CN112829467B - Continuous image-text splicing method for ink-jet printer - Google Patents
Continuous image-text splicing method for ink-jet printer Download PDFInfo
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- CN112829467B CN112829467B CN202110141382.XA CN202110141382A CN112829467B CN 112829467 B CN112829467 B CN 112829467B CN 202110141382 A CN202110141382 A CN 202110141382A CN 112829467 B CN112829467 B CN 112829467B
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- 238000000034 method Methods 0.000 title claims abstract description 85
- 238000007639 printing Methods 0.000 claims abstract description 220
- 239000007921 spray Substances 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 238000012937 correction Methods 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 239000000976 ink Substances 0.000 description 39
- 230000033001 locomotion Effects 0.000 description 24
- 238000001514 detection method Methods 0.000 description 20
- 238000007641 inkjet printing Methods 0.000 description 18
- 238000003384 imaging method Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 238000007592 spray painting technique Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
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- 239000003086 colorant Substances 0.000 description 1
- 238000002508 contact lithography Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
Abstract
The invention provides a continuous image-text splicing method for an ink-jet printer, which comprises the following steps: the printing trolley is provided with a printing spray head which moves back and forth along a first direction along with the printing trolley; the paper feeding mechanism intermittently conveys the medium along the first direction, and conveys the paper feeding distance of a tabletop each time; the control system controls the work of the printing trolley, the paper feeding mechanism and the printing spray head; and installing a camera at the side of the printing trolley, pre-printing marks on the medium, pre-calculating the theoretical position of the marks by software, detecting and feeding back the actual position of the marks on the medium by the camera in the actual printing process, performing parameter calculation by the software according to the actual position and the theoretical position of the marks, and printing images and texts matched with the actual mark position by utilizing a parameter correction control system. When the method is used for printing coiled material media with continuous graphics and texts, the position error of the media can be corrected, and accurate position printing is realized for each page of graphics and texts to be printed on each desktop.
Description
Technical Field
The invention relates to a continuous image-text splicing method for an ink-jet printer, in particular to a continuous image-text splicing method for an ink-jet printer for intermittently feeding coiled material printing media.
Background
Inkjet printing refers to a technique in which ink droplets are ejected onto a printing medium through a head to obtain a printed image or text. The technology is non-contact printing, has the advantages of high printing speed, small pollution, suitability for various printing media and the like, and is widely applied to the field of industrial application. The ink jet printing is divided into Scanning type (Scanning) ink jet printing and one-time paper feeding imaging (Onepass) ink jet printing according to the movement modes of the printing trolley and the printing medium, wherein the Scanning type ink jet printing comprises two types of roll-to-roll type ink jet printing and platform type ink jet printing, the printing trolley moves back and forth along a guide rail beam relative to the printing medium in the ink jet printing process, the printing medium moves in a stepping mode along the direction perpendicular to the movement direction of the printing trolley, and the guide rail beam on which the printing trolley is arranged is stationary; the platform type ink-jet printing has two conditions in the ink-jet printing process, one is that the guide rail beam is motionless in the ink-jet printing process, the printing trolley moves back and forth along the guide rail beam, and the printing platform moves in a stepping manner along the direction perpendicular to the moving direction of the printing trolley; still another is that the printing platform is stationary, the printing trolley moves back and forth relative to the printing medium along the guide rail beam, and the guide rail beam moves in a direction perpendicular to the guide rail beam in a stepping manner so as to drive the printing trolley to move in a direction perpendicular to the guide rail beam in a stepping manner. While one-pass imaging (Onepass) inkjet printing in which the print carriage is stationary and the print medium moves unidirectionally at high speed. The printing precision and the printing width of the spray heads are required to be high by adopting one-time paper feeding imaging ink-jet printing, the printing precision of the spray heads is required to be the printing precision of images, the printing width of the spray heads is required to be the printing width of images, the high precision is obtained by splicing the spray heads and the wider printing width is obtained by connecting the spray heads in series, but the quantity of the spray heads is necessarily increased, and the cost of the printer is necessarily increased no matter the high-precision spray heads are used or the high printing precision is obtained by a plurality of spray heads.
In the conventional one-pass imaging (Onepass) inkjet printing process, a machine can be designed to integrate the scanning printing and one-pass imaging printing modes, so as to meet the requirements of a multifunctional multi-mode integrated printer, specifically: the medium to be printed is coiled material medium, and is conveyed in a roll-to-roll mode in a paper feeding device, unlike the one-time paper feeding imaging mode, the medium is conveyed in an intermittent mode in the medium conveying mode, namely, the length distance of a desktop is conveyed each time, then paper feeding is stopped, the printing trolley carries out image-text spray painting on the medium to be printed with the length of the desktop in a scanning printing mode, after the image-text of the desktop is sprayed, the conveying device continues to convey the medium to be printed with the length of the next desktop, the printing trolley continues to carry out image-text spray painting on the medium of the desktop, because the pictures and texts of the two desktops are continuous pictures and texts, the picture and text information of the two desktops must be spliced well, but because of factors such as errors of a pressure sensor in the actual process, errors of paper tension in the printing process, and errors of a paper feeding device in the transmission, the distance of stepping one desktop each time is not completely consistent, and at the moment, the pictures and texts of the front and rear desktops can not be spliced well after the same inking printing is performed each time along the preset printing origin coordinates. Therefore, a method is needed to print the graphics on different desktops to the actually needed positions, so that the images of each desktop can be spliced seamlessly and continuously.
In practical applications of printing some variable data, such as notes, a plurality of small pages can be printed on each desktop, the printing information on each page is different, identification information is printed on the medium before printing, in the same way, in the transmission process, the medium is stretched due to pressure sensor errors for detecting the paper feeding speed, changes of the paper tension in the printing process and the like, in addition, the paper feeding device easily generates deviation in the transmission process, if each desktop printing is performed by means of the ink jet at the same position by means of coordinates preset by software, errors are likely to be generated, so that the printed image deviates from the due printing position, and the visual effect is affected. The marks may be printed in advance for subsequent cutting, or may be graphic information for positioning or preprocessing each page of printing, so how to use the existing marks to solve the problem that the printing position deviation of each page of continuous graphic appears becomes a problem to be solved.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a continuous image-text splicing method for an ink-jet printer, which is applied to coiled material medium printing and can realize high-resolution and accurate printing of continuous image-text.
In order to achieve the purpose, the invention provides a continuous image-text splicing method for an ink-jet printer, which comprises the following steps: the printing trolley is provided with a printing spray head which moves back and forth along a first direction along with the printing trolley; the paper feeding mechanism intermittently conveys the medium along the first direction, and conveys the paper feeding distance of a tabletop at each time; the control system controls the work of the printing trolley, the paper feeding mechanism and the printing spray head; the method is characterized in that a camera is arranged on the side of a printing trolley, a mark is printed on a medium in advance, software calculates the theoretical position of the mark in advance, in the actual printing process, the camera detects and feeds back the actual position of the mark on the medium, the software calculates parameters according to the actual position and the theoretical position of the mark, and a picture and text matched with the actual mark position is printed by utilizing the parameter correction control system.
In the continuous image-text splicing method, the camera can carry out error correction on offset in the first direction, offset in the second direction, stretching in the first direction and angle deflection on the printed image-text.
In the continuous image-text splicing method, the mark is a rectangular mark, a circular mark or a marking line.
The continuous image-text splicing method also comprises the calibration of medium transmission before printing, and the specific method comprises the following steps: the method comprises the steps of firstly enabling a printing trolley to move from a right initial end to a left final end along a first direction, jetting a straight line from a certain row of jet holes arranged along a second direction after the printing trolley reaches the left final end, then controlling the distance of a medium conveying table surface by a paper feeding mechanism, simultaneously enabling the printing trolley to move from the left final end to the right initial end along the first direction, jetting a straight line from the same row of jet holes after the printing trolley reaches the right initial end again, comparing whether the front line and the rear line are completely overlapped, if the front line and the rear line are completely overlapped, indicating that the medium moving distance is accurate, if the front line and the rear line are not overlapped, indicating that an error exists in the medium conveying process, measuring the distance between the two lines, calculating the actual distance of the medium conveying table surface, and performing error compensation on the actual medium conveying distance by software according to the numerical values.
The continuous image-text splicing method comprises the following specific steps: step S11, the control system controls the printing trolley to continuously move from the right initial end to the left end along the first direction, and photographs the printing trolley when the camera passes over each identification position, and the software performs parameter calculation according to the identification images photographed by the camera; step S12, the control system controls the print trolley to move from a left end point to a right start point along a first direction; step S13, the printing trolley moves from the right initial end to the left final end along the first direction again, and ink drops are controlled to be ejected in an actual area to be printed according to parameters calculated by software; step S14, the control system controls the printing trolley to move from the left end point to the right initial end along the first direction; step S15, the software judges whether the image of the desktop is printed, if not, step S16 is executed, the control system controls the print trolley to step a small distance along the second direction, and then steps S13-S15 are repeatedly executed; if yes, executing step S17, judging whether the printing of the whole printing medium is finished by software, if not, executing step S18, driving the printing medium to convey the printing length of a desktop along the first direction by the paper feeding mechanism, and then carrying out steps S11-S17 again; if so, the printing ends.
In the above continuous image-text splicing method, the camera photographing and parameter calculating process in step S11 is as follows: firstly, before a printing device starts to move, software pre-processes graphic information to be printed of each desktop, calculates each identification theoretical position, and calculates position coordinates required to trigger a camera to take a picture according to each identification theoretical position; and then the control system controls the print trolley to shoot each mark below according to each position trigger signal trigger camera in the process of moving from the right initial end to the left final end along the first direction, the shot picture is fed back to the software, the software performs image recognition processing on the picture, and the actual position coordinates and correction parameters of the mark are calculated.
In the continuous image-text splicing method, the marked actual position coordinates comprise actual center points O (x, y), and the marked actual center points O (x, y) and the marked theoretical center point coordinates O preset by software are used for the marking 0 （x 0 ，y 0 ) And comparing to calculate a correction parameter.
In the above continuous image-text stitching method, the correction parameter includes that the offset value in the first direction is denoted as Δx, and Δx is x and x 0 Is a difference in (2); offset value Deltay in the second direction, deltay being y and y 0 Is a difference in (c).
In the continuous image-text splicing method, the correction parameters further comprise a scaling in a first direction, wherein the scaling in the first direction is a ratio of a distance between a front mark center point and a rear mark center point of a page to a distance between the front mark center point and the rear mark center point of the page in a preset theory; the medium angle offset is obtained by using an inverse trigonometric function, and the numerical value of the inverse trigonometric function is calculated according to the ratio of the distance between the first direction and the distance between the second direction of the two mark center points before and after one page.
In the above continuous image-text stitching method, the image identification processing includes: firstly, performing binarization processing on an image obtained by photographing a camera; identifying by using the OpenCV; then filtering out the identification actually needed to be used; and finally, calculating the identified identification position information.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, by using the detection device, when the coiled material medium with continuous graphics context is printed, the actual position of the mark on the medium can be detected, and printing is controlled according to the fed-back actual position of the mark, so that the position of the printed graphics context is accurate, graphics context on a desktop can be aligned and continuously spliced, and the spray painting quality is ensured.
2. When the invention uses the camera to detect, the offset value in the first direction, the offset value in the second direction, the scaling in the first direction and the medium angle offset can be corrected and calibrated for each page to be printed in each desktop, so that the image-text printing accuracy on each page is ensured.
3. According to the ink-jet printing device, the first direction and the second direction of movement are set for the printing trolley, so that the printing resolution and the color vividness of the pictures and texts printed on coiled material media can be improved, and the printing quality is improved.
Drawings
FIG. 1 is a perspective view of an inkjet printing apparatus according to one embodiment of the invention;
FIG. 2 is a left side view of an ink jet printing apparatus according to one embodiment of the present invention;
FIG. 3 is a schematic view of the direction of motion of the print carriage relative to the print table of the present invention;
FIG. 4 is a schematic diagram showing the transmission direction of the medium transmission portion according to an embodiment of the present invention;
FIG. 5a is a top view of a print carriage prior to printing in one embodiment of the present invention;
FIG. 5b is a top view of the print carriage after printing the first table image in the state shown in FIG. 5 a;
FIG. 5c is a top view of the table after the condition shown in FIG. 5b and before printing the next table image;
FIG. 5d is a top view of the print carriage after printing the table image in the state shown in FIG. 5 c;
FIG. 6 is a schematic illustration of a stitched image printed during the process of FIGS. 5a-5 d;
FIG. 7 is a schematic diagram of a sensor detecting a signature according to an embodiment of the present invention;
FIG. 8 is a flow chart of a printing method using a sensor to detect a mark in an embodiment of the present invention;
FIG. 9 is a flowchart of an algorithm for sensor correction in the method of FIG. 8;
FIG. 10 is a flowchart of a printing method using a camera to detect identification in another embodiment of the invention;
FIG. 11 is a schematic diagram of the types of deviations that can be corrected when using a camera to detect a logo in accordance with the present invention;
FIG. 12 is a schematic diagram of a sensor offset input interface for a software operator interface according to the present invention;
FIG. 13 is a schematic diagram of a software operator interface media movement calibration interface according to the present invention;
FIG. 14 is a schematic view of a showerhead alignment interface according to another embodiment of the present invention.
In the drawings, a 1-first direction driving mechanism, a 2-second direction driving mechanism, a 3-third direction driving mechanism, a 4-printing trolley, a 5-printing tabletop, a 6-scraping maintenance device, a 7-paper feeding mechanism, 8-media, 9-printing patterns, 11-first drag chains, 12-first direction guide rails, 13-first direction sliding blocks, 14-first motors, 15-first brackets, 21-second drag chains, 22-second direction guide rails, 23-second direction sliding blocks, 24-second brackets, 31-third motors, 32-third direction air ejector rods, a 41-curing device, 42-detection devices, 43-ejection heads, 71-paper discharging mechanisms, 72-paper collecting mechanisms, identification marks 81, X-first directions, Y-second directions, Z-third directions, L-media conveying distances each time, m-offset amounts, S01-S09, S1-S8 and S11-S18.
Detailed Description
The following describes the continuous image-text splicing method for the ink-jet printer in detail with reference to the accompanying drawings.
The method is applied to an ink-jet printer for intermittently conveying coiled materials media according to fixed distances, and the paper feeding length of each conveying of the media is the printing length of a table top. An inkjet printer conveyed in the above manner will be described in detail with reference to fig. 1 and 2. The inkjet printer of this embodiment includes a printing section including a first-direction (X-axis direction) driving mechanism 1, a second-direction (Y-axis direction) driving mechanism 2, a third-direction (Z-axis direction) driving mechanism 3, a print carriage 4, and a wiping maintenance device 6, a medium conveyance section including a print table top 5 and a paper feed mechanism 7, and a control system for controlling the movement of the print carriage, the inkjet of the head, and the movement of the medium conveyance section. The print carriage 4 is mounted above the print table top 5, and print heads for ejecting magenta (M), yellow (Y), cyan (C) and black (K) inks are mounted on the print carriage 4, and at least one of the heads for each color ink can be used to print the same color ink by using a plurality of the heads for increasing the printing speed. The print carriage 4 of the present invention may be provided with a print head for ejecting white (W) ink and/or clear (V) ink, and may be provided with a print head for ejecting spot color ink. The carriage 4 spans in the width direction (Y-axis direction) of the printing table 5. The left side of the print carriage 4 (the operator faces the left hand end of the printing apparatus shown in fig. 1) is further provided with a mark detecting device (not shown) for detecting a mark printed in advance on the medium on the print table 5 in real time, and the detecting device may use a sensor or a camera. An ink cartridge for containing ink and a corresponding negative pressure control system may be provided on the carriage 4. The ink used by the printing nozzle is UV ink. A curing device 41 for curing the ejected ink may be installed at both ends of the carriage 4, respectively. The curing device of the present invention is composed of a plurality of LEDs for irradiating ultraviolet rays arranged in the second direction, and the present invention may be also configured to install a curing device at only one end of the carriage 4, such as at only the left end of the carriage (the operator facing the left-hand end when printing is shown in fig. 1) or at only the right end of the carriage (the operator facing the right-hand end when printing is shown in fig. 1). The irradiation intensity of the curing device can also be set in an intelligently adjustable way.
A scraping maintenance device 6 is arranged below the initial position of the printing trolley 4, and the scraping maintenance device 6 is used for scraping a spray head arranged below the printing trolley 4 to prevent spray holes from being blocked; when the printer stops working, the ink scraping maintenance device 6 can also carry out moisturizing maintenance on the spray nozzle, prevent the ink in the spray hole from drying and solidifying, avoid damaging the spray hole and ensure the spray painting quality.
The carriage 4 can move in three directions under the control of the control system, as shown in fig. 3: the first direction is the X-axis direction in the figure (the X-axis direction is parallel to the direction in which the first carriage 15 is located), and includes moving from the initial end (the right-hand end when the operator faces the printer operation) to the final end (the left-hand end when the operator faces the printer operation) of the first direction, and moving from the final end to the initial end of the first direction; the second direction is the Y-axis direction (the X-axis is perpendicular to the Y-axis direction) in the figure, and the micro stepping motion in the second direction is included; the third direction is the Z-axis direction (i.e. the height direction perpendicular to the printing platform 5) in the figure, and the printing trolley moves up and down in the third direction to adjust the distance between the plane of the spray hole of the spray nozzle before printing and the medium or to print 2.5D/3D image effect. The movement of the print carriage 4 in three directions is controlled by the first direction driving mechanism 1, the second direction driving mechanism 2 and the third direction driving mechanism 3 respectively.
The first direction driving mechanism 1 comprises a first drag chain 11, a first direction guide rail 12, a first direction sliding block 13, a first motor 14 and a first bracket 15, wherein the control system controls the first motor 14 to drive the printing trolley 4 to repeatedly move along a first direction (X-axis direction) at a basically constant speed, the first direction sliding block 13 arranged below the printing trolley 4 is matched with the first direction guide rail 12 above the first bracket 15 to restrict the movement direction in the movement process, two first direction guide rails 12 are arranged at the front side and the rear side of the width direction (Y-axis direction) of the printing platform 5 respectively, the printing trolley 4 is transversely arranged above the two first direction guide rails 12, and two first direction sliding blocks 13 are respectively arranged at two sides of the lower end of the printing trolley along the X-axis direction and are matched with the first direction guide rails 12. The first direction driving mechanism 1 further includes a first drag chain 11, the first drag chain 11 being mounted on a drag chain plate (not shown in the figure), the first drag chain 11 reciprocating in a first direction (X-axis direction) with the print carriage 4. In the process of moving the print carriage 4 along the first direction (X-axis direction), the control system needs to control the inkjet of the nozzle below the print carriage or control the detection device arranged on the left side of the print carriage to detect the identification of the medium.
The second direction driving mechanism 2 includes a second drag chain 21, a second direction guide rail 22, a second direction slide block 23, a second support 24 and a second motor (not shown in the figure), the control system can control the second motor to drive the print carriage 4 to move along a second direction (Y-axis direction), the second direction slide block 23 installed below the print carriage 4 cooperates with the second direction guide rail 22 installed above the second support 24 to restrict the Y-axis movement direction during the movement, two second direction guide rails 22 are provided in this embodiment, and two second direction slide blocks 23 and second direction guide rails 22 are respectively provided below the print carriage along two sides of the Y-axis direction. The second drag chain 21 in the second direction driving mechanism 2 is mounted on a drag chain plate (not shown in the figure), the drag chain plate is of a groove structure, and the second drag chain 21 moves in a micro-step manner along the second direction (Y-axis) along with the print carriage 4. During the movement of the carriage 4 in the second direction (Y direction), the ejection head does not eject ink droplets.
The third direction driving mechanism 3 includes a third motor 31, a third direction air ejector rod 32, and the control system can control the third motor 31 to drive the print carriage 4 to move up and down along a third direction (Z-axis direction), and in this embodiment, four third direction air ejector rods 32 are provided, and four groups of optical axes and bearing seats (not shown in the figure) are simultaneously provided to restrict the Z-axis movement direction. The lifting device may take other forms as long as it can ensure the vertical movement of the carriage 4 in the third direction (Z-axis direction). The third direction driving mechanism 3 can drive the print carriage 4 to vertically lift along a third direction (Z-axis direction) to adjust the distance between the nozzle and the print medium, and in addition, a tiny height lifting operation can be performed to print a stereoscopic effect with concave-convex texture.
The paper feed mechanism 7 of the present invention includes a paper feed mechanism 71, a paper feed mechanism 72, a driving roller, and a plurality of guide rollers (not shown), and a left guide roller and a right guide roller are provided at both left and right ends of the printing table 5 in the first direction (X-axis direction), respectively. When the printing medium is coiled material, the printing medium is arranged on the paper placing mechanism 71, one end of the printing medium passes through a plurality of guide rollers to be wound on a left guide roller at the left end of the printing table top 5, then the printing medium stretches across the whole printing table top 5 and is wound on a right guide roller at the right end of the printing table top 5, and finally the printing medium is wound on the paper collecting mechanism 72 through a driving roller and a plurality of guide rollers. When the print medium requires a multipass mode to print an image, the paper feed mechanism 7 intermittently conveys in the first direction (X-axis direction): after the paper feeding mechanism 7 conveys the medium to be printed onto the platform, the conveying is stopped, the printing trolley 4 performs image-text printing on the desktop medium in a multi-pass scanning mode, after the image-text printing on the desktop medium is completed, the paper feeding mechanism 7 conveys the medium 8 according to the printing length of a desktop, as shown in fig. 4, the printing length of the desktop is L, then the medium 8 is static, and the printing trolley 4 performs image-text printing on the desktop again in the multi-pass scanning mode, so that the printing is repeated until the printing of the whole coiled material medium is completed.
A specific printing process according to one embodiment of the present invention will be described in detail with reference to fig. 5a-5 d. In this embodiment, the printable length of each desktop is L, that is, the medium transfer distance is L, as shown in fig. 5a, in this embodiment, seven pages of graphics may be printed on each desktop length, each page of graphics is printed with a three-digit serial number in sequence, before each page of graphics is printed, an identifier 81 is printed on the edge of each page in advance, where the identifier is a black rectangular identifier, and in addition, other identifiers with different colors from the medium, or identifiers that may be detected by a detecting device, such as a circle, a cross mark, and the like, may also be used. After the printing starts, the detection device 42 identifies the mark 81 on the medium 8, the print carriage 4 performs the multi-pass scanning printing of the round trip movement along the first direction (X-axis direction), and simultaneously, the detection device 42 on the print carriage 4 performs the multi-pass scanning printing of the ink jet nozzle 43 in the actually corresponding area to be printed according to the mark position parameter fed back by the detection device 42, as shown in fig. 5b after the image text (001-007 pattern) on the present table surface is printed, the conveying mechanism conveys the medium 8 to the right along the X-axis direction by the length L of the table surface, the print carriage 4 moves back to the first direction (X-axis direction) and the initial end of the second direction (Y-axis direction), the mark 81 is printed on the medium of the second table surface in advance, as shown in fig. 5c, the detection device 42 on the print carriage 4 performs the identification again, and the round trip movement of the mark 81 on the medium 8 in the first direction (X-axis direction), and simultaneously, the detection device 42 on the print carriage 4 performs the round trip movement along the second direction (Y-axis direction) again, and the ink jet nozzle 4 performs the multi-pass printing of the round trip movement along the first direction (X-axis direction) according to the mark position parameter fed back by the detection device 4, as shown in fig. 5c, and the image text (X-axis direction) is printed on the medium 8, and the image text (X-axis direction) is printed on the table surface) and the surface, and the image text (X-axis direction) is printed on the table surface, and the medium is printed on the table surface, and the image (X-surface) and the image surface) is the image (X-sheet) and the image surface).
Because the detection device carries out identification on the medium on each desktop before printing, the position deviation in the medium transmission process can be overcome, and the images and texts on the front and rear desktops are continuously spliced, as shown in fig. 6, the spliced images and texts have the effect of continuous paper feeding printing.
Example 1
In this embodiment the detection means 42 uses a sensor that is triggered during movement past the marking on the underlying medium and feeds back the position information there, and the software uses the actual position information detected by the sensor to correct errors in the first direction (X-axis direction) of the inkjet printing process.
The detection of the marks by the sensor, which need to be of a different color than the print medium, will first be described with reference to fig. 7, again taking the black rectangular marks as an example. In the moving process of the printing trolley along the first direction (X-axis direction), a sensor arranged at the left end of the printing trolley detects the mark on the medium below, and when the mark reaches the starting position of the edge of the black rectangular mark, the sensor is triggered, feeds back a rising edge signal and continuously keeps high level until the sensor feeds back a falling edge signal when the tail end of the black rectangular mark is finished. The software calculates the preset width from the rising edge to the falling edge according to the preset number of pixel points of the actual black mark, for example, the preset width calculated in the embodiment is 2mm, when the width is smaller than the preset width of 2mm, the width is regarded as interference noise point and is ignored, and the method can filter out the interference information which does not belong to the mark, such as impurities on the medium. When the width value between the rising edge and the falling edge reaches the preset width of 2mm, the effective mark is considered to be detected, and the position information of the feedback mark is used for error correction in actual printing in software.
The printing method using the sensor detection marks is described in detail below with reference to fig. 8, in which the carriage is located at the right-side initial end in the first direction (X-axis direction) and the front initial end in the second direction (Y-axis direction) before printing of the medium is started. After the start button is started, step S01, the control system controls the print trolley to move from the right initial end to the left end along the first direction (X-axis direction), and in the moving process, a sensor at the left end of the print trolley detects a first mark on a medium and feeds back the position information of the first mark to software; step S02, the software calculates the actual needed ink-jet starting position and the actual needed ink-jet ending position of the desktop medium according to the position information fed back by the sensor; step S03, spraying a preset pattern to an actual image-text area to be printed when the printing trolley passes over the actual area to be printed in the moving process of the printing trolley along the first direction (X-axis direction); step S04, a print trolley moves from a left terminal end to a right initial end along a first direction (X-axis direction); step S05, judging whether the image-text printing of the desktop is finished, if not, executing step S06, stepping the printing trolley for a small distance along the second direction (Y-axis direction), and then repeatedly executing steps S03-S05; if yes, executing step S07, and moving the printing trolley back to the front initial end in the second direction (Y-axis direction); step S08, the software judges whether all the media are printed, if yes, the printing is finished; if not, go to step S09, the paper feeding mechanism drives the medium to convey the medium with a desktop distance along the first direction (X-axis direction), and then repeatedly execute steps S01-S08 until the printing of the whole roll of medium is completed, and the printing job is finished.
It should be noted that, the steps S01, S02 and S03 are completed simultaneously in the process that the print carriage moves from the initial end to the final end along the X axis, that is, the sensor feeds back information to the software after detecting the first identifier of a desktop, the software immediately controls the spray head to print the graphics context of the whole desktop through calculation, and the detection and printing are completed simultaneously, thereby improving the printing efficiency.
The following specifically describes the algorithm flow of the sensor to the identification detection in the detection device according to fig. 9, firstly, each desktop to be printed image-text processed by the software RIP is prepared in advance in the program, the preset printing start position is marked as an a point coordinate, and a desktop printing end position is marked as a B point coordinate. After the print carriage starts to move along the first direction (X-axis direction), the sensor detection program starts, firstly, step S1 is executed to judge whether the print medium is a blank page, if so, step S7 is executed, and printing is directly started by the preset coordinates of the point A of the print starting position in the program; if the print medium is not a blank page, executing step S2 to judge whether the desktop medium is printed for the first time, if yes, executing step S3, wherein the sensor detects the mark in the moving process along the first direction (X-axis direction) along with the print trolley, and the sensor only detects the first mark in the embodiment; step S4, the program judges whether the mark is detected before the point A of the printing initial position, if not, the error is reported; if the mark is detected before, executing step S5, defining the detected actual mark position as the A ' point position, calculating a difference delta a between the preset printing start position A point coordinate and the detected actual mark position A ' point coordinate, and then correcting the preset printing end position B point coordinate into the actual printing end position B ' point coordinate by using the difference delta a; in step S6, the software controls the head to start printing from the actual identification position a 'in the first direction (X-axis direction) until the printing is stopped by moving to the actual printing end position B'. If it is determined in step S2 that the tabletop medium is not first-pass printing (i.e., multi-pass scanning printing after the subsequent step), step S8 is executed, in which the inkjet job is directly performed with the actual marking position a 'as the inkjet start position and the actual printing end position B' as the end printing position, and the movement of the carriage in the first direction and the second direction and the conveyance process of the medium by the paper feeding mechanism are the same as those in the above-described flow of fig. 8. After each piece of to-be-printed medium with the length of one desktop is conveyed on the desktop, the algorithm process is carried out for one time according to the principle that the sensor detects the identification position, and then the corresponding printing of the actual image and text of the desktop is carried out.
The process is a step process of printing on one side of the medium, and if the front side and the back side of the medium are required to be printed with graphics and texts, the graphics and texts on the front side and the back side of the medium are ensured to be mutually corresponding and have no deviation, and the following detection printing process of back side spray painting can be carried out: when printing on the reverse side of the medium, the reverse side of the medium is conveyed upwards, the front side of the medium on which the graphics are printed is downwards, before the paper is fed to the upper side of the table top, a sensor is installed to detect the graphics on the front side on which the printing of the medium is finished, the embodiment is still taken as an example, each table top prints seven pages of graphics, the first graphics on the front side of each page trigger the sensor to record once, the sensor needs to record the number of the graphics on each page, when the graphics on each page detect the graphics, the feedback signal controls the motor braking of the paper feeding mechanism, the medium stops conveying, the motor braking process is a deceleration process, so that the medium conveying has an overshoot, a pinch roller encoder which is also installed above the table top feeds back the overshoot distance of the medium at the moment, and feeds back the overshoot distance to software, and the software calculates the actual position reached by the graphics on the front side and the back of the corresponding graphics according to the overshoot distance, so that the images on the front side and the back sides of the table top and the table top can print with the actual coordinates of the graphics on the basis of the graphics on the front side and the side of the graphics as a reference, and the front side are ensured to have good matching of the positions of the graphics on the front side.
Example two
In this embodiment, the detecting device 42 uses a camera, software calculates the position information of the trigger signal for controlling the camera to take a photograph in advance, the position information is the position where each mark is calculated in advance, when the camera reaches the position, the trigger signal is sent out, the camera takes a photograph of the mark below after receiving the trigger signal, the software identifies the photographed photograph, calculates the position parameter where the mark is actually located, and feeds back the position parameter to the control system to control the nozzle to spray ink correspondingly.
Next, a detailed description will be given of a printer moving flow detected by using a camera with respect to fig. 10, in which the carriage is located at the right-side initial end in the first direction (X-axis direction) and at the front initial end in the second direction (Y-axis direction) when printing is started on the medium on each table. Before primary printing, a camera firstly calibrates the mark, specifically: the trolley moves leftwards from the initial end on the right side, continuously photographs the lower part in the moving process, after a complete mark is photographed and a contour is identified through software, the software records the physical coordinates of the camera moving to the identified mark position, the software calculates the coordinates of the central point of the mark, identifies the coordinates of the feature mark in an image, simultaneously records and stores the feature mark in the image in a self-running manner, and then determines the mapping relation between the image coordinates of the mark central point and the physical coordinates according to the recorded physical coordinates and the corresponding image coordinates, and is used for accurately controlling the ink-jet position in the subsequent printing process; or before the primary printing, the operator can manually move the first mark to the position right below the camera at the starting position of the printing trolley, and then start the formal printing flow: step S11, the control system controls the printing trolley to continuously move from the right initial end to the left final end along the first direction (X-axis direction), and photographs the printing trolley when the camera passes over each identification position, and the software performs parameter calculation according to the identification images photographed by the camera; step S12, the control system controls the printing trolley to move from the left end point to the right start point along the first direction (X-axis direction); step S13, the printing trolley moves from the right initial end to the left final end along the first direction (X-axis direction) again, and ink drops are controlled to be ejected in the actual area to be printed according to parameters calculated by software; step S14, the control system controls the printing trolley to move from the left terminal end to the right initial end along the first direction (X-axis direction); step S15, the software judges whether the image of the desktop is printed, if not, step S16 is executed, the control system controls the print trolley to step a small distance along the second direction (Y-axis direction), and then steps S13-S15 are repeatedly executed; if yes, executing step S17, judging whether the printing of the whole printing medium is finished by software, if not, executing step S18, driving the printing medium to convey the printing length of a desktop along the first direction (X-axis direction) by the paper feeding mechanism, and then carrying out steps S11-S17 again; if so, the printing ends.
In the printing process, before each table medium is printed, the camera performs one-pass identification photographing, the software performs position parameter identification on the identifications in the photos, and then the nozzle is controlled to correspondingly jet ink according to the actual positions of the identifications, so that error accumulation in the transmission process does not exist, and the printed image of each page in each table can be ensured to be the correct position which is actually required to be printed.
The following details of the process of photographing the identifier by the camera and calculating parameters by the software in step S11: firstly, before a printing device starts to move, software pre-processes graphic information to be printed of each desktop, calculates each identification theoretical position, and calculates position coordinates required to trigger a camera to take a picture according to each identification theoretical position; then in the process that the control system controls the printing trolley to move from the right initial end to the left final end along the first direction, triggering the camera to photograph each mark below according to each position triggering signal, and feeding back the photographed picture to the software, wherein the software feeds the pictureThe line image recognition processing is performed to calculate the actual position coordinates of the mark, in this embodiment, the coordinates of the X-axis and Y-axis of the actual center point of the mark are calculated, and are recorded as the actual center point O (X, Y), and the calculated actual center point O (X, Y) of the mark is then combined with the coordinate O of the theoretical center point of the mark preset by software 0 （x 0 ，y 0 ) And comparing to calculate a correction value. As shown in FIG. 11, the compensation-enabled correction value includes an offset value in the first direction (X-axis direction) denoted as Deltax, deltax being X and X 0 Is a difference in (2); offset value Deltay in the second direction (Y-axis direction), deltay being Y and Y 0 Is a difference in (2); scaling in a first direction (X-axis direction), wherein the scaling in the X-axis direction is the ratio of the distance between the front and rear two mark center points of a page to the distance between the front and rear two mark center points of the page in preset theory; and the medium angle offset can be obtained by using an inverse trigonometric function, and the numerical value of the inverse trigonometric function is calculated according to the ratio of the distance in the X-axis direction and the distance in the Y-axis direction of the front and rear two mark center points of one page. In the actual printing process, which numerical values can be corrected can be selected for use according to actual needs. The parameters to be corrected are fed back to the software, and the nozzle is controlled to accurately discharge ink after the software is processed, so that the ink drops are dropped at the actual required positions, and the spray painting quality is ensured.
For the black rectangular mark in the embodiment, the image identification positioning method for the mark is as follows: firstly, performing binarization processing on an image obtained by photographing a camera; identifying by using the OpenCV; then filtering out the rectangular mark actually needed to be used (the rectangular mark is filtered and screened according to area calculation); and finally, calculating the actual center point O coordinates (x, y) of the identified rectangular mark, so as to obtain the center point position information of the actual mark shot by the camera, and comparing the information with a preset theoretical value to obtain the correction parameters for finally controlling the ink jet.
Before the official printing, the operator needs to make some settings and calibrations at the software interface, several main operation interfaces are described below with reference to fig. 12-14.
First, the detection device offset interface is described, since the detection device is mounted on the left side of the print carriage at a distance from the ejection head, and therefore the offset distance, i.e., the offset m value shown in fig. 5a-5d, should also be taken into account when controlling when ejecting ink. If the sensor is used in the detection device, the horizontal distance between the position of the sensor emission signal and the straight line of the first row of spray holes on the left side of the print carriage is defined as the sensor offset, and the required parameters need to be filled in the interface of the sensor offset, as shown in fig. 12, the distance value is 249mm in this example, and thus the value is filled in. When the software controls the ink to be discharged from the spray hole, the ink is controlled after the sensor detects the actual position of the mark and translates the offset m.
Fig. 13 is a calibration interface including mechanical calibration, step calibration, horizontal calibration, media movement, etc. before the beginning of the regular printing. The calibration of the media delivery error is briefly described herein, i.e. the movement of the media under the software calibration interface, where the desired distance in the interface, i.e. the length of a desktop medium that the paper feed mechanism theoretically delivers, is 1000mm, and the actual distance is the distance value tested during the actual delivery of the media. The specific test method comprises the following steps: the method comprises the steps of firstly enabling a printing trolley to move from a right initial end to a left final end along a first direction (X-axis direction), jetting a straight line along a certain row of jet holes arranged along a second direction (Y-axis direction) after reaching the left final end, controlling the distance of a medium conveying table surface by a paper feeding mechanism, simultaneously enabling the printing trolley to move from the left final end to the right initial end along the first direction (X-axis direction), jetting a straight line again along the same row of jet holes after reaching the right initial end, comparing whether the front row of jet holes and the rear row of jet holes are completely overlapped or not, if the front row of jet holes and the rear row of jet holes are completely overlapped, indicating that the moving distance of the medium is accurate, filling 1000mm in a column of actual distance in a calibration interface in FIG. 13, if the front line and the rear line are not overlapped, indicating that an error exists in the conveying process of the medium, measuring the distance between the two straight lines, and then calculating the actual distance of the medium conveying table surface, and filling the interface. The software automatically controls the error compensation to the actual moving distance of the medium.
FIG. 14 is a schematic view of a showerhead interface according to another embodiment of the present invention, the interface reflecting the alignment of the showerhead: in this embodiment, twelve nozzles are provided, and every three nozzles are spliced in the second direction (Y-axis direction) to form one set, so that the printing coverage distance in the second direction is widened, and the twelve nozzles form four sets in total. Each spray head comprises two rows of spray holes, the first group of spray heads are arranged to be white ink spray heads from left to right, and the two rows of spray holes of the three spray heads spray white ink drops; the second group of spray heads are arranged as yellow and magenta ink spray heads, the third group of spray heads are arranged as cyan and black ink spray heads, and each row of spray holes of the color ink spray heads in the second group and the third group spray one color; the fourth group of spray heads are transparent ink spray heads, and the transparent ink spray heads are the same as the white ink spray heads, and two rows of spray holes of the three spray heads spray transparent ink drops. In addition to this embodiment, the nozzles may be used only for printing transparent ink or only for printing color patterns, and specific features such as the number of the nozzles, the splicing manner, the color of the ink, etc. may be set according to actual printing requirements, which is not particularly limited in the present invention.
It should be noted that any modifications made to the embodiments according to the present invention do not depart from the spirit of the invention and the scope of the present invention as set forth in the appended claims.
Claims (8)
1. A continuous image-text splicing method for an ink-jet printer comprises the following steps: the printing trolley is provided with a printing spray head which moves back and forth along a first direction along with the printing trolley; the paper feeding mechanism intermittently conveys the medium along the first direction, and conveys the paper feeding distance of a tabletop at each time; the control system controls the work of the printing trolley, the paper feeding mechanism and the printing spray head; a camera is arranged at the side of the printing trolley, the camera can carry out error correction on offset in the first direction, offset in the second direction, stretching in the first direction and angle deflection on printing pictures and texts, marks are printed on a medium in advance, software calculates the theoretical position of the marks in advance, in the actual printing process, the camera detects and feeds back the actual position of the marks on the medium, the software carries out parameter calculation according to the actual position of the marks and the theoretical position, and the picture and texts matched with the actual mark position are printed by utilizing the parameter correction control system, and the printing method is characterized by further comprising calibration on medium transmission before printing, and the specific method comprises the following steps: the method comprises the steps of firstly enabling a printing trolley to move from a right initial end to a left final end along a first direction, jetting a straight line from a certain row of jet holes arranged along a second direction after the printing trolley reaches the left final end, then controlling the distance of a medium conveying table surface by a paper feeding mechanism, simultaneously enabling the printing trolley to move from the left final end to the right initial end along the first direction, jetting a straight line from the same row of jet holes after the printing trolley reaches the right initial end again, comparing whether the front line and the rear line are completely overlapped, if the front line and the rear line are completely overlapped, indicating that the medium moving distance is accurate, if the front line and the rear line are not overlapped, indicating that an error exists in the medium conveying process, measuring the distance between the two lines, calculating the actual distance of the medium conveying table surface, and performing error compensation on the actual medium conveying distance by software according to the distance.
2. The continuous graphic splicing method according to claim 1, wherein the mark is a rectangular mark, a circular mark or a mark line.
3. The continuous graphic splicing method as claimed in claim 1, comprising the specific steps of: step S11, the control system controls the printing trolley to continuously move from the right initial end to the left end along the first direction, and photographs the printing trolley when the camera passes over each identification position, and the software performs parameter calculation according to the identification images photographed by the camera; step S12, the control system controls the print trolley to move from a left end point to a right start point along a first direction; step S13, the printing trolley moves from the right initial end to the left final end along the first direction again, and ink drops are controlled to be ejected in an actual area to be printed according to parameters calculated by software; step S14, the control system controls the printing trolley to move from the left end point to the right initial end along the first direction; step S15, the software judges whether the image of the desktop is printed, if not, step S16 is executed, the control system controls the print trolley to step a small distance along the second direction, and then steps S13-S15 are repeatedly executed; if yes, executing step S17, judging whether the printing of the whole printing medium is finished by software, if not, executing step S18, driving the printing medium to convey the printing length of a desktop along the first direction by the paper feeding mechanism, and then carrying out steps S11-S17 again; if so, the printing ends.
4. The continuous graphic splicing method according to claim 3, wherein the camera photographing and parameter calculating process in step S11 is as follows: firstly, before a printing device starts to move, software pre-processes graphic information to be printed of each desktop, calculates each identification theoretical position, and calculates position coordinates required to trigger a camera to take a picture according to each identification theoretical position; and then the control system controls the print trolley to shoot each mark below according to each position trigger signal trigger camera in the process of moving from the right initial end to the left final end along the first direction, the shot picture is fed back to the software, the software performs image recognition processing on the picture, and the actual position coordinates and correction parameters of the mark are calculated.
5. The continuous graphic splicing method as claimed in claim 4, wherein the identified actual position coordinates include an actual center point O (x, y), and the identified actual center point O (x, y) and a software preset identified theoretical center point coordinate O 0 （x 0 ，y 0 ) And comparing to calculate a correction parameter.
6. The method of claim 5, wherein the correction parameter includes a value of Δx, Δx being x and x 0 Is a difference in (2); offset value Deltay in the second direction, deltay being y and y 0 Is a difference in (c).
7. The continuous graphic splicing method according to claim 5, wherein the correction parameters further comprise a scaling in a first direction, the scaling in the first direction being a ratio of a distance between a front mark midpoint and a rear mark midpoint of a page to a distance between a preset theoretical front mark midpoint and a preset theoretical rear mark midpoint of the page; the medium angle offset is obtained by using an inverse trigonometric function, and the numerical value of the inverse trigonometric function is calculated according to the ratio of the distance in the first direction to the distance in the second direction of the midpoints of the two marks before and after one page.
8. The continuous graphic splicing method according to claim 4, wherein the image recognition processing includes: firstly, performing binarization processing on an image obtained by photographing a camera; identifying by using the OpenCV; then filtering out the identification actually needed to be used; and finally, calculating the identified identification position information.
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| CN113968079B (en) * | 2021-10-21 | 2023-03-24 | 珠海奔彩电子股份有限公司 | Printing method |
| CN114083912B (en) * | 2021-12-01 | 2024-01-16 | 上海商米科技集团股份有限公司 | Intelligent bill printer testing method and system |
| CN114348699A (en) * | 2021-12-29 | 2022-04-15 | 深圳圣德京粤科技有限公司 | Online positioning method and device for printing platform and printing system |
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