CN113686243B - Method for measuring relative stretching amount of printing material - Google Patents
Method for measuring relative stretching amount of printing material Download PDFInfo
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- CN113686243B CN113686243B CN202110975946.XA CN202110975946A CN113686243B CN 113686243 B CN113686243 B CN 113686243B CN 202110975946 A CN202110975946 A CN 202110975946A CN 113686243 B CN113686243 B CN 113686243B
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- 239000000463 material Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 76
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 claims description 82
- 230000001960 triggered effect Effects 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 29
- 238000000691 measurement method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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- 238000013461 design Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The application discloses a method for measuring the relative stretching amount of a printing material, wherein the relative stretching amount refers to the deformation amount generated by tension fluctuation in the printing process relative to the printing material under the set tension in normal printing, the relative stretching amount can be positive or negative, the method determines the relative stretching amount of the printing material according to the image acquisition time interval of two color sets and the longitudinal position of a corresponding reference color set, and the color register parameter is corrected according to the relative stretching amount.
Description
Technical Field
The application belongs to the field of printing, and particularly relates to a method for measuring relative stretching amount of printing materials.
Background
The multi-color group printing device is used for printing products with complex color patterns, the complex color patterns are generally formed by nesting and printing different color groups, before formal printing, the multi-color group printing device is debugged to accurately align a plurality of color groups, so that printed matters meet the requirement of printing precision, and the process is called registration. High quality prints generally require higher registration accuracy, and in order to achieve high accuracy registration control, it is necessary to measure the registration offset value accurately in time, so as to correct the registration parameters in real time during the tone and printing process.
In the prior art, the method for detecting the offset value in real time comprises a registration scheme based on a visual method, and in general, the registration scheme based on the visual method firstly photographs a color code group, then identifies a color code image according to a photographed image, and then determines the offset value according to the color code image, however, a deformable printing substrate can be stretched in the printing process, particularly in the acceleration and deceleration process of a printing device, the tension of the printing device fluctuates, so that the printing substrate deforms, and the registration precision is reduced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a method for measuring the relative stretching amount of a printing material, wherein the relative stretching amount refers to the deformation amount generated by tension fluctuation in the printing process relative to a printing material under the set tension in normal printing, the relative stretching amount can be positive or negative, the method determines the relative stretching amount of the printing material according to the image acquisition time interval of two color sets and the longitudinal position of a corresponding reference color set, and the color register parameter is corrected according to the relative stretching amount.
The traditional method can not carry out quantitative printing material stretching amount measurement, and can only indirectly obtain or control qualitative stretching or shortening according to equipment tension. The application can be used for printing high-precision registration, rewinding, compounding and other equipment needing tension control.
The aim of the application is achieved by the following scheme:
a method of measuring the relative amount of stretch of a printing material, the method being for measuring the relative amount of stretch of a substrate having a relatively large stretch coefficient during printing, the method being adapted for use in an in-line multi-color-set printing apparatus comprising a plurality of mutually independent color sets, from the second color set in a sheet feed direction, downstream of each color set a measurement module, each measurement module comprising a delay trigger plate and a processor, each two measurement modules to be measured forming a stretch measuring set, the measurement module located upstream in each stretch measuring set being labeled as a first measurement module, the respective device in the measurement module being labeled as a first physical quantity, the respective device in the measurement module being labeled as a second measurement module, the respective device in the measurement module being labeled as a second physical quantity, the method comprising:
the first processor acquires a first time interval and sends the first time interval to the second processor, wherein the first time interval is a time interval in which the first delay trigger plate is triggered twice;
the second internal processor acquires a second time interval, wherein the second time interval is the time interval of the second time delay trigger plate being triggered twice, and the plate circumference of the second time delay trigger plate being triggered twice is the same as the plate circumference of the first time delay trigger plate being triggered twice correspondingly;
the first processor acquires a first longitudinal deviation, and sends the first longitudinal deviation to the second processor, wherein the first longitudinal deviation is the longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image which is printed by the first processor;
the second processor acquires a second longitudinal deviation, wherein the second longitudinal deviation is the longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image supported by the second processor;
the second processor acquires the paper feeding speed;
the second processor calculates the relative stretching amount of the printing material according to the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
In this implementation manner, the relative stretching amount of the printing material is calculated according to the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed, and specifically may be calculated according to the following formula (1):
Δl＝(Δt 2 -Δt 1 )×v+y 2 -y 1 (1)
Wherein Deltal represents the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 Representing a second time interval, v representing the speed of the paper feed, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation.
In this implementation manner, the method for acquiring the first longitudinal deviation includes:
acquiring geometric center coordinates of a first target image;
acquiring a geometric center coordinate of a first target image;
a first longitudinal offset is calculated, the first longitudinal offset being the difference between the geometric center ordinate of the first target image and the geometric center ordinate of the first target image.
Accordingly, the method for acquiring the second longitudinal deviation comprises the following steps:
acquiring geometric center coordinates of a second target image;
acquiring geometric center coordinates of a second target image;
and calculating a second longitudinal deviation, wherein the second longitudinal deviation is the difference between the geometric center ordinate of the second target image and the geometric center ordinate of the second target image.
In this implementation manner, the measurement method may further include:
acquiring a first correction trigger distance and a second correction trigger distance of the previous plate circumference;
acquiring a first actual trigger distance and a second actual trigger distance of the current plate periphery;
acquiring a first correction deviation and a second correction deviation;
and calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
Alternatively, the calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feeding speed may specifically be calculated according to the following formula (2):
Δl＝(Δt 2 -Δt 1 )×v+y 2 -y 1 +N 2 -M 2 +M 1 -N 1 (2)
Wherein Deltal represents the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 Representing a second time interval, v representing the speed of the paper feed, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation, N 1 Representing a first corrected trigger distance, M 1 Represents the first actual trigger distance, N 2 Represents the second correction trigger distance, M 2 Representing a second actual trigger distance.
In this implementation manner, the first correction trigger distance is a trigger distance after theoretical correction based on a first actual trigger distance of a previous plate week, where the first correction trigger distance is based on the plate week where the first correction trigger distance is acquired; correspondingly, the second correction trigger distance is a trigger distance after theoretical correction based on the second actual trigger distance of the previous plate circumference based on the plate circumference of which the second correction trigger distance is acquired.
In another implementation, the measuring method includes:
the first processor acquires a first distance interval and sends the first distance interval to the second processor, wherein the first distance interval is the paper feeding distance of the printing material during the period that the first delay trigger plate is triggered twice;
the second processor acquires a second distance interval, wherein the second distance interval is the paper feeding distance of the printing material during the period that the second delay trigger plate is triggered twice, and the plate circumference triggered twice by the second delay trigger plate is correspondingly the same as the plate circumference triggered twice by the first delay trigger plate;
the first processor acquires a first longitudinal deviation, and sends the first longitudinal deviation to the second processor, wherein the first longitudinal deviation is the longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image which is printed by the first processor;
the second processor acquires a second longitudinal deviation, wherein the second longitudinal deviation is the longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image supported by the second processor;
the second processor acquires the paper feeding speed;
the second processor calculates the relative stretching amount of the printing material according to the first distance interval, the second distance interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
In this implementation manner, the calculation of the relative stretching amount of the printing material according to the first distance interval, the second distance interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feeding speed may specifically be calculated according to the following formula (3):
Δl＝ΔL 2 -ΔL 1 +y 2 -y 1 (3)
Wherein Deltal represents the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 Representing a second distance interval, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation.
Further, the method for acquiring the first longitudinal deviation and the second longitudinal deviation is the same as the method for acquiring the corresponding longitudinal deviation in the previous implementation mode.
In this implementation manner, the measurement method may further include:
acquiring a first correction trigger distance and a second correction trigger distance of the previous plate circumference;
acquiring a first actual trigger distance and a second actual trigger distance of the current plate periphery;
acquiring a first correction deviation and a second correction deviation;
and calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
Alternatively, the calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feeding speed may specifically be calculated according to the following formula (4):
Δl＝ΔL 2 -ΔL 1 +y 2 -y 1 +N 2 -M 2 +M 1 -N 1 (4)
Wherein Deltal represents the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 Representing a second distance interval, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation, N 1 Representing a first corrected trigger distance, M 1 Represents the first actual trigger distance, N 2 Represents the second correction trigger distance, M 2 Representing a second actual trigger distance.
In this implementation manner, the first correction trigger distance is a trigger distance after theoretical correction based on a first actual trigger distance of a previous plate week, where the first correction trigger distance is based on the plate week where the first correction trigger distance is acquired; correspondingly, the second correction trigger distance is a trigger distance after theoretical correction based on the second actual trigger distance of the previous plate circumference based on the plate circumference of which the second correction trigger distance is acquired.
In a second aspect, the present application also provides a program for measuring the relative stretching amount of a printing material, the program being used for implementing the steps of the method for measuring the relative stretching amount of a printing material according to the first aspect.
In a third aspect, a computer readable storage medium has stored thereon computer instructions which, when executed by a processor, implement the steps of the method for measuring a relative amount of stretching of a printing material according to the first aspect described above.
In a fourth aspect, a detection apparatus includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the method of measuring the relative amount of stretching of a printing material of the first aspect described above.
Compared with the prior art, the method provided by the application is based on a visual scheme, the relative stretching amount of the printing material between any two color groups can be measured by utilizing the target form of a unique design and the relative stretching amount measurement of the printing material between any two color groups of a specific measurement module, the relative stretching amount obtained by the method is closer to a true value, and the measurement error reaches the pixel level.
Drawings
FIG. 1 is a schematic diagram of a printing apparatus including a measurement method according to the present application;
FIG. 2 shows a schematic representation of the present application providing a peri-plate target;
FIG. 3 is a flow chart showing a method for measuring the relative stretching amount of printing material according to the present application;
FIG. 4 is a flow chart showing another method for measuring the relative stretching amount of printing material according to the present application.
Description of the reference numerals
1-color group, 11-plate cylinder, 12-impression cylinder, 13-guide cylinder, 2-measurement module, 21-image collector, 22-light source, 23-delay trigger plate, 24-sensor, 25-processor, 3-color subsystem, 4-printer communication bus.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of methods consistent with aspects of the application as detailed in the accompanying claims.
The method for measuring the relative stretching amount of the printing material provided by the application is described in detail below by means of specific examples.
First, a brief description will be given of a usage scenario of the present solution.
Fig. 1 shows a schematic diagram of a printing apparatus to which the measurement method provided by the present application is applied, and as shown in fig. 1, the multi-color-set printing machine includes a plurality of color sets 1 and a plurality of measurement modules 2, and one measurement module 2 is disposed downstream of each color set 1 from the second color set 1 in the paper feeding direction.
In this example, each color matching subsystem 3 includes only one color set and a measurement module uniquely matched with the color set, that is, the measurement module performs registration detection for only the designated unique color set, the detection of the offset values of the color sets is independent, and each measurement module is closely adjacent to the corresponding color set, so that the offset value of the color set can be detected immediately after the printing of the color set is completed, the detection efficiency is higher, and the accuracy of the detected offset value is higher.
As shown in fig. 1, each color set 1 includes a plate cylinder 11, an impression cylinder 12, and at least two guide cylinders 13, wherein the plate cylinder 11 is disposed opposite to the impression cylinder 12, a substrate to be printed is passed through and pressed by a slit between the plate cylinder 11 and the impression cylinder 12, the two guide cylinders 13 are disposed on both sides of a pressing position of the plate cylinder 11 and the impression cylinder 12, respectively, and the measuring module 2 is disposed downstream of the guide cylinder 13 located downstream.
Taking the printing apparatus shown in fig. 1 as an example, assuming that the printing includes N color sets in total, where a first color set located upstream of the production line is a reference color set, and no measurement module is provided, then, starting from a second color set, one measurement module is provided downstream of each color set, and then, the entire registration system includes N-1 measurement modules in total.
As shown in fig. 1, each of the measurement modules 2 includes an image collector 21 for collecting an image of a target, a light source 22 for supplementing light for image collection, a delay trigger plate 23 for triggering the image collector 21 and the light source 22, a sensor 24 for triggering the delay trigger plate, and a processor 25 for calculating a slip value, and the processor 25 in each measurement module 2 is electrically connected to a printer controller through a printer communication bus 4.
In this example, the printer controller is a controller that performs adjustment of the printing positions of each color set according to the correction parameters, and the controller may control adjustment of the printing positions of all color sets, where any adjustment manner in the prior art may be used, and the present application is not discussed in detail in the scheme of the present application.
Alternatively, the printer controller may be in communication with each processor via a cable, or may be in communication via a wireless means, such as a wireless lan.
In this example, the delay trigger plate 23 is electrically connected to the sensor 24, the processor 25, the image collector 21 and the light source 22, and the processor 25 is further electrically connected to the image collector 21, so that the delay trigger plate 23 can generate a delay trigger signal for each device in the measurement module according to a trigger signal generated by the photoelectric target, that is, generate an image acquisition delay signal for the image collector, generate a light source delay signal for the light source, and send the light source delay signal to the corresponding device respectively, and each device in the measurement module is triggered and started according to the corresponding trigger signal.
It should be further noted that, during the printing process, since the speed of the regulator is generally smaller and the production speed is generally larger, the speed from the speed of the regulator to the production speed needs to be accelerated, and the speed of the printing material needs to be reduced after the printing material runs out or reaches the printing length requirement, so that the printing tension changes, and further the printing material is deformed. It will be appreciated that this amount may be positive or negative, i.e., the relative amount of stretch described herein may be either positive or negative; in general, the relative stretching amount is positive if the printing material is stretched, and negative if the printing material is shortened.
It will be appreciated that even if the printing press is operated at production speeds, its actual feed speed is within a small fluctuation range, and controlling the feed speed results in a weak acceleration or deceleration of the press, which also results in fluctuations in the tensile deformation of the printing material, and therefore, it is necessary to measure the relative amount of stretch of the printing material in real time.
The method for measuring the relative tension of a printing material according to the present application will be described below by taking the apparatus shown in fig. 1 as an example.
The scheme provided by the application is used for measuring the relative stretching amount of the printing material after paper is fed between any two color groups, so that two measuring modules to be measured are regarded as one stretching amount measuring group, the measuring module positioned at the upstream in each stretching amount measuring group is marked as a first measuring module, each device in the measuring module is correspondingly marked as a first device, the physical quantity processed by the measuring module is marked as a first physical quantity, the measuring module positioned at the downstream is marked as a second measuring module, each device in the measuring module is correspondingly marked as a second device, and the physical quantity processed by the measuring module is marked as a second physical quantity. It is understood that the two color sets to be measured may or may not be adjacent, and the following examples will be described by taking the adjacent two color sets as examples unless otherwise specified.
Fig. 2 shows that the present application provides a schematic representation of a pericycle target, as shown in fig. 2, each pericycle target comprising a photoelectric target, a calibration target, and a plurality of reference targets.
Fig. 3 shows a flowchart of a method for measuring a relative stretching amount of a printing material according to the present application, and as shown in fig. 3, the method measures based on time intervals and a feeding speed, specifically includes the following steps S101 to S106:
in step S101, the first processor acquires a first time interval and sends the first time interval to the second processor, where the first time interval is a time interval in which the first delay trigger plate is triggered twice.
In this example, the time interval refers to a time interval in which the same color set is triggered at two plate weeks, where the two plate weeks may be two adjacent plate weeks or two plate weeks not adjacent to each other, and how to select the time interval is specifically selected according to the measurement object, for example, if the relative stretching amounts of the printing material during the two adjacent plate weeks are calculated, the starting and ending moments of the time interval are respectively the moments when the color sets are respectively triggered at the two adjacent plate weeks, and if the relative stretching amounts of the printing material during the first and third plate weeks are calculated, the starting and ending moments of the time interval are respectively the moments when the color sets are respectively triggered at the first plate week and the third plate week.
It will be appreciated that the range of relative stretching is dependent upon the particular application, for example, in which the stretching is used for registration value correction, and that the relative stretching of the substrate between adjacent colour sets is typically measured in order to be able to more timely and accurately adjust the registration parameters. For another example, in winding applications to maintain a fixed stretch ratio, to accurately measure the change in stretch ratio, the relative amount of stretch from the unwind end to the wind-up end is typically measured.
In this example, the first time interval is a difference between the trigger times of the first color set at two to-be-measured periods, and the difference may be acquired by the first processor and sent to the second processor.
Step S102, the second processor acquires a second time interval, wherein the second time interval is the time interval of the second time delay trigger plate being triggered twice, and the plate circumference of the second time delay trigger plate being triggered twice is the same as the plate circumference of the first time delay trigger plate being triggered twice.
In this example, the manner of acquiring the second time interval is the same as the manner of acquiring the first time interval, and will not be described herein.
In particular, the start-stop time of the second time interval is the same as the plate circumference of the first time interval. For example, if the first time interval is the time interval between the first color set first and second plate weeks, the second time interval is the time interval between the second color set first and second plate weeks; if the first time interval is the time interval between the first and third plate weeks of the first color set, the second time interval is the time interval between the first and third plate weeks of the second color set.
In step S103, the first processor acquires a first longitudinal deviation, and sends the first longitudinal deviation to the second processor, where the first longitudinal deviation is a longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image printed by the first processor.
In this example, the longitudinal direction refers to a direction along the paper feed. Based on this, it is understood that the longitudinal deviation refers to a deviation in the paper feeding direction.
In this implementation manner, the method for acquiring the first longitudinal deviation includes step S131 to step S133:
step S131, acquiring geometric center coordinates of the first target image.
In this example, the step may specifically include:
acquiring a first target image;
a first target image geometric center coordinate is determined.
The first target image is an image acquired by an image acquirer, the image carries a first target image, the first target image may be complete or incomplete, but as the printing period increases, the color register parameter is continuously corrected, and the first target image is more and more approaching to the center of the first target image.
Further, the geometric center coordinates of the first target image may be determined according to any method in the prior art, which is not particularly limited in the present application.
Step S132, obtaining the geometric center coordinates of the first target image.
In this example, the step may specifically include:
determining a first target image of the target;
a first target image geometric center coordinate is determined.
In this example, the method of determining the first target image in the first target image is not particularly limited, and any method of determining the specific target image in the related art may be used.
Further, the present example is illustratively described using a ring-shaped or circular target, and any method of determining the geometric center of a geometric image in the prior art may be used to determine the geometric center of the first target image and to determine the coordinates of the geometric center of the first target image in the same coordinate system as the first target image.
It will be appreciated that even if the first target image is incomplete, the geometric means may be used to determine its geometric center, which may be outside the first target image, but its coordinates are still determined in the aforementioned coordinate system.
Further, for other shapes of target that are available, the geometric center coordinates thereof may also be determined in the same manner as the examples or in an equivalent transformation.
Step S133, calculating a first longitudinal deviation, wherein the first longitudinal deviation is the difference between the geometric center ordinate of the first target image and the geometric center ordinate of the first target image.
In this example, the first longitudinal deviation only takes into account the difference between the ordinate of the two geometric centers, and even if there is a difference in the transverse direction, it is temporarily not taken into account in this example.
In step S104, the second processor acquires a second longitudinal deviation, where the second longitudinal deviation is a longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image printed by the second processor.
Similar to the acquisition of the first longitudinal deviation, the method of acquiring the second longitudinal deviation may comprise the steps of:
acquiring geometric center coordinates of a second target image;
acquiring geometric center coordinates of a second target image;
and calculating a second longitudinal deviation, wherein the second longitudinal deviation is the difference between the geometric center ordinate of the second target image and the geometric center ordinate of the second target image.
The implementation manner of each step is the same as that of each step corresponding to the calculation of the first longitudinal deviation, and will not be described herein.
In step S105, the second processor acquires the paper feed speed.
In this example, the paper feeding speed may be a preset value, or may be an actual measurement value, and the method for measuring the paper feeding speed may be any method for measuring the paper feeding speed of a printing press in the prior art, which is not particularly limited in the present application.
In step S106, the second processor calculates the relative stretching amount of the printing material according to the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
In this example, this step can be specifically calculated according to the following formula (1):
Δl＝(Δt 2 -Δt 1 )×v+y 2 -y 1 (1)
Wherein Deltal represents the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 Representing a second time interval, v representing the speed of the paper feed, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation.
In this implementation manner, the measurement method may further include the following steps S107 to S110:
step S107, obtaining the first corrected trigger distance N of the previous plate week 1 And a second correction trigger distance N 2 。
In this implementation manner, the first corrected trigger distance is a trigger distance after theoretical correction based on the first actual trigger distance of the previous plate week, for example, this calculation is a relative stretching amount of the printing material between the fourth plate week and the fifth plate week, and then the first corrected trigger distance is a theoretical correction amount of the actual trigger distance between the third plate week and the fourth plate week, which is determined by a parameter according to a deviation value or the like, so that the first corrected trigger distance is a theoretical value, which is taken as an ideal value of the trigger distance between the fourth plate week and the fifth plate week in this example.
Correspondingly, the second correction trigger distance is a trigger distance after theoretical correction based on the second actual trigger distance of the previous plate circumference based on the plate circumference of which the second correction trigger distance is acquired.
Step S108, obtaining a first actual trigger distance M of the current plate circumference 1 And a second actual trigger distance M 2 。
The first actual trigger distance of the current plate week is an actual measurement value. Ideally, the first actual trigger distance is equal to the first corrected trigger distance.
It will be appreciated that the second actual trigger distance is similar to the first actual trigger distance.
Step S109, acquiring a first correction deviation and a second correction deviation.
In this example, the first correction deviation is a first correction trigger distance N 1 Distance from the first actual trigger M 1 And (3) a difference.
Similarly, the second correction deviation is a second correction trigger distance N 2 Distance from the second actual trigger M 2 And (3) a difference.
Step S110, calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
The step can be specifically calculated according to the following formula (2):
Δl＝(Δt 2 -Δt 1 )×v+y 2 -y 1 +N 2 -M 2 +M 1 -N 1 (2)
Wherein Deltal represents the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 Representing a second time interval, v representing the speed of the paper feed, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation, N 1 Representing a first corrected trigger distance, M 1 Represents the first actual trigger distance, N 2 Represents the second correction trigger distance, M 2 Representing a second actual trigger distance.
Fig. 4 shows a flowchart of another method for measuring the relative stretching amount of printing material according to the present application, as shown in fig. 4, the method specifically includes the following steps S201 to S206:
in step S201, the first processor acquires a first distance interval and sends the first distance interval to the second processor, where the first distance interval is a paper feeding distance of the printing material during the period that the first delay trigger plate is triggered twice.
In this example, the acquisition opportunity is as described in step S101, and will not be described in detail here.
Further, the paper feeding distance may be any method of measuring the paper feeding distance of the printing material in a specific time period in the prior art, and the present application is not particularly limited.
Step S202, a second processor acquires a second distance interval, wherein the second distance interval is the paper feeding distance of the printing material during the period that the second delay trigger plate is triggered twice, and the plate circumference triggered twice by the second delay trigger plate is the same as the plate circumference triggered twice by the first delay trigger plate correspondingly.
The acquisition timing of this step is as described in step S102, and will not be described in detail here.
Further, the collection manner of the paper feeding distance is the same as that of step S201, so as to reduce the systematic error.
In step S203, the first processor acquires a first longitudinal deviation, and sends the first longitudinal deviation to the second processor, where the first longitudinal deviation is a longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image that the first processor supports.
The implementation manner of this step is the same as that of step S103, and will not be described here again.
In step S204, the second processor acquires a second longitudinal deviation, where the second longitudinal deviation is a longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image that the second processor prints.
The implementation manner of this step is the same as that of step S104, and will not be described here again.
In step S205, the second processor acquires the paper feed speed.
The implementation manner of this step is the same as that of step S105, and will not be described here again.
In step S206, the second processor calculates the relative stretching amount of the printing material according to the first distance interval, the second distance interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
In this implementation manner, the calculation of the relative stretching amount of the printing material according to the first distance interval, the second distance interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feeding speed may specifically be calculated according to the following formula (3):
Δl＝ΔL 2 -ΔL 1 +y 2 -y 1 (3)
Wherein Deltal represents the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 Representing a second distance interval, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation.
Further, the method for acquiring the first longitudinal deviation and the second longitudinal deviation is the same as the method for acquiring the corresponding longitudinal deviation in the previous implementation mode.
In this implementation manner, the measurement method may further include steps S207 to S210:
step S207, a first correction trigger distance and a second correction trigger distance of the previous plate circumference are obtained;
step S208, a first actual trigger distance and a second actual trigger distance of the current plate cycle are obtained;
step S209, acquiring a first correction deviation and a second correction deviation;
step S210, calculating a relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feeding speed, specifically according to the following formula (4):
Δl＝ΔL 2 -ΔL 1 +y 2 -y 1 +N 2 -M 2 +M 1 -N 1 (4)
Wherein Deltal represents the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 Representing a second distance interval, y 1 Representing a first longitudinal deviation, y 2 Representing a second longitudinal deviation, N 1 Representing a first corrected trigger distance, M 1 Represents the first actual trigger distance, N 2 Represents the second correction trigger distance, M 2 Representing the second actual trigger distanceAnd (5) separating.
In this example, the steps S207 to S209 correspond to the steps S107 to S109, respectively, and are not described herein.
The application also provides a program for measuring the relative stretching amount of the printing material, which is used for realizing the steps of the method for measuring the relative stretching amount of the printing material in the first aspect when being executed.
The present application also provides a computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, perform the steps of the method of measuring the relative amount of stretching of a printing material of the first aspect described above.
The present application also provides a detection apparatus comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the method of measuring the relative amount of stretching of a printing material of the first aspect described above.
The application has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the application. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (10)
1. A method for measuring the relative stretching amount of a printing material, wherein the measuring method is used for measuring the relative stretching amount of a printing substrate with a larger stretching coefficient in a printing process, a printing device to which the measuring method is applied comprises a plurality of color groups, one measuring module is arranged at the downstream of each color group from the second color group along the paper feeding direction, each measuring module comprises a delay trigger plate and a processor, each measuring module forms a stretching amount measuring group, the measuring module at the upstream in each stretching amount measuring group is marked as a first measuring module, each device in the first measuring module is correspondingly marked as a first physical amount, each device in the second measuring module is correspondingly marked as a second physical amount, and the physical amount processed in the second measuring module is correspondingly marked as a second physical amount, and the measuring method comprises:
the first processor acquires a first time interval and sends the first time interval to the second processor, wherein the first time interval is a time interval in which the first delay trigger plate is triggered twice;
the second processor acquires a second time interval, wherein the second time interval is the time interval of the second time delay trigger plate being triggered twice, and the plate circumference of the second time delay trigger plate being triggered twice is the same as the plate circumference of the first time delay trigger plate being triggered twice correspondingly;
the second processor acquires a first longitudinal deviation, wherein the first longitudinal deviation is the longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image supported by the second processor;
the second processor acquires a second longitudinal deviation, wherein the second longitudinal deviation is the longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image supported by the second processor;
the second processor acquires the paper feeding speed;
the second processor calculates the relative stretching amount of the printing material according to the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
2. The method according to claim 1, wherein the relative stretching amount of the printing material is calculated according to the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed, specifically according to the following formula (1):
formula (1);
wherein delta islIndicating the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 A second time interval is indicated and a second time interval is indicated,vthe paper feeding speed is indicated by the speed of the paper,y 1 a first longitudinal deviation is indicated and is indicated,y 2 representing a second longitudinal deviation.
3. The method according to claim 1 or 2, wherein the method of obtaining the first longitudinal deviation comprises:
acquiring geometric center coordinates of a first target image;
acquiring a geometric center coordinate of a first target image;
a first longitudinal offset is calculated, the first longitudinal offset being the difference between the geometric center ordinate of the first target image and the geometric center ordinate of the first target image.
4. The method according to claim 1 or 2, wherein the measuring method further comprises:
acquiring a first correction trigger distance and a second correction trigger distance of the previous plate circumference;
acquiring a first actual trigger distance and a second actual trigger distance of the current plate periphery;
acquiring a first correction deviation and a second correction deviation;
and calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation and the paper feeding speed.
5. The method according to claim 4, wherein the calculation of the printing material relative stretching amount based on the first correction deviation, the second correction deviation, the first time interval, the second time interval, the first longitudinal deviation, the second longitudinal deviation, and the paper feed speed is specifically calculated according to the following formula (2):
formula (2);
wherein delta islIndicating the relative stretching amount of the printing material, deltat 1 Representing a first time interval, deltat 2 A second time interval is indicated and a second time interval is indicated,vthe paper feeding speed is indicated by the speed of the paper,y 1 a first longitudinal deviation is indicated and is indicated,y 2 a second longitudinal deviation is indicated and is indicated,N 1 indicating a first corrected trigger distance that is to be used,M 1 indicating a first actual trigger distance from which the trigger is to be triggered,N 2 representing a second correction trigger distance from which the correction is to be made,M 2 representing a second actual trigger distance.
6. The method of claim 4, wherein the first corrected trigger distance is a trigger distance based on a plate circumference from which the first corrected trigger distance was obtained, the theoretical correction being performed based on a first actual trigger distance from a previous plate circumference; the second correction trigger distance is a trigger distance after theoretical correction based on a second actual trigger distance of the previous plate circumference based on the plate circumference of which the second correction trigger distance is acquired.
7. A method for measuring the relative stretching amount of a printing material, wherein the measuring method is used for measuring the relative stretching amount of a printing substrate with a larger stretching coefficient in a printing process, a printing device to which the measuring method is applied comprises a plurality of color groups, one measuring module is arranged at the downstream of each color group from the second color group along the paper feeding direction, each measuring module comprises a delay trigger plate and a processor, each measuring module forms a stretching amount measuring group, the measuring module at the upstream in each stretching amount measuring group is marked as a first measuring module, each device in the first measuring module is correspondingly marked as a first physical amount, each device in the second measuring module is correspondingly marked as a second physical amount, and the physical amount processed in the second measuring module is correspondingly marked as a second physical amount, and the measuring method comprises:
the first processor acquires a first distance interval and sends the first distance interval to the second processor, wherein the first distance interval is the paper feeding distance of the printing material during the period that the first delay trigger plate is triggered twice;
the second processor acquires a second distance interval, wherein the second distance interval is the paper feeding distance of the printing material during the period that the second delay trigger plate is triggered twice, and the plate circumference triggered twice by the second delay trigger plate is correspondingly the same as the plate circumference triggered twice by the first delay trigger plate;
the first processor acquires a first longitudinal deviation, and sends the first longitudinal deviation to the second processor, wherein the first longitudinal deviation is the longitudinal deviation between the geometric center of the first target image and the geometric center of the first target image which is printed by the first processor;
the second processor acquires a second longitudinal deviation, wherein the second longitudinal deviation is the longitudinal deviation between the geometric center of the second target image and the geometric center of the second target image supported by the second processor;
the second processor calculates the relative stretching amount of the printing material according to the first distance interval, the second distance interval, the first longitudinal deviation and the second longitudinal deviation.
8. The method according to claim 7, wherein calculating the relative stretching amount of the printing material based on the first distance interval, the second distance interval, the first longitudinal deviation, and the second longitudinal deviation is specifically calculated according to the following formula (3):
Δl=ΔL 2 -ΔL 1 +y 2 -y 1 formula (3);
wherein delta islIndicating the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 A second distance interval is indicated and is indicated,y 1 a first longitudinal deviation is indicated and is indicated,y 2 representing a second longitudinal deviation.
9. The method of claim 7, wherein the measuring method further comprises:
acquiring a first correction trigger distance and a second correction trigger distance of the previous plate circumference;
acquiring a first actual trigger distance and a second actual trigger distance of the current plate periphery;
acquiring a first correction deviation and a second correction deviation;
and calculating the relative stretching amount of the printing material according to the first correction deviation, the second correction deviation, the first correction trigger distance and the second correction trigger distance of the previous printing plate circumference, and the first actual trigger distance and the second actual trigger distance of the current printing plate circumference.
10. The method according to claim 9, wherein the calculating the printing material relative stretching amount according to the first distance interval, the second distance interval, the first longitudinal deviation, the second longitudinal deviation, the first correction trigger distance, the first actual trigger distance, the second correction trigger distance, and the second actual trigger distance is specifically calculated according to the following formula (4):
formula (4);
wherein delta islIndicating the relative stretching amount of the printing material, deltaL 1 Represents a first distance interval, deltaL 2 A second distance interval is indicated and is indicated,y 1 a first longitudinal deviation is indicated and is indicated,y 2 a second longitudinal deviation is indicated and is indicated,N 1 indicating a first corrected trigger distance that is to be used,M 1 indicating a first actual trigger distance from which the trigger is to be triggered,N 2 representing a second correction trigger distance from which the correction is to be made,M 2 representing a second actual trigger distance.
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