JP2015066757A - Scan image correction method, scan correction inspection member, and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise accuracy of correction data obtained from a chart for adjustment by correcting distortion and an inclination resulting from a structure.SOLUTION: An inspection chart is arranged on a conveyance path so that grid lines of the inspection chart match horizontal lines and vertical lines of the conveyance path, the inspection chart is scanned by a scanning part, and a scan image of the inspection chart is acquired. Next, deviation amounts of grid lines of the scan image from the grid lines of the inspection chart are acquired, and the scan image by the scanning part of the chart for adjustment for adjusting printing is corrected by the acquired deviation amounts. Since the scan image of the chart for adjustment is corrected by the deviation amounts on which distortion and an inclination resulting from a structure are reflected, accuracy of correction data obtained from a correction image of the chart for adjustment can be raised.

Description

  The present invention relates to a scanning image correction method, a scanning correction inspection member, and a printing apparatus that scan an adjustment chart and perform correction at the time of printing based on the read image.

  Conventionally, as this type of method, there is a method in which an adjustment chart is printed on a printing sheet, the printed adjustment chart is read, and printing is adjusted based on the result (see, for example, Patent Document 1).

  In order to read the adjustment chart, a portion of the printing paper on which the adjustment chart is printed is adsorbed on an adsorption plate in an inclined posture. Reading is performed by the scanning unit. The scanning unit is disposed at an upper portion of the suction plate in a posture in which a long axis is directed in the width direction (horizontal direction) of the printing paper, and is configured to be freely rotatable, and to be suspended from the screw shaft. It consists of an attached scanner. Then, by rotating the screw shaft, the scanner is moved in the width direction to read the adjustment chart.

JP 2009-154408 A

However, the conventional example having such a configuration has the following problems.
That is, in the conventional apparatus, the central portion of the screw shaft with the long axis oriented in the horizontal direction is bent downward, so that the screw shaft is accurately aligned in the horizontal direction and orthogonal to the conveyance direction of the printing paper. It is difficult to place. For this reason, there is a problem in that the scan image of the adjustment chart read by the scanner is distorted or tilted, and the accuracy of correction data for print adjustment required based on this is reduced.

  The present invention has been made in view of such circumstances, and it is possible to improve the accuracy of correction data obtained from an adjustment chart by correcting distortion and inclination caused by the structure. It is an object to provide a method, a scanning correction inspection member, and a printing apparatus.

In order to achieve such an object, the present invention has the following configuration.
That is, the invention described in claim 1 is a scanning image correction method in a printing apparatus including a scanning unit that performs scanning in a direction orthogonal to the conveyance path of the print medium, the direction orthogonal to the conveyance path and A process of arranging an inspection chart in which a grid line composed of lines parallel to the transport path is drawn on the transport path so that the grid line coincides with the horizontal and vertical of the transport path; Scanning the chart with the scanning unit to obtain a scanned image of the inspection chart, obtaining a shift amount of the grid line of the scanned image with respect to the grid line of the inspection chart, and scanning with the scanning unit And a process of correcting a scan image of an adjustment chart for adjusting printing obtained by the above-described deviation amount.

  [Operation / Effect] According to the invention described in claim 1, the inspection chart is arranged on the conveyance path so that the grid lines of the inspection chart coincide with the horizontal and vertical of the conveyance path, and the inspection chart is arranged in the scanning unit. To obtain a scanned image of the inspection chart. Next, the deviation amount of the grid line of the scanning image with respect to the grid line of the inspection chart is acquired, and the scanning image by the scanning unit of the adjustment chart for adjusting printing is corrected with the acquired deviation amount. Since the scan image of the adjustment chart is corrected based on the shift amount reflecting the distortion and inclination caused by the structure, the accuracy of the correction data obtained from the correction image of the adjustment chart can be improved.

  Further, in the present invention, the step of arranging the opening formed at the intersection of the grid lines of the inspection chart arranged in a line in a direction orthogonal to the conveyance path, the conveyance of the inspection chart holding member The inspection chart is arranged on an end surface orthogonal to the path, and a line orthogonal to the conveyance path of the inspection chart is aligned with an end surface of the inspection chart holding member viewed through the opening. It is preferable that the holding member and the inspection chart are arranged in the transport path (Claim 2).

  Since the end surfaces of the inspection holding member visually recognized through the opening of the inspection chart are matched, the inspection chart and the inspection chart holding member can be aligned with high accuracy. Therefore, since the inspection chart fixed to the inspection holding member can be accurately arranged on the conveyance path, the scan image correction data for the horizontal and vertical directions of the conveyance path can be obtained with high accuracy. As a result, the shift amount can be obtained with high accuracy.

  In the present invention, it is preferable that the conveyance path is inclined.

  Since the scanning unit is provided on the inclined conveyance path for saving space, structural distortion and inclination occur. Accordingly, since the scan image of the adjustment chart is distorted or tilted, it is necessary to correct it by the shift amount.

  Further, in the present invention, the scanning unit is arranged such that a long axis is arranged in a direction orthogonal to the conveyance path, and a longitudinal direction is arranged along the conveyance path, and one end side thereof is the movement axis. And a combined scanner (claim 4).

  Since the screw shaft is bent to save space, the position of the scanner is structurally deviated from the design value. This structural shift is acquired as a shift amount and used for correction.

  In the present invention, it is preferable that the inspection chart is arranged by locking the inspection chart holding member with respect to a conveyance roller arranged in a direction orthogonal to the conveyance path. 5).

  The conveyance roller is assembled with high accuracy to the conveyance path. Therefore, the inspection chart can be accurately arranged with respect to the conveyance path by locking the inspection chart holding member to the conveyance roller.

  In the present invention, it is preferable that the inspection chart is attracted and fixed to the conveyance path.

  By fixing the inspection chart to the conveyance path by suction, a scanned image can be obtained with high accuracy.

  In the present invention, it is preferable that the deviation amount is stored as a correction table.

  Since the deviation amount is stored in the correction table, it can be easily read out, so that the adjustment chart can be easily corrected.

  In the present invention, it is preferable that the process of correcting with the shift amount is performed in a direction in which the scanning unit is bent.

  The scanned image read by the scanning unit is acquired by bending in the direction opposite to the direction in which the scanning unit is bent. Therefore, structural distortion can be canceled from the adjustment chart by correcting the amount of deviation in the bending direction.

  According to a ninth aspect of the present invention, there is provided a scanning correction inspection member used for correcting a scanned image by the scanning unit in a printing apparatus including a scanning unit that performs scanning in a direction orthogonal to the conveyance path of the print medium. An inspection chart plate on which an inspection chart is formed which includes a grid line having a direction perpendicular to the conveyance path and a direction parallel to the conveyance path; and a long axis in a direction orthogonal to the conveyance path. A holding member having the inspection chart plate mounted on the holding member, and arranged in the conveyance path so that the grid lines of the inspection chart coincide with the horizontal and vertical of the conveyance path. It is characterized by that.

  [Operation / Effect] According to the invention described in claim 9, in the state where the inspection chart plate is attached to the holding member, the conveyance path is such that the grid lines of the inspection chart coincide with the horizontal and vertical of the conveyance path. Placed in. To adjust printing by scanning the inspection chart in the scanning unit in this state, acquiring a scanning image of the inspection chart, and acquiring the amount of deviation of the grid line of the scanned image from the grid line of the inspection chart It is possible to improve the accuracy of the correction data obtained from the correction image of the adjustment chart by correcting the scan image of the adjustment chart.

  Further, in the present invention, the inspection chart plate has openings formed at intersections of grid lines arranged in a line in a direction orthogonal to the conveyance path, and a line orthogonal to the conveyance path of the inspection chart; It is preferable that the end surface of the holding member, which is visually recognized through the opening, be perpendicular to the conveyance path (Claim 10).

  Since the end surfaces of the inspection holding member visually recognized through the opening of the inspection chart plate are matched, the inspection chart and the holding member can be accurately aligned. Therefore, the deviation amount can be obtained with high accuracy.

  Moreover, in this invention, it is preferable that the said test | inspection chart board exhibits a sheet form (Claim 11).

  Since the inspection chart plate is sheet-like, the inspection chart can be accurately placed on the conveyance path.

  According to a twelfth aspect of the present invention, there is provided a printing apparatus including a scanning unit that performs scanning in a direction orthogonal to the conveyance path of the print medium, the printing unit printing an image on the print medium. The inspection chart in which a grid line composed of lines in a direction orthogonal to the transport path and a direction parallel to the transport path is drawn, the transport path so that the grid line coincides with the horizontal and vertical of the transport path The inspection chart is scanned by the scanning unit, a scanned image of the inspection chart is acquired, a shift amount of the grid line of the scan image with respect to the grid line of the inspection chart is acquired, and the shift Storage means for storing the amount, correction means for correcting the scan image of the adjustment chart for adjusting printing by the printing means obtained by scanning with the scanning unit, and correction by the correction means Adjustment Based on over preparative scanned image, it is characterized in that and a adjusting means for adjusting the printing by the printing means.

  [Operation / Effect] According to the invention described in claim 12, the correction means corrects the scanning image of the adjustment chart for adjusting the printing by the printing means, using the deviation amount stored in the storage means. Based on the corrected scanned image of the adjustment chart, the adjustment unit adjusts printing by the printing unit. Therefore, since the scan image of the adjustment chart is corrected based on the shift amount reflecting the distortion and inclination caused by the structure, the accuracy of the correction data obtained from the correction image of the adjustment chart can be improved. As a result, printing by the printing unit can be performed with high accuracy.

  According to the scanned image correction method of the present invention, the inspection chart is arranged on the conveyance path so that the grid lines of the inspection chart coincide with the horizontal and vertical of the conveyance path, and the inspection chart is scanned by the scanning unit. A scan image of the inspection chart is acquired. Next, the deviation amount of the grid line of the scanning image with respect to the grid line of the inspection chart is acquired, and the scanning image by the scanning unit of the adjustment chart for adjusting printing is corrected with the acquired deviation amount. Since the scan image of the adjustment chart is corrected based on the shift amount reflecting the distortion and inclination caused by the structure, the accuracy of the correction data obtained from the correction image of the adjustment chart can be improved.

1 is an overall view illustrating a schematic configuration of an inkjet printing apparatus according to an embodiment. It is a front view which shows schematic structure of a test | inspection part. It is a side view which shows schematic structure of a test | inspection part. It is a front view which shows schematic structure of a scanning correction | amendment inspection member. It is a partially enlarged view showing a state of alignment of the scanning correction inspection member. It is a side view which shows the state which attached the scanning correction | amendment test | inspection member to the suction plate. It is a flowchart which shows the operation | movement of a scanning image correction process. It is the schematic diagram which showed the example of the movement locus | trajectory at the time of scanning. It is a schematic diagram which shows an example of the acquired scanning image. It is a figure with which it uses for description of the process which extracts the line | wire of the direction orthogonal to a conveyance direction among grid lines. It is explanatory drawing of the process which acquires deviation | shift amount.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall view illustrating a schematic configuration of an ink jet printing apparatus according to an embodiment.

  The ink jet printing apparatus 1 according to this embodiment includes a paper feed unit 3, a printing unit 5, and a paper discharge unit 7.

  The paper feed unit 3 supplies a roll of continuous paper WP. The printing unit 5 is configured by, for example, an ink jet type and performs printing on the continuous paper WP. The paper discharge unit 7 winds up the continuous paper WP that has been printed on the front surface in a roll shape.

  The paper supply unit 3 holds the roll-shaped continuous paper WP so as to be rotatable about a horizontal axis, and unwinds and supplies the continuous paper WP to the printing unit 5. The paper discharge unit 7 winds the printed continuous paper WP around the horizontal axis.

  The printing unit 5 includes a driving roller 9 for taking in the continuous paper WP from the paper supply unit 3 on the upstream side. The continuous paper WP unwound from the paper feed unit 3 by the drive roller 9 is conveyed toward the downstream paper discharge unit 7 along the plurality of conveyance rollers 11. A drive roller 13 is disposed between the most downstream transport roller 11 and the paper discharge unit 7. The driving roller 13 feeds the continuous paper WP conveyed on the conveying roller 11 toward the paper discharge unit 7.

  The printing unit 5 includes a printing unit 15, a drying unit 17, and an inspection unit 19 in that order from the upstream side between the driving roller 9 and the driving roller 13. The drying unit 17 dries the portion printed by the printing unit 15. The inspection unit 19 inspects the printed portion for stains, omissions, and the like, and also reads an adjustment chart used for print adjustment, and reads an inspection chart described later.

  The printing unit 15 includes a print head 21 that ejects ink droplets that eject ink droplets. In general, a plurality of printing units 15 are arranged along the conveyance direction of the continuous paper WP. For example, four printing sections 15 are individually provided for black (K), cyan (C), magenta (M), and yellow (Y). However, in the following description, in order to facilitate understanding of the invention, it is assumed that only one printing unit 15 is provided. In addition, the printing unit 15 includes a plurality of print heads 21 that can perform printing without moving the printing region in the width direction of the continuous paper WP (the front side of the paper). That is, the printing unit 5 in this embodiment does not move the printing unit 15 in the direction orthogonal to the conveyance direction of the continuous paper WP for the main scanning, and moves the continuous paper WP in the sub-scanning direction while the position is fixed. Is printed on the continuous paper WP. Such a configuration is called a one-pass machine.

  The inspection unit 19 includes a guide roller 23, a lower roller 25, a suction plate 27, an upper roller 29, and a scanning unit 31.

  The guide roller 23 guides the continuous paper WP sent horizontally from the drying unit 17 downward. The lower roller 25 feeds the continuous paper WP that has been sent downward in an inclined posture, obliquely upward. The upper roller 29 guides the continuous paper WP sent from obliquely below in the horizontal direction.

  Here, the inspection unit 19 will be described with reference to FIGS. 2 and 3. FIG. 2 is a front view illustrating a schematic configuration of the inspection unit, and FIG. 3 is a side view illustrating a schematic configuration of the inspection unit.

  A suction plate 27 is disposed at a position corresponding to the conveyance path between the lower roller 25 and the upper roller 29. The suction plate 27 is disposed on the surface SP along a conveyance path along which the continuous paper WP is conveyed. In addition, the suction plate 27 is formed with a plurality of suction ports (not shown) that are sucked by a suction means (for example, a suction pump) (not shown) to become negative pressure over the entire surface SP.

  A scanning unit 31 is disposed at a position slightly separated from the surface SP of the suction plate 27. The scanning unit 31 includes a screw shaft 33, a rotation motor 35, and a scanner 37.

  The screw shaft 33 is disposed at an upper portion of the suction plate 27 in a posture in which the long axis is directed in the width direction of the continuous paper WP. The width direction here is the front side of the paper surface in FIG. 1, and is the left-right direction in FIG. The rotation motor 35 has a rotation shaft coupled to the screw shaft 33 and rotates the screw shaft 33 around the major axis. The scanner 37 is composed of an image sensor and is attached to the screw shaft 33 in a suspended posture. The scanner 37 is attached to the screw shaft 33 in a posture in which the reading surface is directed to the continuous paper WP side (surface SP side of the suction plate 27). The above-described screw shaft 33 is distorted so that the central portion bends downward because it is attached in a posture in which the long axis is directed in a direction orthogonal to the transport direction. Therefore, the scanned image obtained when scanned by the scanner 37 has distortion.

  The configuration for moving the scanner 37 is not limited to the screw shaft 33 (ball screw) described above. Instead of the screw shaft 33, for example, a desired method such as a combination of a linear motor, a rack and pinion, a linear guide and a cogged belt can be selected.

  The above-described transport control of the drive rollers 9, 13, ink droplet ejection control by the print head 21, drying processing by the drying unit 17, inspection processing by the inspection unit 19, and the like are comprehensively controlled by the control unit 39. . The control unit 39 is configured by a CPU, a memory, and the like. A storage unit 41 for storing information is connected to the control unit 39.

  The control unit 39 operates the print head 21 and the driving rollers 9 and 13 to print the adjustment chart on the continuous paper WP, causes the inspection unit 19 to read the adjustment chart, and prints based on the result. By adjusting the head 21 and the drive rollers 9 and 13, normal printing can be accurately performed on the continuous paper WP. Prior to the adjustment, as will be described later, the control unit 39 causes the inspection unit 19 to read the inspection chart and obtains a deviation amount based on the inspection chart. Next, the control unit 39 stores the obtained deviation amount in the storage unit 39 as a correction table, and corrects the adjustment chart based on the deviation amount of the storage unit 39 when the adjustment chart is read. Based on the corrected adjustment chart, the control unit 39 performs adjustment at the time of printing and performs printing with high accuracy.

  The printing unit 15 described above corresponds to “printing unit” in the present invention, the storage unit 41 corresponds to “storage unit” in the present invention, and the control unit 39 includes “correction unit” and “adjustment unit” in the present invention. It corresponds to.

  Here, with reference to FIG. 4 to FIG. 6, the scanning correction inspection member for obtaining the shift amount will be described. 4 is a front view showing a schematic configuration of the scanning correction inspection member, FIG. 5 is a partially enlarged view showing the alignment state of the scanning correction inspection member, and FIG. 6 is a scanning correction inspection member. It is a side view which shows the state which attached to the adsorption | suction board.

  The scanning correction inspection member 45 includes an inspection chart plate 47 and a holding member 49. The inspection chart plate 47 is a thin plate having a sheet shape, and is parallel to the horizontal line HL in the direction orthogonal to the conveyance path (the conveyance direction of the continuous paper WP and the width direction of the continuous paper WP) and the conveyance path. An inspection chart ES including a grid line having a vertical line VL in the (conveying direction of continuous paper WP) is drawn on the surface. The inspection chart plate 47 has openings 51 at each intersection of grid lines arranged in a line in a direction orthogonal to the conveyance path. In this example, an opening 51 is formed at each intersection of a horizontal line and a vertical line above the inspection chart plate 47. Each opening 51 penetrates from the front surface to the back surface of the inspection chart plate 47 and has a diameter that does not contact the adjacent opening 51. The holding member 49 has a rod shape having a long axis and is formed slightly longer than the width of the inspection chart plate 47. The holding member 49 has the same thickness from one end side to the other end side in the long axis.

  The scanning correction inspection member 45 has an inspection chart plate 47 attached to a holding member 49. The mounting of the inspection chart ES drawn on the inspection chart plate 47 and the end surface 49a in the direction orthogonal to the conveyance path among the end faces of the holding member 49 visually recognized through the opening 51 of the inspection chart plate 47. Of these, the line HL (horizontal line) orthogonal to the transport path is matched. The inspection chart plate 47 and the holding member 49 are integrally fixed by screwing or bonding.

  The scanning correction inspection member 45 configured as described above is attached as shown in FIG. FIG. 6 is a side view showing a state in which the scanning correction inspection member is attached to the suction plate.

  That is, the scanning correction inspection member 45 is locked in a posture in which the lower surface of the holding member 49 is in contact with the upper edge of the upper roller 29. Further, the horizontal line and the vertical line of the inspection chart ES of the inspection chart plate 47 are fixed in the posture of the scanning correction inspection member 45 by the suction of the suction plate 27 in a state where the horizontal line and the vertical line coincide with the horizontal and vertical of the transport path. Is done.

  Next, scanning image correction processing using the above-described scanning correction inspection member 45 will be described with reference to FIGS. FIG. 7 is a flowchart showing the operation of the scanned image correction process, FIG. 8 is a schematic diagram showing an example of a movement trajectory during scanning, and FIG. 9 is a schematic diagram showing an example of the acquired scanned image. FIG. 10 is a diagram for explaining a process of extracting a line in a direction orthogonal to the transport direction from among the grid lines, and FIG. 11 is an explanatory diagram of a process for acquiring a deviation amount.

Step S1
In the inkjet printing apparatus 1, the scanning correction inspection member 45 is attached to the suction plate 27 as shown in FIG. 6 with the continuous paper WP removed.

Step S2
The control unit 39 operates the inspection unit 19 to scan the inspection chart ES. Thereby, the control unit 39 acquires a scanned image of the inspection chart ES from the inspection unit 19. At this time, for the reason described above, the scanner 37 scans by drawing a locus as shown by a dotted line in FIG. In this example, since the screw shaft 33 is bent downward, the movement locus of the scanner 37 is also bent downward.

  As a result, the scanned image is as shown in FIG. That is, the inspection chart ES in the scanned image is distorted so that the horizontal line HL of the inspection chart ES of the inspection chart plate 47 is curved upward like the horizontal line HL−. This is because the scanner 37 moves along a locus bent downward, so that the horizontal line HL at the same position is gradually read by the upper pixel as the scanner 37 moves to the center.

Step S3
The control unit 39 identifies one line area in the width direction of the continuous paper WP from the acquired scanned image of the inspection chart ES. Specifically, a process of extracting a region including only one horizontal line HL- from a plurality of horizontal lines HL- is performed.

  Specifically, the scanned image is averaged in the horizontal direction to perform binarization processing. Then, only one line area SA is specified from the low density area (part indicated by a two-dot chain line in FIG. 10). When the binarization process is performed by averaging in the horizontal direction, the density of a region where the horizontal line HL− exists is low, so that the line region SA where the curved horizontal line HL− exists can be specified. Here, the topmost line area SA is selected from a plurality of areas with low density, but another area may be selected instead. Further, a plurality of line areas SA may be specified, the correction tables obtained from the respective line areas SA may be averaged, and stored in the storage unit 41 as one correction table.

Step S4
The control unit 39 acquires the shift amount based on the line area SA. Specifically, as shown in FIG. 11, the binarization process is performed on the line area SA, and the low-density portion (horizontal line HL−) is used with reference to the leftmost pixel position (x = 0). A shift amount in the transport direction of a portion having a low density at each pixel position in a direction orthogonal to the transport direction is obtained over the width direction of the transport path. The deviation amounts of the positions corresponding to the pixels of the scanner 37 in the width direction of the continuous paper WP thus obtained are stored in the storage unit 41 as a correction table for each position corresponding to the pixels.

  After the deviation amount is stored in the storage unit 41 as the correction table as described above, the inkjet printing apparatus 1 performs printing adjustment as follows, for example.

  First, an adjustment chart for adjusting printing is drawn by the printing unit 15 while supplying the continuous paper WP to the printing unit 5. This adjustment chart includes, for example, a figure that can read a positional deviation amount (also referred to as a step deviation) in the transport direction by the print head 21. Thereafter, the adjustment chart is sent to the inspection unit 19, and the adjustment chart is scanned by the scanning unit 31 in a state where the adjustment chart is adsorbed by the adsorption plate 27. The control unit 39 refers to the correction table in the storage unit 41 and corrects the scanned image of the adjustment chart with the shift amount. Thereby, the distortion resulting from the bending of the screw shaft 33 is removed from the scanned image of the adjustment chart. Specifically, the correction can be performed by drawing each shift amount of the correction table in the same direction as the bending of the screw shaft 33. The control unit 39 obtains correction data for the ejection timing of the ink droplets from the printing unit 15 based on the corrected scanning image of the adjustment chart. Then, while correcting with the correction data, the printed product 15 is printed by the printing unit 15.

  According to the present embodiment, the control unit 39 corrects the scan image of the adjustment chart for adjusting the printing by the printing unit 15 using the deviation amount stored in the storage unit 41. Based on the corrected scanning image of the adjustment chart, the control unit 39 adjusts the printing by the printing unit 15. Therefore, since the scanning image of the adjustment chart is corrected by the amount of deviation reflecting the distortion and inclination caused by the structure of the screw shaft 33, the accuracy of the correction data obtained from the correction image of the adjustment chart can be improved. . As a result, printing by the printing unit 15 can be performed with high accuracy.

  The present invention is not limited to the above embodiment, and can be modified as follows.

  (1) In the above-described embodiment, the case where the deflection of the horizontal line HL in the conveyance direction is obtained as a deviation amount has been described as an example. However, the present invention can also be applied to the case where the deflection of the vertical line VL in the direction orthogonal to the transport direction is obtained as the shift amount. That is, when the screw shaft 33 is attached with an inclination or when the scanner 37 is attached with an inclination with respect to the screw shaft 33, the grid lines are acquired as a parallelogram scanning image. It will be. From the parallelogram scan image, the degree of inclination may be obtained for each pixel position of the scanner located in the transport direction and stored in the correction table as a deviation amount.

  (2) In the above-described embodiments, the ink jet printing apparatus 1 including the ink jet printing unit 15 has been described as an example. However, the present invention can be applied to apparatuses other than the ink jet printing apparatus.

  (3) In the above-described embodiment, the scanning correction inspection member 45 is configured as shown in FIGS. 4 and 5, but the present invention is not limited to such configuration. That is, when the assembly accuracy of the holding member 49 and the inspection chart plate 47 is sufficiently obtained, the inspection chart plate 47 does not necessarily include the opening 51.

WP: Continuous paper 1 ... Inkjet printer 5 ... Printing unit 15 ... Printing unit 19 ... Inspection unit 21 ... Printing head 23 ... Guide roller 25 ... Lower roller 27 ... Suction plate 29 ... Upper roller 31 ... Scanning unit 33 ... Screw shaft 35 ... Rotary motor 37 ... Scanner 39 ... Control part 41 ... Storage part 45 ... Scanning correction inspection member 47 ... Inspection chart plate 49 ... Holding member HL ... Horizontal line VL ... Vertical line ES ... Inspection chart 51 ... Opening 49a ... End face HL -... Horizontal line in scanned image SA ... Line area

Claims (12)

A scanning image correction method in a printing apparatus including a scanning unit that performs scanning in a direction orthogonal to a conveyance path of a print medium,
An inspection chart in which a grid line composed of lines in a direction perpendicular to the transport path and a direction parallel to the transport path is drawn on the transport path so that the grid line coincides with the horizontal and vertical directions of the transport path. The process of placing,
Scanning the inspection chart with the scanning unit to obtain a scanned image of the inspection chart;
Obtaining a shift amount of the grid line of the scanned image with respect to the grid line of the inspection chart;
A process of correcting a scan image of an adjustment chart for adjusting printing obtained by scanning with the scanning unit with the shift amount;
A scanning image correction method comprising: The scanning image correction method according to claim 1,
The step of arranging the openings formed at the intersections of the grid lines of the inspection chart arranged in a line in a direction orthogonal to the conveyance path on the end surface of the inspection chart holding member orthogonal to the conveyance path The inspection chart holding member and the inspection chart are arranged in a state in which the line orthogonal to the conveyance path of the inspection chart is aligned with the end surface of the inspection chart holding member visually recognized through the opening. A scanning image correction method, comprising: arranging a chart on the conveyance path. In the scanning image correction method according to claim 1 or 2,
The scanning image correction method, wherein the conveyance path is inclined. In the scanning image correction method according to any one of claims 1 to 3,
The scanning unit includes a moving axis having a long axis arranged in a direction orthogonal to the conveying path, a scanner having a longitudinal direction arranged along the conveying path, and one end side coupled to the moving axis, A scanning image correction method comprising: The scanning image correction method according to claim 2,
The scanning image correction method, wherein the inspection chart is arranged by engaging the inspection chart holding member with respect to a conveyance roller arranged in a direction orthogonal to the conveyance path. In the scanning image correction method according to any one of claims 1 to 5,
The method for correcting a scanned image, wherein the inspection chart is adsorbed and fixed to the conveyance path. In the scanning image correction method according to any one of claims 1 to 6,
The method of correcting a scanned image, wherein the deviation amount is stored as a correction table. In the scanning image correction method according to any one of claims 1 to 7,
The scanning image correction method according to claim 1, wherein the correction using the shift amount is performed in a direction in which the scanning unit is bent. A scanning correction inspection member used for scanning image correction by the scanning unit in a printing apparatus including a scanning unit that performs scanning in a direction orthogonal to the conveyance path of the print medium,
An inspection chart board on which an inspection chart composed of grid lines having lines in a direction orthogonal to the conveyance path and a direction parallel to the conveyance path;
A holding member having a long axis in a direction orthogonal to the conveyance path;
With
The scanning correction, wherein the inspection chart plate is attached to the holding member, and the grid of the inspection chart is arranged on the conveyance path so as to coincide with the horizontal and vertical of the conveyance path. Inspection member. In the scanning correction inspection member according to claim 9,
The inspection chart plate has an opening formed at the intersection of the grid lines arranged in a line in a direction perpendicular to the conveyance path,
A scanning correction inspection member, wherein a line orthogonal to the conveyance path of the inspection chart and an end surface of the holding member which are visible through the opening are orthogonal to the conveyance path. In the scanning correction inspection member according to claim 9 or 10,
The scanning correction inspection member, wherein the inspection chart plate has a sheet shape. A printing apparatus including a scanning unit that performs scanning in a direction orthogonal to a conveyance path of a print medium,
Printing means for printing an image on the print medium;
An inspection chart in which a grid line composed of lines in a direction perpendicular to the transport path and a direction parallel to the transport path is drawn on the transport path so that the grid line coincides with the horizontal and vertical directions of the transport path. Arranging, scanning the inspection chart with the scanning unit, obtaining a scanned image of the inspection chart, obtaining a shift amount of a grid line of the scan image with respect to a grid line of the inspection chart, and a shift amount thereof Storage means for storing
Correction means for correcting a scan image of an adjustment chart for adjusting printing by the printing means, obtained by scanning with the scanning unit, with the shift amount;
An adjustment unit that adjusts printing by the printing unit based on the scanned image of the adjustment chart corrected by the correction unit;
A printing apparatus comprising:

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