Tension adjusting structure of a gravure printing machine
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANG XI ZHEN LONG COLOR PRINTING & PACKING CO LTD
- Filing Date
- 2024-02-02
- Publication Date
- 2026-05-26
Smart Images
Figure CN117775831B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gravure printing technology, and in particular to a tension adjustment structure for a gravure printing machine. Background Technology
[0002] Cigarette packaging printing is characterized by full background colors, numerous spot colors, simple designs, and few continuous-tone patterns. Visually, it needs to be highly appealing or visually impactful to stimulate consumers' desire to purchase. The printing content on cigarette packs mainly includes solid colors, lines, halftone images, ordinary text, and non-continuous-tone patterns. In addition, anti-counterfeiting measures, embossing, hot stamping, and die-cutting are also commonly used processes in cigarette pack printing. To adapt to the content and characteristics of cigarette pack printing, cigarette packaging printing requires high-precision printing methods with strong color expression, such as gravure printing and flexographic printing. Gravure printing, in particular, has the advantages of thick ink layers and stable ink colors, making it suitable for printing large areas of solid colors, spot colors, gold and silver colors, and pearlescent colors. At the same time, gravure printing also boasts high printing efficiency and good print quality. Therefore, gravure printing has become the main printing method for cigarette packs.
[0003] When processing rolled paper, it needs to be unrolled. In gravure printing, the paper needs to be stretched to facilitate processing with the gravure printing equipment. However, since the thickness of each section of the paper is different, the uneven thickness of the paper can easily cause stretching changes when the paper roll is unrolled and stretched. This can lead to color differences, offsets, and unclear patterns on the surface of the paper after gravure printing. Therefore, a tension adjustment structure for a gravure printing machine is provided to solve the above problems. Summary of the Invention
[0004] This invention provides a tension adjustment structure for a gravure printing machine to solve the aforementioned technical problems.
[0005] The present invention adopts the following technical solution: including a frame, a material guiding assembly and a tension adjusting assembly. The frame is the internal support structure of the paper conveying equipment matched with the gravure printing machine. The inlet and outlet are respectively provided on both sides of the frame. The material guiding assembly is located on the front side of the frame. The tension adjusting assembly is set on the frame and located above the material guiding assembly. The unwinding roller group is set above the tension adjusting assembly.
[0006] Preferably, the material guiding assembly includes a first feed guide roller, a second feed guide roller, and a discharge guide roller. The first feed guide roller, the second feed guide roller, and the discharge guide roller are all horizontally positioned on the front side of the frame. The first feed guide roller is located near the feed inlet, and its bottom end is rotatably connected to the frame. The discharge guide roller is located near the discharge outlet. The second feed guide roller is located between the first feed guide roller and the discharge guide roller, and its position is adjacent to the discharge guide roller. The assembly is located on the rear side of the frame, and corresponding to the positions of the second feed guide roller and the discharge guide roller, are respectively provided with... The corresponding drive mechanism has its output end passing through the frame and fixedly connected to the bottom ends of the corresponding second feed guide roller and discharge guide roller. Under the operation of the drive mechanism, the second feed guide roller will guide the paper to continuously feed it onto the tension adjustment assembly and the unwinding roller assembly. The first feed guide roller can provide support and guidance for the paper between the feed inlet and the second feed guide roller. Under the operation of the corresponding drive mechanism, the discharge guide roller can transport the tension-adjusted paper to the discharge outlet.
[0007] Preferably, the tension adjustment assembly includes an adjustment roller and a lifting mechanism. A through groove is provided on the frame. The adjustment roller is placed horizontally in the through groove. The lifting mechanism is located on the rear side of the frame, and its position is adjacent to the upper part of the through groove. An adjustment plate is provided below the lifting mechanism. The adjustment plate is placed horizontally in the through groove of the frame, and the adjustment plate slides vertically with the frame parts on both sides of the through groove. The adjustment plate is fixedly connected to the output end of the lifting mechanism, and the bottom end of the adjustment roller is rotatably connected to the adjustment plate.
[0008] Preferably, a guide roller is provided on both sides of the adjusting roller, each guide roller is placed horizontally on the front side of the frame, and the bottom end of each guide roller is rotatably connected to the frame.
[0009] As the adjusting roller descends, it stretches the paper between the two guide rollers, stretching the thicker parts of the paper to change its tension. The bottom of the adjusting roller is rotatably connected to the adjusting plate, which allows the adjusting roller to provide a guiding function for the paper tension adjustment process when it comes into contact with the paper, thus avoiding the paper breakage caused by excessive friction when the adjusting roller is in a fixed state.
[0010] Preferably, the unwinding roller group consists of multiple unwinding guide rollers, which are arranged in pairs on the frame from top to bottom. Each unwinding guide roller is rotatably connected to the frame. An unwinding drive roller is located at the top of the multiple unwinding guide rollers. A drive mechanism matching the position of the unwinding drive roller is located on the rear side of the frame. The output end of the drive mechanism passes through the frame and is fixedly connected to the bottom end of the unwinding drive roller. The multiple unwinding guide rollers in the row near the left side of the frame expand from top to bottom towards the left side of the frame, while the multiple unwinding guide rollers in the row near the right side of the frame expand from top to bottom towards the right side of the frame.
[0011] After the tension adjustment component adjusts the tension of the paper, the surface of the paper will be unstable due to the stretching. The multiple unwinding guide rollers can extend the conveying distance of the paper to the discharge port and perform a shaping treatment in a taut state for the paper after tension adjustment, so as to avoid the phenomenon of surface springback when the paper is immediately put into subsequent processing after being stretched.
[0012] Preferably, an auxiliary conveying assembly is provided below the adjusting roller. The auxiliary conveying assembly includes a base plate, a lifting plate, and a conveying roller. The base plate is horizontally positioned below the through-slot on the front side of the frame, and its rear side is fixedly connected to the frame. A lifting mechanism is provided on the base plate, with its bottom mounted on the base plate. The lifting plate is horizontally positioned above the lifting mechanism, and its bottom is fixedly connected to the output end of the lifting mechanism. A support plate is vertically positioned on the lifting plate, with its bottom fixedly connected to the lifting plate. The conveying roller is horizontally positioned directly below the adjusting roller. A transmission belt and two transmission wheels are provided on the support plate. All the driving wheels are rotatably connected to the support plate. One of the driving wheels is located at the corresponding position of the conveyor roller, and the front part of the driving wheel is fixedly connected to the bottom end of the conveyor roller. The other driving wheel is located below the conveyor roller. The transmission belt is sleeved on the two driving wheels. A drive mechanism is set at the rear part of the support plate. The output end of the drive mechanism passes through the support plate and is connected to the driving wheel located below the conveyor roller. When the paper is tensioned, the paper below the adjustment roller is conveyed by the conveyor roller to provide a conveying function during the tension adjustment process, so as to avoid the paper being damaged due to excessive friction when it comes into contact with the adjustment roller.
[0013] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects:
[0014] After the paper is assembled with the feeding assembly, tension adjustment assembly, and unwinding roller assembly, the tension adjustment assembly can stretch the paper to adjust its tension and prevent color differences, offsets, or unclear patterns on the surface of the paper during gravure printing. The unwinding roller assembly and unwinding drive roller can then perform a taut shaping process on the tension-adjusted paper to prevent the paper from immediately being fed into subsequent processing after being stretched, which could cause surface rebound and thus prevent unclear patterns such as pattern splitting during subsequent gravure printing. Attached Figure Description
[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:
[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;
[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;
[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ;
[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 4 ;
[0020] Figure 5 This is a three-dimensional structural diagram of the tension adjustment component in this invention;
[0021] Figure 6 This is a three-dimensional structural diagram of the auxiliary conveying component in this invention;
[0022] Figure 7 This is a schematic diagram of the first state structure of the tension adjustment component and the auxiliary conveying component in this invention;
[0023] Figure 8 This is a schematic diagram of the second state structure of the tension adjustment component and the auxiliary conveying component in this invention.
[0024] Figure Labels
[0025] Frame 1, feed inlet 11, discharge outlet 12, through slot 13, material guiding component 2, first feed guiding roller 21, second feed guiding roller 22, discharge guiding roller 23, driving mechanism 24, tension adjusting component 3, adjusting roller 31, lifting mechanism 32, adjusting plate 33, guiding roller 34, unwind roller group 4, unwind guiding roller 41, unwind driving roller 42, auxiliary conveying component 5, bottom plate 51, lifting plate 52, conveying roller 53, support plate 54, transmission belt 55, transmission wheel 56. Specific embodiments
[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
[0027] The following will detail the technical solutions provided by each embodiment of the present invention in conjunction with the drawings.
[0028] An embodiment of the present invention provides a gravure press tension adjustment structure, including a frame 1, a material guiding component 2, and a tension adjusting component 3. The frame 1 is a support structure inside the paper conveying device matching the gravure press. A feed inlet 11 and a discharge outlet 12 are respectively arranged on both sides of the frame 1. The material guiding component 2 is located on the front side of the frame 1. The tension adjusting component 3 is arranged on the frame 1 and is located above the material guiding component 2. An unwind roller group 4 is arranged above the tension adjusting component 3.
[0029] In a further embodiment, the material guiding component 2 includes a first feed guiding roller 21, a second feed guiding roller 22, and a discharge guiding roller 23. The first feed guiding roller 21, the second feed guiding roller 22, and the discharge guiding roller 23 are all horizontally arranged on the front side of the frame 1. The position of the first feed guiding roller 21 is adjacent to the feed inlet 11, and the bottom end of the first feed guiding roller 21 is rotatably connected to the frame 1. The discharge guiding roller 23 is adjacent to the discharge outlet 12. The second feed guiding roller 22 is located between the first feed guiding roller 21 and the discharge guiding roller 23, and the position of the second feed guiding roller 22 is adjacent to the discharge guiding roller 23. Driving mechanisms 24 are respectively arranged on the rear side of the frame 1 corresponding to the second feed guiding roller 22 and the discharge guiding roller 23. The output ends of the driving mechanisms 24 pass through the frame 1 and are respectively fixedly connected to the bottom ends of the corresponding second feed guiding roller 22 and the discharge guiding roller 23. When in use, refer to the attached Figure 2 and the attached Figure 3As shown, one end of the paper is pulled from the feed inlet 11 to the upper part of the first feed guide roller 21, then covered by the lower left part of the second feed guide roller 22. The paper then passes through the tension adjustment component 3 and the unwinding roller group 4 in sequence, and finally is pulled to the lower part of the discharge guide roller 23 and pulled out from the discharge port 12 on the frame 1, thus completing the initial assembly of the paper. Under the operation of the drive mechanism 24 corresponding to the second feed guide roller 22, the second feed guide roller 22 will carry out the conveying and guiding work of the paper, so that the paper can be continuously conveyed onto the tension adjustment component 3 and the unwinding roller group 4. The first feed guide roller 21 can provide support and guidance for the paper between the feed inlet 11 and the second feed guide roller 22 to prevent the paper from falling between the feed inlet 11 and the second feed guide roller 22. Under the operation of the drive mechanism 24 corresponding to the discharge guide roller 23, the discharge guide roller 23 can carry the tension-adjusted paper to the discharge port 12.
[0030] In a further embodiment, the tension adjustment assembly 3 includes an adjustment roller 31 and a lifting mechanism 32. A through groove 13 is provided on the frame 1. The adjustment roller 31 is horizontally placed in the through groove 13. The lifting mechanism 32 is located on the rear side of the frame 1, and its position is adjacent to the upper part of the through groove 13. An adjustment plate 33 is provided below the lifting mechanism 32. The adjustment plate 33 is horizontally placed in the through groove 13 of the frame 1, and the adjustment plate 33 slides vertically with the frame 1 parts on both sides of the through groove 13. The adjustment plate 33 is fixedly connected to the output end of the lifting mechanism 32, and the bottom end of the adjustment roller 31 is rotatably connected to the adjustment plate 33.
[0031] A guide roller 34 is provided on both sides of the adjusting roller 31. Each guide roller 34 is horizontally positioned at the front of the frame 1, and the bottom end of each guide roller 34 is rotatably connected to the frame 1. (See attached figure) Figure 2 and attached Figure 3 As shown, after the paper is covered by the second feed guide roller 22, it can be pulled onto a guide roller 34 located to the left of the adjusting roller 31, and then pulled and covered by the upper left surface of the guide roller 34 to the lower part of the adjusting roller 31. Then it is covered by the lower right surface of another guide roller 34 and pulled to the unwinding roller group 4, thus completing the assembly of the paper with the tension adjusting component 3 and the guide roller 34.
[0032] Among them, a detection device for the change of paper tension is installed on the frame 1. During the paper conveying process, the lifting mechanism 32 can drive the adjusting plate 33 and the adjusting roller 31 to descend slowly. While the adjusting roller 31 is descending, it will stretch the paper between the two guide rollers 34, so that the thicker part of the paper is stretched, thereby changing the tension of the paper.
[0033] Secondly, the bottom end of the adjusting roller 31 is rotatably connected to the adjusting plate 33, which allows the adjusting roller 31 to provide a conveying and guiding function for the tension adjustment of the paper when it comes into contact with the paper, so as to avoid the paper being damaged due to the huge friction force generated by the adjusting roller 31 when it is in a fixed state. In actual operation, the lifting mechanism 32 corresponding to the adjusting roller 31 can be controlled according to the tension detection of the paper by the detection equipment, so as to control the lifting distance of the adjusting roller 31 and perform tension adjustment according to the thickness of the paper.
[0034] In a further embodiment, the unwinding roller group 4 is composed of multiple unwinding guide rollers 41, which are arranged in pairs on the frame 1 from top to bottom. Each unwinding guide roller 41 is rotatably connected to the frame 1. An unwinding drive roller 42 is provided at the top of the multiple unwinding guide rollers 41. A drive mechanism 24 matching the position of the unwinding drive roller 42 is provided at the rear side of the frame 1. The output end of the drive mechanism 24 passes through the frame 1 and is fixedly connected to the bottom end of the unwinding drive roller 42.
[0035] See attached document Figure 3 As shown, multiple unwinding guide rollers 41 in the row near the left side of the frame 1 are arranged from top to bottom in a direction that expands towards the left side of the frame 1, while multiple unwinding guide rollers 41 in the row near the right side of the frame 1 are arranged from top to bottom in a direction that expands towards the right side of the frame 1. After the paper is covered by the two guide rollers 34, it can be pulled from bottom to top to cover the outer surface of the multiple unwinding guide rollers 41 in the row on the right side of the frame 1. Then, it is covered above the unwinding drive roller 42 and pulled to the lower left of the unwinding drive roller 42, so that the paper covers the outer surface of the multiple unwinding guide rollers 41 in the row on the left side of the frame 1 from top to bottom. Finally, it is pulled from below the discharge guide roller 23 to the discharge port 12, thus completing the assembly work when adjusting the tension of the entire paper.
[0036] After the tension adjustment component 3 adjusts the tension of the paper, the surface of the paper will be unstable due to stretching. The multiple unwinding guide rollers 41 can extend the conveying distance of the paper to the discharge port 12 and perform a shaping process in a taut state for the paper after tension adjustment, so as to avoid the phenomenon of surface rebound when the paper is immediately put into subsequent processing after being stretched. The multiple unwinding guide rollers 41 arranged on the left and right sides of the frame 1 expand to both sides of the frame 1, which can increase the distance of paper conveying. The drive mechanism 24 provided at the corresponding position of the unwinding drive roller 42 can provide rotational driving force for the unwinding drive roller 42, so that the unwinding drive roller 42 can provide a conveying function for the paper covered on the multiple unwinding guide rollers 41, so that the paper can be smoothly transferred on the multiple unwinding guide rollers 41 during the shaping process.
[0037] In a further embodiment, an auxiliary conveying assembly 5 is provided below the adjusting roller 31. The auxiliary conveying assembly 5 includes a base plate 51, a lifting plate 52, and a conveying roller 53. The base plate 51 is horizontally positioned below the front through groove 13 of the frame 1, and the rear side of the base plate 51 is fixedly connected to the frame 1. A lifting mechanism 32 is provided on the base plate 51, with its bottom mounted on the base plate 51. The lifting plate 52 is horizontally positioned above the lifting mechanism 32, and its bottom is fixedly connected to the output end of the lifting mechanism 32. A support plate 54 is vertically provided on the lifting plate 52, and the bottom of the support plate 54 is connected to the lifting plate 52. 2. A fixed connection is formed. The conveying roller 53 is horizontally positioned directly below the adjusting roller 31. A transmission belt 55 and two transmission wheels 56 are provided on the support plate 54. Both transmission wheels 56 are rotatably connected to the support plate 54. One transmission wheel 56 is located at the corresponding position of the conveying roller 53, and its front part is fixedly connected to the bottom end of the conveying roller 53. The other transmission wheel 56 is located below the conveying roller 53. The transmission belt 55 is sleeved on the two transmission wheels 56. A drive mechanism 24 is provided at the rear side of the support plate 54. The output end of the drive mechanism 24 passes through the support plate 54 and is connected to the transmission wheel 56 located below the conveying roller 53.
[0038] When the paper is tensioned, the conveyor roller 53 gradually approaches the adjusting roller 31 under the drive of the corresponding lifting mechanism 32, and is adjusted according to the lifting height of the adjusting roller 31. When the conveyor roller 53 and the adjusting roller 31 work together to clamp the paper from top to bottom, the corresponding driving mechanism 24 drives the transmission wheel 56 to rotate, so that the corresponding transmission wheel 56 drives the transmission belt 55 and another transmission wheel 56 to rotate synchronously, so that the conveyor roller 53 also rotates, thereby conveying the paper below the adjusting roller 31. This provides a conveying function during the tension adjustment process of the paper, so as to avoid the paper being damaged due to excessive friction when it comes into contact with the adjusting roller 31.
[0039] In a further embodiment, the lifting mechanism 32 may be a lifting device with up-and-down lifting driving force, such as an electric push cylinder, and the driving mechanism 24 may be a driving device with rotation driving force, such as a servo motor. Both the lifting mechanism 32 and the driving mechanism 24 are controlled by a corresponding control unit.
[0040] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.
Claims
1. A tension adjustment structure for a gravure printing machine, characterized in that, include: The frame (1) is the internal support structure of the paper conveying equipment that is matched with the gravure printing machine. The feed inlet (11) and the discharge outlet (12) are respectively located on both sides of the frame (1). Material guiding assembly (2), which is located on the front side of frame (1); The tension adjustment component (3) is mounted on the frame (1) and located above the material guide component (2); An unwinding roller assembly (4) is provided above the tension adjustment assembly (3); The tension adjustment assembly (3) includes an adjustment roller (31) and a lifting mechanism (32). A through groove (13) is provided on the frame (1). The adjustment roller (31) is horizontally placed in the through groove (13). The lifting mechanism (32) is located on the rear side of the frame (1) and is positioned above the through groove (13). An adjustment plate (33) is provided below the lifting mechanism (32). The adjustment plate (33) is horizontally placed in the through groove (13) of the frame (1). The adjustment plate (33) slides vertically with the frame (1) on both sides of the through groove (13). The adjustment plate (33) is fixedly connected to the output end of the lifting mechanism (32). The bottom end of the adjustment roller (31) is rotatably connected to the adjustment plate (33). An auxiliary conveying assembly (5) is provided below the adjusting roller (31). The auxiliary conveying assembly (5) includes a base plate (51), a lifting plate (52), and a conveying roller (53). The base plate (51) is horizontally positioned below the front through groove (13) of the frame (1). The rear side of the base plate (51) is fixedly connected to the frame (1). A lifting mechanism (32) is provided on the base plate (51). The bottom of the lifting mechanism (32) is mounted on the base plate (51). The lifting plate (52) is horizontally positioned above the lifting mechanism (32), and the bottom of the lifting plate (52) is fixedly connected to the output end of the lifting mechanism (32). A support plate (54) is vertically positioned on the lifting plate (52). The bottom of the support plate (54) is perpendicular to the lifting plate (52). The conveying roller (53) is horizontally positioned directly below the adjusting roller (31). A transmission belt (55) and two transmission wheels (56) are provided on the support plate (54). Both transmission wheels (56) are rotatably connected to the support plate (54). One transmission wheel (56) is located at the corresponding position of the conveying roller (53), and the front part of the transmission wheel (56) is fixedly connected to the bottom end of the conveying roller (53). The other transmission wheel (56) is located below the conveying roller (53). The transmission belt (55) is sleeved on the two transmission wheels (56). A drive mechanism (24) is provided at the rear part of the support plate (54). The output end of the drive mechanism (24) passes through the support plate (54) and is connected to the transmission wheel (56) located below the conveying roller (53).
2. The tension adjustment structure for a gravure printing machine according to claim 1, characterized in that, The material guiding assembly (2) includes a first feed guide roller (21), a second feed guide roller (22), and a discharge guide roller (23). The first feed guide roller (21), the second feed guide roller (22), and the discharge guide roller (23) are all horizontally positioned on the front side of the frame (1). The first feed guide roller (21) is located near the feed inlet (11), and its bottom end is rotatably connected to the frame (1). The discharge guide roller (23) is located near the discharge outlet (12). The second feed guide roller (23) is located near the discharge outlet (12). The material guide roller (22) is located between the first feed guide roller (21) and the discharge guide roller (23), and the second feed guide roller (22) is located adjacent to the discharge guide roller (23). It is located on the rear side of the frame (1) and a matching drive mechanism (24) is provided for the second feed guide roller (22) and the discharge guide roller (23) respectively. The output end of the drive mechanism (24) passes through the frame (1) and is fixedly connected to the bottom end of the corresponding second feed guide roller (22) and discharge guide roller (23).
3. The tension adjustment structure for a gravure printing machine according to claim 1, characterized in that, A guide roller (34) is provided on both sides of the adjusting roller (31). Each guide roller (34) is placed horizontally on the front side of the frame (1), and the bottom end of each guide roller (34) is rotatably connected to the frame (1).
4. The tension adjustment structure for a gravure printing machine according to claim 1, characterized in that, The unwinding roller group (4) consists of multiple unwinding guide rollers (41). The multiple unwinding guide rollers (41) are arranged in pairs on the frame (1) from top to bottom. Each unwinding guide roller (41) is rotatably connected to the frame (1). An unwinding drive roller (42) is provided at the top of the multiple unwinding guide rollers (41). A drive mechanism (24) matching the position of the unwinding drive roller (42) is provided on the rear side of the frame (1). The output end of the drive mechanism (24) passes through the frame (1) and is fixedly connected to the bottom end of the unwinding drive roller (42).
5. The tension adjustment structure for a gravure printing machine according to claim 4, characterized in that, Multiple unwinding guide rollers (41) in a row near the left side of the frame (1) are arranged in an expanding direction towards the left side of the frame (1) from top to bottom, while multiple unwinding guide rollers (41) in a row near the right side of the frame (1) are arranged in an expanding direction towards the right side of the frame (1) from top to bottom.