A device for improving the flatness of a windowed security thread

Abstract

The application provides a device for improving the flatness of windowed security thread paper, and relates to the paper processing technical field.The device for improving the flatness of windowed security thread paper is provided with a pressure connection mechanism, in the paper conveying process, a first air cylinder is used to drive a swing arm to swing, a pressure roller is used to locally flatten the security thread area of the paper, so that the thickness difference between the security thread area and the non-security thread area is effectively reduced, and the flatness of the whole paper is significantly improved.In addition, an elastic element is arranged, when the first air cylinder returns, the elastic element can automatically reset and drive the swing arm to swing back, so that the pressure roller timely moves away from the paper, which is beneficial to ensuring the smoothness of the continuous paper conveying process when pressure is not needed, avoiding interference to the paper running, and improving the working reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of paper processing technology, and in particular to a device for improving the flatness of paper with a windowed safety line. Background Technology

[0002] In the production of paper with windowed security threads, due to the forming process and the embedding method of the security threads, a significant thickness difference often exists between the windowed security thread area and the non-security thread area. Specifically, the presence of the security thread can cause localized protrusions or uneven structures, resulting in an uneven overall thickness distribution of the paper and affecting its flatness. When this uneven thickness is significant, it can easily lead to a series of problems in subsequent processing. For example, during paper stacking, localized protrusions can cause uneven stacking, affecting stacking stability; during printing, it may cause defects such as reduced print quality. Therefore, how to improve the uneven thickness problem in the windowed security thread area and enhance the overall flatness of the paper has become a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0003] One object of the present invention is to provide an apparatus for improving the flatness of paper with a windowed security thread, thereby solving the technical problem of uneven thickness in the windowed security thread area in the prior art.

[0004] In particular, the present invention provides an apparatus for improving the flatness of paper with a windowed security thread, comprising: The roller is configured to be rotatable to feed paper in a preset rotation direction; Multiple pressing mechanisms are provided, each including a swing arm, an elastic element, a pressure roller, and a first cylinder. The swing arm is rotatably configured, and the pressure roller and the elastic element are respectively connected to both ends of the swing arm. In the working state, driven by the first cylinder, the swing arm swings, thereby driving the pressure roller to move along a first horizontal direction to apply pressure to the safety line area of ​​the paper, thereby reducing the thickness of the safety line area. At this time, the elastic element is in a compressed state. In the non-working state, the first cylinder removes the applied pressure, the elastic element returns to its original state, causing the swing arm to return to its original position, thereby driving the pressure roller away from the paper.

[0005] Optionally, the number of the pressing mechanisms is two, and the pressure rollers of the two pressing mechanisms sequentially apply pressure to the safety line area of ​​the paper.

[0006] Optionally, the width of the pressure roller is the same as the width of the safety line area.

[0007] Optionally, it also includes: Mounting plate, the first cylinders of the plurality of pressing mechanisms are mounted on the mounting plate, and one end of the elastic member is connected to the mounting plate and the other end is connected to the swing arm; the middle area of ​​the swing arm is rotatably connected to the mounting plate.

[0008] Optionally, it also includes: A slide rail is arranged along a second horizontal direction, and the mounting plate is slidably mounted on the slide rail and can move along the slide rail, wherein the second horizontal direction is perpendicular to the first horizontal direction.

[0009] Optionally, it also includes: Second cylinder; A movable crossbeam is mounted on the second cylinder, and the slide rail is mounted on the movable crossbeam. Driven by the second cylinder, the movable crossbeam can move along the first horizontal direction, thereby driving the movable crossbeam, the mounting plate, and the plurality of pressing mechanisms to move along the first horizontal direction.

[0010] Optionally, it also includes: A locking mechanism, installed on the movable crossbeam, is used to lock the movable crossbeam when the second cylinder drives it to the target position; the pressure roller of the pressing mechanism applies pressure to the safety line area of ​​the paper after the movable crossbeam is locked.

[0011] Optionally, the movable crossbeam is provided with a first pin hole, and the locking mechanism includes: The bracket has a second pin hole; A locking cylinder is mounted on the bracket and has a pin connected to its end; When the moving crossbeam moves to the target position, the first pin hole and the second pin hole are aligned, and the locking cylinder drives the pin to insert into the first pin hole and the second pin hole, thereby locking the moving crossbeam.

[0012] Optionally, it also includes: A pneumatic control system, connected to the first cylinder and the second cylinder, is used to control the air intake and movement of the first cylinder and the second cylinder.

[0013] Optionally, the pneumatic control system includes: A reversing valve is used to control the extension and retraction of the pressure roller; A proportional valve is used to regulate the air pressure entering the first cylinder, so as to regulate the clamping force of the pressure roller on the safety line area.

[0014] The device for improving the flatness of paper with a windowed safety line provided by the present invention uses a pressing mechanism to drive the swing arm to swing during the paper conveying process, so that the pressure roller locally flattens the safety line area of ​​the paper, thereby effectively reducing the thickness difference between the safety line area and the non-safety line area and significantly improving the overall flatness of the paper.

[0015] Furthermore, by setting up an elastic element, the elastic element can automatically reset and drive the swing arm to swing back when the first cylinder returns, so that the pressure roller moves away from the paper in time. When pressure is not required, this helps to ensure the smoothness of the continuous paper conveying process, avoids interference with the paper operation, and improves the working reliability of the device.

[0016] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0017] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of a device for improving the flatness of paper with a windowed security thread according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic enlarged view of part A in the middle; Figure 3 This is a schematic structural diagram of a movable crossbeam and locking mechanism according to an embodiment of the present invention.

[0018] Figure label: 100-Device, 200-Paper, 10-Roller, 20-Crimping mechanism, 30-Second cylinder, 40-Locking mechanism, 50-Moving crossbeam, 60-Slide rail, 70-Mounting plate, 21-Pressure roller, 22-Swing arm, 23-First cylinder, 24-Elastic element, 41-Locking cylinder, 42-Pin, 51-First pin hole, 81-Second pin hole, 82-Column, 83-Bracket. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0022] Unless otherwise expressly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] Figure 1 This is a schematic structural diagram of a device 100 for improving the flatness of windowed security thread paper 200 according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic enlarged view of part A. (See diagram below.) Figures 1 to 2As shown, in a specific embodiment, the device 100 for improving the flatness of paper with a windowed safety line includes a roller 10 and a plurality of pressing mechanisms 20. The roller 10 is rotatably configured to convey paper 200 along a preset rotation direction. Each pressing mechanism 20 includes a swing arm 22, an elastic element 24, a pressure roller 21, and a first cylinder 23. The swing arm 22 is rotatably configured, and the pressure roller 21 and the elastic element 24 are respectively connected to both ends of the swing arm 22. In the working state, driven by the first cylinder 23, the swing arm 22 swings, thereby driving the pressure roller 21 to move along a first horizontal direction to press the safety line area of ​​the paper 200, thereby reducing the thickness of the safety line area. At this time, the elastic element 24 is in a compressed state. In the non-working state, the first cylinder 23 releases the pressure, the elastic element 24 returns to its original state, causing the swing arm 22 to return to its original position, thereby driving the pressure roller 21 away from the paper 200. Here, when the pressure roller 21 presses the paper 200, the pressure roller 21 also rotates under the drive of the roller 10. A rolling bearing is installed in the center of the pressure roller 21, and the two edges are rounded.

[0025] This embodiment sets up a pressing mechanism 20, which uses the first cylinder 23 to drive the swing arm 22 to swing during the paper 200 conveying process, so that the pressure roller 21 locally flattens the safety line area of ​​the paper 200, thereby effectively reducing the thickness difference between the safety line area and the non-safety line area and significantly improving the overall flatness of the paper 200.

[0026] Furthermore, in this embodiment, the elastic element 24 can automatically reset and drive the swing arm 22 to swing back when the first cylinder 23 returns, so that the pressure roller 21 moves away from the paper 200 in time. This helps to ensure the smoothness of the continuous conveying process of the paper 200 when no pressure is needed, avoids interference with the operation of the paper 200, and improves the working reliability of the device 100.

[0027] In some embodiments, there are two crimping mechanisms 20, and the pressure rollers 21 of the two crimping mechanisms 20 sequentially apply pressure to the safety line area of ​​the paper 200. Specifically, the two crimping mechanisms 20 are arranged in the vertical direction.

[0028] This embodiment sets the number of pressing mechanisms 20 to two, and has the pressure rollers 21 of the two pressing mechanisms 20 sequentially press the safety line area along the paper 200 conveying direction. This allows for segmented and continuous flattening of the safety line area, which, compared to single pressing, further improves the uniformity and stability of the flattening effect and enhances the overall flatness of the paper 200. It can be understood that the two pressure rollers 21 press the same safety line area, and each safety line area requires two presses.

[0029] In some embodiments, the width of the pressure roller 21 is consistent with the width of the safety line area, so that the effective range of the pressure roller 21 matches the safety line area, thereby enabling precise pressure to be applied to the safety line area, avoiding unnecessary compression deformation to the non-safety line area, and helping to ensure the integrity of the overall structure of the paper 200.

[0030] In some embodiments, the device 100 further includes a mounting plate 70, on which the first cylinders 23 of the plurality of pressing mechanisms 20 are mounted, and one end of the elastic member 24 is connected to the mounting plate 70, and the other end is connected to the swing arm 22. The middle region of the swing arm 22 is rotatably connected to the mounting plate 70. Here, the middle position of the swing arm 22 is provided with a mounting hole, and it is mounted on the mounting plate 70 by a mounting pin.

[0031] This embodiment sets up a mounting plate 70 and installs the first cylinders 23 of multiple pressing mechanisms 20 on the mounting plate 70. At the same time, elastic members 24 are connected between the mounting plate 70 and the swing arm 22 respectively, and the swing arm 22 is installed on the mounting plate 70 by rotation. This enables the integrated installation and unified support of multiple pressing mechanisms 20, improves the structural stability and installation convenience of the device 100, and helps to ensure the consistency of the operation of each pressing mechanism 20.

[0032] In some embodiments, the device 100 further includes a slide rail 60 arranged along a second horizontal direction. A mounting plate 70 is slidably mounted on the slide rail 60 and is movable along the slide rail 60. The second horizontal direction is perpendicular to the first horizontal direction. Specifically, the mounting plate 70 is mounted on a slider, and the slider is slidably connected to the slide rail 60. When the mounting plate 70 is moved into place, the slider and the slide rail 60 can be fixed by locking bolts.

[0033] This embodiment, by providing a slide rail 60 arranged along a second horizontal direction and allowing the mounting plate 70 to move along the slide rail 60, enables adjustment of the position of the pressing mechanism 20 in the second horizontal direction to accommodate papers 200 with different safety line positions, thereby improving the adaptability and adjustment flexibility of the device 100. In other words, each pressure roller 21 can be adjusted along the slide rail 60 according to the position of the windowed safety line and fixed by locking bolts.

[0034] In some embodiments, the device 100 further includes a second cylinder 30 and a movable crossbeam 50, the movable crossbeam 50 being mounted on the second cylinder 30, and a slide rail 60 being mounted on the movable crossbeam 50; driven by the second cylinder 30, the movable crossbeam 50 can move along a first horizontal direction, thereby driving the movable crossbeam 50, the mounting plate 70, and the plurality of pressing mechanisms 20 to move along the first horizontal direction. Here, the slide rail 60 is fixed on the movable crossbeam 50, and the fixed position is parallel to the center line of the roller 10. Here, the second cylinder 30 is a rodless cylinder. In some embodiments, there are two second cylinders 30, and the two second cylinders 30 are mounted at both ends of the movable crossbeam 50.

[0035] This embodiment, by setting a second cylinder 30 and a moving crossbeam 50, and mounting a slide rail 60 on the moving crossbeam 50, allows the moving crossbeam 50 and its pressing mechanism 20 to move as a whole along a first horizontal direction under the drive of the second cylinder 30. This enables the position adjustment of the pressing mechanism 20 in the first horizontal direction, allowing it to be pushed to or away from the working position. Specifically, when in the paper-feeding state, the second cylinder 30 drives the moving crossbeam 50 and the pressing mechanism 20 as a whole away from the working position, i.e., away from the roller 10.

[0036] In some embodiments, the device 100 further includes a locking mechanism 40, which is mounted on the movable crossbeam 50 and is used to lock the movable crossbeam 50 when the second cylinder 30 drives the movable crossbeam 50 to the target position; the pressure roller 21 of the pressing mechanism 20 applies pressure to the safety line area of ​​the paper 200 after the movable crossbeam 50 is locked.

[0037] This embodiment uses a locking mechanism 40 to lock the moving crossbeam 50 after it moves to the target position, thereby preventing the moving crossbeam 50 from shifting or vibrating during the crimping process, ensuring the positional stability of the pressure roller 21 when it applies pressure to the safety line area, and improving the consistency of crimping accuracy.

[0038] In some embodiments, the movable crossbeam 50 is provided with a first pin hole 51, and the locking mechanism 40 includes a bracket 83 and a locking cylinder 41. The bracket 83 has a second pin hole 81. The locking cylinder 41 is mounted on the bracket 83, and its end is connected to a pin 42. When the movable crossbeam 50 moves to the target position, the first pin hole 51 aligns with the second pin hole 81, and the locking cylinder 41 drives the pin 42 to insert into the first pin hole 51 and the second pin hole 81, thereby locking the movable crossbeam 50. Here, the alignment of the first pin hole 51 and the second pin hole 81 can also be understood as concentric arrangement. The bracket 83 is mounted on the column 82.

[0039] This embodiment employs a pin-type locking structure. When the first pin hole 51 aligns with the second pin hole 81, the locking cylinder 41 drives the pin 42 to insert, achieving rigid locking of the moving crossbeam 50. This provides a reliable locking method with high repeatability, improving the positioning accuracy and long-term operational stability of the equipment. After the moving crossbeam 50 is locked, the pressure roller 21, pushed by the first cylinder 23, acts on the safety line area of ​​the windowed safety line paper 200 covering the roller 10. The pressure roller 21 rotates at a constant linear speed with the roller 10.

[0040] When paper feeding or equipment maintenance is required, the locking cylinder 41 retracts, causing the pin 42 to be pulled out of the first pin hole 51 of the moving crossbeam 50. Then the second cylinder 30 retracts, causing the moving crossbeam 50 to exit the working position, leaving space for paper feeding or maintenance between the pressure roller 21 and the roller 10.

[0041] In some embodiments, the bracket 83 has two second pin holes 81, which are located above and below the first pin hole 51 and are arranged concentrically.

[0042] In some embodiments, the diameters of the first pin hole 51 and the second pin hole 81 are the same as the diameter of the pin 42.

[0043] In some embodiments, the device 100 further includes a pneumatic control system connected to the first cylinder 23 and the second cylinder 30, for controlling the air intake and operation of the first cylinder 23 and the second cylinder 30.

[0044] This embodiment uses a pneumatic control system to uniformly control the air intake and movement of the first cylinder 23 and the second cylinder 30, thereby enabling coordinated movement of the various actuators and improving the automation level and control reliability of the device 100.

[0045] In some embodiments, the pneumatic control system includes a directional valve and a proportional valve. The directional valve controls the extension and retraction of the pressure roller 21. The proportional valve regulates the air pressure entering the first cylinder 23 to adjust the clamping force of the pressure roller 21 on the safety line area.

[0046] This embodiment sets up a reversing valve and a proportional valve in the pneumatic control system. The reversing valve is used to control the extension and retraction of the pressure roller 21, and the proportional valve is used to adjust the air pressure entering the first cylinder 23. This enables precise adjustment of the pressing force of the pressure roller 21, making the pressing process more controllable. This not only helps to improve the flattening effect, but also avoids damage to the paper 200 due to excessive pressure.

[0047] The working principle of device 100 is as follows: After the paper feeding is completed and a start signal is received, the device 100 waits for the start signal. When the start signal is received, the second cylinder 30 drives the moving beam 50 to move along the first horizontal direction to approach the roller 10. After the moving beam 50 reaches the target position, the locking cylinder 41 drives the pin 42 to insert into the first pin hole 51 of the moving beam 50, thereby locking the moving beam 50. Then, the first cylinder 23 drives the swing arm 22 to swing, causing the pressure roller 21 to press on the safety line area of ​​the paper 200 on the roller 10. When the device 100 receives a no-paper or detachment signal, the first cylinder 23 releases pressure, and the swing arm 22 returns to its original position under the elastic restoring force of the elastic element 24, thereby driving the pressure roller 21 away from the paper 200. Then, the locking cylinder 41 drives the pin 42 to disengage from the moving beam 50, that is, pull out the pin 42. Finally, the second cylinder 30 drives the moving beam 50 to move in the opposite direction to the first horizontal direction, thereby moving away from the roller 10 and returning to the initial position.

[0048] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A device for improving the flatness of paper with a windowed security thread, characterized in that, include: The roller is configured to be rotatable to feed paper in a preset rotation direction; Multiple pressing mechanisms are provided, each of which includes a swing arm, an elastic element, a pressure roller, and a first cylinder. The swing arm is rotatably configured, and the pressure roller and the elastic element are respectively connected to both ends of the swing arm. In the working state, driven by the first cylinder, the swing arm swings, thereby driving the pressure roller to move along a first horizontal direction to apply pressure to the safety line area of ​​the paper, thereby reducing the thickness of the safety line area. At this time, the elastic element is in a compressed state. When not in operation, the first cylinder releases the applied pressure, the elastic element returns to its original state, causing the swing arm to return to its original position, thereby driving the pressure roller away from the paper.

2. The apparatus according to claim 1, characterized in that, The number of the pressing mechanism is two, and the pressure rollers of the two pressing mechanisms apply pressure to the safety line area of ​​the paper in sequence.

3. The apparatus according to claim 2, characterized in that, The width of the pressure roller is the same as the width of the safety line area.

4. The apparatus according to any one of claims 1-3, characterized in that, Also includes: Mounting plate, the first cylinders of the plurality of pressing mechanisms are mounted on the mounting plate, and one end of the elastic member is connected to the mounting plate and the other end is connected to the swing arm; the middle area of ​​the swing arm is rotatably connected to the mounting plate.

5. The apparatus according to claim 3, characterized in that, Also includes: A slide rail is arranged along a second horizontal direction, and the mounting plate is slidably mounted on the slide rail and can move along the slide rail, wherein the second horizontal direction is perpendicular to the first horizontal direction.

6. The apparatus according to claim 5, characterized in that, Also includes: Second cylinder; A movable crossbeam is mounted on the second cylinder, and the slide rail is mounted on the movable crossbeam; Driven by the second cylinder, the moving crossbeam can move along the first horizontal direction, thereby driving the moving crossbeam, the mounting plate, and the plurality of pressing mechanisms to move along the first horizontal direction.

7. The apparatus according to claim 6, characterized in that, Also includes: A locking mechanism, installed on the movable crossbeam, is used to lock the movable crossbeam when the second cylinder drives it to the target position; the pressure roller of the pressing mechanism applies pressure to the safety line area of ​​the paper after the movable crossbeam is locked.

8. The apparatus according to claim 7, characterized in that, The movable crossbeam is provided with a first pin hole, and the locking mechanism includes: The bracket has a second pin hole; A locking cylinder is mounted on the bracket and has a pin connected to its end; When the moving crossbeam moves to the target position, the first pin hole and the second pin hole are aligned, and the locking cylinder drives the pin to insert into the first pin hole and the second pin hole, thereby locking the moving crossbeam.

9. The apparatus according to claim 8, characterized in that, Also includes: A pneumatic control system, connected to the first cylinder and the second cylinder, is used to control the air intake and movement of the first cylinder and the second cylinder.

10. The apparatus according to claim 9, characterized in that, The pneumatic control system includes: A reversing valve is used to control the extension and retraction of the pressure roller; A proportional valve is used to regulate the air pressure entering the first cylinder, so as to regulate the clamping force of the pressure roller on the safety line area.

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