CN110802945A - Color register control method and system in stable-speed printing process of mechanical shaft gravure press - Google Patents
Color register control method and system in stable-speed printing process of mechanical shaft gravure press Download PDFInfo
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Abstract
The invention belongs to the technical field of printing control, and discloses a color register control method and a system in a stable-speed printing process of a mechanical shaft gravure press, which comprises a printing unit for printing corresponding color groups; judging whether a color register error exists by an error detection system of the printing unit i; if the color register error exists, calculating a color register error value, calculating and obtaining the longitudinal linear velocity variation of the compensating roller between the printing unit (i-1) and the printing unit i according to the obtained color register error value and the control quantity of the preorder compensating roller according to a control calculation formula designed by the model according to the Lyapunov stability analysis method under the determined color register accuracy, and correspondingly adjusting until the color register errors of the color group of the printing unit i and the color group of the printing unit 1 are eliminated. According to the invention, a control algorithm is designed by adopting a Lyapunov analysis method according to a mathematical model of a mechanical axis, so that the printing error in the stable-speed printing process is eliminated, and the response speed and the color register precision of the system are improved.
Description
Technical Field
The invention belongs to the technical field of printing control, and particularly relates to a color register control method and system for a mechanical shaft gravure press in a stable-speed printing process.
Background
Currently, the current state of the art commonly used in the industry is such that: in the printing process of the mechanical 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 method commonly used in industry maintains the control accuracy at about + -0.15 mm.
In summary, the problems of the prior art are as follows: in the prior art, the response speed in the stable-speed printing process is low, the color register precision is not high, and for different material penetrating length conditions of a mechanical shaft, no coping control strategy is given by the existing model-based control scheme.
The difficulty of solving the technical problems is as follows: the scheme is that the influence of different material penetration lengths on the control scheme is firstly researched, so that the control scheme is set according to the different material penetration lengths. How to deduce the stability of the proof scheme from theory is secondly.
The significance of solving the technical problems is as follows: the accuracy of the chromatography printing system is improved, the actual chromatography significance (chromatography printing based on the first color) of the printing industry is better met, and the universality of the control scheme is improved, namely the chromatography printing system is still applicable to chromatography printing systems under the conditions of unequal material wearing lengths.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a color register control method and system in the stable-speed printing process of a mechanical shaft gravure press.
The invention is realized in this way, a color register control method in the steady-speed printing process of a mechanical shaft gravure press, which specifically comprises the following steps:
firstly, sequentially passing a printing material through a mechanical shaft gravure press comprising i printing units, and printing corresponding color groups on each printing unit; wherein i is greater than or equal to 2;
step two, an error detection system of the printing unit i judges whether a color set of the printing unit i and a color set of the printing unit 1 have color register errors;
step three, if the color register error exists, the control system of the color group of the printing unit i calculates the color register error value of the printing unit i and the color group of the printing unit 1, calculates the longitudinal linear velocity variation of the compensating roller between the printing unit (i-1) and the printing unit i according to the color register error value and the control quantity of the preorder compensating roller according to a control calculation formula designed by a model according to a Lyapunov stability analysis method under the determined color register accuracy, and sends the longitudinal linear velocity variation to a servo motor of the mechanical axis gravure press in a control instruction mode;
step four, the servo motor receives a control instruction, and adjusts the longitudinal linear velocity of a compensating roller between the printing unit (i-1) and the printing unit i according to the control instruction until the color register error of the color group of the printing unit i and the color group of the printing unit 1 is eliminated;
and step five, repeating the step two to the step four until errors between all color groups of the printing units of the mechanical axis gravure press and the color group of the printing unit 1 are eliminated.
Further, in the second step, the color register error specifically includes: the color register error is the color register error between each printing unit color set and the printing unit 1 color set.
Further, the mathematical model of the color register error and the change amount of the longitudinal linear velocity of the compensation roller among the color groups is as follows:
in the above model, ei(t) is the register error between the ith and first burst print cursors, Vi(T) is the control quantity, Δ T, of the longitudinal linear velocity of the compensating roll between color set i and color set (i +1)i(T) represents the length of material between color set i and color set (i +1), T*Tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups; omega is the rotating angular speed of each printing plate roller 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;
the length of the material to be penetrated is the length of the material to be penetrated under the condition of no overprint error between the color group i and the color group (i + 1); r is the radius of each printing plate roller.
Further, the lyapunov stability analysis method specifically comprises the following steps:
derivation of the above equation yields:
wherein epsiloni(t) is a variable when ei(t) convergence to 0 ∈i(t) also converges to 0; then the lyapunov energy function:
by deriving the energy function, when the control formula is:
the derivative of the energy function is:
further, the control calculation formula designed according to the model and the Lyapunov stability analysis method is as follows:
further, the color register control method is based on the control method under the condition of absolute error, namely the printing error of the printing result of the current printing unit relative to the printing result of the first printing unit, but the color register control method can also be applied to the corresponding derivation of the control method under the condition of relative error, namely the printing error of the printing result of the current printing unit relative to the printing result of the previous printing unit of the current printing unit;
meanwhile, the color register control method comprises but is not limited to absolute error control and relative error control.
Another object of the present invention is to provide a color register control system for a mechanical axis gravure press in a stable speed printing process, which applies the color register control method for a mechanical axis gravure press in a stable speed printing process, and specifically includes:
a tension control module: the tension sensor is arranged on the winding and unwinding part and used for detecting a tension value to feed back and adjust the speed of the winding and unwinding motor to maintain the tension balance of the winding and unwinding part of the printing equipment, so that the situations that a printing material is folded and is broken are avoided;
a color register control module: the color difference detection device is arranged between the printing color groups to detect color difference, and the longitudinal linear speed of the compensation roller is adjusted through color difference feedback, so that the tension between the color groups is adjusted, color register errors caused by various disturbance factors are eliminated, and the color register precision and the product quality are improved.
Another object of the present invention is to provide a mechanical axis gravure press equipped with a color register control system in a steady printing process of the mechanical axis gravure press, the mechanical axis gravure press comprising:
the mechanical shaft gravure press comprises an unreeling feeding part, a printing unit and a discharging and reeling part;
unreeling and feeding part: the printing unit is used for feeding the printing material into the printing unit from the round roller for winding the material at a constant linear speed, and meanwhile, the tension control module is arranged to ensure the stability of printing tension;
a printing unit: used for printing the single-color pattern on the printing material in sequence;
a discharging and winding part: for continuous and smooth collection of printed material onto a take-up spool.
Further, the printing unit specifically includes:
the printing unit comprises a plurality of color sets; a dryer is arranged between each color group and is used for drying the materials before the materials are printed in the current color and then enter the next printing unit; the material penetrating lengths of the color groups can be the same or different;
a compensating roller (a compensating roller between units) is also arranged between the two color groups, and the radiuses of the compensating rollers are the same;
the printing unit also comprises a corresponding color register control device.
Further, the color register control device specifically includes:
the color register control device comprises a sensing device and a controller;
the sensing device comprises: is a photoelectric eye; the controller is used for detecting the color register error and sending the detected color register error to the controller;
a controller: and the servo motor is used for calculating a control quantity, namely the longitudinal linear velocity variation of the compensation rollers among the color groups according to a control calculation formula designed by the Lyapunov stability analysis method based on the model and the received color register error and the control quantity of the preorder color groups, and sending the control quantity to the mechanical axis gravure press in a control instruction mode.
The invention also aims to provide an information data processing terminal for realizing the color register control method in the stable-speed printing process of the mechanical shaft gravure press.
Another object of the present invention is a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the method for controlling register in a constant-speed printing process of a mechanical gravure press.
In summary, the advantages and positive effects of the invention are: according to the invention, a control algorithm is designed by adopting a Lyapunov analysis method according to a mathematical model of a mechanical axis, so that the printing error in the stable-speed printing process is eliminated, and the response speed and the color register precision of the system are improved.
The color register control method in the stable-speed printing process of the mechanical axis gravure press introduces a Lyapunov stability analysis method on the basis of a mechanical axis mathematical model, so that the effectiveness of the control method is theoretically proved, and the comparison with the industrial existing method proves that the control method provided by the invention has high response speed, can effectively and quickly eliminate the color difference of the whole system, improves the color register precision, and is very suitable for being widely used in the stable-speed printing process of the mechanical axis gravure press.
The invention provides a color register control method in a stable-speed printing process of a mechanical shaft gravure press, which solves the technical problems of low response speed and low color register precision in the stable-speed printing process in the prior art.
Drawings
Fig. 1 is a flowchart of a process control method for a mechanical axis gravure press during a steady-speed printing process according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a color register control method in a constant-speed printing process of a mechanical axis gravure press according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a color register control system in a steady-speed printing process of a mechanical axis gravure press according to an embodiment of the present invention.
In the figure: 1. a tension control module; 2. and a color register control module.
FIG. 4 is a graph comparing the output of the mechanical axis model and the actual system output provided by the embodiment of the invention.
Fig. 5 is a schematic diagram of an error response curve of the color set 2 in the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 6 is a schematic diagram of error response curves of color sets 3 and 4 in the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 7 is a schematic diagram of error response curves of color sets 5, 6, and 7 of the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 8 is a schematic diagram of an error comparison curve between the color set 2 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of an error comparison curve between the color set 3 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
Fig. 10 is a schematic diagram of an error comparison curve between the color set 4 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, the response speed in the stable printing process is low and the color register precision is not high.
To solve the above technical problems, the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the method for controlling color register in the steady-speed printing process of the mechanical gravure press provided by the embodiment of the present invention specifically includes:
s101, sequentially passing a printing material through a mechanical shaft gravure press comprising i printing units, and printing corresponding color groups by each printing unit; wherein i is greater than or equal to 2.
S102, the error detection system of the printing unit i judges whether the color set of the printing unit i and the color set of the printing unit 1 have color register errors.
S103, if the color register error exists, the control system of the color group of the printing unit i calculates the color register error value of the printing unit i and the color group of the printing unit 1, calculates the longitudinal linear velocity variation of the compensating roller between the printing unit (i-1) and the printing unit i according to the color register error value and the control quantity of the preorder compensating roller according to a control calculation formula designed by a model according to a Lyapunov stability analysis method under the determined color register accuracy, and sends the longitudinal linear velocity variation to the servo motor of the mechanical axis gravure press in a control instruction mode.
And S104, the servo motor receives the control command and adjusts the longitudinal linear velocity of the compensating roller between the printing unit (i-1) and the printing unit i according to the control command until the color register error of the color group of the printing unit i and the color group of the printing unit 1 is eliminated.
And S105, repeating the steps S102 to S104 until errors between all color groups of the printing units of the mechanical axis gravure press and the color group of the printing unit 1 are eliminated.
Fig. 2 is a principle of a process color control method in a constant-speed printing process of a mechanical axis gravure press according to an embodiment of the present invention.
In step S102, the color register error provided in the embodiment of the present invention specifically includes: the color register error is the color register error between each printing unit color set and the printing unit 1 color set.
The mathematical model of the color register error and the change quantity of the longitudinal linear velocity of the compensating roller among color groups provided by the embodiment of the invention is as follows:
in the above model, ei(t) is the register error between the ith and first burst print cursors, Vi(t) is colorThe longitudinal linear velocity of the compensating roll between group i and color group (i +1) is the controlled variable, Δ Ti(T) represents the length of material between color set i and color set (i +1), T*Tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups; omega is the rotating angular speed of each printing plate roller 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;
the length of the material to be penetrated is the length of the material to be penetrated under the condition of no overprint error between the color group i and the color group (i + 1); r is the radius of each printing plate roller.
The method for analyzing the stability of Lyapunov provided by the embodiment of the invention specifically comprises the following steps:
derivation of the above equation yields:
wherein epsiloni(t) is a variable when ei(t) convergence to 0 ∈i(t) also converges to 0; then the lyapunov energy function:
by deriving the energy function, when the control formula is:
the derivative of the energy function is:
the control calculation formula designed according to the model and the Lyapunov stability analysis method provided by the embodiment of the invention is as follows:
the color register control method provided by the embodiment of the invention is based on the absolute error, namely the control method under the condition of the printing error of the printing result of the current printing unit relative to the printing result of the first printing unit, but the color register control method can also be suitable for the corresponding derivation of the relative error, namely the printing error of the printing result of the current printing unit relative to the printing result of the previous printing unit of the current printing unit and the corresponding control method.
Meanwhile, the color register control method comprises but is not limited to absolute error control and relative error control.
As shown in fig. 3, the color register control system in the steady-speed printing process of the mechanical gravure press provided by the embodiment of the present invention specifically includes:
a tension control module: the tension sensor used for detecting tension and arranged on the winding and unwinding part is used for detecting a tension value to feed back and adjust the speed of the winding and unwinding motor to maintain the tension balance of the winding and unwinding part of the printing equipment, and the situation that printed materials are wrinkled and broken is avoided.
A color register control module: the color difference detection device is arranged between the printing color groups to detect color difference, and the longitudinal linear speed of the compensation roller is adjusted through color difference feedback, so that the tension between the color groups is adjusted, color register errors caused by various disturbance factors are eliminated, and the color register precision and the product quality are improved.
The mechanical shaft gravure press provided by the embodiment of the invention comprises:
the mechanical shaft gravure press comprises an unreeling feeding part, a printing unit and an ejection of compact rolling part.
Unreeling and feeding part: the printing unit is used for feeding printing materials into the printing unit from a circular roller for winding the materials at a constant linear speed, and meanwhile, a tension control module is arranged to ensure the stability of printing tension.
A printing unit: for sequentially printing the monochromatic patterns on the printing material.
A discharging and winding part: for continuous and smooth collection of printed material onto a take-up spool.
The printing unit provided by the embodiment of the invention specifically comprises:
the printing unit comprises a plurality of color sets; a dryer is arranged between each color group and is used for drying the materials before the materials are printed in the current color and then enter the next printing unit; the lengths of the materials penetrated among the color groups can be the same or different.
And a compensating roller is also arranged between the two color groups, and the radius of the compensating roller is the same.
The printing unit also comprises a corresponding color register control device.
The color register control device provided by the embodiment of the invention specifically comprises:
the color register control device comprises a sensing device and a controller.
The sensing device comprises: is a photoelectric eye; for detecting the color error and sending the detected color error to the controller.
A controller: and the servo motor is used for calculating a control quantity, namely the longitudinal linear velocity variation of the compensation rollers among the color groups according to a control calculation formula designed by the Lyapunov stability analysis method based on the model and the received color register error and the control quantity of the preorder color groups, and sending the control quantity to the mechanical axis gravure press in a control instruction mode.
The present invention will be further described with reference to the following specific examples.
Example 1:
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 color register control is to adjust the longitudinal linear velocity of a compensation roller through color difference feedback, further adjust the tension between the color groups and finally eliminate color register errors.
The mechanical 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 round roller of the winding material at a constant linear speed, and a special tension control system is arranged at 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 the printing of the current color is finished and then enters the next printing unit so as to prevent the patterns printed just before being worn; in order to improve the color register precision, each color group is provided with a color register control system, and the discharging and winding part continuously and smoothly collects 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. 2, a flow chart of a color register control method of a mechanical axis gravure press in a steady-speed operation process of the present invention includes the following contents:
and constructing a Lyapunov energy function according to the mathematical model of the mechanical shaft, analyzing the Lyapunov energy function and the mathematical model, and deducing to obtain a control formula for ensuring the stability of the system.
A new error definition is made for the mechanical axis printer and mathematical modeling is performed. Feeding the printing material into the color group 1 through the feeding part of the mechanical shaft gravure press; and the printing material is printed and dried by the color group 1 and then sequentially sent to the other color groups for printing and drying.
In the embodiment, a printing material sequentially passes through each control unit of a mechanical axis gravure press to print color sets of the unit, an error detection system of the color set i judges whether color set i and the color set 1 have color register errors, if so, the control system of the color set i calculates the color register error values of the color set i and the color set 1, and under the determined color register precision, based on the control method provided by the invention, the longitudinal linear velocity of a compensating roller between the color set i-1 and the color set i is calculated according to the color register error values and is sent to a servo motor of the mechanical axis gravure press in a control instruction mode; the servo motor receives and adjusts the longitudinal linear velocity of the compensating roller between the color group i-1 and the color group i according to the control instruction until the color register error of the color group i is eliminated; and the color set error detection system judges whether color set and color set 1 have color error, if so, the method is adopted to eliminate the error between the color set and the color set 1.
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, and the sensing device is a photoelectric eye; the controller is used for storing calculation formulas of the color register error and the control quantity, calculating the control quantity of the unit according to the received color register error and the control quantity of the preorder unit, and sending the control quantity to the servo motor of the mechanical shaft gravure press in a control instruction mode to adjust the longitudinal linear speed of the compensating roller; the control quantity is the longitudinal linear speed of the compensating roller among the color groups.
When the printed material passes through the first color set, not only the printed pattern but also a mark of a specific shape is printed on the edge portion of the pattern, if the color register is accurate, the position where the cursor actually appears in the color set i should be the same as the position where the cursor theoretically should appear, and if different, the error is calculated according to the encoder deviation when each mark is captured. Thereby obtaining an error of the color set i, and therefore, the objective of the color register control is to make the encoder calculation error at each time of mark capture 0 by adjusting the longitudinal linear velocity and direction of the compensating roll.
Meanwhile, based on the characteristics of strong coupling, large pure hysteresis, uncertainty, multi-input multi-output and the like of a printing chromatography system, the derived control type theoretically provides a proof of system stability and derives a control type for converging a closed-loop system. The derivation process of the control is detailed below:
the mathematical model of the mechanical axis is given as follows:
wherein e isiIndicating the color register error of the ith color set.
Defining:
(1) formula (2) can be rewritten as:
ei(t)＝cΔTi-1(t) (6)
ΔTi(t)＝ai(ΔTi-1(t)-ΔTi(t))+biVi(t) (7)
in the mechanical shaft gravure press in practical production, due to the consideration of cost and the difficulty in 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 a control point of view, the tension is only used as an intermediate variable described by a model, and the relation between the error and the longitudinal linear speed of the compensating roller can be iteratively obtained. Based on the above mathematical model, the following equation can be written:
wherein epsiloni(t) is a variable when ei(t) convergence to 0 ∈i(t) also converges to 0. Lambda [ alpha ]iIs an arbitrary positive number greater than 0. For formula (8) and (9) in which epsiloni(t) derivation:
wherein muiAlso an arbitrary positive number greater than 0. (10) The second part of the equation can be written as:
when the control quantity Vi-1(t) is:
(11) the formula is equal to 0, and the simultaneous radicals (8), (9), (10) result in:
constructing a lyapunov energy function:
the derivation can be:
from the formula (16), it can be seen thati(t)＞0，εi(t)＞0，λi＞0andμiThe formulas (16) are strictly less than or equal to 0, so that the control formula (12) provided by the invention can lead the system to be globally stable based on the Lyapunov stability theory.
The color register control method in the stable-speed printing process of the mechanical axis gravure press introduces a Lyapunov stability analysis method on the basis of a mechanical axis mathematical model, so that the effectiveness of the control method is theoretically proved, and the comparison with the industrial existing method proves that the control method provided by the invention has high response speed, can effectively and quickly eliminate the color difference of the whole system, improves the color register precision, and is very suitable for being widely used in the stable-speed printing process of the mechanical axis gravure press.
The invention is further described below in connection with specific experiments.
FIG. 4 is a graph comparing the output of the mechanical axis model and the actual system output provided by the embodiment of the invention.
Fig. 5 is a schematic diagram of an error response curve of the color set 2 in the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 6 is a schematic diagram of error response curves of color sets 3 and 4 in the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 7 is a schematic diagram of error response curves of color sets 5, 6, and 7 of the method for controlling the color register of the mechanical axis gravure press according to the embodiment of the present invention.
Fig. 8 is a schematic diagram of an error comparison curve between the color set 2 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of an error comparison curve between the color set 3 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
Fig. 10 is a schematic diagram of an error comparison curve between the color set 4 of the mechanical axis gravure press chromatography control method and the industrial empirical PD control method according to the embodiment of the present invention.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A color register control method in the speed-stabilizing printing process of a mechanical shaft gravure press is characterized by comprising the following steps of:
firstly, sequentially passing a printing material through a mechanical shaft gravure press comprising i printing units, and printing corresponding color groups on each printing unit; wherein i is greater than or equal to 2;
step two, an error detection system of the printing unit i judges whether a color set of the printing unit i and a color set of the printing unit 1 have color register errors;
step three, if the color register error exists, the control system of the color group of the printing unit i calculates the color register error value of the printing unit i and the color group of the printing unit 1, calculates the longitudinal linear velocity variation of the compensating roller between the printing unit (i-1) and the printing unit i according to the color register error value and the control quantity of the preorder compensating roller according to a control calculation formula designed by a model according to a Lyapunov stability analysis method under the determined color register accuracy, and sends the longitudinal linear velocity variation to a servo motor of the mechanical axis gravure press in a control instruction mode;
step four, the servo motor receives a control instruction, and adjusts the longitudinal linear velocity of a compensating roller between the printing unit (i-1) and the printing unit i according to the control instruction until the color register error of the color group of the printing unit i and the color group of the printing unit 1 is eliminated;
and step five, repeating the step two to the step four until errors between all color groups of the printing units of the mechanical axis gravure press and the color group of the printing unit 1 are eliminated.
2. The method for controlling the color register in the process of the mechanical shaft gravure press for the steady-speed printing according to claim 1, wherein in the third step, the method for analyzing the stability of the Lyapunov specifically comprises:
the above formula is derived:
wherein epsiloni(t) is a variable when ei(t) convergence to 0 ∈i(t) also converges to 0; then the lyapunov energy function:
deriving the energy function, when the control formula is:
the derivative of the energy function is:
3. the process of controlling the color register of the mechanical gravure press during the steady printing of the mechanical gravure press according to claim 1, wherein in the third step, the control calculation formula designed according to the model based on the lyapunov stability analysis method is:
4. the method for controlling the color register in the stable-speed printing process of the mechanical gravure press as claimed in claim 1, wherein in the third step, the mathematical model of the color register error and the change amount of the longitudinal linear velocity of the compensation roller between the color groups is as follows:
in the above model, ei(t) is the register error between the ith and first burst print cursors, Vi(T) is the control quantity, Δ T, of the longitudinal linear velocity of the compensating roll between color set i and color set (i +1)i(T) represents the length of material between color set i and color set (i +1), T*Tension between adjacent color groups under the condition that no color register error exists between the adjacent color groups; omega is the rotating angular speed of each printing plate roller 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;
the length of the material to be penetrated is the length of the material to be penetrated under the condition of no overprint error between the color group i and the color group (i + 1); r is the radius of each printing plate roller.
5. A color register control system in the speed-stabilized printing process of a mechanical axis gravure press, which applies the color register control method in the speed-stabilized printing process of the mechanical axis gravure press according to claim 1, wherein the color register control system in the speed-stabilized printing process of the mechanical axis gravure press specifically includes:
a tension control module: the tension sensor is arranged on the winding and unwinding part and used for detecting a tension value to feed back and adjust the speed of the winding and unwinding motor to maintain the tension balance of the winding and unwinding part of the printing equipment, so that the situations that a printing material is folded and is broken are avoided;
a color register control module: the color difference detection device is arranged between the printing color groups to detect color difference, and the longitudinal linear speed of the compensation roller is adjusted through color difference feedback, so that the tension between the color groups is adjusted, color register errors caused by various disturbance factors are eliminated, and the color register precision and the product quality are improved.
6. A mechanical axis gravure press for performing a process control method of the mechanical axis gravure press in a constant speed printing process according to claim 1, wherein the mechanical axis gravure press comprises:
the mechanical shaft gravure press comprises an unreeling feeding part, a printing unit and a discharging and reeling part;
unreeling and feeding part: the printing unit is used for feeding the printing material into the printing unit from the round roller for winding the material at a constant linear speed, and meanwhile, the tension control module is arranged to ensure the stability of printing tension;
a printing unit: used for printing the single-color pattern on the printing material in sequence;
a discharging and winding part: for continuous and smooth collection of printed material onto a take-up spool.
7. The mechanical axis gravure press of claim 6 wherein said printing unit specifically comprises:
the printing unit comprises a plurality of color sets; a dryer is arranged between each color group and is used for drying the materials before the materials are printed in the current color and then enter the next printing unit; the material penetrating lengths of the color groups can be the same or different;
a compensating roller is arranged between the two color groups, and the radius of the compensating roller is the same;
the printing unit also comprises a corresponding color register control device.
8. The mechanical rotogravure press of claim 7, wherein said color register control means specifically comprises:
the color register control device comprises a sensing device and a controller;
the sensing device comprises: is a photoelectric eye; the controller is used for detecting the color register error and sending the detected color register error to the controller;
a controller: and the servo motor is used for calculating a control quantity, namely the longitudinal linear velocity variation of the compensation rollers among the color groups according to a control calculation formula designed by the Lyapunov stability analysis method based on the model and the received color register error and the control quantity of the preorder color groups, and sending the control quantity to the mechanical axis gravure press in a control instruction mode.
9. An information data processing terminal for realizing the color register control method in the stable-speed printing process of the mechanical shaft gravure press according to any one of claims 1 to 4.
10. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method for controlling register in a constant speed printing process of a mechanical rotogravure press according to any one of claims 1 to 4.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296474A (en) * | 2021-05-06 | 2021-08-24 | 广州大学 | Chromatography control method, system and device for electronic shaft gravure press and storage medium |
| CN113311786A (en) * | 2021-05-06 | 2021-08-27 | 广州大学 | Electronic shaft gravure press chromatography control method, system and medium based on collective identification |
| CN116039264A (en) * | 2022-10-31 | 2023-05-02 | 季华实验室 | Control method and device for multi-axis motion platform, terminal equipment and storage medium |
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2019
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296474A (en) * | 2021-05-06 | 2021-08-24 | 广州大学 | Chromatography control method, system and device for electronic shaft gravure press and storage medium |
| CN113311786A (en) * | 2021-05-06 | 2021-08-27 | 广州大学 | Electronic shaft gravure press chromatography control method, system and medium based on collective identification |
| 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 |
| CN116039264A (en) * | 2022-10-31 | 2023-05-02 | 季华实验室 | Control method and device for multi-axis motion platform, terminal equipment and storage medium |
| CN116039264B (en) * | 2022-10-31 | 2023-09-22 | 季华实验室 | Control method and device for multi-axis motion platform, terminal equipment and storage medium |
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