CN110744920A - Method and system for positioning printed product - Google Patents
Method and system for positioning printed product Download PDFInfo
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- CN110744920A CN110744920A CN201911038958.9A CN201911038958A CN110744920A CN 110744920 A CN110744920 A CN 110744920A CN 201911038958 A CN201911038958 A CN 201911038958A CN 110744920 A CN110744920 A CN 110744920A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- General Physics & Mathematics (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a method and a system for positioning a printed product. The method for positioning the printed product comprises the following steps: confirming a first position of a first identifier on the printed product according to a first image of the printed product; moving the print in a first manner based on the first position to align the first identifier with a preset first reference; confirming a second position of a second identifier on the printed product according to a second image of the printed product; and moving the printed product in a second mode based on the second position so as to align the second identifier with a preset second reference. The accurate positioning of the printed product in the printing post-processing process is realized, and the printing post-processing precision of the printed product is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of printing, in particular to a method and a system for positioning a printed product.
Background
The printing technology is mainly the whole process of printing and copying visual information, including prepress, printing, post-press processing, sending and the like, and characters and pictures can be copied in batches. In the actual printing process, for the printing precision is higher, mainly rely on the printing material, for example the edge of paper carries out the location, carries out the printing and the post-press processing to the paper, includes: local glazing, cutting, folding, die cutting, gold stamping and the like.
However, in the actual printing process, because the paper has different sizes, errors such as printing or cutting after printing easily occur through the positioning of the edge of the paper, and unnecessary loss is caused to manufacturers.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for positioning a printed product to achieve accurate positioning of the printed product in the post-printing process.
In a first aspect, an embodiment of the present invention provides a method for positioning a print product, including the following steps:
confirming a first position of a first identifier on the printed product according to a first image of the printed product;
moving the print in a first manner based on the first position to align the first identifier with a preset first reference;
confirming a second position of a second identifier on the printed product according to a second image of the printed product;
and moving the printed product in a second mode based on the second position so as to align the second identifier with a preset second reference.
Preferably, before the confirming the first position of the first mark on the printed product according to the first image of the printed product, the method further comprises:
acquiring a first image of the printed product through a first camera;
before the confirming the second position of the second mark on the printed product according to the second image of the printed product, the method further comprises the following steps:
a second image of the print is acquired by a second camera.
Preferably, the distance between the first and second positions is equal to the distance between the first and second references.
Further, the first mark is a first cross line, and a first center point of the first cross line is a first position;
the second identification is a second twentieth line, and a second center point of the second twentieth line is a second location.
Further, the confirming the first position of the first mark on the printed product according to the first image of the printed product includes:
confirming a first coordinate of the first central point under a preset horizontal plane coordinate system;
said moving said print in a first manner based on said first position to align said first mark with a preset first reference comprises:
confirming a first relative position of the first center point and the first reference point on a horizontal plane according to a first reference coordinate of the preset first reference point in the horizontal coordinate system;
and controlling the printed product to move according to the first relative position so that the first central point is aligned with a preset first reference.
Further, the confirming a second position of a second identifier on the printed product according to a second image of the printed product includes:
confirming a second coordinate of the second central point under a preset horizontal plane coordinate system;
moving the print in a second manner based on the second position to align the second mark with a preset second reference, comprising:
confirming the angle of the printed product to be rotated according to a second reference coordinate of the preset second reference in the horizontal coordinate system, the first reference coordinate and the second coordinate;
and rotating the printed product according to the angle to align the second central point with a preset second reference.
Preferably, the first mark is a first four-color cross line, and a first central point of the first four-color cross line is a first position;
the second mark is a second four-color cross hair, and a second center point of the second four-color cross hair is a second position.
In a second aspect, an embodiment of the present invention further includes a print positioning system, including: the printing product positioning method comprises the steps that when the printing product is processed after printing, the workbench, the air suction device, the camera device, the light source device and the calculation control system are used for positioning the printing product.
Specifically, the work table includes: the device comprises a screen printing plate, a translation platform and a rotating platform;
the translation platform is positioned above the rotating platform and comprises at least one gap for connecting an air suction device;
the image pickup apparatus includes: a first camera and a second camera;
the light source device is arranged above the workbench and used for providing a light source required by the camera device during working.
Specifically, a first mark and a second mark are printed on the printed product;
the distance between the first mark and the second mark is the same as the distance between the first camera and the second camera.
According to the method and the system for positioning the printed product, provided by the embodiment of the invention, the printed product is moved in the first mode and the second mode respectively by confirming the coordinates of the first identifier and the second identifier on the printed product in the horizontal coordinate system, so that the first identifier is aligned with the preset first reference and the second identifier is aligned with the preset second reference, the accurate positioning of the printed product in the post-printing processing process is realized, and the post-printing processing accuracy of the printed product is improved.
Drawings
FIG. 1 is a flowchart illustrating a method for positioning a printed product according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a print positioning method according to a second embodiment of the present invention;
FIG. 3 is a schematic view of the initial position of the printed product according to the second embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a position of a printed product after moving in a first manner according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a position of a printed product after moving in a first manner according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a second mode of moving the printed product according to the second embodiment of the present invention;
FIG. 7 is a schematic view of a first/second quad-crosshairs in an alternative embodiment of the invention;
FIG. 8 is a schematic view of a first quadrilateral in an alternative embodiment of the present invention;
FIG. 9 is a schematic view of an nth quadrilateral in an alternative embodiment of the present invention;
fig. 10 is a schematic view of a print positioning system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It is also to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. And in order to avoid obscuring the invention with unnecessary detail, only the structures and/or process steps that are germane to the scheme according to the present invention are shown in the drawings, while other details that are not germane to the present invention are omitted.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first identifier may be termed a second identifier, and, similarly, a second identifier may be termed a first identifier, without departing from the scope of the present invention. The first identity and the second identity are both identities, but they are not the same identity. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a flowchart of a method for positioning a printed product according to an embodiment of the present invention, which can be applied to positioning a printed product in a post-printing process. The method for positioning the printed product provided by the embodiment of the invention comprises the following steps:
s110, confirming a first position of a first mark on the printed product according to the first image of the printed product.
Preferably, a horizontal coordinate system can be set on the plane of the printed product based on the preset origin.
Preferably, a first image of the print is taken with a first camera, such as: shooting a first image of the printed product by using a first CCD camera, wherein the first image comprises a first identification image; a first marker in the first image is extracted and a first position of the first marker in the coordinate system is identified.
Preferably, a center point of the first marker may be determined first, and the center point is regarded as a first position of the first marker.
And S120, moving the printed product in a first mode based on the first position so as to align the first mark with a preset first reference.
Preferably, in the foregoing coordinate system, firstly, the coordinates of the first position and the first reference coordinates of the preset first reference are determined, and according to the relative position of the coordinates of the first position and the first reference coordinates in the horizontal coordinate system, the translation motion of the print is performed, so that the first identifier is aligned with the preset first reference.
And S130, confirming a second position of the second identifier on the printed product according to the second image of the printed product.
Preferably, a second image of the print is taken with a second camera, such as: shooting a second image of the printed product by adopting a first CCD camera, wherein the second image comprises a second identification image; and extracting a second mark in the second image and confirming a second position of the second mark in the horizontal coordinate system.
Preferably, a center point of the second marker may be determined first, and the center point may be regarded as a second position of the second marker.
And S140, moving the printed product in a second mode based on the second position so as to align the second identifier with a preset second reference.
Preferably, after the first identifier is aligned with the preset first reference, according to the coordinate of the second position, the first reference coordinate and the second reference coordinate of the preset second reference, an included angle of a connecting line between the second position and the first reference relative to a connecting line between the second reference and the first reference is determined, and according to the included angle, the printed product is rotated by taking the first reference as a rotating shaft until the second identifier is aligned with the preset second reference. Thereby realizing the accurate positioning of the printed product.
According to the method for positioning the printed product, provided by the embodiment of the invention, the coordinates of the first identifier and the second identifier on the printed product in the horizontal coordinate system are confirmed, and the printed product is moved in the first mode and the second mode respectively, so that the first identifier is aligned with the preset first reference and the second identifier is aligned with the preset second reference, the printed product is accurately positioned in the post-printing processing process, and the post-printing processing precision of the printed product is improved.
Example two
Fig. 2 is a flowchart of a method for positioning a printed product according to a second embodiment of the present invention, which can be applied to positioning a printed product in a post-printing process. The method for positioning the printed product provided by the embodiment of the invention comprises the following steps:
s210, acquiring a first image of the printed product through a first camera.
A first image of the print may be taken with a first camera, such as: a first image of the printed product is shot by a first CCD camera, and the first image is obtained. Wherein, the first image comprises a first identification image.
S220, confirming a first position of the first mark on the printed product according to the first image of the printed product.
Specifically, as shown in fig. 3, it is a schematic view of an initial position of the printed product just after the printed product reaches the printed product positioning device.
A horizontal coordinate system is set on the plane of the printed product based on the preset origin. The first marker of this embodiment is a first reticle 3. The Forstner positioning operator can be adopted to detect the first cross line, the intersection point of the two lines in the first cross line is obtained, and the first central point of the first cross line is obtained.
Further, the first center point is considered as the first position of the first marker 3.
And S230, moving the printed product in a first mode based on the first position so as to align the first mark with a preset first reference.
And taking a preset first reference 1 as a preset origin of the horizontal coordinate system. In the coordinate system, the print is moved in a first manner based on the coordinates of the first location. If the coordinates of the first position are (a, b), the distances that the printed product 5 needs to translate along the X-axis and Y-axis negative directions are calculated to be a and b, respectively, so that the printed product can be driven to move by controlling the translation platform in the printed product positioning device to translate along the X-axis and Y-axis negative directions according to the distances a and b, and the first position is aligned with the preset first reference 1, that is, the first mark 3 is aligned with the preset first reference 1. The schematic diagram of the position of the moved printing product is shown in fig. 4.
And S240, acquiring a second image of the printed product through a second camera.
A second image of the print may be taken with a second camera, such as: and shooting a second image of the printed product by using a second CCD camera, and acquiring the second image. Wherein the second image comprises a second identification image.
And S250, confirming a second position of the second identifier on the printed product according to the second image of the printed product.
Preferably, the distance between the first position and the second position is equal to the distance between the preset first reference and the preset second reference.
Specifically, the second identifier 4 is a twentieth line. The second twentieth line can be detected by a Forstner locator operator to obtain the intersection of the two lines in the second twentieth line, i.e. the second center point of the second twentieth line.
Further, the second center point is considered as the second position of the second marker 4.
And S260, moving the printed product in a second mode based on the second position so as to align the second identifier with a preset second reference.
In the coordinate system, the second reference coordinates of the preset second reference 2 are confirmed, and as shown in fig. 5, after the first mark 3 is aligned with the preset first reference 1, the print product is moved in the second manner based on the coordinates of the second position and the second reference coordinates. If the coordinates of the second position are (c, d) and the second reference coordinates are (e, f), calculating to obtain the angle of the printed product to be rotatedTherefore, as shown in fig. 6, the rotation platform in the print product positioning device can be controlled to rotate counterclockwise according to the angle θ and the arrow shown in fig. 6 to drive the print product to rotate, so that the second position is aligned with the preset second reference 2, that is, the second mark 4 is aligned with the preset second reference 2. Thereby realizing the accurate positioning of the printed product.
In the method for positioning the printed product provided in this embodiment, first, a first image including a first identifier and a second image including a second identifier are respectively obtained by using a first camera and a second camera; secondly, the coordinates of the first identification and the second identification on the printed product in the horizontal coordinate system are confirmed, and the printed product is moved in the first mode and the second mode respectively, so that the first identification is aligned with the preset first reference and the second identification is aligned with the preset second reference, the printed product is accurately positioned in the printing post-processing process, and the printing post-processing precision of the printed product is improved.
In an alternative embodiment, the first marker may be a first four-color cross; the second indicia may be a second four-color cross hair. Such as: blue, pinky, yellow and black cross lines.
Then, in step S220 and/or S250, confirming a first position of a first identifier on the printed product according to a first image of the printed product, and/or confirming a second position of a second identifier on the printed product according to a second image of the printed product includes:
step a, as shown in fig. 7, a Forstner positioning operator may be used to detect the first/second four-color cross lines, and the intersection points of two lines in the cyan, magenta, yellow, and black cross lines are obtained, that is, the first central point 100, the second central point 200, the third central point 300, and the fourth central point 400 of the cyan, magenta, yellow, and black cross lines are obtained.
Step B, as shown in fig. 8, determining coordinates a, B, C and D of the first center point 100, the second center point 200, the third center point 300 and the fourth center point 400 in the horizontal coordinate system, respectively.
And C, writing a program for the coordinate A, the coordinate B, the coordinate C and the coordinate D, and enabling the four points to be connected to form a first quadrangle S1 with the minimum area.
Step d, as shown in fig. 9, the midpoint of each side of the quadrangle obtained in step c is taken, and the newly obtained four midpoints are re-connected to form a second quadrangle with the second minimum area S2.
And d, circulating the step d until the area of the nth quadrangle Sn is smaller than a preset value, such as 0.1 square millimeter, stopping circulation, confirming the middle point of the finally obtained quadrangle graph, obtaining the first/second central points of the first/second four-color cross lines, and taking the position coordinates of the first/second central points as the first/second coordinates of the first/second positions to obtain the first/second positions.
By adopting the first four-color cross lines and the second four-color cross lines as the first marks and the second marks and respectively determining the first central points and the second central points, when the printed product is positioned based on the first marks and the second marks, the positioning error caused by bending of the edge of the printed product can be reduced.
EXAMPLE III
An embodiment of the present invention provides a printed product positioning system, as shown in fig. 10, which is a schematic diagram of a printed product positioning system in a third embodiment of the present invention, and includes: the air suction device comprises a workbench 10, an air suction device 20, a camera device 30, a light source device 40 and a calculation control system 50. When the printed matter is subjected to post-printing treatment, the printed matter can be positioned by the printed matter positioning method provided by any embodiment of the invention.
Specifically, the table 10 includes: silk screen printing screen, translation platform and rotary platform.
Preferably, the screen printing plate is moved away from the translation stage during positioning of the printed product to avoid obscuring the camera 30. And after the positioning of the printed product is finished, moving the printed product to the position above the translation platform so as to perform the post-printing treatment of the printed product.
Preferably, the translation platform is used for placing the printed product, and can be driven by a motor to perform horizontal translation according to an instruction of the calculation control system 50, so as to drive the printed product to translate in the horizontal direction. Wherein, the translation platform is located above the rotation platform, and comprises at least one gap for connecting with the air suction device 20. The rotary platform can rotate along the rotary shaft under the driving of the motor according to the instruction of the calculation control system 50, so as to drive the printed product to rotate in the horizontal direction.
Preferably, the air suction device 20 is disposed between the translation platform and the rotation platform, and is used for preventing the printed product from sliding between the translation platform and the air suction device under the action of air suction after the printed product reaches the translation platform.
Preferably, the image pickup device 30 includes: a first camera and a second camera. The first camera may be a first CCD camera that may capture a first image of the print, and the captured first image may then be processed in the computational control system 50. The second camera, which may be a second CCD camera, may capture a second image of the print, which may then be processed in the computational control system 50.
Preferably, the light source device 40 is an LED lighting lamp, and is disposed above the worktable 10 to provide a light source required by the operation of the image capturing device 30.
Preferably, a first mark and a second mark are printed on the printed product; the distance between the first mark and the second mark is the same as the distance between the first camera and the second camera. The first mark may be a first cross line, and the second mark may be a second cross line. The distance between the first marker and the second marker is the distance between the first center point of the first cross hair and the second center point of the second cross hair.
According to the printed product positioning system provided by the embodiment of the invention, the workbench, the air suction device, the camera device, the light source device and the calculation control system are arranged, so that the printed product positioning method provided by any embodiment of the invention can be realized, the accurate positioning of the printed product in the printing post-processing process is realized, and the printing post-processing precision of the printed product is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for positioning a printed product is characterized by comprising the following steps:
confirming a first position of a first identifier on the printed product according to a first image of the printed product;
moving the print in a first manner based on the first position to align the first identifier with a preset first reference;
confirming a second position of a second identifier on the printed product according to a second image of the printed product;
and moving the printed product in a second mode based on the second position so as to align the second identifier with a preset second reference.
2. The method of claim 1,
before the confirming the first position of the first mark on the printed product according to the first image of the printed product, the method further comprises the following steps:
acquiring a first image of the printed product through a first camera;
before the confirming the second position of the second mark on the printed product according to the second image of the printed product, the method further comprises the following steps:
a second image of the print is acquired by a second camera.
3. The method of claim 1, wherein the distance between the first and second locations is equal to the distance between the first and second references.
4. The method of claim 3,
the first mark is a first cross line, and a first center point of the first cross line is a first position;
the second identification is a second twentieth line, and a second center point of the second twentieth line is a second location.
5. The method of claim 4,
the confirming a first position of a first mark on the printed product according to a first image of the printed product comprises:
confirming a first position of the first central point under a preset horizontal plane coordinate system;
said moving said print in a first manner based on said first position to align said first mark with a preset first reference comprises:
confirming a first relative position of the first center point and the first reference point on a horizontal plane according to a first reference coordinate of the preset first reference point in the horizontal coordinate system;
and controlling the printed product to move according to the first relative position so that the first central point is aligned with a preset first reference.
6. The method of claim 5,
the confirming a second position of a second identifier on the printed product according to a second image of the printed product includes:
confirming a second position of the second central point under a preset horizontal plane coordinate system;
moving the print in a second manner based on the second position to align the second mark with a preset second reference, comprising:
confirming the angle of the printed product to be rotated according to a second reference coordinate of the preset second reference in the horizontal coordinate system, the first reference coordinate and the coordinate of the second position;
and rotating the printed product according to the angle to align the second central point with a preset second reference.
7. The method of claim 3,
the first mark is a first four-color cross line, and a first central point of the first four-color cross line is a first position;
the second mark is a second four-color cross hair, and a second center point of the second four-color cross hair is a second position.
8. A print positioning system, comprising:
work table, air suction device, camera device, light source device and calculation control system, when the printing product is processed after printing, the printing product is positioned by the method as claimed in any one of claims 1-7.
9. The system of claim 8,
the work bench includes: the device comprises a screen printing plate, a translation platform and a rotating platform;
the translation platform is positioned above the rotating platform and comprises at least one gap for connecting an air suction device;
the image pickup apparatus includes: a first camera and a second camera;
the light source device is arranged above the workbench and used for providing a light source required by the camera device during working.
10. The system of claim 9, wherein a first logo and a second logo are printed on the print;
the distance between the first mark and the second mark is the same as the distance between the first camera and the second camera.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112477410A (en) * | 2020-11-30 | 2021-03-12 | 浙江星淦科技有限公司 | Gilt version paper positioner |
| CN112571315A (en) * | 2020-11-30 | 2021-03-30 | 浙江星淦科技有限公司 | Gilt version paper positioner convenient to it is tight to press from both sides |
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| CN106972065A (en) * | 2017-03-03 | 2017-07-21 | 浙江爱旭太阳能科技有限公司 | The p-type PERC double-sided solar batteries and preparation method aligned using laser labelling |
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