CN109515019B - Method for adjusting continuous color code overprinting - Google Patents
Method for adjusting continuous color code overprinting Download PDFInfo
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- CN109515019B CN109515019B CN201811462592.3A CN201811462592A CN109515019B CN 109515019 B CN109515019 B CN 109515019B CN 201811462592 A CN201811462592 A CN 201811462592A CN 109515019 B CN109515019 B CN 109515019B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/14—Multicolour printing
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Abstract
The invention provides a method for adjusting continuous color code overprinting, which mainly comprises the steps of carving a corresponding number beside each color code when a printing plate is formulated, and inputting the corresponding relation between each color code and the number on the printing plate and the actual overprinting relation among the color codes into a control system before production; through setting up the camera, after each colour group printing color code, scan whole paper tape by the camera, the image that the camera was shot is cut apart into a plurality of groups version width of cloth by the system according to the version width of cloth girth that sets for, the position of each color code in the same group version width of cloth is discerned to the system, find the color code that needs the overprinting through the discernment serial number, and find the benchmark color code as the position contrast, vertical and horizontal distance between reference color code and the overprinting color code is obtained, compare these two distances and the actual overprinting relation between the colour group again and obtain the error value of overprinting, the system passes through error value adjustment actuating mechanism and accomplishes the overprinting work. The method is not limited by the distance between the two color codes, and can randomly arrange the positions of the color codes according to the typesetting condition, thereby realizing the overprinting work with high precision and high efficiency.
Description
Technical Field
The invention relates to the technical field of overprinting of roll paper, in particular to a method for adjusting continuous color code overprinting.
Background
The web printing equipment is widely applied to the printing industry due to high speed, high efficiency and stable printing quality, the web also has unique personality, the web runs continuously without interruption in the middle, the positions of color groups are required to be aligned, otherwise, the colors and patterns are changed, the position relation between each color group is ensured by a mechanical gripper unlike the condition that a single sheet is not required to be in a mechanical jaw, the web printing cannot be stopped because of the continuity, about 200 meters of material is wasted before and after one stop, the position correspondence between the color groups is very critical, most overprinting systems in the industry are started by machines at present, an operator presses down from a first color gradual color pressing roller at the forefront, then the color is printed on a paper tape, the operator manually moves color patches to be overprinted into a moving door, the operation from the first color to a subsequent color group is required, after all color codes are drawn in the door, because the hardware distance between two scanning heads of the current web overprinting system is 20mm, therefore, overprinting can be started only by manually adjusting the distance between two color codes to be overprinted to be about 20mm, otherwise, the equipment can not identify the color codes, overprinting relation is started on the operation screen for overprinting, after the overprinting is finished, the speed of the machine is increased to start normal production, the mode is that the operation is carried out manually, the speed is low, the speed is fast and invisible, the printing effect is not good under the condition of low speed, and like the equipment with more color groups, the operator needs to run back and forth, even if an operator who is skilled in operation needs to adjust the length of at least 4-5 printing devices each time overprinting is started, overprinting work can be completed, and the mode not only causes high labor intensity of the operator, but also cannot realize accurate overprinting.
Disclosure of Invention
The invention aims to provide a method for adjusting continuous color code overprinting, which can automatically adjust to carry out accurate overprinting by a system regardless of any typesetting sequence and has high efficiency and high accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a method for adjusting continuous color code overprinting, which mainly comprises the following steps:
(1) when a printing plate is made, carving a corresponding number beside each color code to ensure that the numbers corresponding to the color codes in the same printing plate are different;
(2) before production, the corresponding relation between each color code and the serial number on the printing plate and the actual overprinting relation among the color codes need to be input into a control system;
(3) starting from the second color group, arranging cameras at the front ends of the color groups at the rear, and arranging or not arranging cameras at the front end of the first color group as required;
(4) after each color group prints color codes, the whole paper tape is scanned by a camera, an image shot by the camera is divided into a plurality of groups of plate widths by a system according to the set plate width perimeter, in the same group of plate widths, the number of the color codes shot by the first camera is one, the number of the color codes shot by the second camera is two, the number of the color codes shot by the Nth camera is N, and the rest is done in the same way;
(5) the system identifies the position of each color code in the same group of scroll, finds out the color code needing overprinting through the identification number, finds out the reference color code used as position comparison, obtains the longitudinal and transverse distances between the reference color code and the overprinting color code, compares the two distances with the actual overprinting relation between the color groups to obtain the overprinting error value, and transmits the error value to the overprinting executing mechanism which adjusts to complete the overprinting work.
In the above-described embodiment, the printing units of each color group are each provided with an encoder.
In the step (3), if the paper tape is a white cardboard and the first color set is a reference color set, a camera is not required to be arranged at the front end of the first color set.
Further, each camera is provided with a light source.
The invention has the beneficial effects that: the overprinting adjusting method can be adopted to randomly arrange the positions of the color codes according to the typesetting condition of the layout, measure the error required to be adjusted during overprinting through camera identification and positioning, and realize full-automatic high-precision overprinting. According to the method, operators do not need to do any labor force operation and processing, and can complete the overprinting completely and automatically only by inputting the relevant parameters into the control system, so that not only are manpower and material resources saved, but also the production cost is reduced, and the overprinting can be completed at a high speed, and the efficiency is greatly improved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is an image comparison of each version of the invention in the same set of versions.
The specific implementation mode is as follows:
the invention relates to a method for adjusting continuous color mark overprinting, namely, a color mark reading system is additionally arranged among printing color marks, as shown in figure 1, the method mainly comprises a camera, a light source and an encoder, the position of the camera needs to be adjusted firstly, so that color marks can be in the shooting range of the camera, when a printing machine starts to print, the encoder sends a signal to the camera, and the camera starts to adopt images, and the method specifically comprises the following steps:
(1) when the printing plate is formulated, the corresponding number is engraved beside each color code, and the number corresponding to each color code in the same printing plate is ensured to be different.
(2) Before production, the corresponding relation between each color code and the number on the printing plate and the actual overprinting relation between the color codes are input into a control system, for example, the number engraved on the printing plate is 1, the printing is in a fifth color group, and the system knows that the printing is in the fifth color group when recognizing 1; the engraved number on the plate is 3, and when printed, is in the fourth color set, which is known when the system recognizes 3.
(3) And starting from the second color set, arranging cameras at the front ends of the color sets at the rear, arranging light sources on the cameras, and arranging or not arranging the cameras at the front ends of the first color set according to requirements, namely if the paper tape is a white cardboard and the first color set is a reference color set, arranging the cameras at the front ends of the first color set.
(4) After each colour group prints the color code, scan whole paper tape by the camera, the image that the camera was shot is cut apart into a plurality of groups version width of cloth by the system according to the version width of cloth girth that sets for, in same group version width of cloth, the color code that first camera was shot is one, the color code that the second camera was shot is two, the color code that the Nth camera was shot is N, so on, the system can carry out image recognition to all version width of cloth of this version width of cloth internal and handle, can discern the position between each serial number color code.
(5) The system identifies the position of each color code in the same group of scroll, finds out the color code needing overprinting through the identification number, finds out the reference color code used as position comparison, obtains the longitudinal and transverse distances between the reference color code and the overprinting color code, compares the two distances with the actual overprinting relation between the color groups to obtain the overprinting error value, and transmits the error value to the overprinting executing mechanism which adjusts to complete the overprinting work.
In the first layout group overprinting adjustment, all the color scales printed by the first color group are preferably used as reference standards, whether the paper tape is white cardboard or not, the first color scale is usually accurate, and other color scales are compared with the first color scale, so that the error between the distance between the first color scale and the set actual overprinting distance is minimized, the overprinting speed is higher, and the waste is reduced; after the overprinting adjustment of the first layout group is completed, the paper tape enters a normal high-speed overprinting mode, if the paper tape is continuously compared with the first color mark, the accumulated error is gradually increased, and as the overprinting error is minimized through the adjustment of the first layout group, the two color marks in the overprinting sequence are preferably compared in each subsequent layout group, so that the error can be further reduced, the overprinting time is reduced, and the overprinting precision is improved.
As shown in fig. 2, the overprinting sequence is not constant due to the relationship of the pattern design during printing, and the adjustment method of the present invention can be changed according to the actual requirement, and the overprinting relationship is that all the following colors are overprinted with the color scale numbered 1, or the 2 nd color is overprinted with the color scale numbered 1, and the other colors are overprinted with the color scale numbered 2, so that the position between the two color scales corresponding to the sequence can be measured only by inputting the corresponding relationship of the overprinting into the control system.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent modifications of the principles of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for adjusting continuous color code overprinting is characterized by comprising the following steps: the method mainly comprises the following steps:
(1) when a printing plate is made, carving a corresponding number beside each color code to ensure that the numbers corresponding to the color codes in the same printing plate are different;
(2) before production, the corresponding relation between each color code and the serial number on the printing plate and the actual overprinting relation among the color codes need to be input into a control system;
(3) starting from the second color group, arranging cameras at the front ends of the color groups at the rear, and arranging or not arranging cameras at the front end of the first color group as required;
(4) after each color group prints color codes, the whole paper tape is scanned by a camera, an image shot by the camera is divided into a plurality of groups of plate widths by a system according to the set plate width perimeter, in the same group of plate widths, the number of the color codes shot by the first camera is one, the number of the color codes shot by the second camera is two, the number of the color codes shot by the Nth camera is N, and the rest is done in the same way;
(5) the system identifies the position of each color code in the same group of scroll, finds out the color code needing overprinting through the identification number, finds out the reference color code used as position comparison, obtains the longitudinal and transverse distances between the reference color code and the overprinting color code, compares the two distances with the actual overprinting relation between the color groups to obtain the overprinting error value, and transmits the error value to the overprinting executing mechanism which adjusts to complete the overprinting work.
2. The method of adjusting continuous color patch overprinting of claim 1, wherein: and an encoder is arranged in the printing unit of each color group.
3. A method of continuous color patch overprinting adjustment according to claim 1 or 2, wherein: in the step (3), if the paper tape is a white cardboard and the first color set is a reference color set, a camera is not required to be arranged at the front end of the first color set.
4. A method of continuous color patch overprinting adjustment according to claim 3, wherein: each camera is configured with a light source.
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| CN110216996A (en) * | 2019-07-25 | 2019-09-10 | 潍坊东航印刷科技股份有限公司 | More mark tracking auto-alignment systems and more mark tracking register control methods |
| CN111761956A (en) * | 2020-07-20 | 2020-10-13 | 浙江优仆包装有限公司 | Multi-positioning printing method for paperboard color printing |
| CN111942043B (en) * | 2020-08-24 | 2021-11-30 | 重庆宏劲印务有限责任公司 | Secondary offset printing method for realizing high-precision roll-to-roll registration |
| CN112223908B (en) * | 2020-09-28 | 2022-07-01 | 广西真龙实业有限责任公司 | Multicolor printing overprinting auxiliary alignment process |
| CN112356579B (en) * | 2020-11-09 | 2021-09-28 | 北京方正印捷数码技术有限公司 | Printing press control method and device |
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| US3027462A (en) * | 1958-05-22 | 1962-03-27 | Helmes Machf | Apparatus for bringing two moving indicia marks into register with each other |
| CH690096A5 (en) * | 1994-05-25 | 2000-04-28 | Bobst Sa | Rotary polychrome printing machine register monitoring system uses two linear sets of register marks picked up by reading cell |
| CN100526075C (en) * | 2007-01-19 | 2009-08-12 | 长春市吉海测控技术有限责任公司 | Method of using camera to carry out controlling automatic alignment for printing machine |
| DE102011008359B3 (en) * | 2011-01-12 | 2012-02-02 | Lpcon Gmbh | Method for register control with freely selectable marks |
| CN203681008U (en) * | 2014-02-25 | 2014-07-02 | 湖北宜昌龙鼎印务有限公司 | Polychrome printing positioning device |
| CN207683124U (en) * | 2017-12-28 | 2018-08-03 | 长春市吉海测控技术有限责任公司 | A kind of chromatography detection device with camera review identification function |
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Effective date of registration: 20230907 Address after: No. 2700 Changbaishan East Road, Yanji City, Yanbian Korean Autonomous Prefecture, Jilin Province, 130000 Patentee after: YANBIAN CHANGBAISHAN PRINTING Co.,Ltd. Address before: 515000 block A-F, 4a2-2, 2m4, 13-02, Jinyuan Industrial City, Chaoshan Road, Shantou City, Guangdong Province Patentee before: SHANTOU DONGFENG PRINTING Co.,Ltd. Patentee before: YANBIAN CHANGBAISHAN PRINTING Co.,Ltd. |