Rotary printing apparatus

Abstract

The application discloses a rotary screen printing equipment, and relates to the technical field of printing equipment, which comprises a printing unit, a tension isolation assembly, a material releasing unit, a material collecting unit and a central control mechanism. The tension isolation assembly comprises a negative pressure adsorption roller arranged in front of and / or behind the printing unit along the material conveying direction. The negative pressure adsorption roller can adsorb the material around the circumferential surface by negative pressure, and can rotate to convey the material. The material releasing unit can release the material to the printing unit for printing, can monitor the tension of the material during the releasing process, and can adjust the releasing speed of the material. The material collecting unit can dry and wind the printed material, can monitor the tension of the material during the winding process, and can adjust the winding speed. The central control mechanism can obtain the tension information of the material and control the conveying speed of the material. The rotary screen printing equipment can improve the printing quality.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to a rotary screen printing device. Background Technology

[0002] Rotary screen printing, as a highly efficient continuous pattern printing technology, is widely used in textiles, wallpaper, packaging materials, and industrial decorative films. However, with the market's increasing demands for printing speed, registration accuracy, and pattern complexity, traditional rotary screen printing technology faces severe challenges. During high-speed operation, even the slightest stretching, relaxation, or lateral drift of the material can directly lead to registration errors, deformation, or wrinkles, resulting in a large number of defective products. Among these challenges, the precision and stability of material tension control have become the bottleneck restricting the improvement of overall machine performance.

[0003] The printing section cannot obtain a truly independent and ultra-stable tension environment; this directly leads to the susceptibility of rotary screen printing to interference, making it difficult for the instantaneous speed of the material at the printing point to keep absolutely synchronized with the circumference of the rotary screen, resulting in microscopic "slippage", which in turn causes the most fundamental quality defects such as misregistration and pattern deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary screen printing device to solve the problems existing in the prior art and improve printing quality.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a rotary screen printing device, including a printing unit, a tension isolation component, a feeding unit, a receiving unit, and a central control mechanism. The printing unit is used to print on the input material. The tension isolation component includes a negative pressure adsorption roller disposed in front of and / or behind the printing unit along the material conveying direction. The negative pressure adsorption roller can adsorb the material wrapped around its circumference with negative pressure, and the negative pressure adsorption roller can rotate to convey the material. The feeding unit is disposed at the beginning along the material conveying direction. The feeding unit can release material to the printing unit for printing, and the feeding unit can monitor the tension of the material during the feeding process and adjust the material release speed. The receiving unit is disposed at the end along the material conveying direction. The receiving unit can dry and rewind the printed material, and the receiving unit can monitor the tension of the material during the rewinding process and adjust the rewinding speed. The central control mechanism is communicatively connected to the printing unit, the tension isolation component, the feeding unit, and the receiving unit, and can acquire the tension information of the material and control the material conveying speed.

[0007] Preferably, the printing unit has one negative pressure adsorption roller at the front along the material conveying direction and two negative pressure adsorption rollers arranged sequentially at the rear; and a first tension monitoring element is provided at the front and / or rear of the printing unit to monitor the tension information of the material before and after printing and send it to the central control mechanism, which can adjust the conveying speed of the negative pressure adsorption rollers at the front and / or rear of the printing unit according to the tension information.

[0008] Preferably, a storage device is provided between the two negative pressure adsorption rollers behind the printing unit along the material conveying direction. The storage device includes a guide roller group and a monitoring component. Material can be wound around the circumference of the guide roller group, and the guide roller group can move up and down based on the tension and gravity of the material. The monitoring component can monitor the position information of the movement of the guide roller group and send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption rollers behind the storage device according to the position information.

[0009] Preferably, the printing unit is provided with a negative pressure adsorption roller at the front and rear along the material conveying direction, and a second tension monitoring device is provided at the rear of the negative pressure adsorption roller. The second tension monitoring device is used to monitor the tension information of the material and can send it to the central control mechanism. The central control mechanism can adjust the material conveying speed of the negative pressure adsorption roller at the rear of the printing unit and / or the receiving unit according to the tension information.

[0010] Preferably, a negative pressure adsorption roller is provided behind the printing unit along the material conveying direction, and a third tension monitoring device is provided in front of the printing unit. The third tension monitoring device is used to monitor the tension information of the material and can send it to the central control mechanism. The central control mechanism can adjust the material conveying speed of the feeding unit and / or the negative pressure adsorption roller behind the printing unit according to the tension information.

[0011] Preferably, it further includes a front and back dust removal unit, which is placed between the feeding unit and the printing unit along the conveying direction. The front and back dust removal unit can remove dust from both sides of the material passing through.

[0012] Preferably, it also includes a feeding correction unit, which is placed between the front and back dust removal unit and the printing unit along the conveying direction. The feeding correction unit can monitor the edge position of the material and adjust the edge of the material to a preset position.

[0013] Preferably, the feeding unit is further provided with a monitoring sensor, which is used to detect whether there is material on the conveying path and can feed back to the central control mechanism, which can control the operation of the feeding unit.

[0014] Preferably, the receiving unit includes a drying chamber and a take-up roller, a take-up correction device, and a fourth tension monitoring device, all disposed within the drying chamber. The take-up roller is positioned at the center of the drying chamber. Material entering the drying chamber passes through the take-up correction device and is wound onto the take-up roller. The take-up correction device can monitor the edge position of the material and adjust the material edge to a preset position under the control of the central control mechanism. The fourth tension monitoring device is positioned between the take-up correction device and the take-up roller to detect the tension information of the material. The central control mechanism can adjust the winding speed of the take-up roller based on this tension information.

[0015] Preferably, the drying chamber is provided with a loop channel. The material entering the drying chamber passes through the loop channel and the material receiving and correction device in sequence and is wound onto the winding roller. The material can be dried in the loop channel.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The rotary screen printing equipment provided by this invention releases material through a feeding unit, prints the material through a printing unit, and dries and rewinds the printed material through a receiving unit. Furthermore, by incorporating tension isolation components and negative pressure adsorption rollers positioned in front of and / or behind the printing unit, the negative pressure on the roller surface evenly adsorbs the back of the material, achieving full-width non-contact traction. This avoids the damage and uneven stress problems caused by traditional roller pressing, fundamentally eliminating scratches and deviations caused by mechanical contact. Moreover, the negative pressure adsorption rollers provide tension isolation between the upstream and / or downstream of the printing unit. To prevent tension at the inlet and outlet of the printing unit from being interfered with by upstream and downstream components, which would make it difficult for the instantaneous speed of the material at the printing point to maintain absolute synchronization with the circumference of the rotary screen, resulting in microscopic "slippage" that causes misregistration and pattern deformation, the feeding unit, printing unit, and receiving unit are modularly set up. Under the control of the central control mechanism, the material conveying speed within each module can be independently controlled. With the addition of material tension monitoring, segmented establishment, independent control, and intelligent coordination of material tension in each module segment can be achieved, thereby creating and maintaining an independent and ultra-stable tension environment for rotary screen printing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the rotary screen printing equipment provided in Embodiment 1 of the present invention;

[0020] Figure 2 This is a partial schematic diagram of the feeding unit provided in Embodiment 1 of the present invention;

[0021] Figure 3 This is a partial schematic diagram of the front and back dust removal unit provided in Embodiment 1 of the present invention;

[0022] Figure 4 This is a partial schematic diagram of the feeding correction unit provided in Embodiment 1 of the present invention;

[0023] Figure 5 This is a schematic diagram of the negative pressure adsorption roller provided in Embodiment 1 of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of a tension monitoring device provided in Embodiment 1 of the present invention;

[0025] Figure 7 This is a partial schematic diagram of the printing unit provided in Embodiment 1 of the present invention;

[0026] Figure 8 This is a partial schematic diagram of the storage device provided in Embodiment 1 of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of the rotary screen printing equipment provided in Embodiment 2 of the present invention;

[0028] Figure 10 This is a schematic diagram of the rotary screen printing equipment provided in Embodiment 3 of the present invention.

[0029] In the diagram: 1-Printing unit; 2-Material; 3-Tension isolation component; 31-Negative pressure adsorption roller; 32-Adsorption hole; 33-Cap; 34-Air connector; 35-Connecting block; 36-Bearing; 37-Negative pressure roller servo motor; 38-Friction plate; 39-Fixing plate; 4-Feeding unit; 41-Monitoring sensor; 42-Feeding servo motor; 43-Receiving platform; 44-Tension controller; 5-Receiving unit; 51-Drying box; 52-Rewinding roller; 53-Receiving correction device; 54-Fourth tension monitoring unit. Components; 55-U-shaped channel; 6-First tension monitoring component; 61-Tension sensor; 62-Floating roller; 63-Fixed shaft; 7-Store; 71-Monitoring assembly; 72-Upper limit sensor; 73-Lower limit sensor; 8-Third tension monitoring component; 9-Front and back dust removal unit; 91-First front dust removal roller; 92-Second front dust removal roller; 93-Third front dust removal roller; 94-First back dust removal roller; 95-Second back dust removal roller; 10-Feeding correction unit; 11-Transition roller; 12-Frame. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a rotary screen printing device to solve the problems existing in the prior art and improve printing quality.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] This embodiment provides a rotary screen printing device; please refer to [link / reference]. Figures 1-8 The system includes a printing unit 1, a tension isolation component 3, a feeding unit 4, a receiving unit 5, and a central control mechanism. The printing unit 1 is used to print on the input material 2. The tension isolation component 3 includes negative pressure adsorption rollers 31 arranged in front of and behind the printing unit 1 along the material 2 conveying direction. The negative pressure adsorption rollers 31 can adsorb the material 2 wrapped around the circumference with negative pressure, and the negative pressure adsorption rollers 31 can rotate to convey the material 2. The feeding unit 4 is arranged at the beginning along the material 2 conveying direction. The feeding unit 4 can release the material 2 to the printing unit 1 for printing, and the feeding unit 4 can monitor the tension of the material 2 during the feeding process and adjust the release speed of the material 2. The receiving unit 5 is arranged at the end along the material 2 conveying direction. The receiving unit 5 can dry and rewind the printed material 2, and the receiving unit 5 can monitor the tension of the material 2 during the rewinding process and adjust the rewinding speed. The central control mechanism is communicatively connected to the printing unit 1, the tension isolation component 3, the feeding unit 4, and the receiving unit 5, and can obtain the tension information of the material 2 and control the conveying speed of the material 2.

[0035] The material 2 is released by the feeding unit 4, printed by the printing unit 1, and dried and wound up by the receiving unit 5. Furthermore, by setting up the tension isolation component 3, negative pressure adsorption rollers 31 are installed in front of and behind the printing unit 1. The negative pressure on the roller surface evenly adsorbs the back of the material 2, achieving full-width non-contact traction. This avoids the damage and uneven force caused by traditional roller pressing, fundamentally eliminating scratches and deviations caused by mechanical contact. Moreover, the negative pressure adsorption rollers 31 can isolate the tension upstream and downstream of the printing unit 1, preventing the tension at the inlet and outlet of the printing unit 1 from being interfered with by upstream and downstream forces. This makes it difficult for the instantaneous speed of material 2 at the printing point to maintain absolute synchronization with the circumference of the rotary screen, resulting in microscopic "slippage" that causes misregistration and pattern deformation. Therefore, by modularizing the feeding unit 4, printing unit 1, and receiving unit 5, the conveying speed of material 2 in each module can be independently controlled by the central control mechanism. With the tension monitoring of material 2, the tension of material 2 in each module segment can be established, independently controlled, and intelligently coordinated, thereby creating and maintaining an independent and ultra-stable tension environment for rotary screen printing. It should be noted that material 2 is shown as a thin line in the figure to illustrate the equipment structure, while the actual material 2 is in the form of a surface.

[0036] In this embodiment, each component is mounted on the frame 12. To facilitate the transfer of material 2 between modules, a transition roller 11 rotatably connected to the frame 12 can be used to transfer material 2. The central control mechanism is a PLC control mechanism and is fixedly mounted on the frame 12.

[0037] In the optional embodiment, more preferably, a negative pressure adsorption roller 31 is provided in front of the printing unit 1 along the material 2 conveying direction, and two negative pressure adsorption rollers 31 are arranged sequentially behind it; and a first tension monitoring element 6 is provided in front of and behind the printing unit 1 so as to monitor the tension information of the material 2 before and after printing and send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption rollers 31 in front of and / or behind the printing unit 1 according to the tension information.

[0038] In this system, the negative pressure adsorption rollers 31 at the front and rear of the printing unit 1 together form the "tension wall" of the printing unit 1. Under the control of the central control mechanism and in conjunction with the tension monitoring of the first tension monitoring components 6 at the front and rear, the negative pressure adsorption roller 31 at the front controls the inlet tension, and the negative pressure adsorption roller 31 at the rear controls the outlet tension, thereby enveloping the printing unit 1 in an independent and controllable tension environment. This "segmented tension control" strategy allows the tension of the printing process to be adjusted quickly and accurately independently of the feeding section and the subsequent drying section, which is the key to achieving rapid color matching, stable printing, and responding to process changes. Furthermore, the negative pressure adsorption roller 31 at the inlet of the receiving unit 5 can adjust the tension and speed of the material 2 entering the receiving unit 5.

[0039] Specifically, each negative pressure adsorption roller 31 has several adsorption holes 32 distributed circumferentially and axially on its roller. Inside the roller, there are gas channels extending axially and circumferentially and connecting to the corresponding adsorption holes 32. One side of the gas channel is sealed by a cap 33, and the other end is connected to a gas connector 34 on a connecting block 35. The gas connector 34 is connected to an external vacuum device, enabling negative pressure adsorption of the material 2 by the adsorption holes 32. The negative pressure can be adjusted to achieve smooth traction and tension without mechanical contact. Furthermore, the negative pressure adsorption roller 31 is connected to a bearing 36 and a friction plate on one side... 38 is connected to the negative pressure roller servo motor 37, which is fixed by the fixing plate 39. The negative pressure roller servo motor 37 can drive the negative pressure adsorption roller 31 to rotate to realize the conveying of material 2. It solves the problems of front scratches, smudges or indentations caused by traditional pressure rollers. At the same time, it effectively eliminates the shaking and wrinkles of material 2 through strong adsorption force, providing an extremely flat and stable operating substrate for printing or coating. It should be noted that the negative pressure adsorption roller 31 can also adopt other mechanisms as needed, as long as it can realize the negative pressure adsorption and rotational conveying of material 2.

[0040] Furthermore, the first tension monitoring component 6 is the "sensing organ" and the cornerstone of precision of the tension closed-loop control system. It measures the physical tension value of the material 2 during operation in real time and accurately, and converts it into a standard electrical signal to feed back to the central control mechanism. It can dynamically adjust the unloading / rewinding torque or traction speed to counteract tension interference caused by material 2 fluctuations, speed changes, mechanical vibrations and other factors, and ultimately ensure the high stability and repeatability of tension throughout the entire process from unloading to rewinding.

[0041] Specifically, the first tension monitoring element 6 can adopt a conventional structure. According to the measurement principle, it is mainly divided into two categories: direct and indirect. Direct sensors, such as strain gauge type or micro-displacement type, directly calculate the tension by detecting the force or small displacement of the bearing seats at both ends of the guide roller. The accuracy is extremely high, reaching ±0.1%, and it is often used as the main control sensor installed at the key point of tension control. Indirect sensors, such as floating roller 62 or pendulum type, indirectly reflect the tension change by detecting the displacement angle of floating roller 62. The structure is simple and can buffer the impact. It is mostly used in occasions where the absolute accuracy requirement is slightly lower or where it is necessary to increase the storage of material 2. If the first tension monitoring element 6 is set as floating roller 62, the floating roller 62 is rotatably connected to the fixed shaft 63 through bearings, and tension sensors 61 for monitoring the position of floating roller 62 are set at both ends of the fixed shaft 63. The fixed shaft 63 can slide vertically on the frame 12 through the slide rail.

[0042] Furthermore, printing unit 1 is a rotary screen printing unit. In this unit, material 2 comes into contact with the rotating rotary screen, and ink is transferred to the surface of material 2 through the mesh. To ensure the pattern is continuous and without deformation, the speed of material 2 must be absolutely synchronized with the circumferential speed of the rotary screen at the instant it passes through the printing point, and the tension in the contact area must be constant. Therefore, negative pressure suction rollers 31 are respectively set before the inlet and after the outlet of printing unit 1, equipped with a first tension monitoring element 6 with a high response speed. The constant rotation speed driven by the rotary screen is used as the main linear speed reference, but the material 2 is not directly rigidly pulled by it. The negative pressure suction roller 31 at the inlet acts as a brake, providing stable and precise back tension to material 2 through torque control. The negative pressure suction roller 31 at the outlet acts as a puller, ensuring that material 2 leaves the printing unit while maintaining the stability of the front tension of material 2. The speed of the brushing dots is strictly synchronized with the speed of the rotary screen circumference; the first tension monitoring component 6 monitors the actual tension of the material 2 in real time, and the central control mechanism dynamically adjusts the torque or speed compensation of the inlet and outlet negative pressure adsorption rollers 31 through rapid PID calculation, thereby forming a protected "neutral area" with constant tension and absolutely synchronized speed in the contact area of ​​rotary screen printing within the printing unit 1; this design effectively isolates the influence of upstream material feeding fluctuations and downstream material receiving interference on the instant of printing in the printing unit 1. The material 2 is always in an ideal "zero slippage" state throughout the entire printing process in contact with the rotary screen, thereby ensuring the uniformity of ink transfer, the continuity of the pattern, and the accuracy of multi-color overprinting; the constant tension and uniform speed motion control of the printing unit 1 is a key technical guarantee for improving the printing quality and production efficiency of continuous patterns on textiles, wallpapers, etc.

[0043] In the optional scheme of this embodiment, more preferably, a storage device 7 is provided between the two negative pressure adsorption rollers 31 behind the printing unit 1 along the material 2 conveying direction. The storage device 7 includes a guide roller group and a monitoring component 71. The material 2 can be wrapped around the circumference of the guide roller group, and the guide roller group can move up and down based on the tension and gravity of the material 2. The monitoring component 71 can monitor the position information of the movement of the guide roller group and send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption rollers 31 behind the storage device 7 according to the position information.

[0044] Considering the inherent slight speed difference between the printing section of printing unit 1 and the subsequent drying section, the elastic stretching of material 2, slight slippage, or the expansion and contraction of material 2 after heating, the two negative pressure adsorption rollers 31 behind printing unit 1 are prone to cumulative errors in the length of material 2, leading to loose material stacking or tight material pulling. The guide roller group is set as a floating roller group, vertically sliding in the housing of storage tank 7. Material 2 is wound around the guide rail group. The monitoring component 71 is equipped with an upper limit sensor 72 and a lower limit sensor 73 to detect the position of the guide roller group, such as a linear encoder, ultrasonic or photoelectric distance sensor. When material 2 experiences a cumulative negative error due to stretching: the guide roller group will move towards the upper limit position under the action of the material 2's tension. Once the upper limit sensor 72 detects that it is close to the upper limit, the central control mechanism will immediately issue a command to briefly and slightly reduce the speed of the rear negative pressure adsorption rollers 31, allowing the material to... Material 2 is replenished, relieving the tension and simultaneously resetting the guide roller assembly. When material 2 accumulates, resulting in a cumulative positive error, the guide roller assembly moves to the lower limit position under the gravity of material 2. Once the lower limit sensor 73 detects that it is close to the lower limit, the central control mechanism instructs the rear negative pressure adsorption roller 31 to accelerate slightly for a short time, thereby accelerating the consumption of the accumulated material 2 and returning the guide roller assembly to the set middle area. This adjustment process is dynamic, continuous, and minute, and is completed quickly through the negative pressure roller servo motor 37 of the negative pressure adsorption roller 31. Through instantaneous fine-tuning of speed, the cumulative length error is absorbed and offset in real time, ensuring that material 2 is always kept in an ideal state that is neither too loose nor too tight. Thus, without stopping the machine or interfering with the main process, the cumulative error in the transmission of material 2 is actively and continuously eliminated. This is a key closed-loop control link to ensure continuous, stable, and high-quality production.

[0045] In the optional scheme of this embodiment, more preferably, the rotary screen printing equipment provided in this embodiment also includes a front and back dust removal unit 9, which is placed between the feeding unit 4 and the printing unit 1 along the conveying direction. The front and back dust removal unit 9 can remove dust from both sides of the material 2 that has passed through.

[0046] A receiving platform 43 fixed to the frame 12 is provided between the feeding unit 4 and the front and back dust removal unit 9. The front and back dust removal unit 9 includes a first front dust removal roller 91, a second front dust removal roller 92, a third front dust removal roller 93, a first back dust removal roller 94, and a second back dust removal roller 95, which are arranged sequentially along the conveying direction and rotatably connected to the frame 12. That is, the material 2 passes through three stages of front dust removal rollers, wherein the first front dust removal roller 91 and the second front dust removal roller 92 are both silicone rollers, and the third front dust removal roller 93 is a tearable film adhesive paper roll. Subsequently, the material 2 passes through... The material 2 passes through the transition roller 11 and then through the first reverse dust removal roller 94 and the second reverse dust removal roller 95. The first reverse dust removal roller 94 is a tear-off film dust removal paper roll, and the second reverse dust removal roller 95 is a silicone roller. After passing through the front and back dust removal device, the material 2 is ensured to be clean on both sides. Micron-level dust, fibers and debris are powerfully removed by physical adhesion. The multi-stage dust removal design realizes the progressive deepening of the cleaning effect and the self-cleaning function, ensuring that the surface of the material 2 entering the printing unit 1 reaches an extremely high cleanliness standard, fundamentally eliminating defects such as white spots and missing prints caused by dust.

[0047] In the optional scheme of this embodiment, more preferably, the rotary screen printing equipment provided in this embodiment also includes a feeding correction unit 10, which is placed between the front and back dust removal unit 9 and the printing unit 1 along the conveying direction. The feeding correction unit 10 can monitor the edge position of the material 2 and can adjust the edge of the material 2 to a preset position.

[0048] The feeding and correction unit 10 can adopt a conventional mechanism, which is a precision closed-loop servo control system composed of sensors, controllers and actuators. Its core function is to track the lateral position of the roll edge or printed marks in real time. When the photoelectric or ultrasonic sensor detects the deviation signal, the intelligent controller immediately performs calculations and instructs the servo motor to drive the correction frame to produce lateral sliding, thereby automatically guiding the material 2 back to the preset precise path. The system usually has two modes: edge correction and line mark correction. With its high precision of ±0.1mm and fast response capability, it plays the role of "intelligent navigation" after the feeding unit 4 and before the first processing step. It fundamentally eliminates misregistration, coating deviation and slitting errors caused by the deviation of the material 2. It is a basic positioning device to ensure that the subsequent printing and processing can operate efficiently and with high quality.

[0049] In the optional scheme of this embodiment, more preferably, the feeding unit 4 mainly consists of a roller, a feeding servo motor 42, and a tension controller 44 mounted on the frame 12. The feeding servo motor 42 drives the roller to rotate to feed the material. The feeding servo motor 42 can control the feeding torque and speed. It can be equipped with a tension monitoring device to monitor the tension of the material 2 in real time and adjust it through the tension controller 44. Under the central control of the central control mechanism, the tension controller 44 can accurately control the output torque of the feeding servo motor 42 to actively and stably establish the initial tension required by the material 2. The specific control principle is conventional, such as automatically calculating and adjusting the torque according to the real-time material roll radius for open-loop control, or combining the feedback of the tension monitoring device for dynamic fine-tuning for closed-loop control, thereby achieving high precision and adjustability of tension, ensuring the stability of the subsequent printing process from the source, avoiding stretching or wrinkling of the material 2, and effectively reducing waste, protecting sensitive material 2, and adapting to the high-speed start-up and shutdown and automated production requirements of the equipment.

[0050] In the optional scheme of this embodiment, more preferably, the feeding unit 4 is also provided with a monitoring sensor 41. The monitoring sensor 41 is used to detect whether there is material 2 on the conveying path and can feed back to the central control mechanism, which can control the action of the feeding unit 4.

[0051] Specifically, the monitoring sensor 41 can be set as a conventional material sensor such as an infrared or image sensor. When the feeding is completed, it prompts the central control mechanism to perform shutdown control or alarm reminder.

[0052] In a preferred embodiment, the receiving unit 5 includes a drying box 51 and a take-up roller 52, a take-up correction device 53, and a fourth tension monitoring element 54, all disposed within the drying box 51. The take-up roller 52 is positioned at the center of the drying box 51. The material 2 entering the drying box 51 passes through the take-up correction device 53 and is wound onto the take-up roller 52. The take-up correction device 53 can monitor the edge position of the material 2 and adjust the edge of the material 2 to a preset position under the control of the central control mechanism. The fourth tension monitoring element 54 is positioned between the take-up correction device 53 and the take-up roller 52 to detect the tension information of the material 2. The central control mechanism can adjust the winding speed of the take-up roller 52 according to the tension information.

[0053] The negative pressure adsorption roller 31, located before the inlet of the drying chamber 51, is responsible for introducing the material 2 into the complex drying path within the drying chamber 51 with stable tension, and overcoming the resistance caused by wind pressure and friction within the chamber. Between the drying outlet and the winding roller 52, a fourth tension monitoring element 54 is provided to monitor the final tension of the material 2 before winding in real time and feed the signal back to the central control mechanism to control the drive servo motor of the winding roller 52. Based on this feedback signal, a conventional tapered tension control algorithm is used to dynamically adjust the winding torque, ensuring that the material 2 maintains a constant tensile tension throughout the continuous increase in winding diameter. This not only ensures tight and neat winding, but more importantly, prevents relative sliding or scratching of multiple layers of material 2 within the drying chamber 51 due to tension fluctuations, thereby protecting the not-yet-fully-cured printed pattern. Furthermore, a material correction device 53 is provided before winding, employing a conventional mechanism to adjust the position of the material 2, as described in the aforementioned feeding correction unit 10. The specific structure of the fourth tension monitoring element 54 can be found in the first tension monitoring element 6.

[0054] In the optional scheme of this embodiment, more preferably, the drying box 51 is provided with a loop channel 55. The material 2 entering the drying box 51 passes through the loop channel 55 and the material receiving and correction device 53 in sequence and is wound onto the winding roller 52. The material 2 can be dried in the loop channel 55.

[0055] The innovative multi-layered loop channel 55 path design allows material 2 to circulate repeatedly within the drying chamber 51, greatly extending the effective drying journey and time under the action of hot air within a limited space. This design ensures efficient utilization of heat energy and full evaporation of solvents / moisture, achieving rapid drying while avoiding damage to material 2 or printed patterns due to excessively high temperature or wind speed.

[0056] More preferably, in the rotary screen printing equipment provided in this embodiment, the servo synchronization of the material 2 movement between the servo motor of the negative pressure adsorption roller 31 and the printing unit 1 ensures that when the material 2 enters each printing color group, the position of the pattern or mark on it maintains absolute dynamic consistency with the phase of the printing plate roller, thereby fundamentally guaranteeing the registration accuracy. The printing unit 1, each active roller (negative pressure adsorption roller 31), as well as the feeding unit 4 and receiving unit 5 are all driven by independent servo motors and uniformly commanded by a central control mechanism via a high-speed bus. The central control mechanism establishes a strict virtual electronic coupling relationship between the components through electronic gears or electronic cam functions, enabling the negative pressure adsorption... The speed signal of roller 31 serves as the main reference. Based on this reference and combined with the phase deviation feedback from the tension monitoring device, the servo driver of printing unit 1 adjusts its own speed and phase in real time and in minute increments to achieve precise following with the main traction. It can achieve a registration accuracy of ±0.1mm or even higher, meeting the requirements of high-end packaging and anti-counterfeiting printing. It eliminates the need for complex long shafts and gearboxes, reducing mechanical wear and maintenance costs. When changing orders, the change in the circumference of the printing roller can be quickly completed by electronic setting, eliminating the need to replace mechanical gears and significantly shortening the setup time. It can maintain excellent synchronization during equipment acceleration, deceleration, or constant speed operation, reducing start-up and shutdown waste.

[0057] Thus, the rotary screen printing equipment provided in this embodiment is specifically designed to achieve high-precision and high-cleanliness printing and drying of continuous roll materials 2 such as fabrics, films, and paper. The entire system adopts a modular design with clear logic and precise control, and can be mainly divided into four core process sections: feeding section, printing section, material 2 error compensation transition section, and drying section. Each section is organically coupled through a high-precision traction and tension control device to ensure that material 2 is in a stable and controllable state throughout the entire process.

[0058] Example 2

[0059] This embodiment provides a rotary screen printing device; please refer to [link / reference]. Figure 9 The difference between this and the rotary screen printing equipment provided in Embodiment 1 is that:

[0060] A negative pressure adsorption roller 31 is respectively provided in front of and behind the material 2 in the printing unit 1 along the conveying direction. A second tension monitoring device is provided behind the negative pressure adsorption roller 31. The second tension monitoring device is used to monitor the tension information of the material 2 and can send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption roller 31 behind the printing unit 1 and / or the receiving unit 5 on the material 2 according to the tension information.

[0061] In this embodiment, the rotary screen printing equipment eliminates the material 2 transition section consisting of the material storage device 7 and a negative pressure adsorption roller 31 in front of it, as in Embodiment 1. After printing, the material 2 is directly drawn out by a negative pressure adsorption roller 31 and immediately enters the inlet of the receiving unit 5. A second tension monitoring device with a high response speed is set near the inlet of the receiving unit 5 or between the negative pressure adsorption rollers 31. The second tension monitoring device monitors the tension of the material 2 at this key point in real time. The central control mechanism compares this tension signal with a preset target value at high speed. Once a tension deviation caused by the instantaneous speed mismatch between the printing section and the drying section is detected, and the tension deviation indicates a tendency for material to pile up or be pulled, the speed of the receiving unit 5 or the negative pressure adsorption roller 31 in front of it will be dynamically adjusted immediately to make it quickly and accurately follow the speed change of the printing section, thereby achieving direct speed synchronization based on tension feedback and eliminating accumulated errors at the electronic control level. The specific structure of the second tension monitoring device is the same as that of the first tension monitoring device 6.

[0062] Thus, this embodiment provides a rotary screen printing device with a simplified structure and reduced cost, significantly lowering equipment manufacturing costs, floor space, and installation complexity; fewer moving mechanical parts mean lower daily maintenance requirements and higher potential operational reliability; it is ideal for production lines with highly stable processes, well-matched process parameters between printing and drying sections, minimal speed differences, substrates with stable material elasticity, predictable and uniform deformation after heating, and applications seeking maximum space utilization or sensitive to equipment investment costs.

[0063] The other structures of the rotary screen printing equipment provided in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0064] Example 3

[0065] This embodiment provides a rotary screen printing device; please refer to [link / reference]. Figure 10 The difference between this and the rotary screen printing equipment provided in Example 2 is that:

[0066] A negative pressure adsorption roller 31 is provided behind the printing unit 1 along the conveying direction of the material 2, and a third tension monitoring device 8 is provided in front of the printing unit 1. The third tension monitoring device 8 is used to monitor the tension information of the material 2 and can send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the material 2 by the feeding unit 4 and / or the negative pressure adsorption roller 31 behind the printing unit 1 according to the tension information.

[0067] In this embodiment, based on the rotary screen printing equipment provided in Embodiment 2, the negative pressure adsorption roller 31 at the front of the printing unit 1 is further eliminated. After the material 2 is fed and dust is removed from both sides, its lateral position is corrected by the feeding correction unit 10, and it passes around a third tension monitoring element 8 before entering the printing unit 1. The specific structure of the third tension monitoring element 8 is the same as that of the first tension monitoring element 6. The inlet tension signal detected by the third tension monitoring element 8 is compared with the preset ideal printing tension value in real time. The resulting deviation signal is directly fed back to the feeding unit 4 to dynamically adjust the feeding torque. At the same time, the printing unit 1 and the negative pressure adsorption roller 31 still need to maintain precise servo synchronization to control the speed of the material 2 at the printing point. Therefore, the tension stability of the printing section is achieved through the synergistic effect of the remote torque adjustment of the feeding unit 4 and the speed control of the negative pressure adsorption roller 31, forming a composite control mode of "feedforward feeding + feedback sensing + printing point synchronization".

[0068] Thus, the rotary screen printing equipment provided in this embodiment has the simplest mechanical structure and the lowest cost; however, it has the most stringent requirements for control algorithms and system response: the tension stability of the entire system is highly concentrated on the adjustment performance of the feeding unit 4, requiring it to have extremely high static accuracy and dynamic response speed to cope with changes in the properties of material 2 and instantaneous interference; it also has higher requirements for low friction and uniformity of mechanical transmission components. It is suitable for scenarios where material 2 is uniform, has a stable elastic modulus, good tensile properties, and is not prone to tension fluctuations, and the production speed should not be too high to provide sufficient reaction time for the control system; the process parameters for feeding, printing, and drying have been fully optimized and have a very high degree of matching.

[0069] The other structures of the rotary screen printing equipment provided in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0070] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rotary screen printing device, characterized in that: include: A printing unit (1) is used to print on the input material (2); The tension isolation assembly (3) includes a negative pressure adsorption roller (31) disposed in front of and / or behind the printing unit (1) along the material (2) conveying direction. The negative pressure adsorption roller (31) can adsorb the material (2) wrapped around the circumferential surface under negative pressure, and the negative pressure adsorption roller (31) can rotate to convey the material (2). The feeding unit (4) is set at the beginning along the material (2) conveying direction. The feeding unit (4) can release the material (2) to the printing unit (1) for printing. The feeding unit (4) can monitor the tension of the material (2) during the feeding process and can adjust the release speed of the material (2). The receiving unit (5) is located at the end along the material (2) conveying direction. The receiving unit (5) can dry and rewind the printed material (2). The receiving unit (5) can monitor the tension of the material (2) during the rewinding process and can adjust the rewinding speed. The central control mechanism is communicatively connected to the printing unit (1), the tension isolation component (3), the feeding unit (4), and the receiving unit (5), and is able to acquire the tension information of the material (2) and control the conveying speed of the material (2); and The front and back dust removal unit (9) is placed between the feeding unit (4) and the printing unit (1) along the conveying direction. The front and back dust removal unit (9) can remove dust from both sides of the material (2) that passes through.

2. The rotary screen printing equipment according to claim 1, characterized in that: The printing unit (1) has a negative pressure adsorption roller (31) in front of it along the material (2) conveying direction, and two negative pressure adsorption rollers (31) are arranged in sequence behind it; and a first tension monitoring element (6) is arranged in front of and / or behind the printing unit (1) so as to monitor the tension information of the material (2) before and after printing and send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption rollers (31) in front of and / or behind the printing unit (1) according to the tension information.

3. The rotary screen printing equipment according to claim 2, characterized in that: The printing unit (1) is provided with a storage device (7) between the two negative pressure adsorption rollers (31) behind the material (2) in the conveying direction. The storage device (7) includes a guide roller group and a monitoring component (71). The material (2) can be wound around the circumference of the guide roller group, and the guide roller group can move up and down based on the tension and gravity of the material (2). The monitoring component (71) can monitor the position information of the movement of the guide roller group and send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption roller (31) behind the storage device (7) according to the position information.

4. The rotary screen printing equipment according to claim 1, characterized in that: The printing unit (1) is provided with a negative pressure adsorption roller (31) in front of and behind the material (2) in the conveying direction. A second tension monitoring device is provided behind the negative pressure adsorption roller (31). The second tension monitoring device is used to monitor the tension information of the material (2) and can send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the negative pressure adsorption roller (31) behind the printing unit (1) and / or the receiving unit (5) on the material (2) according to the tension information.

5. The rotary screen printing equipment according to claim 1, characterized in that: The printing unit (1) is provided with a negative pressure adsorption roller (31) behind the material (2) in the conveying direction, and a third tension monitoring device (8) is provided in front of the printing unit (1). The third tension monitoring device (8) is used to monitor the tension information of the material (2) and can send it to the central control mechanism. The central control mechanism can adjust the conveying speed of the material (2) of the feeding unit (4) and / or the negative pressure adsorption roller (31) behind the printing unit (1) according to the tension information.

6. The rotary screen printing equipment according to any one of claims 2-5, characterized in that: It also includes a feeding correction unit (10), which is placed between the front and back dust removal unit (9) and the printing unit (1) along the conveying direction. The feeding correction unit (10) can monitor the edge position of the material (2) and adjust the edge of the material (2) to a preset position.

7. The rotary screen printing equipment according to claim 1, characterized in that: The feeding unit (4) is also equipped with a monitoring sensor (41). The monitoring sensor (41) is used to detect whether there is material (2) on the conveying path and can feed back to the central control mechanism. The central control mechanism can control the action of the feeding unit (4).

8. The rotary screen printing equipment according to claim 1, characterized in that: The receiving unit (5) includes a drying box (51) and a take-up roller (52), a take-up correction device (53) and a fourth tension monitoring device (54) all installed in the drying box (51). The take-up roller (52) is placed at the center of the drying box (51). The material (2) entering the drying box (51) passes through the take-up correction device (53) and is wound onto the take-up roller (52). The take-up correction device (53) can monitor the edge position of the material (2) and can adjust the edge of the material (2) to a preset position under the control of the central control mechanism. The fourth tension monitoring element (54) is placed between the take-up correction device (53) and the take-up roller (52) to detect the tension information of the material (2). The central control mechanism can adjust the winding speed of the take-up roller (52) according to the tension information.

9. The rotary screen printing equipment according to claim 8, characterized in that: The drying box (51) is provided with a loop channel (55). The material (2) entering the drying box (51) passes through the loop channel (55) and the material receiving and correction device (53) in sequence and is wound onto the take-up roller (52). The material (2) can be dried in the loop channel (55).

Images