CN113500856B - Ink-jet printing plate changing method - Google Patents
Ink-jet printing plate changing method Download PDFInfo
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- CN113500856B CN113500856B CN202110524311.8A CN202110524311A CN113500856B CN 113500856 B CN113500856 B CN 113500856B CN 202110524311 A CN202110524311 A CN 202110524311A CN 113500856 B CN113500856 B CN 113500856B
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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
- 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
- B41J2/07—Ink jet characterised by jet control
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Abstract
The invention discloses an ink-jet printing plate-changing method, wherein an ink-jet printing plate-matching device comprises at least one ink-jet printing head; the displacement device is used for installing the ink-jet printing head and adjusting the coordinates of the ink-jet printing head; the visual detection device is used for acquiring a printing image of the ink-jet printing head; the data processing system analyzes the printed image and determines the corresponding relation between the actual coordinates of the ink-jet printing head and the pixel coordinates on the printed image; and the control system controls the printing of the ink-jet printing head and controls the displacement device to change the position coordinates of the ink-jet printing head. The effect is as follows: printing a nozzle code on a printing stock through a nozzle, then collecting a printing image, and determining the corresponding relation between the actual coordinate of the nozzle and the pixel coordinate on the printing image through data analysis, thereby realizing rapid and accurate plate alignment; when the printing layout changes, the position of the spray head is reversely adjusted according to the pixel position of the layout, so that the quick plate changing is realized.
Description
Technical Field
The invention relates to the technical field of ink jet printing, in particular to an ink jet printing register device, an ink jet printing register method and an ink jet printing plate changing method.
Background
With the development of digitalization and intellectualization, the printing requirement presents a diversified situation, the traditional printing is based on a blank printing stock to print patterns or characters, but with the upgrading of consumption, the market demand of secondary printing is increasingly higher, the requirement on printing technology is also increasingly higher, namely, the printing stock of the primary printing is accurately printed for the secondary time, the printing quality is ensured, and the influence on the primary printing is avoided at the same time, in the prior art, the manual measurement and the repeated debugging are usually carried out until the requirement of the printing is met, if the printing layout changes, the debugging process is repeated, which not only causes a great deal of printing waste, and the manual debugging efficiency is low, the precision is low, and the flexibility is low, so how to quickly and accurately register, how to change the plate quickly after the plate surface is changed so as to meet the printing requirement with position limitation is a problem which needs to be solved urgently by the personnel in the field.
Disclosure of Invention
Therefore, the invention provides an ink-jet printing register device to solve the above problems in the prior art.
The invention aims to provide an inkjet printing register device and method, which print a nozzle code on a printing stock through a nozzle, collect a printing image, and determine the corresponding relation between the actual coordinate of the nozzle and the pixel coordinate on the printing image through data analysis, thereby realizing rapid and accurate register.
Another objective of the present invention is to provide an ink-jet printing plate-changing method, which can reversely adjust the position of the nozzle according to the pixel position of the printing plate when the printing plate changes, thereby realizing rapid plate-changing.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to a first aspect of the present invention, an inkjet printing plate aligning apparatus includes:
at least one inkjet printhead;
the displacement device is used for installing the ink-jet printing head and adjusting the coordinates of the ink-jet printing head;
the visual detection device is used for acquiring a printing image of the ink-jet printing head;
the data processing system analyzes the printed image and determines the corresponding relation between the actual coordinates of the ink-jet printing head and the pixel coordinates on the printed image;
and the control system controls the printing of the ink-jet printing head and controls the displacement device to change the position coordinates of the ink-jet printing head.
Further, the actual coordinate of the inkjet print head on the displacement device is Y.
Further, the pixel coordinates are based on a printing layout of the job description file.
According to a second aspect of the present invention, an inkjet printing registration method using an inkjet printing registration apparatus according to any one of the first aspects of the present invention includes the steps of:
step S1, printing a test image containing the nozzle parameters;
step S2, collecting a nozzle printing test image;
step S3, analyzing the test image to determine the proportional relation D between the actual printing width D 'of the spray head and the pixel width D' on the test image;
step S4, calculating the pixel difference X between the printing range of the job description file and the pixel width of the test image;
and step S5, calculating the offset y of the nozzle coordinate by combining the pixel difference X and the proportional relation D, and controlling the nozzle offset.
Further, the nozzle parameters include, but are not limited to, a nozzle number, actual nozzle coordinates, and a nozzle printing width.
Further, the job description file contains pixel information of a printing range.
Further, the test image is a two-dimensional code and/or a one-dimensional code.
Further, the pixel width is based on a printing layout of the job description file.
According to a third aspect of the present invention, an ink-jet printing plate changing method using an ink-jet printing plate aligning apparatus according to any one of the first aspects of the present invention comprises the steps of:
step W1, obtaining the pixel coordinate L of the nozzle on the current layout;
step W2, calculating the difference x between the pixel coordinates of the printing range of the new printing job description file and the pixel coordinates of the spray head;
and step W3, calculating the offset y' of the nozzle coordinate by combining the difference x and the proportional relation D, and controlling the nozzle offset.
Further, when the layout of the printed file changes, the offset of the nozzle is calculated according to the difference value of the pixel coordinate of the current position of the nozzle and the pixel coordinate of the printing range of the new file, and therefore the layout of the new file is quickly achieved.
The invention has the following advantages: according to the ink-jet printing register device, the spray head prints a test image before working, the visual detection device collects the test image and sends the test image to the data processing system, the data processing system determines the corresponding relation between the actual coordinate of the spray head and the pixel coordinate on the print image by analyzing the print image, and then calculates the actual offset of the spray head by analyzing the pixel difference between the printing range and the printing width of the spray head in the operation description file, and controls the spray head to move so that the printing width of the spray head covers the printing range of the operation description file, thereby realizing the purpose of register; in addition, when the format is changed, the offset of the nozzle under the new format can be calculated by combining the corresponding relation according to the pixel coordinate of the nozzle on the current layout and the pixel difference value of the printing range of the new job description file, and the nozzle is controlled to move, so that the quick format change is realized; moreover, if a plurality of nozzles work simultaneously, the connection with each printing range of the operation description file can be established according to the serial numbers of the nozzles, so that the adjustment of the register and the plate change of the plurality of nozzles is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural diagram of an inkjet printing register device according to the present invention;
FIG. 2 is a schematic diagram of actual coordinates and printing width of a nozzle of an inkjet printing register device according to the present invention;
FIG. 3 is a schematic view of an inkjet printing register device according to the present invention;
FIG. 4 is a schematic view of an inkjet printing plate aligning method according to the present invention;
FIG. 5 is an ink jet printed test image provided by the present invention;
FIG. 6 is a calculated image of an inkjet printed test image and a print job file according to the present invention;
FIG. 7 is a schematic view of an ink-jet printing plate-changing method according to the present invention;
in the figure: 10. an inkjet print head; 20. a displacement device; 30. a visual inspection device; 40. a data processing system; 50. a control system; 100. a printing platform; 200. a substrate; 300. and (5) spraying a head code.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, it should be noted that the actual distance is usually measurable and usually has units of millimeters (mm), and the image-based distance is usually a pixel distance and usually has units of pixels (px).
As shown in fig. 1 to 3, an inkjet printing plate aligning apparatus in an embodiment of a first aspect of the present invention includes:
at least one inkjet printhead 10;
a displacement device 20 for mounting the inkjet print head 10 and adjusting the coordinates of the inkjet print head 10;
a visual inspection device 30 for acquiring a print image of the inkjet print head 10;
a data processing system 40 for analyzing the printed image and determining the correspondence between the actual coordinates of the ink jet print head 10 and the coordinates of the pixels on the printed image;
the control system 50 controls the printing of the inkjet print head 10 and controls the displacement device 20 to change the position coordinates of the inkjet print head 10.
In the above-described embodiment, it should be noted that the data processing system 40 analyzes the print image and determines the correspondence D of the print width D' of the inkjet printhead 10 and the pixel width D ″ on the print image.
The substrate 200 on the printing platform 100 is provided with a nozzle code 300.
During operation, the inkjet printing head 10 prints a test image on the printing stock 200, the visual detection device 30 collects the test image and sends the test image to the data processing system 40, the data processing system 40 analyzes the pixel width D ″ printed in the test image and the coordinate L of the test image, and calculates the corresponding relation D between the printing width D ' and the pixel width D ″ on the print image, the control system calculates the difference X between the coordinate L ″ of the test image and the pixel coordinate L ' of the printing area according to the pixel coordinate L ' of the printing area in the input job description file, and the offset y required by the nozzle can be calculated by combining X and D, and then the control system 50 controls the displacement device 20 to make the inkjet printing head 10 offset y, thereby realizing rapid register operation.
The technical effects achieved by the above embodiment are as follows: the invention relates to an ink-jet printing register device, wherein a spray head firstly prints a test image before working, a visual detection device collects the test image and sends the test image to a data processing system, the data processing system determines the corresponding relation between the actual coordinate of the spray head and the pixel coordinate on the print image by analyzing the print image, and then calculates the actual offset of the spray head by analyzing the pixel difference between the printing range and the printing width of the spray head in an operation description file, and controls the spray head to move so that the printing width of the spray head covers the printing range of the operation description file, thereby realizing the aim of register.
Alternatively, as shown in fig. 1-3, in some embodiments, the actual coordinate of the inkjet printhead 10 on the displacement device 20 is Y.
Alternatively, as shown in fig. 1-3, in some embodiments, the pixel coordinates are based on the print layout of the job description file.
As shown in fig. 4 to 6, an inkjet printing plate aligning method in an embodiment of a second aspect of the present invention uses an inkjet printing plate aligning apparatus in an embodiment of any one of the first aspect of the present invention, including the steps of:
step S1, printing a test image containing the nozzle parameters;
step S2, collecting a nozzle printing test image;
step S3, analyzing the test image to determine the proportional relation D between the actual printing width D 'of the spray head and the pixel width D' on the test image;
step S4, calculating the pixel difference X between the printing range of the job description file and the pixel width of the test image, wherein the job description file comprises the pixel information of the printing range;
and step S5, calculating the offset y of the nozzle coordinate by combining the pixel difference X and the proportional relation D, and controlling the nozzle offset.
The technical effects achieved by the above embodiment are as follows: according to the inkjet printing plate aligning method, a nozzle prints a test image before working, a visual detection device collects the test image and sends the test image to a data processing system, the data processing system determines the corresponding relation between the actual coordinate of the nozzle and the pixel coordinate on the print image by analyzing the print image, then the data processing system analyzes the pixel difference between the printing range and the printing width of the nozzle in an operation description file, calculates the actual offset of the nozzle according to the corresponding relation and the pixel difference, and controls the nozzle to move so that the printing width of the nozzle covers the printing range of the operation description file, and therefore the aim of aligning the plate is achieved.
Optionally, as shown in fig. 4 to 6, in some embodiments, the nozzle parameters include, but are not limited to, a nozzle number, a nozzle actual coordinate, and a nozzle printing width.
Alternatively, as shown in fig. 4-6, in some embodiments, the job description file contains pixel information for a print range.
Optionally, as shown in fig. 4 to 6, in some embodiments, the test image is a two-dimensional code and/or a one-dimensional code.
In the above optional embodiments, it should be noted that the printing width of the nozzles can be determined by printing the test image, and in general, a two-dimensional code or a one-dimensional code is printed, which may include information such as the serial numbers of the nozzles, so that each nozzle can be adjusted in a multi-nozzle printing scene.
Alternatively, as shown in fig. 4-6, in some embodiments, the pixel width is based on the print layout of the job description file.
In the above optional embodiment, it should be noted that, the analysis of the collected test image is based on the printing layout, and in general, if the printing layout is white paper, four corners of the printing layout can be identified; if the printing layout is a printed matter with printing patterns, specific marks, symbols, figures and the like on the printed matter can be taken as a basis.
It should be further noted that the unit of D ═ D '/D "or D ═ D"/D ', D ' is usually millimeter (mm), the unit of D "is usually pixel (px), and the conversion of pixel distance to actual distance can be realized by the proportional relationship of D, that is: if D ═ D'/D ", it means that every 1 pixel on the image will appear D millimeters on the printing surface, 1px ═ Dmm;
it should be further noted that the pixel coordinates L ″ of the two-dimensional code or the one-dimensional code, L ″ of L1 ″, L2 ″, L3 ″, shown in fig. 5, can also be determined through analysis of the test image.
As shown in fig. 4 to 6, the job description file includes the pixel coordinates L '(L1', L2 ', L3') of the print area, and the positive or negative of the pixel difference X ═ L '-L "or X ═ L ″ -L', X is calculated in combination with L ″, which determines the left and right direction in which the head moves; if X is L '-L ", X1 is L1' -L1", X2 is L2 '-L2 ", and X3 is L3' -L3".
After X is determined, the offset required by the head can be determined by combining D, and if D ═ D'/D ", y ═ D × X, that is, after the head is offset by y, the head can be aligned with the job description file.
The beneficial effects of the above alternative embodiment are: .
As shown in fig. 7, an inkjet printing plate changing method in an embodiment of the third aspect of the present invention, using an inkjet printing plate aligning apparatus in an embodiment of the first aspect of the present invention, includes the following steps:
step W1, obtaining the pixel coordinate L of the nozzle on the current layout;
step W2, calculating the difference x between the pixel coordinates of the printing range of the new printing job description file and the pixel coordinates of the spray head;
and step W3, calculating the offset y' of the nozzle coordinate by combining the difference x and the proportional relation D, and controlling the nozzle offset.
The beneficial effects of the above alternative embodiment are: when the format is changed, calculating the offset of the nozzle under the new format according to the pixel coordinate of the nozzle on the current layout and the pixel difference value of the printing range of the new job description file and combining the corresponding relation, and controlling the nozzle to move so as to realize quick format change; moreover, if a plurality of nozzles work simultaneously, the connection with each printing range of the operation description file can be established according to the serial numbers of the nozzles, so that the adjustment of the register and the plate change of the plurality of nozzles is realized.
Optionally, as shown in fig. 7, in some embodiments, when the layout of the printed document changes, the offset of the nozzle is calculated according to the difference between the pixel coordinate of the current position of the nozzle and the pixel coordinate of the printing range of the new document, so as to quickly implement the layout of the new document.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
Claims (4)
1. An ink-jet printing plate-changing method, which uses an ink-jet printing plate-aligning device, is characterized in that the ink-jet printing plate-aligning device comprises:
at least one inkjet print head (10);
a displacement device (20) for mounting the inkjet print head (10) and adjusting the coordinates of the inkjet print head (10);
-visual detection means (30) for acquiring a printed image of said inkjet print head (10);
a data processing system (40) for analyzing the printed image and determining a correspondence between actual coordinates of the inkjet print head (10) and pixel coordinates on the printed image;
the control system (50) is used for controlling the printing of the ink-jet printing head (10) and controlling the displacement device (20) to change the position coordinate of the ink-jet printing head (10);
the method specifically comprises the following steps:
step W1, obtaining the pixel coordinate L of the nozzle on the current layout;
step W2, calculating the difference x between the pixel coordinates of the printing range of the new printing job description file and the pixel coordinates of the spray head;
step W3, calculating the offset y' of the nozzle coordinate by combining the difference x and the proportional relation D, and controlling the nozzle to offset; the proportional relation D is the proportional relation between the actual printing width D 'of the nozzle determined by the test image and the pixel width D' on the test image.
2. An inkjet printing plate change method according to claim 1, wherein the actual coordinate of the inkjet print head (10) on the displacement device (20) is Y.
3. An inkjet printing plate change method according to claim 2, wherein the pixel coordinates are based on a printing plate of a job description file.
4. An ink jet printing plate changing method according to claim 1, wherein when the layout of a printed document is changed, the offset of the nozzle is calculated by the difference between the pixel coordinate of the current position of the nozzle and the pixel coordinate of the printing range of the new document, so as to quickly realize the plate alignment of the new document.
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| JPH0768750A (en) * | 1993-04-30 | 1995-03-14 | Hewlett Packard Co <Hp> | Ink jet printing using mask rotation only in end part of page and multipath mode |
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