CN108773182B - Color register control method and system in stable-speed printing process of electronic shaft gravure press - Google Patents
Color register control method and system in stable-speed printing process of electronic shaft gravure press Download PDFInfo
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- CN108773182B CN108773182B CN201810479243.6A CN201810479243A CN108773182B CN 108773182 B CN108773182 B CN 108773182B CN 201810479243 A CN201810479243 A CN 201810479243A CN 108773182 B CN108773182 B CN 108773182B
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Abstract
The invention relates to a color register control method and a system in the steady-speed printing process of an electronic shaft gravure press, wherein the method comprises the following steps: feeding the printing material into a 1 st color group for printing and drying through an unreeling feeding part of an electronic shaft gravure press; the error detection system of the 2 nd color group judges whether the 2 nd color group and the 1 st color group have the color register error, if so, the color register error is calculated to obtain the angular velocity variation of the printing roller of the 2 nd color group, and a control command is sent to a servo motor of the electronic shaft gravure press; the servo motor adjusts the angular speed of the printing plate roller of the 2 nd color group until the color register error is eliminated; and the error detection system of each subsequent color set judges whether a color error exists between the color set and the 1 st color set, and if so, the color error is eliminated according to the color error elimination method of the 2 nd color set. The invention eliminates the coupling influence of the disturbance in the preorder printing unit on the error of the subsequent printing unit during the stable-speed printing, and improves the response speed and the color register precision of the system.
Description
Technical Field
The invention relates to a chromatography control method and a chromatography control system in a low-speed printing process of an electronic shaft gravure press, and belongs to the field of printing control.
Background
In the printing process of the electronic shaft gravure press, the complex pattern to be printed is decomposed into a plurality of simple patterns which are respectively engraved on the printing plate roller, when printing is carried out, the printing material sequentially passes through the printing units through the feeding part, and the printing units print the corresponding simple patterns on the printing material, so that the complex printed pattern is finally obtained. There is a problem of accurate positioning of the corresponding printed pattern between the units during printing, i.e. a problem of register errors. The accuracy of the register is critical to the quality of the product, and therefore, when there is a deviation in the relative positions of the printed patterns during the printing process, a control method is required to reduce or eliminate the positional deviation, i.e., the register error. In view of the influence of the color register accuracy on the product quality, a control method for rapidly reducing or eliminating the color register error becomes important.
The color register control is a very complicated technical problem, and the color register control method is different for different printing modes. The traditional chromatography control method is based on feedforward decoupling fuzzy control of a system mathematical model, but is limited by discretization processing of a high-order equation, so that complete decoupling control cannot be performed on the system. Therefore, the control method cannot achieve the completely decoupled control effect in completely relieving the coupling among the color groups in the system.
Disclosure of Invention
In order to solve the technical problem that the prior art of color register control can not carry out complete decoupling control on the system, the invention provides a color register control method and a system in the process of stable-speed printing of an electronic shaft gravure press, which improve the technical problems of slow response speed and low color register precision in the process of stable-speed printing in the prior art; the coupling influence of the disturbance in the preorder printing unit on the error of the subsequent printing unit during the stable-speed printing is eliminated, and the response speed and the color register precision of the system are improved.
The technical scheme adopted by the color register control method is as follows: a color register control method in the steady-speed printing process of an electronic shaft gravure press comprises the following steps:
s1, feeding the printing material into the 1 st color group through the unreeling feeding part of the electronic shaft gravure press; after the printing material is printed and dried by the 1 st color set, sequentially feeding the printing material into the other color sets for printing and drying;
s2, judging whether the chromatic aberration errors exist in the 2 nd color group and the 1 st color group or not by the error detection system of the 2 nd color group, if so, calculating the chromatic aberration errors of the 2 nd color group and the 1 st color group by the control unit of the 2 nd color group, calculating the angular velocity variation of the printing roller of the 2 nd color group according to the chromatic aberration errors by adopting a decoupling method, and sending a control instruction to a servo motor of the electronic shaft gravure press; the servo motor adjusts the angular speed of the printing plate roller of the 2 nd color group according to the control instruction until the color register error between the 2 nd color group and the 1 st color group is eliminated;
s3, the error detection system of each subsequent color set judges whether there is color error between the color set and the 1 st color set, if so, then the color error between the color set and the 1 st color set is eliminated according to the color error elimination method of the 2 nd color set.
In a preferred embodiment, in step S2, the mathematical model of the color register error and the change amount of the angular velocity of the printing plate roller is:
wherein Ei(s) represents a color register error, i.e., an absolute error, between the printing result of color set i and the printing result of color set 1; wi(s) is the angular velocity variation of the printing plate roller of the ith color group, namely the control quantity of the ith color group; gi(s) a transfer function representing a control quantity of each color set and an error of the color set; hij(s) shows the influence relationship of the control quantity of the jth color set on the ith color set; t is*Tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; k represents the tension coefficient of the printed material, and is a constant; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isi、biIs a variable related to an actual operating parameter of the printing system; c is a constant determined by the physical parameters of the printing system.
In a preferred technical solution, in step S2, the decoupling method is a complete decoupling control method; when the decoupling control is carried out by adopting a complete decoupling fuzzy control method, the expression of the complete decoupling compensation quantity is as follows:
Gfij(s) represents the transfer function of a fully decoupled fuzzy controller to remove the effect of the jth color set on the ith color set, Δ wjPD(s) a fuzzy control quantity of the control unit of the jth color group; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isiIs a variable that is related to the actual operating parameters of the printing system.
The technical scheme adopted by the chromatography control system is as follows: a color register control system in the steady-speed printing process of an electronic shaft gravure press comprises more than 4 color groups, wherein each color group of the electronic shaft gravure press is provided with the color register control system; the color register control system comprises a sensing device and a controller, wherein the sensing device is used for detecting a color register error and sending the color register error to the controller; the controller is used for storing a mathematical model of the chromatography error and the control quantity, calculating the control quantity according to the received chromatography error, and sending the control quantity to a servo motor of the electronic shaft gravure press in a control instruction mode to adjust the angular speed of the printing roller of the color set; wherein the control quantity is the angular speed variation of the printing roller of the color group;
the sensing device of the 2 nd color group judges whether the 2 nd color group and the 1 st color group have color register errors, if so, the controller of the 2 nd color group calculates the color register errors of the 2 nd color group and the 1 st color group, a decoupling method is adopted, the angular speed variation of the printing roller of the 2 nd color group is calculated according to the color register errors, and a control instruction is sent to a servo motor of the electronic shaft gravure press; the servo motor adjusts the angular speed of the printing plate roller of the 2 nd color group according to the control instruction until the color register error between the 2 nd color group and the 1 st color group is eliminated;
and the sensing device of each subsequent color set judges whether a color error exists between the color set and the 1 st color set, and if so, eliminates the color error between the color set and the 1 st color set according to the color error elimination method of the 2 nd color set.
Compared with the prior art, the invention has the following beneficial effects:
the color register control method in the steady-speed printing process of the electronic axis gravure press introduces complete decoupling on the basis of fuzzy control, is still suitable for the conditions of different material penetrating lengths between adjacent color groups, is simple in practical implementation and higher in response speed, and can immediately and effectively remove the coupling effect of the current color group control quantity on the subsequent color groups under the condition of large initial error, thereby quickly eliminating the color difference of the whole system, improving the color register precision and being very suitable for being widely used in the steady-speed printing process of the electronic axis gravure press.
Drawings
FIG. 1 is a flow chart of a process control method according to the present invention;
FIG. 2 is a simplified block diagram of two adjacent color groupings of the electronic spindle gravure press;
FIG. 3 is a system block diagram of a fully decoupled fuzzy control method;
FIG. 4 is an error response curve of the 2 nd color set in this embodiment;
FIG. 5 is the error response curve of the 3 rd, 4 th and 5 th color sets in this embodiment;
FIG. 6 is the error response curve of the 6 th and 7 th color sets in this embodiment;
FIG. 7 is a graph comparing error curves of the 4 th and 5 th color groups of the decoupling method of the present embodiment and the existing feedforward decoupling (decoupling depth is 3) method;
FIG. 8 is a comparison graph of error curves of color groups 6 and 7 of the decoupling method of the present embodiment and the existing feedforward decoupling (decoupling depth is 3) method;
FIG. 9 is a graph of errors of 2, 3, 4 color sets after 2, 3, 4 color disturbances are experimentally given on a printing machine by the decoupling method of the present embodiment;
FIG. 10 is a graph of error curves of 5 th and 6 th color sets after 2, 3 and 4 th color disturbances are experimentally given on a printing machine by the decoupling method of the embodiment;
FIG. 11 is a graph of error curves of the 7 th and 8 th color groups after 2, 3 and 4 th color disturbances are experimentally given on a printing machine by the decoupling method of the embodiment;
fig. 12 is a graph of the error curves of the 9 th color set after the decoupling method of the present embodiment is tested on the printing press and given 2, 3 and 4 color disturbances.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The control system of the gravure press consists of a tension control system and a chromatography control system. The tension control aims at maintaining the tension balance of the winding and unwinding part of the printing equipment so as to avoid the situation that the printing material is wrinkled and broken and lay a foundation for the color register control of the printing unit; the color register control is to eliminate color register error caused by various disturbance factors and improve color register precision and product quality. From the control objective point of view, these two control systems are not identical, but essentially, the core problem they solve is that of tension control. The tension control is to feed back and adjust the speed of the winding and unwinding motor through the tension value detected by the sensor so as to maintain the balance of the tension. A color difference detection device is arranged between printing color groups, and the color register control is to feed back and adjust the speed of a printing plate roller through color difference so as to adjust the tension between the color groups and finally eliminate the color register error.
The electronic shaft gravure press mainly comprises an unreeling feeding part, a printing unit and a discharging and reeling part 3. The unreeling feeding part is used for feeding the printing material into the printing unit from the circular roller of the winding material at a constant linear speed, and a special tension control system is arranged in the unreeling feeding part to ensure the stability of the printing tension. The printing unit is used for sequentially printing the monochromatic patterns on the printing material, a dryer is arranged between each color group, and the material is dried before entering the next printing unit after the printing of the current color is finished so as to prevent the patterns which are printed just from being worn; in order to improve the color register precision, each color group is provided with a color register control system. The discharging and winding part continuously and smoothly collects the printed materials on a winding shaft. Before printing, a complete colour pattern is decomposed into several single-colour negative films, which are then engraved on a circular cylinder to form a printing plate roller. During printing, the unreeling feeding part draws a printing material to the printing unit, the material sequentially passes through each color group to be subjected to monochromatic printing and hot air drying, the material enters the discharging and reeling part after the last color is printed, the material is wound to the reeling shaft by the reeling motor, and printing of a colorful pattern is completed.
As shown in fig. 1, a flowchart of a method for controlling color register of an electronic gravure press during a steady-speed operation according to the present invention includes the following steps:
s1, feeding the printing material into the 1 st color group (also called color group 1) through the unreeling feeding part of the electronic shaft gravure press; and after the printing material is printed and dried by the 1 st color set, sequentially feeding the printing material into the other color sets for printing and drying. Wherein the linear speed at which the printing material is fed into the 1 st color group is a constant value.
S2, printing materials sequentially pass through a control unit of each color set of the electronic axis gravure press to print the color sets of the control unit, an error detection system of a 2 nd color set (also called color set 2) judges whether color set 2 and color set 1 have color register errors, if yes, the control unit of the color set 2 calculates the color register error values of the color set 2 and the color set 1, and under the determined color register accuracy, a complete decoupling fuzzy control method is adopted, the angular velocity variation of a printing roller of the color set 2 is calculated according to the color register error values and is sent to a servo motor of the electronic axis gravure press in a control instruction mode; and the servo motor adjusts the angular speed of the printing plate roller of the color group 2 according to the control instruction until the color register error between the color group 2 and the color group 1 is eliminated.
S3, the error detection system of each subsequent color set judges whether there is color error between the color set and the 1 st color set, if so, then the color error between the color set and the 1 st color set is eliminated according to the color error elimination method of the 2 nd color set.
In this embodiment, the electronic gravure press includes more than 4 color sets, and each color set is provided with a color register control system. The color register control system comprises a sensing device and a controller, wherein the sensing device is a photoelectric eye and is used for detecting a color register error and sending the color register error to the controller; the controller is used for storing a mathematical model of the chromatography error and the control quantity, calculating the control quantity according to the received chromatography error, and sending the control quantity to a servo motor of the electronic shaft gravure press in a control instruction mode to adjust the angular speed of the printing plate roller; wherein the control quantity is the angular velocity variation of the color set printing plate roller. The controller adopts a complete decoupling method for control.
When the printing material passes through the first color set, not only the printed pattern is printed, but also a mark with a specific shape is printed on the edge part of the pattern, if the color register is accurate, the position of the mark actually appearing in the ith color set (also called color set i) is the same as the position of the mark which should theoretically appear; if a difference in position occurs, an error is calculated based on the encoder offset captured for each mark, thereby obtaining the error for color set i. Therefore, the objective of the color register control is to adjust the rotation direction and angle of the printing plate roller so that the encoder calculation error captured for each mark becomes 0.
Meanwhile, based on the characteristics of strong coupling, uncertainty, multi-input multi-output and the like of a printing chromatography system, the chromatography control method adopts an iterative recursion method to obtain a mathematical model of a controlled quantity and a chromatography error, namely the mathematical model of the relation between the angular speed variation of the printing plate roller and the chromatography error, and adjusts the rotation direction and the angle of the printing plate roller through the mathematical model to change the chromatography error in the low-speed printing process. The derivation of the mathematical model is detailed below:
during printing, the color pattern is decomposed into multiple single color patterns, and the multiple single color patterns are divided intoAnd (4) independently printing on different color groups, and when the printing material sequentially passes through each color group along the printing direction, printing a complete picture. FIG. 2 is a simplified block diagram of two adjacent color groupings of the electronic gravure press, where Ti(t) and liRespectively represents the material tension and the material penetration length between the ith color set and the (i + 1) th color set at the moment t, wi(t) denotes the rotational angular velocity of the printing plate roller of the i-th color set at time t, and r denotes the radius of the printing plate roller. In the equilibrium state, i.e. in the absence of a register error between adjacent color sets, the tension between adjacent color sets is denoted T*The angular speeds of rotation of the respective printing rollers are the same and are denoted as w*The material tension and angular velocity at any time can be written in the form of equation (1).
Wherein Δ Ti(t) represents the tension perturbation between the ith and (i + 1) th colour sets at time t, Δ wi(t) represents the amount of change in the angular velocity of the ith patch printing roller at time t, i.e., the amount of control output by the chromatography system controller. The material passing lengths between the adjacent color groups can be equal or different, and the printing plate roller radiuses of the color groups are the same.
The printed material will deform under the influence of an external force. In the elastic range, when the external force is removed, the material can restore to the state similar to the state before stretching. The color register control is based on the scalability of the printed material in the elastic range. The formula (2) shows the deformation of the cross-sectional area of the material under tension.
Wherein A is0And A (T)i) Which represents the cross-sectional area of the material in its natural and stretched state, respectively, and K represents the tension coefficient of the printed material, which is a constant.
According to the formula (2) and the conservation of the mass of the material entering between the two color groups and the material flowing out in unit time, a nonlinear model of the chromatography system can be established, and then the nonlinear model is linearized, so that a linear mechanism model of the chromatography control system of the electronic axis gravure press is obtained, wherein the linear mechanism model is shown as the formula (3):
wherein EiIndicating the color register error of the ith color set.
In the electronic shaft gravure press in actual production, due to the consideration of cost and the difficulty of mechanical realization, it is impossible to install a high-precision tension sensor between each adjacent unit, and thus tension information in the printing process cannot be obtained. From the control point of view, the tension is only used as an intermediate variable described by a model, and the lower part adopts an iterative recursion method to obtain a mathematical relation between the control quantity and the color register error.
The use of the iterative method here is based on the assumption of equation (4):
since the printed indicia of color set 1 is a reference standard, no control is required, and a special tension control system is fed between color sets 1 to maintain tension T0(t) is constant and the control system does not control the plate roll angle speed for color set 1, so the assumption is true.
And (3) performing Laplace transformation on the formula (4), setting the radii of all printing plates to be the same, and recording the radii as r, so as to obtain a dynamic model of the gravure chromatography control system in a frequency domain range, which is shown in a formula (5):
T*tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups;w*the same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; k represents the tension coefficient of the printed material, and is a constant; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isi、biIs a variable related to the actual operating parameters of the printing system and c is a constant determined by the physical parameters of the printing system.
By removing the tension variable in the dynamic model equation (5) based on the hypothetical equation (4), a direct mathematical relationship between the controlled variable and the color register error can be obtained.
In the case of color set 2, let i equal 1 in equation (5) to yield equation (6):
the second equation in equation (6) is the mathematical relationship between the control amount and the color register error of color set 2. Substituting equation (6) into equation (5) for color group 3, and assuming that i in equation (5) is 2, equation (7) is obtained:
by analogy, the mathematical model of the chromatography control system of the ith color group can be obtained by the same method, as shown in the formula (8):
wherein Ei(s) represents a color register error, i.e., an absolute error, between the printing result of color set i and the printing result of color set 1; wi(s) printing plate roller angular velocity of ith color groupThe variation, namely the control quantity of the ith color group; gi(s) a transfer function representing a control quantity of each color set and an error of the color set; hij(s) shows the influence relationship of the control amount of the jth color group on the ith color group.
The invention mainly relates to a color register control method in the process of stable-speed printing, wherein a printing machine has two important characteristics related to color register in a stable-speed running stage, namely, the machine runs in the stable-speed stage instead of an acceleration and deceleration stage; secondly, the machine enters a stable speed running state (stable speed) after being started, and then enters a high speed running state (stable speed) after being accelerated, so that the initial error amplitude of the stable speed running stage is larger and can reach 3mm or even larger. Because the elimination of the error is a dynamic process, the time for eliminating the large error is longer than that for eliminating the small error, so the problem to be solved in the stable-speed running stage is how to eliminate the error quickly, thereby reducing the generation of waste materials.
The color register system is a strong coupling system, and the error of the current color set is adjusted to cause adverse effect on the correction process of the subsequent color set, so that the adjustment time of the subsequent color set is prolonged. Therefore, in order to improve the response speed and shorten the adjustment time, the invention introduces complete decoupling on the basis of the traditional fuzzy control, and inhibits the influence of the disturbance of the front color on the subsequent color set to the maximum extent and the highest efficiency so as to ensure the effectiveness of the complete decoupling method. The complete decoupling fuzzy control algorithm is simple to implement, is suitable for the condition that the material penetrating lengths are different, has high response speed and better color register performance in the stable printing process.
The following derivation process derives complete decoupling control based on formula (10) of a model, and counteracts the influence of the control quantity of the front color set on the subsequent color sets, so that the fuzzy controller is assisted to rapidly eliminate the color register error of each color set on a single loop. Fig. 3 is a system block diagram of the completely decoupled fuzzy control method.
For a specific color set, the control quantity of the previous color set can be regarded as measurable disturbance of the color set, the controller is completely decoupled from acting in advance, and the influence of the disturbance on the color set is restrained to the maximum extent.
In the formula (10)Δ w of (1)i(s) by Δ fij(s), when I is greater than 3, let Ei(s)＝0；
Namely:
from the relationship of the control amount:
substituting the formula into the formula, and sequentially iterating to obtain:
wherein Δ fp ij(s) represents the decoupling compensation amount of the j color disturbance amount (blurring control amount) for i color, instead of the coupling compensation amount of the j color control amount for i color. Correspondingly, when the material penetration lengths of the adjacent color groups are equal, i.e./i＝ljWhen any of i and j is true, the above equation can be transformed as:
when a complete decoupling fuzzy control method is adopted for decoupling, the expression of the complete decoupling compensation quantity is as follows:
Gfij(s) represents the transfer of a fully decoupled controller to decouple the jth color set from the ith color setFunction, Δ wjPD(s) represents the amount of blur control by the control unit of the jth color group.
In industrial application, error data is collected once per revolution of a printing plate roller, and the sampling period is as follows:
the cycle of the controller is also in units of conversion, so that the equations (13) and (14) need to be discretized and then applied to an actual color register control system.
Fig. 4-6 illustrate the error response curves for color sets 2-7 in this example. The error curves of colors 4-7 of the complete decoupling method in the present embodiment are compared with the error curves of the prior feedforward decoupling method, as shown in fig. 7 and 8. The complete decoupling method in this example was tested on a printing press to give error curves for colors 2-9 after 2, 3, 4 color perturbations, as shown in fig. 9-12.
The color register control method in the steady-speed printing process of the electronic axis gravure press introduces complete decoupling on the basis of reestablishing the absolute error model, is simple to implement and high in response speed, and can effectively and completely remove the coupling effect of the current color set control quantity on the subsequent color sets under the condition of large initial error, thereby quickly eliminating the color difference of the whole system, improving the color register precision and being very suitable for being widely used in the steady-speed printing process of the electronic axis gravure press.
As described above, the present invention can be preferably realized. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A color register control method in the steady-speed printing process of an electronic shaft gravure press is characterized by comprising the following steps:
s1, feeding the printing material into the 1 st color group through the unreeling feeding part of the electronic shaft gravure press; after the printing material is printed and dried by the 1 st color set, sequentially feeding the printing material into the other color sets for printing and drying;
s2, judging whether the chromatic aberration errors exist in the 2 nd color group and the 1 st color group or not by the error detection system of the 2 nd color group, if so, calculating the chromatic aberration errors of the 2 nd color group and the 1 st color group by the control unit of the 2 nd color group, calculating the angular velocity variation of the printing roller of the 2 nd color group according to the chromatic aberration errors by adopting a decoupling method, and sending a control instruction to a servo motor of the electronic shaft gravure press; the servo motor adjusts the angular speed of the printing plate roller of the 2 nd color group according to the control instruction until the color register error between the 2 nd color group and the 1 st color group is eliminated;
s3, the error detection system of each subsequent color set judges whether there is color error between the color set and the 1 st color set, if yes, then the color error between the color set and the 1 st color set is eliminated according to the color error elimination method of the 2 nd color set;
in step S2, the mathematical model of the color register error and the change amount of the angular velocity of the printing plate roller is:
wherein Ei(s) represents a color register error, i.e., an absolute error, between the printing result of color set i and the printing result of color set 1; wi(s) is the angular velocity variation of the printing plate roller of the ith color group, namely the control quantity of the ith color group; gi(s) a transfer function representing a control quantity of each color set and an error of the color set; hij(s) shows the influence relationship of the control quantity of the jth color set on the ith color set; t is*For no sleeve between adjacent colour groupsTension between adjacent color groups in the case of color errors; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; k represents the tension coefficient of the printed material, and is a constant; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isi、biIs a variable related to an actual operating parameter of the printing system; c is a constant determined by the physical parameters of the printing system.
2. The method for controlling register in a stationary printing process of an electronic gravure press according to claim 1, wherein the radii of the respective printing plate rollers are the same.
3. The method for controlling the color register of the electronic gravure press during the steady-speed printing process according to claim 1, wherein in step S2, the decoupling method is a complete decoupling fuzzy control method; decoupling control is carried out by adopting a complete decoupling fuzzy control method, and the expression of the complete decoupling compensation quantity is as follows:
Gfij(s) represents the transfer function of a fully decoupled fuzzy controller to remove the effect of the jth color set on the ith color set, Δ wjPD(s) a fuzzy control quantity of the control unit of the jth color group; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isiAs a variable, with printing systemsThe actual operating parameters are relevant.
4. A chromatography control system in the steady-speed printing process of an electronic shaft gravure press comprises more than 4 color groups, and is characterized in that each color group of the electronic shaft gravure press is provided with the chromatography control system; the color register control system comprises a sensing device and a controller, wherein the sensing device is used for detecting a color register error and sending the color register error to the controller; the controller is used for storing a mathematical model of the chromatography error and the control quantity, calculating the control quantity according to the received chromatography error, and sending the control quantity to a servo motor of the electronic shaft gravure press in a control instruction mode to adjust the angular speed of the printing roller of the color set; wherein the control quantity is the angular speed variation of the printing roller of the color group;
the sensing device of the 2 nd color group judges whether the 2 nd color group and the 1 st color group have color register errors, if so, the controller of the 2 nd color group calculates the color register errors of the 2 nd color group and the 1 st color group, a decoupling method is adopted, the angular speed variation of the printing roller of the 2 nd color group is calculated according to the color register errors, and a control instruction is sent to a servo motor of the electronic shaft gravure press; the servo motor adjusts the angular speed of the printing plate roller of the 2 nd color group according to the control instruction until the color register error between the 2 nd color group and the 1 st color group is eliminated;
the sensing device of each subsequent color set judges whether a color error exists between the color set and the 1 st color set, if so, the color error between the color set and the 1 st color set is eliminated according to the color error elimination method of the 2 nd color set;
the mathematical model of the color register error and the control quantity is as follows:
wherein Ei(s) represents a color register error, i.e., an absolute error, between the printing result of color set i and the printing result of color set 1; wi(s) is the angular velocity variation of the printing plate roller of the ith color group, namely the control quantity of the ith color group; gi(s) a transfer function representing a control quantity of each color set and an error of the color set; hij(s) shows the influence relationship of the control quantity of the jth color set on the ith color set; t is*Tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; k represents the tension coefficient of the printed material, and is a constant; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isi、biIs a variable related to an actual operating parameter of the printing system; c is a constant determined by the physical parameters of the printing system.
5. The topping control system of claim 4 wherein the controller uses a complete decoupling method for decoupling control, the expression of the complete decoupling compensation being:
Gfij(s) to releaseTransfer function, Δ w, of a fully decoupled fuzzy controller with the effect of the j color group on the ith color groupjPD(s) a fuzzy control quantity of the control unit of the jth color group; w is a*The same rotating angular speed of each plate roller is obtained under the condition that no color register error exists between adjacent color groups; liThe length of the material passing between the ith color group and the (i + 1) th color group; r is the radius of each printing plate roller; a isiIs a variable that is related to the actual operating parameters of the printing system.
6. The system of claim 4, wherein the sensing device is a photo-eye.
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| CN110143038B (en) * | 2019-05-29 | 2020-12-15 | 宁波欣达印刷机器有限公司 | Method for reducing deformation of easily-stretched material during variable-speed printing and system applying same |
| CN110143039B (en) * | 2019-05-29 | 2020-12-15 | 宁波欣达印刷机器有限公司 | Method and system for gravure printing and marking roller overprinting |
| CN112046148B (en) * | 2020-09-03 | 2022-03-11 | 武汉华茂自动化股份有限公司 | Waste control method and system for gravure printing machine |
| CN113311786B (en) * | 2021-05-06 | 2022-06-03 | 广州大学 | Electronic shaft gravure press chromatography control method, system and medium based on collective identification |
| CN113296474B (en) * | 2021-05-06 | 2022-06-03 | 广州大学 | Chromatography control method, system and device for electronic shaft gravure press and storage medium |
| CN114523756A (en) * | 2022-02-09 | 2022-05-24 | 福建琦峰科技有限公司 | Printing pattern length control method meeting color register stability |
| CN114801431A (en) * | 2022-05-27 | 2022-07-29 | 陕西北人印刷机械有限责任公司 | Primary registration device of satellite type flexible printing press and control method |
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