Paper adjusting device and adjusting method for decorative paper printing machine

Abstract

The invention discloses a decorative paper printing machine paper adjusting device and adjusting method.The decorative paper printing machine paper adjusting device comprises a rack, a plurality of first supporting rods rotationally connected with the rack and a plurality of first adjusting rollers rotationally connected with the first supporting rods, the ends of one sides of all the first supporting rods are coaxially connected, and the first adjusting rollers are arranged at the ends of the first supporting rods; the rack is provided with a first adjusting mechanism for driving the first supporting rod to rotate around the end, and the end of the first supporting rod is provided with a second adjusting mechanism for adjusting local tension of paper. The overall tension of the paper is preliminarily adjusted through the first adjusting mechanism, and then the second adjusting mechanism is combined to accurately adjust the local tension, so that the tension of the paper is more uniform and stable in the whole conveying process. And the first nozzle and the second nozzle can assist in tension adjustment by adjusting the airflow size and direction, so that the good contact state between the paper and the adjusting roller is further ensured, and the printing precision and consistency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of paper adjustment, and in particular to a paper adjustment device and an adjustment method for a decorative paper printing machine. Background Art

[0002] The paper adjustment device of the traditional decorative paper printing machine is usually relatively simple, mainly relying on mechanical structure for tension adjustment. Usually, the paper tension is controlled by adjusting the position of the tension roller. This method has obvious disadvantages. When the paper tension on one side of the tension roller needs to be adjusted, if the position of the tension roller is changed, the paper tension on the other side of the tension roller will also change. In this way, it is necessary to adjust the position of the tension roller in the entire system, and the function of local tension adjustment is lacking.

[0003] Secondly, the paper tension changes frequently, and the traditional mechanical adjustment mechanism responds slowly. When the paper tension changes during the printing process, the traditional adjustment device takes a certain amount of time to respond, which may cause instability in the production process and reduce production efficiency. Summary of the invention

[0004] In order to solve the problem of adjusting the local tension of paper, the present application provides a paper adjustment device and an adjustment method for a decorative paper printing machine.

[0005] The present application provides a paper adjustment device and adjustment method for a decorative paper printing machine, which adopts the following technical solution: it includes a frame, a plurality of first support rods rotatably connected to the frame, and a plurality of first adjustment rollers rotatably connected to the first support rods, one side ends of all the first support rods are coaxially connected, the first adjustment roller is arranged at the end of the first support rod, the frame is provided with a first adjustment mechanism for driving the first support rod to rotate around the end, and the end of the first support rod is provided with a second adjustment mechanism for adjusting the local tension of the paper.

[0006] By adopting the above scheme, the first support rod can change the position and angle of the first adjusting roller by rotating, so as to achieve preliminary adjustment of the paper tension. Different first support rods can act independently or in coordination to adapt to different paper specifications and tension requirements; the second adjusting mechanism can accurately adjust the local tension of the paper. When the tension of the paper is uneven in certain areas, the second adjusting mechanism can adjust the area in a targeted manner to restore the tension of the paper to an appropriate range.

[0007] Preferably, the second adjusting mechanism includes a plurality of second support rods rotatably connected to the end of the first support rod, an automatic adjusting module arranged on both sides of the frame, and an auxiliary module arranged on the frame, the end of one side of the second support rod is coaxial with the first adjusting roller, the end of the second support rod is rotatably connected to the second adjusting roller, the paper passes around the first adjusting roller and the second adjusting roller, the automatic adjusting module can automatically adjust the tension applied by the second adjusting roller to the paper according to the change of the paper tension, and the auxiliary module assists the automatic adjusting module so that the automatic adjusting module can more accurately adjust the local tension of the paper.

[0008] By adopting the above solution, the second adjusting roller and the first adjusting roller work together on the paper, and on the basis of the first adjusting roller making a preliminary adjustment of the overall tension, the local tension of the paper is further finely adjusted. The cooperation of the two can make the tension of the paper more uniform and stable during the entire transmission process, thus improving the printing quality.

[0009] Preferably, the automatic adjustment module includes a plurality of second slots arranged on both sides of the frame, the second adjusting rod passes through the second slots, second sliding slots are fixedly connected on both sides of the frame, the second sliding slots are slidably connected to the second slider, the second slider is slidably connected to the second connecting rod, the second connecting rod is rotatably connected to the second adjusting roller end, the frame and the second slider are both provided with directional wheels, a plurality of guide rails are fixedly connected to the side of the frame, a guide block is slidably connected in the guide rails, one end of the guide block is connected to the second adjusting roller by a rope, the rope changes direction through the directional wheel, and the other end is connected to a weight rod.

[0010] By adopting the above scheme, the second adjusting roller itself has a certain gravity. If there is no balancing effect of the weight rod, the gravity of the second adjusting roller will directly act on the paper, which may cause the pressure on the paper to be unstable or too large or too small, thereby affecting the tension control of the paper. Through the setting of the weight rod, the gravity of the second adjusting roller can be accurately offset, so that the force applied to the paper by the second adjusting roller is only an adjustment force to achieve appropriate tension or pressure; with the balance of the weight rod, the operator can more accurately adjust the effect of the second adjusting roller on the paper. Because the force acting on the paper at this time is mainly a designed and calculated force used to achieve specific tension requirements, the balance of the weight rod, even if there are some minor changes, can maintain the appropriate force of the second adjusting roller on the paper through the automatic adjustment of the weight rod.

[0011] Preferably, the frame is rotatably connected to a first rotating shaft, a first nozzle is mounted on the first rotating shaft, the first nozzle faces the paper, and the second support rod is rotatably connected to a first shifting rod, the first shifting rod passes through the first rotating shaft.

[0012] By adopting the above scheme, the air nozzle assists in fine-tuning the local tension. When the local tension of the paper changes, the first nozzle can quickly assist the second adjustment mechanism in fine-tuning the tension by adjusting the size and direction of the airflow. When the local tension of the paper increases, increasing the airflow intensity of the nozzle can separate the paper from the second adjustment roller more quickly and reduce the tension; when the local tension of the paper decreases, reducing the airflow intensity of the nozzle can make the contact between the paper and the second adjustment roller closer and increase the tension; similarly, the second nozzle can assist in adjusting the tension between the first adjustment roller and the paper.

[0013] Preferably, the first adjustment mechanism comprises a plurality of first sliding grooves fixedly connected to both sides of the frame, the first sliding grooves are slidably connected to the first slider, the first support rod is provided with a first sliding groove, the first slider is fixedly connected to the first connecting rod, the end of the first connecting rod can move along the first sliding groove, and the frame is provided with a motor which drives the first slider to move through a screw assembly.

[0014] By adopting the above solution, the motor drives the first slider to move through the screw assembly, and the screw assembly has high-precision transmission characteristics, which can convert the rotational motion of the motor into the linear motion of the first slider, and can achieve small displacement adjustment. By accurately controlling the speed and direction of the motor, the movement speed and direction of the first slider can be accurately controlled, thereby controlling the movement of the first adjustment rod to achieve accurate adjustment of the paper tension.

[0015] Preferably, a first slot is provided on the side of the frame, one end of the first support rod is located in the first slot, and the other end passes through the side of the frame, the end of the second adjusting roller is fixedly connected to a connecting shaft, the connecting shaft passes through the end of the first support rod, and the second support rod is sleeved on the connecting shaft.

[0016] By adopting the above solution, when the overall tension of the paper needs to be adjusted, the first slider can quickly slide on the first sliding groove to drive the first connecting rod and the first support rod to move, thereby quickly responding to tension changes. This rapid response capability helps to maintain the stability of the overall tension of the paper and improve printing quality and production efficiency.

[0017] Preferably, a tension sensor is provided between the connecting shaft and the first support rod.

[0018] By adopting the above solution, when the tension sensor detects that the paper tension is too large, the control system can drive the first slider to move through the motor and the screw assembly, adjust the angle of the first support rod, reduce the pressure of the first adjustment roller on the paper, and thus reduce the paper tension; at the same time, the second adjustment mechanism automatically adjusts the tension within a certain range to ensure the uniformity of the local tension of the paper.

[0019] A paper adjustment method for a decorative paper printing machine includes the following methods: S1, firstly, the paper passes through the first adjusting roller and the second adjusting roller. Under the action of the external device to reel the paper, the paper is closely attached to the first adjusting roller and the second adjusting roller. At this time, the pressure sensor reads the initial tension of different parts of the paper; S2, respectively controlling the first adjustment mechanisms on both sides to respectively control the corresponding first adjustment rollers, so as to adjust the tension of the paper on the corresponding side, thereby achieving a rough adjustment of the paper; S3, after the rough adjustment is completed, the second adjustment mechanism automatically adjusts the local tension of the paper; S4. When the paper tension changes beyond the automatic adjustment range, perform coarse adjustment to adjust the paper tension on the corresponding side.

[0020] By adopting the above scheme, the adjustment method realizes precise control of the paper tension of the decorative paper printing machine by combining coarse adjustment and local automatic adjustment, as well as re-coarse adjustment when necessary. The coarse adjustment can quickly adjust the overall tension of the paper, and the automatic adjustment can realize local adjustment of the paper tension, and can quickly adjust itself when the paper changes within a certain range.

[0021] Preferably, the specific method of coarse adjustment in step S2 is as follows: a motor drives the first slider to move along the first sliding groove, the first slider drives the first connecting rod to move together, the end of the first connecting rod moves along the first sliding groove, and under the action of the end of the first connecting rod, the first adjusting roller can rotate around one end, thereby changing the position of the first adjusting roller, so that the first adjusting roller applies different tensioning forces to the paper, thereby quickly realizing coarse adjustment of the paper.

[0022] By adopting the above scheme, rapid coarse adjustment of the paper can be achieved, and the accuracy and efficiency of the motor drive can achieve rapid and accurate response; the first connecting rod plays a key transmission role, converting the linear motion of the slider into the rotational motion of the first adjustment roller to quickly respond to changes in paper tension.

[0023] Preferably, the specific method of automatic adjustment in step S3 is as follows: the weight rod offsets part of the gravity of the first adjusting roller, so that the second adjusting roller applies a tension within a certain range to the paper, and the paper tension changes within the applied tension range, the second adjusting roller automatically adjusts the tension on the paper, and the first nozzle increases and decreases the airflow to achieve auxiliary adjustment of the paper tension; When the paper tension becomes smaller, the second adjusting roller will press down the paper, which increases the contact area between the paper and the first adjusting roller on the one hand, and increases the length of the paper between the first adjusting roller and the second adjusting roller on the other hand; When the paper tension increases, the second adjusting roller is lifted by the paper, which reduces the contact area between the paper and the first adjusting roller on the one hand, and reduces the length of the paper between the first adjusting roller and the second adjusting roller on the other hand.

[0024] By adopting the above scheme, in the local tension adjustment of the paper, the weight rod plays a key balancing role, offsetting part of the gravity of the second adjustment roller, so that the second adjustment roller applies appropriate pressure to the paper. When the paper is loose, the weight rod prompts the second adjustment roller to automatically press the paper under the action of gravity, increasing the area of ​​the paper wrapped around the first adjustment roller, achieving fast and automatic local tension adjustment, reducing downtime adjustment time, and improving production efficiency. At the same time, the first air nozzle assists in applying pressure to make the paper better adhere to the first adjustment roller, enhance the friction between the paper and the first adjustment roller, and work together with the second adjustment roller to accurately control the local tension of the paper, ensuring that the paper always maintains a suitable tension state during the printing process, improving printing quality and production stability.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first adjustment mechanism makes a preliminary adjustment to the overall tension of the paper, and then the second adjustment mechanism makes precise adjustment to the local tension, so that the tension of the paper is more uniform and stable during the entire transmission process. The first nozzle and the second nozzle can assist in tension adjustment by adjusting the size and direction of the airflow, further ensuring a good contact state between the paper and the adjustment roller, and improving the accuracy and consistency of printing.

[0026] 2. The weight rod accurately offsets the gravity of the second adjusting roller, making the force of the second adjusting roller on the paper more stable and controllable. The weight rod can also automatically adjust to maintain the appropriate force of the second adjusting roller on the paper. The tension sensor between the connecting shaft and the first support rod can monitor the paper tension in real time. When the tension is abnormal, the control system can adjust the first adjustment mechanism and the second adjustment mechanism in time to ensure that the paper is always in a suitable tension state, thereby improving the stability and reliability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 It is a schematic diagram of the installation structure of the first support rod, the second support rod, and the first adjusting roller in Example 1 of the present application; Figure 3 is a schematic diagram of the overall structure of the first adjustment mechanism in Example 1 of the present application; Figure 4 This application Figure 3 A partial enlarged view of point c in the middle; Figure 5 This application Figure 1 A partial enlarged view of point b in the middle; Figure 6 This application Figure 1 A partial enlarged view of point a in the middle.

[0028] Explanation of the accompanying drawings: 1. frame; 11. first notch; 12. second notch; 2. first support rod; 21. first slide groove; 22. recessed portion; 3. first adjusting mechanism; 31. first sliding groove; 32. screw assembly; 33. motor; 34. first slider; 35. first connecting rod; 36. rolling pin; 4. second adjusting mechanism; 41. auxiliary module; 411. first rotating shaft; 412. first nozzle; 413. first lever; 42. automatic adjustment module; 421. second sliding groove; 422. second slider; 423. second connecting rod; 424. directional wheel; 425. guide rail; 426. weight rod; 427. rope; 428. guide block; 43. second support rod; 5. first adjusting roller; 51. connecting shaft; 52. tension sensor; 6. second adjusting roller. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 -Attached Figure 6 This application is described in further detail.

[0030] The embodiment of the present application discloses a paper adjustment device for a decorative paper printing machine. Example

[0031] Reference Figure 1 and Figure 2 A paper adjustment device for a decorative paper printing machine comprises a frame 1, two first support rods 2 rotatably connected to the frame 1, a plurality of first adjustment rollers 5 rotatably connected to the ends of the first support rods 2, a second adjustment mechanism 4 arranged at the ends of the first support rods 2, and a first adjustment mechanism 3 driving the first support rods 2 to rotate. Two first notches 11 symmetrically positioned are arranged on the side of the frame 1. One end of the two first support rods 2 is coaxially connected and rotatably connected to the frame 1, and the other end extends into the first notch 11 and can move along the first notch 11. The coaxially connected end of the first support rod 2 is higher than the other end. One side end; both ends of the first adjusting roller 5 are provided with connecting shafts 51, the first support rod 2 is sleeved on the connecting shaft 51, and a tension sensor 52 is also installed between the connecting shaft 51 and the first support rod 2, and the tension sensor 52 can monitor the change of paper tension in real time; the first adjusting mechanism 3 is arranged on the frame 1, and the output end of the first adjusting mechanism 3 drives the first support rod 2 to move, so that the first adjusting roller 5 is designed to apply different pressures to the paper, thereby realizing preliminary paper tension adjustment, and the second adjusting mechanism 4 can perform local tension adjustment on the paper when the local tension of the paper changes.

[0032] refer to Figure 3The first adjustment mechanism 3 includes a plurality of first sliding grooves 31 arranged on the inner walls on both sides of the frame 1, a first slider 34 slidably connected to the first sliding grooves 31, a motor 33 arranged on the frame 1, and a first connecting rod 35 fixedly connected to the first slider 34. Both ends of the first slider 34 are slidably connected to the first sliding grooves 31 on both sides of the frame 1. The frame 1 drives the first slider 34 to move along the first sliding groove 31 through the screw rod assembly 32. The first support rod 2 is provided with a first sliding groove 21. The end of the first connecting rod 35 is provided with a rolling pin 36, and the rolling pin 36 can move along the sliding groove. The motor 33 drives the first slider 34 to move through the screw rod assembly 32. The first slider 34 drives the first connecting rod 35 to move along the first sliding groove 21, so that the first support rod 2 can move around one end, so that the first adjusting roller 5 applies different pressures to the paper.

[0033] refer to Figure 4 The second adjustment mechanism 4 includes a plurality of second support rods 43 sleeved on the connecting shaft 51, a second adjustment roller 6 rotatably connected to the end of the second support rod 43, an auxiliary module 41 arranged on the frame 1, and an automatic adjustment module 42 capable of automatically adjusting the position of the second adjustment roller 6. The second adjustment roller 6 passes through the end of the second support rod 43. A plurality of second notches 12 are arranged on both sides of the frame 1. The end of the second adjustment roller 6 is passed through the second notch 12. The automatic adjustment module 42 is arranged on both sides of the frame 1. When the paper tension changes locally, it is not necessary to adjust the overall tension through the first adjustment roller 5. The local tension applied by the second adjustment roller 6 is adjusted through the automatic adjustment module 42. In the process of automatic adjustment of the local tension, the auxiliary module 41 assists the automatic adjustment module 42 in automatically and accurately adjusting the paper tension.

[0034] refer to Figure 5The automatic adjustment module 42 includes a second sliding groove 421 arranged on both sides of the frame 1, a second slider 422 slidably connected to the second sliding groove 421, a second connecting rod 423 slidably connected to the second slider 422, a guide rail 425 fixedly connected to the side of the frame 1, a guide block 428 slidably connected to the guide rail 425, and a heavy rod 426 suspended at one end of the guide block 428; the end of the second connecting rod 423 is rotatably connected to the end of the second adjusting roller 6, the frame 1 and the second slider 422 are both provided with a plurality of directional wheels 424, the end of the second adjusting roller 6 is connected to the guide block 428 by a rope 427, the rope 427 bypasses the directional wheel 424, and the traction direction of the rope 427 is changed by the directional wheel 424 The second adjusting roller 6 is subjected to an upward traction force, and the weight rod 426 offsets part of the gravity of the second adjusting roller 6, so that the second adjusting roller 6 applies a suitable tensioning force to the paper; the gravity of the first adjusting roller 5 is Na, the gravity of the weight rod 426 is Nb, and the tensioning force applied by the first adjusting roller 5 on the paper is Na-Nb+Nc, where Nc is the interference amount of other factors, including the gravity influence of the second support rod 43, the gravity influence of the rope 427, etc. Nc can be measured through multiple tests. The adjustment range of the second adjusting roller 6 for the paper is within Na-Nb+Nc. When it exceeds the adjustment range, the first adjustment mechanism 3 will adjust the position of the first adjusting roller 5 to keep the paper tension within a suitable range.

[0035] refer to Figure 6 The auxiliary module 41 includes a plurality of first rotating shafts 411 rotatably connected to the frame 1, and a plurality of first nozzles 412 fixedly connected to the first rotating shafts 411, the first rotating shafts 411 are arranged on both sides of the paper, the first nozzles 412 face the surface of the paper, the second support rod 43 is rotatably connected to the first lever 413, the first lever 413 penetrates the first rotating shaft 411, and a recessed portion 22 is provided on part of the first support rod 2, the recessed portion 22 is to avoid the first rotating shaft 411 and the first support rod 2 from interfering with each other; under the action of the first lever 413, the second support rod 43 moves to make the first rotating shaft 411 rotate at the same time, so that the nozzle still faces the surface of the paper; when the tension of the paper is locally adjusted, the first nozzle 412 faces the surface of the paper, when the local tension of the paper increases, increasing the airflow intensity of the nozzle can separate the paper from the second adjusting roller 6 more quickly, reducing the tension; when the local tension of the paper decreases, reducing the airflow intensity of the nozzle can make the contact between the paper and the second adjusting roller 6 closer, increasing the tension.

[0036] The tension sensors 52 installed at the end of the first support rod 2 are named a1, a2, and a3 respectively. The paper can first be divided into two large sections a1-a2 and a2-a3. The first support rod 2 is driven to rotate by the first adjustment machine to change the position of the first adjustment roller 5 so that different tensioning forces are applied to the paper, thereby adjusting the corresponding tension sensors 52a1, a2, and a3 to appropriate values. The second adjustment roller 6, under the action of the weight rod 426, enables the paper tension to be locally adjusted, so that the values ​​of the tension sensors 52a1, a2, and a3 vary within a certain range. When the variation range exceeds the preset value, the first adjustment mechanism 3 adjusts the position of the first adjustment roller 5 again.

[0037] The implementation principle of the paper adjustment device of a decorative paper printing machine in the embodiment of the present application is as follows: first, the paper is passed through the first adjustment roller 5 and the second adjustment roller 6. Under the action of the external device to reel the paper, the paper is close to the first adjustment roller 5 and the second adjustment roller 6. The tension sensor reads the initial tension of the paper. Then, the motor 33 is started to drive the first slider 34 to move along the first sliding groove 31 through the screw assembly 32. The first slider 34 drives the first connecting rod 35 to move, so that the end of the first connecting rod 35 moves in the first sliding groove 21. The first connecting rod 35 rotates around the end of the first support rod 2, so that the first adjustment roller 5 moves along the first notch 11, so that the position of the second adjustment roller 6 changes, so that the paper tension changes, and the corresponding tension sensors 52a1, a2, a3 are adjusted to appropriate values; When the paper changes in a certain way, the second adjustment mechanism 4 can automatically adjust the tension so that the paper is always in a suitable tension range; when the paper tension becomes smaller, the second adjustment roller 6 will press the paper tightly, and the paper can rotate on the first adjustment roller 5 under the action of gravity on the second adjustment roller 6, increasing the contact surface between the first adjustment roller 5 and the paper. At the same time, one side of the two sides of the paper pressurizes the airflow, and the other side reduces the airflow, so that the paper is more closely attached to the surface of the first adjustment roller 5, increasing the friction between the first adjustment roller 5 and the paper, so that the paper tension increases during transportation; When the paper tension becomes larger, the paper will lift the second adjusting roller 6 to reduce the contact area between the paper and the first adjusting roller 5. At the same time, one side of the two sides of the paper will increase the airflow, while the other side will reduce the airflow, so that the paper will be blown away from the first adjusting roller 5, reducing the friction between the first adjusting roller 5 and the paper, so that the paper tension is reduced during transportation. Moreover, the second adjusting roller 6 will relax the length of the paper between the first adjusting roller 5 and the second adjusting roller 6 during the lifting process, so that the paper tension is reduced.

[0038] When the tension change of the paper exceeds the tension that the second adjusting mechanism 4 can automatically adjust, the first adjusting mechanism 3 is started again to readjust the overall tension of the device, so that the second adjusting mechanism 4 can automatically adjust the local tension of the paper again. Example

[0039] A paper adjustment method for a decorative paper printing machine, comprising the following method: S1, firstly, the paper passes through the first adjusting roller 5 and the second adjusting roller 6. Under the action of the external device to reel the paper, the paper is closely attached to the first adjusting roller 5 and the second adjusting roller 6. At this time, the pressure sensor reads the initial tension of different parts of the paper; S2, respectively controlling the first adjustment mechanisms 3 on both sides to respectively control the corresponding first adjustment rollers 5, so as to adjust the tension of the paper on the corresponding side, thereby achieving a rough adjustment of the paper; S3, after the rough adjustment is completed, the second adjustment mechanism 4 automatically adjusts the local tension of the paper; S4. When the paper tension changes beyond the automatic adjustment range, perform coarse adjustment to adjust the paper tension on the corresponding side.

[0040] Among them, the specific method of coarse adjustment in step S2 is as follows: the motor 33 drives the first slider 34 to move along the first sliding groove 31, the first slider 34 drives the first connecting rod 35 to move together, and the end of the first connecting rod 35 moves along the first sliding groove 21. Under the action of the end of the first connecting rod 35, the first adjusting roller 5 can rotate around one end, thereby changing the position of the first adjusting roller 5, so that the first adjusting roller 5 applies different tensioning forces to the paper, thereby quickly realizing coarse adjustment of the paper.

[0041] Among them, the specific method of automatic adjustment in step S3 is as follows: the weight rod 426 offsets part of the gravity of the first adjustment roller 5, so that the second adjustment roller 6 applies a tension within a certain range to the paper. The paper tension changes within the applied tension range. The second adjustment roller 6 automatically adjusts the tension on the paper. The first nozzle 412 increases and decreases the airflow to achieve auxiliary adjustment of the paper tension.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A paper adjustment device for a decorative paper printing machine, characterized in that: The invention comprises a frame (1), a plurality of first support rods (2) rotatably connected to the frame (1), and a plurality of first adjustment rollers (5) rotatably connected to the first support rods (2), wherein one end portion of all the first support rods (2) is coaxially connected, the first adjustment roller (5) is arranged at the end portion of the first support rod (2), the frame (1) is provided with a first adjustment mechanism (3) for driving the first support rod (2) to rotate around the end portion, and the end portion of the first support rod (2) is provided with a second adjustment mechanism (4) for adjusting the local tension of paper.

2. The paper adjusting device for a decorative paper printing machine according to claim 1, characterized in that: The second adjustment mechanism (4) comprises a plurality of second support rods (43) rotatably connected to the ends of the first support rods (2), automatic adjustment modules (42) arranged on both sides of the frame (1), and an auxiliary module (41) arranged on the frame (1); the ends of one side of the second support rods (43) are coaxial with the first adjustment roller (5); the ends of the second support rods (43) are rotatably connected to the second adjustment roller (6); the paper passes through the first adjustment roller (5) and the second adjustment roller (6); the automatic adjustment module (42) can automatically adjust the tension applied by the second adjustment roller (6) to the paper according to the change of the paper tension; the auxiliary module (41) assists the automatic adjustment module (42), so that the automatic adjustment module (42) can more accurately adjust the local tension of the paper.

3. The paper adjusting device for a decorative paper printing machine according to claim 2, characterized in that: The automatic adjustment module (42) comprises a plurality of second notches (12) arranged on both sides of the frame (1), the second adjustment rod passes through the second notches (12), the second sliding grooves (421) are fixedly connected to both sides of the frame (1), the second sliding grooves (421) are slidably connected to the second sliders (422), the second sliders (422) are slidably connected to the second connecting rods (423), the second connecting rods (423) are rotatably connected to the end of the second adjustment roller (6), the frame (1) and the second sliders (422) are both provided with directional wheels (424), the side of the frame (1) is fixedly connected to a plurality of guide rails (425), the guide rails (425) are slidably connected to the guide blocks (428), one end of the guide blocks (428) is connected to the second adjustment roller (6) by a rope (427), the rope (427) changes direction through the directional wheels (424), and the other end is connected to the weight rod (426).

4. The paper adjusting device for a decorative paper printing machine according to claim 3, characterized in that: The auxiliary module (41) comprises a plurality of first rotating shafts (411) rotatably connected to the frame (1), a first nozzle (412) being mounted on the first rotating shaft (411), the first nozzle (412) facing the paper, and a second supporting rod (43) being rotatably connected to a first shifting rod (413), the first shifting rod (413) passing through the first rotating shaft (411).

5. The paper adjusting device for a decorative paper printing machine according to claim 3, characterized in that: The first adjustment mechanism (3) comprises a plurality of first sliding grooves (31) fixedly connected to both sides of the frame (1); the first sliding grooves (31) are slidably connected to first sliders (34); the first support rod (2) is provided with a first sliding groove (21); the first slider (34) is fixedly connected to a first connecting rod (35); the end of the first connecting rod (35) is movable along the first sliding groove (21); and a motor (33) is provided on the frame (1) for driving the first slider (34) to move via a screw rod assembly (32).

6. The paper adjusting device for a decorative paper printing machine according to claim 4, characterized in that: A first notch (11) is provided on the side of the frame (1); one end of the first support rod (2) is located in the first notch (11), and the other end passes through the side of the frame (1); the end of the second adjustment roller (6) is fixedly connected to a connecting shaft (51); the connecting shaft (51) passes through the end of the first support rod (2); and the second support rod (43) is sleeved on the connecting shaft (51).

7. The paper adjusting device for a decorative paper printing machine according to claim 5, characterized in that: A tension sensor (52) is provided between the connecting shaft (51) and the first support rod (2).

8. A paper adjustment method for a decorative paper printing machine, comprising the paper adjustment device for a decorative paper printing machine as claimed in claim 7, characterized in that: The following methods are included: S1, firstly, the paper is passed through the first adjusting roller (5) and the second adjusting roller (6), and under the action of the external device to reel the paper, the paper is closely attached to the first adjusting roller (5) and the second adjusting roller (6), and at this time, the pressure sensor reads the initial tension of different parts of the paper; S2, respectively controlling the first adjustment mechanisms (3) on both sides to respectively control the corresponding first adjustment rollers (5), so as to adjust the tension of the paper on the corresponding side, thereby achieving rough adjustment of the paper; S3, after the rough adjustment is completed, the second adjustment mechanism (4) automatically adjusts the local tension of the paper; S4. When the paper tension changes beyond the automatic adjustment range, perform coarse adjustment to adjust the paper tension on the corresponding side.

9. The paper adjusting device for a decorative paper printing machine according to claim 1, characterized in that: The specific method of the coarse adjustment in step S2 is as follows: the motor (33) drives the first slider (34) to move along the first sliding groove (31), the first slider (34) drives the first connecting rod (35) to move together, the end of the first connecting rod (35) moves along the first sliding groove (21), and under the action of the end of the first connecting rod (35), the first adjusting roller (5) can rotate around one end, thereby changing the position of the first adjusting roller (5), so that the first adjusting roller (5) applies different tensioning forces to the paper, thereby quickly achieving coarse adjustment of the paper.

10. The paper adjusting device for a decorative paper printing machine according to claim 1, characterized in that: The specific method of automatic adjustment in step S3 is as follows: the weight rod (426) offsets part of the gravity of the first adjustment roller (5), so that the second adjustment roller (6) applies a tension within a certain range to the paper, and the paper tension changes within the applied tension range. The second adjustment roller (6) automatically adjusts the tension on the paper, and the first nozzle (412) increases and decreases the airflow to achieve auxiliary adjustment of the paper tension; When the tension of the paper decreases, the second adjusting roller (6) will press down the paper, which, on the one hand, increases the contact area between the paper and the first adjusting roller (5), and on the other hand, increases the length of the paper between the first adjusting roller (5) and the second adjusting roller (6); When the tension of the paper increases, the second adjusting roller (6) is lifted by the paper, which reduces the contact area between the paper and the first adjusting roller (5) on the one hand, and reduces the length of the paper between the first adjusting roller (5) and the second adjusting roller (6) on the other hand.

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