CN113183625A - Stock detection device and oval calico printing machine - Google Patents
Stock detection device and oval calico printing machine Download PDFInfo
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- CN113183625A CN113183625A CN202110444283.9A CN202110444283A CN113183625A CN 113183625 A CN113183625 A CN 113183625A CN 202110444283 A CN202110444283 A CN 202110444283A CN 113183625 A CN113183625 A CN 113183625A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/16—Printing tables
- B41F15/18—Supports for workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Quality & Reliability (AREA)
- Textile Engineering (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Signal Processing (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention provides a printing stock detection device and an elliptical printing machine, wherein the printing stock detection device comprises: the printing device comprises a printing table plate, a support arranged on one side of the printing table plate, an image acquisition device arranged on the support and facing the printing table plate, a light source and an image processing device connected with the image acquisition device, wherein a light transmission part is arranged on the printing table plate, a supporting surface used for supporting a printing stock is formed at the top of the light transmission part, the acquisition end of the image acquisition device faces the supporting surface, and light rays emitted by the light source sequentially penetrate through the light transmission part and the supporting surface from the bottom of the light transmission part and then enter the acquisition end of the image acquisition device. The printing stock detection device disclosed by the invention realizes the damage detection of the printing stock, avoids the need of manual naked eye judgment of workers, reduces manpower and material resources and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a printed material detection device and an elliptical printing machine.
Background
On the printing machine, the printing stock is various substances which can receive ink or absorb pigment and present pictures and texts. During operation, a printing stock is laid on the printing platen, then the printing platen is moved to the printing mechanism through the driving mechanism for printing operation, and if the printing stock is damaged, defective products are generated during printing.
At present, the laying of the printing stock in the industry is manually operated, and workers need to check the printing stock when laying, but for fine damage, the identification speed is slow, the working strength is high, and misjudgment is easy to occur.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a printing stock detection device and an elliptical printing machine.
One embodiment of the present invention provides a substrate testing apparatus comprising: the printing device comprises a printing platen, a support arranged on one side of the printing platen, an image acquisition device arranged on the support and facing the printing platen, a light source and an image processing device connected with the image acquisition device, wherein a light transmission part is arranged on the printing platen, a supporting surface used for supporting a printing stock is formed at the top of the light transmission part, the acquisition end of the image acquisition device faces the supporting surface, and light rays emitted by the light source sequentially penetrate through the light transmission part and the supporting surface from the bottom of the light transmission part and then enter the acquisition end of the image acquisition device;
the image acquisition device is used for acquiring a detection image with a printing stock;
the image processing device is used for determining the gray value, the brightness value or the brightness value of the printing stock in the detection image and judging whether the printing stock is damaged or not according to the gray value, the brightness value or the brightness value in the detection image.
Compared with the prior art, the printing stock detection device has the advantages that the light transmission part is arranged on the printing bedplate, so that light can be transmitted from the bottom of the printing stock, the positions shielded by the printing stock and not shielded by the printing stock have different brightness, the position with high brightness is the position where the printing stock is damaged and lost, and the gray value of a detection image can be changed due to the different brightness, so that whether the printing stock is damaged or not can be judged, the damage detection on the printing stock is realized, the condition that workers need to judge by naked eyes is avoided, manpower and material resources are reduced, and the production efficiency is improved.
Further, the image processing device is configured to acquire a maximum gray value and a minimum gray value of the printing stock in the detection image, and determine a difference between the maximum gray value and the minimum gray value, where if the difference is higher than a reference value, the printing stock is damaged.
Further, the image acquisition device is arranged above the light transmission part, and the light source is arranged below the light transmission part and is arranged opposite to the image acquisition device.
Further, the light source is an annular light source.
Further, the printing stock detection device also comprises a plurality of baffles which are arranged around the light source, and the baffles form a light outlet facing the light transmission part together.
Furthermore, one surface of the baffle facing the light source is a light reflecting surface.
Further, the printed material detection device also comprises an alarm connected with the image processing device, and when the gray value is higher than a reference gray value, the alarm sends out an alarm signal.
Further, a light shield arranged around the light transmission part is further arranged on the support, and the image acquisition device is arranged in the light shield.
Another embodiment of the present invention provides an elliptical printing machine, comprising: the printing press comprises a machine frame, an elliptical guide rail arranged on the machine frame, a driving mechanism arranged on the machine frame, a plurality of printing devices arranged on the machine frame in sequence along the elliptical guide rail, and the printing stock detection device, wherein a printing platen is movably arranged on the elliptical guide rail, and the driving mechanism drives the printing platen to move along the elliptical guide rail.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a substrate testing apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic structural view of a baffle plate according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an elliptical printing machine according to another embodiment of the invention.
Description of reference numerals:
10. a printing platen; 11. a bedplate frame; 20. a support; 30. an image acquisition device; 40. a light source; 50. a baffle plate; 51. a light-reflecting surface; 60. a light shield; 71. a frame; 72. an elliptical guide rail; 73. a printing device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, it is a schematic structural diagram of an object testing device according to an embodiment of the present invention, the object testing device includes: the image processing device comprises a printing platen 10, a support 20 arranged on one side of the printing platen 10, an image acquisition device 30 arranged on the support 20 and facing the printing platen 10, a light source 40 and an image processing device connected with the image acquisition device 30.
The printing platen 10 is provided with a light-transmitting part, a supporting surface for supporting a printing stock is formed at the top of the light-transmitting part, the collecting end of the image collecting device 30 faces the supporting surface, and light rays emitted by the light source 40 sequentially pass through the light-transmitting part and the supporting surface from the bottom of the light-transmitting part and then enter the collecting end of the image collecting device 30. In the present embodiment, a platen frame 11 for connecting to a guide rail of the decorating machine is further connected to the printing platen 10, and a connecting portion that engages with the guide rail is formed on the platen frame 11. The printing platen 10 may be entirely or partially formed with a light transmitting portion, and the material of the light transmitting portion may be selected according to actual needs, and for example, a transparent material such as an acrylic plate or a glass plate is used.
The image acquisition device 30 is used for acquiring a detection image with a printing stock; the image processing device is used for determining the gray value of the printing stock in the detection image and judging whether the printing stock is damaged or not according to the gray value in the detection image. It should be noted that, the specific manner of determining the printing material according to the gray scale value in the test image may be designed according to actual needs, for example, in some alternative embodiments, the image processing apparatus is configured to obtain a maximum gray scale value and a minimum gray scale value of the printing material in the test image, and determine a difference value between the maximum gray scale value and the minimum gray scale value, where, based on that the printing material may have uneven thickness and thus have different gray scales at different positions, if the printing material is not damaged, the difference value between the maximum gray scale value and the minimum gray scale value of the printing material in the test image should be smaller, if the printing material is damaged, a position with higher brightness will appear, the gray scale value corresponding to the position in the test image is higher, and the difference value from the gray scale value at other positions of the printing material will be larger, and therefore if the difference value is higher than the reference value, it indicates that the substrate is broken. Of course, the gray value reference range of the printing stock in the image can also be obtained in advance, during detection, whether each pixel point at the position of the printing stock in the detected image is in the reference range or not is compared, and if not, the printing stock is damaged. Certainly, when the printing stock needs to have some through holes due to the structure, the printing stock in the detection image can be divided into a plurality of areas, then the average gray value of the areas is obtained, and whether the printing stock is damaged or not is judged by judging whether the average gray value is higher than a reference value or not. In addition, it should be noted that in some other images, there are different measurement values corresponding to the gray values one to one, such as luminance values, brightness values, etc., where the RGB image may be converted into a brightness value in HSV chromaticity space, and whether the substrate is damaged or not may be determined based on the brightness value.
In some alternative embodiments, the image capturing device 30 is disposed above the light-transmitting portion, and the light source 40 is disposed below the light-transmitting portion and is arranged opposite to the image capturing device 30, because the printed material has a certain thickness, if the image capturing device 30 is disposed on a side of the light-transmitting portion and is not opposite to the light source 40, the light may be blocked by an inner wall of a light channel formed at the damaged position of the printed material, and the image capturing device 30 may be disposed right above the printed material as much as possible to more accurately capture the light transmitted through the damaged position of the printed material.
In some alternative embodiments, the light source 40 is a ring-shaped light source 40, which is advantageous for providing sufficient light source 40, and the light source 40 preferably uses white light.
In some alternative embodiments, the substrate testing device further comprises a plurality of baffles 50 arranged around the light source 40, and the baffles 50 together form a light outlet facing the light-transmitting portion, thereby functioning as a converging light source 40.
In some alternative embodiments, the substrate testing device includes at least 4 baffles 50, and the side edges of the baffles 50 are connected to the side edges of the adjacent baffles 50, and in this embodiment, the number of the baffles 50 is 4, and each of the baffles is a flat plate, and surrounds each other to form a space with a rectangular cross section. Of course, the baffle 50 may also be an arc surrounding the light source.
Referring to fig. 2, which is a schematic structural diagram of a baffle according to an embodiment of the present invention, in some alternative embodiments, a surface of the baffle 50 facing the light source 40 is a reflective surface 51, so as to increase the intensity of the light source 40.
In some optional embodiments, the substrate detection device further comprises an alarm connected to the image processing device, and when the gray value is higher than a reference gray value, the alarm sends out an alarm signal to remind a worker that the substrate is damaged and needs to be replaced. It should be noted that the alarm signal may be selected according to the actual working scene, for example, the alarm signal may be one or more of a light signal, a sound signal and a vibration signal.
In some optional embodiments, a light shield 60 arranged around the light-transmitting portion is further disposed on the support 20, and the image capture device 30 is disposed in the light shield 60, so that the light shield 60 can reduce interference from ambient light, prevent ambient light from irradiating the surface of the printing material to increase the brightness of the surface of the printing material, and prevent the gray value of the printing material in the detected image from increasing to cause erroneous judgment.
Referring to fig. 3, it is a schematic structural diagram of an elliptical printing machine according to another embodiment of the present invention, where the substrate detecting device can be applied to an elliptical printing machine, the elliptical printing machine includes: the printing machine comprises a machine frame 71, an elliptical guide rail 72 arranged on the machine frame 71, a driving mechanism arranged on the machine frame 71, a plurality of printing devices 73 arranged on the machine frame 71 along the elliptical guide rail 72 in sequence, and the printing object detection device, wherein the printing platen 10 is movably arranged on the elliptical guide rail 72, and the driving mechanism drives the printing platen 10 to move along the elliptical guide rail 72. Preferably, the support 20, the image acquisition device 30 and the light source 40 can be arranged at a loading station, and the inspection can be carried out after the object to be printed has been laid on the printing platen 10.
In some alternative embodiments, the driving mechanism is connected to the image processing apparatus, and when the gray value is higher than a reference gray value, it indicates that there is a damaged substrate and it needs to be replaced, so the driving mechanism stops driving the printing platen 10 and replaces the substrate for the next test. When the gray value is not higher than the reference gray value, it indicates that the printing material is not damaged, and the driving mechanism drives the printing platen 10 to move to the printing device 73 for the next process.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An object testing device, comprising: the printing device comprises a printing platen, a support arranged on one side of the printing platen, an image acquisition device arranged on the support and facing the printing platen, a light source and an image processing device connected with the image acquisition device, wherein a light transmission part is arranged on the printing platen, a supporting surface used for supporting a printing stock is formed at the top of the light transmission part, the acquisition end of the image acquisition device faces the supporting surface, and light rays emitted by the light source sequentially penetrate through the light transmission part and the supporting surface from the bottom of the light transmission part and then enter the acquisition end of the image acquisition device;
the image acquisition device is used for acquiring a detection image with a printing stock;
the image processing device is used for determining the gray value, the brightness value or the brightness value of the printing stock in the detection image and judging whether the printing stock is damaged or not according to the gray value, the brightness value or the brightness value in the detection image.
2. The substrate testing device of claim 1, wherein: the image processing device is used for acquiring the maximum gray value and the minimum gray value of the printing stock in the detection image, determining the difference value between the maximum gray value and the minimum gray value, and if the difference value is higher than a reference value, the printing stock is damaged.
3. The substrate testing device of claim 1, wherein: the image acquisition device is arranged above the light transmission part, and the light source is arranged below the light transmission part and is arranged opposite to the image acquisition device.
4. The substrate testing device of claim 1, wherein: the light source is an annular light source.
5. The substrate testing device of any one of claims 1 to 4, wherein: the printing stock detection device also comprises a plurality of baffles which are arranged around the light source, and the baffles form a light outlet facing the light transmission part together.
6. The substrate testing device of claim 5, wherein: one surface of the baffle facing the light source is a light reflecting surface.
7. The substrate testing device of any one of claims 1 to 4, wherein: the printed material detection device further comprises an alarm connected with the image processing device, and when the gray value is higher than a reference gray value, the alarm sends out an alarm signal.
8. The substrate testing device of any one of claims 1 to 4, wherein: the support is further provided with a light shield arranged around the light transmission part, and the image acquisition device is arranged in the light shield.
9. An elliptical printing machine, comprising: the printing stock detection device comprises a machine frame, an elliptical guide rail arranged on the machine frame, a driving mechanism arranged on the machine frame, a plurality of printing devices arranged on the machine frame in sequence along the elliptical guide rail, and the printing stock detection device as claimed in any one of claims 1-8, wherein the printing platen is movably arranged on the elliptical guide rail, and the driving mechanism drives the printing platen to move along the elliptical guide rail.
10. Elliptical printing machine according to claim 9, characterized in that: the driving mechanism is connected with the image processing device, and stops driving the printing platen to move when the gray value is higher than a reference gray value; when the gray value is not higher than the reference gray value, the driving mechanism drives the printing bedplate to move to the printing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110444283.9A CN113183625B (en) | 2021-04-23 | 2021-04-23 | Stock detection device and oval calico printing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110444283.9A CN113183625B (en) | 2021-04-23 | 2021-04-23 | Stock detection device and oval calico printing machine |
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| CN113183625A true CN113183625A (en) | 2021-07-30 |
| CN113183625B CN113183625B (en) | 2022-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686876A (en) * | 2021-08-24 | 2021-11-23 | 华南农业大学 | Poultry egg crack detection method and device |
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| CN101090821A (en) * | 2004-03-23 | 2007-12-19 | 柯尼格及包尔公开股份有限公司 | Printing machines having at least one machine element that can be adjusted by a setting element |
| WO2011014282A2 (en) * | 2009-05-01 | 2011-02-03 | Trustees Of Boston University | High magnification spectral reflectance biosensing with discrete light sources |
| CN203772759U (en) * | 2013-11-27 | 2014-08-13 | 北京大恒图像视觉有限公司 | Gold stamping quality detection device |
| US20170214101A1 (en) * | 2013-12-10 | 2017-07-27 | Nissan Motor Co., Ltd. | Detection method and detection device |
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| CN113686876A (en) * | 2021-08-24 | 2021-11-23 | 华南农业大学 | Poultry egg crack detection method and device |
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| CN113183625B (en) | 2022-11-29 |
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