WO2020259088A1

WO2020259088A1 - Digital printing press, detection device and method for front-side and back-side printing contents used for digital printing press

Info

Publication number: WO2020259088A1
Application number: PCT/CN2020/089035
Authority: WO
Inventors: 曲海东; 李继洲; 曾磊乐; 张建强
Original assignee: 深圳弘博智能数码设备有限公司
Priority date: 2019-06-25
Filing date: 2020-05-07
Publication date: 2020-12-30
Also published as: CN110202961A

Abstract

A digital printing press, and a detection device and method for front-side and back-side printing contents used for a digital printing press. The detection method for front-side and back-side printing contentscomprises : a pair of corresponding identification codes are assignedtoa template for front-side and back-side printing contents of each page; the identification codes are printed on the front side and the back side of each page, and the identification codes sensed by a front-side sensor (11) and a back-side sensor (12) are transmitted to a processor; the sensed identification codesare processed by the processor so as to judge whether they are corresponding to each other; if yes, the printing is continued, if not, the printing is stopped and an alarm is given. In this method, a pair of corresponding identification codes are assigned to a template for front-side and back-side printing contents of each page, and the identification codes on the front side and the back side of each page are detected and identified and are analyzed, compared and judged by a processor, thereby preventing the incorrect cohesion of front-side and back-side printing contents and the abandonment of a batch of printed bookscaused by content disorder during bookbinding.

Description

Digital printing machine, device and method for detecting front and back printing content of digital printing machine

Cross reference of related applications

This application requires that it be submitted to the Chinese Patent Office on June 25, 2019. The application number is 201910553479.4 and the invention title is "a digital printing machine, a device and method for detecting printed content on the front and back of a digital printing machine". Priority, the entire content of which is incorporated in this application by reference.

Technical field

This application belongs to the field of digital printing technology, and in particular relates to a digital printing machine, a device and method for detecting the front and back printing content of the digital printing machine.

Background technique

Digital printing machine, also known as universal flatbed printer or flatbed printer, breaks through the bottleneck of digital printing technology, and realizes the real one-sheet printing, no plate making, and full-color image completion at one time. It is a replacement product of traditional printing machine, which prints on both sides The high efficiency above is unmatched by traditional printing presses.

However, when the existing digital printing presses print and read books and periodicals, the content on the front and back sides of a single sheet of paper is controlled by software. During the printing process, if there are human or software reasons, the single sheet of paper If the content of the front and back of the book does not match, the overall content will be disordered in the cost of binding, which will cause the entire batch of printed books to be scrapped; however, the current inspection methods for the front and back contents can only be manually inspected. This inspection method Inefficiency seriously affects the efficiency of batch printing and greatly reduces the production efficiency of printing companies.

Summary of the invention

The embodiment of the present application provides a method for detecting the front and back printing content of a digital printing machine, which aims to solve the problem of the mismatch of the front and back printing content when the printed matter is printed on both sides.

The present application is realized in this way, providing a front and back printing content detection device for a digital printer. The front and back printing content detection device includes: a fixed beam assembly, a front sensor installed on the fixed beam assembly, and A back sensor and a processor communicatively connected with the front sensor and the back sensor; the front sensor and the back sensor form a passage for the printed matter to pass through.

Furthermore, the device for detecting printed content on the front and back side further includes:

A front sensor probe arranged on the paper feeding side of the front sensor;

A back sensor probe arranged on the paper feeding side of the back sensor;

After the front sensor probe senses the printed matter, turn on the front sensor;

After the back sensor probe senses the printed matter, the back sensor is turned on.

Furthermore, the front sensor and the back sensor are both high-definition cameras.

Furthermore, the front sensor and the back sensor are all connected to the processor through optical fiber data cables.

Furthermore, the fixed beam assembly includes:

The first fixed beam and the second fixed beam;

A first fixing block that is slidably arranged on the first fixing beam, and the front sensor is installed on the first fixing block;

A second fixing block provided on the second fixing beam is slidably mounted, and the back sensor is installed on the second fixing block.

Furthermore, the fixed beam assembly further includes:

The first slide rail and the second slide rail;

A first adjustment handle arranged at the end of the first fixed beam and a second adjustment handle arranged at the end of the second fixed beam;

The first fixed beam is slidably connected with the first slide rail;

The second fixed beam is slidably connected with the second slide rail.

An embodiment of the present application also provides a digital printer, which includes a frame, a jet printing unit assembled in the frame, and the above-mentioned front and back printing content detection device for the digital printer. The rack includes a host front wall panel and a host rear wall panel, and the fixed beam assembly is erected between the host front wall panel and the host rear wall panel.

The embodiment of the present application also provides a method for detecting the printed content on the front and back of the digital printer described above. The method for detecting printed content on the front and back includes:

Start the digital printer and assign a set of corresponding identification codes on the printed content template on the front and back of each page;

Start printing. After the front and back of each page of printed matter are printed, a set of corresponding identification codes printed on the front and back of the printed matter pass through the front sensor and the back sensor;

The front sensor transmits the identification code sensed on the front to the processor, and the back sensor transfers the identification code sensed on the back to the processor;

The processor analyzes the identification code sensed on the front side and the identification code sensed on the back side to determine whether they correspond;

Yes, continue printing, no, pause printing and call the police.

Furthermore, the activation of the digital printer and assigning a set of corresponding identification codes to the printed content template on the front and back of each page is specifically as follows:

Start the digital printing press;

Enter the content template to be printed;

Assign a set of corresponding identification codes on the printed content template on the front and back of each page.

Furthermore, the first fixed beam and the second fixed beam are both provided with scales, and the starting of the digital printer, before assigning a set of corresponding identification codes on the printed content template on the front and back of each page, further includes:

Adjust the front sensor and the back sensor to a predetermined position according to the scales on the first fixed beam and the second fixed beam.

In the embodiment of this application, a set of corresponding identification codes is assigned to the printed content template on the front and back of each page, and then the front and back sensors are used to detect and identify the identification codes on the front and back of the printed matter, and the processor analyzes and compares Judgment, so as to prevent the front and back content of the printed matter from being unable to connect correctly, and there will be no confusion in the contents of the books and periodicals at the time of binding cost, which will cause the entire batch of printed books and periodicals to be scrapped.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements in the drawings with the same reference numerals are identified as similar elements. Unless there is a special statement, the drawings in the drawings do not constitute a limitation of scale.

FIG. 1 is a perspective view of the detection device for front and back printed content provided by an embodiment of the present application;

2 is a partial exploded schematic diagram of the detection device for front and back printed content provided by an embodiment of the present application;

FIG. 3 is a front view of the detection device for front and back printed content provided by an embodiment of the present application;

4 is a cross-sectional view of the detection device for front and back printed content provided by an embodiment of the present application;

Fig. 5 is an enlarged schematic diagram of part A in Fig. 4 of the embodiment of the present application;

Fig. 6 is a perspective view of a first fixed beam in an embodiment of the present application;

FIG. 7 is a perspective view of a second fixed beam according to an embodiment of the present application;

8 is another partial cross-sectional view of the detection device for front and back printed content provided by an embodiment of the present application;

9 is a flowchart of an embodiment of a method for detecting front and back printing content provided by an embodiment of the application;

10 is a flowchart of another embodiment of a method for detecting front and back printing content provided by an embodiment of the application;

FIG. 11 is a flowchart of steps of another embodiment of a method for detecting front and back printing content provided by an embodiment of the application.

Detailed ways

In order to make the purpose, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application.

Hereinafter, taking FIGS. 1 to 8 as an example, an optional embodiment of a device for detecting the front and back printing content of a digital printer provided by the embodiment of the present application is described in detail. The printed matter is paper, roll carrier (cloth roll), etc.

Example one

The embodiment of the present application provides a front and back printing content detection device for a digital printer. The front and back printing content detection device includes: a fixed beam assembly, a front sensor 11 mounted on the fixed beam assembly, and a back sensor The sensor 12, and a processor (not shown in the figure) communicatively connected with the front sensor 11 and the back sensor 12; between the front sensor 11 and the back sensor 12 is formed for printing objects to pass through Channel. Specifically, a gap of a predetermined distance is reserved between the front sensor 11 and the back sensor 12 to form a passage for the printed matter to pass through. The front sensor 11 faces the front of the printed matter, and the back sensor 12 faces the printed matter. The back of the object; the fixed beam assembly can be installed on a digital printer or on an independent bracket.

Both the front sensor 11 and the back sensor 12 can use high-definition cameras to increase the clarity of shooting the front and back content of the printed matter, thereby improving the accuracy of detecting the front and back content on the printed matter; the front sensor The sensor 11 and the back sensor 12 can also be other code scanners that can recognize two-dimensional codes or bar codes.

In the embodiment of the present application, a front sensor 11 and a back sensor 12 that are communicatively connected with the processor are provided on the fixed beam assembly, and the front sensor 11 and the back sensor 12 are used to detect and recognize the identification codes on the front and back of the printed matter. , The processor analyzes and compares and judges, so as to prevent the front and back content of the printed matter from being unable to connect correctly, and there will be no confusion in the contents of the books and periodicals at the time of binding cost, which will cause the entire batch of printed books and periodicals to be scrapped.

Example two

In an optional embodiment of the present application, the front and back printing content detection device further includes a front sensing probe 13 arranged on the paper feeding side of the front sensor 11 and a paper feeding sensor 13 arranged on the back sensor 12 The back sensor probe 14 on the side; the front sensor probe 13 and the back sensor probe 14 are used to sense the printed matter. After the front sensor probe 13 senses the printed matter, the front sensor 11 is turned on; the back sensor After the probe 14 senses the printed matter, the back sensor 12 is turned on.

Specifically, when the printed matter enters the front and back printing content detection device for the digital printer, the front sensing probe 13 will transmit a signal to the processor after sensing the printed matter, and the The processor controls the front sensor 11 to detect the front identification code of the printed matter; similarly, the back sensor probe 14 will transmit the signal to the processor after sensing the printed matter, which will be processed by the processor. The device controls the back sensor 12 to detect the back identification code of the printed matter. The front sensing probe 13 and the back sensing probe 14 can be infrared sensing probes or other sensing probes.

Example three

In an optional embodiment of the present application, the front sensor 11 and the back sensor 12 are all connected to the processor through an optical fiber data cable 5; thereby speeding up the front sensor 11, the The data interaction between the back sensor 12 and the processor ensures the stability of data transmission between the front sensor 11, the back sensor 12, and the processor, thereby improving detection efficiency. The communication connection between the front sensor 11 and the back sensor 12 and the processor can also use copper cables, such as Cat 5e network cable, Cat 6 network cable, etc., or wireless transmission, such as Wi-Fi, ZigBee, NFC, Bluetooth, etc.

Example four

In an optional embodiment of the present application, the fixed beam assembly includes: a first fixed beam 21 and a second fixed beam 22; a first fixed block 23 slidably arranged on the first fixed beam 21, the front face The sensor 11 is mounted on the first fixing block 23; the second fixing block 24 is slidably arranged on the second fixing beam 22, and the back sensor 12 is mounted on the second fixing block 24. Specifically, the first fixed beam 21 is located above the passage through which the printed matter passes, and the second fixed beam 22 is located below the passage through which the printed matter passes. Both the first fixing block 23 and the second fixing block 24 can be slid to adjust the positions of the front sensor 11 and the back sensor 12 so that the front sensor 11 and the back sensor 12 correspond to the identification code printed on the back of the printed matter , To adapt to different sizes of prints or prints with different identification code positions.

Furthermore, the surface of the first fixed beam 21 is provided with scales along its length direction, and the surface of the second fixed beam 22 is provided with scales along its length direction. By setting the scale, the user can digitize the position of the front sensor 11 and the back sensor 12 when adjusting the position, which is convenient for recording, and the position adjustment is more precise.

Furthermore, the fixed beam assembly includes: a first locking member 25 that locks the first fixed block 23 at any position on the first fixed beam 21, and a first locking member 25 that locks the second fixed block 24 on the The second locking member 26 at any position on the second fixed beam 22. The first locking member 25 and the second locking member 26 can select adjusting bolts. By setting the first locking member 25 and the second locking member 26, the adjusted position of the front sensor 11 and the back sensor 12 are fixed, so as to prevent the position of the front sensor 11 and the back sensor 12 from being accidentally touched or shaken deviation.

Example five

In an optional embodiment of the present application, the fixed beam assembly further includes: a first slide rail 27 and a second slide rail 28; a first adjustment handle 29 arranged at the end of the first fixed beam 21 and The second adjusting handle 31 at the end of the second fixed beam 22. The first fixed beam 21 is slidably connected to the first slide rail 27; the second fixed beam 22 is slidably connected to the second slide rail 28.

In this application, the first adjustment handle 29 and the second adjustment handle 31 may be ordinary handles for adjusting the positions of the first fixed beam 21 and the second fixed beam 22.

However, in order to adjust the positions of the first fixed beam 21 and the second fixed beam 22 more accurately, in another optional embodiment of the present application, the first adjustment handle 29 and the second adjustment handle 31 are selected as fine adjustment knobs.

The first slide rail 27 and the second slide rail 28 can be directly or indirectly mounted on the rear wall 42 of the main body of the digital printing press.

Furthermore, the fixed beam assembly further includes a first bracket 32 and a second bracket 33, the first slide rail 27 is installed on the first bracket 32, and the second slide rail 28 is installed on the first bracket 32. The second bracket 33; the first fixed beam 21 and the second fixed beam 22 are hollow tubes, the first fixed beam 21 is sleeved on the first slide rail 27, the second fixed The beam 22 is sleeved on the second slide rail 28; the base 291 of the first adjustment handle is fixedly connected to the first fixed beam 21, and the adjustment screw 292 of the first adjustment handle is connected to the first The sliding rail 27 is screwed; the base 311 of the second adjusting handle is fixedly connected to the second fixed beam 22, and the adjusting screw 312 of the second adjusting handle is screwed to the second sliding rail 28. The end of the first slide rail 27 is provided with a first threaded hole, the end of the second slide rail 28 is provided with a second threaded hole, and the first fixing beam 21 is provided with a first bracket 32 and a first The first avoidance groove 211 at the connection of the sliding rail 27, the second fixed beam 22 is provided with a second avoidance groove 221 for avoiding the connection between the second bracket 33 and the second sliding rail 28, the first avoidance groove 211 Both the second avoiding slot 221 and the second avoiding slot 221 are long slot types. The first slide rail 27 is installed on the first bracket 32, and the first slide rail 27 is fixed. By rotating the knob 293 of the first adjustment handle, the adjustment screw 292 of the first adjustment handle is driven to rotate, thereby making the first adjustment handle 29 Relative displacement occurs with respect to the first slide rail 27, thereby driving the first fixed beam 21 fixedly connected to the base 291 of the first adjustment handle to move, so as to realize the precise adjustment of the position of the first fixed beam 21. When the front sensor needs to be adjusted At the position of 11, just turn the knob 293 of the first adjustment handle to move the first fixed beam 21 to adjust the position of the front sensor 11. When the position of the front sensor 11 is adjusted, turn the first adjustment The adjusting screw locking member 294 of the handle locks the adjusting screw 292 of the first adjusting handle, thereby locking the position of the front sensor 11. The second slide rail 28 is installed on the second bracket 33, and the second slide rail 28 is fixed. By rotating the knob 313 of the second adjusting handle, the adjusting screw 312 of the second adjusting handle is driven to rotate, thereby making the second adjusting handle 31 Relative displacement occurs with respect to the second slide rail 28, thereby driving the second fixed beam 22 fixedly connected to the base 311 of the second adjusting handle to move, so as to realize the precise adjustment of the position of the second fixed beam 22. When it is necessary to adjust the back sensor At the position of 12, just turn the knob 313 of the second adjustment handle to move the second fixed beam 22 to adjust the position of the back sensor 12. When the position of the back sensor 12 is adjusted, turn the second adjustment The adjusting screw locking member 314 of the handle locks the adjusting screw 312 of the second adjusting handle, thereby locking the position of the back sensor 12.

Example Six

The embodiment of the present application also provides a digital printer, the printer includes a frame, a jet printing unit assembled in the frame, and the above-mentioned front and back printing content detection device for the digital printer, so The rack includes a host front wall panel 41 and a host rear wall panel 42. The fixed beam assembly is erected between the host front wall panel 41 and the host rear wall panel 42; the rack is used to support the host In a digital printer, the inkjet printing unit is used to print relevant content on a printed matter; specifically, after the printed matter passes through the inkjet printing unit, the post-printing unit will print a preset on the printed matter The content on the printed matter is detected by the printed content detection device for the front and back of the digital printer, thereby improving the accuracy of printing.

Example Seven

As shown in FIG. 9, an embodiment of the present application also provides a method for detecting printed content on the front and back of the digital printer described above, and the method includes:

Start the digital printer, and the controller assigns a set of corresponding identification codes to the printed content template on the front and back of each page. The identification code is a two-dimensional code or a barcode. Furthermore, the identification code can be set on each page. The surrounding area of the text content in the printed content template on the front and back is convenient for subsequent cutting and binding into books and periodicals. The relative position relationship between the identification code on the front of each page and the identification code on the back of each page is not limited, and it can be set directly. , It can also be set in dislocation;

Start printing. After printing on the front and back of each page of printed matter is completed, a set of corresponding identification codes printed on the front and back of the printed matter passes through the front sensor and the back sensor, and the printed matter is pushed by the paper feed roller 6 Reach the front and back printing content detection device for the digital printer, when the front sensor probe 13 and the back sensor probe 14 sense the printed matter, the front sensor probe 13 and the back sensor probe 14 The sensing signal is transmitted to the processor, and the processor controls the front sensor 11 and the back sensor 12 to turn on, and photographs the front and back content of the printed matter;

The front sensor 11 transmits the identification code data sensed on the front to the processor, and the back sensor 12 transmits the identification code data sensed on the back to the processor;

Yes, that is, if the content on the front and back of the printed matter is the content to be printed on the same printed matter, the printing will continue. No, that is, the content on the front and back of the printed matter is not the content to be printed on the same printed matter, then the printing will be suspended and Call the police.

In this application, a set of corresponding identification codes is assigned to the printed content template on the front and back of each page, and then the front and back sensors are used to detect and identify the identification codes on the front and back of the printed matter. The processor analyzes and compares the identification codes. This prevents the front and back contents of the printed matter from being unable to connect correctly, and there will be no confusion in the contents of the books and periodicals at the time of binding cost, which will cause the entire batch of printed books and periodicals to be scrapped.

Example eight

As shown in Figure 10, in an optional embodiment of the present application, the activation of the digital printer and assigning a set of corresponding identification codes to the printed content template on the front and back of each page is specifically:

Start the digital printing press;

Enter the content template to be printed;

Assign a set of corresponding identification codes to the printed content template on the front and back of each page; through a set of corresponding identification codes, it is convenient to detect whether the content on the front and back corresponds to the same printed matter. If the same sheet is printed If the identification code on the front and back of the object does not correspond, it means that the content printed on the same printed object does not correspond, thus facilitating the detection by the processor.

Example 9

As shown in FIG. 11, in an optional embodiment of the present application, the first fixed beam 21 and the second fixed beam 22 are both provided with scales, and the digital printer is activated on the front and back of each page. Before assigning a set of corresponding identification codes on the printed content template, it also includes:

According to the scales on the first fixed beam 21 and the second fixed beam 22, adjust the front sensor 11 and the back sensor 12 to a predetermined position so that the identification code printed on the front of the printed matter passes through the front sensor At 11 o'clock, the front sensor 11 corresponds to the identification code printed on the front of the printed matter. When the identification code printed on the back of the printed matter passes through the back sensor 12, the back sensor 12 is the same as the identification code printed on the printed matter. The identification code on the back corresponds to the predetermined position, and the predetermined position changes with the position of the identification code printed on the front and back of the printed matter. When the printed matter moves in the direction of the solid direction, adjust the horizontal position of the front sensor 11 and the back sensor 12 before assigning a set of corresponding identification codes on the printed content template on the front and back of each page, so that the The lateral position of the front sensor 11 is the same as the lateral position of the identification code printed on the front of the printed matter, so that the lateral position of the back sensor 12 is the same as the lateral position of the identification code printed on the back of the printed matter; After the good content reaches the front and back printed content detection device, the identification code on the front and back of the printed matter corresponds to the front sensor 11 and the back sensor 12, thereby improving detection efficiency and detection accuracy. Since the relative positional relationship between the identification code on the front of each page and the identification code on the back of each page is not limited, it can be set up directly or in a staggered setting. Therefore, the relative positional relationship between the front sensor 11 and the back sensor 12 is not limited, either It can be set up right, or it can be set up in a staggered position, depending on the position of the identification code on the front of each page and the identification code on the back of each page.

The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

Through the description of the above implementation manners, a person of ordinary skill in the art can clearly understand that each implementation manner can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. A person of ordinary skill in the art can understand that all or part of the processes in the method of the foregoing embodiments can be implemented by instructing relevant hardware through a computer program. The program can be stored in a computer readable storage medium. When executed, it may include the processes of the above-mentioned method embodiments. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM), etc.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; under the idea of this application, the above embodiments or the technical features in different embodiments can also be combined. The steps can be implemented in any order, and there are many other variations in different aspects of the application as described above. For the sake of brevity, they are not provided in the details; although the application has been described in detail with reference to the foregoing embodiments, the ordinary The technical personnel should understand that: they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the implementations of this application Examples of the scope of technical solutions.

Claims

A front and back printing content detection device for a digital printer, characterized in that the front and back printing content detection device includes: a fixed beam assembly, a front sensor and a back sensor installed on the fixed beam assembly, And a processor communicatively connected with the front sensor and the back sensor; a passage for printing objects to pass is formed between the front sensor and the back sensor.
5. The front and back printing content detection device for a digital printer according to claim 1, wherein the front and back printing content detection device further comprises:

A front sensor probe arranged on the paper feeding side of the front sensor;

A back sensor probe arranged on the paper feeding side of the back sensor;

After the front sensor probe senses the printed matter, turn on the front sensor;

After the back sensor probe senses the printed matter, the back sensor is turned on.
The device for detecting front and back printing content for a digital printer according to claim 1, wherein the front sensor and the back sensor are both high-definition cameras.
2. The front and back printing content detection device for a digital printer according to claim 1, wherein the front sensor and the back sensor are all connected to the processor through an optical fiber data cable.
The device for detecting printed content on the front and back of a digital printer according to any one of claims 1 to 4, wherein the fixed beam assembly comprises:

The first fixed beam and the second fixed beam;

A first fixing block that is slidably arranged on the first fixing beam, and the front sensor is installed on the first fixing block;

A second fixing block provided on the second fixing beam is slidably mounted, and the back sensor is installed on the second fixing block.
5. The device for detecting printed content on the front and back of a digital printer according to claim 5, wherein the fixed beam assembly further comprises:

The first slide rail and the second slide rail;

A first adjustment handle arranged at the end of the first fixed beam and a second adjustment handle arranged at the end of the second fixed beam;

The first fixed beam is slidably connected with the first slide rail;

The second fixed beam is slidably connected with the second slide rail.
A digital printing machine, characterized in that, the digital printing machine comprises a frame, a jet printing unit assembled in the frame, and the front and back sides of the digital printing machine according to any one of claims 1 to 6 In a printing content detection device, the frame includes a front wall panel of the host and a rear wall panel of the host, and the fixed beam assembly is erected between the front wall panel of the host and the rear wall panel of the host.
A method for detecting printed content on the front and back of a digital printer according to claim 7, wherein the method for detecting printed content on the front and back includes:

Start the digital printer and assign a set of corresponding identification codes on the printed content template on the front and back of each page;

Start printing. After the front and back of each page of printed matter are printed, a set of corresponding identification codes printed on the front and back of the printed matter pass through the front sensor and the back sensor;

The front sensor transmits the identification code sensed on the front to the processor, and the back sensor transfers the identification code sensed on the back to the processor;

The processor analyzes the identification code sensed on the front side and the identification code sensed on the back side to determine whether they correspond;

Yes, continue printing, no, pause printing and call the police.
8. The method for detecting printed content on the front and back of claim 8, wherein the activation of the digital printer to assign a set of corresponding identification codes to the printed content template on the front and back of each page is specifically:

Start the digital printing press;

Enter the content template to be printed;

Assign a set of corresponding identification codes on the printed content template on the front and back of each page.
The method for detecting printed content on the front and back of a digital printer according to claim 8 or 9, wherein the first fixed beam and the second fixed beam are both provided with scales, and the start of the digital printing machine, Before assigning a set of corresponding identification codes on the printed content template on the front and back of each page, it also includes:

Adjust the front sensor and the back sensor to a predetermined position according to the scales on the first fixed beam and the second fixed beam.