High-speed thin film satellite type flexographic printing device

Abstract

The invention discloses a high-speed thin film satellite type flexographic printing device, which relates to the technical field of printing equipment and comprises a satellite printing mechanism, a centralized drying oven mechanism and an unwinding and winding mechanism. According to the satellite printing mechanism, a center roller is combined with satellite roller assemblies and inter-group drying oven assemblies, wherein the satellite roller assemblies and the inter-group drying oven assemblies are distributed in the circumferential direction at intervals, and the inter-roller distance is accurately controlled through an electric and manual combined worm and gear adjusting assembly; the inter-group drying ovens and the centralized drying ovens form a multi-stage drying system, and uniform and efficient heating and waste gas pumping and discharging are achieved through a centrifugal fan, an air distribution pipe and a multi-layer air duct structure; according to the unwinding and winding mechanism, a double-station rotary table is matched with an air swelling shaft, and automatic roll changing without shutdown is achieved; and a closed scraper is adopted to reduce volatilization. The problems that traditional equipment is low in efficiency, easy to set off, inaccurate in overprinting, waste in printing ink and the like are solved, and efficient, high-quality and energy-saving continuous printing is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of printing equipment, and in particular to a high-speed thin film satellite flexographic printing device. Background Art

[0002] Satellite printing is widely used in the flexible packaging printing industry due to its high precision and high efficiency. However, in the existing technology, traditional satellite printing equipment still has several common technical problems that affect printing efficiency and quality. On the one hand, due to the limitations of the equipment structure, the unwinding and rewinding processes usually require shutdown operations, which seriously limits the efficiency of continuous production; on the other hand, the ovens between the printing units are mostly arranged in sections, and there is a large distance between them and the printing device, resulting in serious heat loss and insufficient drying efficiency. In addition, due to poor thermal insulation performance, the printed substrate cannot be dried in a timely and uniform manner. This drying lag can easily lead to a series of quality problems such as ink smearing and deviation in overprint accuracy, making it difficult to meet the production needs of modern high-speed, high-quality printing. In addition, the traditional open scraper system has the risk of serious solvent volatilization, easy ink leakage, and even accidental spillage, which not only causes waste but also affects the working environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-speed film satellite flexographic printing device, which solves the technical problems of low production efficiency, easy smudges and inaccurate overprinting of printed products, and large ink volatilization loss caused by shutdown for roll changing, low drying efficiency and ink open management in satellite film printing.

[0004] In order to solve the above problems, the technical solution provided by the present invention is:

[0005] A high-speed film satellite flexographic printing device, comprising

[0006] The satellite printing mechanism includes a central roller located in the center and satellite roller assemblies and an intergroup drying oven assembly arranged around the central roller. The satellite roller assembly includes an adjustment assembly, an anilox roller, and a plate roller. The adjustment assembly is connected to the sliding seat where the anilox roller and the plate roller are located through a worm gear structure and a lead screw for manual and rapid adjustment of position and distance.

[0007] A centralized oven mechanism, arranged behind the satellite printing mechanism, comprising an oven and an arched passing roller built into the oven, the oven being connected to a centrifugal fan and a heating box;

[0008] The unwinding mechanism and the rewinding mechanism, the unwinding mechanism includes an active turntable, a passive turntable and an unwinding and unwinding assembly arranged relatively, the two rotate coaxially and an unwinding shaft, a roller assembly 1, a rewinding and unwinding air-inflating shaft and a roller assembly 2 are sequentially arranged around the disk, the active turntable is connected to a turntable motor, the unwinding shaft is connected to an unwinding motor for controlling rotation, the rewinding and unwinding air-inflating shaft is connected to an air-inflating shaft motor for controlling rotation, the rewinding and unwinding air-inflating shaft is connected to a negative pressure device, and a sticky material is provided on the unwinding shaft. The unwinding and unwinding assembly is connected to the satellite printing mechanism through the unwinding roller mechanism, and the rewinding mechanism is connected to the centralized oven mechanism through the rewinding roller mechanism.

[0009] Efficient and continuous production: The dual-station turntable and air-inflated shaft with an independently driven unwinding shaft enable continuous switching between unwinding and rewinding processes, completely eliminating downtime caused by roll changes and significantly improving overall production efficiency.

[0010] Precise and efficient drying: A two-stage drying system consisting of an inter-group drying oven and a centralized drying oven is employed. The inter-group drying oven provides immediate, segmented initial curing of printed products, effectively preventing ink adhesion and misregistering. The centralized drying oven at the rear utilizes a centrifugal fan and arched roller structure to provide a strong, uniform airflow and concentrated heat for a final drying environment, ensuring thorough drying and excellent ink adhesion, fundamentally improving print quality.

[0011] Precise and flexible adjustment and stable ink delivery: A combination of electric and manual worm gear and lead screw adjustment allows for rapid fine-tuning of the pressure and distance between the anilox roller and the plate roller, ensuring accurate and stable printing pressure. The enclosed scraper system effectively reduces solvent evaporation and ink leakage, maintaining stable ink viscosity, saving consumables and improving the working environment, avoiding waste and dirty plates.

[0012] Automation and high reliability: The entire system realizes automation and high-precision control of unwinding, winding and traction through the independent motor drive of each unit and the negative pressure device combined with the viscous material, ensuring the stability of film tension and smooth and reliable operation.

[0013] Optionally, the adjustment assembly includes a symmetrically arranged box body and an adjustment handwheel and a worm built into the box body, the adjustment handwheel is coaxially connected to the turbine body, the turbine body and the worm are engaged, the end of the worm is provided with an end knife groove adapted to an electric screwdriver, a synchronous adjustment shaft is connected between the boxes, the synchronous adjustment shaft is coaxially connected to the worm, the turbine body is coaxially fixed to the adjustment screw, and the adjustment screw is connected to a sliding support for moving the roller.

[0014] Manual and electric dual-mode drive: A manual adjustment handwheel and a slotted endpiece compatible with an electric screwdriver provide two power input methods. Electric mode enables fast, effortless coarse adjustments or automated control, while manual mode is used for fine adjustments or emergency operations in special circumstances such as power outages, greatly enhancing the device's adjustment flexibility and reliability.

[0015] High-precision, self-locking transmission: A worm gear is used as the core transmission mechanism. This structure offers a large reduction ratio, converting the input motion of the handwheel or motor into minute, precise linear displacement of the lead screw, thereby achieving precise control of the pressure and distance between the rollers. Furthermore, the inherent reverse self-locking property of the worm gear effectively prevents displacement or loosening under printing pressure, ensuring long-term stability of the printing pressure setting.

[0016] Bilateral Synchronous Adjustment: A synchronous adjustment shaft connecting the worms on both sides ensures that when power is input from one side, the worms on both sides rotate completely synchronously, thereby driving the turbines and lead screws on both sides to move synchronously. This prevents the sliding support (and the anilox roller or plate roller mounted on it) from tilting or getting stuck during movement, ensuring roller parallelism and smooth movement, which is crucial to printing quality.

[0017] Efficient and stable force flow transmission: The entire force flow path is input from the handwheel / electric screwdriver, reduced in speed and increased in torque by the worm gear, and finally converted into a powerful linear thrust for pushing the sliding support through the lead screw. The structure is compact and rigid, and can withstand the huge inter-roller pressure during printing operations.

[0018] Optionally, an elastic limiter is provided on the synchronous adjustment shaft, and the elastic limiter includes a patterned sleeve, a compression spring and a limit stop sleeve. The patterned sleeve and the compression spring are slidingly sleeved on the synchronous adjustment shaft, and the limit stop sleeve is fixed to the synchronous adjustment shaft. The compression spring connects the patterned sleeve and the limit stop sleeve.

[0019] Overload protection and torque limiting: This structure's core function is as a mechanical torque limiter or safety clutch. When the synchronous adjustment shaft experiences torque exceeding the preset value due to uneven resistance on both sides, obstruction by foreign objects, or excessive adjustment, the elastic limiter slips, cutting off torque transmission. This effectively protects the precision worm gear system, the adjustment screw, and related connectors from damage, preventing component deformation, breakage, or motor burnout caused by overload.

[0020] Automatic reset and shock absorption: The compression spring provides continuous axial compression and automatic reset after slippage. Once the cause of the overload is eliminated (for example, an obstruction is removed), the spring pushes the patterned sleeve back into engagement with adjacent components, restoring the system to normal operation without manual reset intervention. Furthermore, the spring structure absorbs minor vibrations and shocks generated during operation, enhancing system stability.

[0021] Provide perceptible operational feedback: The slippage of the patterned sleeve is accompanied by an obvious "click" sound or change in feel, which provides the operator with clear tactile and auditory feedback, allowing him to immediately realize that the adjustment has encountered an obstacle or reached the mechanical limit, so that he can stop the operation and check to prevent blind operation from further damaging the equipment.

[0022] Maintaining bilateral synchronization accuracy: Within the normal working torque range, it acts as a rigid connection to ensure that the synchronous adjustment shaft can accurately transmit torque and maintain absolute synchronization of the worms on both sides, thereby ensuring the parallelism of the roller movement.

[0023] Optionally, the inter-group oven assembly includes a base frame, a centrifugal fan, an air duct and an inter-group oven body; the air duct includes a branch air duct, a heat collecting box and an exhaust air duct, the air outlet of the centrifugal fan is connected to the heat collecting box, and the heat collecting box is connected to the inter-group oven body through the branch air duct; the inter-group oven body is distributed around the periphery of the central roller and is spaced apart from the satellite roller assembly; one end of the exhaust air duct is respectively connected to the interior of the inter-group oven body, and the other end extends to another centrifugal fan for circulation.

[0024] Efficient and uniform directional drying: A centrifugal fan provides stable air pressure, distributing hot air through a heat collector to various air distribution ducts. Finally, the hot air is evenly blown out from the inter-group drying oven body surrounding the central roller, providing direct, concentrated, and uniform heating to the surface of the freshly printed film. This surround layout ensures efficient heat transfer, rapidly evaporating the solvent in the ink, achieving instant, segmented curing of the printed product, and effectively preventing ink smearing and overprint deviation caused by delayed drying.

[0025] Efficient exhaust gas management and heat recycling: Exhaust ducts actively extract solvent vapor-rich exhaust gas from the inter-compartment drying ovens and deliver it to the recirculating centrifugal fan, creating conditions for centralized exhaust gas treatment (such as recovery or catalytic combustion) or for recycling some of the hot air after filtration and heating. This not only reduces environmental pollution and heat waste caused by direct emissions, but also improves the thermal efficiency of the entire drying system, meeting energy-saving and environmentally friendly production requirements.

[0026] Compact Structure and Targeted Layout: The oven body and satellite roller assemblies are alternately spaced and positioned adjacent to each printing unit, achieving a compact "one print, one dry" layout. This design significantly shortens the distance between the ink dampening film and the drying unit, ensuring prompt drying of each color after printing at high speeds. This lays a solid foundation for precise registration of subsequent color groups and is key to achieving efficient, high-quality printing throughout the system.

[0027] System stability and reliability: The chassis provides a solid mechanical support for the entire inter-compartment oven system, ensuring minimal vibration and precise positioning of the fan, air duct and oven body during operation, thereby maintaining long-term stability and reliability.

[0028] Optionally, a multi-layer air duct is provided in the inter-group oven body, and the multi-layer air duct is connected to the branch air duct and the exhaust air duct through a bend pipe. An air outlet connected to the multi-layer air duct is provided on the inter-group oven body, and a rib is provided on the edge of the air outlet.

[0029] Achieve uniform airflow distribution and stable air pressure: The multi-layered air duct structure redistributes and guides the total airflow from the air distribution duct longitudinally (along the axis of the center roller) within the oven, effectively avoiding uneven air volume distribution caused by single-point air inlet. It ensures that airflow smoothly fills the entire air duct, maintaining a roughly consistent static pressure at each outlet, thereby providing uniform and stable drying air pressure across the entire width of the film, preventing uneven drying caused by excessive or insufficient air pressure in certain areas.

[0030] Improved heat exchange efficiency and thermal energy utilization: Multi-layered air ducts increase the flow path and residence time of hot air within the oven body, allowing for more complete heat exchange with the oven walls and reducing heat loss. This design also ensures that the hot air is efficiently directed to the target area, maximizing the thermal energy applied to the substrate surface and improving thermal energy utilization.

[0031] Ensuring precise and focused airflow: The ribs at the outlet edge play a crucial role in guiding and focusing the airflow. They restrict the diffusion angle of the hot air, forcing the airflow to blow vertically and concentratedly onto the film surface, forming a concentrated "curtain of air." This not only enhances the hot air's ability to penetrate the wet ink layer, improving drying efficiency, but also effectively prevents the hot air from escaping and disrupting the working environment of surrounding printing units, further saving energy.

[0032] Optionally, the roller assembly includes a hollow roller, a roller support and a turntable support. Two hollow rollers are provided and are symmetrical about the roller support. The hollow rollers extend beyond the circumferential surfaces of the active turntable and the passive turntable.

[0033] Providing a stable and reliable film threading path: Two hollow guide rollers serve as fixed guide rollers, providing a clear, smooth, and stable film transmission path from the unwinding reel to the downstream mechanism. They ensure that the film maintains the correct direction and wrap angle during reel changes and normal operation, effectively preventing the film from straying, falling off, or interfering with the turntable structure.

[0034] Ensuring smooth, interference-free roll changes: The hollow roller's design position (extending beyond the circumference of the active and passive turntables) is key to this feature. This ensures that as the turntables rotate to change stations, the large roll diameters of both fully loaded new and empty old rolls will not contact or scrape the roller assembly. This provides the necessary clearance for the turntables to rotate, thus achieving the core function of automatic roll changes without stopping the machine.

[0035] Lightweight Structure and Rigid Support: The hollow roller structure significantly reduces its rotational inertia and overall weight while ensuring sufficient bending rigidity. This makes the roller more responsive and facilitates rapid and stable tension during high-speed operation. The roller and turntable supports provide sturdy support, ensuring the two rollers maintain precise relative position under film tension, and the entire assembly is securely mounted on the turntable.

[0036] Symmetrical layout ensures force balance: The two rollers are symmetrically distributed about the roller support, so that the tension load applied by the film on the component is balanced, avoiding the generation of additional torque or eccentric load, and ensuring the smooth operation and life of the component.

[0037] Optionally, the unwinding shaft and the unwinding and rewinding air-inflating shaft are clamped between the active turntable and the passive turntable via a safety chuck.

[0038] Achieve fast switching and high-strength connections: The safety chuck acts as a quick connector, allowing the unwinding and inflation shafts to be quickly clamped between or removed from the turntables. This "clip-on" connection is far faster than traditional bolt connections and is the core prerequisite for achieving automatic reel changes without stopping the machine. It significantly reduces station changeover time and ensures production continuity.

[0039] Reliably transmit high torque and power: The safety chuck not only enables fast mechanical connection, but its internal structure (usually using high-friction material or claw structure) can efficiently and reliably transmit the huge torque generated by the turntable main drive (turntable motor, unwinding motor, and air shaft motor) to the internal unwinding shaft or air shaft, ensuring that it can provide sufficient rewinding tension or unwinding braking torque to meet the process requirements of high-speed printing.

[0040] Providing overload protection: This is the origin of the name "safety chuck," and it is also its most critical function. It typically incorporates a torque limiter or friction clutch. If an abnormality occurs during the winding or unwinding process (such as a sudden film jam or a sudden increase in tension) and the torque exceeds a preset safety value, the chuck automatically slips or disengages, cutting off power transmission. This effectively prevents damage to the motor, transmission components, and the shaft itself, protecting the entire transmission system.

[0041] Guaranteed alignment and stable operation: The safety chuck features precise positioning and centering functions, ensuring that the unwinding and inflation shafts are perfectly aligned with the turntable's rotational center during installation. This prevents severe vibration caused by eccentric shaft installation and ensures dynamic balance and stable operation of the turntable at high speeds, thereby ensuring consistent film tension.

[0042] Optionally, teeth are provided on the outer periphery of the active turntable, and the turntable motor is engaged with the active turntable via a reducer and a turntable gear.

[0043] Providing powerful and stable driving torque: The motor and reducer combination converts the turntable motor's high-speed, low-torque output into the low-speed, high-torque output required to drive the massive turntable. This massive torque is sufficient to overcome the turntable system's massive moment of inertia and the inertia of its load (heavy webs), ensuring smooth start-up, rotation, and precise stopping of the turntable.

[0044] Achieve precise angular displacement control and indexing positioning: Gear meshing transmission features extremely high transmission rigidity and zero slip, with a fixed and precise transmission ratio. This enables the control system to precisely control the turntable's rotation angle by controlling the motor's rotation angle. This is crucial for dual-station turntable systems, ensuring that after each turntable rotation, the new station (such as a fully loaded roll) is accurately positioned at the working position, enabling accurate docking with subsequent mechanisms and ensuring reliability and repeatability of the roll-changing process.

[0045] Strong load-bearing capacity, smooth and reliable operation: The active turntable structure with outer ring teeth is rigid and strong enough to withstand significant radial loads (such as the weight of the roll and film tension) and drive torque. Compared to belt or chain transmission, the gear drive is more adaptable to heavy loads and frequent start-stop conditions, with reduced vibration, smoother transmission, and longer life, ensuring long-term operational reliability.

[0046] Ensure strict motion synchronization: The active turntable is directly linked to the motor side through gears, eliminating the elastic slip and delay that may exist in flexible transmission (such as belts), ensuring instant and synchronous response between turntable rotation and motor commands. This is very important for automated processes that require coordinated control with the printing host.

[0047] Optionally, a closed scraper is attached to the surface of the anilox roller, and the closed scraper includes a scraper holder, a scraper box, a blade and an ink pipeline. The scraper holder is fixed to the back of the scraper box, and an opening is provided on the front of the scraper box. Blades are provided on the upper and lower edges of the opening. The blades are arranged facing each other and tilted toward the direction of the anilox roller. An ink receiving tray is provided under the scraper box.

[0048] A sealed environment significantly reduces evaporation and waste: The doctor blade box and two opposing, angled blades together form a nearly completely enclosed chamber, isolating the anilox roller's inking area from the outside world. This significantly reduces the evaporation rate of organic solvents, saving ink costs while maintaining stable ink viscosity and performance. It also improves the working environment and reduces the impact of harmful gases on operators.

[0049] Stable and uniform ink supply and recovery: A dedicated ink pipeline continuously injects fresh ink into the sealed scraper box, ensuring that the anilox roller's inking holes always receive a sufficient and stable supply. Furthermore, an ink tray at the bottom of the scraper box collects excess ink that may leak or waste ink from cleaning, facilitating recycling or centralized processing. This avoids contamination and waste caused by dripping ink and achieves systematic ink management.

[0050] Precise Squeegeeing and Sealing: Two opposing blades are angled to precisely conform to the anilox roller surface. The blade on the ink outlet side (usually the one closest to the back) performs the primary scraping function, removing excess ink from the roller surface and retaining only the ink within the cells, thereby precisely controlling the amount of ink applied. The other blade assists in sealing and, working in conjunction with the main scraper, creates an "ink reservoir" within the cavity to ensure the anilox roller's cells are fully filled.

[0051] Improved safety and reliability: The fully enclosed structure fundamentally avoids the risk of ink being "splashed" by traditional open scraping systems due to ink splashing, foreign objects falling, or careless operation, greatly improving the reliability and cleanliness of operations.

[0052] Optionally, the centralized oven mechanism is placed on top of the satellite printing mechanism and the unwinding mechanism and the rewinding mechanism through a top frame. The satellite printing mechanism and the unwinding mechanism and the rewinding mechanism form a compact structure in parallel, and the printing material processing path is a loop structure.

[0053] Extreme space optimization significantly reduces floor space: By arranging the satellite printing mechanism in parallel with the unwinding and rewinding mechanisms, and placing the centralized drying mechanism high atop them, an efficient three-dimensional spatial layout ("compact structure") is created. This breaks the convention of traditional equipment expansion, consolidating production lines that once required a large floor space within a very small footprint, significantly saving factory space and reducing land and construction costs.

[0054] Physically isolate thermal management from printing operations: The centralized oven, the primary heat source, is placed at the top. Utilizing the natural rise of hot air, this effectively prevents direct impact of high-temperature hot air on the precision printing units below (such as the plate roller and anilox roller) and the motor drive unit. This not only prevents deformation or precision deviation of precision components due to heat exposure, thus ensuring print quality, but also improves the working environment for operators below.

[0055] Optimizing the process flow to create an efficient closed-loop path: The material processing path utilizes a "loop structure," meaning the film's path from unwinding, through printing, drying, and finally rewinding is continuous and non-redundant. This design significantly reduces unnecessary film travel within the equipment and reduces the number of guide rollers, thereby minimizing friction and static electricity between the film and the rollers. It also facilitates rapid and stable tension control, paving the way for high-speed operation.

[0056] Easy operation and maintenance: The compact parallel layout concentrates all main operating surfaces (unwinding and rewinding, printing unit) in one area, making it easier for operators to perform film threading, plate changing, debugging and daily maintenance, reducing the distance people move between equipment and improving ergonomic efficiency.

[0057] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0058] The technical solution provided by this invention significantly improves production efficiency through automatic roll changing without stopping the machine. A multi-stage coordinated drying system (inter-unit drying oven + centralized drying oven) ensures instant and even drying of the ink, effectively eliminating smearing and overprint deviation, significantly improving print quality. The enclosed doctor blade system reduces solvent evaporation and ink waste, achieving environmental protection and energy conservation. The three-dimensional compact layout significantly reduces the equipment footprint. Ultimately, this achieves efficient, high-quality, stable, and energy-saving satellite printing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 An overall side view of a high-speed thin film satellite flexographic printing device proposed in an embodiment of the present invention;

[0060] Figure 2 A schematic diagram of the overall structure of a satellite printing mechanism of a high-speed thin-film satellite flexographic printing device proposed in an embodiment of the present invention;

[0061] Figure 3 A schematic diagram of the detailed structure of a satellite printing mechanism of a high-speed thin-film satellite flexographic printing device proposed in an embodiment of the present invention;

[0062] Figure 4A partial view of a satellite roller assembly of a high-speed film satellite flexographic printing device according to an embodiment of the present invention;

[0063] Figure 5 An overall cross-sectional view of a satellite printing mechanism of a high-speed thin-film satellite flexographic printing device proposed in an embodiment of the present invention;

[0064] Figure 6 A first perspective view of an unwinding mechanism of a high-speed film satellite flexographic printing device proposed in an embodiment of the present invention;

[0065] Figure 7 A second perspective of the unwinding mechanism of a high-speed film satellite flexographic printing device proposed in an embodiment of the present invention;

[0066] Figure 8 A side view of an unwinding mechanism of a high-speed film satellite flexographic printing device according to an embodiment of the present invention;

[0067] Figure 9 A side view of a winding mechanism of a high-speed film satellite flexographic printing device according to an embodiment of the present invention;

[0068] Figure 10 A cross-sectional view of a closed scraper of a high-speed thin film satellite flexographic printing device according to an embodiment of the present invention;

[0069] 1. Satellite printing mechanism; 11. Printing chassis; 12. Satellite roller assembly; 121. Adjustment assembly; 122. Small sliding seat; 123. Satellite roller support; 124. Large sliding seat; 125. Anilox roller; 126. Plate roller; 13. Adjustment assembly; 14. Inter-block oven assembly; 141. Inter-block oven body; 142. Air distribution duct; 143. Heat collecting box; 144. Centrifugal fan; 145. Exhaust air duct; 15. Center roller; 2. Unwinding mechanism; 21. Active turntable; 22. Passive turntable; 23. Roller assembly 1; 231. Hollow roller; 232. Roller support; 233. Turntable support; 24. Roller assembly 2; 25. Unwinding shaft; 251. Safety chuck; 26. Unwinding and rewinding air-expansion shaft; 27. Turntable motor; 271. Turntable gear; 28. Unwinding motor; 281. Unwinding gear; 29. ​​Air-expansion shaft motor; 291. Air-expansion shaft gear; 230. Unwinding and reeling assembly; 3. Rewinding mechanism; 31. Rewinding and reeling assembly; 4. Centralized oven mechanism; 5. Top frame; 6. Unwinding roller mechanism; 7. Rewinding roller mechanism; 8. Closed scraper; 81. Scraper holder; 82. Scraper box; 83. Blade; 84. Ink pipeline; 85. Ink receiving tray. DETAILED DESCRIPTION

[0070] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0071] Example 1

[0072] Combined with attachment Figure 1 , a high-speed film satellite flexographic printing device, comprising

[0073] Combined with attachment Figure 2 The satellite printing mechanism 1 includes a central roller 15 located in the center and satellite roller assemblies 12 and an inter-group oven assembly 14 arranged at intervals around the central roller 15. The satellite roller assembly 12 includes an adjustment assembly 13, an anilox roller 125 and a plate roller 126. The adjustment assembly 13 is connected to the sliding seat where the anilox roller 125 and the plate roller 126 are located through a worm gear structure and a lead screw for manual and quick adjustment of the position and distance; the sliding seat is divided into a small sliding seat 122 and a large sliding seat 124. The large sliding seat 124 is slidably connected to the satellite roller support 123, and the small sliding seat 122 is slidably connected to the large sliding seat 124. The small sliding seat 122 is connected to and controls the position of the anilox roller 125, and the large sliding seat 124 is connected to and controls the position of the plate roller 126.

[0074] Combined with attachment Figure 2 The centralized oven mechanism 4 is arranged behind the satellite printing mechanism 1, and includes an oven and an arched passing roller built into the oven. The oven is connected to a centrifugal fan 144 and a heating box;

[0075] Combined with attachment Figure 6 、 7 The unwinding mechanism 2 and the rewinding mechanism 3 are shown. The unwinding mechanism 2 includes an active turntable 21, a passive turntable 22, and an unwinding and discharging assembly 230, which are arranged opposite each other. The two turntables rotate coaxially and are surrounded by an unwinding shaft 25, a first roller assembly 23, an air-expansion shaft 26 for rewinding and unwinding, and a second roller assembly 24. The active turntable 21 is connected to a turntable motor 27. The unwinding shaft 25 is connected to an unwinding motor 28 for controlling rotation. The air-expansion shaft 26 for rewinding and unwinding is connected to an air-expansion shaft motor 29 for controlling rotation. The air-expansion shaft 26 for rewinding and unwinding is connected to a negative pressure device. The roll on the unwinding shaft 25 is provided with a viscous material. The unwinding and discharging assembly 230 is connected to the satellite printing mechanism 1 via the unwinding roller mechanism 6. The rewinding mechanism 3 is connected to the centralized oven mechanism 4 via the rewinding assembly 31 and the rewinding roller mechanism 7. The structure of the rewinding mechanism 3 is similar to that of the unwinding mechanism 2. The air shaft motor 29 drives the retracting and unreeling air shaft 26 to rotate through the pulley and the air shaft gear 291 .

[0076] Unwinding and Rewinding Process: During unwinding, the active turntable 21 and the passive turntable 22 rotate synchronously. The currently used unwinding reel is secured by an air-inflated shaft, which releases the film. When the reel is about to run out, the system controls the unwinding motor 28 to rotate the unwinding shaft 25 via a pulley and unwinding gear 281, using the adhesive material on the reel to adhere to the film head, while a negative pressure device assists in positioning. The air-inflated shaft then vents and releases the finished reel. The motor-driven turntable rotates, precisely switching the fully loaded reel (on the unwinding shaft 25) to the working position. The air-inflated shaft is then inflated and secured again, allowing for continuous material transfer without stopping the machine. Rewinding mechanism 3 operates similarly, with the printed film being rewound onto the rewinding shaft at the rewinding station.

[0077] Printing and Drying Process: After being unwound from the unwinding mechanism 2, the film enters the satellite printing mechanism 1. The film runs against the center roller 15 and passes sequentially through the satellite roller assemblies 12 (anilox roller 125, plate roller 126) to complete the printing of each color. After each color is printed, the film immediately enters the adjacent inter-group drying oven for preliminary drying with hot air to initially fix the ink and prevent smearing and misregistration. After all color groups are printed, the film enters the centralized drying oven 4, where it is fully exposed to the strong hot air environment guided by the arched rollers for final curing, ensuring complete drying of the ink.

[0078] Adjustment and Control: The operator can make fine manual adjustments using the handwheel of the adjustment assembly 13, or use the motorized mode for rapid coarse adjustments. The worm gear drives the lead screw, precisely controlling the spacing and pressure between the anilox roller 125 and the plate roller 126 on the sliding seat to achieve optimal printing pressure. The entire system, through the coordinated operation of various motors and sensors, maintains constant film tension and continuous, stable operation.

[0079] Combined with attachment Figure 4 The adjustment component 13 includes a symmetrically arranged box body and an adjustment handwheel and a worm built into the box body. The adjustment handwheel is coaxially connected to the turbine body, the turbine body and the worm are engaged, and the end of the worm is provided with an end knife groove adapted to the electric screwdriver. A synchronous adjustment shaft is connected between the boxes, the synchronous adjustment shaft is coaxially connected to the worm, the turbine body is coaxially fixed to the adjustment screw, and the adjustment screw is connected to the sliding support for moving the roller.

[0080] Manual Mode: The operator rotates the adjustment handwheel on either side, which rotates the coaxial worm gear. Because the worm gear and worm gear are meshed, the rotation of the worm gear drives the worm gear around its axis. The worm gear's rotation is transmitted to the other worm gear via the synchronous adjustment shaft, achieving synchronized rotation of both worm gears. The worm gear's rotation further drives the meshing worm gear, which in turn rotates the coaxially fixed adjustment screw. The rotational motion of the adjustment screw is converted into linear motion of the attached sliding support via a threaded pair, thereby precisely adjusting the position of the anilox roller 125 or plate roller 126 mounted on the sliding support.

[0081] In electric mode, the operator inserts an electric screwdriver into the slot at the end of the worm. Once the electric screwdriver is activated, it directly drives the worm. The subsequent transmission path is identical to that in manual mode: the worm drives the worm gear, which in turn rotates the lead screw, which in turn drives the sliding support in a linear motion. Electric mode provides faster adjustment capabilities.

[0082] An elastic limiter is provided on the synchronous adjustment shaft, which includes a patterned sleeve, a compression spring and a limit stop sleeve. The patterned sleeve and the compression spring are slidingly sleeved on the synchronous adjustment shaft, the limit stop sleeve is fixed to the synchronous adjustment shaft, and the compression spring connects the patterned sleeve and the limit stop sleeve.

[0083] Normal operation (torque within the preset range): The compression spring is compressed, generating a strong axial thrust that presses the tread sleeve tightly against the adjacent fixed component (not specified in the figure, usually the housing wall or a component fixed to the housing). This pressure creates a significant static friction between the end pattern of the tread sleeve and the end pattern of the adjacent component. When the synchronous adjustment shaft needs to transmit torque, this static friction prevents relative sliding between the tread sleeve and the adjacent component, allowing the torque to be smoothly transmitted to the synchronous adjustment shaft through the tread sleeve, compression spring, and limit stop sleeve, allowing the entire component to rotate as a rigid unit.

[0084] Overload protection state (torque exceeds preset value): When the system encounters an obstacle, causing the torque to increase sharply and exceed the preset limit, the static friction torque between the tread sleeve and the adjacent contact surface is overcome. At this point, the strong torque forces the end pattern of the tread sleeve to overcome the spring pressure, causing it to slide (slip) along the end pattern of the adjacent component. During this process, the compression spring is further compressed or released, absorbing energy. The input rotation of the synchronous adjustment shaft can no longer be transmitted to the output end, thereby interrupting power transmission and protecting the downstream transmission mechanism. The vibration and sound generated by the slipping serve as the overload alarm signal. Once the cause of the overload is eliminated, the thrust of the compression spring will press the tread sleeve back into place, resuming power transmission.

[0085] Combined with attachment Figure 2 The inter-group oven assembly 14 includes a base frame, a centrifugal fan 144, an air duct and an inter-group oven body 141; the air duct includes a branch air duct 142, a heat collecting box 143 and an exhaust air duct 145, the air outlet of the centrifugal fan 144 is connected to the heat collecting box 143, and the heat collecting box 143 is connected to the inter-group oven body 141 through the branch air duct 142; the inter-group oven body 141 is distributed around the periphery of the central roller 15 and the satellite roller assembly 12 at intervals; one end of the exhaust air duct 145 is respectively connected to the interior of the inter-group oven body 141, and the other end extends to another centrifugal fan 144 for circulation.

[0086] Air supply and heating process: The centrifugal fan 144 serves as the heart of the system, sucking in air (or part of the circulating air) from the outside and pressing it out. The high-speed airflow is transported to the heat collecting box 143 (which is usually equipped with a heating device, such as an electric heating tube), where it is heated to the set working temperature. The heat collecting box 143 acts as a pressure stabilizing and distribution chamber, evenly diverting the hot air to each branch air pipe 142. The branch air pipe 142 guides the hot air to the corresponding inter-group oven body 141. The air nozzle or opening on the oven body blows the hot air at a specific angle and speed to the surface of the printing material running close to the center roller 15, and uses the convection impact of the hot air to quickly evaporate the solvent in the ink layer to complete the drying.

[0087] Waste gas extraction and circulation process: The solvent vapor volatilized during the drying process will accumulate in the internal space of the inter-group oven body 141. If it is not removed in time, it will reach saturation and affect the subsequent drying efficiency. At this time, the exhaust air duct 145 connected to the oven body starts to work, and uses the suction force of another centrifugal fan 144 to continuously extract the solvent-rich and high-humidity exhaust gas from the oven. The extracted exhaust gas is sent to the treatment system, which realizes the timely removal of exhaust gas in the working area and creates conditions for continuous and efficient drying. This set of "air supply-drying-extraction" closed-loop air duct management jointly ensures the efficiency and stability of the drying process.

[0088] The inter-group oven body 141 is provided with multi-layer air ducts, which are connected to the air distribution pipe 142 and the exhaust air duct 145 through bends. The inter-group oven body 141 is provided with an air outlet connected to the multi-layer air duct, and a rib is provided on the edge of the air outlet.

[0089] Airflow distribution: Hot air from the air distribution duct 142 enters the multi-layer air duct entrance of the inter-chamber oven body 141 through the elbow. The multi-layer air duct is essentially a complex internally designed flow channel chamber. Its internal structure (such as the baffles and the specific chamber layout) slows down and disperses the high-speed inflow of hot air, establishing a uniform and stable pressure field throughout the duct space. Driven by this uniform pressure field, the airflow flows evenly to each outlet connected to the duct.

[0090] Airflow Deflection and Action Process: When the airflow reaches the outlet, its velocity increases due to the sudden decrease in cross-section. At this point, the edge guard structure at the outlet plays a crucial guiding and restraining role, eliminating eddies and turbulence at the outlet edge. This allows the accelerated hot air to form a concentrated, highly directional laminar flow or a highly directional jet, precisely impacting the surface of the running film. After the heat exchange, the exhaust gas and solvent vapor are effectively extracted from the oven under the negative pressure created by the exhaust duct 145 and enter the next cycle.

[0091] Roller assembly 1 23 includes a hollow roller 231, a roller support 232, and a turntable support 233. Two hollow rollers 231 are provided, symmetrically about the roller support 232. The hollow rollers 231 extend beyond the circumferences of the active turntable 21 and the passive turntable 22. Roller assembly 2 24 has the same structure as roller assembly 1 23. The hollow rollers 231, roller support 232, and turntable support 233 are fixedly attached between the active turntable 21 and the passive turntable 22 via mounting brackets.

[0092] Film Guidance: During normal operation, after the film is unwound from the unwinding reel, it passes sequentially around the two hollow rollers 231 before being directed to the subsequent roller assembly 24 and the printing machine. These two rollers, with their smooth cylindrical surfaces, redirect the film and, in conjunction with other rollers, form the desired film path. They rotate freely, guiding the film forward with minimal friction.

[0093] The core operating principle of the rotating disc avoidance mechanism is embodied in the reel-changing process. When a reel change is required, the turntable motor 27 drives the active and passive turntables 22, along with the entire unwinding mechanism 2 mounted thereon (including the reel, air shaft, and roller assembly 23), to rotate simultaneously. Because the two hollow rollers 231 are mounted on the turntable support 233, they rotate with the turntable. Their placement "beyond the turntable's circumference" ensures that as they rotate with the turntable, their trajectory (i.e., rotational path) perfectly avoids the rotating, large-diameter reel (whether it's an existing reel being unwound or a new reel waiting to be worked on). This ensures that during the dynamic process of the turntable rotating to switch positions, no mechanical collision occurs between the moving reel and the moving rollers, achieving seamless handover.

[0094] The unwinding shaft 25 and the rewinding and unwinding air-inflating shaft 26 are clamped between the active turntable 21 and the passive turntable 22 through a safety chuck 251 .

[0095] Clamping and Power Transmission Process: To install a shaft, the operator inserts the end of the unwinding shaft 25 or the pneumatic shaft into the slot of the safety chuck 251. Pneumatically, hydraulically, or manually (depending on the chuck type), the locking mechanism within the chuck (such as the friction plate pack, clamp, or claw) contracts, firmly gripping the shaft end and achieving a rigid connection between the shaft and the turntable. At this point, the rotational motion of the active turntable 21 or the passive turntable 22 is directly transmitted to the shaft within through the safety chuck 251, driving its rotation.

[0096] Overload protection process: During normal operation, the transmitted torque is less than the chuck's preset safety torque, and the friction torque provided by the locking mechanism is sufficient to drive the shaft to rotate synchronously. If the system overloads and the torque exceeds the safety value, the force acting on the friction pair within the chuck overcomes the compression provided by the spring or cylinder, causing relative slip between the friction plates (for friction clutches) or triggering the mechanical structure to disengage (for dog clutches). This slipping or disengagement immediately interrupts torque transmission, thereby protecting the downstream drive motor and upstream mechanical transmission components. Once the overload is eliminated, a manual or automatic reset is usually required to restore the chuck's power transmission function.

[0097] The outer periphery of the driving turntable 21 is provided with teeth, and the turntable motor 27 is engaged with the driving turntable 21 through a speed reducer and a turntable gear 271 .

[0098] Power Transmission and Speed ​​Reduction: When the system issues a roll-change command, the turntable motor 27 starts. The motor's rotational motion is first transmitted to the connected speed reducer. Within the speed reducer, the meshing action of a gear set (such as a planetary gear or worm gear) significantly reduces the high input speed to a fixed speed reduction ratio, while simultaneously amplifying the output torque proportionally.

[0099] Final Drive and Motion Conversion: The low-speed, high-torque motion amplified by the speed reducer is transmitted to the turntable gear 271 via the output shaft. This gear meshes with the ring gear machined onto the outer circumference of the active turntable 21. Therefore, when the turntable gear 271 rotates, the meshing action of the rack and pinion (here, visually represented as the external meshing of a large-diameter gear and a small one) precisely converts the gear's rotational motion into rotational motion of the active turntable 21 about its own axis. This, in turn, drives the entire turntable mechanism (including all components, including the passive turntable 22, the material roll, and the feed rollers) to rotate, completing the workstation switching process.

[0100] The surface of the anilox roller 125 is fitted with a closed scraper 8, which includes a scraper holder 81, a scraper box 82, a blade 83, and an ink line 84. The scraper holder 81 is fixed to the back of the scraper box 82. The front of the scraper box 82 has an opening, and the upper and lower edges of the opening are provided with blades 83. The blades 83 are arranged facing each other and tilted toward the anilox roller 125. An ink receiving tray 85 is provided below the scraper box 82. The ink in the ink receiving tray 85 is returned to the ink barrel for recycling.

[0101] Ink Circulation and Chamber Formation: Ink is pumped into the scraper box 82 through ink line 84. A blade 83 is mounted on each of the upper and lower edges of the front opening of the scraper box 82. These blades 83 adhere closely to the surface of the high-speed rotating anilox roller 125 at a specific angle (usually opposite to the direction of rotation of the anilox roller 125). Together, these blades 83, the surface of the anilox roller 125, and the scraper box 82 form a dynamic, sealed ink reservoir.

[0102] Ink Scraping and Sealing Process: The anilox roller 125 continuously rotates and immerses itself in the ink reservoir, ensuring that the cells on its surface are fully filled with ink. As the anilox roller 125, carrying ink, exits the chamber, it first passes over the rear blade 83 (metering blade 83). This blade 83 scrapes away any excess ink (i.e., ink outside the cells) from the anilox roller 125, returning it to the ink chamber and ensuring that only the precise volume of ink within the cells is transferred to the plate roller 126. The front blade 83 (sealing blade 83) seals the other end of the chamber, helping to maintain the ink level within the chamber and prevent ink leakage from the inlet. Together with the rear blade 83, this blade maintains the chamber's seal. Any ink that may seep from the joint is collected by the ink tray 85 below, ensuring a clean system.

[0103] The centralized oven mechanism 4 is placed on top of the satellite printing mechanism 1, the unwinding mechanism 2 and the rewinding mechanism 3 through the top frame 5. The satellite printing mechanism 1, the unwinding mechanism 2 and the rewinding mechanism 3 are arranged in parallel to form a compact structure, and the printing material processing path is a loop structure.

[0104] Spatial Zoning and Thermal Management Principles: The design vertically divides equipment functions into two distinct levels. The bottom level, the "normal temperature operation zone," houses all temperature-sensitive mechanical transmission units (motors, gears), precision printing units (satellite roller assembly 12), and the unwinding and rewinding units, which require frequent manual intervention. The top level, the "high-temperature drying zone," houses the high-temperature centralized ovens and their fan systems. This zoning utilizes height differences to achieve natural physical isolation. Heat radiation and hot air circulation from the top ovens primarily impact the space above. Exhaust gases are discharged through a forced exhaust system, minimizing impact on the lower working areas and ensuring stable operation of the underlying mechanisms.

[0105] Loop Path and Material Flow Principle: The film's "loop" path is the core of the system's operation. After exiting the parallel unwinding mechanism 2, the film enters the similarly parallel satellite printing mechanism 1, where multi-color printing and inter-group drying are sequentially completed. Subsequently, the film's path does not continue horizontally. Instead, it is guided upward by a guide roller mechanism to enter the centralized drying oven at the top for final drying. After drying, the film is guided downward from the other end of the drying oven and returned to the winding mechanism 3 at the bottom for completion. This horizontal, upward, horizontal, and downward path forms a three-dimensional, end-to-end "loop." This path is not only compact, but also cleverly arranged to allow the film to enter the main drying process immediately after printing and then be wound up immediately after drying, resulting in a seamless process with the shortest path and the highest efficiency.

[0106] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A high-speed film satellite flexographic printing device, characterized in that: include The satellite printing mechanism includes a central roller located in the center and satellite roller assemblies and an intergroup drying oven assembly arranged around the central roller. The satellite roller assembly includes an adjustment assembly, an anilox roller, and a plate roller. The adjustment assembly is connected to the sliding seat where the anilox roller and the plate roller are located through a worm gear structure and a lead screw for manual and rapid adjustment of position and distance. A centralized oven mechanism, arranged behind the satellite printing mechanism, comprising an oven and an arched passing roller built into the oven, the oven being connected to a centrifugal fan and a heating box; The unwinding mechanism and the rewinding mechanism, the unwinding mechanism includes an active turntable, a passive turntable and an unwinding and unwinding assembly arranged relatively, the two rotate coaxially and an unwinding shaft, a roller assembly 1, a rewinding and unwinding air-inflating shaft and a roller assembly 2 are sequentially arranged around the disk, the active turntable is connected to a turntable motor, the unwinding shaft is connected to an unwinding motor for controlling rotation, the rewinding and unwinding air-inflating shaft is connected to an air-inflating shaft motor for controlling rotation, the rewinding and unwinding air-inflating shaft is connected to a negative pressure device, and a sticky material is provided on the unwinding shaft. The unwinding and unwinding assembly is connected to the satellite printing mechanism through the unwinding roller mechanism, and the rewinding mechanism is connected to the centralized oven mechanism through the rewinding roller mechanism.

2. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: The adjustment assembly includes a symmetrically arranged box body and an adjustment handwheel and a worm built into the box body, the adjustment handwheel is coaxially connected to the turbine body, the turbine body and the worm are engaged, the end of the worm is provided with an end knife groove adapted to an electric screwdriver, a synchronous adjustment shaft is connected between the boxes, the synchronous adjustment shaft is coaxially connected to the worm, the turbine body is coaxially fixed to the adjustment screw, and the adjustment screw is connected to a sliding support for moving the roller.

3. The high-speed film satellite flexographic printing device according to claim 2, characterized in that: An elastic limiter is provided on the synchronous adjustment shaft, and the elastic limiter includes a patterned sleeve, a compression spring and a limit stop sleeve. The patterned sleeve and the compression spring are slidingly sleeved on the synchronous adjustment shaft, and the limit stop sleeve is fixed to the synchronous adjustment shaft. The compression spring connects the patterned sleeve and the limit stop sleeve.

4. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: The inter-group oven assembly includes a base frame, a centrifugal fan, an air duct and an inter-group oven body; the air duct includes a branch air duct, a heat collecting box and an exhaust air duct, the air outlet of the centrifugal fan is connected to the heat collecting box, and the heat collecting box is connected to the inter-group oven body through the branch air duct; the inter-group oven body is distributed around the periphery of the central roller and is spaced apart from the satellite roller assembly; one end of the exhaust air duct is respectively connected to the interior of the inter-group oven body, and the other end extends to another centrifugal fan for circulation.

5. The high-speed film satellite flexographic printing device according to claim 4, characterized in that: The inter-group oven body is provided with a multi-layer air duct, which is connected to the air distribution pipe and the exhaust air duct through a bend pipe. The inter-group oven body is provided with an air outlet connected to the multi-layer air duct, and the edge of the air outlet is provided with a rib.

6. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: The first roller assembly includes a hollow roller, a roller support and a turntable support. Two hollow rollers are provided and are symmetrical about the roller support. The hollow rollers extend beyond the circumferential surfaces of the active turntable and the passive turntable.

7. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: The unwinding shaft and the unwinding and rewinding air-expanding shaft are clamped between the active turntable and the passive turntable through a safety chuck.

8. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: The outer periphery of the active turntable is provided with teeth, and the turntable motor is engaged with the active turntable through a reducer and a turntable gear.

9. The high-speed film satellite flexographic printing device according to claim 1, characterized in that: A closed scraper is attached to the surface of the anilox roller, and the closed scraper includes a scraper holder, a scraper box, a blade and an ink pipeline. The scraper holder is fixed to the back of the scraper box, and an opening is provided on the front of the scraper box. Blades are provided on the upper and lower edges of the opening. The blades are arranged facing each other and tilted toward the anilox roller. An ink receiving tray is provided below the scraper box.

10. A high-speed film satellite flexographic printing device according to any one of claims 1 to 9, characterized in that: The centralized oven mechanism is placed on top of the satellite printing mechanism, the unwinding mechanism and the rewinding mechanism through a top frame. The satellite printing mechanism, the unwinding mechanism and the rewinding mechanism are arranged in parallel to form a compact structure. The printing material processing path is a loop structure.

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