print controller 11. The communication I / F unit 15 mediates exchange of data and signals between the head moving unit 17 and the head 21. For example, the communication I / F unit 15 mediates transmission of print data (bitmap data, dot pattern data) to the head 21.

  The memory 13 is used as an area for storing programs and data, or as a work area for storing data used for processing by the control unit 16. In the present embodiment, the memory 13 stores print data to be supplied to the head 21. The print data includes dot gradation data to be printed by the head 21 on the paper. In the present embodiment, the print data includes gradation data of each dot on the entire surface of the paper, and each gradation data is stored side by side in a predetermined order.

  The drive signal generation unit 14 generates a predetermined drive signal and outputs it to the head 21 via the communication I / F unit 15.

  The control unit 16 executes input / output control for the memory 13 and various processes. The control unit 16 includes a data storage processing unit 16a, a print data transfer processing unit 16b as an example of an image formation control unit, and a head movement control unit 16c as a part of an angle control unit.

  The data storage processing unit 16 a receives print data (rotation correction print data) from the PC 2 via the communication I / F 12 and stores it in the memory 13.

  The print data transfer unit 16 b takes out the print data from the memory 13 and transmits it to the head 21 via the communication I / F unit 15.

  When the head movement control unit 16c receives the rotation angle data indicating the rotation angle θ of the head 21 from the PC 2 via the communication I / F unit 12, the head 21 rotates the head rotation angle θ corresponding to the rotation angle data. Thus, the rotation (movement) of the head 21 by the head moving unit 17 is controlled.

  The head moving unit 17 rotates the head 21 around the head rotation shaft 18 so that the head 21 has a designated head rotation angle θ under the control of the head movement control unit 16c.

  The head 21 is provided with a piezoelectric vibrator (for example, a piezo element) 25 for controlling ejection of ink from each nozzle 23 at a position corresponding to each nozzle 23.

  The head 21 has a signal selection circuit 24. Based on the print data transmitted from the print data transfer processing unit 16 b via the communication I / F unit 15, the signal selection circuit 24 supplies the drive supplied from the drive signal generation unit 14 via the communication I / F unit 15. A signal is selected and supplied to each piezoelectric vibrator 25. As a result, each piezoelectric vibrator 25 expands and contracts according to the supplied drive signal, and ink is ejected from the nozzles 23 corresponding to the piezoelectric vibrator 25 according to the print data. As a result, a desired image is printed on the paper with the specified resolution.

  Next, a print preparation process for a PC according to an embodiment of the present invention will be described.

  FIG. 5 is a flowchart of PC print preparation processing according to an embodiment of the present invention.

  First, in the print preparation process, the printer driver unit 6a of the control unit 6 of the PC 2 receives designation of a resolution for forming an image from the user via the input / output unit 4, and determines that resolution as the resolution for image formation. (Step S1). Next, the printer driver 6a obtains the head rotation angle θ corresponding to the determined resolution from the angle management table 7, thereby determining the head rotation angle θ (step S2), and the rotation angle indicating the determined head rotation angle θ. Data is transmitted to the printer 10 (step S3).

  Next, the printer driver unit 6a receives designation of the paper size for image formation from the user via the input / output unit 4, and determines the received paper size as the paper size for image formation (step S4).

  Next, the printer driver 6a generates print data corresponding to the determined resolution based on the image data to be image formed (step S5).

  Next, the printer driver unit 6a generates rotation correction print data by performing correction for adjusting the gradation data supply timing of each nozzle 23 based on the head rotation angle with respect to the print data (step S6). .

  Next, the printer driver unit 6a transmits the generated rotation correction print data to the printer 10 (step S7).

  Next, the printing process of the printer 10 according to the embodiment of the present invention will be described.

  FIG. 6 is a flowchart of the printing process of the printer 10 according to an embodiment of the present invention.

  In the printing process, the head movement control unit 16c of the control unit 16 of the printer 10 receives the rotation angle data indicating the head rotation angle θ of the head 21 from the PC 2 via the communication I / F unit 12 (step S11). A control instruction to rotate the head 21 is transmitted to the head moving unit 17 so that the head 21 has the head rotation angle θ (step S12). As a result, the head moving unit 17 rotates the head 21 to the designated head rotation angle θ according to the control instruction of the head movement control unit 16c.

  Next, the data storage processing unit 16a of the control unit 16 receives print data (rotation correction print data) from the PC 2 via the communication I / F 12 and stores it in the memory 13 (step S13).

  Thereafter, the print data transfer processing unit 16b of the control unit 16 takes out the rotation correction print data from the memory 13 and transmits it to the head 21 via the communication I / F unit 15, and the drive signal generation unit 14 receives a predetermined drive signal. Is output to the head 21 via the communication I / F unit 15 to start printing (step S14).

  Accordingly, the signal selection circuit 24 of the head 21 causes the communication I / F unit 15 to be transmitted from the drive signal generation unit 14 based on the print data transmitted from the print data transfer processing unit 16b via the communication I / F unit 15. The drive signal supplied via the selection is selected and supplied to each piezoelectric vibrator 25. As a result, each piezoelectric vibrator 25 expands and contracts according to the supplied drive signal, and ink is ejected from the nozzles 23 corresponding to the piezoelectric vibrator 25 according to the print data. Therefore, a desired image is printed on the paper with a desired resolution.

  In this way, by rotating the nozzle row 22, printing with a desired resolution becomes possible, so printing with a higher resolution can be performed. Further, by forming the nozzle row 22 along the paper width direction, it is possible to form an image on a long paper.

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be applied to various other modes.

  For example, the printer according to the above embodiment can be configured as follows.

  FIG. 7 is a partial configuration diagram of a printer according to a first modification of the present invention. In addition, the same code | symbol is attached | subjected about the part similar to the said embodiment.

  In the printer 10 according to the first modified example, the sheet is conveyed so that the center of the sheet is positioned on the reference line BL at the substantially center of the belt 26.

  The head rotation shaft 18 is capable of rotating the head 21 around the position O of the nozzle 23 located in the vicinity of the reference line BL of the head 21. According to the printer 10, when the paper is transported based on the approximate center of the paper, the head 21 rotates around the position O in the vicinity of the reference line BL, so that the width of the printable paper can be ensured as long as possible. it can.

  Further, the printer according to the above embodiment can be further configured as follows.

  FIG. 8 is a partial configuration diagram of a printer according to a second modification of the present invention. In addition, the same code | symbol is attached | subjected about the part similar to the said embodiment.

  In the printer according to the second modification, in the printer according to the above-described embodiment, a plurality of heads 21 are provided in the paper width direction, and the positions of the nozzles 23 in each head 21 in the paper width direction are shifted. In this embodiment, when each head 21 is in a position along the paper width direction, the position of the nozzle 23 of each head 21 in the paper width direction is shifted by a half of the nozzle pitch, as indicated by a broken line in the figure. Yes. When these heads 21 are rotated at the same angle, the positions of the nozzles 23 of each head 21 in the paper width direction are shifted by half the interval between the nozzles 23 in the paper width direction.

  In this modification, the head movement control unit 16c rotates each head 21 at the same angle, and the resolution by the printer is double the resolution when a single head is rotated. can do.

  Further, the printer according to the above embodiment can be further configured as follows.

  FIG. 9 is a partial configuration diagram of a printer according to a third modification of the present invention. In addition, the same code | symbol is attached | subjected about the part similar to the said embodiment.

  The printer according to the third modification is provided with a plurality of heads 41 shorter than the head 21 of the above embodiment in the transport direction. At least one head 41 of the plurality of heads 41 according to the modification is rotatable in the paper width direction and is movable in the paper width direction along the linear movement member 31. In this embodiment, each head 41 can rotate in the paper width direction and can move in the paper width direction.

  In this modification, the positions of the nozzles 23 of the plurality of heads 41 that are rotated by the printer driver 6a (part of the movement control unit) to achieve the specified resolution are in a predetermined positional relationship (for example, At least one of the heads 41 is arranged so that the nozzles 23 of each head 41 are in a positional relationship that continues at a predetermined interval in the paper width direction (the paper width directions of some of the nozzles may overlap). The amount to be moved in the paper width direction is determined and notified to the head movement control unit 16c.

  The head movement control unit 16c (a part of the movement control means) rotates each head 41 so as to have a designated rotation angle and moves the head 41 in the paper width direction by the notified amount.

  According to the present modification, by preparing a plurality of heads 41 that are half the length of the head 21 of the above-described embodiment, the head 41 is not rotated, but is shifted and positioned in the paper width direction. Can be printed at a resolution unique to the head 41 on a paper having the same maximum print width W1, and printing at a resolution higher than the resolution unique to the head 41 can be performed by rotating the head 41. You can also. Thus, since the length of the head can be short, it is possible to easily create the head, and it is possible to reduce the cost for creating the head.

  In the third modification, the lengths of the plurality of heads 41 are not limited to the same length, and one may be shorter than the other. Further, although the resolutions of the plurality of heads 41 are the same, the resolutions of the heads 41 may be different from each other.

  In the above embodiment, the angle management table 7 is used to determine the rotation angle of the head 21 for realizing the specified resolution. However, the present invention is not limited to this, and the specified resolution is used. The rotation angle of the head 21 that realizes the above may be calculated.

  In the above embodiment, the print data is printed using the rotation correction print data corrected based on the rotation angle. However, the present invention is not limited to this, and the print data is corrected without correcting the print data. May be adjusted according to the amount of deviation of the position of each nozzle 23 in the paper conveyance direction.

  In the above embodiment, the PC 2 includes a function unit that determines the rotation angle of the head 21 and generates image data based on the rotation angle. However, the present invention is not limited to this, and the printer 10 A function unit that determines the rotation angle of the head 21 based on the resolution at the time of image formation and generates image data based on the rotation angle may be provided.

DESCRIPTION OF SYMBOLS 1 Image forming system 2 PC 3 Memory 4 Input / output part 5 Communication I / F part 6 Control part 6a Printer driver part 7 Angle management table 10 Line inkjet printer 11 Print controller 12 Communication I / F section, 13 memory, 14 drive signal generation section, 15 communication I / F section, 16 control section, 16a data storage processing section, 16b print data transfer processing section, 16c head movement control section, 17 head movement section, 18 head rotation Axis, 21 heads, 22 nozzle rows, 23 nozzles, 24 signal selection circuit, 25 piezoelectric vibrator, 26 belt, 31 linear movement member, 41 heads.

Claims (8)

In an image forming system having nozzle rows arranged in a direction crossing the conveying direction of the image forming medium,
Resolution acquisition means for acquiring resolution information at the time of image formation for the image to be imaged;
Angle control means for adjusting an angle of the nozzle row with respect to the medium width direction so that the resolution of the nozzle row in the medium width direction orthogonal to the transport direction becomes a resolution at the time of image formation indicated by the acquired information. ,
An image forming control unit configured to form an image on the image forming medium by the nozzle row having the angle adjusted; First image formation data generating means for generating first image formation data corresponding to the resolution at the time of image formation indicated by the acquired information based on the image data of the image to be formed;
A second image forming data generating unit configured to generate second image forming data for supplying the first image forming data to the nozzle row having the adjusted angle, based on the adjusted angle of the nozzle row; Have
2. The image forming system according to claim 1, wherein the image forming control unit forms an image on the image forming medium by the nozzle row having the angle adjusted based on the second image forming data. The image forming medium is transported with reference to one end of the image forming medium,
3. The image forming system according to claim 1, wherein the angle control unit adjusts the angle by rotating about an axis of the nozzle array near the one end of the image forming medium. The image forming medium is transported on the basis of the approximate center of the image forming medium in the medium width direction,
The image forming system according to claim 1, wherein the angle control unit adjusts the angle by rotating the nozzle row about an axis in the vicinity of the center of the image forming medium in the medium width direction. Stores the correspondence between the resolution at the time of image formation and the angle of the nozzle row with respect to the medium width direction such that the resolution of the nozzle row in the medium width direction orthogonal to the transport direction becomes the resolution at the time of image formation. An angle storage means;
The angle control unit acquires an angle of the nozzle row corresponding to the resolution at the time of image formation indicated by the information from the angle storage unit with respect to the medium width direction, and the angle obtained by acquiring the nozzle row is set to the angle. The image forming system according to claim 1, wherein the image forming system is adjusted. There are a plurality of nozzle rows arranged in a direction intersecting with the conveyance direction of the image forming medium, and the positions of the nozzles in each nozzle row in the direction intersecting with the conveyance direction are shifted and arranged.
The image forming system according to claim 1, wherein the angle control unit adjusts an angle of the plurality of nozzle rows with respect to the medium width direction. A plurality of nozzle rows arranged in a direction intersecting the conveyance direction of the image forming medium, and the at least one nozzle row is formed to be movable in a medium width direction perpendicular to the conveyance direction;
7. The apparatus according to claim 1, further comprising a movement control unit configured to move the at least one nozzle row in the medium width direction so as to have a predetermined positional relationship with other nozzle rows. Image forming system. In an image forming apparatus having nozzle rows arranged in a direction intersecting with a conveyance direction of an image forming medium,
Resolution acquisition means for acquiring resolution information at the time of image formation for the image to be imaged;
Angle control means for adjusting an angle of the nozzle row with respect to the medium width direction so that the resolution of the nozzle row in the medium width direction orthogonal to the transport direction becomes a resolution at the time of image formation indicated by the acquired information. ,
An image forming apparatus comprising: an image forming control unit configured to form an image on the image forming medium with the nozzle row having the adjusted angle.

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