Rewinder with automatic tension control mechanism

Abstract

The utility model relates to the technical field of winding equipment, and disclose a rewinding machine with automatic tension control mechanism, contain work bench, the top of work bench upper end is provided with cross support rod, the lower extreme symmetrical sliding of cross support rod is provided with moving frame, the inside wall between moving frame is rotatably provided with lower tension roller, the upper extreme of moving frame is left and right symmetrical screw thread connection has second adjusting bolt, two second adjusting bolts are rotatably provided with sliding block in the slot of moving frame both ends through, the inside of sliding block is fixedly provided with spring, the lower extreme of two springs is fixedly provided with mounting block, two mounting blocks are rotatably provided with upper tension roller between, the utility model discloses the symmetrical flexible adjustment of tension roller spacing is realized through the cooperation of bidirectional screw rod and motor, and is suitable for different specifications paper, with the aid of the elastic buffer structure of spring and telescopic sleeve rod, the up and down fine adjustment of upper tension roller is combined, and the real-time dynamic stable control of paper tension is realized.

Description

Technical Field

[0001] This utility model relates to the field of winding equipment technology, specifically a rewinding machine with an automatic tension control mechanism. Background Technology

[0002] In the decorative paper processing industry, within the field of rewinding equipment technology, the rewinder, as the core equipment for achieving continuous paper winding and finishing, directly determines the flatness, tightness, and subsequent processing adaptability of the rewound paper through its tension control accuracy. It is a crucial link in ensuring production quality and efficiency. Currently, mainstream rewinders on the market generally adopt a "spring-pulley (or guide wheel)" combination structure for their automatic tension control mechanism. By using the tension of a preset spring, a constant tension is applied to the decorative paper passing between the components to maintain the stability of the paper during the conveying process. However, in actual production conditions, such traditional tension control solutions have significant technical limitations and are difficult to meet the needs of high-precision, multi-specification paper processing: The tension value of the spring needs to be preset based on the average tension requirement of the paper to be processed, and it cannot be flexibly adjusted according to real-time working conditions after being set. When there are fluctuations in the conveying speed of the decorative paper (such as sudden increases or decreases in speed due to motor start-up and shutdown, load changes), local material differences (such as uneven paper thickness, fiber density fluctuations), or minor adjustments to batch specifications, the fixed tension spring cannot respond in time and compensate for the tension changes. This can easily lead to wrinkles and deviations caused by excessively loose paper tension, or stretching and deformation of the paper caused by excessively tight tension, or even breakage, which seriously affects the product yield. Utility Model Content

[0003] The purpose of this invention is to provide a rewinding machine with an automatic tension control mechanism, solving the following technical problem: Rewinding machines generally employ a "spring-pulley (or guide wheel)" combination structure for their automatic tension control mechanism, applying constant tension to the decorative paper passing between components through a preset spring tension. The spring tension value needs to be preset based on the average tension requirement of the paper to be processed, and once set, it cannot be flexibly adjusted according to real-time working conditions.

[0004] The objective of this utility model can be achieved through the following technical solutions: A rewinding machine with an automatic tension control mechanism includes a worktable, a first fixed bracket is fixedly installed at the middle of the upper end of the worktable, a first adjusting bolt is threaded onto the first fixed bracket, and a cross-shaped support rod is rotatably connected to the lower end of the first fixed bracket through the first fixed bracket. The lower end of the cross-shaped support rod is symmetrically and slidably provided with a movable frame, and the inner sidewalls of the movable frame are rotatably provided with a lower tension roller, and the upper end of the movable frame is symmetrically threaded with a second adjusting bolt. Two second adjusting bolts pass through the slots at both ends of the movable frame and are rotatably mounted with sliding blocks. Springs are fixedly mounted inside the sliding blocks. Mounting blocks are fixedly mounted at the lower ends of the two springs. An upper tension roller is rotatably mounted between the two mounting blocks.

[0005] As a further embodiment of this utility model: the upper end of the workbench is fixedly provided with a second fixed bracket located on both sides of the first fixed bracket, and a second slot is provided on one side of each of the multiple second fixed brackets. The two ends of the cross-shaped support rod are fixedly provided with connecting rods, and the connecting rods are slidably engaged in the second slots.

[0006] As a further embodiment of this utility model: the spring is internally fitted with a retractable sleeve rod fixed between the mounting block and the sliding block.

[0007] As a further embodiment of this utility model: a bidirectional lead screw is rotatably provided in the sliding groove at the lower end of the cross-shaped support rod, and sliders are symmetrically threaded on the outer surface of the bidirectional lead screw, and the two sliders are respectively fixedly connected to the two movable frames.

[0008] As a further embodiment of this utility model: storage brackets are symmetrically fixedly arranged on the upper end of the workbench, and U-shaped grooves are opened on the upper end of both storage brackets, and storage rollers are rotatably arranged in the U-shaped grooves.

[0009] As a further embodiment of this utility model: a positioning plate is fixedly provided between the first fixed bracket and the second fixed brackets on both sides, and a movable plate that can slide up and down is provided on the inner side of the plurality of positioning plates. A horizontal through groove is opened on one side of the movable plate, and a roller is rolled inside the through groove. One end of the roller is fixedly connected to the movable frame.

[0010] As a further embodiment of this utility model: a winding frame is symmetrically arranged at the upper end of the workbench, and a winding roller is rotatably arranged between the two symmetrical winding frames.

[0011] As a further embodiment of this invention, the thread directions at both ends of the bidirectional lead screw are opposite.

[0012] The beneficial effects of this utility model are: (1) This utility model uses an elastic buffer structure composed of a spring and a telescopic sleeve rod, combined with the vertical alignment design of the upper and lower tension rollers, to respond in real time to tension fluctuations during paper conveying. When the local thickness of the paper is uneven or the conveying speed changes slightly, the spring can drive the upper tension roller to make flexible fine adjustments through extension and retraction, so as to offset the tension peak or make up for the insufficient tension in time, and avoid problems such as paper wrinkling and breakage; at the same time, the second adjusting bolt can adjust the initial height of the upper tension roller, further adapting to the basic tension requirements of paper of different thicknesses, and greatly improving the dynamics and accuracy of tension control; (2) This utility model utilizes a bidirectional lead screw and slider structure driven by a first motor to drive two symmetrical upper and lower tension rollers to move synchronously "towards each other" or "away from each other" in the horizontal direction, thereby achieving symmetrical adjustment of the tension roller spacing. It can quickly adapt to decorative papers of different widths and materials. Furthermore, the slot constraint design of the cross-shaped support rod and connecting rod, and the rolling guide structure of the moving frame and positioning plate respectively ensure the structural stability and smooth movement during the tension adjustment process. This allows the equipment to meet the needs of conveying multiple paper specifications without major modifications, greatly improving the flexibility and applicability of the rewinder in actual production.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the cross-shaped support rod of this utility model; Figure 3 This is a structural schematic diagram of the movable frame and other components of this utility model; Figure 4 This is a structural schematic diagram of the sliding block and telescopic sleeve of this utility model; Figure 5 This is a structural schematic diagram of the movable plate and rollers and other components of this utility model.

[0016] In the diagram: 1. Workbench; 2. Storage bracket; 3. Storage roller; 4. First fixed bracket; 5. First adjusting bolt; 6. Cross-shaped support rod; 7. First slot; 8. Connecting rod; 9. Second fixed bracket; 10. Second slot; 11. First motor; 12. Bidirectional lead screw; 13. Slider; 14. Moving frame; 15. Lower tension roller; 16. Second adjusting bolt; 17. Sliding block; 18. Spring; 19. Mounting block; 20. Telescopic sleeve rod; 21. Upper tension roller; 22. Positioning plate; 23. Moving plate; 24. Through slot; 25. Roller; 26. Rewinding frame; 27. Rewinding roller. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] In the field of rewinding equipment technology, existing rewinders with automatic tension control mechanisms mostly rely on a set of springs and pulleys (or guide wheels) for tension adjustment. When decorative paper passes through this assembly, the tension applied by the springs is the core means of maintaining paper tension. However, the tension value of such springs is usually preset based on the average tension requirement of the paper, and it is difficult to change after being set. This makes it impossible to make real-time dynamic adjustments according to actual working conditions (such as fluctuations in paper feed speed, local material differences, etc.), which easily leads to tension instability problems.

[0020] Meanwhile, the two sets of horizontally symmetrical tension rollers in the rewinder lack sufficient flexibility in spacing adjustment, making it difficult to adapt to the varying requirements of decorative paper in terms of width, material, and thickness. This limitation significantly reduces the equipment's adaptability when handling decorative paper of different specifications, thus restricting the flexibility and efficiency of the rewinder in actual production applications.

[0021] In summary, traditional tension control devices can no longer meet the needs of high-precision, multi-specification paper feeding. There is an urgent need to optimize the structure and upgrade the functions to achieve dynamic and precise tension adjustment, and ultimately improve the overall operating performance and applicability of the paper feeding system.

[0022] Example 1: Please refer to Figure 1 As shown, a rewinding machine with an automatic tension control mechanism includes a worktable 1. Storage brackets 2 are symmetrically fixed on the upper end of the worktable 1, and each of the two storage brackets 2 has a U-shaped groove at its upper end. A storage roller 3 for carrying the material to be rewound (decorative paper) is rotatably assembled in the U-shaped groove, forming the initial unwinding support structure for the rewinding operation. The storage roller 3 of the decorative paper is placed on the storage bracket 2 to facilitate subsequent rewinding.

[0023] Specifically, please refer to Figure 1 , Figure 5As shown, a first fixed bracket 4 is fixedly installed in the middle of the upper end of the workbench 1. A first adjusting bolt 5 is threaded onto the first fixed bracket 4. The first adjusting bolt 5 passes through the first fixed bracket 4 and is rotatably connected to a cross-shaped support rod 6 at its lower end. A first slot 7 is symmetrically opened on the inner side of the first fixed bracket 4. Two ends of the cross-shaped support rod 6 are slidably engaged in the first slot 7. A connecting rod 8 is fixedly installed at both ends of the cross-shaped support rod 6. A second fixed bracket 9 is fixedly installed on both sides of the upper end of the workbench 1. There are two sets of second fixed brackets 9, which are respectively distributed on both sides of the first fixed bracket 4. Each set of second fixed brackets 9 includes two bracket units, which are symmetrically arranged along the two long sides of the workbench 1. Each of the second fixed brackets 9 has a second slot 10 on one side, and both ends of the two connecting rods 8 are slidably engaged in the second slot 10. In this embodiment, by rotating the first adjusting bolt 5, the first adjusting bolt 5 drives the cross-shaped support rod 6 to move downward. The two ends of the cross-shaped support rod 6 are locked in the first slot 7, and the connecting rod 8 is also locked in the second slot 10. Through the sliding track of the slot, it is constrained to move only up and down along the groove of the slot, so as to avoid the cross-shaped support rod 6 from shifting or shaking in the horizontal direction, thus ensuring the structural stability and ensuring the symmetry of the tension adjustment on both sides.

[0024] Specifically, please refer to Figure 2 As shown, a first motor 11 is fixedly installed in the middle of one side of a connecting rod 8. A sliding groove is opened at the lower end of the cross-shaped support rod 6 along the long side of the workbench 1. A bidirectional lead screw 12 is rotatably installed in the sliding groove. One end of the bidirectional lead screw 12 is connected to the output shaft of the first motor 11. A slider 13 is symmetrically threaded on the outer surface of the bidirectional lead screw 12. The two sliders 13 are slidably engaged in the sliding groove. In this embodiment, the first motor 11 drives the bidirectional lead screw 12 to rotate. The threads at both ends of the bidirectional lead screw 12 are in opposite directions. When the bidirectional lead screw 12 rotates, the two sliders 13 will move symmetrically along the axis of the bidirectional lead screw 12, either "approaching each other" or "moving away from each other," due to the opposite threads. This perfectly meets the requirement of "synchronous and symmetrical adjustment of both sides of the paper" (such as tension roller spacing adjustment, guide position calibration, etc.). The transmission function is highly matched with the application scenario.

[0025] Example 2: Based on Example 1, please refer to... Figure 3 , Figure 4As shown, a movable frame 14 is fixedly installed at the lower end of each of the two symmetrical sliders 13. A lower tension roller 15 is rotatably installed between the inner sidewalls of the movable frame 14. A second adjusting bolt 16 is symmetrically threaded to the upper end of the movable frame 14. The second adjusting bolt 16 passes through the slots at both ends of the movable frame 14 and a sliding block 17 is rotatably installed there. The sliding block 17 is slidably engaged in the slot. A through hole is opened inside the sliding block 17. A spring 18 is fixedly installed in the through hole. An installation block 19 is fixedly installed at the lower end of the spring 18. A telescopic sleeve 20 is provided between the spring 18 and the installation block 19. An upper tension roller 21 is rotatably installed between the two symmetrical installation blocks 19. The upper tension roller 21 and the lower tension roller 15 are on the same vertical line. In this embodiment, the paper passes between the lower tension roller 15 and the upper tension roller 21 above, forming a basic clamping and conveying channel. The second adjusting bolts 16, which are symmetrically threaded at both ends of the moving frame 14, can be rotated to adjust the depth of their insertion into the slot, thereby pushing the sliding block 17, which is slidably engaged in the slot, to move up and down, thereby adjusting the initial height of the upper tension roller 21 to accommodate papers of different thicknesses. At the same time, the spring 18 fixed in the through hole inside the sliding block 17 and the telescopic sleeve 20 (the sleeve acts as a guide to prevent the spring 18 from shifting) form an elastic buffer. In this structure, spring 18 is connected to upper tension roller 21 via mounting block 19 at the lower end. When tension fluctuations occur during paper feeding (such as uneven paper thickness or slight changes in feeding speed), spring 18 can flexibly adjust upper tension roller 21 up and down by its own extension and retraction, offsetting tension peaks or supplementing insufficient tension in real time, thus preventing paper from wrinkling or breaking due to sudden changes in tension. Furthermore, upper tension roller 21 and lower tension roller 15 are always on the same vertical line, ensuring that the paper is subjected to uniform force during clamping and feeding, further guaranteeing the stability and accuracy of tension control.

[0026] Specifically, please refer to Figure 5 As shown, a positioning plate 22 is fixedly installed between the first fixed bracket 4 and the second fixed brackets 9 on both sides. A movable plate 23 that can slide up and down is provided on the inner side of the multiple positioning plates 22. A horizontal through groove 24 is opened on one side of the multiple movable plates 23. The through groove 24 is consistent with the length direction of the worktable 1. A roller 25 is rolled inside the through groove 24. One end of the roller 25 is fixedly connected to the outer wall of the movable frame 14. In this embodiment, through the rolling engagement of the through groove 24 and the roller 25, on the one hand, the roller 25 can roll flexibly along the horizontal direction of the through groove 24 (i.e., the length direction of the workbench 1), which provides precise guidance for the moving frame 14 to be adjusted horizontally with the bidirectional lead screw 12, and also reduces the resistance of the moving frame 14 when moving horizontally by replacing sliding friction with rolling friction, thus avoiding adjustment jamming or component wear due to excessive friction; on the other hand, the moving plate 23 can slide freely in the vertical direction inside the positioning plate 22. When the moving frame 14 is adjusted vertically with the cross-shaped support rod 6 (such as when adapting to different thicknesses of paper), the moving plate 23 will slide up and down synchronously with the vertical displacement of the moving frame 14. At the same time, with the limiting effect of the positioning plate 22 on the moving plate 23, the moving frame 14 is constrained to move only along the vertical trajectory, preventing it from tilting or shaking during the vertical adjustment process.

[0027] Specifically, please refer to Figure 1 As shown, a winding frame 26 is symmetrically arranged on the upper end of the workbench 1, and a winding roller 27 is rotatably arranged between the two symmetrical winding frames 26. A motor is arranged on one side of the winding frame 26, and the output shaft of the motor is connected to the winding frame 26. By driving the take-up roller 27 to rotate by the motor, the decorative paper can be slowly wound onto the take-up roller 27, realizing the automatic take-up of the rewinder.

[0028] Example 3: Based on Examples 1 and 2, please refer to... Figures 1-5 As shown, a rewinder with an automatic tension control mechanism, when in use, places the decorative paper storage roller 3 on the storage bracket 2, inserts it between two symmetrical upper tension rollers 21 and lower tension rollers 15, and rewinds it through the take-up roller 27. By rotating the second adjusting bolt 16, the sliding block 17 is moved downward, which can adjust the initial height of the upper tension roller 21. The elastic buffer structure composed of the spring 18 and the telescopic sleeve 20, together with the vertical alignment design of the upper tension roller 21 and lower tension roller 15, can respond to tension fluctuations in paper feeding in real time. With the help of the bidirectional lead screw 12 and slider 13 structure driven by the first motor 11, the two symmetrical upper tension rollers 21 and lower tension rollers 15 can be driven to move synchronously "towards each other" or "away from each other" in the horizontal direction, realizing symmetrical adjustment of the distance between the two symmetrical tension rollers, and can quickly adapt to decorative papers of different widths and materials.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rewinding machine with an automatic tension control mechanism, comprising a worktable (1), characterized in that, A first fixed bracket (4) is fixedly installed in the middle of the upper end of the workbench (1). A first adjusting bolt (5) is threaded on the first fixed bracket (4). The first adjusting bolt (5) passes through the first fixed bracket (4) and is rotatably connected to a cross-shaped support rod (6) at its lower end. The lower end of the cross-shaped support rod (6) is symmetrically and slidably provided with a movable frame (14), and a lower tension roller (15) is rotatably provided between the inner sidewalls of the movable frame (14). The upper end of the movable frame (14) is symmetrically threaded with a second adjusting bolt (16). Two second adjusting bolts (16) pass through the slots at both ends of the movable frame (14) and are rotatably provided with sliding blocks (17). A spring (18) is fixedly provided inside the sliding block (17). An installation block (19) is fixedly provided at the lower end of each of the two springs (18). An upper tension roller (21) is rotatably provided between the two installation blocks (19).

2. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, The upper end of the workbench (1) is fixedly provided with a second fixed bracket (9) located on both sides of the first fixed bracket (4). A second slot (10) is provided on one side of each of the multiple second fixed brackets (9). A connecting rod (8) is fixedly provided at both ends of the cross-shaped support rod (6), and the connecting rod (8) is slidably engaged in the second slot (10).

3. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, The spring (18) is fitted with a telescopic sleeve (20) that is fixed between the mounting block (19) and the sliding block (17).

4. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, A bidirectional lead screw (12) is rotatably installed in the sliding groove at the lower end of the cross-shaped support rod (6). A slider (13) is symmetrically threaded on the outer surface of the bidirectional lead screw (12). The two sliders (13) are respectively fixedly connected to the two moving frames (14).

5. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, The upper end of the workbench (1) is symmetrically fixed with storage brackets (2), and the upper end of the two storage brackets (2) is provided with U-shaped grooves, and storage rollers (3) are rotatably arranged in the U-shaped grooves.

6. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, A positioning plate (22) is fixedly installed between the first fixed bracket (4) and the second fixed brackets (9) on both sides. A movable plate (23) that can slide up and down is installed on the inner side of the multiple positioning plates (22). A horizontal through groove (24) is opened on one side of the movable plate (23). A roller (25) is rolled inside the through groove (24). One end of the roller (25) is fixedly connected to the movable frame (14).

7. A rewinding machine with an automatic tension control mechanism according to claim 1, characterized in that, The upper end of the workbench (1) is symmetrically provided with winding frames (26), and a winding roller (27) is rotatably provided between the two symmetrical winding frames (26).

8. A rewinding machine with an automatic tension control mechanism according to claim 4, characterized in that, The threads at both ends of the bidirectional lead screw (12) are in opposite directions.

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