JP2024014078A - Printer - Google Patents

Abstract

To provide a printer which can detect a case where there is a deviation in the positional relation between a lens array and a sensor after correction value setting without changing the configuration of a reading unit in the printer which executes shading correction by using a correction value.SOLUTION: A control unit of a printer prints an image on a medium, and acquires a first image obtained by reading the image printed on the medium by a reading unit during conveyance of the medium by a conveyance unit. The control unit acquires a second image obtained by reading a reference plate corresponding to a margin region by the reading unit during conveyance of the medium by the conveyance unit (S22). The control unit performs shading correction using the correction value set based on a reference image for each of the first image and the second image (S23). The control unit detects a case where there is a deviation in the positional relation between a lens array and a sensor after setting a correction value as positional deviation occurrence by detecting a reading abnormal value in a fixed cycle in the width direction over the entire second image corrected in S23 (S30).SELECTED DRAWING: Figure 7

Description

The present invention relates to a printing device.

A conventional image reading device includes an image reading section that reads a document, a shading correction data creation section, an image data processing section, and a reference position detection section. The image reading unit includes a lens array and reads the original. Marks are added to the lens array in advance at positions where the original is not transported. The reference position detection section detects the mark position from the data read by the image reading section. If the mark position detected by the reference position detection section is different from the mark position detected in advance, the image data processing section calculates the amount of difference between the detected mark position and the known mark position and the shading correction data. Based on this, the image data read by the image reading section is processed.

Japanese Patent Application Publication No. 2006-339839

A conventional image reading device detects whether the positional relationship between the lens array and the line sensor is misaligned based on marks provided on the lens array. Conventional image reading devices require processing of the image reading device because marks need to be provided on the lens array. It is usually difficult to process an image reading device in this way, leading to a significant increase in cost.

An object of the present invention is to detect, in a printing device that performs shading correction using correction values, a case where the positional relationship between the lens array and the sensor deviates after setting the correction values without changing the configuration of the reading unit. The purpose of the present invention is to provide a printing device that is of high quality.

A printing apparatus according to one aspect of the present invention includes: a conveyance section that conveys a long medium in a conveyance direction; a print head provided upstream of the conveyance section in the conveyance direction; a reference plate provided downstream of the print head and long in the width direction perpendicular to the transport direction; and a reading unit provided downstream of the print head in the transport direction, the reading unit having a predetermined relative position with respect to the reference plate. a reading unit including a lens array arranged at a predetermined area in the width direction and a sensor that detects light passing through the lens array; the transport unit; the print head; and a control unit that controls each of the print head and the transport unit, and the control unit controls the print head and the transport unit to perform a print control process of printing an image on the medium, and the transport unit transports the medium. a first process of acquiring a first image by reading the image printed on the medium with the width direction length shorter than the lens array with the reading unit; A second image is obtained by reading, with the reading unit, the reference plate corresponding to a surplus area of the predetermined area of the lens array excluding the area where the medium is conveyed in the width direction. For each of the second processing, the first image obtained in the first processing, and the second image obtained in the second processing, the reference plate is set based on the reference image read from the reference plate. After setting the correction value, the correction process performs shading correction using the correction value, and detects reading abnormal values at a constant period in the width direction over the entire second image corrected in the correction process. A detection process is executed to detect a shift in the positional relationship between the lens array and the sensor as an occurrence of positional shift. The printing device detection process detects when the positional relationship between the lens array and the sensor is misaligned after the correction value is set, without changing the configuration of the reading unit in the printing device that performs shading correction using the correction value. Contribute to what you do. The printing device can suppress the labor involved in processing lens arrays and the cost increase associated with processing, which is conventional.

1 is a perspective view of a printing device 1. FIG. 1 is a cross-sectional view showing the internal configuration of a printing device 1. FIG. 2 is an explanatory diagram of a medium M including a mount M1 and a plurality of labels M2, and an image G1 printed on the medium M. FIG. 1 is a block diagram showing the electrical configuration of a printing device 1. FIG. FIG. 3 is an explanatory diagram showing the electrical configuration of the control unit 30. It is a flowchart of main processing. It is a flowchart of inspection processing. Based on the process of converting the input gradation value D1 into an output gradation value D2 by gamma processing the input gradation value D1 using the second gamma correction table 94, and the adjacent difference D3 of the output gradation value D2, FIG. 6 is an explanatory diagram of a process for checking periodicity of abnormal reading values. By performing gamma processing on the input gradation value D1 using the second gamma correction table 95 of the modified example, the process of converting the input gradation value D1 into the output gradation value D4 and the abnormality detection based on the output gradation value D4 are performed. FIG. 3 is an explanatory diagram of a process for checking periodicity of read values.

A printing apparatus 1 according to an embodiment of the present invention will be described in order with reference to the drawings. The drawings referred to are used to explain technical features that can be adopted by the present invention, and the configuration of the device described is not intended to be limited thereto, but is merely an illustrative example. In the description of this embodiment, the lower left side, upper right side, lower right side, upper left side, upper side, and lower side of FIG. do.

The physical configuration of the printing apparatus 1 will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the printing device 1 includes a housing 2, a display section 3, and an operation section 4. The housing 2 has a front wall 24, a right wall 25, a rear wall 26, a lower wall 27, an upper wall 28, a left wall 29, and a cover 23. The housing 2 has a rectangular parallelepiped shape that is large enough to be placed on a tabletop. A discharge port 21 and an opening 22 are formed in the housing 2 . The discharge port 21 is formed in the front wall 24 of the housing 2 in a rectangular shape that is long in the left and right direction when viewed from the front. The opening 22 is formed in the rear lower part of the right wall 25 of the housing 2 and has a rectangular shape when viewed from the right side. The cover 23 is a rectangular plate when viewed from the right side, and can be rotated between a closed position in which the opening 22 is closed, as shown by a solid line in FIG. 1, and an open position in which the opening 22 is opened, as shown in a dashed line in FIG. It is possible to support the rear lower part of the right side of the housing 2. The display section 3 is provided at the upper right portion of the front surface of the front wall 24 of the housing 2, and displays images. The operating section 4 is provided below the display section 3 on the upper right front side of the front wall 24 of the housing 2, and is a plurality of buttons for inputting various instructions. The display section 3 and the operation section 4 are provided above the discharge port 21.

As shown in FIG. 2, the printing device 1 can be connected to a winding device 60, which will be described later, via a winding device connection section 68 and an external device connection section 69 provided on the front wall 24. The winding device connection portion 68 is provided at the lower right portion of the front wall 24 of the housing 2 . The winding device connection section 68 is a connector for electrically connecting to the winding device 60. The external device connection section 69 is provided below the winding device connection section 68 on the front wall 24 . The external device connection section 69 is a connector for electrically connecting to an external information device such as a PC.

The printing apparatus 1 includes a supply section 5 , a conveyance section 7 , 10 , 15 , 19 , 48 , a partition 55 , a tension applying section 8 , a medium detection section 53 , a print head 6 , a fixing unit 40 , and a standard inside a housing 2 . The plate 77 and the reading section 45 are accommodated therein. The printing device 1 is an inkjet printer that prints on a long medium M. The medium M is, for example, long and wound around a cylindrical paper tube K in the form of a roll. As shown in FIG. 3, the medium M of this embodiment includes a long mount M1 and a plurality of labels M2 attached to the mount M1. Each label M2 has a rectangular shape with a length FL in the longitudinal direction of the medium M, that is, a length in the transport direction F, and a width WL in the width direction W perpendicular to the longitudinal direction. A plurality of labels M2 are affixed to the mount M1 at regular intervals in the transport direction F at intervals J.

The supply unit 5 is provided in a space surrounded by the partition wall 55 and the rear wall 26 shown in FIG. 2, to the left of the cover 23 in the closed position shown by the solid line in FIG. 1, and at the rear lower part of the printing device 1. . The supply section 5 holds the roll R. The roll R is a roll of the medium M. The supply section 5 of this embodiment includes a shaft section 51 and a magazine 52. The shaft portion 51 extends in the left-right direction and is inserted into the paper tube K of the roll R. The magazine 52 is a U-shaped support stand when viewed from the front. The magazine 52 supports both left and right ends of the shaft portion 51 so that the shaft portion 51 can rotate around an axis extending in the left-right direction. The shaft portion 51 is removably supported by the magazine 52. Magazine 52 is removably supported by printing device 1 . When replacing the roll R, the user of the printing apparatus 1 places the cover 23 shown in FIG. 1 in the open position, takes out the magazine 52 shown in FIG. 2 from inside the housing 2, and performs the work of replacing the roll R. The partition wall 55 has a first wall portion 56 extending upward from the lower wall 27 of the housing 2 and a second wall portion 57 extending rearward from the upper end of the first wall portion 56, and defines the internal space of the housing 2. Participate. The second wall portion 57 is separated from the rear wall 26 of the housing 2 in the front-back direction.

The print head 6 prints an image on the medium M supplied from the supply unit 5 . The print head 6 of this embodiment is an inkjet head that includes a plurality of nozzles 70 that eject liquid ink 80 in the ejection direction, and prints an image on the medium M by ejecting the ink 80 from the plurality of nozzles 70. be. The ejection direction in this embodiment is downward, and the print head 6 is provided above the conveyance path Q of the medium M with a plurality of nozzles 70 facing downward. The conveyance path Q is a path along which the medium M is conveyed from being fed out from the supply unit 5 to being discharged from the discharge port 21 to the outside of the casing 2 . The ink 80 is supplied to the print head 6 from a tank 20 disposed inside the housing 2 via a tube (not shown).

The transport unit 7 transports the medium M in a transport direction F from the supply unit 5 toward the print head 6 and in a return direction B opposite to the transport direction F. The conveyance direction F is a direction along the conveyance path Q from the supply section 5 to the print head 6. The conveyance direction F is a direction that intersects the left-right direction, which is the extending direction of the rotation axis of the roll R, and is a direction that changes depending on the position on the conveyance path Q. The conveyance direction F from the supply section 5 to the tension applying section 8 is a direction that changes depending on the remaining amount of the medium M, and as shown in FIG. If it is the remaining amount value immediately after that, it is generally upward. The conveyance direction F from the tension applying section 8 to the discharge port 21 is generally forward. That is, in the printing apparatus 1, the conveyance path Q is bent at the portion where the medium M comes into contact with the tension applying unit 8, and the conveyance direction F changes from above to the front.

The conveyance section 7 is provided upstream in the conveyance direction F with respect to the print head 6 and downstream in the conveyance direction F with respect to the supply section 5 . That is, the conveyance section 7 is provided between the print head 6 and the supply section 5 on the conveyance path Q of the medium M. The conveyance unit 7 of this embodiment includes a pinch roller 71 that rotates around an axis extending in the left-right direction, and a conveyance roller 72. The pinch roller 71 and the conveyance roller 72 sandwich the medium M vertically and nip it. Perform transportation.

The medium detection unit 53 outputs the detection result of the medium M to the control unit 30 in FIG. The medium detection unit 53 of this embodiment is a transmission type sensor or a reflection type sensor. When the medium detecting section 53 is a reflective sensor, the medium detecting section 53 detects the leading edge of the label M2, for example, based on the difference in reflectance between the mount M1 and the label M2. If the mount M1 includes a plurality of holes arranged in a row at predetermined intervals in the conveyance direction F, and the medium detection section 53 is a transmission type sensor, the medium detection section 53 may, for example, Depending on whether or not the label M2 is detected, the tip of the label M2 is detected.

The transport unit 10 is provided upstream of the transport unit 7 in the transport direction F, and transports the medium M in the transport direction F and the return direction B. The conveyance unit 10 of this embodiment rotates the roll R held by the supply unit 5, conveys the medium M in the return direction B, and winds it around the roll R. The conveyance section 10 of this embodiment is removably engaged with the shaft section 51 of the supply section 5. The conveyance section 10 rotates the roll R held by the supply section 5 to convey the medium M in the conveyance direction F, and causes the medium M to be fed out from the roll R toward the print head 6 .

The tension applying unit 8 applies tension to the medium M between the supply unit 5 and the transport unit 7 on the transport path Q. The tension is tension that acts in a direction opposite to the traveling direction of the medium M. The tension applying unit 8 is disposed upstream of the conveying unit 7 in the conveying direction F and downstream of the conveying unit 10 in the conveying direction F, and contacts the medium M to move the medium M in a direction intersecting the conveying direction F. energize. That is, the tension applying section 8 is provided between the conveyance section 7 and the conveyance section 10 on the conveyance path Q. The tension applying section 8 is provided behind the conveyance section 7 and above the supply section 5 .

The transport unit 15 is provided below the print head 6 and downstream of the transport unit 7 in the transport direction F, and transports the medium M in the transport direction F. The conveying section 15 includes a driving roller 13, a driven roller 14, and an endless belt 16. The drive roller 13 and the driven roller 14 are spaced apart from each other in the front-rear direction. The endless belt 16 is stretched around the drive roller 13 and the driven roller 14. As the endless belt 16 rotates, the driven roller 14 rotates. The upper end of the outer circumferential surface of the endless belt 16 is approximately at the same vertical position as the portion where the medium M is nipped by the conveyance unit 7, and faces the plurality of nozzles 70 of the print head 6. The upper end of the outer peripheral surface of the endless belt 16 is in a state in which the medium M conveyed between the conveyance section 7 and the conveyance section 19 is attracted to the endless belt 16 from below by static electricity or negative pressure in the conveyance direction F. transport.

The fixing unit 40 is arranged downstream in the transport direction F with respect to the print head 6 and upstream with respect to the transport section 19 in the transport direction F. The fixing unit 40 is a halogen heater and includes a halogen lamp 41, a reflector 42, and a housing 43. An opening 44 is formed in the lower wall of the housing 43 along the left-right direction. The fixing unit 40 radiates infrared light through the opening 44 to heat the medium M passing directly under the opening 44 . As a result, the ink 80 ejected onto the medium M by the print head 6 is fixed on the medium M.

The transport unit 19 is provided downstream in the transport direction F with respect to the print head 6 and the fixing unit 40 and upstream in the transport direction F with respect to the reading unit 45 and the discharge port 21, and transports the medium M in the transport direction F and back. It is transported in direction B. The conveyance unit 19 includes a pinch roller 17 that rotates around an axis extending in the left-right direction, and a conveyance roller 18. The pinch roller 17 and the conveyance roller 18 sandwich the medium M vertically and perform nip conveyance.

The reference plate 77 is provided downstream of the print head 6 in the transport direction F, and has a plate shape that is long in the width direction W orthogonal to the transport direction F. The reference plate 77 is arranged below the conveyance path Q. The upper surface of the reference plate 77 has a color that serves as a reference when performing shading correction on the image read by the reading unit 45. The reference plate 77 is, for example, one of a white reference plate, a gray reference plate, and a black reference plate. The reference plate 77 of this embodiment is, for example, a white reference plate. The reference plate 77 is urged upward by a biasing member 78.

The reading unit 45 is provided downstream of the print head 6 and the transport unit 19 in the transport direction F, and upstream of the discharge port 21 in the transport direction F. The reading unit 45 is located directly above the transport path Q. The reading unit 45 optically reads the image printed on the surface of the label M2 of the medium M, and outputs an image signal indicating the read image. The reading unit 45 is, for example, a line image sensor such as a CIS (Contact Image Sensor) that is long in the width direction of the medium M, that is, in the left-right direction. The reading section 45 includes a lens array 75 and a sensor 76. The lens array 75 is arranged at a predetermined relative position with respect to the reference plate 77, and is arranged within a predetermined region R1 (see FIG. 3) in the width direction W. The length of the predetermined region R1 in the width direction W is longer than the length of the medium M in the width direction W. The lens array 75 has a plurality of cylindrical lenses, and each lens is arranged in the width direction W. Sensor 76 detects the light that has passed through lens array 75. The reading unit 45 outputs a gradation value according to the amount of light detected by the sensor 76.

The transport unit 48 is provided downstream in the transport direction F with respect to the reading unit 45 and upstream with respect to the discharge port 21 in the transport direction F, and transports the medium M in the transport direction F and the return direction B. The conveyance unit 48 includes a pinch roller 46 that rotates around an axis extending in the left-right direction, and a conveyance roller 47. The pinch roller 46 and the conveyance roller 47 sandwich the medium M vertically and perform nip conveyance.

The winding device 60 includes a cable 61 and a shaft portion 63. The cable 61 includes a plug 62 connectable to a winding device connection section 68 at its tip. When using the winding device 60, the user places the winding device 60 in front of the printing device 1 and inserts the plug 62 into the winding device connection portion 68. The winding device 60 is arranged downstream in the conveying direction F with respect to the reading section 45 while being electrically connected to the printing device 1 . The cable 61 transmits electric power supplied from the printing device 1 while being inserted into the winding device connection portion 68 . A core material around which the medium M is wound is attached to the shaft portion 63 . When the user causes the winding device 60 to wind up the medium M, the user pulls out the medium M from the discharge port 21 and fixes the pulled out medium M to the core material. The winding device 60 receives electric power transmitted from the printing device 1 and rotates the shaft portion 63 together with the core material. The medium M discharged from the discharge port 21 is wound around the core material. When the winding device 60 is connected to the printing device 1, the conveyance path Q of the medium M discharged from the discharge port 21 is bent, and the conveyance direction F changes from the front to the diagonally downward direction.

The electrical configuration of the printing apparatus 1 will be described with reference to FIG. 4. The printing device 1 includes a control section 30, a storage section 31 electrically connected to the control section 30, an operation section 4, a display section 3, drive sections 9, 11, 38, 39, 49, a print head 6, and a halogen lamp. 41, encoders 33 to 37, a medium detection section 53, a tension detection section 54, a reading section 45, a winding device connection section 68, and an external device connection section 69. The control unit 30 controls the printing apparatus 1 , and controls the print head 6 , the halogen lamp 41 , the drive units 9 , 11 , 38 , 39 , and 49 , and the display unit 3 . The storage unit 31 includes a ROM, a RAM, a flash memory, and the like that store various parameters and the like necessary when the control unit 30 executes various programs. As shown in FIG. 5, the control section 30 includes an image processing circuit group 90, a first gamma correction table 93, a second gamma correction table 94, a switching section 97, and a DRAM 96. The image processing circuit group 90 includes a plurality of circuits that process images output from the reading section 45. The image processing circuit group 90 of this embodiment includes a shading correction circuit 91 and a gamma correction circuit 92. The shading correction circuit 91 corrects the image using correction values created in advance by reading the reference plate 77 with the reading unit 45, and corrects the non-uniformity of the light amount of the light source in the image and each pixel of the sensor 76. This reduces the effects of variations in sensitivity. The switching unit 97 switches the gamma correction table referred to by the gamma correction circuit 92 to either the first gamma correction table 93 or the second gamma correction table 94. The DRAM 96 stores images that have passed through the image processing circuit group 90.

The drive section 9 rotationally drives the conveyance section 7 under the control of the control section 30 . The drive unit 11 rotates the transport unit 10 under the control of the control unit 30 . The drive unit 38 rotates the endless belt 16 of the conveyance unit 15 by rotating the drive roller 13 of the conveyance unit 15 under the control of the control unit 30 . The drive section 39 rotationally drives the conveyance section 19 under the control of the control section 30 . The drive section 49 rotationally drives the conveyance section 48 under the control of the control section 30 . Each of the drive units 9, 11, 38, 39, and 49 is, for example, a stepping motor capable of forward and reverse rotation. The encoder 33 inputs a value corresponding to the drive amount of the drive unit 9 to the control unit 30 . The encoder 34 inputs a value corresponding to the drive amount of the drive unit 11 to the control unit 30 . The encoder 35 inputs a value corresponding to the drive amount of the drive unit 38 to the control unit 30 . The encoder 36 inputs a value corresponding to the drive amount of the drive unit 39 to the control unit 30 . The encoder 37 inputs a value corresponding to the drive amount of the drive unit 49 to the control unit 30 . The tension detection section 54 outputs a detection result to the control section 30 according to the tension applied by the tension application section 8 to the medium M between the tension application section 8 and the conveyance section 7 . The winding device connection section 68 functions as an input/output interface with the winding device 60. The external device connection section 69 functions as an input/output interface with external information devices such as a PC.

With reference to FIGS. 6 to 8, the main processing executed by the control unit 30 of the printing apparatus 1 will be described using the specific example of FIG. 3. When the printing apparatus 1 is powered on, the control section 30 reads a program for performing main processing from the storage section 31 and executes the following processing. The main process of this embodiment is executed in cooperation with the winding device 60 via the winding device connection unit 68, and printing on a plurality of print areas may be executed continuously. In the following description, each processing step is abbreviated as "S". At the start of the main process, the medium M is sandwiched between the transport sections 7, and the attributes of the medium M are input into the printing apparatus 1 by the user. Based on the attributes of the medium M, the control unit 30 sets the area of the medium M to which the label M2 is attached as a print area. In the width direction W, the control unit 30 sets surplus regions R2 and R3 of the predetermined region R1 excluding the region where the medium M is transported. The surplus area R2 is an area on the left side of the area where the medium M is conveyed in the predetermined area R1. The surplus area R3 is an area on the right side of the area where the medium M is conveyed in the predetermined area R1. The length in the width direction W of the remainder region R2 in this embodiment is equal to the length in the width direction W of the remainder region R3.

As shown in FIG. 6, the control unit 30 acquires print data (S1). In a specific example, the user of the printing apparatus 1 operates the operation unit 4 to designate print data for consecutively printing images including identification codes, and then inputs an instruction to start printing. The identification code represents various information by a machine-readable arrangement of character strings, symbols, patterns, etc. The identification code may be, for example, a one-dimensional code or a two-dimensional code. The one-dimensional code may be, for example, a barcode. The two-dimensional code may be a QR code (registered trademark), VeriCode, CP code, AztecCode, PDF417, or the like. The control unit 30 acquires print data specified in the print start instruction.

The control unit 30 sets a correction value based on the reference image obtained by reading the reference plate 77 corresponding to the predetermined area R1 using the reading unit 45 before executing the print control process (S2). The correction value is used when performing shading correction. The control unit 30 sets each of a variable N representing the printing order and a variable E representing the reading order to 1 (S3). The control unit 30 controls the transport units 7, 10, 15, 19, and 48 to start transporting the medium M in the transport direction F (S4). When the printing device 1 performs main processing in cooperation with the winding device 60, the control unit 30 notifies the winding device 60 of the start of conveyance. After receiving the notification of the start of transport, the winding device 60 starts winding the medium M at a predetermined timing.

The control unit 30 detects the leading edge of the label M2 that is first in the printing order, which is adjacent to the leading edge of the medium M, that is, the leading edge of the printing area that is the first in the printing order, based on the detection result of the medium detection unit 53, The detection result is stored as the origin position (S5). When the printing device 1 performs the main processing in cooperation with the winding device 60, the processing in S5 may be omitted. The control unit 30 determines whether the Nth printing area from the leading edge of the medium M has reached the printing position (S6). The control unit 30 determines the Nth print area based on the drive amount of the drive units 9, 11, 38, 39, and 49 after detecting the origin position, the attributes of the medium M, and the distance from the origin position to the printing position. Determine whether the printing position has been reached. If the Nth printing area has not reached the printing position (S6: NO), the control unit 30 determines whether the Eth printing area has reached the reading position (S9). The control unit 30 determines the E-th print area based on the drive amounts of the drive units 9, 11, 38, 39, and 49 after the origin position is detected, the attributes of the medium M, and the distance from the origin position to the reading position. Determine whether the reading position has been reached. If the E-th print area has not reached the reading position (S9: NO), the control unit 30 returns the process to S6.

When the Nth print area has reached the print position (S6: YES), the control unit 30 controls the print head 6 and the transport units 7, 10, 15, 19, 48, and prints the print data acquired in S2. Accordingly, the Nth image G(N) including the identification code is printed in the Nth print area of the medium M (S7). The control unit 30 increments the variable N by 1 (S8) and returns the process to S6.

When the E-th printing area reaches the reading position (S9: YES), the control unit 30 controls the length of the width direction W while the conveyance units 7, 10, 15, 19, and 48 are conveying the medium M to the lens. A first image is obtained by reading an image printed on a medium M shorter than the array 75 using the reading unit 45 (S10). The shading correction circuit 91 of the control unit 30 performs shading correction on the first image acquired in S10 using the correction value set based on the reference image read from the reference plate 77 in S2 (S11). The gamma correction circuit 92 of the control unit 30 performs gamma correction on the first image after the shading correction using the first gamma correction table 93 (S12). The control unit 30 determines the print quality of the image G(N) including the identification code, for example, using the first image that has undergone shading correction and gamma correction.

The control unit 30 performs inspection processing (S13). In the inspection process, after the process of S10 is executed for the print area of interest among the plurality of print areas of the medium M, the process of S10 is executed for the print area that is next in the printing order of the print area of interest. executed before. As shown in FIG. 7, in the inspection process, the control unit 30 outputs a switching signal to the switching unit 97 to change the gamma correction table from the first gamma correction table 93 used in the process of S12 to the second gamma correction table. 94 (S21). The control unit 30 controls, while the conveyance units 7, 10, 15, 19, and 48 are conveying the medium M, the reference plate 77 corresponding to the surplus areas R2 and R3 in the width direction W is read by the reading unit 45. An image is acquired (S22). The remaining regions R2 and R3 are regions of the predetermined region R1 of the lens array 75 excluding the region where the medium M is transported. The shading correction circuit 91 of the control unit 30 performs shading correction on the second image acquired in S22 using the correction value set based on the reference image read from the reference plate 77 in S2 (S23).

The gamma correction circuit 92 of the control unit 30 performs gamma correction on the second image after the shading correction using the second gamma correction table 94 (S24). The second gamma correction table 94 is a table for converting input gradation values into output gradation values for each of the plurality of pixels constituting the second image. As schematically shown in FIG. 8, the second gamma correction table 94 converts the input gradation values D1 of the first range V1 including the gradation values when the reference plate 77 is normally read into the first range V1 It is set so that the change in the input gradation value D1 is converted into an emphasized gradation value which is an output gradation value D2 that emphasizes a change in the input gradation value D1. The input gradation value D1 and the output gradation value D2 are indicated by numerical values from 0 to 255. Since the reference plate 77 of this embodiment is a white reference plate, the gradation value is 255 when the reference plate 77 is read normally. The first range V1 is, for example, a range in which the input gradation value D1 is from 245 to 255. The emphasis tone value is, for example, a value that changes in a curved manner between 1 and 255. The second gamma correction table 94 fixes the input gradation value D1 of the second range V2 that is continuous with the first range V1 to be an output gradation value different from the emphasized gradation value, regardless of the input gradation value D1. Set to convert to value. The second range V2 is, for example, a range in which the input gradation value D1 is from 0 to 244. The fixed value is 0, for example. The control unit 30 applies the second gamma correction table 94 to the input tone value D1 to obtain an output tone value D2.

The control unit 30 calculates the adjacent difference D3 between the output gradation values D2 of each of the plurality of pixels of the second image subjected to the gamma correction in S24 (S25). The control unit 30 sets the value obtained by subtracting the output gradation value D2 of the (U+1)th pixel from the gradation value of the Uth pixel as the Uth adjacent difference D3. When U is 1, the adjacent difference D3 is 0. The control unit 30 determines that the maximum absolute value of the adjacent difference D3 is greater than or equal to the threshold (S26). The threshold value may be appropriately set in consideration of the output gradation value D2 obtained by applying the second gamma correction table 94. If the absolute value of the adjacent difference D3 is greater than or equal to the threshold value, this means that a reading abnormal value has been detected. If the maximum absolute value of the adjacent difference D3 is not greater than or equal to the threshold (S26: NO), the control unit 30 sets the test result to be normal (S29).

In the specific example of FIG. 8, the maximum absolute value of the adjacent difference D3 is 60, which is determined to be greater than or equal to the threshold (S26: YES). In this case, the control unit 30 checks whether there is a peak of the adjacent difference D3 at regular intervals in the width direction W over the entire second image (S27). The peak of the adjacent difference D3 is detected as a local maximum value or a local minimum value in the graph GF of changes in the adjacent difference D3 with respect to the pixel number. When the difference between the interval T1 between the peak P1 and the peak P2 and the interval T2 between the peak P2 and the peak P3 falls within a predetermined range, the control unit 30 calculates the adjacent difference at a constant period in the width direction W over the entire second image. Assume that there is a peak of D3. The control unit 30 determines whether there is periodicity based on the confirmation result in S27 (S28). If there is periodicity (S28: YES), the control unit 30 sets the occurrence of positional deviation in the inspection result (S30). If there is no periodicity (S28: NO), the control unit 30 sets occurrence of stain in the inspection result (S31). Next to any one of S29 to S31, the control unit 30 outputs a switching signal to the switching unit 97 to change the gamma correction table from the second gamma correction table 94 used in the process of S21 to the second gamma correction table 94 used in the process of S12. The first gamma correction table 93 is selected (S32). The control unit 30 ends the inspection process and returns the process to the main process.

The control unit 30 determines whether the test results set in the test process of S13 are normal (S14). When the test result is not found to be abnormal (S14: NO), the control unit 30 displays the test result on the display unit 3 and notifies an error (S16). If the inspection result shows no abnormality (S14: YES), the control unit 30 determines whether the variable E is the number of the last print area (S15). If the variable E is not the number of the last print area (S15: NO), the control unit 30 increments the variable E by 1 (S17), and returns the process to S6. If the variable E is the number of the last printing area (S15: YES), or after S16, the control unit 30 controls the transport units 7, 10, 15, 19, and 48 to move the medium M in the transport direction. Conveyance to F is stopped (S18). When the printing device 1 performs main processing in cooperation with the winding device 60, the control unit 30 notifies the winding device 60 to stop conveyance. After receiving the notification to stop conveyance, the winding device 60 stops winding the medium M at a predetermined timing. After executing the process of ejecting the medium M (S19), the control unit 30 ends the main process.

Referring to FIG. 9, the inspection process executed in the main process of the modified example will be described. The control unit 30 differs from the inspection process of the above embodiment in that the inspection process of the main process of the modified example omits S25 and the processes of S24, S26, and S27, and the other processes are different from the inspection process of the above embodiment. is the same as Below, each of the processes of S24, S26, and S27, which are different from those of the above embodiment, will be explained.

In S24 of the modified example, the gamma correction circuit 92 of the control unit 30 performs gamma correction on the second image after shading correction using a second gamma correction table 95 that is different from the second gamma correction table 94 of the above embodiment. (S24). The second gamma correction table 95 of the modified example converts the input gradation value D1 into an output gradation value of any one of a first output value, a second output value, and a third output value according to the input gradation value D1. Convert to D4. When the input gradation value D1 is an input gradation value in the first range V11 that includes the gradation value when the reference plate 77 is normally read, the control unit 30, based on the second gamma correction table 95, Convert the input tone value to a first output value. When the input gradation value D1 is a value within the second range V12 that is continuous with the first range, the control unit 30 determines that the input gradation value D1 is different from the first output value based on the second gamma correction table 95. Convert to mutually different second output values. If the input gradation value D1 is a value within the third range V13 that is continuous with the second range V12 but not continuous with the first range V11, the control unit 30 adjusts the input gradation value based on the second gamma correction table 95. The adjustment value D1 is converted into a third output value that is different from the first output value and the second output value. The first range V11 of the modification is a range in which the input gradation value D1 is 250 or more and 255 or less. The second range V12 is a range in which the input gradation value D1 is greater than or equal to 245 and less than 250. The second range V12 is set as a range that is determined to be an abnormal reading value. The third range V13 is a range in which the input gradation value D1 is greater than or equal to 0 and less than 245. The first output value is 255. The second output value is 200. The third output value is zero. Through the process of S24, the input gradation value D1 of the second image is converted into the output gradation value D4.

In S26 of the modified example, the control unit 30 determines whether the output gradation value D4 includes only the first output value (S26). If the output gradation value D4 includes only the first output value (S26: YES), the control unit 30 sets the inspection result to be normal (S29). When the output gradation value D4 is not only the first output value (S26: NO), the control unit 30 outputs the second output value at a constant period in the width direction W over the entire second image. Based on the detection, periodicity is confirmed (S27). The control unit 30 compares ranges T11, T13, and T15 of the second image in which the second output values are continuous with ranges T12 and T14 in which the first output values are continuous. Range T12 is located between ranges T11 and T13 of the second image. Range T14 is located between ranges T13 and T15 of the second image. The control unit 30 determines that there is periodicity when the ranges T11, T13, and T15 have the same or similar lengths, and the ranges T12 and T14 have the same or similar lengths. The length of the range is expressed, for example, by the number of pixels included in the range. Similar lengths refer to, for example, a case where the absolute value of the difference in length between two ranges is 1 or less. The criteria for determining similar lengths may be changed as appropriate. The subsequent processing is similar to the above embodiment. Based on the confirmation result in S27, the control unit 30 determines that a positional deviation has occurred when the second output value is detected at a constant period in the width direction W over the entire second image (S28: YES). Detect (S30).

In the above embodiment, the printing device 1, the print head 6, the control section 30, the reading section 45, the lens array 75, the sensor 76, and the reference plate 77 are the printing device, the print head, the control section, the reading section, and the reference plate 77 of the present invention, respectively. This is an example of a lens array, a sensor, and a reference plate. The conveyance units 7, 10, 15, 19, and 48 are examples of the conveyance units of the present invention. The process in S7 is an example of print control process. The process of S10 is an example of the first process of the present invention. The process of S22 is an example of the second process of the present invention. The processing in S11 and S23 is an example of the correction processing of the present invention. The processes of S27, S28, and S30 are an example of the detection process of the present invention. The process of S16 is an example of the notification control process of the present invention. The processing in S12 and S24 is an example of the gamma correction processing of the present invention. The process of S2 is an example of the correction value setting process of the present invention.

The printing apparatus 1 of the embodiment described above includes the conveyance sections 7, 10, 15, 19, 48, the print head 6, the reference plate 77, the reading section 45, and the control section 30. The transport units 7, 10, 15, 19, and 48 transport the elongated medium M in the transport direction F. The print head 6 is provided upstream of the transport units 19 and 48 in the transport direction F. The reference plate 77 is provided downstream of the print head 6 in the transport direction F, and is long in the width direction W orthogonal to the transport direction F. The reading unit 45 is provided downstream of the print head 6 in the transport direction F. The reading section 45 includes a lens array 75 and a sensor 76. The lens array 75 is arranged at a predetermined relative position with respect to the reference plate 77, and is arranged within a predetermined region R1 in the width direction W. Sensor 76 detects the light that has passed through lens array 75. The control unit 30 controls each of the transport units 7, 10, 15, 19, and 48, the print head 6, and the reading unit 45. The control unit 30 controls the print head 6 and the transport units 7, 10, 15, 19, and 48, and prints an image on the medium M (S4, S7). The control unit 30 causes the reading unit 45 to read an image printed on the medium M whose length in the width direction W is shorter than the lens array 75 while the conveyance units 7, 10, 15, 19, and 48 are conveying the medium M. A first image is obtained (S10). While the transport units 7, 10, 15, 19, and 48 are transporting the medium M, the control unit 30 removes the region where the medium M is transported from the predetermined region R1 of the lens array 75 in the width direction W. A second image is obtained by reading the reference plate 77 corresponding to the surplus areas R2 and R3 with the reading unit 45 (S22). The control unit 30 uses the correction value set based on the reference image read from the reference plate 77 for each of the first image acquired in the process of S10 and the second image acquired in the process of S22. Shading correction is performed (S11, S23). The control unit 30 detects reading abnormal values at a constant period in the width direction W over the entire second image corrected in S23, thereby detecting a deviation in the positional relationship between the lens array 75 and the sensor 76 after setting the correction value. If this happens, it is detected as the occurrence of positional deviation (S30). The processing in S30 of the printing apparatus 1 is such that the positional relationship between the lens array 75 and the sensor 76 is adjusted after setting the correction value without changing the configuration of the reading unit 45 in the printing apparatus 1 where shading correction is executed using the correction value. This contributes to detecting deviations. The printing apparatus 1 can suppress the effort required to process the lens array 75 and the cost increase associated with the process, which is conventional.

The control unit 30 of the printing device 1 successively executes the process for each of the plurality of print areas lined up in the transport direction F in S7. The process in S10 is executed for each of the plurality of print areas. The process of S22 is executed after the process of S10 is executed for the print area of interest among the plurality of print areas, and before the process of S10 is executed for the next print area of the print area of interest. Ru. The processing in S30 of the printing apparatus 1 contributes to reducing the processing load on the control unit 30, compared to the case where the processing in S22 is executed in parallel with the processing in S10.

In the printing apparatus 1, the remaining regions R2 and R3 are set for one side and the other side in the width direction W of the predetermined region R1 of the lens array 75, respectively. In S27 and S28, the control unit 30 adjusts the width of each of the surplus region R2 on one side in the width direction W and the surplus region R3 on the other side in the width direction W in the second image corrected in the process of S23. Occurrence of positional deviation is detected by detecting read abnormal values at a constant period in direction W (S30). The reading abnormal value in the above embodiment is a case where the absolute value of the adjacent difference D3 is less than the threshold value. When a positional shift occurs, reading abnormal values are detected at a constant period in the width direction W over the entire predetermined region R1 of the lens array 75. If an abnormal reading value is detected only on one side of the predetermined region R1 of the lens array 75 or only on the other side of the predetermined region R1 of the lens array 75, this does not mean that the positional relationship between the lens array 75 and the sensor 76 has shifted. Probability is high. The processing in S30 of the printing apparatus 1 can detect the occurrence of positional deviation more favorably than when surplus regions R2 and R3 are set only on one side and the other side of the predetermined region R1 of the lens array 75.

In the printing apparatus 1, the control unit 30 uses the gamma correction table 94 to convert the input gradation value D1 into an output gradation value D2 for each input gradation value D1 of a plurality of pixels constituting the second image. Gamma correction is performed (S24). Based on the gamma correction table 94, the control unit 30 converts the input gradation value D1 of the first range V1 including the gradation value when the reference plate 77 is normally read into the input gradation value D1 of the first range V1. is converted into an emphasized gradation value, which is an output gradation value D2 that emphasizes the change in . Based on the gamma correction table 94, the control unit 30 sets the input gradation value D1 of the second range V2 following the first range V1 to an output gradation value different from the emphasis gradation value, regardless of the input gradation value D1. Convert to a fixed value which is the value D2. The control unit 30 calculates the adjacent difference D3 between the output gradation values D2 of each of the plurality of pixels (S25). In the processing of S27 and S28, the control unit 30 detects the case where a peak of the adjacent difference D3 is detected at a constant period in the width direction W over the entire second image as a positional deviation occurrence (S30 ). After setting the correction value, the difference between the input gradation value D1 when the positional deviation occurs and the input gradation value D1 when the reference plate 77 is normally read generally falls within a predetermined range. By setting the first range V1 according to a predetermined range, the printing apparatus 1 can sensitively detect a change in the input gradation value D1 within the first range V1. On the other hand, since the second range V2 is an unnecessary range for detecting a shift in the positional relationship between the lens array 75 and the sensor 76, the printing apparatus 1 detects the peak of the adjacent difference D3 to It is possible to avoid erroneously detecting the input gradation value D1 in the range V2 as an abnormal value. Therefore, the printing apparatus 1 can accurately detect the occurrence of positional deviation with relatively simple processing.

The printing device 1 includes a display section 3 . When the occurrence of positional deviation is detected in the process of S30, the control unit 30 stops the execution of S7 and causes the display unit 3 to notify an error (S16, S18). The processing in S16 of the printing apparatus 1 contributes to preventing the processing in S7 from being continued in a state where positional deviation has occurred. The printing apparatus 1 can prompt the user of the printing apparatus 1 to take measures such as restoring the positional relationship between the lens array 75 and the sensor 76 or resetting the correction value.

In the printing apparatus 1, the control unit 30 performs gamma correction on the first image after shading correction using the first gamma correction table 93, and performs gamma correction on the second image after shading correction using a second gamma correction table 93 different from the first gamma correction table 93. Gamma correction processing is executed using the gamma correction table 94 (S12, S24). The control unit 30 detects the occurrence of positional deviation by detecting reading abnormal values at a constant period in the width direction W over the entire second image corrected in the processes of S23 and S24.

In the printing apparatus 1, a correction value is set based on the reference image obtained by reading the reference plate 77 corresponding to the predetermined region R1 using the reading unit 45 before executing the process in S7 (S2). By setting the correction value based on the reference image, the control unit 30 can set a correction value that can correct the entire predetermined region R1 including the print area in the width direction W.

In the printing apparatus 1 of the modified example, the control unit 30 creates a gamma correction table 95 that converts the input gradation value D1 into an output gradation value D4 for each input gradation value D1 of a plurality of pixels forming the second image. Perform gamma correction using . The gamma correction table 95 converts the input gradation value D1 of the first range V11, which includes the gradation value when the reference plate 77 is normally read, into a first output value, and The input gradation value D1 in the range V12 is converted into a second output value different from the first output value, and the input gradation value in the third range V13 is continuous with the second range V12 and not continuous with the first range V11. This is a table for converting the value D1 into a third output value that is different from the first output value and the second output value. In S27 and S28, the control unit 30 detects a case where the second output value is detected at a constant period in the width direction W over the entire second image as a positional deviation occurrence (S30). After setting the correction value, the difference between the input gradation value D1 when the positional deviation occurs and the input gradation value D1 when the reference plate 77 is normally read generally falls within a predetermined range. The printing device 1 of the modified example sets the range of input gradation values D1 when positional deviation occurs as a second range V12, and detects the second output value at a constant cycle in the width direction W over the entire second image. If this occurs, it is detected as a positional deviation occurring. Therefore, the printing apparatus 1 of the modified example can accurately detect the occurrence of positional deviation with relatively simple processing.

The printing apparatus of the present invention is not limited to the embodiments described above, and various changes may be made without departing from the gist of the present invention. For example, the following modifications may be added as appropriate. In addition to a printing device, the present invention may be implemented in other forms such as a printing method, a printing program, and a computer-readable medium on which the printing program is recorded.

The configuration of the medium M may be changed as appropriate; for example, it may be fanfold paper that is folded along perforations cut into the paper. The roll R may not have the paper tube K and may be wound into a roll so that it can be attached to the supply section 5. The configuration of the print head 6 may be changed as appropriate, and the type and number of inks may be changed as appropriate. The print head 6 may be an electrophotographic or thermosensitive thermal head. The fixing unit 40 may be omitted or the configuration may be changed depending on the printing method of the printing apparatus 1. The printing device 1 may include a cutting section configured to cut the medium M. The cutting unit may cut the medium M by a user's manual operation, or may cut the medium M automatically. At least one of the transport units 10 and 15, the transport unit 7, and the transport unit 48 may be omitted or the configuration may be changed as necessary. The reading unit 45 may be, for example, another device such as a CCD (Charge Coupled Devices). The printing device 1 may not be connectable to the winding device 60.

The program including the instructions for executing the main process shown in FIG. 6 may be stored in the storage device of the printing device 1 before the control unit 30 executes the program. Therefore, the program acquisition method, acquisition route, and device that stores the program may be changed as appropriate. The program executed by the control unit 30 may be received from another device via a cable or wireless communication, and may be stored in a storage device such as a flash memory. Other devices include, for example, a PC and a server connected via a network.

Each step of the main processing of the printing apparatus 1 is not limited to the example executed by the control unit 30, but may be partially or entirely executed by another electronic device (for example, ASIC). Each step of the main processing may be distributed and processed by multiple electronic devices, for example, multiple CPUs. The order of each step of the main processing can be changed, steps can be omitted, and additions can be made as necessary. A mode in which an operating system (OS) or the like running on the printing device 1 performs part or all of the main processing based on commands from the control unit 30 is also included within the scope of the present invention. For example, the following changes may be made to the main process as appropriate.

The control unit 30 may omit S24 and perform the detection process without performing gamma correction on the second image. In this case, the control unit 30, for example, extracts the case where the input gradation value is determined to be an abnormal reading value, and detects the occurrence of positional deviation based on whether the extracted abnormal reading value is detected at a certain period. You may. The control unit 30 may omit the processes of S12, S21, and S32, and the control unit 30 may not perform gamma correction on the first image. The control unit 30 does not have to alternately perform the first process in S10 and the second process in S22. For example, the control unit 30 may perform the second process after performing the process of S10 a predetermined number of times. The control unit 30 may perform the first process in S10 and the second process in S22 at the same time. A surplus area may be set only at one end in the width direction W of the predetermined area R1. When surplus regions R2 and R3 are set at both ends in the width direction W of the predetermined region R1, occurrence of positional deviation is detected using a second image obtained by reading only one of the surplus regions R2 and R3 in S22. Alternatively, the case where the remaining region R2 is to be inspected and the case where the remaining region R3 is to be to be inspected may be switched at a predetermined cycle. The first range, second range, and third range of input gradation values and output gradation values in the gamma correction tables 94 and 95 may be changed as appropriate. The control unit 30 may include a speaker instead of the display unit 3 and notify the occurrence of positional deviation by voice. The control unit 30 may omit the process of S16.

1: Printing device, 3: Display unit, 7, 10, 15, 19, 48: Conveyance unit, 30: Control unit, 45: Reading unit, 75: Lens array, 76: Sensor, 77: Reference plate, 93: No. 1st gamma correction table, 94: 2nd gamma correction table

Claims (8)

a conveyance unit that conveys the elongated medium in the conveyance direction;
a print head provided upstream of the transport section in the transport direction;
a reference plate provided downstream of the print head in the transport direction and long in a width direction perpendicular to the transport direction;
A reading section provided downstream of the print head in the transport direction,
a lens array arranged at a predetermined relative position with respect to the reference plate and arranged within a predetermined region in the width direction;
a reading unit comprising: a sensor that detects light passing through the lens array;
comprising a control unit that controls each of the transport unit, the print head, and the reading unit,
The control unit includes:
a print control process that controls the print head and the transport unit and prints an image on the medium;
a first process of acquiring a first image by reading, with the reading unit, the image printed on the medium whose length in the width direction is shorter than the lens array while the transport unit is transporting the medium;
While the conveyance unit is conveying the medium, the reading unit moves the reference plate corresponding to the remaining area of the predetermined area of the lens array excluding the area where the medium is conveyed in the width direction. a second process of acquiring a second image read by;
Shading using a correction value set based on a reference image read from the reference plate for each of the first image obtained in the first processing and the second image obtained in the second processing. A correction process that performs correction;
The positional relationship between the lens array and the sensor is shifted after the correction value is set by detecting reading abnormal values at a constant period in the width direction over the entire second image corrected by the correction process. A printing device characterized in that it performs a detection process of detecting a positional deviation as an occurrence of a positional deviation. The print control process is continuously executed for each of a plurality of print areas set on the medium and lined up in the transport direction,
The first process is performed on each of the plurality of print areas,
The second process is, after the first process for the print area of interest among the plurality of print areas is executed, the first process for a print area whose printing order is the next in the printing order of the print area of interest. 2. The printing apparatus according to claim 1, wherein the printing apparatus is executed before executing. The surplus area is set for each of the one side and the other side in the width direction of the predetermined area of the lens array,
In the detection process, the control unit determines each of the surplus area on the one side in the width direction and the surplus area on the other side in the width direction in the second image corrected in the correction process. 2. The printing apparatus according to claim 1, wherein the occurrence of the positional deviation is detected by detecting the reading abnormal value at the constant period in the width direction. The control unit includes:
A gamma correction table for converting the input gradation value into an output gradation value for each input gradation value of a plurality of pixels constituting the second image,
Converting a first range of input gradation values including gradation values when the reference plate is normally read into a first output value;
Converting input gradation values in a second range that is continuous to the first range into second output values that are different from the first output value,
converting input gradation values in a third range that is continuous with the second range but not continuous with the first range into a third output value that is different from the first output value and the second output value; Execute gamma correction processing to correct gamma using a correction table,
In the detection process, a case where the second output value is detected at the constant period in the width direction over the entire second image in the width direction is detected as the occurrence of the positional deviation. A printing device according to any one of claims 1 to 3. The control unit includes:
A gamma correction table for converting the input gradation value into an output gradation value for each input gradation value of a plurality of pixels constituting the second image,
An emphasized gradation value that is an output gradation value that emphasizes a change in the input gradation value of the first range by converting the input gradation value of the first range including the gradation value when the reference plate is read normally. Convert to value,
The gamma correction table is configured to convert an input gradation value in a second range that is continuous to the first range into a fixed value that is an output gradation value different from the emphasized gradation value, regardless of the input gradation value. Gamma correction processing that performs gamma correction using
a difference calculation process of calculating an adjacent difference between the output gradation values of each of the plurality of pixels;
further execute,
The detection process is characterized in that a case where a peak of the adjacent difference is detected at the constant period in the width direction over the entirety of the second image is detected as the occurrence of the positional deviation. A printing device according to any one of claims 1 to 3. Additionally equipped with a notification department,
The control unit includes:
4. If the occurrence of the positional shift is detected in the detection process, the print control process is stopped and a notification control process for causing the notification unit to notify an error is further executed. The printing device described in . The control unit performs gamma correction on the first image after the shading correction using a first gamma correction table, and performs gamma correction on the second image after the shading correction using a second gamma correction table different from the first gamma correction table. Execute gamma correction processing using the table,
The detection processing detects the occurrence of the positional deviation by detecting the reading abnormal value at the constant period in the width direction over the entire second image corrected by the correction processing and the gamma correction processing. 4. The printing apparatus according to claim 1, wherein the printing apparatus comprises: a printing apparatus according to claim 1; 2. A correction value setting process for setting the correction value based on the reference image obtained by reading the reference plate corresponding to the predetermined area using the reading unit before executing the print control process. 3. The printing device according to any one of 3.

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