CN113211981A - Digital printing deviation correction device and method - Google Patents

Digital printing deviation correction device and method Download PDF

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Publication number
CN113211981A
CN113211981A CN202110641968.2A CN202110641968A CN113211981A CN 113211981 A CN113211981 A CN 113211981A CN 202110641968 A CN202110641968 A CN 202110641968A CN 113211981 A CN113211981 A CN 113211981A
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China
Prior art keywords
printing
digital
stock
computer
coordinates
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Pending
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CN202110641968.2A
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Chinese (zh)
Inventor
陆利坤
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Beijing Institute of Graphic Communication
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Beijing Institute of Graphic Communication
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Priority to CN202110641968.2A priority Critical patent/CN113211981A/en
Publication of CN113211981A publication Critical patent/CN113211981A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10004—Still image; Photographic image

Abstract

The invention relates to a digital printing deviation correcting device and a method, the device comprises a position detection structure, an image sensor, a computer and a printing position adjusting mechanism, wherein the position detection structure detects the position of a printing stock on a paper feeding unit of a digital printing machine, the image sensor acquires an image of the printing stock, the computer acquires the coordinates of a positioning mark on the printing stock according to the position of the printing stock and the image, calculates the position deflection correction quantity of a printing box according to the coordinates of the positioning mark, and controls the printing position adjusting mechanism to adjust the printing position of the printing stock according to the position deflection correction quantity. The invention can automatically correct the printing position, ensure the accurate positioning of the printing stock during multiple times of printing and improve the printing precision; and the used mechanical structure is simple, the cost is low, the complexity of the mechanical structure of the equipment and the cost of the equipment are reduced, manual debugging is omitted, and the printing production efficiency is improved.

Description

Digital printing deviation correction device and method
Technical Field
The invention relates to the field of printing, in particular to a digital printing deviation correcting device and method.
Background
Many printed products require multiple successive prints on a substrate in order to achieve certain special printing effects. In order to ensure the quality of the printed matter, the accurate positioning of the printing stock must be ensured during multiple times of printing, otherwise, the patterns can be misplaced, and the quality of the printed matter is seriously influenced.
In the prior art, accurate positioning is mainly expected to be realized through a mechanical structure with higher precision, and the defects of complex structure, high cost, high failure rate, manual debugging and the like exist, so that the improvement of the printing production efficiency is restricted.
Disclosure of Invention
The invention aims to provide a digital printing deviation correcting device and a digital printing deviation correcting method, which are used for improving the printing precision and the printing production efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a digital printing offset correction apparatus, said apparatus comprising: the printing device comprises a position detection structure, an image sensor, a computer and a printing position adjusting mechanism;
a positioning mark is arranged on the printing stock;
the position detection structure and the image sensor are both connected with the computer; the position detection structure is used for detecting the position of a printing stock on a paper feeding unit of the digital printing machine and transmitting the position of the printing stock to the computer; the computer is used for controlling the image sensor to acquire the image of the printing stock when the position of the printing stock is received;
the computer is connected with the control end of the printing position adjusting mechanism, and the output end of the printing position adjusting mechanism is connected with a printing box of the digital printer; the computer is used for obtaining the coordinates of the positioning marks on the printing stock according to the position of the printing stock and the image, calculating the position deflection correction quantity of the printing box according to the coordinates of the positioning marks, and controlling the printing position adjusting mechanism to adjust the printing position of the printing box on the printing stock according to the position deflection correction quantity.
Further, the printing position adjustment mechanism includes: a motor;
the control end of the motor is connected with the computer, and the output shaft of the motor is connected with the printing box; the motor is used for adjusting the printing position of the printing box on the printing stock under the control of the computer.
Further, the printing position adjustment mechanism includes: a printing control chip;
the input end of the printing control chip is connected with the computer, and the output end of the printing control chip is connected with the printing box; the printing control chip is used for receiving the position deflection correction amount of the computer, correcting the preset printing position of the printing box according to the position deflection correction amount to obtain a corrected printing position, and controlling the printing box to print the printing stock according to the corrected printing position.
Further, the printing position adjustment mechanism further includes: a print data buffer;
the printing data buffer is arranged between the printing control chip and the computer, and is used for receiving and storing the position deflection correction of the computer and transmitting the position deflection correction to the printing control chip.
Further, the position detection structure is one or both of a photosensor and an encoder.
Further, the image sensor is one of a digital area camera or a digital line camera.
Further, the calculation formula of the position deflection correction amount of the print cartridge is xδ＝xN-xPAnd yδ＝yN-yP；
Wherein x isδAnd yδRespectively the abscissa and ordinate, x, of the position deflection correctionNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively, the expected position coordinates of the positioning markers.
A digital printing offset correction method, the method comprising:
acquiring the position and the image of a printing stock;
obtaining the current coordinates of the positioning marks on the printing stock by adopting a digital image processing algorithm according to the position and the image of the printing stock;
calculating the position deflection correction quantity of the printing box according to the current coordinates of the positioning marks;
and correcting the printing position of the printing stock according to the position deflection correction.
Further, the digital image processing algorithm includes: filtering, windowing, sharpening, and template matching.
Further, calculating a position deflection correction amount of the print cartridge according to the current coordinates of the positioning mark specifically includes:
acquiring the expected position coordinates of the positioning marks according to the typesetting requirements;
according to the current coordinates and the expected position coordinates of the positioning mark, using a formula xδ＝xN-xPAnd yδ＝yN-yPObtaining the position deflection correction quantity of the positioning mark as the position deflection correction quantity of the printing box;
wherein x isδAnd yδRespectively the abscissa and ordinate, x, of the position deflection correctionNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively, the expected position coordinates of the positioning markers.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a digital printing deviation correcting device and a digital printing deviation correcting method.A position detection structure detects the position of a printing stock on a paper feeding unit of a digital printing machine, an image sensor acquires an image of the printing stock, a computer obtains the coordinates of a positioning mark on the printing stock according to the position of the printing stock and the image, calculates the position deflection correction quantity of a printing box according to the coordinates of the positioning mark, and controls a printing position adjusting mechanism to adjust the printing position of the printing stock according to the position deflection correction quantity. The invention can automatically correct the printing position, ensure the accurate positioning of the printing stock during multiple times of printing and improve the printing precision; and the used mechanical structure is simple, the cost is low, the complexity of the mechanical structure of the equipment and the cost of the equipment are reduced, manual debugging is omitted, and the printing production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a digital printing deviation correction apparatus according to an embodiment of the present invention;
fig. 2 is a structural diagram of a digital printing deviation correction apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a digital printing offset correction method according to the present invention;
FIG. 4 is a flow chart of a digital printing offset correction method according to the present invention;
description of the symbols:
the printing device comprises an image sensor 1, a computer 2, a printing position adjusting mechanism 3, a printing data buffer 3-1, a printing control chip 3-2, a spray head 4 and a paper feeding unit 5.
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.
The invention aims to provide a digital printing deviation correcting device and a digital printing deviation correcting method, which are used for improving the printing precision and the printing production efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention corrects the printing of the printing stock on the digital printing machine, so that the accurate positioning of the printing stock is ensured during multiple times of printing. The digital printing machine comprises a paper feeding unit 5 and a printing box, wherein during printing, a printing stock is placed on the paper feeding unit 5 and moves along with the rotation of the paper feeding unit 5, a nozzle 4 is arranged in the printing box, and the nozzle 4 is used for printing the printing stock.
Example one
A digital printing deviation correcting apparatus, as shown in fig. 1, comprising: a position detection structure, an image sensor 1, a computer 2, and a printing position adjustment mechanism 3.
And a positioning mark is arranged on the printing stock.
The position detection structure and the image sensor 1 are both connected to a computer 2. The position detection structure is used for detecting the position of the printing stock on the paper feeding unit 5 of the digital printing machine and transmitting the position of the printing stock to the computer 2. The computer 2 is used to control the image sensor 1 to acquire an image of the printing substrate when receiving the position of the printing substrate.
The computer 2 is connected with the control end of the printing position adjusting mechanism 3, and the output end of the printing position adjusting mechanism 3 is connected with a printing box of the digital printer. The computer 2 is used for obtaining the coordinates of the positioning marks on the printing stock according to the position of the printing stock and the image, calculating the position deflection correction quantity of the printing box according to the coordinates of the positioning marks, and controlling the printing position adjusting mechanism 3 to adjust the printing position of the printing box on the printing stock according to the position deflection correction quantity.
The printing position adjusting mechanism includes: an electric motor. The control end of the motor is connected with the computer 2, and the output shaft of the motor is connected with the printing box. The motor is used to adjust the print position of the print cartridge to the print substrate under the control of the computer 2.
The position detection structure is one or two of a photoelectric sensor and an encoder.
Preferably, the image sensor 1 is one of a digital area camera or a digital line camera, the image sensor 1 is installed above the feeding device, and images are collected when the printing stock moves to a position right below the image sensor 1.
The calculation formula of the position deflection correction amount of the print cartridge is xδ＝xN-xPAnd yδ＝yN-yP。
Wherein x isδAnd yδRespectively the abscissa and ordinate, x, of the position deflection correctionNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively, the expected position coordinates of the positioning markers.
In this embodiment, the print cartridge is provided with a position adjusting mechanism, and the two-dimensional position of the print cartridge is controlled by a motor. And transmitting the image deflection correction parameters to a printing box, adjusting the position of the printing box in real time, and finally controlling the ink-jet printing head to execute offset correction.
The printing box is provided with a motor, the motor needs to meet certain positioning precision requirements, and the motor is electrically connected with the computer 2 and can be used for the computer 2 to issue correction parameters to the motor for position adjustment.
In production applications, the present embodiment requires a short delay for data transmission and processing, and therefore, the present embodiment is more suitable for applications where the position deviation is not changed too much and the printing speed is not too fast, such as low-speed web printing.
Example two
A digital printing deviation correcting apparatus, as shown in fig. 2, comprising: a position detection structure, an image sensor 1, a computer 2, and a printing position adjustment mechanism 3.
And a positioning mark is arranged on the printing stock.
The position detection structure and the image sensor 1 are both connected to a computer 2. The position detection structure is used for detecting the position of the printing stock on the paper feeding unit 5 of the digital printing machine and transmitting the position of the printing stock to the computer 2. The computer 2 is used to control the image sensor 1 to acquire an image of the printing substrate when receiving the position of the printing substrate.
The computer 2 is connected with the control end of the printing position adjusting mechanism 3, and the output end of the printing position adjusting mechanism 3 is connected with a printing box of the digital printer. The computer 2 is used for obtaining the coordinates of the positioning marks on the printing stock according to the position of the printing stock and the image, calculating the position deflection correction quantity of the printing box according to the coordinates of the positioning marks, and controlling the printing position adjusting mechanism 3 to adjust the printing position of the printing box on the printing stock according to the position deflection correction quantity.
The printing position adjusting mechanism includes: and a printing control chip 3-2. The input end of the printing control chip 3-2 is connected with the computer 2, and the output end of the printing control chip 3-2 is connected with the printing box. The printing control chip 3-2 is used for receiving the position deflection correction amount of the computer 2, correcting the preset printing position of the printing box according to the position deflection correction amount to obtain a corrected printing position, and controlling the printing box to print a printing stock according to the corrected printing position. And the spray head 4 in the print cartridge prints the printing stock according to the preset printing position.
The printing position adjusting mechanism further includes: print data buffer 3-1. The printing data buffer 3-1 is arranged between the printing control chip 3-2 and the computer 2, and the printing data buffer 3-1 is used for receiving and storing the position deflection correction of the computer 2 and transmitting the position deflection correction to the printing control chip 3-2.
The position detection structure is one or two of a photoelectric sensor and an encoder.
Preferably, the image sensor 1 is one of a digital area camera or a digital line camera, the image sensor 1 is installed above the feeding device, and images are collected when the printing stock moves to a position right below the image sensor 1.
The calculation formula of the position deflection correction amount of the print cartridge is xδ＝xN-xPAnd yδ＝yN-yP。
Wherein x isδAnd yδRespectively the abscissa and ordinate, x, of the position deflection correctionNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively, the expected position coordinates of the positioning markers.
And the typesetting editing software in the computer 2 adjusts the image data sent to the hardware board card according to the correction amount. The hardware board card is provided with a memory (printing data buffer 3-1) for buffering the image data issued by the typesetting editing software, the image data is processed by using the correction amount, and the processing process is completed by the typesetting editing software.
The embodiment needs a short delay in data transmission and processing in production application, so the technical scheme is more suitable for occasions with less large position offset change and less high printing speed, such as low-speed web printing.
EXAMPLE III
A digital printing offset correction method, as shown in fig. 3-4, the method comprising:
s101, acquiring the position and the image of a printing stock;
s102, obtaining the current coordinates of the positioning marks on the printing stock by adopting a digital image processing algorithm according to the position and the image of the printing stock;
s103, calculating the position deflection correction amount of the print cartridge according to the current coordinates of the positioning marks, and specifically comprises the following steps:
acquiring the expected position coordinates of the positioning marks according to the typesetting requirements;
using the formula x according to the current coordinates and the expected position coordinates of the positioning markδ＝xN-xPAnd yδ＝yN-yPObtaining a position deflection correction amount of the positioning mark as a position deflection correction amount of the print cartridge;
wherein x isδAnd yδRespectively the abscissa and ordinate, x, of the position deflection correctionNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively the expected position coordinates of the positioning mark;
and S104, correcting the printing position of the printing object according to the position deflection correction.
The digital image processing algorithm includes: filtering, windowing, sharpening, and template matching.
The invention has the beneficial effects that:
1. the invention can realize highly automatic printing deviation correction and reduce labor cost.
2. The invention can reduce the design and debugging precision requirements of the feeding device of the digital printing system, and can save the installation time and the maintenance cost.
The technical scheme provided by the invention has good precision performance in a low-speed printing scene, and can greatly improve the quality of printed matters.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A digital printing offset correction apparatus, comprising: the printing device comprises a position detection structure, an image sensor, a computer and a printing position adjusting mechanism;
a positioning mark is arranged on the printing stock;
the position detection structure and the image sensor are both connected with the computer; the position detection structure is used for detecting the position of a printing stock on a paper feeding unit of the digital printing machine and transmitting the position of the printing stock to the computer; the computer is used for controlling the image sensor to acquire the image of the printing stock when the position of the printing stock is received;
the computer is connected with the control end of the printing position adjusting mechanism, and the output end of the printing position adjusting mechanism is connected with a printing box of the digital printer; the computer is used for obtaining the coordinates of the positioning marks on the printing stock according to the position of the printing stock and the image, calculating the position deflection correction quantity of the printing box according to the coordinates of the positioning marks, and controlling the printing position adjusting mechanism to adjust the printing position of the printing box on the printing stock according to the position deflection correction quantity.
2. The digital printing offset correction apparatus according to claim 1, wherein the printing position adjustment mechanism comprises: a motor;
the control end of the motor is connected with the computer, and the output shaft of the motor is connected with the printing box; the motor is used for adjusting the printing position of the printing box on the printing stock under the control of the computer.
3. The digital printing offset correction apparatus according to claim 1, wherein the printing position adjustment mechanism comprises: a printing control chip;
the input end of the printing control chip is connected with the computer, and the output end of the printing control chip is connected with the printing box; the printing control chip is used for receiving the position deflection correction amount of the computer, correcting the preset printing position of the printing box according to the position deflection correction amount to obtain a corrected printing position, and controlling the printing box to print the printing stock according to the corrected printing position.
4. The digital printing offset correction apparatus according to claim 3, wherein the printing position adjustment mechanism further comprises: a print data buffer;
the printing data buffer is arranged between the printing control chip and the computer, and is used for receiving and storing the position deflection correction of the computer and transmitting the position deflection correction to the printing control chip.
5. The digital printing bias correction device of claim 1, wherein the position detection structure is one or both of a photosensor, an encoder.
6. The digital printing bias correction apparatus according to claim 1, wherein the image sensor is one of a digital area camera or a digital line camera.
7. The digital printing deviation correction apparatus according to claim 1, wherein the calculation formula of the amount of correction of the position deflection of the print cassette is xδ＝xN-xPAnd yδ＝yN-yP；
Wherein x isδAnd y δ are respectively the abscissa and ordinate of the position deflection correction amount, xNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yP are the expected position coordinates of the positioning mark, respectively.
8. A digital printing offset correction method, the method comprising:
acquiring the position and the image of a printing stock;
obtaining the current coordinates of the positioning marks on the printing stock by adopting a digital image processing algorithm according to the position and the image of the printing stock;
calculating the position deflection correction quantity of the printing box according to the current coordinates of the positioning marks;
and correcting the printing position of the printing stock according to the position deflection correction.
9. The digital printing bias correction method of claim 8, wherein said digital image processing algorithm comprises: filtering, windowing, sharpening, and template matching.
10. The digital printing offset correction method of claim 8, wherein calculating a position deflection correction amount of the print cartridge based on the current coordinates of the positioning mark comprises:
acquiring the expected position coordinates of the positioning marks according to the typesetting requirements;
according to the current coordinates and the expected position coordinates of the positioning mark, using a formula xδ＝xN-xPAnd yδ＝yN-yPObtaining the position deflection correction quantity of the positioning mark as the position deflection correction quantity of the printing box;
wherein x δ and y δ are respectively the abscissa and ordinate of the position deflection correction amount, xNAnd yNRespectively the current coordinates, x, of the positioning marksPAnd yPRespectively, the expected position coordinates of the positioning markers.
CN202110641968.2A 2021-06-09 2021-06-09 Digital printing deviation correction device and method Pending CN113211981A (en)

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Application publication date: 20210806