CN210604446U - Double-sided visual detection device for printed matter - Google Patents
Double-sided visual detection device for printed matter Download PDFInfo
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- CN210604446U CN210604446U CN201921420288.2U CN201921420288U CN210604446U CN 210604446 U CN210604446 U CN 210604446U CN 201921420288 U CN201921420288 U CN 201921420288U CN 210604446 U CN210604446 U CN 210604446U
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Abstract
The utility model discloses a two-sided visual detection device of printed matter, including first light source and the second light source that is used for illuminating two-sided printed matter, set up first optical reflector and the second optical reflector of both sides about two-sided printed matter, set up in the industry camera of two-sided printed matter one side, first optical reflector and second optical reflector are plane symmetry setting about the plane that two-sided printed matter was located, first optical reflector and second optical reflector all are 45 jiaos with the plane that two-sided printed matter was located, and first optical reflector and second optical reflector all face towards the industry camera, the camera lens axis of industry camera and the plane looks parallel and level that two-sided printed matter was located, and the axis of camera lens and the central line of first optical reflector and the central line of second optical reflector lie in the plane of the two-sided printed matter of same perpendicular to of locating. The utility model has the advantages that: and the front and back surfaces of the roll-fed printed product or a single printed product are photographed by using one linear array camera simultaneously, so that the equipment cost and the complexity are reduced.
Description
Technical Field
The utility model relates to a machine vision two-sided printed matter detects technical field, especially a printed matter two-sided visual detection device.
Background
The requirement of roll material double-sided printing products, especially clothes washing marks, on machine vision detection is increasing. The printed product has the characteristics that both the front side and the back side of the printed product are required to be detected, and has special detection requirements on the relative position relationship (i.e. overprinting relationship) of characters and patterns printed on the front side and the back side.
For such detection needs, the conventional solutions are: two line scanning cameras are adopted to respectively shoot front and back patterns of the printed product, the photoelectric sensor is triggered to send frame signals through color blocks on the double-sided printed product, and the front and back detection cameras simultaneously collect product images line by line. And the detection results of the collected images of the two cameras are merged through detection software.
However, this solution has the following drawbacks: firstly, the scheme adopts two sets of collecting equipment on the front side and the back side, and the cost is higher. The two cameras occupy larger space. In general, in an online printing machine or an offline inspection device, in order to pursue smaller space occupation and a compact mechanical structure, the reserved inspection space is relatively limited. A group of detection and acquisition equipment is respectively arranged on the front surface and the back surface of the two cameras, so that the installation space is probably limited and difficult to carry out.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming, provide a two-sided visual detection device of printed matter to reduce check out test set's cost and installation complexity.
The inventor also finds that due to the line scanning and collecting characteristics of the linear array cameras, if the images collected by the two cameras are corresponding to the actual product, the front image and the back image can be associated and matched with the actual product only by comprehensively processing the photoelectric signals, the line synchronization signals and the installation positions. However, all double-sided printed products are not suitable for photo-electric triggering image acquisition, and once there is no frame trigger signal corresponding to the actual product, the front and back images cannot be aligned accurately, which may cause dislocation and false alarm of the detection result. This approach is therefore not very versatile.
The purpose of the utility model is realized through the following technical scheme: a double-sided visual detection device for printed products comprises a first light source for illuminating the upper surface of a double-sided printed product, a second light source for illuminating the lower surface of the double-sided printed product, a first optical reflector arranged right above the double-sided printed product, a second optical reflector arranged right below the double-sided printed product, and an industrial camera arranged on one side of the double-sided printed product, wherein the first optical reflector and the second optical reflector are arranged in plane symmetry relative to the plane where the double-sided printed product is located, the first optical reflector and the second optical reflector form an angle of 45 degrees with the plane where the double-sided printed product is located, the first optical reflector and the second optical reflector face the industrial camera, the axis of the lens of the industrial camera is flush with the plane where the double-sided printing product is located, and the axis of the lens, the midline of the first optical reflector and the midline of the second optical reflector are positioned in the same vertical plane which is vertical to the plane of the double-sided printing product.
The first optical reflector and the second optical reflector have the best optical reflector effect, and if a common reflector is used, problems of poor image focusing, double images and the like can be caused. The angle between the reflector and the plane of the printed product must be accurate to 45 degrees, and the angle deviation can bring about the problem that the virtual image plane projected by the front surface and the back surface of the printed product is not on the same plane, thereby causing the problem of unclear focusing. The extension lines of the two optical reflectors and the horizontal extension line of the printed matter should intersect at one point, so that virtual images of the printed matter in the two optical reflectors are on the same plane, namely a virtual image surface. The widths of the first optical reflector and the second optical reflector are generally 30-40mm, but are not limited to the widths. The distance between the industrial camera and the double-sided printing product is related to data such as the selected camera, lens parameters of the camera, the maximum width of the double-sided printing product and the like.
The industrial camera shoots the front and back surfaces of a double-sided printing product such as a washing target through the first optical reflector and the second optical reflector, images of the front and back surfaces of one washing target appear in one scanned image at the same time, and the matching of the images of the front and back surfaces can be realized without any signal processing. And the quality and the relative position relation of the front and back images can be detected only by a common visual detection algorithm.
Preferably, the first light source and the second light source are both LED light sources or halogen light sources. Optionally, the distance between the first light source and the second light source and the double-sided printed product is 10-30mm, but is not limited thereto. Optionally, an included angle between the first light source and the plane where the second light source and the double-sided printing product are located is 45 to 60 degrees, which is not limited to this. The first light source and the second light source respectively shine from the front and back sides to the collection portion of the industrial camera.
The industrial camera is an industrial linear scanning camera, and an acquisition optical axis of the industrial linear scanning camera is vertical to a plane where the double-sided printed product is located; or the industrial camera is an area-array camera.
The first light source and the second light source are both strip-shaped LED light sources or linear LED light sources, and the strip-shaped light source with the diffusion plate is better in effect. The light-emitting end faces of the first light source and the second light source are parallel to the collection lines of the industrial linear scanning camera on the double-sided printed product, and the collection lines are positioned in the light band open-close fields of the first light source and the second light source.
The double-sided visual detection device for the printed product also comprises a supporting device for tightening the double-sided printed product. Optionally, the supporting device is a detection position supporting roller of a coil stock printing machine or a detection position supporting roller of a coil stock application platform. The double-sided printing product is wound on the detection position supporting roller to drive the double-sided printing product to continuously move through tension traction, so that the double-sided printing product keeps flat when being positioned between the reflectors of the double-sided visual detection device of the printing product. Optionally, the supporting device is a single paper feeding platform, and the double-sided printed product is driven by an air suction belt or a paper pressing belt, so that the double-sided printed product is kept flat when being positioned between the reflectors of the double-sided visual detection device for the printed product. In order to ensure that the printed product runs smoothly, an auxiliary structure which is beneficial to smooth paper feeding can be added between the two sections of belts. The gap between the two belt sections is not more than 50mm, and the gap as small as possible is beneficial to reducing the occurrence of the edge warping of the product.
When in use, the equipment can be arranged on a coil material online printing machine and between two paper feeding rollers, and the double-sided printed product moves horizontally. The industrial camera, the light source and the reflector are all fixed on the mounting bracket. And can increase the fixed bolster near two-sided printed matter collection point department to reduce the shake interference that the washing mark is unsettled and bring, guarantee that the printed matter is steady.
The utility model has the advantages of it is following:
the utility model provides an use a linear array camera to carry out the optics technical problem of clapping the picture simultaneously to the positive back of coil stock printed matter and sola class printed matter. Through 2 reflectors arranged at 45 degrees, images on the front and back surfaces of the printed matter are mirrored on a virtual image surface vertical to the plane of the printed matter, and one camera acquires images which need to be acquired by 2 cameras originally. The equipment cost and the complexity are reduced, the definition of the image is ensured, and the software processing difficulty is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the structure viewed from the right side of the present invention.
Fig. 3 is a schematic right-view structural diagram of another embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, a double-sided visual inspection device for printed products comprises a first light source 1 for illuminating the upper surface of a double-sided printed product, a second light source 2 for illuminating the lower surface of the double-sided printed product, a first optical reflector 3 arranged right above the double-sided printed product, a second optical reflector 4 arranged right below the double-sided printed product, and an industrial camera 5 arranged at one side of the double-sided printed product, wherein the first optical reflector 3 and the second optical reflector 4 are arranged in plane symmetry with respect to the plane of the double-sided printed product, the first optical reflector 3 and the second optical reflector 4 form an angle of 45 degrees with the plane of the double-sided printed product, the first optical reflector 3 and the second optical reflector 4 face the industrial camera 5, the lens axis of the industrial camera 5 is flush with the plane of the double-sided printed product, and the axis of the lens, the midline of the first optical reflector 3 and the midline of the second optical reflector 4 are positioned in the same vertical plane which is vertical to the plane of the double-sided printing product.
The first optical reflecting mirror 3 and the second optical reflecting mirror 4 are optimized in terms of optical reflecting mirror effect, and if a common reflecting mirror is used, problems such as poor image focusing and ghost images can be caused. The angle between the reflector and the plane of the printed product must be accurate to 45 degrees, and the angle deviation can bring about the problem that the virtual image surface 6 projected by the front surface and the back surface of the printed product is not on the same plane, thereby causing the problem of unclear focusing. The extension lines of the two optical reflectors and the horizontal extension line of the printed matter should intersect at one point, so that virtual images of the printed matter in the two optical reflectors are on the same plane, namely the virtual image plane 6. The widths of the first optical reflecting mirror 3 and the second optical reflecting mirror 4 are generally 30-40mm, but are not limited thereto. The distance between the industrial camera 5 and the double-sided print is related to data such as the selected camera, lens parameters of the camera, and the maximum width of the double-sided print.
The industrial camera 5 shoots the front and back surfaces of a double-sided printing product such as a washing target through the first optical reflector 3 and the second optical reflector 4, and an image of the front and back surfaces of one washing target appears in a scanned image at the same time, so that the matching of the front and back images can be realized without any signal processing. And the quality and the relative position relation of the front and back images can be detected only by a common visual detection algorithm.
Preferably, the first light source 1 and the second light source 2 are both LED light sources or halogen light sources. Optionally, the distance between the first light source 1 and the second light source 2 and the double-sided printed product is 10-30mm, but is not limited thereto. Optionally, an included angle between the first light source 1 and the second light source 2 and a plane where the double-sided printed product is located is 45 to 60 degrees, which is not limited to this. The first light source 1 and the second light source 2 are each illuminated from both front and back sides toward the collecting portion of the industrial camera 5.
The industrial camera 5 is an industrial linear scanning camera, and the acquisition optical axis of the industrial linear scanning camera is vertical to the plane where the double-sided printed product is located; or the industrial camera is an area-array camera.
The first light source 1 and the second light source 2 are both strip-shaped LED light sources or linear LED light sources, so that the strip-shaped light source with the diffusion plate is better in effect. The light-emitting end faces of the first light source 1 and the second light source 2 are parallel to the collection lines of the industrial linear scanning camera on the double-sided printed product, and the collection lines are positioned in the light band open-close fields of the first light source 1 and the second light source 2.
The double-sided visual detection device for the printed product also comprises a supporting device for tightening the double-sided printed product. Alternatively, as shown in fig. 2, the supporting device is a detection position supporting roller 8 of a roll material printing machine or a detection position supporting roller 8 of a roll material application platform. The double-sided printing product is wound on the detection position supporting roller 8 to drive the double-sided printing product to continuously move through tension traction, so that the double-sided printing product keeps flat when being positioned between the reflectors of the double-sided visual detection device of the printing product. Optionally, as shown in fig. 3, the supporting device is a single paper feeding platform 9, and the double-sided printed product is driven by an air suction belt or a paper pressing belt, so that the double-sided printed product is kept flat when being located between the reflectors of the double-sided visual inspection device for the printed product. In order to ensure that the printed product runs smoothly, an auxiliary structure which is beneficial to smooth paper feeding can be added between the two sections of belts. The gap between the two belt sections is not more than 50mm, and the gap as small as possible is beneficial to reducing the occurrence of the edge warping of the product.
When in use, the equipment can be arranged on a coil material online printing machine and between two paper feeding rollers, and the double-sided printed product moves horizontally. The industrial camera 5, the light source and the reflector are all fixed on the mounting bracket. And a fixed support plate 10 can be added near the collection point of the double-sided printed product, as shown in fig. 2, so as to reduce the shaking interference caused by the suspension of the washing mark and ensure the stability of the printed product.
The utility model has the advantages of it is following:
the utility model provides an use a linear array camera to carry out the optics technical problem of clapping the picture simultaneously to the positive back of coil stock printed matter and sola class printed matter. Through 2 reflectors placed at 45 degrees, images of the front and back surfaces of the printed matter are mirrored onto a virtual image surface 6 vertical to the plane of the printed matter, and one camera collects images which need 2 cameras to collect originally. The equipment cost and the complexity are reduced, the definition of the image is ensured, and the software processing difficulty is reduced.
Claims (9)
1. The utility model provides a two-sided visual inspection device of printed matter which characterized in that: the industrial camera comprises a first light source for illuminating the upper surface of a double-sided printing product, a second light source for illuminating the lower surface of the double-sided printing product, a first optical reflector arranged right above the double-sided printing product, a second optical reflector arranged right below the double-sided printing product, and an industrial camera arranged on one side of the double-sided printing product, wherein the first optical reflector and the second optical reflector are symmetrically arranged in a plane manner relative to the plane where the double-sided printing product is located, the first optical reflector and the second optical reflector are at an angle of 45 degrees with the plane where the double-sided printing product is located, the first optical reflector and the second optical reflector face the industrial camera, the axis of a lens of the industrial camera is parallel to the plane where the double-sided printing product is located, and the axis of the lens, the central line of the first optical reflector and the central line of the second optical reflector are located in the same vertical plane which is perpendicular to the plane where the double-sided printing product is located.
2. The double-sided visual inspection device for printed products according to claim 1, wherein: the first light source and the second light source are both LED light sources or halogen light sources.
3. The double-sided visual inspection device for printed products according to claim 1, wherein: the included angle between the first light source and the plane where the second light source and the double-sided printing product are located is 45-60 degrees.
4. A print duplex visual inspection apparatus according to any one of claims 1 to 3, wherein: the industrial camera is an industrial linear scanning camera, and an acquisition optical axis of the industrial linear scanning camera is vertical to a plane where the double-sided printed product is located; or the industrial camera is an area-array camera.
5. The double-sided visual inspection device for printed products according to claim 4, wherein: the first light source and the second light source are both strip-shaped LED light sources or linear LED light sources.
6. The double-sided visual inspection device for printed products according to claim 1, wherein: the double-sided visual detection device for the printed product also comprises a supporting device for tightening the double-sided printed product.
7. The double-sided visual inspection device for printed products according to claim 6, wherein: the supporting device is a detection position supporting roller of a coil stock printing machine or a detection position supporting roller of a coil stock application platform.
8. The double-sided visual inspection device for printed products according to claim 6, wherein: the supporting device is a single paper feeding platform.
9. The double-sided visual inspection device for printed products according to claim 8, wherein: the double-sided printing product is driven by an air suction belt or a paper pressing belt, and the gap between the two belts is not more than 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921420288.2U CN210604446U (en) | 2019-08-28 | 2019-08-28 | Double-sided visual detection device for printed matter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921420288.2U CN210604446U (en) | 2019-08-28 | 2019-08-28 | Double-sided visual detection device for printed matter |
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| CN210604446U true CN210604446U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281280A (en) * | 2020-09-09 | 2021-01-29 | 江阴市长泾花园毛纺织有限公司 | Preparation method of color space-dyed loop yarn double-faced woolen cloth and triangular prism visual detection device |
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2019
- 2019-08-28 CN CN201921420288.2U patent/CN210604446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281280A (en) * | 2020-09-09 | 2021-01-29 | 江阴市长泾花园毛纺织有限公司 | Preparation method of color space-dyed loop yarn double-faced woolen cloth and triangular prism visual detection device |
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