CN105150681B - A kind of printing machine color density real-time control system and its control method - Google Patents
A kind of printing machine color density real-time control system and its control method Download PDFInfo
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- CN105150681B CN105150681B CN201510628995.0A CN201510628995A CN105150681B CN 105150681 B CN105150681 B CN 105150681B CN 201510628995 A CN201510628995 A CN 201510628995A CN 105150681 B CN105150681 B CN 105150681B
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Abstract
The invention discloses a kind of printing machine color density real-time control system and its control method, its control system is made up of image capturing system, industrial computer system and black amount control system；Image capturing system is made up of standard sources and high-speed industrial camera, when printing finished product arrival, proximity switch action, the camera photograph of triggering high-speed industrial, and view data is transmitted to industrial computer system by Ethernet interface；Industrial computer system includes image processing system and color density control system；Image processing system realizes that the segmentation of printing image and mass parameter are extracted, including color density, color homogeneity, flash and pit these data；Color density control system is worth to the setting value of black amount control system according to color density measured value and standard pattern setting, and color density is stablized by black amount control system regulation ink supply amount.The present invention improves print speed printing speed, improves printing quality and automatization level, reduces the labor intensity of workman.
Description
Technical field
The present invention relates to the technical field of printing machine color density control, refer in particular to a kind of application machine vision and come to print
The printed matter color density of brush machine is measured, realize printing machine color density real-time control system based on data-driven and its
Control method.
Background technology
Domestic printing machine is compared with international advanced product (such as the Heidelberg of Germany), and performance difference is larger, external in printing
There is obvious advantage on the fit precision of machine technological design, part manufacture and each process procedure, this and basic industries and material
It is relevant, it is difficult to catch up with a short time.The maximum performance difference of domestic printing machine and international advanced product is big for color density fluctuation,
Country's solution is exactly to reduce printing machine velocity of rotation at present, and artificial naked eyes judge whether chromaticity is qualified.But influence
The factor of color is a lot, and reduction speed can not be fully solved problem, and also reduce printing efficiency, as restriction printing machine
The big obstacle that rotating speed is improved.The problem of fundamentally solving chromaticity must realize the closed-loop control of color density, build one
Cover efficient color density control system.Current printing machine is universal to be controlled without printing quality on-line checking and color density, if from
This point of penetration sets about making up domestic printing machine in printing machine technological design, part manufacture and each process procedure cooperation essence
Inferior position on degree, catches up with and surpass the international high standards from new technological approaches.
The content of the invention
It is an object of the invention to make up the backward situation of China's printer technology, catch up with and surpass international first from new technological approaches
Enter level there is provided a kind of printing machine color density real-time control system and its control method, the present invention uses machine vision skill
Art is realized and printed matter color density is measured in real time, realizes that printing machine color density is controlled in real time according to the principle of data-driven,
Using digital control technology and LonWorks construction color density numerical control system.
To achieve the above object, its printing machine color density real-time control system of technical scheme provided by the present invention, by
Image capturing system, industrial computer system and black amount control system composition；Described image acquisition system is by standard sources and height
Fast industrial camera composition, when printing finished product arrival, proximity switch action, the camera photograph of triggering high-speed industrial, and picture number
Industrial computer system is transmitted to according to by Ethernet interface；The industrial computer system includes image processing system and color is dense
Spend control system；Described image processing system realizes that the segmentation of printing image and mass parameter are extracted, including color density, color are equal
Even property, flash and pit these data, color density are used to control in real time, and other data are used for fault diagnosis；The color is dense
Degree control system is worth to the setting value of black amount control system according to color density measured value and standard pattern setting, is controlled by ink amount
System fading margin ink supply amount processed stablizes color density.
The industrial computer system uses industrial panel computer, with 2 Ethernet interfaces, and ink amount control is connected respectively
System and image capturing system, image procossing and color density control algolithm are on the platforms of Windows 7 of industrial platform computer
Realized using C# language.
The black amount control system is realized using PLC and servo drive system and black control valve door, using with industry
The siemens PLC SMART of Ethernet interface, and be connected using its high-speed pulse output with servo drive system.
The control method of printing machine color density real-time control system of the present invention is as follows：
The control of printing color concentration uses serials control, in the main feedback loop of serials control, and industrial computer system leads to
Cross after the image that image capturing system is obtained after printed matter processing, the color image segmentation and color by image processing system are dense
Degree is extracted, and obtains the concentration data of every kind of color；The color density control system of industrial computer system is surveyed according to color density
The difference of value and standard value, the corner setting value for obtaining after over-richness control algolithm servo structure, are realized on slave computer PLC
Black amount control system be serials control inner ring, inner ring use semiclosed loop SERVO CONTROL, its feedback quantity be servomotor corner；
For flexo, servomotor corner be respectively control anilox roll and forme roller spacing servomotor corner and control forme roller and
The servomotor corner of roller platen spacing；For offset printing, servomotor corner is control ink fountain and the servo electricity of ink foundation roller spacing
The servomotor corner of machine corner and control ink fountain corner, flexo and offset printing all improve ink amount output using two sets of servo-drive systems
Adjustable range；Color density control system is controlled using increment amplitude limit PI, and increment amplitude limit value takes in two sets of servo-drive systems and most connect
Near controlling increment is the minimum equivalent of corner, and its controlling cycle is five times of lag time and color density regulation transient process
After end, then next periodic adjustment is carried out, overcome large time delay and the time_varying delay influence of color density control loop；Ink amount control system
System uses low pass filter, it is ensured that color smooth transition, reduces overshoot and produces.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, the tandem closed-loop control system scheme of the printing color concentration based on machine vision and data-driven is realized, is overcome
Influence of the factors such as ink viscosity, print speed printing speed, environment temperature to color density, realizes and is ensureing the premise of printing quality
Under, print speed printing speed is improved, printing quality and automatization level is improved, the labor intensity of workman is reduced.
2nd, give the color density control system implementation method based on EPA, realize printing machine digitlization and
Networking is controlled in real time.Live line, reduction failure are reduced using EPA, system reliability and maintainability, work is improved
Application of the industrial Ethernet in printing machine ink feeding system will be that printing machine total digitalization and networking lay the foundation, and most realize at last
Printing machine upgrades.
3rd, the adjustable range of ink amount output is improved using two sets of servo-drive systems, black amount control system uses LPF
Device, it is ensured that color smooth transition, reduces overshoot and produces.
Brief description of the drawings
Fig. 1 is press structure principle sketch.
Fig. 2 is the schematic diagram of color density serials control.
Embodiment
With reference to specific embodiment, the invention will be further described.
As shown in figure 1, the angle from ink amount control gives press structure principle sketch, product (such as label paper) to be printed
Enter printing machine from the left side, after multiplex priting process, printing finished product (such as label design) is obtained from the right.It is of the present invention
Printing machine color density real-time control system is made up of image capturing system, industrial computer system and black amount control system.Figure
As acquisition system is made up of standard sources and high-speed industrial camera, when printing finished product arrival, proximity switch action, triggering industry
Camera is taken a picture, and view data is transmitted to industrial computer system by Ethernet interface.Industrial computer system is using industry
Tablet personal computer, with 2 Ethernet interfaces, connects black amount control system and image capturing system respectively.Image procossing and color
Concentration control algolithm realizes that image processing system realizes print on the platforms of Windows 7 of industrial platform computer using C# language
Map brushing picture is split and mass parameter is extracted, including the data such as color density, color homogeneity, flash and pit, and color density is used
In real-time control, other data are used for fault diagnosis；Color density control system is according to color density measured value and standard pattern
Setting is worth to the setting value of black amount control system, and color density is stablized by black amount control system regulation ink supply amount.Whole print
The color density control system of brush machine is by the color density control algolithm in industrial computer system and multiple black amount control systems
Composition, using EPA connection between them.Each ink amount control system represents a kind of control of individual color, general one
Platform rotary press has the printing link of 7 or so, then has 7 black amount control systems.Black amount control system uses PLC and servo
Drive system and black control valve door are realized, using siemens PLC SMART (having EPA interface), and use it
High-speed pulse output is connected with servo drive system, it is possible to achieve inexpensive SERVO CONTROL.
As shown in Fig. 2 the control of printing color concentration uses serials control, it is to be printed in the main feedback loop of serials control
Material obtains printing finished product by printing process, and industrial computer system completes printing finished product chromaticity diagram by image capturing system
After collection, extracted by color image segmentation and color density, obtain the concentration measurement of every kind of color.Industrial computer system
Difference of the color density control system of system according to color density measured value and standard value, the control by its color density controller
The corner value setting value of two servo structures is obtained after algorithm.The black amount control system realized on slave computer PLC is tandem control
The inner ring of system, inner ring uses semiclosed loop SERVO CONTROL, and its feedback quantity is servomotor corner, rather than black measurement.For
Flexo, servomotor corner be respectively control anilox roll and forme roller spacing servomotor corner φ 1 and control forme roller and
The servomotor corner φ 2 of roller platen spacing；For offset printing, servomotor corner is control ink fountain and the servo of ink foundation roller spacing
Motor corner φ 1 and control ink fountain corner servomotor corner φ 2, the tune of ink amount output is improved using two sets of servo-drive systems
Adjusting range, total adjustable range is：
φ=k1* φ 1+K2* φ 2
Wherein, k1 and K2 is the ink amount adjustment factor of printing machine, and for the printing machine of certain structure, the coefficient is known.
Two sets of corner φ 1 and φ 2 inner ring control loop uses identical structure, and black amount controller is siemens PLC SMART types
PLC, servo structure is stepper motor and its driver, and outer corner measurement is plastic potentiometer, using PLC high-speed pulse output I/
O is connected with stepper motor driver.
Due to printing machine, per procedure, from measurement point position, the print speed printing speed of different and printing machine is change, there is color
Measurement delay；Ink is different because of its different viscosity flow velocity, there is control delayed；In order to adjust steady and reduction servo
Mechanism wear, color density controller is controlled using the PI of controlling increment amplitude limit, and increment amplitude limit value is taken in two sets of servo-drive systems most
The minimum equivalent of close controlling increment (corner), its controlling cycle is five times of lag time and color density was adjusted and tided over
After journey terminates, then carry out next periodic adjustment, the large time delay that color density control loop is overcome with this and time_varying delay influence.Mo Liang
Controller uses low pass filter, it is ensured that color smooth transition, reduces overshoot and produces.
Examples of implementation described above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
Enclose, therefore the change that all shape, principles according to the present invention are made, it all should cover within the scope of the present invention.
Claims (4)
1. a kind of printing machine color density real-time control system, it is characterised in that：By image capturing system, industrial computer system
With black amount control system composition；Described image acquisition system is made up of standard sources and high-speed industrial camera, when printing finished product is arrived
When coming, proximity switch action, the camera photograph of triggering high-speed industrial, and view data is transmitted to industrial calculating by Ethernet interface
Machine system；The industrial computer system includes image processing system and color density control system；Described image processing system
Realize that the segmentation of printing image and mass parameter are extracted, including color density, color homogeneity, flash and pit these data, color
Color concentration is used to control in real time, and other data are used for fault diagnosis；The color density control system is measured according to color density
Value and standard pattern setting are worth to the setting value of black amount control system, and color is stablized by black amount control system regulation ink supply amount
Concentration.
2. a kind of printing machine color density real-time control system according to claim 1, it is characterised in that：The industry meter
Calculation machine system uses industrial panel computer, and with 2 Ethernet interfaces, black amount control system and IMAQ system are connected respectively
System, image procossing and color density control algolithm are realized on the platforms of Windows 7 of industrial platform computer using C# language.
3. a kind of printing machine color density real-time control system according to claim 1, it is characterised in that：The ink amount control
System processed is realized using PLC and servo drive system and black control valve door, using the Siemens with EPA interface
S7-200SMART, and be connected using its high-speed pulse output with servo drive system.
4. the control method of printing machine color density real-time control system described in a kind of claim 1, it is characterised in that：Process color
Color concentration control uses serials control, and in the main feedback loop of serials control, industrial computer system passes through image capturing system
Obtain after the image after printed matter processing, the color image segmentation and color density by image processing system are extracted, and obtain every
Plant the concentration data of color；The color density control system of industrial computer system according to color density measured value and standard value it
Difference, the corner setting value for obtaining after over-richness control algolithm servo structure, the black amount control system realized on slave computer PLC
For the inner ring of serials control, inner ring uses semiclosed loop SERVO CONTROL, and its feedback quantity is servomotor corner；For flexo, servo
Motor corner is respectively the servomotor corner and control forme roller and roller platen spacing for controlling anilox roll and forme roller spacing
Servomotor corner；For offset printing, servomotor corner and control of the servomotor corner for control ink fountain with ink foundation roller spacing
The servomotor corner of ink fountain corner, flexo and offset printing all improve the adjustable range of ink amount output using two sets of servo-drive systems；
Color density control system is controlled using increment amplitude limit PI, and increment amplitude limit value takes immediate controlling increment in two sets of servo-drive systems
That is the minimum equivalent of corner, after its controlling cycle terminates for five times of lag time and color density regulation transient process, then enters
The next periodic adjustment of row, overcomes large time delay and the time_varying delay influence of color density control loop；Black amount control system uses low pass
Wave filter, it is ensured that color smooth transition, reduces overshoot and produces.
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| US5967050A (en) * | 1998-10-02 | 1999-10-19 | Quad/Tech, Inc. | Markless color control in a printing press |
| JP4276046B2 (en) * | 2003-10-30 | 2009-06-10 | 株式会社小森コーポレーション | Method and apparatus for adjusting ink supply amount of printing press |
| JP2008114465A (en) * | 2006-11-02 | 2008-05-22 | Mitsubishi Heavy Ind Ltd | Ink controlling device, printing machine and printing method |
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