A flattening device and a high speed inkjet system

Abstract

The utility model discloses a kind of flattening device, it is related to the field of printing system, including flattening plate, the bottom of flattening plate is provided with exhaust hole, and at least two suction holes are arranged in the edge position of flattening plate for adsorbing the edge of printing material, suction hole and exhaust hole are all communicated with the inside of flattening plate, negative pressure is manufactured in flattening plate inside, after printing material is adsorbed on flattening plate, the surface of flattening plate is used to flatten printing material, improve the printing quality of the surface of printing material;A high-speed printing system using the flattening device is also disclosed, flattening plate is arranged below adjacent paper guide roller, nozzle is arranged directly above the gap between adjacent paper guide roller, when flattening device adsorbs printing material on the top of flattening plate, nozzle is used to print code on the part of printing material adsorbed on flattening plate, improve the printing quality of high-speed printing system.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing systems, and in particular to a flattening device and a high-speed inkjet printing system utilizing the flattening device. Background Technology

[0002] The flatness of the substrate surface during the printing process affects the printing quality and printing speed. Taking cigarette label printing as an example, the common cigarette label production equipment includes offset printing equipment and gravure printing equipment. In order to improve production efficiency, manufacturers have added high-speed inkjet printing systems to gravure printing equipment. In existing technologies, guide rollers are installed below the substrate, and the installation position of the guide rollers is adjusted to make the surface of the substrate form a certain arc in its direction of movement. The printhead in the high-speed inkjet printing system is positioned directly above the gap between adjacent guide rollers, meaning that the printing area of ​​the printhead is located on the substrate between adjacent guide rollers. However, since the substrate between adjacent guide rollers is not supported by the guide rollers, it cannot return to its original shape, and the flatness of the substrate cannot be guaranteed. At the same time, under the action of the guide rollers, the substrate as a whole presents an arc shape, causing the substrate between adjacent guide rollers to be in a tilted state during printing. When the printhead prints on the substrate, the tilt and original deformation of the substrate cause the cigarette label on the surface of the substrate to deform, thereby reducing the printing quality of the high-speed inkjet printing system. Utility Model Content

[0003] The purpose of this invention is to provide a flattening device and a high-speed inkjet printing system to solve the problems existing in the prior art, ensure the flatness of the substrate, and improve the printing quality of the markings on the substrate surface.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a flattening device, including a hollow flattening plate, a negative pressure tube, and a vacuum machine; The bottom of the printing plate is equipped with an exhaust vent, which is connected to the vacuum machine through a negative pressure pipe. The top of the printing plate is equipped with an air suction vent, with at least two vents. At least two air suction vents are located at the edge of the printing plate to absorb the edge of the substrate. Both the air suction vent and the exhaust vent are connected to the interior of the printing plate.

[0005] In one embodiment, the surface finishing accuracy of the top of the flat panel is 0.01 mm.

[0006] In one embodiment, the system further includes mounting brackets, with at least two mounting brackets, and the mounting brackets are evenly distributed along the circumference of the flat plate.

[0007] In one embodiment, the mounting bracket is provided with a leveling device for adjusting the levelness of the unfolding plate.

[0008] In one embodiment, a pressure regulating switch is provided on the negative pressure pipe.

[0009] In one embodiment, the suction holes include a first suction hole group and a second suction hole group. The first suction hole group is disposed on both sides of the spreading plate corresponding to the edge of the substrate, and the second suction hole group is disposed on the other two sides of the spreading plate.

[0010] In one embodiment, the spacing between adjacent air intake holes in the first air intake hole group is smaller than the spacing between adjacent air intake holes in the second air intake hole group.

[0011] A high-speed inkjet printing system includes a printhead for printing, paper guide rollers, and the aforementioned flattening device. The printhead is positioned directly above the gap between two adjacent paper guide rollers, and a substrate is placed between the printhead and the paper guide rollers. The flattening plate in the flattening device is positioned directly below the printhead and between the two paper guide rollers.

[0012] In one embodiment, multiple paper guide rollers are arranged below the printhead, and the paper guide rollers are arranged along the direction of movement of the substrate. The contact points between all the paper guide rollers and the substrate are located on the same arc line, and the arc line gradually rises and then gradually decreases along the direction of movement of the substrate.

[0013] In one embodiment, there are two nozzles and seven guide rollers, with one nozzle positioned directly above the gap between the second and third guide rollers and the other nozzle positioned directly above the gap between the fifth and sixth guide rollers.

[0014] The present invention achieves the following technical advantages over the prior art: The flattening device includes a hollow flattening plate, a negative pressure pipe, and a vacuum machine. The bottom of the flattening plate has an exhaust vent, which is connected to the vacuum machine via the negative pressure pipe. The top of the flattening plate has at least two suction vents, with at least two located at the edge of the flattening plate to absorb the edge of the substrate. Both the suction and exhaust vents are connected to the interior of the flattening plate. When the vacuum machine is working, a negative pressure is generated inside the flattening plate. Utilizing the pressure difference between the inside and outside of the flattening plate, the outside air presses the substrate onto the surface of the flattening plate, flattening the substrate. Then, the printhead performs inkjet printing on the flattened surface of the substrate, improving printing quality. A high-speed inkjet printing system utilizing the aforementioned flattening device is also disclosed. The flattening device is positioned below adjacent guide rollers. Through the pressure difference between the inside and outside of the flattening plate, the substrate between the adjacent guide rollers is adsorbed onto the top of the flattening plate, keeping the substrate flat. The printhead is positioned directly above the gap between the adjacent guide rollers. When the flattening device adsorbs the substrate onto the top of the flattening plate, the printhead performs inkjet printing on the portion of the substrate adsorbed on the flattening plate, thereby improving the printing quality of the high-speed inkjet printing system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the high-speed inkjet printing system in one embodiment of the present invention; Figure 2 In this utility model Figure 1 Enlarged view of the structure at point A in the middle; Figure 3 This is a schematic diagram of the flattening device in this utility model; Figure 4 This is a schematic diagram of the structure of the flattening plate in the flattening device of this utility model; The components include: 1. printing substrate; 2. vacuum machine; 3. negative pressure tube; 4. pressure regulating switch; 5. spreading plate; 6. mounting bracket; 7. paper guide roller; 8. print head; 9. first suction hole group; and 10. second suction hole group. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The purpose of this invention is to provide a flattening device and a high-speed printing system to solve the problems existing in the prior art, ensure that the substrate is flattened during the printing process, and improve the printing quality by using the flattening device to flatten the substrate in a high-speed printing system.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Please refer to Figures 1 to 4This utility model discloses a flattening device, including a flattening plate 5, a negative pressure pipe 3, and a vacuum machine 2. The interior of the flattening plate 5 is hollow, and an exhaust hole is provided at the bottom of the flattening plate 5. The exhaust hole is connected to the vacuum machine 2 through the negative pressure pipe 3. When the vacuum machine 2 is working, a negative pressure is formed inside the flattening plate 5. An air suction hole is provided at the top of the flattening plate 5. At least two air suction holes are provided, and at least two air suction holes are located at the edge of the flattening plate 5 to adsorb the edge of the substrate 1. Both the air suction hole and the exhaust hole are connected to the interior of the flattening plate 5. After a negative pressure is generated inside the flattening plate 5, under the action of the pressure difference between the inside and outside of the flattening plate 5, outside air enters the interior of the flattening plate 5 through the air suction hole to maintain the air pressure balance inside and outside the flattening plate 5. The substrate 1 located above the flattening plate 5 is tightly adsorbed to the surface of the flattening plate 5 under the action of the pressure difference between the inside and outside of the flattening plate 5. The surface shape of the top of the flattening plate 5 forces the substrate 1 to remain flat.

[0021] The surface processing accuracy of the top of the spreading plate 5 is 0.01mm, which improves the surface smoothness of the top of the spreading plate 5 and avoids scratches on the surface of the substrate 1 after it is adsorbed onto the top surface of the spreading plate 5. At the same time, it improves the geometric and dimensional accuracy of the spreading plate 5, reduces the tilt of the substrate 1 after it is adsorbed onto the spreading plate 5, and ensures that the substrate 1 is in a horizontal state during the printing process.

[0022] The flattening device also includes mounting brackets 6, with no fewer than two mounting brackets 6, and the mounting brackets 6 are evenly arranged along the circumference of the flattening plate 5. The flattening plate 5 is fixed to the printing system by the mounting brackets 6. The level of the flattening device is roughly adjusted by the installation height of the mounting brackets 6 to ensure that the substrate 1 remains horizontal after being adsorbed on the flattening plate 5. Preferably, the mounting bracket 6 is equipped with a leveling device. After the level of the flat plate 5 is roughly adjusted by the mounting bracket 6, the level of the flat plate 5 is further precisely adjusted by the leveling device. The leveling device includes, but is not limited to, gear and rack adjustment method, screw adjustment method, etc.

[0023] Specifically, in the gear and rack adjustment method, a gear is set on the mounting bracket 6, and a manual rotating shaft is set on the rotating shaft of the gear. A vertical rack is set on the mounting bracket 6 on the unfolding plate 5. The rack meshes with the gear. By rotating the gear, the rack moves in the vertical direction, and the rack moves the unfolding plate 5, thereby adjusting the tilt of the unfolding plate 5 so that the unfolding plate 5 achieves the expected parallelism. In the screw adjustment method, a screw is set vertically at the position of the mounting bracket 6 on the spreading plate 5. An adjusting nut is set on the mounting bracket 6. The screw and the adjusting nut are connected by a thread. Rotating the adjusting nut drives the screw to move along its axis, thereby adjusting the tilt of the spreading plate 5 so that the spreading plate 5 achieves the expected parallelism.

[0024] For substrates 1 of different materials, the negative pressure inside the spreading plate 5 is adjusted by the pressure regulating switch 4 set on the negative pressure tube 3 according to the deformability of the material, so as to ensure that the substrate 1 can be adsorbed on the surface of the spreading plate 5.

[0025] During the printing process, the edges of the substrate 1 are prone to flaring due to its own tension. When printing in this area, the substrate 1 deforms, causing the printed code to deform as well. Therefore, the suction holes are divided into a first suction hole group 9 and a second suction hole group 10. The first suction hole group 9 is set on both sides of the spreading plate 5 corresponding to the edges of the substrate 1, and is used to adsorb the edges of the substrate 1, making them stick tightly to the surface of the spreading plate 5. The spreading plate 5 is used to keep the edges of the substrate 1 flat. The second suction hole group 10 is set on the other side of the spreading plate 5. On both sides, the first suction hole group 9 and the second suction hole group 10 ensure that the substrate 1 is subjected to uniform force, so that the substrate 1 can be adsorbed as a whole on the spreading plate 5. Preferably, since the substrate 1 has a wavy edge when it is adsorbed on the spreading plate 5, the deformation of the edge of the substrate 1 is relatively large. Therefore, the distance between adjacent suction holes in the first suction hole group 9 is smaller than the distance between adjacent suction holes in the second suction hole group 10, which increases the force on the edge of the substrate 1 and ensures that the wavy edge phenomenon of the substrate 1 is eliminated.

[0026] When the substrate 1 is a roll of paper, the number of suction holes is set to 136, and the diameter of the suction holes is set to 2mm. The first suction hole group 9 is set at both ends of the spreading plate 5 corresponding to the edge of the roll of paper. In this embodiment, the first suction hole group 9 is arranged in three rows along the movement direction of the roll of paper. The distance between adjacent suction holes in the same row is 20mm, and the distance between suction holes in two adjacent rows is 30mm. A second suction hole group 10 is arranged between the first suction hole groups 9 at both ends of the spreading plate 5. The second suction hole group 10 is arranged in two rows along the movement direction of the roll of paper. The distance between adjacent suction holes in the same row is 20mm, and the distance between the two rows of second suction hole groups 10 is 60mm.

[0027] A high-speed inkjet printing system includes a printhead 8, a paper guide roller 7, and the aforementioned flattening device. The printhead 8 is positioned directly above the gap between two adjacent paper guide rollers 7. The paper guide rollers 7 convey the substrate 1 along a fixed direction. The flattening plate 5 in the flattening device is positioned directly below the printhead 8 and between the two paper guide rollers 7. When the vacuum machine 2 is working, a negative pressure is generated inside the flattening plate 5. Under the action of the pressure difference between the inside and outside of the flattening plate 5, the substrate 1 is adsorbed onto the surface of the flattening plate 5, and the wavy edge phenomenon of the substrate 1 is eliminated under the action of the flattening plate 5. At this time, the printhead 8 prints on the substrate 1 that has been flattened on the surface of the flattening plate 5.

[0028] During the printing process, in order to ensure that the substrate 1 is in a flat state, multiple guide rollers 7 are provided below the printhead 8. The guide rollers 7 are arranged along the movement direction of the substrate 1, and the contact points between all the guide rollers 7 and the substrate 1 are located on the same arc line. The arc line gradually rises and then gradually decreases along the movement direction of the substrate 1, so that the substrate 1 passes through the guide rollers 7 in an arc manner, ensuring that each guide roller 7 can contact the substrate 1, improving the support effect of the guide rollers 7 on the substrate 1, and avoiding deformation after increasing the tension on the substrate 1.

[0029] Preferably, in a high-speed inkjet printing system, there are two printheads 8 and seven paper guide rollers 7. The two printheads 8 are respectively positioned directly above the gap between the second and third paper guide rollers 7 and directly above the gap between the fifth and sixth paper guide rollers 7.

[0030] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0031] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A flattening device, characterized in that, Includes a hollow plate (5), a negative pressure tube (3), and a vacuum machine (2); The bottom of the display plate (5) is provided with an exhaust hole, which is connected to the vacuum machine (2) through the negative pressure pipe (3). The top of the display plate (5) is provided with a suction hole, and the number of suction holes is at least two. At least two suction holes are located at the edge of the display plate (5) to adsorb the edge of the substrate (1). Both the suction hole and the exhaust hole are connected to the interior of the display plate (5).

2. The flattening device according to claim 1, characterized in that, The surface finishing accuracy of the top of the display plate (5) is 0.01 mm.

3. The flattening device according to claim 1, characterized in that, It also includes mounting brackets (6), there are no fewer than two mounting brackets (6), and the mounting brackets (6) are evenly arranged along the circumference of the unfolding plate (5).

4. The flattening device according to claim 3, characterized in that, The mounting bracket (6) is equipped with a horizontal adjustment device for adjusting the levelness of the display plate (5).

5. The flattening device according to claim 1, characterized in that, A pressure regulating switch (4) is provided on the negative pressure pipe (3).

6. The flattening device according to claim 1, characterized in that, The suction holes include a first suction hole group (9) and a second suction hole group (10). The first suction hole group (9) is disposed on both sides of the plate (5) corresponding to the edge of the substrate (1), and the second suction hole group (10) is disposed on the other two sides of the plate (5).

7. The flattening device according to claim 6, characterized in that, The spacing between adjacent air intake holes in the first air intake hole group (9) is smaller than the spacing between adjacent air intake holes in the second air intake hole group (10).

8. A high-speed inkjet printing system, characterized in that, The device includes a printhead (8) for printing, a paper guide roller (7) and a flattening device as described in any one of claims 1 to 7, wherein the printhead (8) is disposed directly above the gap between two adjacent paper guide rollers (7), a substrate (1) is disposed between the printhead (8) and the paper guide roller (7), and the flattening plate (5) in the flattening device is disposed directly below the printhead (8) and between the two paper guide rollers (7).

9. The high-speed inkjet printing system according to claim 8, characterized in that, Multiple paper guide rollers (7) are arranged below the nozzle (8). The paper guide rollers (7) are arranged along the movement direction of the substrate (1), and all the paper guide rollers (7) are in contact with the substrate (1) on the same arc line. The arc line gradually rises and then gradually decreases along the movement direction of the substrate (1).

10. The high-speed inkjet printing system according to claim 9, characterized in that, There are two nozzles (8) and seven paper guide rollers (7). One nozzle (8) is located directly above the gap between the second and third paper guide rollers (7), and the other nozzle (8) is located directly above the gap between the fifth and sixth paper guide rollers (7).

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