Printing machine

Abstract

The invention discloses a printing machine, which comprises an unwinding part, which comprises a first winding shaft which is rotatably arranged and is wound with paper to be printed; the winding part comprises a second winding shaft which is rotatably arranged to wind the printed paper; the printing part is located between the unwinding part and the winding part on the movement path of the paper and is configured to print patterns on the paper passing through the printing part; the stopping system comprises a stopping device located on the upstream of the printing part on the movement path of the paper, and the stopping device is configured to prevent the paper from continuously moving towards the winding part; the brake system comprises a brake device for braking the first reel or the second reel; the detection system is configured to detect whether the paper is broken or not; and the control system is in signal connection with the stopping system, the braking system and the detection system and is configured to control the stopping device to prevent the paper from moving and control the braking system to brake the first reel and / or the second reel after the paper is broken.

Description

Technical Field

[0001] The invention relates to the technical field of printing, and in particular to a printing press. Background Art

[0002] In the printing industry, when paper is printed on a high-speed printing press, the paper may break due to paper quality, machine vibration or improper operation of personnel. Especially in the production of tipping paper, lining paper, and printing processing industries, paper is more prone to paper breaks due to its low gram weight and thin paper quality. Once the paper breaks, it not only affects the printing quality, but also may cause machine damage and production interruption. Taking a domestic seven-color printing machine as an example, the distance between each color group (calculated based on the distance between the color group bases) is about 1.7 meters, the paper threading path is about 130 meters long, and the equipment length is about 24 meters. Before printing production, 3 people perform paper threading operations. It takes about 1-2 hours from the unwinding department to the rewinding department, and it takes about 10-20 minutes to thread a single color group. If a paper break occurs during the production process, due to the high operating speed and large inertia of the printing press, it will take 6-8 seconds for the equipment to stop completely after the emergency stop button is pressed, and the broken paper will be pulled toward the rewinding part due to inertia. The unwinding part continues to feed paper, and the paper may be brought into the ink tank during the equipment stop process, and the ink may be brought into other parts of the equipment such as the oven, or wrapped around rollers such as the printing plate roller. Extra time is required to clean the equipment, deal with the part of the original paper on the surface of the rewinding and unwinding rolls that have deviated, and re-thread the paper. The time spent will be much longer than the normal time for paper threading, and the time cost increases sharply invisibly. At the same time, during the printing process, the temperature and humidity of the base paper remain relatively stable. After the machine is shut down to deal with a paper break, the temperature and humidity need to be re-controlled during production, and the continuity of production and the stability of product quality cannot be maintained, increasing the risk of product quality control. During shutdown, since the printing equipment needs to be connected to RTO and other waste gas treatment equipment, the collected VOCs concentration is insufficient after the paper break, and additional natural gas consumption needs to be increased. Therefore, when a paper break occurs, the wasted time, output and other production costs are relatively large.

[0003] At present, there is a lack of targeted remedial measures for paper breaks in the market, especially there is no way to prevent the paper from slipping due to inertia after the equipment breaks, causing the paper to be rolled into the ink tank, wrapped around the printing plate roller, etc. Summary of the invention

[0004] The present invention aims to provide a printing press to improve the problem in the prior art that after paper breaks, it is easy to be rolled into the downstream ink tank or wrapped around the printing plate roller, resulting in a complicated recovery process.

[0005] According to one aspect of an embodiment of the present invention, the present invention provides a printing press, the printing press comprising:

[0006] The unwinding section comprises a first reel rotatably arranged and wound with the paper to be printed;

[0007] A reeling section, comprising a second reel rotatably arranged to reel in the printed paper;

[0008] A printing section, located between the unwinding section and the rewinding section on the moving path of the paper, and configured to print a pattern on the paper passing therethrough;

[0009] A stop system, including a stop device located upstream of the printing section on a moving path of the paper, the stop device being configured to prevent the paper from continuing to move toward the reeling section;

[0010] a brake system, comprising a brake device for braking the first reel or the second reel;

[0011] A detection system configured to detect whether the paper is broken;

[0012] The control system is connected to the stop system, the brake system and the detection system respectively by signals, and is configured to control the stop device to prevent the paper from moving and control the brake system to brake the first reel and / or the second reel after the paper breaks.

[0013] In some embodiments, the brake system includes two brake devices, and the two brake devices are respectively configured to brake the first reel and the second reel.

[0014] In some embodiments, the stopping device comprises:

[0015] two bases, spaced apart; and

[0016] A stop roller, with two ends respectively mounted on two bases and configured to move relative to the base in a direction perpendicular to the axial direction of the stop roller, so as to switch between a first position for pressing the paper to prevent the paper from moving and a position for releasing the paper;

[0017] The driving component is configured to drive the stop roller to move relative to the base.

[0018] In some embodiments, the drive component includes a cylinder.

[0019] In some embodiments, a slideway is provided on the base, and the stopping device further comprises a slider movably provided on the slideway, and the stopping roller is mounted on the slider.

[0020] In some embodiments, the printing unit includes a printing unit body and a guide roller for guiding the paper toward the printing unit body. The stop roller and the guide roller are arranged side by side and can move relative to the guide roller to switch between a first position and a second position. The stop roller in the first position presses the paper against the guide roller, and the stop roller in the second position is arranged with an interval.

[0021] In some embodiments, the brake device includes a brake pad drivingly connected to the first reel or the second reel and a brake for friction braking with the brake pad.

[0022] In some embodiments, the control system includes a first controller connected to the detection system signal, the printing press also includes an emergency stop system connected to the first controller signal, the unwinding section also includes a first motor driving the first reel; the rewinding section also includes a second motor driving the second reel, and the emergency stop system is signal-connected to the first motor and the second motor respectively to shut down the first motor and the second motor based on the emergency stop signal of the first controller after the paper breaks.

[0023] In some embodiments, the control system also includes a second controller connected to the emergency stop system signal, and the second controller is signal-connected to the stop system and the brake system respectively, so as to control the stop device to prevent the movement of paper based on the emergency stop signal of the first controller and control the brake system to brake the first reel and / or the second reel.

[0024] In some embodiments, the detection system includes a photoelectric sensor arranged opposite to the paper and emitting a light beam. The photoelectric sensor determines whether the paper is detected based on the paper's obstruction or reflection of the light beam. The control system determines that the paper is broken based on the photoelectric sensor not detecting the paper.

[0025] In some embodiments, the detection system includes multiple photoelectric sensors arranged along the path of the paper, and the control system is signal-connected to the multiple photoelectric sensors respectively and is configured to determine that the paper is broken when any photoelectric sensor fails to detect the paper.

[0026] In some embodiments, the photoelectric sensor includes an infrared sensor.

[0027] By applying the technical solution of the present invention, after the paper breaks, the control system can emergency brake the unwinding part and the rewinding part and press the paper to prevent the paper from moving forward, which is helpful to improve the problem in the prior art that after the paper breaks, it is easy to be rolled into the downstream ink groove or wrapped around the printing plate roller, resulting in a complicated recovery process.

[0028] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic structural diagram of a printing press according to an embodiment of the present invention is shown;

[0031] Figure 2 A schematic structural diagram of a stopping system of a printing press according to an embodiment of the present invention is shown;

[0032] Figure 3 A schematic structural diagram of a brake system of a printing press according to an embodiment of the present invention is shown;

[0033] Figure 4 A block diagram showing a control system of a printing press according to an embodiment of the present invention.

[0034] In the figure:

[0035] 1. Unwinding section; 2. Rewinding section; 3. Printing section; 31. Guide roller; 4. Stop system; 41. Stop device; 411. Base; 412. Stop roller; 413. Driving component; 5. Braking system; 51. Braking device; 511. Brake; 512. Brake pad; 6. Detection system; 61. Photoelectric sensor; 7. Control system; 8. Paper; 9. Emergency stop system; 10. Control component. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate positions or positional relationships only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0040] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0041] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0042] If not specifically stated, in the present invention, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true or exists and B is false or does not exist; A is false or does not exist and B is true or exists; or both A and B are true or exist.

[0043] Combination Figures 1 to 4As shown, the printing machine of this embodiment includes an unwinding section 1, a rewinding section 2, a printing section 3, a stop system 4, a brake system 5, a detection system 6 and a control system 7. The unwinding section 1 includes a first reel rotatably arranged and wound with a paper 8 to be printed. The rewinding section 2 includes a second reel rotatably arranged to wind the printed paper 8. The printing section 3 is located between the unwinding section 1 and the rewinding section 2 on the moving path of the paper 8, and is configured to print a pattern on the paper 8 passing through it.

[0044] The stopping system 4 includes a stopping device 41 located upstream of the printing section 3 on the moving path of the paper 8, and the stopping device 41 is configured to prevent the paper 8 from continuing to move toward the winding section 2. The braking system 5 includes a braking device 51 for braking the first reel or the second reel. The detection system 6 is configured to detect whether the paper 8 is broken.

[0045] The control system 7 is signal-connected to the stop system 4, the brake system 5 and the detection system 6 respectively, and is configured to control the stop device 41 to prevent the movement of the paper 8 and control the brake system 5 to brake the first reel and / or the second reel after the paper 8 breaks.

[0046] In this embodiment, after the paper 8 breaks, the control system 7 can emergency brake the unwinding part 1 and the rewinding part 2 and press the paper 8 to prevent the paper 8 from continuing to move forward, which is helpful to improve the problem in the prior art that the paper 8 is easily rolled into the downstream ink tank or wrapped around the printing plate roller after breaking, resulting in a complicated recovery process.

[0047] The brake system 5 includes two brake devices 51, and the two brake devices 51 are respectively configured to brake the first reel and the second reel. After the paper 8 breaks, both the reeling part 2 and the unreeling part 1 are braked, which is beneficial to prevent the paper 8 from continuing to move, and is beneficial to reducing the complexity of the recovery work and improving the efficiency.

[0048] See also Figure 2 The stopping device 41 includes two bases 411 arranged at intervals, a stopping roller 412 and a driving component 413. The two ends of the stopping roller 412 are respectively installed on the two bases 411, and are configured to move relative to the bases 411 in a direction perpendicular to the axial direction of the stopping roller 412 to switch between a first position for pressing the paper 8 to prevent the paper 8 from moving and a position for releasing the paper 8. The driving component 413 is configured to drive the stopping roller 412 to move relative to the base 411.

[0049] In some embodiments, the driving component 413 includes a cylinder, which can quickly drive the stop roller 412 to a first position where the stop roller 412 presses the paper 8 to stop the paper 8 from moving, so as to stop the paper 8 from moving further.

[0050] In some embodiments, a slide is provided on the base 411, and the stop device 51 further includes a slider 414 movably provided on the slide, and the stop roller 412 is mounted on the slider 412. The two bases 411 are respectively provided with slides, and the two slides are respectively provided with a slider 414, and the two ends of the stop roller 412 are respectively mounted on the two sliders 414. The slider 414 cooperates with the slide, which is conducive to improving the smoothness of the movement of the stop roller 412, reducing the probability of failure of the stop device 41, and ensuring that once the paper breaks, the paper 8 is quickly stopped from moving further.

[0051] In some embodiments, the printing section 3 includes a printing section body and a guide roller 31 for guiding the paper 8 to the printing section body, the stop roller 412 and the guide roller 31 are arranged side by side and can move relative to the guide roller 31 to switch between a first position and a second position, the stop roller 412 in the first position presses the paper 8 against the guide roller 31, and the stop roller 412 in the second position is arranged at an interval. The guide roller 31 and the stop roller 412 are arranged in parallel, and the driving component 413 drives the stop roller 412 to move relative to each other.

[0052] See also Figure 3 The brake device 51 includes a brake pad 512 drivingly connected to the first reel or the second reel and a brake 511 frictionally braking the brake pad 512 .

[0053] See also Figure 4 The control system 7 includes a first controller 71 connected to the detection system 6 by signal, the printing press also includes an emergency stop system 9 connected to the first controller 71 by signal, the unwinding section 1 also includes a first motor driving the first reel; the rewinding section 2 also includes a second motor driving the second reel, and the emergency stop system 9 is respectively connected to the first motor and the second motor by signal, so as to shut down the first motor and the second motor based on the emergency stop signal of the first controller 71 after the paper 8 breaks.

[0054] After the paper breaks, the emergency stop system 9 controls the winding part 2 and the unwinding part 1 to stop to prevent the paper from continuing to move. In some embodiments, the first controller 71 includes a PLC.

[0055] The control system 7 also includes a second controller 72 connected to the emergency stop system 9 by signal, and the second controller 72 is respectively connected to the stop system 4 and the brake system 5 by signal, so as to control the stop device 41 to prevent the movement of the paper 8 and control the brake system 5 to brake the first reel and / or the second reel based on the emergency stop signal of the first controller 71.

[0056] In this embodiment, the first controller 71, the emergency stop system 9, the printing section 3, the unwinding section 1, the rewinding section 2, etc. are the main components of the original printing press. In this embodiment, the second controller 72, the stop system 4 and the brake system 5 are added on the basis of the original printing press. Compared with the original printing press, after the paper 8 breaks, the brake system 5 can emergency brake the unwinding section 1 and the rewinding section 2 and the stop system 4 presses the paper 8 to prevent the paper 8 from moving forward, which is conducive to improving the problem in the prior art that after the paper 8 breaks, it is easy to be rolled into the downstream ink tank or wrapped around the printing plate roller, resulting in a complicated recovery process.

[0057] In some embodiments, the second controller 72 includes a PLC.

[0058] The stopping system 4 further includes a first solenoid valve connected to a cylinder driving the stopping roller 412 to switch between the first position and the second position. The second controller 72 is connected to the first solenoid valve signal to control the cylinder to work through the first solenoid valve.

[0059] The brake 511 of the brake system 5 is a pneumatic brake. The brake system 5 also includes a second solenoid valve connected to the brake, and the second controller 72 is connected to the second solenoid valve signal to control the brake 511 to switch between a braking state and a brake release state.

[0060] In some embodiments, the detection system 6 includes a photoelectric sensor 61 arranged opposite to the paper 8 and emitting a light beam. The photoelectric sensor 61 determines whether the paper 8 is detected based on the obstruction or reflection of the light beam by the paper 8. The control system 8 determines that the paper 8 is broken based on the failure of the photoelectric sensor 61 to detect the paper 8.

[0061] In some embodiments, the detection system 6 includes a plurality of photoelectric sensors 61 arranged along the path of the paper 8. The control system 6 is signal-connected to the plurality of photoelectric sensors 61, respectively, and is configured to determine that the paper 8 is broken when any photoelectric sensor 61 fails to detect the paper 8. The plurality of photoelectric sensors 6 are arranged along the path of the paper, so that the paper break can be detected in time, thereby reducing the harm caused by the paper break.

[0062] The printing press further comprises a control component 10 connected to the control system 7 by signals. The control system 7 is configured to respond to an operator's operation to determine whether to start the function of controlling the stop system 4 and / or the brake system 5 according to the break of the paper 8 .

[0063] Before starting the printing press, the operator is required to pass the paper 8 through multiple printing sections 3 and then connect it to the second reel of the winding section 2. During the paper threading process, the stop system 4 and / or the brake system 5 will be shut down according to the breakage of the paper 8, which is helpful to prevent false alarms and malfunctions of the stop system 4 and / or the brake system 5, and to avoid the stop roller 412 from operating and injuring the operator.

[0064] In some embodiments, the photoelectric paper stop system prevents the broken paper 8 from continuing to move forward, and the paper stop system detection system 6, emergency stop system 9, stop system 4, brake system 5. The detection system 6 is used to detect paper breakage in the equipment and send an emergency stop signal. The emergency stop system 9 stops the equipment by cutting off the control output. The brake system 5 is achieved by installing a pneumatic brake 511 and a brake pad 512 at the synchronous wheels of the first motor of the unwinding section 1 and the second motor of the rewinding section 2 of the printing press. The stop system 4 is a set of stop devices 51 and infrared sensors installed at the rewinding traction entrance of the printing section 3, the unwinding traction outlet, and the top of the oven of the printing section 3 (color group). The working principle of the system is as follows:

[0065] When paper breaks during operation of the printing press, the infrared sensor will immediately detect the paper break and immediately send a signal to the first controller 71 (PLC central controller of the printing press). After receiving the signal from the infrared sensor, the first controller 71 will start the emergency stop system 9 and pass the signal to the second controller 72 (PLC central controller of the paper stop system). The second controller 72 is responsible for further processing the signal and sending instructions to the stop system and the brake system respectively.

[0066] When the first controller 71 receives a signal to start the emergency stop system, the printing roller and the rubber roller will be lifted to the original printing plate roller, the vehicle speed will be reduced, and the equipment will stop working. After receiving the emergency stop signal, the second controller 72 will immediately start the stop system 4 and the brake system. The stop system 4 will quickly perform a closing operation to prevent the broken paper from continuing to be rolled into the printing machine or the ink from being brought into the oven to contaminate the equipment components, thereby avoiding equipment damage and the like. At the same time, the brake system will increase the air pressure of the retracting and unreeling brake, increase the friction between the brake pad 512 and the synchronous wheel, to ensure that the equipment can stop running safely and quickly.

[0067] like Figure 2 The left and right ends of the stop roller 412 are respectively provided with a slider 414, and the slider 414 is installed on the bases 411 at both ends, and a driving component 413 is installed on each base 411. The brake system 5 is composed of a brake 511 and a brake pad 512.

[0068] When the infrared sensor installed in the printing section 3 detects that the paper is broken, it sends a signal to the emergency stop system. The emergency stop system quickly transmits the signal to the stop system 4 and the brake system 5. The sensor of the emergency stop system 9 sends a signal to the second controller 72, and the second controller 72 transmits the signal to the stop system 4 and the brake system 5. The driving component 413 and the backstop roller 412 are in action. Under the action of the driving component 413, the backstop roller 412 quickly acts downward to press the paper. At the same time, the brake air pressure at the winding position increases and acts on the brake 511. By increasing the brake air pressure, the friction between the brake 511 and the brake pad 512 is strengthened to decelerate. Through the simultaneous action of the backstop roller and the pneumatic brake mechanism, the broken paper can be controlled in the printing section 3 where the base paper is broken, and the paper 8 running toward the winding end due to inertia is pulled to prevent the broken paper from continuing to enter the inside of the printing machine or bringing ink into the difficult-to-clean parts such as the oven, which pollutes the equipment and components, effectively reducing the time of manual paper threading and cleaning equipment, saving production costs, improving production efficiency, and maintaining production continuity.

[0069] The control system can quickly detect abnormal conditions when the paper 8 breaks, and immediately activate the stop system 4 to prevent the broken paper from continuing to be rolled into the printing machine, or bringing ink into the oven to contaminate equipment components, thereby avoiding equipment damage and the like. The paper threading time after the paper breaks is saved by 10-20 minutes, and the operator's time for cleaning equipment, dealing with paper being rolled into the ink tank, threading paper, and equipment downtime is reduced. Various production costs are saved, production efficiency is improved, and production continuity and product quality stability are ensured. The device has a simple structure and low maintenance cost, and can be promoted and used on reel-type printing, laminating, film, papermaking and other equipment, and has important practical value and market potential.

[0070] The components of the stop device 41 and the brake device 51 are modularly designed to be easy to disassemble and install, which is convenient for daily maintenance and parts replacement. The paper stopping system is controlled by an independent second controller 72, which has little impact on the original system of the equipment.

[0071] The paper breaking stop device 51 has a universal structure and can be widely used in reel-type printing, laminating, film, papermaking and other equipment, especially in the production, printing and processing of tipping paper and lining paper, and products with low grammage and thin paper. Slider structures are arranged at both ends of the stop roller 412 and are controlled by the driving component 413 to move up and down in a straight line.

[0072] The printing machine of this embodiment can make up for the lack of corresponding targeted measures when paper breaks occur in roll-type equipment such as printing in the current market. The detection system 6 can detect abnormal conditions when the paper breaks and issue an audible and visual alarm, and send a signal to the stop system 4 and the brake system 5, and immediately start the stop system. The stop roller 412 on the top of the oven can quickly close and pull the broken paper 8 that runs towards the winding part due to inertia. At the same time, the rewinding and unwinding brake is activated, the brake air pressure increases, and the brake pad is controlled to rub, reduce the speed, prevent the broken paper from continuing to enter the inside of the printing machine, or bring ink into the oven to contaminate equipment and components, and avoid equipment damage. The device reduces the time for operators to clean equipment, thread paper, etc., saves various production costs, improves production efficiency, and ensures production continuity and product stability. The device can be promoted and used on reel-type printing, compounding, film, papermaking and other equipment.

[0073] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A printing press, characterized in that: include: The unwinding section (1) comprises a first reel which is rotatably arranged and wound with paper (8) to be printed; A reel (2) comprising a second reel rotatably arranged to reel in the printed paper (8); a printing section (3), located between the unwinding section (1) and the rewinding section (2) on the moving path of the paper (8), and configured to print a pattern on the paper (8) passing through it; A stopping system (4), comprising a stopping device (41) located upstream of the printing section (3) on the moving path of the paper (8), the stopping device (41) being configured to prevent the paper (8) from continuing to move toward the winding section (2); a brake system (5), comprising a brake device (51) for braking the first reel or the second reel; A detection system (6) configured to detect whether the paper (8) is broken; The control system (7) is connected to the stop system (4), the brake system (5) and the detection system (6) by signals respectively, and is configured to control the stop system (4) to prevent the movement of the paper (8) and control the brake system (5) to brake the first reel and / or the second reel after the paper (8) breaks.

2. The printing press according to claim 1, characterized in that The brake system (5) comprises two brake devices (51), and the two brake devices (51) are respectively configured to brake the first reel and the second reel.

3. The printing press according to claim 1, characterized in that: The stopping device (41) comprises: two bases (411) arranged at intervals; and a stop roller (412), the two ends of which are respectively mounted on the two bases (411), and configured to be movable relative to the bases (411) in a direction perpendicular to the axial direction of the stop roller (412), so as to switch between a first position for pressing the paper (8) to prevent the paper (8) from moving and a position for releasing the paper (8); The driving component (413) is configured to drive the stop roller (412) to move relative to the base (411).

4. The printing press according to claim 3, characterized in that: The driving component (413) includes a cylinder.

5. The printing press according to claim 3, characterized in that: The base (411) is provided with a slideway, the stopping device (51) further comprises a slider (414) movably arranged on the slideway, and the stopping roller (412) is mounted on the slider (412).

6. The printing press according to claim 3, characterized in that: The printing section (3) comprises a printing section body and a guide roller (31) for guiding the paper (8) toward the printing section body; the stop roller (412) and the guide roller (31) are arranged side by side and can move relative to the guide roller (31) to switch between the first position and the second position; the stop roller (412) in the first position presses the paper (8) against the guide roller (31); and the stop roller (412) in the second position is arranged at an interval with the paper.

7. The printing press according to claim 1, characterized in that: The brake device (51) comprises a brake pad (512) drivingly connected to the first reel or the second reel and a brake (511) frictionally braking the brake pad (512).

8. The printing press according to claim 1, characterized in that: The control system (7) includes a first controller (71) connected to the detection system (6) by signal, the printing press also includes an emergency stop system (9) connected to the first controller (71) by signal, the unwinding section (1) also includes a first motor driving the first reel; the rewinding section (2) also includes a second motor driving the second reel, the emergency stop system (9) is connected to the first motor and the second motor by signal respectively, so as to shut down the first motor and the second motor based on the emergency stop signal of the first controller (71) after the paper (8) breaks.

9. The printing press according to claim 8, characterized in that The control system (7) further comprises a second controller (72) connected to the emergency stop system (9) by signal, and the second controller (72) is respectively connected to the stop system (4) and the brake system (5) by signal, so as to control the stop device (41) to prevent the movement of the paper (8) and control the brake system (5) to brake the first reel and / or the second reel based on the emergency stop signal of the first controller (71).

10. The printing press according to claim 1, characterized in that The detection system (6) comprises a photoelectric sensor (61) arranged opposite to the paper (8) and emitting a light beam, wherein the photoelectric sensor (61) determines whether the paper (8) is detected based on whether the paper (8) blocks or reflects the light beam, and the control system (8) determines that the paper (8) is broken based on the fact that the photoelectric sensor (61) does not detect the paper (8).

11. The printing press according to claim 10, characterized in that The detection system (6) comprises a plurality of photoelectric sensors (61) arranged along the path of the paper (8), the control system (6) being signal-connected to the plurality of photoelectric sensors (61) respectively, and being configured to judge that the paper (8) is broken when any of the photoelectric sensors (61) fails to detect the paper (8).

12. The printing press according to claim 10 or 11, characterized in that: The photoelectric sensor (61) includes an infrared sensor.

13. The printing press according to claim 1, characterized in that The invention also comprises a control component (10) connected to the control system (7) by signal, wherein the control system (7) is configured to respond to an operator's operation to determine whether to start the function of controlling the stop system (4) and / or the brake system (5) according to the breakage of the paper (8).

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