CN-122008708-A - Paper tension and length adjusting system, method and printing device

Abstract

The application discloses a paper tension and length adjusting system, a paper tension and length adjusting method and a printing device, and relates to the technical field of printers. According to the application, the input length, the output length and the position of the tension roller of the paper can be detected and controlled in a coordinated manner before, during and after the paper enters the printing area, so that the paper is always tensioned, flattened and controllable in length in the printing area. When the paper feeding and discharging amount is consistent and the tension roller is positioned in the preset active area, the system can stably run and maintain constant tension, and when the paper feeding and discharging amount is different or the tension roller deviates from the preset active area, the system can automatically adjust the tension force according to the position and the length difference of the tension roller and coordinate the paper feeding and discharging action, so that the tension roller returns to the preset active area, thereby effectively compensating the paper length change, avoiding the paper loosening or excessive stretching of a printing area and improving the stability and the printing precision of the printing process.

Inventors

• WANG DONGJIE
• BU YUHANG

Assignees

• 浙江蓝标数印科技有限公司

Dates

Publication Date

20260512

Application Date

20260313

Claims (10)

1. 1. A paper tension and length adjustment system, comprising a source paper length detection device, a paper tension control device, a printing zone adsorption device, an output paper length detection device and a length controller; the source paper length detection device is used for conveying paper into the paper tension control device and synchronously detecting the input length of the paper when the paper is conveyed; the paper tension control device is used for keeping the paper to be stretched and flattened and then enters the printing area adsorption device to be adsorbed and printed, and the printed paper is output from the printing area adsorption device to the output paper length detection device; the output paper length detection device is used for conveying printed paper and synchronously detecting the output paper length when the printed paper is conveyed; The paper tension control device comprises a tensioning roller, a pressure adjusting device and a position detecting device, wherein the tensioning roller is positioned below the input end of the printing area adsorption device, the tensioning roller is used for tensioning and flattening paper output from the source paper length detecting device, the pressure adjusting device is arranged on one side, adjacent to the source paper length detecting device, of the tensioning roller to provide tensioning force, and the position detecting device is positioned below the tensioning roller and is suitable for detecting the position of the tensioning roller; The length controller is electrically connected to the pressure adjusting device, the position detecting device, the source paper length detecting device and the output paper length detecting device; the length controller is used for controlling the pressure regulating device to provide constant tensioning force for the tensioning roller and controlling the source paper length detecting device and the output paper length detecting device to synchronously drive when the position detecting device detects that the position of the tensioning roller is in a preset active area; The length controller is used for adjusting the tension provided by the pressure adjusting device to increase or decrease and controlling the source paper length detecting device and the output paper length detecting device to enable the tension roller to be located in a preset active area according to the position of the tension roller and the difference value between the input paper length and the output paper length when the position detecting device detects that the position of the tension roller is located outside the preset active area.
2. 2. The paper tension and length adjustment system of claim 1, wherein the pressure adjustment device comprises two pneumatic support structures, one at each end of the tension roller.
3. 3. The paper tension and length adjustment system of claim 2, wherein each of the pneumatic support structures comprises a pneumatic valve that controls tension by adjusting pneumatic pressure and a pneumatic tube that is connected to an external air source.
4. 4. A sheet tension and length adjustment system as claimed in claim 2, wherein the position detection means comprises two magnetic bars, each of which is provided below an end of the tension roller, a center point of the magnetic bars coinciding with a center point of the preset active area.
5. 5. The paper tension and length adjustment system according to claim 1, wherein the source paper length detection device includes a first driving conveying roller, a first driven conveying roller, a first driving device, and a first nip control device, the first driving conveying roller being disposed in parallel with the first driven conveying roller, paper being capable of being pinched between the first driving conveying roller and the first driven conveying roller and conveyed, the first driving device being connected to the first driving conveying roller, the first nip control device being connected to the first driven conveying roller, the first nip control device controlling whether the source paper length detection device conveys paper by controlling the first driven conveying roller to approach or separate from the first driving conveying roller.
6. 6. The paper tension and length adjustment system according to claim 1, wherein the output paper length detection device includes a second driving conveying roller, a second driven conveying roller, a second driving device, and a second nip control device, the second driving conveying roller being disposed in parallel with the second driven conveying roller, between which the printed paper can be gripped and conveyed, the second driving device being connected to the second driving conveying roller, the second nip control device being connected to the second driven conveying roller, the second nip control device controlling whether the output paper length detection device conveys the printed paper by controlling the second driven conveying roller to approach or separate from the second driving conveying roller.
7. 7. The sheet tension and length adjustment system as recited in claim 1 further including an output guide roller positioned below an output end of the print zone suction device, the output guide roller guiding printed sheets into the output sheet length detection device.
8. 8. The paper tension and length adjustment system of claim 1, wherein the print zone suction device comprises an input roller, a suction plate, and an output roller, the input roller, the suction plate, and the upper surface of the output roller being disposed flush, the input roller forming an input end of the print zone suction device, the output roller forming an output end of the print zone suction device, the upper surface of the suction plate being provided with a plurality of suction holes.
9. 9. A paper tension and length adjustment method for use in the paper tension and length adjustment system of any one of claims 1 to 8, the method comprising: Acquiring single printing time length of the printing area adsorption device, controlling the source paper length detection device and the output paper length detection device to convey paper according to the single printing time length interval, acquiring the paper input length detected by the source paper length detection device, and acquiring the paper output length detected by the output paper length detection device; the paper output from the source paper length detection device is tensioned and flattened by a paper tension control device to provide constant tension, and the paper is fed into the printing area adsorption device for printing; Acquiring the position of the tensioning roller detected by the position detection device by utilizing a length controller during each printing, and judging whether the position of the tensioning roller is positioned in a preset active area or not; controlling a pressure adjusting device of the paper tension control device to provide constant tension for the tensioning roller and controlling the source paper length detection device and the output paper length detection device to synchronously drive when the position of the tensioning roller is in a preset active area; Acquiring a difference value between the input length of the paper and the output length of the paper when the position of the tensioning roller is outside a preset activity area, and judging the size relation between the paper feeding amount and the output paper amount according to the position of the tensioning roller and the difference value; When the paper feeding amount is larger than the output paper amount, controlling the source paper length detection device to stop, controlling the pressure adjustment device to reduce the tension and synchronously controlling the output paper length detection device to output the paper with the difference length until the tension roller is positioned at the central position of the preset active area, and controlling the pressure adjustment device to maintain constant tension after the tension roller is positioned at the central position of the preset active area; When the paper feeding amount is smaller than the output paper amount, the output paper length detection device is controlled to stop, the pressure adjustment device is controlled to increase the tension to synchronously control the source paper length detection device to output the paper with the difference length until the tension roller is positioned at the center position of the preset active area, and the pressure adjustment device is controlled to maintain constant tension after the tension roller is positioned at the center position of the preset active area.
10. 10. A printing apparatus comprising the sheet tension and length adjustment system of any one of claims 1 to 8.

Description

Paper tension and length adjusting system, method and printing device Technical Field The application relates to the technical field of printers, in particular to a paper tension and length adjusting system, a paper tension and length adjusting method and a printing device. Background With the development of digital printing, ink-jet printing and continuous medium printing technologies, printing equipment has put forward higher requirements on the evenness and tension stability of paper in a printing area, and especially in a long-range printing or continuous printing scene, the paper often generates tiny expansion and contraction changes due to printing beat changes, printing ink quantity influences or mechanical errors in the printing process. In the prior art, a common paper conveying system mostly adopts a fixed tension structure or a simple paper feeding and discharging synchronous control mode, and lacks the capability of detecting and feeding back the input length and the output length of paper in real time. When the length of paper in the printing area changes, the paper feeding mechanism and the paper discharging mechanism cannot compensate in time, so that the paper in the printing area is easily accumulated or tensioned, and further wrinkling of the paper, deformation of a printing pattern and even equipment failure are caused. In addition, although some systems are provided with tensioning rollers or buffer structures, closed-loop control cannot be performed by combining paper length change, tensioning force adjustment is lag or uncontrollable, and different printing working conditions are difficult to adapt. The paper feeding mechanism before printing and the paper discharging mechanism after printing usually operate independently, so that the actual length change and the tension state of paper in a printing area are difficult to sense in real time, when the printing beat changes or the paper is slightly deformed due to the printing process, the paper feeding and discharging difference cannot be effectively compensated, the paper tension fluctuation in the printing area is easy to cause, and the problems of overprinting errors, image stretching or paper jam and the like are further caused. Therefore, the paper tension and length adjusting system capable of combining paper length detection, tension roller position detection and tension adjustment is provided, and has important significance for improving the stability and printing quality of printing equipment. Disclosure of Invention Based on the above, the system, the method and the printing device for adjusting the paper tension and the length are provided, and are used for solving the technical problems that the paper is easy to loose, stretch or wrinkle in a printing area due to the fact that the paper feeding amount and the paper discharging amount are asynchronous, the paper stress is uneven or the length of the paper in the printing area is changed in the existing continuous printing or long-range printing process, so that the printing precision, the image quality and the running stability of equipment are affected. In one aspect, a paper tension and length adjustment system is provided, the system comprising a source paper length detection device, a paper tension control device, a print zone adsorption device, an output paper length detection device, and a length controller; the source paper length detection device is used for conveying paper into the paper tension control device and synchronously detecting the input length of the paper when the paper is conveyed; the paper tension control device is used for keeping the paper to be stretched and flattened and then enters the printing area adsorption device to be adsorbed and printed, and the printed paper is output from the printing area adsorption device to the output paper length detection device; the output paper length detection device is used for conveying printed paper and synchronously detecting the output paper length when the printed paper is conveyed; The paper tension control device comprises a tensioning roller, a pressure adjusting device and a position detecting device, wherein the tensioning roller is positioned below the input end of the printing area adsorption device, the tensioning roller is used for tensioning and flattening paper output from the source paper length detecting device, the pressure adjusting device is arranged on one side, adjacent to the source paper length detecting device, of the tensioning roller to provide tensioning force, and the position detecting device is positioned below the tensioning roller and is suitable for detecting the position of the tensioning roller; The length controller is electrically connected to the pressure adjusting device, the position detecting device, the source paper length detecting device and the output paper length detecting device; the length controller is used for controlling the pressure regulating device to provide