A quick-drying label flatbed digital printing machine and printing method

Abstract

This invention discloses a quick-drying label flatbed digital printing machine and printing method, including a machine body with a machine compartment located at the center of the top surface of the machine body, and a paper inlet and a paper outlet at both ends of the machine body, respectively. The tension adjustment component of this invention does not use an elastic method to adjust tension. Instead, it uses a potentiometer to detect the pressure of the paper on the rotating frame to determine the appropriate angle of the rotating frame. A third servo reduction motor is used to adjust and lock the position of the rotating frame, resulting in more precise tension adjustment. After adjustment, the guide roller position is fixed, and the paper tension does not change during paper feeding, thus not affecting the printing effect. This invention also includes a moisturizing mechanism. Each time the machine stops, a moisturizing cover is placed on the inkjet head, and the moisturizing liquid on a moisturizing wipe is used to moisturize the inkjet head orifices, preventing ink from drying inside the orifices and keeping them moist. No manual cleaning or inkjet head moisturizing is required, resulting in a higher degree of automation and greater ease of use.

Description

Technical Field

[0001] This invention relates to the field of digital label printing equipment technology, specifically to a quick-drying digital label flatbed printing machine and printing method. Background Technology

[0002] Digital printing presses, also known as universal flatbed printers or flatbed printers, have broken through the bottlenecks of digital printing technology, achieving true one-page printing, no plate making required, and full-color image completion in one pass. They are a replacement product for traditional printing presses and are widely used in the label printing field. They are equipped with a dedicated paper feeding mechanism and, combined with digital printing, are called digital label printing presses. For example, Chinese utility model patent CN207676120U discloses a digital label printing press, including a housing with a tension unwinding mechanism inside, a tension rewinding mechanism on one side of the tension unwinding mechanism, and a printing engine on the top of the housing. The paper feeding structure of a digital label printing press is crucial, requiring good tension. Currently, tension adjustment in feeding structures mainly uses a movable guide roller with an elastic structure. For example, Chinese utility model patent CN210619652U discloses a paper conveyor belt tension adjustment device. In this paper conveyor belt tension adjustment device, a motor drives a transmission rod to rotate via a transmission device and a transmission belt. The paper conveyor belt follows the rotation of the transmission rod and rests on a tension adjustment wheel mounted on the tension adjustment rod. One end of the tension adjustment rod is mounted on the outer surface of the device body via a tension adjustment arm, a spring, and a spring fixing post. The tension adjustment arm acts as a lever to adjust the tension, and the spring ensures that the paper conveyor belt has a stable tension to complete the paper transport. In short, this paper conveyor belt tension adjustment device uses a spring to adjust the tension of the paper conveyor belt. However, current digital printing presses have the following drawbacks: Current digital printing presses use spring-type structures to apply pressure to the paper during tension adjustment. As the paper is fed, the adjusting rollers also move continuously under this pressure, causing unstable tension and affecting printing quality. Furthermore, current digital printing presses primarily use micro-piezoelectric or thermal inkjet printheads. Regardless of the type, the ink jet aperture is in the micrometer range. After the machine stops, the ink dries within the printhead apertures, easily causing blockages. Therefore, manual cleaning or moisturizing is required every time the machine stops, which is very inconvenient.

[0003] To address these issues, we propose a quick-drying digital label flatbed printer and printing method. Summary of the Invention

[0004] The purpose of this invention is to provide a quick-drying label flatbed digital printing machine and printing method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a quick-drying label flatbed digital printing machine, comprising a machine body, a machine compartment disposed at the center of the top surface of the machine body, a paper inlet and a paper outlet respectively opened at both ends of the machine body, two tension adjustment components disposed in the machine compartment near the paper inlet and the paper outlet, four inkjet heads uniformly fixed to the inner side wall of the machine compartment, and four moisturizing mechanisms disposed in the inner side wall of the machine compartment corresponding to the four inkjet heads. The tension adjustment assembly includes a circular plate fixed to the inner side wall of the machine compartment. A damping shaft is rotatably connected to the central side wall of the circular plate. A rotating frame is fixed to the end of the damping shaft. Two guide rollers are rotatably connected to the side walls of both ends of the rotating frame. A first large gear is fixedly sleeved on the damping shaft. A potentiometer is fixed to the side wall of the circular plate. A small gear is fixed to the rotating shaft end of the potentiometer. The small gear meshes with the first large gear. A third servo reduction motor is fixed to the side wall of the circular plate. A drive gear is fixed to the rotating shaft end of the third servo reduction motor. The drive gear meshes with the first large gear. The moisturizing mechanism includes a plate fixed to the inner side wall of the machine compartment. A through-hole is formed on the plate, and the through-hole is fitted with the end of the inkjet head. An L-shaped groove is formed at the lower part of the side wall of the plate, and a sliding plate is slidably connected in the L-shaped groove. The end of a horizontal plate is fixed to the side wall of the sliding plate. A moisturizing cover is provided on the side of the horizontal plate near the inkjet head. A sleeve is formed on the side of the moisturizing cover away from the horizontal plate. The sleeve is the same size and shape as the bottom of the inkjet head. A moisturizing wipe is fitted in the sleeve. An electric push rod is fixedly fitted in the middle of the horizontal plate. The output end of the electric push rod is fixed to the side wall of the moisturizing cover.

[0006] Preferably, a cylindrical chamber is fixed to the upper side wall of the plate, and a stirring structure is provided inside the cylindrical chamber. A second power rod is rotatably connected to the middle of one end of the cylindrical chamber near the plate. The second power rod passes through the plate. A liquid supply chamber is fixedly embedded in the side wall of the sleeve. Multiple liquid supply ports are evenly opened on the surface of the liquid supply chamber. A micro pump is fixedly connected to and connected to the cylindrical chamber. One end of the micro pump is fixedly connected to and connected to a liquid pipe. The other end of the liquid pipe passes through the side wall of the moisturizing cap and connects to the liquid supply chamber. Two hook-and-loop fastener layers are fixedly connected to both sides of the side wall of the sleeve. Two hook-and-loop fleece layers are fixedly connected to both sides of one side of the moisturizing wipe. The hook-and-loop fleece layers are bonded to the hook-and-loop fastener layers. Four guide rods are fixedly connected to the four corners of the moisturizing cap. Four guide holes are opened at the four corners of the horizontal plate. The guide rods slide and connect to the guide holes.

[0007] Preferably, the plate body is fixedly connected to the end of the side plate at the position between the top of the L-shaped groove and the inkjet head. The side plate is fixedly connected to the side block near the L-shaped groove. The side block away from the side plate has a sliding opening. A sliding block is slidably sleeved in the sliding opening. A pressure plate is fixedly connected to the side wall of the sliding block. Multiple springs are fixedly connected between the side wall of the sliding opening and the sliding block. A pressure sensor is fixedly connected to the side wall of the sliding opening. Multiple limiting grooves are opened on both sides of the sliding opening. Multiple limiting blocks are fixedly connected to both sides of the sliding block. The limiting blocks are slidably connected in the limiting grooves.

[0008] Preferably, a frame-shaped groove is formed inside the plate body, and the frame-shaped groove communicates with the side wall of the L-shaped groove. Four third synchronous pulleys are rotatably connected at the four corners of the frame-shaped groove, and a third synchronous belt is sleeved on the four third synchronous pulleys. A short block is fixed to the side wall of the slide plate, and the short block is fixed to the outer side wall of the third synchronous belt. A first power rod is fixed to the shaft of one of the third synchronous pulleys. The first power rod passes through the plate body. An L-shaped slide rail is fixed inside the L-shaped groove. Four guide wheels are rotatably connected to the side wall of the slide plate on both sides of the L-shaped slide rail. The guide wheels roll in contact with the L-shaped slide rail.

[0009] Preferably, a drive assembly is provided on the inner sidewall of the machine compartment corresponding to the four moisturizing mechanisms. The drive assembly includes a strip-shaped compartment, which is fixedly embedded in the inner sidewall of the machine compartment. Four first drive shafts are rotatably connected to the first power rod positions of the four moisturizing mechanisms on the strip-shaped compartment. The ends of the first drive shafts are fixedly connected to the ends of the first power rods. Two first synchronous pulleys are fixedly sleeved on each first drive shaft. First synchronous belts are sleeved on the first synchronous pulleys of two adjacent first drive shafts. A first servo reduction motor is fixedly connected to the end of the strip-shaped compartment. A fourth synchronous pulley is fixedly connected to the shaft end of the first servo reduction motor. A fourth synchronous belt is sleeved on the first synchronous pulley and the fourth synchronous pulley on the first drive shaft near the first servo reduction motor.

[0010] Preferably, four second drive shafts are rotatably connected to the second power rod positions corresponding to the four moisturizing mechanisms on the strip-shaped compartment. The shaft ends of the second drive shafts are fixedly connected to the ends of the second power rods. Two second synchronous pulleys are fixedly sleeved on each second drive shaft. Second synchronous belts are sleeved on the second synchronous pulleys of two adjacent second drive shafts. A second servo reduction motor is fixedly connected to one end of the strip-shaped compartment. A fifth synchronous pulley is fixedly connected to the shaft end of the second servo reduction motor. A fifth synchronous belt is sleeved on the second synchronous pulley and the fifth synchronous pulley on the second drive shaft near the second servo reduction motor.

[0011] Preferably, the stirring structure includes a main shaft, which is horizontally rotatably connected to the center of the cylindrical silo. Two second large gears are rotatably sleeved at both ends of the main shaft, and the second large gears are fixed to the inner sidewall of the cylindrical silo. Multiple main stirring blades are fixedly connected to the circumference of the main shaft. Scrapers are fixedly connected to the free ends of the multiple main stirring blades located at the same horizontal position. The ends of the scrapers contact the inner sidewall of the cylindrical silo. A sub-shaft is rotatably sleeved at the middle of the multiple main stirring blades located at the same horizontal position. Multiple sub-stirring blades are fixedly connected to the circumference of the sub-shaft. Two driven pinions are fixedly connected to both ends of the sub-shaft. The driven pinions mesh with the second large gears. The end of the second power rod is fixedly connected to the end of the main shaft.

[0012] Preferably, one side of the machine compartment has an open structure, and a sealing door plate is rotatably connected to the open side of the machine compartment. An inlet is opened at the bottom of the machine compartment near the paper inlet, and an outlet is opened at the bottom of the other side of the machine compartment. A paper feed pressure roller is rotatably connected inside the inlet, and a paper output pressure roller is rotatably connected inside the outlet. Four ink supply systems are fixed to the inner side wall of the machine compartment, and the ink supply systems are connected to the inkjet head. A UV curing lamp is fixed to the inner side wall of the machine compartment near the outlet. An annular plate is fixed to the surface of the circular plate, and an annular groove is opened on the surface of the annular plate. Two sliding columns are fixed to the side wall of the rotating frame, and the two sliding columns are slidably connected in the annular groove.

[0013] Preferably, the paper inlet sidewall is rotatably connected to a paper feed roller, the end of which is rotatably connected to a first ball bearing; the paper outlet sidewall is rotatably connected to a paper take-up roller, the end of which is rotatably connected to a second ball bearing; the paper inlet is rotatably connected to a first cover plate, and the paper take-up roller is rotatably connected to a second cover plate; the first cover plate rolls in contact with the first ball bearing, and the second cover plate rolls in contact with the second ball bearing; two first support rollers are rotatably connected to the top surface of the machine body near the paper inlet; an n-shaped frame is fixedly mounted on the top surface of the machine body above the two first support rollers; an ionizer is fixedly sleeved in the middle of the n-shaped frame; two first fine pressure rollers are rotatably connected to the inner top surface of the n-shaped frame directly above the two first support rollers; a first top opening is opened on the top surface of the machine body near the first support roller of the machine compartment; a second top opening is opened on the top surface of the machine body near the inlet; a third top opening is opened on the top surface of the machine body near the outlet; and the top surface of the machine body rotates directly below the paper feed pressure roller. The machine body is connected to a feed roller. A discharge roller is rotatably connected to the top surface of the machine body, located directly below the discharge pressure roller. Two second support rollers are rotatably connected to the top surface of the machine body near the receiving end. Two support plates are hung on both sides of the two second support rollers on the top surface of the machine body. A transparent observation plate is fixed to the top surface of the two support plates. Two second fine pressure rollers are rotatably connected between the two support plates, located directly above the two second support rollers. A fourth top opening is opened on the machine body near the second support roller in the machine compartment. Multiple third support rollers are rotatably connected to the top surface of the machine body inside the machine compartment. A first transfer roller is rotatably connected to the inside of the machine body near the second top opening. A second transfer roller is rotatably connected to the inside of the machine body near the third top opening. A paper feeding motor and a paper receiving motor are fixed to the side walls at both ends of the machine body, respectively. The end of the paper feeding motor shaft is fixed to the end of the feed roller, and the end of the paper receiving motor shaft is fixed to the end of the receiving roller. A control computer is fixed to the top surface of the machine body near the machine compartment.

[0014] This invention also provides a printing method for a quick-drying label flatbed digital printing machine, comprising the following steps: Step 1: Powering on: With the power off, the moisturizing cover in the moisturizing mechanism should be placed on the bottom of the inkjet head. Before powering on, the electric push rod moves the moisturizing cover down away from the inkjet head, and then moves it to the top of the L-shaped groove. The electric push rod then moves the moisturizing cover so that it is placed on the side block. After that, install the paper roll on the feed roller and take-up roller, and then you can power on the machine. Step 2 Speed ​​Adjustment: After power-on, the third servo geared motor in the tension adjustment assembly is de-energized and will not lock the rotating frame. The rotating frame will generate rotational force under the action of paper feeding. At this time, the small gear on the potentiometer will rotate and generate a voltage signal. The voltage intensity is used to determine the position of the rotating frame. Then, the third servo geared motor drives the rotating frame to move to that position. After at least three voltage judgments, the rotating frame is placed in the appropriate position. At the same time, the third servo geared motor is kept energized to lock the position of the rotating frame and complete the tension adjustment. Step 3: The paper passes through the two first support rollers, where static electricity is removed by the ion air bar, and then it enters the machine chamber. It is then printed by inkjet printing through four inkjet heads, cured and dried by UV curing lamps, and finally enters the take-up roller. Step 4: Shutdown: After the printing operation is completed, the device stops printing. At this time, the micro pump introduces moisturizing liquid into the supply chamber. The moisturizing liquid overflows from the supply port and soaks the moisturizing wipes. The moisturizing wipes absorb the moisturizing liquid and expand slightly. The pressure plate will make a slight displacement. After the pressure sensor detects this pressure, it means that the moisturizing wipes are sufficiently soaked. At this time, the micro pump stops supplying moisturizing liquid. The electric push rod drives the moisturizing cover away from the side block. The moisturizing cover moves to the end of the L-shaped groove. The electric push rod drives the moisturizing cover to move up and fit onto the bottom of the inkjet head. Under pressure, the moisturizing liquid in the moisturizing wipe is squeezed into the end of the inkjet head orifice to achieve moisturization. Then, the power is turned off to stop the machine.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention's tension adjustment component does not use an elastic method to adjust tension. Instead, it uses a potentiometer to detect the pressure of the paper on the printhead to determine the appropriate angle for the printhead. A third servo reduction motor is used to adjust and lock the position of the printhead, resulting in more precise tension adjustment. After adjustment, the guide roller position is fixed, and the paper tension does not change during paper feeding, thus not affecting the printing effect. This invention also features a moisturizing mechanism. Each time the machine stops, the moisturizing cover is placed on the inkjet head, and the moisturizing liquid on the moisturizing wipe is used to moisturize the inkjet head orifices, preventing ink from drying inside the orifices and keeping them moist. This eliminates the need for manual cleaning or moisturizing of the inkjet head, resulting in a higher degree of automation and greater ease of use. Attached Figure Description

[0016] Figure 1 These are schematic diagrams of the main structure in the first, second, and third embodiments of the present invention; Figure 2 These are schematic diagrams of the main body cross-section structure in the first, second, and third embodiments of the present invention; Figure 3 This is a schematic diagram of the structure on the other side of the main body in the first, second, and third embodiments of the present invention; Figure 4 These are schematic diagrams of the tension adjustment component in the first, second, and third embodiments of the present invention; Figure 5 These are cross-sectional structural diagrams of the tension adjustment component in the first, second, and third embodiments of the present invention; Figure 6 These are schematic diagrams of the moisturizing mechanism in the first, second, and third embodiments of the present invention; Figure 7 These are cross-sectional structural diagrams of the moisturizing mechanism in the first, second, and third embodiments of the present invention; Figure 8 These are schematic diagrams of the cross-sectional structure of the plate in the first, second, and third embodiments of the present invention; Figure 9 For the present invention Figure 7 Enlarged structural diagram of point A in the middle; Figure 10 These are schematic diagrams of the cross-sectional structure at the cylindrical silo in the second and third embodiments of the present invention; Figure 11 These are schematic diagrams of the stirring structure in the second and third embodiments of the present invention; Figure 12 This is a cross-sectional view of the drive component in the second and third embodiments of the present invention.

[0017] In the diagram: 1. Machine body; 2. Machine compartment; 3. Tension adjustment assembly; 4. Humidification mechanism; 5. Drive assembly; 11. Paper inlet; 12. Paper outlet; 13. Paper feed roller; 14. First ball bearing; 15. Paper take-up roller; 16. Second ball bearing; 17. First support roller; 18. N-shaped frame; 19. Ionizing air bar; 110. First top opening; 111. First transfer roller; 112. Second top opening; 113. Feed roller; 114. Third top opening; 115. Discharge roller; 116. Second transfer roller; 117. Second support roller; 118. Fourth top opening; 119. Support plate; 120. Transparent observation plate; 121. First fine pressure roller; 122. Second fine pressure roller; 12 3. Paper feed motor; 124. Paper take-up motor; 125. First cover plate; 126. Second cover plate; 127. Third support roller; 128. Control computer; 21. Sealing door panel; 22. Inlet; 23. Outlet; 24. Inkjet head; 25. Ink supply system; 26. UV curing lamp; 27. Paper feed pressure roller; 28. Paper output pressure roller; 31. Circular plate; 32. Damping shaft; 33. Turning frame; 34. Guide roller; 35. First large gear; 36. Potentiometer; 37. Small gear; 38. Third servo geared motor; 39. Drive gear; 310. Ring plate; 311. Ring groove; 312. Sliding column; 41. Plate body; 42. Through-hole; 43. Cylindrical compartment; 44. 45. Stirring structure; 46. L-shaped trough; 47. Slide plate; 48. Horizontal plate; 49. Moisturizing cover; 410. Sleeve opening; 411. Moisturizing wipe; 412. Liquid supply chamber; 413. Liquid supply port; 414. Micro pump; 415. Liquid pipe; 416. Electric actuator; 417. Velcro hook layer; 418. Velcro fleece layer; 419. Guide rod; 420. Guide hole; 421. Side plate; 422. Side block; 423. Sliding port; 424. Sliding block; 425. Pressure plate; 426. Pressure sensor; 427. Spring; 428. Limiting groove; 429. Limiting block; 430. Frame groove; 431. Third synchronous belt pulley; 432. Third synchronous belt; 433. Short 433. Block; 434. Guide wheel; 435. L-shaped slide rail; 436. First power rod; 437. Second power rod; 448. Main shaft; 449. Second large gear; 440. Main stirring blade; 441. Scraper; 442. Sub-shaft; 443. Sub-stirring blade; 444. Driven pinion; 55. Strip-shaped bin; 56. First drive shaft; 57. First synchronous belt pulley; 58. First servo geared motor; 59. Fourth synchronous belt pulley; 50. Second drive shaft; 510. Second synchronous belt; 511. Second servo geared motor; 512. Fifth synchronous belt pulley; 513. Fifth synchronous belt. Detailed Implementation

[0018] 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. Example 1

[0019] Please see Figure 1-9 The present invention provides a technical solution: a quick-drying label flatbed digital printing machine, including a machine body 1, a machine chamber 2 is arranged at the center of the top surface of the machine body 1, and a paper inlet 11 and a paper outlet 12 are respectively opened at both ends of the machine body 1. Two tension adjustment components 3 are arranged in the machine chamber 2 near the paper inlet 11 and the paper outlet 12. Four inkjet heads 24 are evenly fixed to the inner side wall of the machine chamber 2, and four moisturizing mechanisms 4 are arranged in the inner side wall of the machine chamber 2 corresponding to the four inkjet heads 24. The tension adjustment assembly 3 includes a circular plate 31 fixed to the inner side wall of the machine compartment 2. A damping shaft 32 is rotatably connected to the central side wall of the circular plate 31. A rotating frame 33 is fixed to the end of the damping shaft 32. Two guide rollers 34 are rotatably connected to the side walls of the two ends of the rotating frame 33. A first large gear 35 is fixedly sleeved on the damping shaft 32. A potentiometer 36 is fixed to the side wall of the circular plate 31. A small gear 37 is fixed to the rotating shaft end of the potentiometer 36. The small gear 37 meshes with the first large gear 35. A third servo reduction motor 38 is fixed to the side wall of the circular plate 31. A drive gear 39 is fixed to the rotating shaft end of the third servo reduction motor 38. The drive gear 39 meshes with the first large gear 35. The tension adjustment assembly 3 does not use an elastic method to adjust the tension. The angle that the rotating frame 33 should be in is determined by the pressure of the paper on the rotating frame 33 reflected by the potentiometer 36. The position of the rotating frame 33 is adjusted and locked by the third servo reduction motor 38. The tension adjustment is more precise. After the adjustment is completed, the position of the guide rollers 34 is fixed. The paper tension will not change during the paper feeding process and will not affect the printing effect. The moisturizing mechanism 4 includes a plate 41 fixed to the inner wall of the housing 2. A through-hole 42 is formed on the plate 41, through-hole 42 is fitted onto the end of the inkjet head 24. An L-shaped groove 45 is formed at the lower part of the side wall of the plate 41, and a sliding plate 46 is slidably connected within the L-shaped groove 45. The end of a horizontal plate 47 is fixed to the side wall of the sliding plate 46. A moisturizing cover 48 is provided on the side of the horizontal plate 47 near the inkjet head 24. A sleeve 49 is formed on the side of the moisturizing cover 48 away from the horizontal plate 47. The sleeve 49 is the same size and shape as the bottom of the inkjet head 24. The system includes a moisturizing wipe 410 fitted inside the sleeve 49, and an electric push rod 415 fixedly fitted in the middle of the horizontal plate 47. The output end of the electric push rod 415 is fixedly connected to the side wall of the moisturizing cover 48. Each time the machine stops, the moisturizing cover 48 in the moisturizing mechanism 4 is fitted onto the inkjet head 24. The moisturizing liquid soaked in the moisturizing wipe 410 is used to moisturize the holes of the inkjet head 24, preventing the ink from drying in the holes and keeping it moist. There is no need for manual cleaning or moisturizing of the inkjet head 24, which is more automated and more convenient to use. Example 2

[0020] Please see Figure 1-12 This is the second embodiment of the present invention, based on the previous embodiment. A cylindrical chamber 43 is fixedly connected to the upper side wall of the plate 41. A stirring structure 44 is provided inside the cylindrical chamber 43. A second power rod 436 is rotatably connected to the middle of one end of the cylindrical chamber 43 near the plate 41. The second power rod 436 penetrates the plate 41. A liquid supply chamber 411 is fixedly embedded in the side wall of the sleeve 49. Multiple liquid supply ports 412 are evenly distributed on the surface of the liquid supply chamber 411. A micro pump 413 is fixedly connected to and connected to the cylindrical chamber 43. The micro pump 413 is fixedly connected to and connected to a liquid pipe 414. One end of the liquid tube 414 passes through the side wall of the moisturizing cap 48 and connects to the liquid supply chamber 411. Two hook-and-loop fastener layers 416 are fixed to both sides of the side wall of the sleeve 49. Two hook-and-loop fastener fleece layers 417 are fixed to both sides of one side of the moisturizing wipe 410. The hook-and-loop fleece layers 417 are bonded to the hook-and-loop fastener layers 416. Four guide rods 418 are fixed to the four corners of the moisturizing cap 48. Four guide holes 419 are opened at the four corners of the horizontal plate 47. The guide rods 418 slide into the guide holes 419 and fix the moisturizing wipe 410 with hook-and-loop fasteners for easy replacement later.

[0021] The plate 41 is located between the top of the L-shaped groove 45 and the inkjet head 24 and is fixed to the end of the side plate 420. The side plate 420 is fixed to the side block 421 near the L-shaped groove 45. The side block 421 is opened with a sliding opening 422 away from the side plate 420. The sliding block 423 is slidably sleeved in the sliding opening 422. The side wall of the sliding block 423 is fixed to the pressure plate 424. Multiple springs 426 are fixed between the side wall of the sliding opening 422 and the sliding block 423. The side wall of the sliding opening 422 is fixed to the pressure sensor 425. Multiple limiting grooves 427 are opened on both sides of the sliding opening 422. Multiple limiting blocks 428 are fixed on both sides of the sliding block 423. The limiting blocks 428 are slidably connected in the limiting grooves 427. The pressure sensor 425 is used to determine whether the moisturizing wipes 410 are sufficiently soaked.

[0022] A frame-shaped groove 429 is opened inside the plate 41. The frame-shaped groove 429 is connected to the side wall of the L-shaped groove 45. Four third synchronous pulleys 430 are rotatably connected at the four corners of the frame-shaped groove 429. The third synchronous belt 431 is sleeved on the four third synchronous pulleys 430. The side wall of the slide plate 46 is fixedly connected to a short block 432. The short block 432 is fixedly connected to the outer side wall of the third synchronous belt 431. The first power rod 435 is fixedly connected to the pivot of one of the third synchronous pulleys 430. The first power rod 435 passes through the plate 41. The L-shaped slide rail 434 is fixedly connected inside the L-shaped groove 45. The side wall of the slide plate 46 is located on both sides of the L-shaped slide rail 434 and is rotatably connected to four guide wheels 433. The guide wheels 433 roll in contact with the L-shaped slide rail 434.

[0023] A drive assembly 5 is provided on the inner wall of the machine compartment 2 at the positions corresponding to the four moisturizing mechanisms 4. The drive assembly 5 includes a strip-shaped compartment 51, which is fixedly embedded in the inner wall of the machine compartment 2. Four first drive shafts 52 are rotatably connected to the strip-shaped compartment 51 at the positions corresponding to the first power rods 435 of the four moisturizing mechanisms 4. The ends of the first drive shafts 52 are fixedly connected to the ends of the first power rods 435. Two first synchronous pulleys 53 are fixedly sleeved on each first drive shaft 52. First synchronous belts 54 are sleeved on the first synchronous pulleys 53 of two adjacent first drive shafts 52. A first servo reduction motor 55 is fixedly connected to the end of the strip-shaped compartment 51. A fourth synchronous pulley 56 is fixedly connected to the shaft end of the first servo reduction motor 55. A fourth synchronous belt 57 is sleeved on the first synchronous pulleys 53 and the fourth synchronous pulley 56 of the first drive shaft 52 near the first servo reduction motor 55. The movement of the moisturizing cover 48 is driven by the first servo reduction motor 55.

[0024] Four second drive shafts 58 are rotatably connected to the second power rods 436 of the four moisturizing mechanisms 4 on the strip-shaped chamber 51. The shaft ends of the second drive shafts 58 are fixed to the ends of the second power rods 436. Two second synchronous pulleys 59 are fixedly sleeved on each second drive shaft 58. Second synchronous belts 510 are sleeved on the second synchronous pulleys 59 of two adjacent second drive shafts 58. A second servo reduction motor 511 is fixedly connected to one end of the strip-shaped chamber 51. A fifth synchronous pulley 512 is fixedly connected to the shaft end of the second servo reduction motor 511. A fifth synchronous belt 513 is sleeved on the second synchronous pulleys 59 and the fifth synchronous pulley 512 of the second drive shaft 58 near the second servo reduction motor 511. The second power rods 436 are driven to rotate by the second servo reduction motor 511, thereby driving the stirring structure 44.

[0025] The stirring structure 44 includes a main shaft 441, which is horizontally rotatably connected to the center of the cylindrical silo 43. Two second large gears 442 are rotatably sleeved at both ends of the main shaft 441. The second large gears 442 are fixed to the inner wall of the cylindrical silo 43. Multiple main stirring blades 443 are fixed to the circumference of the main shaft 441. Scrapers 444 are fixed to the free ends of the multiple main stirring blades 443 located at the same horizontal position. The ends of the scrapers 444 contact the inner wall of the cylindrical silo 43. A sub-shaft 445 is rotatably sleeved in the middle of the multiple main stirring blades 443 located at the same horizontal position. Multiple sub-stirring blades 446 are fixed to the circumference of the sub-shaft 445. Two driven pinions 447 are fixed to both ends of the sub-shaft 445. The driven pinions 447 mesh with the second large gears 442. The end of the second power rod 436 is fixed to the end of the main shaft 441. The stirring structure 44 ensures that the moisturizing liquid in the cylindrical silo 43 flows evenly.

[0026] One side of the machine compartment 2 is open, and a sealing door panel 21 is rotatably connected to the open side of the machine compartment 2. An inlet 22 is opened at the bottom of the machine compartment 2 near the paper inlet 11, and an outlet 23 is opened at the bottom of the other side of the machine compartment 2. A paper feed pressure roller 27 is rotatably connected inside the inlet 22, and a paper output pressure roller 28 is rotatably connected inside the outlet 23. Four ink supply systems 25 are fixed to the inner wall of the machine compartment 2, and the ink supply systems 25 are connected to the inkjet head 24. A UV curing lamp 26 is fixed to the inner wall of the machine compartment 2 near the outlet 23. A ring plate 310 is fixed to the surface of the circular plate 31, and a ring groove 311 is opened on the surface of the ring plate 310. Two sliding columns 312 are fixed to the side wall of the rotating frame 33, and the two sliding columns 312 are slidably connected in the ring groove 311.

[0027] The paper inlet 11 is rotatably connected to the paper feed roller 13, and the end of the paper feed roller 13 is rotatably connected to the first ball bearing 14. The paper take-up outlet 12 is rotatably connected to the paper take-up roller 15, and the end of the paper take-up roller 15 is rotatably connected to the second ball bearing 16. The paper inlet 11 is rotatably connected to the first cover plate 125, and the paper take-up outlet 12 is rotatably connected to the second cover plate 126. The first cover plate 125 rolls in contact with the first ball bearing 14, and the second cover plate 126 rolls in contact with the second ball bearing 16. Two first support rollers 17 are rotatably connected to the top surface of the machine body 1 near the paper inlet 11. The top surface of the machine body 1 is located at the position of the two first support rollers 17. An n-shaped frame 18 is fixedly connected above the support roller 17. An ionizer 19 is fixedly sleeved in the middle of the n-shaped frame 18. The inner top surface of the n-shaped frame 18 is rotatably connected to two first fine pressure rollers 121, located directly above the two first support rollers 17. A first top opening 110 is opened on the machine body 1 near the first support roller 17 of the machine compartment 2. A second top opening 112 is opened on the top surface of the machine body 1 near the inlet 22. A third top opening 114 is opened on the top surface of the machine body 1 near the outlet 23. A feed roller 113 is rotatably connected to the top surface of the machine body 1 directly below the paper feed pressure roller 27. The top surface of the machine body 1 is rotatably connected to the output roller 115 directly below the output pressure roller 28. Two second support rollers 117 are rotatably connected to the top surface of the machine body 1 near the receiving port 12. Two support plates 119 are hung on both sides of the two second support rollers 117 on the top surface of the machine body 1. A transparent observation plate 120 is fixed to the top surface of the two support plates 119. Two second fine pressure rollers 122 are rotatably connected between the two support plates 119 directly above the two second support rollers 117. A fourth top opening 1 is opened on the machine body 1 near the second support roller 117 of the machine compartment 2. 18. Multiple third support rollers 127 are rotatably connected to the top surface of the machine body 1 inside the machine compartment 2. The first transfer roller 111 is rotatably connected to the inside of the machine body 1 near the second top opening 112. The second transfer roller 116 is rotatably connected to the inside of the machine body 1 near the third top opening 114. The paper feeding motor 123 and the paper receiving motor 124 are fixedly connected to the side walls at both ends of the machine body 1, respectively. The end of the shaft of the paper feeding motor 123 is fixedly connected to the end of the paper feed roller 13. The end of the shaft of the paper receiving motor 124 is fixedly connected to the end of the paper receiving roller 15. The control computer 128 is fixedly connected to the top surface of the machine body 1 near the machine compartment 2. Example 3

[0028] Please see Figure 1-12 This is the third embodiment of the present invention, which is based on the above two embodiments. This embodiment provides a printing method for a quick-drying label flatbed digital printing machine, including the following steps: Step 1: Powering on: With the power off, the moisturizing cover 48 in the moisturizing mechanism 4 should be placed on the bottom of the inkjet head 24. Before powering on, the electric push rod 415 moves the moisturizing cover 48 down away from the inkjet head 24, and then moves it to the top of the L-shaped groove 45. The electric push rod 415 moves the moisturizing cover 48 so that it is placed on the side block 421. Then, the paper roll is installed on the feed roller 13 and the take-up roller 15, and the power can be turned on. Step 2 Speed ​​Adjustment: After power-on, the third servo reduction motor 38 in the tension adjustment component 3 is de-energized and will not lock the rotating frame 33. The rotating frame 33 will generate rotational force under the action of paper feeding. At this time, the small gear 37 on the potentiometer 36 will rotate and generate a voltage signal. The voltage intensity is used to determine the position that the rotating frame 33 should be in. Then, the third servo reduction motor 38 drives the rotating frame 33 to move to that position. After at least three voltage judgments, the rotating frame 33 is placed in the appropriate position. At the same time, the third servo reduction motor 38 is kept energized to lock the position of the rotating frame 33, thus completing the tension adjustment. Step 3: The paper passes through the two first support rollers 17, where static electricity is removed by the ion air bar 19, and then enters the machine chamber 2. It is then printed by inkjet printing through four inkjet heads 24, and then cured and dried by UV curing lamps 26 before finally entering the take-up roller 15. Step 4: Shutdown: After the operation is completed, the device stops printing. At this time, the micro pump 413 introduces moisturizing liquid into the supply chamber 411. The moisturizing liquid overflows from the supply port 412 and soaks the moisturizing wipes 410. The moisturizing wipes 410 absorb the moisturizing liquid and expand slightly. The pressure plate 424 will produce a slight displacement. After the pressure sensor 425 detects the pressure, it indicates that the moisturizing wipes 410 are sufficiently soaked. At this time, the micro pump 413 stops inputting moisturizing liquid. The electric push rod 415 drives the moisturizing cover 48 away from the side block 421. The moisturizing cover 48 moves to the end of the L-shaped groove 45. The electric push rod 415 drives the moisturizing cover 48 to move up and fit onto the bottom of the inkjet head 24. Under pressure, the moisturizing liquid in the moisturizing wipes 410 is squeezed into the end of the inkjet head 24 hole to achieve moisturization. Then, the power is turned off and the machine is stopped. Example 4

[0029] Please see Figure 1-12This is the fourth embodiment of the present invention, based on the above three embodiments. When using the present invention, in the off state, the moisturizing cover 48 in the moisturizing mechanism 4 should be fitted onto the bottom of the inkjet head 24. Before starting the machine, the electric push rod 415 moves the moisturizing cover 48 down away from the inkjet head 24, and then moves it to the top of the L-shaped groove 45. The electric push rod 415 then moves the moisturizing cover 48 so that it fits onto the side block 421. Afterwards, the paper roll is installed on the feed roller 13 and the take-up roller 15, and the machine can be started. After starting the machine, the third servo reduction motor 38 in the tension adjustment assembly 3 is de-energized and will not lock the rotating frame 33. The rotating frame 33 will generate rotational force under the action of paper feeding. At this time, the small gear 37 on the potentiometer 36 rotates, which will... A voltage signal is generated, and the position of the rotating frame 33 is determined by the voltage intensity. Then, the third servo reduction motor 38 drives the rotating frame (33) to move to that position. After at least three voltage judgments, the rotating frame 33 is positioned appropriately. At the same time, the third servo reduction motor 38 remains energized, locking the position of the rotating frame 33 and completing the tension adjustment. The paper passes through the two first support rollers 17, where static electricity is removed by the ion air bar 19, and then enters the machine chamber 2. It is then printed by inkjet printing through the four inkjet heads 24, and then cured and dried by the UV curing lamp 26. Finally, it enters the take-up roller 15. After the operation is completed, the device stops the printing operation. At this time, the micro pump 413 introduces the moisturizing liquid into the supply chamber 411 to moisturize. Liquid overflows from the supply port 412, soaking the moisturizing wipe 410. The moisturizing wipe 410 absorbs the moisturizing liquid and expands slightly, causing a slight displacement of the pressure plate 424. The pressure sensor 425 detects this pressure, indicating that the moisturizing wipe 410 is sufficiently soaked. At this point, the micro pump 413 stops supplying moisturizing liquid, and the electric push rod 415 moves the moisturizing cover 48 away from the side block 421. The moisturizing cover 48 moves to the end of the L-shaped groove 45, and the electric push rod 415 moves the moisturizing cover 48 upwards to fit over the bottom of the inkjet head 24. Under pressure, the moisturizing liquid in the moisturizing wipe 410 is squeezed into the end of the inkjet head 24 orifice, achieving moisturization. Then, the power is turned off to stop the machine. The tension adjustment component 3 of this invention does not use an elastic method. The tension is adjusted by using potentiometer 36 to detect the pressure of the paper on the rotating frame 33 to determine the appropriate angle for the rotating frame 33. The third servo reduction motor 38 is used to adjust and lock the position of the rotating frame 33, resulting in more precise tension adjustment. After adjustment, the position of the guide roller 34 is fixed, and the paper tension will not change during paper feeding, thus not affecting the printing effect. The present invention is equipped with a moisturizing mechanism 4. Each time the machine stops, the moisturizing cover 48 in the moisturizing mechanism 4 is placed on the inkjet head 24. The moisturizing liquid soaked in the moisturizing wipe 410 is used to moisturize the holes of the inkjet head 24, preventing the ink from drying in the holes and keeping it moist. There is no need for manual cleaning or moisturizing of the inkjet head 24, resulting in a higher degree of automation and greater convenience of use.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-drying label flatbed digital printing machine, comprising a machine body (1), characterized in that: The machine body (1) has a machine compartment (2) at the center of its top surface. The machine body (1) has a paper inlet (11) and a paper outlet (12) at both ends. Two tension adjustment components (3) are provided in the machine compartment (2) near the paper inlet (11) and the paper outlet (12). Four inkjet heads (24) are evenly fixed to the inner side wall of the machine compartment (2). Four moisturizing mechanisms (4) are provided in the inner side wall of the machine compartment (2) corresponding to the four inkjet heads (24). The tension adjustment assembly (3) includes a circular plate (31) fixed to the inner side wall of the machine compartment (2). The central side wall of the circular plate (31) is rotatably connected to a damping shaft (32). The end of the damping shaft (32) is fixedly connected to a rotating frame (33). The two side walls of the rotating frame (33) are rotatably connected to two guide rollers (34). A first large gear (35) is fixedly sleeved on the damping shaft (32). A potentiometer (36) is fixedly connected to the side wall of the circular plate (31). A small gear (37) is fixedly connected to the rotating shaft end of the potentiometer (36). The small gear (37) meshes with the first large gear (35). A third servo geared motor (38) is fixedly connected to the side wall of the circular plate (31). A drive gear (39) is fixedly connected to the rotating shaft end of the third servo geared motor (38). The drive gear (39) meshes with the first large gear (35). The moisturizing mechanism (4) includes a plate (41) fixed to the inner side wall of the machine compartment (2). A through-hole (42) is opened on the plate (41). The through-hole (42) is sleeved on the end of the inkjet head (24). An L-shaped groove (45) is opened at the lower part of the side wall of the plate (41). A sliding plate (46) is slidably connected in the L-shaped groove (45). The end of a horizontal plate (47) is fixed to the side wall of the sliding plate (46). A moisturizing cover (48) is provided on the side of the horizontal plate (47) near the inkjet head (24). A sleeve opening (49) is opened on the side of the moisturizing cover (48) away from the horizontal plate (47). The sleeve opening (49) is the same size and shape as the bottom of the inkjet head (24). A moisturizing wipe (410) is sleeved in the sleeve opening (49). An electric push rod (415) is fixedly sleeved in the middle of the horizontal plate (47). The output end of the electric push rod (415) is fixed to the side wall of the moisturizing cover (48). A cylindrical chamber (43) is fixedly connected to the upper side wall of the plate (41). A stirring structure (44) is provided inside the cylindrical chamber (43). A second power rod (436) is rotatably connected to the middle of one end of the cylindrical chamber (43) near the plate (41). The second power rod (436) penetrates the plate (41). A liquid supply chamber (411) is fixedly embedded in the side wall of the sleeve (49). Multiple liquid supply ports (412) are evenly opened on the surface of the liquid supply chamber (411). A micro pump (413) is fixedly connected and connected to the cylindrical chamber (43). The micro pump (413) is fixedly connected and connected to the liquid pipe (4). 14) At one end, the liquid tube (414) passes through the side wall of the moisturizing cover (48) and connects to the liquid supply chamber (411). Two hook and loop layers (416) are fixed to both sides of the side wall of the sleeve (49). Two hook and loop fleece layers (417) are fixed to both sides of one side of the moisturizing wipe (410). The hook and loop fleece layers (417) are bonded to the hook and loop layers (416). Four guide rods (418) are fixed to the four corners of the moisturizing cover (48). Four guide holes (419) are opened at the four corners of the horizontal plate (47). The guide rods (418) slide and connect to the guide holes (419).

2. The quick-drying label flatbed digital printing machine according to claim 1, characterized in that: The plate (41) is fixed to the end of the side plate (420) between the top of the L-shaped groove (45) and the inkjet head (24). The side plate (420) is fixed to the side block (421) near the L-shaped groove (45). The side block (421) is opened with a sliding opening (422) away from the side plate (420). The sliding block (423) is slidably sleeved in the sliding opening (422). The side wall of the sliding block (423) is fixed to the pressure plate (424). Multiple springs (426) are fixed between the side wall of the sliding opening (422) and the sliding block (423). The side wall of the sliding opening (422) is fixed to the pressure sensor (425). Multiple limiting grooves (427) are opened on both sides of the sliding opening (422). Multiple limiting blocks (428) are fixed on both sides of the sliding block (423). The limiting blocks (428) are slidably connected in the limiting grooves (427).

3. The quick-drying label flatbed digital printing machine according to claim 2, characterized in that: The plate (41) has a frame-shaped groove (429) inside, which is connected to the side wall of the L-shaped groove (45). Four third synchronous pulleys (430) are rotatably connected at the four corners of the frame-shaped groove (429). A third synchronous belt (431) is sleeved on the four third synchronous pulleys (430). A short block (432) is fixed to the side wall of the slide plate (46). The short block (432) is fixed to the outer side wall of the third synchronous belt (431). A first power rod (435) is fixed to the shaft of one of the third synchronous pulleys (430). The first power rod (435) passes through the plate (41). An L-shaped slide rail (434) is fixed inside the L-shaped groove (45). Four guide wheels (433) are rotatably connected to the side wall of the slide plate (46) on both sides of the L-shaped slide rail (434). The guide wheels (433) roll in contact with the L-shaped slide rail (434).

4. The quick-drying label flatbed digital printing machine according to claim 3, characterized in that: The inner wall of the machine compartment (2) is provided with a drive assembly (5) corresponding to the four moisturizing mechanisms (4). The drive assembly (5) includes a strip-shaped compartment (51), which is fixedly embedded in the inner wall of the machine compartment (2). The strip-shaped compartment (51) is rotatably connected to four first drive shafts (52) corresponding to the first power rods (435) of the four moisturizing mechanisms (4). The ends of the first drive shafts (52) are fixedly connected to the ends of the first power rods (435). Each first drive shaft (52) is fixedly sleeved. Two first synchronous pulleys (53) are connected, and a first synchronous belt (54) is sleeved on the first synchronous pulleys (53) on the two adjacent first drive shafts (52). A first servo geared motor (55) is fixed to the end of the bar-shaped compartment (51), and a fourth synchronous pulley (56) is fixed to the shaft end of the first servo geared motor (55). A fourth synchronous belt (57) is sleeved on the first synchronous pulley (53) and the fourth synchronous pulley (56) on the first drive shaft (52) near the first servo geared motor (55).

5. A quick-drying label flatbed digital printing machine according to claim 4, characterized in that: The strip-shaped compartment (51) is rotatably connected to four second drive shafts (58) at the positions of the second power rods (436) corresponding to the four moisturizing mechanisms (4). The shaft ends of the second drive shafts (58) are fixed to the ends of the second power rods (436). Two second synchronous pulleys (59) are fixedly sleeved on each second drive shaft (58). A second synchronous belt (510) is sleeved on the second synchronous pulleys (59) on two adjacent second drive shafts (58). A second servo reduction motor (511) is fixedly connected to one end of the strip-shaped compartment (51). A fifth synchronous pulley (512) is fixedly connected to the shaft end of the second servo reduction motor (511). A fifth synchronous belt (513) is sleeved on the second synchronous pulleys (59) and the fifth synchronous pulleys (512) on the second drive shafts (58) near the second servo reduction motor (511).

6. The quick-drying label flatbed digital printing machine according to claim 1, characterized in that: The stirring structure (44) includes a main shaft (441), which is horizontally rotatably connected to the center inside the cylindrical silo (43). Two second large gears (442) are rotatably sleeved at both ends of the main shaft (441). The second large gears (442) are fixed to the inner side wall of the cylindrical silo (43). Multiple main stirring blades (443) are fixed to the periphery of the main shaft (441). Scrapers (444) are fixed to the free ends of the multiple main stirring blades (443) located at the same horizontal position. The scraper (444) has its end in contact with the inner wall of the cylindrical silo (43). The middle of the multiple main stirring blades (443) located at the same horizontal position is rotated and sleeved with the sub-shaft (445). Multiple sub-stirring blades (446) are fixed around the sub-shaft (445). Two driven pinions (447) are fixed at both ends of the sub-shaft (445). The driven pinions (447) mesh with the second large gear (442). The end of the second power rod (436) is fixed to the end of the main shaft (441).

7. A quick-drying label flatbed digital printing machine according to claim 2, characterized in that: The machine compartment (2) has an open structure on one side. A sealing door plate (21) is rotatably connected to the open side of the machine compartment (2). An inlet (22) is opened at the bottom of the machine compartment (2) near the paper inlet (11). An outlet (23) is opened at the bottom of the other side of the machine compartment (2). A paper feed roller (27) is rotatably connected inside the inlet (22). A paper output roller (28) is rotatably connected inside the outlet (23). Four ink supply systems (25) are fixed to the inner wall of the machine compartment (2). The ink supply systems (25) are connected to the inkjet head (24). A UV curing lamp (26) is fixed to the inner wall of the machine compartment (2) near the outlet (23). A ring plate (310) is fixed to the surface of the circular plate (31). A ring groove (311) is opened on the surface of the ring plate (310). Two sliding columns (312) are fixed to the side wall of the rotating frame (33). The two sliding columns (312) are slidably connected in the ring groove (311).

8. A quick-drying label flatbed digital printing machine according to claim 7, characterized in that: The paper inlet (11) is rotatably connected to the side wall of the paper feed roller (13), and the end of the paper feed roller (13) is rotatably connected to the first ball bearing (14). The paper take-up outlet (12) is rotatably connected to the side wall of the paper take-up roller (15), and the end of the paper take-up roller (15) is rotatably connected to the second ball bearing (16). The paper inlet (11) is rotatably connected to the first cover plate (125), and the paper take-up outlet (12) is rotatably connected to the second cover plate (126). The first cover plate (125) rolls in contact with the first ball bearing (14), and the second cover plate (126) rolls in contact with the second ball bearing (16). Two first support rollers (17) are rotatably connected to the top surface of the machine body (1) near the paper inlet (11). An n-shaped frame (18) is fixedly attached above the two first support rollers (17). An ion air bar (19) is fixedly sleeved in the middle of the n-shaped frame (18). The inner top surface of the n-shaped frame (18) is rotatably connected to two first fine pressure rollers (121) directly above the two first support rollers (17). The machine body (1) has a first top opening (110) located near the first support roller (17) of the machine compartment (2). The top surface of the machine body (1) has a second top opening (112) located near the inlet (22). The top surface of the machine body (1) has a third top opening (114) located near the outlet (23). The top surface of the machine body (1) is rotatably connected to the feed roller (27) directly below the feed pressure roller. (113), the top surface of the machine body (1) is rotatably connected to the output roller (115) directly below the output pressure roller (28), the top surface of the machine body (1) is rotatably connected to two second support rollers (117) near the paper receiving port (12), the top surface of the machine body (1) is fixed to two support plates (119) on both sides of the two second support rollers (117), the top surface of the two support plates (119) is fixed to a transparent observation plate (120), the two support plates (119) are rotatably connected to two second fine pressure rollers (122) directly above the two second support rollers (117), the machine body (1) is opened at the position of the second support roller (117) near the machine compartment (2) to form a fourth top opening (115). 18) The top surface of the machine body (1) is rotatably connected to multiple third support rollers (127) inside the machine compartment (2). The first transfer roller (111) is rotatably connected to the inside of the machine body (1) near the second top opening (112). The second transfer roller (116) is rotatably connected to the inside of the machine body (1) near the third top opening (114). The paper feeding motor (123) and the paper receiving motor (124) are fixedly connected to the side walls at both ends of the machine body (1). The end of the shaft of the paper feeding motor (123) is fixedly connected to the end of the paper feed roller (13). The end of the shaft of the paper receiving motor (124) is fixedly connected to the end of the paper receiving roller (15). The control computer (128) is fixedly connected to the top surface of the machine body (1) near the machine compartment (2).

9. A printing method using the quick-drying label flatbed digital printing machine as described in claim 8, characterized in that, Includes the following steps: Step 1: Powering on: In the power-off state, the moisturizing cover (48) in the moisturizing mechanism (4) should be placed on the bottom of the inkjet head (24). Before powering on, the electric push rod (415) drives the moisturizing cover (48) to move down away from the inkjet head (24), and then moves it to the top of the vertical section of the L-shaped groove (45). The electric push rod (415) drives the moisturizing cover (48) to move so that it is placed on the side block (421). Then, the paper roll is installed on the feed roller (13) and take-up roller (15), and the power can be turned on. Step 2 Speed ​​Adjustment: After power-on, the third servo geared motor (38) in the tension adjustment component (3) is de-energized and will not lock the rotating frame (33). The rotating frame (33) will generate rotational force under the action of paper feeding. At this time, the small gear (37) on the potentiometer (36) rotates and generates a voltage signal. The voltage intensity is used to determine the position that the rotating frame (33) should be in. Then, the third servo geared motor (38) drives the rotating frame (33) to move to that position. After at least three voltage judgments, the rotating frame (33) is placed in the appropriate position. At the same time, the third servo geared motor (38) is kept energized to lock the position of the rotating frame (33) and complete the tension adjustment. Step 3: The paper passes through the two first support rollers (17) and is destaticated by the ion air bar (19). It then enters the machine compartment (2) and is printed by inkjet printing through the four inkjet heads (24). It is then cured and dried by the UV curing lamp (26) and finally enters the take-up roller (15). Step 4: Shutdown: After the operation is completed, the device stops printing. At this time, the micro pump (413) introduces the moisturizing liquid into the supply chamber (411). The moisturizing liquid overflows from the supply port (412) and soaks the moisturizing wipe (410). The moisturizing wipe (410) absorbs the moisturizing liquid and expands slightly. The pressure plate (424) will have a slight displacement. After the pressure sensor (425) detects the pressure signal applied by the pressure plate (424), it indicates that the moisturizing wipe (410) is sufficiently moistened. At this time, the micro pump (413) stops inputting the moisturizing liquid. The electric push rod (415) drives the moisturizing cover (48) away from the side block (421). The moisturizing cover (48) moves to the end of the horizontal section of the L-shaped groove (45). The electric push rod (415) drives the moisturizing cover (48) to move up and fit on the bottom of the inkjet head (24). Under the action of pressure, the moisturizing liquid in the moisturizing wipe (410) is squeezed into the nozzle end of the inkjet head (24) to achieve moisturization. Then the power is turned off and the machine is shut down.

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