CN112269183A - A kind of laser film printing online correction detection device and detection method - Google Patents
A kind of laser film printing online correction detection device and detection method Download PDFInfo
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- CN112269183A CN112269183A CN202011090641.2A CN202011090641A CN112269183A CN 112269183 A CN112269183 A CN 112269183A CN 202011090641 A CN202011090641 A CN 202011090641A CN 112269183 A CN112269183 A CN 112269183A
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000007639 printing Methods 0.000 title claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 108091026890 Coding region Proteins 0.000 claims description 7
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007648 laser printing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
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- 235000013305 food Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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Abstract
本发明公开一种镭射膜印刷在线纠偏检测装置及检测方法，镭射膜印刷在线纠偏检测装置包括包括激光传感器模块、回滞比较器、核心控制器、和设置在镭射膜上裁切衔接区的反射区，激光传感器模块包括激光传感器安装架、激光发射传感器、激光接收传感器、滤光镜、细缝块。本发明能够及时检测到镭射膜印刷过程中出现跑偏的问题，检测效率和检测精度高。
The invention discloses a laser film printing online correction detection device and a detection method. The laser film printing online correction detection device comprises a laser sensor module, a hysteresis comparator, a core controller, and a reflection device arranged in a cutting and connecting area on the laser film. In the area, the laser sensor module includes a laser sensor mounting frame, a laser emitting sensor, a laser receiving sensor, a filter, and a slit block. The invention can detect the deviation problem in the printing process of the laser film in time, and has high detection efficiency and detection accuracy.
Description
Technical Field
The invention relates to the technical field of positioning, in particular to a laser film printing online deviation rectifying detection device and a detection method.
Background
The laser film has smooth surface and changeable color, has the characteristics of anti-counterfeiting, wear resistance, environmental protection and the like, and is widely applied to packages of cigarettes, wines, foods, advertising and the like. In the traditional laser printing process, the processes of laser printing, wet compounding, slitting and the like are required, and phenomena such as belt material deviation, longitudinal tearing, edge abrasion and the like are easy to occur. Especially, when deviation occurs, if deviation cannot be found and corrected in time, waste of the laser film is inevitably caused, product quality is affected, and production efficiency is reduced.
Currently, the most common technology for detecting the deviation of the strip material is to detect the edge, the central line or the single marking line of the strip material by using a photoelectric sensor. However, due to the physical characteristics of the laser film, the surface of the laser film is smooth and the color of the laser film is changeable, so that the laser film has a light reflection phenomenon under the condition of external light interference, the color changes along with the position movement, the interference of detection signals is very large, and the detection effect is insufficient. Meanwhile, the detection signal is qualitatively analyzed, so that quantitative detection cannot be achieved, the detection precision is low, and the corresponding time is long. Machine vision schemes are often complex and detection efficiency is low.
Therefore, the existing deviation detection device and detection scheme must be improved, the detection efficiency and detection precision are improved, the control system is in an allowable error range, the production and processing efficiency is improved, and the rejection rate is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an online deviation rectifying detection device and a detection method for laser film printing.
In order to achieve the purpose, the invention provides the following technical scheme to realize the purpose:
the utility model provides a laser film printing detection device that rectifies on line which characterized in that: the laser sensor module comprises a laser sensor mounting frame, a laser transmitting sensor, a laser receiving sensor, a filter lens and a slit block, wherein the hysteresis comparator is responsible for receiving a laser intensity electric signal sequence number fed back by the laser receiving sensor and carrying out high-speed debouncing treatment, and the core controller is responsible for receiving a debouncing signal of the hysteresis comparator, analyzing a signal sequence and a set coding sequence and determining a deviation direction and a deviation amount;
a first strong reflection strip and a plurality of second strong reflection strips, a third strong reflection strip and a weak reflection strip are arranged in the reflection area, the shape of the reflection area is rectangular, the shape of the first strong reflection strip is rectangular, the first strong reflection strip is arranged along the width direction of the reflection area, the shape of the second strong reflection strip is right trapezoid, the width of the long edge of the second strong reflection strip is the same as that of the reflection area, the width of the short edge is half of that of the reflection area, the shape of the third strong reflection strip is the same as that of the second strong reflection strip, the right-angled waist of the second strong reflection strip is attached to one long edge of the reflection area, the right-angled waist of the third strong reflection strip is attached to the other long edge of the reflection area, the short edges of the second strong reflection strip and the third strong reflection strip are oppositely arranged, the second strong reflection strip and the third strong reflection strip are circularly arranged behind the first strong reflection strip, the minimum distance between the adjacent strong reflection strips is the same, the first strong reflection strip and the second strong reflection strip and the third strong reflection, Weak reflecting strips are arranged at positions outside the second strong reflecting strip and the third strong reflecting strip;
the laser sensor mounting frame is provided with a laser transmitting sensor mounting hole and a laser receiving sensor mounting hole, the laser transmitting sensor is mounted in the laser transmitting sensor mounting hole, the laser receiving sensor is mounted in the laser receiving sensor mounting hole, a slit block mounting groove is formed in the position, below the laser transmitting sensor mounting hole, of the laser sensor mounting frame, a slit block is mounted in the slit block mounting groove, a filter mounting groove is formed in the position, below the laser receiving sensor mounting hole, of the laser sensor mounting frame, and a filter is mounted in the filter mounting groove;
the laser signal that laser emission sensor transmitted sees through the slit on the slit piece and launches to the reflecting region, and the frequency of optical filter and laser emission sensor, laser receiving transducer match ensure that the signal after the light filtering is required laser signal, and laser receiving transducer is responsible for receiving the laser reflection signal after the light filtering mirror to convert the signal of giving the hysteresis comparator of giving of telecommunication output.
The width of the slit on the slit block is less than 0.2 mm.
The width of first strong reflection strip is 0.4mm, and the height of second strong reflection strip, third strong reflection strip is 0.2mm, and the minimum interval between adjacent strong reflection strip is 0.2mm, and the length of reflecting region is 2 mm.
A laser film printing online deviation rectification detection method is implemented by adopting a laser film printing online deviation rectification detection device, and is characterized in that: the method comprises the following steps:
step 1: printing a reflection area in a cutting connection area of the laser film, wherein a first strong reflection strip, a plurality of second strong reflection strips, a plurality of third strong reflection strips and a plurality of weak reflection strips are arranged in the reflection area, the shape of the reflection area is rectangular, the shape of the first strong reflection strip is rectangular, the first strong reflection strip is arranged along the width direction of the reflection area, the shape of the second strong reflection strip is a right trapezoid, the width of the long side of the second strong reflection strip is the same as that of the reflection area, the width of the short side of the second strong reflection strip is half of that of the reflection area, the shape of the third strong reflection strip is the same as that of the second strong reflection strip, the right-angled waist of the second strong reflection strip is attached to one long side of the reflection area, the right-angled waist of the third strong reflection strip is attached to the other long side of the reflection area, the short sides of the second strong reflection strip and the third strong reflection strips are oppositely arranged, the second strong reflection strips and the third strong reflection strips are circularly arranged behind the first strong reflection strips, and the minimum distance, the positions in the reflecting area except the first strong reflecting strip, the second strong reflecting strip and the third strong reflecting strip are provided with weak reflecting strips,
step 2: signals generated when the laser emission sensor is aligned to the middle position of the reflecting area are used as preset coding sequences and input into the core controller;
and step 3: the laser emitting sensor continuously emits laser with specific frequency, the reflecting area moves at a constant speed along with the laser film and passes below the laser sensor module, and the laser is reflected by each reflecting strip in the reflecting area and then received by the laser receiving sensor;
and 4, step 4: the laser signal received by the laser receiving sensor is transmitted to the hysteresis comparator, and the hysteresis comparator is used for carrying out debouncing processing on the signal and then transmitting the processed signal to the core controller;
and 5: the core controller analyzes the feedback signal and compares the feedback signal with a preset specific coding sequence value so as to judge the position of the current laser film and determine the deviation direction and the deviation amount.
In the step 1, the width of the first strong reflection strip is 0.4mm, the heights of the second strong reflection strip and the third strong reflection strip are both 0.2mm, the minimum distance between the adjacent strong reflection strips is 0.2mm, and the length of the reflection area is 2 mm.
Compared with the prior art, the invention has the beneficial effects that: the position of the laser film is detected under the condition of not wasting a printing area by designing and detecting a specific sequence of the reflection area and a reflection strip with a specific shape; the operations of filtering out received signals by adopting a slit block and a hysteresis comparator arranged in front of the laser sensing transmitter, improving the identifiability and the identification accuracy of the coding sequence, ensuring that the detection result is not interfered by normal printed patterns and the running speed, and greatly improving the identification accuracy.
Drawings
FIG. 1 is a schematic structural diagram of an online deviation-rectifying detection device for laser film printing according to the present invention;
FIG. 2 is a cross-sectional view of a laser sensor module of the present invention;
FIG. 3 is a bottom view of a laser sensor mount of the present invention;
FIG. 4 is a schematic view of a laser film according to the present invention;
FIG. 5 is a schematic structural view of a reflection area according to the present invention;
fig. 6 is a schematic diagram illustrating a variation of a laser reflection signal according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below with reference to fig. 1-6.
A laser film printing positioning detection device comprises a laser sensor module 1, a hysteresis comparator 2, a core controller 3 and a reflection area 5 arranged on a cutting connection area 41 on a laser film 4, wherein the cutting connection area 41 is positioned between two effective printing areas 42 on the laser film 4; the laser sensor module 1 comprises a laser sensor mounting frame 11, a laser emitting sensor 12, a laser receiving sensor 13, a filter 14 and a slit block 15, the hysteresis comparator 2 is responsible for receiving a laser intensity electric signal serial number fed back by the laser receiving sensor 13 and carrying out high-speed debouncing treatment, the core controller 3 is responsible for receiving a debouncing signal of the hysteresis comparator 2 and analyzing the difference between a signal sequence and a set coding sequence; a laser emitting sensor mounting hole 111 and a laser receiving sensor mounting hole 112 are formed in the laser sensor mounting frame 11, the laser emitting sensor 12 is mounted in the laser emitting sensor mounting hole 111, the laser receiving sensor 13 is mounted in the laser receiving sensor mounting hole 112, a slit block mounting groove 113 is formed in the laser sensor mounting frame 11 and located below the laser emitting sensor mounting hole 111, a slit block 15 is mounted in the slit block mounting groove 113, a filter mounting groove 114 is formed in the laser sensor mounting frame 11 and located below the laser receiving sensor mounting hole 112, and a filter 14 is mounted in the filter mounting groove 114; laser signals emitted by the laser emitting sensor 12 are transmitted to the reflecting area 5 through the slit on the slit block 15, the frequency of the filter 14 is matched with the laser emitting sensor 12 and the laser receiving sensor 13, it is ensured that the filtered signals are required laser signals, and the laser receiving sensor 13 is responsible for receiving the laser reflection signals after passing through the filter 14, converting the laser reflection signals into electric signals and outputting the electric signals to the hysteresis comparator 2.
A first strong reflection strip 51, a plurality of second strong reflection strips 52, third strong reflection strips 53 and weak reflection strips 54 are arranged in the reflection area 5, the shape of the reflection area 5 is rectangular, the shape of the first strong reflection strip 51 is rectangular, the first strong reflection strip 51 is arranged along the width direction of the reflection area 5, the shape of the second strong reflection strip 52 is right trapezoid, the width of the long side of the second strong reflection strip 52 is the same as that of the reflection area 5, the width of the short side is half of that of the reflection area 5, the shape of the third strong reflection strip 53 is the same as that of the second strong reflection strip 52, the right-angled waist of the second strong reflection strip 52 is attached to one long side of the reflection area 5, the right-angled waist of the third strong reflection strip 53 is attached to the other long side of the reflection area 5, the short sides of the second strong reflection strip 52 and the third strong reflection strip 53 are arranged oppositely, the second strong reflection strip 52 and the third strong reflection strip 53 are circularly arranged behind the first strong reflection strip 51, the minimum spacing between adjacent strong reflection stripes is the same, and a weak reflection stripe 54 is disposed at a position in the reflection region 5 except for the first strong reflection stripe 51, the second strong reflection stripe 52, and the third strong reflection stripe 53.
Preferably, the width of the slot in the slot block 15 is less than 0.2 mm.
Preferably, the width of the first strong reflection stripe 51 is 0.4mm, the height of the second strong reflection stripe 52 and the height of the third strong reflection stripe 53 are both 0.2mm, and the length of the reflection area 5 is 2 mm.
A laser film printing positioning detection method is implemented by adopting a laser film printing online deviation rectification detection device, and comprises the following steps:
step 1: printing a reflection area in a cutting connection area of the laser film, wherein a first strong reflection strip, a plurality of second strong reflection strips, a plurality of third strong reflection strips and a plurality of weak reflection strips are arranged in the reflection area, the shape of the reflection area is rectangular, the shape of the first strong reflection strip is rectangular, the first strong reflection strip is arranged along the width direction of the reflection area, the shape of the second strong reflection strip is a right trapezoid, the width of the long side of the second strong reflection strip is the same as that of the reflection area, the width of the short side of the second strong reflection strip is half of that of the reflection area, the shape of the third strong reflection strip is the same as that of the second strong reflection strip, the right-angled waist of the second strong reflection strip is attached to one long side of the reflection area, the right-angled waist of the third strong reflection strip is attached to the other long side of the reflection area, the short sides of the second strong reflection strip and the third strong reflection strips are oppositely arranged, the second strong reflection strips and the third strong reflection strips are circularly arranged behind the first strong reflection strips, and the minimum distance, the positions in the reflecting area except the first strong reflecting strip, the second strong reflecting strip and the third strong reflecting strip are provided with weak reflecting strips,
step 2: signals generated when the laser emission sensor is aligned to the middle position of the reflecting area are used as preset coding sequences and input into the core controller;
and step 3: the laser emitting sensor continuously emits laser with specific frequency, the reflecting area moves at a constant speed along with the laser film and passes below the laser sensor module, and the laser is reflected by each reflecting strip in the reflecting area and then received by the laser receiving sensor;
and 4, step 4: the laser signal received by the laser receiving sensor is transmitted to the hysteresis comparator, and the hysteresis comparator is used for carrying out debouncing processing on the signal and then transmitting the processed signal to the core controller;
and 5: the core controller analyzes the feedback signal and compares the feedback signal with a preset specific coding sequence value so as to judge the position of the current laser film and determine the deviation direction and the deviation amount.
In the step 1, the width of the first strong reflection strip is 0.4mm, the heights of the second strong reflection strip and the third strong reflection strip are both 0.2mm, the minimum distance between the adjacent strong reflection strips is 0.2mm, and the length of the reflection area is 2 mm.
The laser irradiates on the strong reflection strip, a high-value signal is finally obtained after reflection, and a low-value signal is finally obtained after reflection.
The width of the first strong reflection strip at the forefront side is wider, the duration time of the signal with a high value is long, and the signal is different from the signals generated by the other reflection strips, so that the signal can be used as an initial detection signal.
The obtained signal is compared with a preset value, so that the accurate position of the existing laser light in the reflecting area can be obtained, and the deviation direction and the deviation amount of the isolating film can be calculated.
The laser emission sensor is aligned to the middle of the reflection area, namely when the laser emission sensor is positioned at the position A relative to the reflection area, the obtained signal is used as an initial signal;
after the laser film deviates, the position of the laser emission sensor relative to the reflection area changes, the laser emission sensor reaches the position of B, C, the obtained signal is changed relative to the initial signal emission, and the deviation position and the deviation amount of the laser film can be calculated according to the duration of the high-value signal and the low-value signal and the correlation of the strong reflection strip and the low reflection strip by analyzing the difference between the obtained signal and the initial signal.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. The utility model provides a laser film printing detection device that rectifies on line which characterized in that: the laser sensor module comprises a laser sensor mounting frame, a laser emission sensor, a laser receiving sensor, a filter lens and a slit block, wherein the laser intensity electric signal sequence number fed back by the laser receiving sensor is received by the hysteresis comparator, high-speed debouncing processing is carried out, and the debouncing signal of the hysteresis comparator is received by the core controller, a signal sequence and a set coding sequence are analyzed, so that the deviation direction and the deviation amount are determined;
be equipped with a first strong reflection strip and a plurality of second strong reflection strip, third strong reflection strip, weak reflection strip in the reflection district, the shape in reflection district is the rectangle, the shape of first strong reflection strip is the rectangle, first strong reflection strip sets up along the width direction in reflection district, second strong reflection strip shape is right trapezoid, the width on second strong reflection strip long limit is the same with the reflection district width, the width of minor face is half of reflection district width, the shape of third strong reflection strip is the same with second strong reflection strip shape, one of them long limit of the right angle waist laminating reflection district of second strong reflection strip, another long limit of the right angle waist laminating reflection district of third strong reflection strip, the minor face of second strong reflection strip and third strong reflection strip sets up relatively, second strong reflection strip and third strong reflection strip circulate the setting behind first strong reflection strip, the minimum spacing between the adjacent strong reflection strips is the same, and weak reflection strips are arranged at the positions except for the first strong reflection strip, the second strong reflection strip and the third strong reflection strip in the reflection region;
the laser sensor mounting frame is provided with a laser transmitting sensor mounting hole and a laser receiving sensor mounting hole, the laser transmitting sensor is mounted in the laser transmitting sensor mounting hole, the laser receiving sensor is mounted in the laser receiving sensor mounting hole, a slit block mounting groove is formed in the position, below the laser transmitting sensor mounting hole, of the laser sensor mounting frame, a slit block is mounted in the slit block mounting groove, a filter lens mounting groove is formed in the position, below the laser receiving sensor mounting hole, of the laser sensor mounting frame, and a filter lens is mounted in the filter lens mounting groove;
the laser signal that laser emission sensor transmitted sees through on the slot transmission reflection area on the slot piece, the frequency and the laser emission sensor of filter lens, laser receiving sensor phase-match ensure that the signal after the filtering is required laser signal, laser receiving sensor is responsible for receiving the laser reflection signal behind the filter mirror to convert the signal output of giving the hysteresis comparator of giving of telecommunication into.
2. The laser film printing online deviation rectifying detection device according to claim 1, characterized in that: the width of the slit on the slit block is less than 0.2 mm.
3. The laser film printing online deviation rectifying detection device according to claim 1, characterized in that: the width of first strong reflection strip is 0.4mm, and the height of second strong reflection strip, third strong reflection strip is 0.2mm, and the minimum interval between the adjacent strong reflection strip is 0.2mm, and the length of reflecting region is 2 mm.
4. A laser film printing online deviation rectification detection method is characterized by comprising the following steps: the method comprises the following steps:
step 1: printing a reflection area in a cutting connection area of the laser film, wherein a first strong reflection strip, a plurality of second strong reflection strips, a plurality of third strong reflection strips and a plurality of weak reflection strips are arranged in the reflection area, the shape of the reflection area is rectangular, the shape of the first strong reflection strip is rectangular, the first strong reflection strip is arranged along the width direction of the reflection area, the shape of the second strong reflection strip is a right trapezoid, the width of the long side of the second strong reflection strip is the same as that of the reflection area, the width of the short side of the second strong reflection strip is half of that of the reflection area, the shape of the third strong reflection strip is the same as that of the second strong reflection strip, the right-angled waist of the second strong reflection strip is attached to one long side of the reflection area, the right-angled waist of the third strong reflection strip is attached to the other long side of the reflection area, the short sides of the second strong reflection strip and the third strong reflection strips are oppositely arranged, the second strong reflection strips and the third strong reflection strips are circularly arranged behind the first strong reflection strips, and the minimum distance, the positions in the reflecting area except the first strong reflecting strip, the second strong reflecting strip and the third strong reflecting strip are provided with weak reflecting strips,
step 2: signals generated when the laser emission sensor is aligned to the middle position of the reflecting area are used as preset coding sequences and input into the core controller;
and step 3: the laser emitting sensor continuously emits laser with specific frequency, the reflecting area moves at a constant speed along with the laser film and passes below the laser sensor module, and the laser is reflected by each reflecting strip in the reflecting area and then received by the laser receiving sensor;
and 4, step 4: the laser signal received by the laser receiving sensor is transmitted to the hysteresis comparator, and the hysteresis comparator is used for carrying out debouncing processing on the signal and then transmitting the processed signal to the core controller;
and 5: the core controller analyzes the feedback signal and compares the feedback signal with a preset specific coding sequence value so as to judge the position of the current laser film and determine the deviation direction and the deviation amount.
5. The laser film printing online deviation rectifying detection method according to claim 4, characterized in that: in the step 1, the width of the first strong reflection strip is 0.4mm, the heights of the second strong reflection strip and the third strong reflection strip are both 0.2mm, the minimum distance between the adjacent strong reflection strips is 0.2mm, and the length of the reflection area is 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011090641.2A CN112269183A (en) | 2020-10-13 | 2020-10-13 | A kind of laser film printing online correction detection device and detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011090641.2A CN112269183A (en) | 2020-10-13 | 2020-10-13 | A kind of laser film printing online correction detection device and detection method |
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| CN112269183A true CN112269183A (en) | 2021-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119583A (en) * | 2021-04-19 | 2021-07-16 | 深圳市联祥印刷有限公司 | Printing device convenient to calibrate and calibration method thereof |
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2020
- 2020-10-13 CN CN202011090641.2A patent/CN112269183A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119583A (en) * | 2021-04-19 | 2021-07-16 | 深圳市联祥印刷有限公司 | Printing device convenient to calibrate and calibration method thereof |
| CN113119583B (en) * | 2021-04-19 | 2022-07-29 | 深圳市联祥印刷有限公司 | Printing device convenient to calibrate and calibration method thereof |
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