Closed-loop control method of printing equipment

Abstract

The invention discloses a closed-loop control method for printing equipment. The closed-loop control method comprises the specific steps that S1, the initial ink amount of a movable part is preset for an ink fountain of a printing machine; s2, a sensor detection module reads the colored tape through a scanner, displays color density data corresponding to each ink area, and identifies whether the ink key density data exceeds a tolerance range; s3, the controller processing module obtains scanning color data, and the adjustment amount corresponding to each ink key of each color group is calculated; s4, the actuator adjusting module generates ink control information according to a calculation result and transmits the ink control information to a printing machine system; s5, after the actuator adjusting module completes the automatic adjustment of the ink key, the feedback correction module sends the change value of the output parameter back to the controller processing module, the scanner reads the color tape and displays the color density data corresponding to each ink area, the result shows that the data of each color of ink area returns to the tolerance range, the color returns to be stable, and the operation is finished. According to the invention, the stability and consistency of printing quality can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment, and in particular relates to a closed-loop control method for printing equipment. Background Art

[0002] Traditional printing equipment uses open-loop control during operation. Open-loop control is a control method that continuously adjusts printing parameters based on prior information during the printing process. It does not provide feedback on the actual printing results, but only follows the preset printing parameters for production. Therefore, the accuracy and stability of open-loop control are low. The application scenarios of open-loop control are mainly in some simple printing processes, such as monochrome printing, label printing, etc. Since the printing parameters of these processes change relatively little, open-loop control can meet the requirements. For complex processes such as multi-color printing and high-definition printing, open-loop control cannot provide sufficient accuracy and stability, so the application scenarios are limited.

[0003] The offset color adjustment process of printing equipment relies on manual measurement of color ribbons and adjustment of ink keys. This method is time-consuming and prone to errors, and also leads to waste of printed sheets and ink. Due to its accuracy and stability issues, it also requires more debugging and maintenance work, which increases the overall cost. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and to provide a closed-loop control method for a printing device.

[0005] A closed-loop control method for printing equipment includes a sensor detection module, a controller processing module, an actuator adjustment module, and a feedback correction module. The sensor detection module continuously detects printing process parameters, and the printing process parameters include the thickness, color, and position of the printed sheet; the controller processing module sends the collected data to the controller for processing, and the controller compares and calculates according to preset parameters to generate a control signal; the actuator adjustment module transmits the control signal to the actuator, and the actuator adjusts the output parameters according to the signal, and the output parameters include printing pressure and ink flow; the feedback correction module enables the change of the output parameter to be detected by the sensor, and then sends it back to the controller for comparison and calculation again, so as to realize closed-loop control. The specific steps are as follows: S1. Before printing begins, the sensor detection module presets the initial ink volume of the printing machine ink fountain based on the pre-inking data, that is, by extracting the digital information of the layout image area coverage distribution and the quantitative requirements of the ink layer thickness, converting them into the ink key value that the printing machine can accept, and then setting the output ink volume accordingly; S2. Start running the printing press after everything is ready. When the ink is in place, extract the printed sheet. The sensor detection module reads the ribbon through the scanner and displays the color density data corresponding to each ink zone to identify whether the ink key density data exceeds the tolerance range. S3. The controller processing module obtains the scanned color data and calculates the adjustment amount corresponding to each ink key of each color group according to the difference between the current density and the set target; S4. The actuator adjustment module generates ink control information based on the calculation results and transmits it to the printing press system, automatically and accurately adjusting the opening and closing degree of the ink keys of each color group, and then adjusting the ink amount to control the density of each color ink; S5. After the actuator adjustment module completes the automatic adjustment of the ink key, the feedback correction module sends the change value of the output parameter back to the controller processing module, and runs the printing equipment again. After the ink is in place, the printed sheet is extracted, and the scanner reads the ribbon and displays the color density data corresponding to each ink area. The results show that the data of each color ink area returns to the tolerance range and the color returns to stability.

[0006] A further improvement of the present invention is that in step S1, the sensor detection module is provided with a machine vision mechanism, which performs high-precision detection on the printed sheet. The machine vision mechanism captures the image on the printed sheet through a camera and compares it with a standard image.

[0007] A further improvement of the present invention is that in step S2, the color ribbon is a long strip of alternating colors.

[0008] A further improvement of the present invention is that the color ribbon is provided with spot color blocks, and the spot color blocks are placed in the ink key area corresponding to the spot color part of the printed sheet.

[0009] A further improvement of the present invention is that in step S2, the scanning time of the scanner is 6 to 10 seconds.

[0010] A further improvement of the present invention is that in step S3, the controller processing module includes a printing signal processing module, a printing signal transmission module and a printing signal communication module.

[0011] A further improvement of the present invention is that the printing signal processing module includes a power module, a radio frequency amplification module, a filtering module, a radio frequency detection module and a display control module, and the display control module is equipped with a touch screen interface.

[0012] A further improvement of the present invention is that, in step S5, the feedback correction module includes a plurality of feedback units, and the control end of each feedback unit is respectively connected to a different printing control point.

[0013] Compared with the prior art, the closed-loop control method of a printing device provided by the present invention achieves at least the following beneficial effects: The closed-loop control system formed by the present invention can realize precise control of various parameters in the printing process, avoid manual measurement of color ribbons and adjustment of ink keys, reduce human factors in the production process, and thus ensure the stability and consistency of printing quality; it can quickly respond to changes in the printing process and automatically adjust output parameters, while achieving color stability control of printed products, shortening printing preparation time, improving production efficiency, and achieving uniformity of color communication in the entire printing workflow; it can avoid waste of printed sheets and ink in the printing process, thereby reducing production costs. DETAILED DESCRIPTION

[0014] Various exemplary embodiments of the present invention are now described in detail. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. The following description of at least one exemplary embodiment is actually only illustrative and is not intended to be any limitation on the present invention and its application or use.

[0015] The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0016] A closed-loop control method for printing equipment includes a sensor detection module, a controller processing module, an actuator adjustment module, and a feedback correction module. The sensor detection module continuously detects printing process parameters, and the printing process parameters include the thickness, color, and position of the printed sheet; the controller processing module sends the collected data to the controller for processing, and the controller compares and calculates according to preset parameters to generate a control signal; the actuator adjustment module transmits the control signal to the actuator, and the actuator adjusts the output parameters according to the signal, and the output parameters include printing pressure and ink flow; the feedback correction module enables the change of the output parameter to be detected by the sensor, and then sends it back to the controller for comparison and calculation again, so as to realize closed-loop control. The specific steps are as follows: S1. Before printing begins, the sensor detection module presets the initial ink volume of the printing machine ink fountain based on the pre-inking data, that is, by extracting the digital information of the layout image area coverage distribution and the quantitative requirements of the ink layer thickness, converting them into the ink key value that the printing machine can accept, and then setting the output ink volume accordingly; S2. Start running the printing press after everything is ready. When the ink is in place, extract the printed sheet. The sensor detection module reads the ribbon through the scanner and displays the color density data corresponding to each ink zone to identify whether the ink key density data exceeds the tolerance range. S3. The controller processing module obtains the scanned color data and calculates the adjustment amount corresponding to each ink key of each color group according to the difference between the current density and the set target; S4. The actuator adjustment module generates ink control information based on the calculation results and transmits it to the printing press system, automatically and accurately adjusting the opening and closing degree of the ink keys of each color group, and then adjusting the ink amount to control the density of each color ink; S5. After the actuator adjustment module completes the automatic adjustment of the ink key, the feedback correction module sends the change value of the output parameter back to the controller processing module, and runs the printing equipment again. After the ink is in place, the printed sheet is extracted, and the scanner reads the ribbon and displays the color density data corresponding to each ink area. The results show that the data of each color ink area returns to the tolerance range and the color returns to stability.

[0017] A further improvement of the present invention is that in step S1, the sensor detection module is provided with a machine vision mechanism, which performs high-precision detection on the printed sheet. The machine vision mechanism captures the image on the printed sheet through a camera and compares it with the standard image. It can detect slight differences and determine unqualified products, thereby ensuring the accuracy and quality of the printed product.

[0018] A further improvement of the present invention is that in step S2, the color ribbon is a long strip of alternating colors.

[0019] A further improvement of the present invention is that the color ribbon is provided with spot color blocks, which are placed in the ink key area corresponding to the spot color part of the printed sheet. The spot color blocks can ensure the accuracy and consistency of color during the printing process. For printed products that need to accurately present specific colors or large areas of uniform color blocks, the spot color blocks can provide better visual effects and color accuracy.

[0020] A further improvement of the present invention is that in step S2, the scanning time of the scanner is 6 to 10 seconds, and the image can be scanned and processed at a high resolution, so that an accurate image can be obtained quickly.

[0021] A further improvement of the present invention is that in step S3, the controller processing module includes a printing signal processing module, a printing signal transmission module and a printing signal communication module, which is not only highly expandable but also more convenient to maintain.

[0022] A further improvement of the present invention is that the printing signal processing module includes a power module, a radio frequency amplification module, a filtering module, a radio frequency detection module and a display control module. The display control module is equipped with a touch screen interface. The touch screen interface can provide a faster response speed. The user can quickly perform operations such as scrolling, clicking, and dragging, thereby saving time and energy and improving work efficiency.

[0023] A further improvement of the present invention is that in step S5, the feedback correction module includes multiple feedback units, and the control end of each feedback unit is respectively connected to a different printing control point. Multiple feedback units can enhance the overall performance of the system. By introducing multiple feedback loops, the system can better adjust and optimize its output, thereby improving the stability and response speed of the system.

[0024] In summary, the closed-loop control method of a printing device provided by the present invention can form a closed-loop control system that can achieve precise control of various parameters in the printing process, avoid manual measurement of color ribbons and adjustment of ink keys, reduce human influence factors in the production process, and thus ensure the stability and consistency of printing quality; it can quickly respond to changes in the printing process and automatically adjust output parameters, while achieving color stability control of printed products, shortening printing preparation time, improving production efficiency, and achieving uniformity of color communication in the entire printing workflow; it can avoid waste of printed sheets and ink during the printing process and reduce production costs.

[0025] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A closed-loop control method for a printing device, characterized in that: It includes a sensor detection module, a controller processing module, an actuator adjustment module, and a feedback correction module. The sensor detection module continuously detects printing process parameters, which include the thickness, color, and position of the printed sheet. The controller processing module sends the collected data to the controller for processing. The controller compares and calculates according to the preset parameters to generate a control signal. The actuator adjustment module transmits the control signal to the actuator, and the actuator adjusts the output parameters according to the signal, and the output parameters include printing pressure and ink flow rate; the feedback correction module enables the change of the output parameter to be detected by the sensor, and then sent back to the controller for comparison and calculation to achieve closed-loop control. The specific steps are as follows: S1. Before printing begins, the sensor detection module presets the initial ink volume of the printing machine ink fountain based on the pre-inking data, that is, by extracting the digital information of the layout image area coverage distribution and the quantitative requirements of the ink layer thickness, converting them into the ink key value that the printing machine can accept, and then setting the output ink volume accordingly; S2. Start running the printing press after everything is ready. When the ink is in place, extract the printed sheet. The sensor detection module reads the ribbon through the scanner and displays the color density data corresponding to each ink zone to identify whether the ink key density data exceeds the tolerance range. S3. The controller processing module obtains the scanned color data and calculates the adjustment amount corresponding to each ink key of each color group according to the difference between the current density and the set target; S4. The actuator adjustment module generates ink control information based on the calculation results and transmits it to the printing press system, automatically and accurately adjusting the opening and closing degree of the ink keys of each color group, and then adjusting the ink amount to control the density of each color ink; S5. After the actuator adjustment module completes the automatic adjustment of the ink key, the feedback correction module sends the change value of the output parameter back to the controller processing module, and runs the printing equipment again. After the ink is in place, the printed sheet is extracted, and the scanner reads the ribbon and displays the color density data corresponding to each ink area. The results show that the data of each color ink area returns to the tolerance range and the color returns to stability.

2. A closed-loop control method for a printing device according to claim 1, characterized in that: In the step S1, the sensor detection module is provided with a machine vision mechanism, and the machine vision mechanism performs high-precision detection on the printed sheet. The machine vision mechanism captures the image on the printed sheet through a camera and compares it with a standard image.

3. A closed-loop control method for a printing device according to claim 1, characterized in that: In step S2, the color ribbon is a long strip of alternating colors.

4. A closed-loop control method for a printing device according to claim 3, characterized in that: The color ribbon is provided with spot color blocks, and the spot color blocks are placed in the ink key area corresponding to the spot color part of the printed sheet.

5. A closed-loop control method for a printing device according to claim 1, characterized in that: In step S2, the scanning time of the scanner is 6 to 10 seconds.

6. A closed-loop control method for a printing device according to claim 1, characterized in that: In the step S3, the controller processing module includes a printing signal processing module, a printing signal transmission module and a printing signal communication module.

7. A closed-loop control method for a printing device according to claim 6, characterized in that: The printing signal processing module includes a power module, a radio frequency amplification module, a filtering module, a radio frequency detection module and a display control module, and the display control module is equipped with a touch screen interface.

8. A closed-loop control method for a printing device according to any one of claims 1 to 7, characterized in that: In step S5, the feedback correction module includes a plurality of feedback units, and the control end of each feedback unit is respectively connected to a different printing control point.