CN110696481A - Automatic plate aligning method of printing machine - Google Patents
Automatic plate aligning method of printing machine Download PDFInfo
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- CN110696481A CN110696481A CN201911031138.7A CN201911031138A CN110696481A CN 110696481 A CN110696481 A CN 110696481A CN 201911031138 A CN201911031138 A CN 201911031138A CN 110696481 A CN110696481 A CN 110696481A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
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Abstract
The invention provides an automatic plate aligning method of a printing machine, which is characterized in that a visual plate aligning system is used for collecting printing position information of each printing machine head, the position of one printing machine is used as a reference, a visual processor is used for measuring and calculating the deviation between the printing positions of the other printing machine heads and the reference position, the deviation value is transmitted to automatic plate aligning adjusting devices on the other printing machine heads through electric signals, and the positions of a screen frame on each printing machine head are adjusted by utilizing the positive and negative rotation of a motor arranged on the automatic plate aligning adjusting devices, so that the automatic plate aligning is realized. According to the method, a visual system is used for replacing manual plate alignment, a motor spindle is connected with a threaded rod for adjusting the plate alignment, the positive and negative rotation of the threaded rod is driven by the positive and negative rotation of the motor, the positive and negative rotation can be controlled manually from the outside by using a novel structure, and the positive and negative rotation is controlled by a configured industrial computer, so that the rapid plate alignment is realized, the time for manual plate alignment is saved, and the precision and the efficiency of the plate alignment are improved.
Description
Technical Field
The invention relates to the technical field of printing machine equipment, in particular to a printing machine register device, and specifically relates to an automatic register method of a printing machine.
Background
As is well known, the prior printing machine mainly prints products by an oval printing machine, but the prior printing machine, whether the oval printing machine or other printing machines, basically adopts manual plate alignment, when the same pattern is printed in the same batch, the manual labor is only one-time labor, and a lot of time and energy are needed for plate alignment, but when multiple batches of patterns are printed, the plate alignment is needed before each new pattern is printed, which is time-consuming and labor-consuming.
The Chinese patent discloses an invention patent with the name of 201820812618.1, which comprises a frame, wherein a cross beam is fixed at the upper end of the frame, the cross beam is connected with a first air cylinder through a fixing block close to the frame, the first air cylinder is fixed at the upper end of an air cylinder fixing block, a second air cylinder is fixed at the lower end of the air cylinder fixing block, the second air cylinder is connected with a fourth fixing block, a drag hook is arranged at the lower end of the fourth fixing block, the drag hook is connected with T-shaped iron, a screen plate is fixedly connected to the other end of the T-shaped iron, a positioning pin is fixedly arranged on the side face of the screen plate, an aluminum platen is arranged below the screen plate, a positioning groove is arranged at the upper end of the aluminum platen. Through verification, the plate alignment precision is low although the plate alignment by using the air cylinder can provide high efficiency.
Through market research, the elliptical printing machine has the advantages that in addition to the pneumatic register, the current machine head register of the printing machine does not have automatic register, and is only limited to manual adjustment register. The problem that manual register ubiquitous is just adjust inefficiency, if be equipped with 10 aircraft noses on an oval calico printing machine, then need adjust 10 aircraft noses on the corresponding printing plate in proper order, just can guarantee the printing precision of 10 aircraft noses printing in-process, wastes time and energy, and is inefficient.
I finally determines and develops a printing machine with an automatic plate aligning function through 1 and half years of research and development, and applies for patent for protection.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides an automatic plate aligning method of a printing machine, which utilizes a visual system to replace manual plate aligning, and has the first technical point in the technical field of the printing machine that a motor main shaft is connected with a threaded rod for adjusting the plate aligning, the positive rotation and the negative rotation of the threaded rod are driven by the positive rotation and the negative rotation of the motor, the positive rotation and the negative rotation can be controlled by external manual control through a novel structure, and the positive rotation and the negative rotation can be controlled by a configured industrial computer, so that the rapid plate aligning is realized, in addition, the traditional external adjusting nut is still reserved, the manual adjustment can be realized, the three adjustments are integrated, the full automation can be realized, the time for manual plate aligning is saved, and the precision and the efficiency for plate aligning are improved.
The technical scheme includes that the automatic plate aligning method of the printing machine is characterized in that a visual plate aligning system is used for collecting printing position information of each printing machine head, the position of one printing machine is used as a reference, a visual processor is used for measuring and calculating the deviation between the printing positions of the other printing machine heads and the reference position, the deviation value is transmitted to automatic plate aligning adjusting devices on the other printing machine heads through electric signals, and the positions of screen frames on the printing machine heads are adjusted through positive and negative rotation of motors arranged on the automatic plate aligning adjusting devices, so that automatic plate aligning is achieved.
The visual registration system comprises a light source for illumination, a lens and a camera for image acquisition, an image acquisition card for image transmission and an industrial computer for data processing.
Taking three-time printing for printing a three-color pattern as an example: three groups of independent printer head assemblies are needed for printing the three-color patterns, namely a number 1 printer, a number 2 printer and a number 3 printer, and the specific method comprises the following steps:
(1) firstly, printing a No. 1 mark point on a No. 1 printing plate by a No. 1 printing machine, wherein the No. 1 mark point is one or two '+' marks, after the No. 1 mark point is printed, when the No. 1 printing plate with the No. 1 mark point is moved to an image acquisition lens station of a visual register system, the No. 1 printing plate is subjected to image acquisition by an image acquisition lens and a camera, the No. 1 mark point on the No. 1 printing plate is used as a reference, and an image is transmitted to an industrial computer for storage by an image acquisition card for image transmission.
(2) Then, the number 2 mark point is printed on the number 2 printing plate by the number 2 printing machine, the number 2 mark point is the same as the number 1 mark point, and is one or two '+' marks, after the number 2 mark point is printed, when the number 2 printing plate with the number 2 mark point moves to the image collecting lens station of the visual register system, the image collecting lens and the camera collect the image of the number 2 printing plate, and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the industrial computer compares the mark of the number 2 mark point on the number 2 printing plate with the mark of the number 1 mark point, the industrial computer calculates the transverse and longitudinal distance of the printing position on the number 2 printing machine head, then the industrial computer sends a signal to the motor on the screen frame fixing and adjusting device on the number 2 printing machine, the motor realizes the superposition of the mark of the No. 2 mark point and the mark of the No. 1 mark point through positive and negative rotation adjustment, and completes the plate alignment action of the No. 2 printing machine.
(3) Finally, the number 3 mark point is printed on the number 3 printing plate by the number 3 printing machine, the number 3 mark point is the same as the number 1 mark point and is one or two '+' marks, after the number 3 mark point is printed, when the number 3 printing plate with the number 3 mark point moves to the image collecting lens station of the visual register system, the number 3 printing plate is collected by the image collecting lens and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the mark of the number 3 mark point on the number 3 printing plate is compared with the mark of the number 1 mark point by the industrial computer, the transverse and longitudinal distance of the printing position on the number 3 printing machine head is calculated by the industrial computer, then the industrial computer sends a signal to the motor on the screen frame fixing and adjusting device on the number 3 printing machine, the motor realizes the coincidence of the No. 3 mark point and the No. 1 mark point through positive and negative rotation regulation.
The industrial computer is also connected with a control panel for manually controlling the positive and negative rotation of the motor, and the manual adjustment of the motor can be realized by utilizing a control button on the control panel.
The manual adjusting knob is connected to the rotating shaft of the motor and used for manually adjusting the rotating shaft of the motor to rotate, and manual forward and backward rotation adjustment of the rotating shaft of the motor can be achieved through the manual adjusting knob, so that the internal transmission mechanism is driven to act.
The beneficial effects of the technical scheme are as follows: the biggest characteristics of this system are applied to calico printing machine technical field with present more advanced vision system, utilize the computer to replace artifical register to the contrast processing of image, the time of artifical register has been saved, the precision and the efficiency of register have been improved, utilize the electrical signal drive motor just reversal, replace artifical manual rotation adjust knob, utilize novel structure both can realize outside manual control just reversal, can be through the industrial computer control just reversal of configuration again, thereby realize quick register, still remain traditional outside adjusting nut in addition, can realize artifical manual regulation, collect three kinds of regulation in an organic whole, can realize whole automation.
Drawings
FIG. 1 is a control diagram of a visual imposition system.
Detailed Description
For convenience of explanation, the automatic plate aligning method of the printing machine of the invention is described in detail below with reference to fig. 1.
The technical scheme is that the method is used in the field of the register of the printing machine, the position of one printing machine is used as a reference, a vision processor is used for measuring and calculating the deviation between the printing position of each of the rest printing machine heads and the reference position, the deviation value is transmitted to automatic register adjusting devices on the rest printing machine heads through electric signals, and the positions of screen frames on the rest printing machine heads are adjusted by positive and negative rotation of motors arranged on the automatic register adjusting devices, so that the automatic register is realized.
The vision registration system comprises a light source 1 for illumination, a lens 2 and a camera 3 for image acquisition, an image acquisition card 4 for image transmission, and an industrial computer 5 for data processing, and of course, a vision processor can also be adopted, but because the processing speed of the current computer is higher, a higher-configuration control chip can be used to replace the vision processor, such as processors with equivalent performance like Intel CPUi3, CPUi5 and CPUi 7.
Taking three-time printing for printing three-color patterns as an example, three groups of independent printer head assemblies, namely a No. 1 printer, a No. 2 printer and a No. 3 printer, are required for printing the three-color patterns, and the specific method comprises the following steps:
(1) firstly, printing a No. 1 mark point on a No. 1 printing plate by a No. 1 printing machine, wherein the No. 1 mark point is one or two '+' marks, after the No. 1 mark point is printed, when the No. 1 printing plate with the No. 1 mark point is moved to an image acquisition lens station of a visual register system, the No. 1 printing plate is subjected to image acquisition by an image acquisition lens and a camera, the No. 1 mark point on the No. 1 printing plate is used as a reference, and an image is transmitted to an industrial computer for storage by an image acquisition card for image transmission.
(2) Then, the number 2 mark point is printed on the number 2 printing plate by the number 2 printing machine, the number 2 mark point is the same as the number 1 mark point, and is one or two '+' marks, after the number 2 mark point is printed, when the number 2 printing plate with the number 2 mark point moves to the image collecting lens station of the visual register system, the image collecting lens and the camera collect the image of the number 2 printing plate, and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the industrial computer compares the mark of the number 2 mark point on the number 2 printing plate with the mark of the number 1 mark point, the industrial computer calculates the transverse and longitudinal distance of the printing position on the number 2 printing machine head, then the industrial computer sends a signal to the motor 6 on the screen frame fixing and adjusting device on the number 2 printing machine, the motor 6 realizes the superposition of the mark of the No. 2 mark point and the mark of the No. 1 mark point through positive and negative rotation adjustment, and completes the plate alignment action of the No. 2 printing machine.
(3) Finally, the number 3 mark point is printed on the number 3 printing plate by the number 3 printing machine, the number 3 mark point is the same as the number 1 mark point and is one or two '+' marks, after the number 3 mark point is printed, when the number 3 printing plate with the number 3 mark point moves to the image collecting lens station of the visual register system, the number 3 printing plate is collected by the image collecting lens and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the mark of the number 3 mark point on the number 3 printing plate is compared with the mark of the number 1 mark point by the industrial computer, the transverse and longitudinal distance of the printing position on the number 3 printing machine head is calculated by the industrial computer, then the industrial computer sends a signal to the motor 6 on the screen frame fixing and adjusting device on the number 3 printing machine, the motor 6 realizes the coincidence of the No. 3 mark point and the No. 1 mark point through positive and negative rotation regulation.
The industrial computer is also connected with a control panel 7 for manually controlling the forward and reverse rotation of the motor, the manual adjustment of the motor can be realized by using control buttons on the control panel 7, the control of the forward and reverse rotation of the motor by using different switches is a mature circuit connection mode at present, and how to control the forward and reverse rotation of the motor by using a circuit is not repeated herein.
The manual adjusting knob for manually adjusting the rotation of the motor rotating shaft is connected to the rotating shaft of the motor, and manual forward and backward rotation adjustment of the motor rotating shaft can be achieved through the manual adjusting knob, so that the internal transmission mechanism is driven to act, namely, the rotating shaft of the motor is connected with the internal adjusting screw rod, and the manual adjusting knob extends outwards.
At present, the intelligentization is completely used in integrated chip manufacturing workshops such as mobile phones, computers and the like, wherein a vision system is widely applied, the vision system generally consists of an illumination system, an OCD (optical clear) camera or lens, an image acquisition card, an industrial computer and a control mechanism, and the machine vision system is used for replacing human eyes with a machine to carry out various measurements and judgments. The system is an important branch of computer science, integrates the technologies of optics, mechanics, electronics, computer software and hardware and the like, and relates to a plurality of fields of computers, image processing, mode recognition, artificial intelligence, signal processing, optical-mechanical-electrical integration and the like. The rapid development of image processing, pattern recognition and other technologies also greatly promotes the development of machine vision.
A typical industrial machine vision system includes: a light source, a lens (a fixed focus lens, a zoom lens, a telecentric lens, a microscope lens), a camera (including a CCD camera and a COMS camera), an image processing unit (or an image capturing card), image processing software, a monitor, a communication/input/output unit, and the like.
The machine vision detection system adopts a CCD camera to convert a detected target into an image signal, transmits the image signal to a special image processing system, converts the image signal into a digital signal according to information such as pixel distribution, brightness, color and the like, performs various operations on the signal by the image processing system to extract characteristics of the target, such as area, quantity, position and length, and outputs results according to preset allowance and other conditions, such as size, angle, number, qualification/disqualification, existence/nonexistence and the like, thereby realizing the automatic identification function.
Machine vision systems are characterized by increased production flexibility and automation. In some dangerous working environments which are not suitable for manual operation or occasions which are difficult for manual vision to meet the requirements, machine vision is commonly used to replace the manual vision; meanwhile, in the process of mass industrial production, the efficiency of checking the product quality by using manual vision is low, the precision is not high, and the production efficiency and the automation degree of production can be greatly improved by using a machine vision detection method. And the machine vision is easy to realize information integration, and is a basic technology for realizing computer integrated manufacturing. The product can be measured, guided, detected and identified on the fastest production line, and the production task can be finished with guaranteed quality and quantity. Therefore, in modern automated production processes, machine vision systems are widely used in the fields of condition monitoring, finished product inspection, and quality control.
In the industrial application, the machine vision technology is used for replacing manpower in the industries of pharmacy, packaging, electronics, automobile manufacturing, semiconductors, textiles, tobacco, transportation, logistics and the like, and the production efficiency and the product quality can be improved. For example, in the logistics industry, the machine vision technology can be used for sorting and classifying the express, manual sorting of most express companies can be avoided, the damage rate of articles is reduced, the sorting efficiency can be improved, and the manual labor is reduced.
Illumination: is an important factor influencing the input of a machine vision system, and directly influences the quality and application effect of input data. Since there is no general machine vision lighting, the corresponding lighting device is selected for each specific application instance to achieve the best results. The light source can be divided into visible light and invisible light. Several visible light sources commonly used are white lamps, fluorescent lamps, mercury lamps and sodium lamps. The visible light has the disadvantage that the light energy does not remain stable. How to keep the light energy stable to a certain extent is a problem which needs to be solved urgently in the practical process. On the other hand, the ambient light may affect the image quality, so the shielding method can be used to reduce the effect of the ambient light. The lighting system can be divided into: back lighting, forward lighting, structured light, and stroboscopic lighting, among others. Among them, the back lighting is that the measured object is placed between the light source and the camera, which has the advantage of obtaining high contrast images. The forward illumination is such that the light source and the camera are located on the same side of the object to be measured, in a manner that facilitates installation. The structured light illumination is to project a grating or a line light source and the like onto a measured object, and demodulate three-dimensional information of the measured object according to distortion generated by the grating or the line light source and the like. The stroboscopic illumination is to irradiate high-frequency light pulses on an object, and the shooting of a camera is required to be synchronous with a light source.
Lens FOV (field Of Vision) = required resolution subpixel Camera size/PRTM (part measurement tolerance ratio) lens selection Note ① focal length ② target height ③ image height ④ magnification ⑤ image to target distance ⑥ center point/node ⑦ distortion
A camera: according to different standards, the method can be divided into the following steps: standard resolution digital cameras and analog cameras, etc. Different cameras and high-resolution cameras are selected according to different practical application occasions: line scanning CCD and planar array CCD; monochrome cameras and color cameras.
An image acquisition card: the image acquisition card is only a component of the complete machine vision system, but it plays a very important role. The image acquisition card directly determines the interface of the camera: black and white, color, analog, digital, and the like.
Typically a PCI or AGP compatible capture card, can quickly transfer images to computer memory for processing. Some acquisition cards have a built-in multi-way switch. For example, 8 different video cameras may be connected and then tell the acquisition card to capture the information with that one camera. Some acquisition cards have built-in digital inputs to trigger the acquisition card to capture, and the digital output port triggers the gate when the acquisition card captures an image.
A visual processor: the vision processor integrates the acquisition card and the processor. In the past, when the computer speed was slow, the vision processor was adopted to accelerate the vision processing task. At present, the acquisition card can quickly transmit images to the memory, and the computer is much faster, so that the vision processor is less at present.
While the preferred embodiments of the present invention have been described in detail, it should be apparent that many changes can be made within the inventive concept of the present invention, and it is intended that all changes that can be made within the inventive concept of the present invention are encompassed by the present invention.
Claims (5)
1. An automatic plate aligning method of a printing machine is characterized in that: the visual register system is used for collecting the printing position information of each printing machine head, the position of one printing machine is used as a reference, the visual processor is used for measuring and calculating the deviation between the printing position of each printing machine head and the reference position, the deviation value is transmitted to the automatic register adjusting devices on the other printing machine heads through electric signals, and the motor arranged on the automatic register adjusting devices is used for regulating the positions of the screen frames on the printing machine heads in a positive and negative rotation mode, so that automatic register is realized.
2. The automatic plate aligning method of a printing machine according to claim 1, which is characterized in that: the visual registration system comprises a light source for illumination, a lens and a camera for image acquisition, an image acquisition card for image transmission and an industrial computer for data processing.
3. The automatic plate aligning method of a printing machine according to claim 2, which is characterized in that: taking three-time printing for printing a three-color pattern as an example: three groups of independent printer head assemblies are needed for printing the three-color patterns, namely a number 1 printer, a number 2 printer and a number 3 printer, and the specific method comprises the following steps:
(1) firstly, printing a No. 1 mark point on a No. 1 printing plate by a No. 1 printing machine, wherein the No. 1 mark point is one or two '+' marks, after the No. 1 mark point is printed, when the No. 1 printing plate with the No. 1 mark point moves to an image acquisition lens station of a visual register system, an image acquisition lens and a camera are used for carrying out image acquisition on the No. 1 printing plate, the No. 1 mark point on the No. 1 printing plate is used as a reference, and an image is transmitted to an industrial computer for storage by an image acquisition card for image transmission;
(2) then, the number 2 mark point is printed on the number 2 printing plate by the number 2 printing machine, the number 2 mark point is the same as the number 1 mark point, and is one or two '+' marks, after the number 2 mark point is printed, when the number 2 printing plate with the number 2 mark point moves to the image collecting lens station of the visual register system, the image collecting lens and the camera collect the image of the number 2 printing plate, and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the industrial computer compares the mark of the number 2 mark point on the number 2 printing plate with the mark of the number 1 mark point, the industrial computer calculates the transverse and longitudinal distance of the printing position on the number 2 printing machine head, then the industrial computer sends a signal to the motor on the screen frame fixing and adjusting device on the number 2 printing machine, the motor realizes the superposition of the mark of the No. 2 mark point and the mark of the No. 1 mark point through positive and negative rotation regulation, and completes the plate alignment action of the No. 2 printing machine;
(3) finally, the number 3 mark point is printed on the number 3 printing plate by the number 3 printing machine, the number 3 mark point is the same as the number 1 mark point and is one or two '+' marks, after the number 3 mark point is printed, when the number 3 printing plate with the number 3 mark point moves to the image collecting lens station of the visual register system, the number 3 printing plate is collected by the image collecting lens and the image is transmitted to the industrial computer by the image collecting card for image transmission, then the mark of the number 3 mark point on the number 3 printing plate is compared with the mark of the number 1 mark point by the industrial computer, the transverse and longitudinal distance of the printing position on the number 3 printing machine head is calculated by the industrial computer, then the industrial computer sends a signal to the motor on the screen frame fixing and adjusting device on the number 3 printing machine, the motor realizes the coincidence of the No. 3 mark point and the No. 1 mark point through positive and negative rotation regulation.
4. The automatic plate aligning method of a printing machine according to claim 2, which is characterized in that: the industrial computer is also connected with a control panel for manually controlling the positive and negative rotation of the motor, and the manual adjustment of the motor can be realized by utilizing a control button on the control panel.
5. The automatic plate aligning method of a printing machine according to claim 2, which is characterized in that: the manual adjusting knob is connected to the rotating shaft of the motor and used for manually adjusting the rotating shaft of the motor to rotate, and manual forward and backward rotation adjustment of the rotating shaft of the motor can be achieved through the manual adjusting knob, so that the internal transmission mechanism is driven to act.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111532014A (en) * | 2020-05-08 | 2020-08-14 | 深圳诚拓数码设备有限公司 | Automatic nesting printing machine and automatic nesting method |
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| 肖世昌等: "基于机器视觉的单色印刷机套印***研究开发", 《印刷杂志》 * |
| 黄朝丽等: "新型平网印花机自动对花***的研究", 《染整技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111532014A (en) * | 2020-05-08 | 2020-08-14 | 深圳诚拓数码设备有限公司 | Automatic nesting printing machine and automatic nesting method |
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