Printing paper embossing equipment

Abstract

The invention relates to the technical field of embossing, and discloses printing paper embossing equipment which comprises deviation correcting mechanisms symmetrically arranged on the two sides of a printing roller of an embossing machine, each deviation correcting mechanism comprises a paper feeding frame and a paper discharging frame which are arranged on the paper feeding side and the paper discharging side of the printing roller correspondingly, and film cylinders with the same width as printing paper are embedded in the paper feeding frames and the paper discharging frames; the film cylinder extends to the gap direction of the printing roller and forms a sliding guide surface; the electric push rod pieces are arranged at the two corner positions, away from the gap end of the printing roller, of the film barrel, closed-loop control is formed through the paper output detection assembly, and the electric push rod pieces change the tension force of the corresponding side of the paper by adjusting the vertical height of the film barrel; through a visual detection module and an image comparison algorithm of the paper delivery detection assembly, the mark offset can be accurately recognized in real time, closed-loop control is formed, the electric push rod piece completes dynamic correction within a short time by adjusting the height of the thin film cylinder, the response speed and precision of correction are remarkably improved, and mark offset is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of embossing, and more specifically, to an embossing apparatus for printed paper. Background Technology

[0002] In the printing industry, embossing is widely used to enhance the texture and visual appeal of printed materials. Traditional paper embossing equipment typically uses printing rollers to emboss the paper. However, in actual production, due to the physical properties of the paper itself and various factors during equipment operation, the paper is prone to deviation during the embossing process, causing the embossed pattern to deviate from the preset position, resulting in pattern offset, which seriously affects product quality and production efficiency.

[0003] Traditional mechanical web guiding devices have slow response times and struggle to achieve high-precision dynamic web guiding, especially on high-speed production lines where even minute deviations can accumulate into significant defects. To address this, we propose a paper embossing device. Summary of the Invention

[0004] This invention provides a printing paper embossing device that solves the technical problem that it is difficult to achieve high-precision dynamic correction in related technologies, especially on high-speed production lines, where even small deviations can accumulate into significant defects.

[0005] This invention provides a printing paper embossing device, comprising: a deviation correction mechanism symmetrically arranged on both sides of the printing roller of the embossing machine, the deviation correction mechanism comprising: The paper feed frame and the paper output frame are respectively located on the paper feed side and the paper output side of the printing roller. Both of them are fitted with a film tube of the same width as the printing paper. The film tube extends to the direction of the printing roller gap and forms a sliding guide surface. The electric push rod is located at the two corners of the film tube away from the gap of the printing roller. It forms a closed-loop control through the paper output detection component. The electric push rod changes the tension of the paper on the corresponding side by adjusting the vertical height of the film tube. The anti-stick component includes two closed-loop rolled films, which wrap around the surfaces of the upper and lower printing rollers and rotate with the rollers. The surface of the rolled film has a microstructure texture to reduce the adhesion of the printing paper. The paper output detection component includes a vision detection module. The vision detection module identifies the offset of the paper mark through an image comparison algorithm, monitors the paper tension distribution and the offset of the paper mark in real time, and triggers the corresponding electric push rod when the offset of the paper mark is detected. By adjusting the height of the film tube, the tension difference between the two sides of the paper is changed, so that the offset is dynamically corrected within 10ms.

[0006] Furthermore, the two closed-loop pressing films of the anti-stick component are the first pressing film and the second pressing film, respectively. First rotating columns are provided on both sides near the upper printing roller. The two first rotating columns are located inside the first pressing film. The first pressing film rotates along the two first rotating columns, and the upper printing roller passes through the closed-loop first pressing film.

[0007] Furthermore, two second rotating film columns are provided on the inner side of the second pressing film, and the two second rotating film columns are located on both sides of the lower printing roller. The second pressing film rotates along the two second rotating film columns, and the lower printing roller passes through the closed-loop second pressing film, while the paper to be printed passes through the gap between the first pressing film and the second pressing film, without directly contacting the upper and lower printing rollers.

[0008] Furthermore, an instrument box is fixedly installed below the paper feed frame, and two electric push rods are fixed inside the instrument box. Inside the instrument box, there are also two tension sensors and an air supply pump.

[0009] Furthermore, the electric push rod includes a telescopic column that passes through the bottom plate of the paper feed frame, and a film pusher plate is vibratingly installed at the top of the telescopic column, with the film pusher plate and the rotating shaft of the telescopic column located on the side closer to the printing roller.

[0010] Furthermore, side flexible strips are fixedly provided on both sides of the film tube. The film tube is duckbill shaped, and the top of the side flexible strip away from the printing roller is fixedly connected to the pusher plate. A film fixing arm is fixedly provided on the upper wall of the side flexible strip near the printing roller, and the film fixing arm is fixedly connected to the housing of the printing area of ​​the embossing machine to fix the film tube near the printing roller.

[0011] Furthermore, the air supply pump is connected to two air blowing pipes at its outlet, and the outlets of the two air blowing pipes are connected to an air blowing hose. The outlets of the two air blowing hoses are connected to the upper wall of the film cylinder. Gas is blown into the film cylinder, forming an air film in the film cylinder and on the surface of the printing paper to be printed.

[0012] Furthermore, two limiting grooves are provided on the side of the paper feed frame away from the printing roller. A turntable is rotatably arranged in the two limiting grooves. A tension swing arm is fixedly arranged on the outer side of the turntable. A paper measuring head is fixedly arranged at the end of the tension swing arm away from the turntable. The paper measuring head and the tension swing arm are in an L-shape. The paper measuring head lifts the paper to be printed from below. The paper measuring heads on both sides of the paper to be printed detect the tightness of the paper from both sides.

[0013] Furthermore, a pull line is fixedly installed on the other side of the turntable, and a counterweight ball is fixedly installed in the middle section of the pull line. The end of the pull line away from the turntable is connected to a tension sensor. The counterweight ball continuously drives the paper measuring head to lift the paper to be printed, which is used to detect the tightness data of the two sides of the paper to be printed, and the data is processed by the system.

[0014] Furthermore, a mounting plate is fixedly installed on the side of the paper output frame away from the printing roller, and the paper output detection component is fixedly installed on the mounting plate. The detection direction of the paper output detection component is towards the paper, and the internal design of the paper output frame is the same as that of the paper feed frame.

[0015] The beneficial effects of this invention are as follows: This invention uses the visual detection module and image comparison algorithm of the paper output detection component to identify the offset of the scratch in real time and form a closed-loop control. The electric push rod adjusts the height of the film tube to complete dynamic correction in a short time, which significantly improves the response speed and accuracy of the correction and effectively avoids the offset of the scratch. The film tube forms a sliding guide surface, and the height of the film tube is adjusted by an electric push rod to change the paper tension, thus realizing non-contact guidance and tension adjustment of the paper and avoiding damage to the paper caused by traditional mechanical alignment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the position and structure of the paper feed frame and paper output frame of the present invention; Figure 3 This is a schematic diagram of the paper output detection component of the present invention; Figure 4 This is a schematic diagram of the left view structure of the paper feed frame of the present invention; Figure 5 This is a schematic diagram of the tension swing arm structure of the present invention; Figure 6 This is a schematic diagram of the pusher plate structure of the present invention; Figure 7 This is a schematic diagram of the anti-stick component structure of the present invention; Figure 8 This is a schematic diagram of the thin film tube structure of the present invention.

[0017] In the diagram: 11. Embossing machine; 2. Deviation correction mechanism; 21. Paper feed frame; 22. Paper output frame; 23. Limiting groove; 24. Tension swing arm; 241. Paper measuring head; 242. Turntable; 243. Pulling line; 244. Counterweight ball; 25. Film tube; 26. Side soft strip; 27. Instrument box; 28. Air blowing hose; 29. ​​Air supply pump; 201. Air blowing duct; 202. Electric push rod; 203. Telescopic column; 204. Film pushing plate; 205. Tension sensor; 206. Film fixing arm; 31. Mounting plate; 32. Paper output detection component; 4. Anti-stick component; 41. First pressing film; 42. First film transfer column; 43. Second film transfer column; 44. Second pressing film. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figure 1 - Figure 8 As shown, a printing paper embossing device includes: a deviation correction mechanism 2 symmetrically arranged on both sides of the printing roller of the embossing machine 11, the deviation correction mechanism 2 comprising: The paper feed frame 21 and the paper output frame 22 are respectively set on the paper feed side and the paper output side of the printing roller. Both of them are fitted with a film tube 25 of the same width as the printing paper. The film tube 25 extends to the direction of the printing roller gap and forms a sliding guide surface. The electric push rod 202 is located at the two corners of the film tube 25 away from the gap of the printing roller. It forms a closed-loop control through the paper output detection component 32. The electric push rod 202 changes the tension of the paper on the corresponding side by adjusting the vertical height of the film tube 25. The anti-stick component 4 includes two closed-loop rolled films, which wrap around the surfaces of the upper and lower printing rollers and rotate with the rollers. The surface of the rolled film has a microstructure texture to reduce the adhesion of the printing paper. The paper output detection component 32 includes a vision detection module. The vision detection module identifies the offset of the paper mark through an image comparison algorithm, monitors the paper tension distribution and the offset of the paper mark in real time, and triggers the corresponding side electric push rod 202 when the offset of the paper mark is detected. By adjusting the height of the film tube 25, the tension difference between the two sides of the paper is changed, so that the offset is dynamically corrected within 10ms.

[0020] The two closed-loop pressing films of the anti-stick component 4 are the first pressing film 41 and the second pressing film 44. The two sides near the upper printing roller are provided with the first film transfer column 42. The two first film transfer columns 42 are located inside the first pressing film 41. The first pressing film 41 rotates along the two first film transfer columns 42, and the upper printing roller passes through the closed-loop first pressing film 41.

[0021] Two second rotating film columns 43 are provided on the inner side of the second pressing film 44, and the two second rotating film columns 43 are located on both sides of the lower printing roller. The second pressing film 44 rotates along the two second rotating film columns 43, and the lower printing roller passes through the closed loop of the second pressing film 44, while the paper to be printed passes through the gap between the first pressing film 41 and the second pressing film 44, without directly contacting the upper and lower printing rollers.

[0022] An instrument box 27 is fixedly installed below the paper feed frame 21. Two electric push rods 202 are fixed inside the instrument box 27. Two tension sensors 205 and an air supply pump 29 are also installed inside the instrument box 27.

[0023] The electric push rod 202 includes a telescopic column 203 that passes through the bottom plate of the paper feed frame 21. A film pusher 204 is vibratingly installed at the top of the telescopic column 203, and the rotation axis of the film pusher 204 and the telescopic column 203 is located on the side closer to the printing roller.

[0024] Side flexible strips 26 are fixedly provided on both sides of the film tube 25. The film tube 25 is duckbill shaped, and the top of the side flexible strips 26 away from the printing roller is fixedly connected to the pusher plate 204. A film fixing arm 206 is fixedly provided on the upper wall of the side flexible strip 26 near the printing roller, and the film fixing arm 206 is fixedly connected to the housing of the printing area of ​​the embossing machine 11 to fix the film tube 25 near the printing roller.

[0025] The air supply pump 29 has two air blowing pipes 201 connected to its outlet end. The outlet ends of the two air blowing pipes 201 are tightly connected to an air blowing hose 28. The outlet ends of the two air blowing hoses 28 are connected to the upper wall of the film cylinder 25. Gas is blown into the film cylinder 25, forming an air film in the film cylinder 25 and on the surface of the printing paper to be printed.

[0026] Two limiting grooves 23 are provided on the side of the paper feed frame 21 away from the printing roller. A turntable 242 is rotatably arranged in the two limiting grooves 23. A tension swing arm 24 is fixedly arranged on the outer side of the turntable 242. A paper measuring head 241 is fixedly arranged at the end of the tension swing arm 24 away from the turntable 242. The paper measuring head 241 and the tension swing arm 24 are L-shaped. The paper measuring head 241 lifts the paper to be printed from below. The paper measuring heads 241 on both sides of the paper to be printed detect the tightness of the paper from both sides.

[0027] A pull line 243 is fixedly and vertically mounted on the other side of the turntable 242, and a counterweight ball 244 is fixedly mounted in the middle section of the pull line 243. The end of the pull line 243 away from the turntable 242 is connected to the tension sensor 205. The counterweight ball 244 drives the paper measuring head 241 to lift the paper to be printed, which is used to detect the tightness data of both sides of the paper to be printed, and to provide data processing for the system.

[0028] A mounting plate 31 is fixedly installed on the side of the paper output frame 22 away from the printing roller, and the paper output detection component 32 is fixedly installed on the mounting plate 31. The detection direction of the paper output detection component 32 is towards the paper. The internal design of the paper output frame 22 is the same as that of the paper feed frame 21.

[0029] Paper guiding and tension pre-conditioning stage: The printing paper first enters the paper feed frame 21. Inside the frame, a film tube 25 is supplied with air by an air pump 29. A stable airflow (approximately 0.2~0.5 kPa) is injected into the inner cavity of the film tube through an air blowing hose 28, forming a uniform air film on the lower surface of the paper. The thickness of the air film can be estimated using the following formula: ; Where ℎ represents the air film thickness (μm), μ represents the aerodynamic viscosity, Q represents the gas flow rate, L represents the width of the film tube 25, b represents the length of the film tube 25, and ΔP represents the air pressure difference. This air film effectively reduces the sliding friction coefficient between the paper and the film tube 25 (down to 0.05~0.1), allowing the paper to enter the printing roller area with minimal resistance.

[0030] Meanwhile, the tension swing arm 24, under the action of the counterweight ball 244, constantly lifts the edge of the paper, and the tension on both sides of the paper is detected in real time by the tension sensor 205. and tension difference It is transmitted to the control system as a pre-correction reference.

[0031] The tension swing arms 24 located on both sides of the paper feed frame 21, under the constant action of the counterweight balls 244, always lift the two edges of the paper. The paper measuring head 241 at the end of the tension swing arm 24 converts the physical state of the paper edge into a signal, which is connected to the tension sensor 205 through the turntable 242 and the pull line 243, thereby sensing the tension on both sides of the paper in real time, i.e., the initial tension distribution. This data is transmitted to the control system in real time as a preliminary basis for predicting the paper deviation trend and making fine adjustments to the tension.

[0032] Embossing and anti-adhesion stages: When the paper enters the embossing roller area, it does not directly contact the roller surface, but passes between the first pressing film 41 and the second pressing film 44. The microstructure texture (roughness Ra≈1.6~3.2μm) of the pressing film surface can transmit printing pressure, and because the contact area is reduced by about 40%~60%, it significantly reduces the adhesion between the paper and the roller surface. The pressing film rotates synchronously with the roller, and its movement speed... With the linear speed of the printing roller satisfy: ; in The elastic sliding coefficient (approximately 0.001~0.005) ensures that there is no relative slippage between the liner and the paper, thus avoiding pattern distortion.

[0033] Dynamic deviation correction closed-loop control stage: Once an offset is detected, the system's closed-loop control logic immediately takes effect. The paper output detection component 32 sends the offset information to the control center, which performs calculations and makes decisions within a very short time, issuing a command to the electric actuator 202 on the side where the offset occurred. The electric actuator 202 then actuates, driving its telescopic column 203 to precisely raise or lower, thereby pulling the side strip 26 at the corresponding end of the film tube 25 via the film pusher plate 204, changing the local height of the film tube 25. The change in the height of the film tube 25 directly changes the path and tension of the paper on that side. The end of the film tube 25 closest to the printing roller is fixed by the film fixing arm 206, ensuring that the adjustment action is precisely applied to the correction section.

[0034] The embossed paper is exported through the paper output frame 22. The vision detection module of the paper output detection component 32 acquires paper images at a frequency of more than 2000 frames per second, and calculates the lateral offset δ (unit: mm) of the embossing mark in real time through an image comparison algorithm. When |δ| > δ tolerance (usually set to 0.1 mm), the system triggers closed-loop correction within 10 ms. The relationship between the offset δ and the tension difference ΔF is adjusted by a PID controller: ; Where u(t) is the control output, , , These are the tuning parameters.

[0035] The electric actuator 202 receives a control signal and drives the telescopic column 203 to rise and fall (stroke accuracy ±0.02mm), changing the height H of one end of the film cylinder 25 via the film pusher plate 204. The approximate relationship between the height change ΔH and the tension difference ΔF between the two sides of the paper is as follows: ; Where k is the equivalent stiffness coefficient of the film tube 25, and θ is the paper entry angle. An increase in tension on one side can cause the paper to move laterally to the other side. The empirical formulas for the offset correction Δx and ΔF are: ; Where C is the material coefficient, L is the length of the correction section, E is the elastic modulus of the paper, d is the paper thickness, and v is the paper feed speed.

[0036] Through the above closed-loop adjustment, the system can stabilize the scratch offset δ within the tolerance range within 10ms, achieving real-time and accurate correction at high speed.

[0037] When one side of the film tube 25 is lifted, the path of the paper on that side becomes longer, and the tension increases instantaneously; while the other side remains unchanged or is adjusted in the opposite direction. Under the effect of the instantaneous tension difference between the two sides, the paper will automatically move laterally towards the side with less tension, thereby "pulling back" the misaligned pattern to the correct position. The entire process of "detection-judgment-execution-correction" forms a high-speed feedback closed loop, ensuring that any slight deviation can be dynamically offset in a very short time, keeping the paper on a precise path for embossing.

[0038] By combining visual inspection with a closed-loop control system of electric linear actuators, real-time monitoring and millisecond-level correction of embossing offset are achieved, reducing the error range of traditional manual correction (above ±0.5mm) to within ±0.1mm, significantly improving the alignment accuracy of embossing patterns and increasing the product qualification rate by approximately 15% to 25%. The double closed-loop pressing film separates the paper from the printing roller, and the micro-textured surface reduces the contact area, reduces paper residue and adhesion, and extends the cleaning cycle by 3 to 5 times; at the same time, it avoids paper stretching and deformation, and is especially suitable for embossing of easy-to-stick materials; By using the tension swing arm 24 and tension sensor 205 to detect tension on both sides in real time, combined with the height adjustment of the film tube 25, the adaptive balance of tension on both sides of the paper is achieved, preventing serpentine deviation, and is especially suitable for the stable conveying of wide (2m) paper. The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. A printing paper embossing device, characterized in that, include: A deviation correction mechanism (2) is symmetrically arranged on both sides of the printing roller of the embossing machine (11), the deviation correction mechanism (2) comprising: The paper feed frame (21) and the paper output frame (22) are respectively set on the paper feed side and the paper output side of the printing roller. Both of them are fitted with a film tube (25) of the same width as the printing paper. The film tube (25) extends to the direction of the printing roller gap and forms a sliding guide surface. The electric push rod (202) is located at the two corners of the film tube (25) away from the gap of the printing roller. It forms a closed-loop control through the paper output detection component (32). The electric push rod (202) changes the tension of the paper on the corresponding side by adjusting the vertical height of the film tube (25). The anti-sticking component (4) includes two closed-loop rolled films, which respectively wrap around the surfaces of the upper and lower printing rollers and rotate with the rollers. The surface of the rolled film has a microstructure texture to reduce the adhesion of the printing paper. The paper output detection component (32) includes a vision detection module. The vision detection module identifies the offset of the scratch through an image comparison algorithm, monitors the paper tension distribution and the offset of the scratch in real time, and triggers the corresponding side electric push rod (202) when the scratch offset is detected. By adjusting the height of the film tube (25), the tension difference between the two sides of the paper is changed, so that the offset is dynamically corrected within 10ms.

2. The printing paper embossing equipment according to claim 1, characterized in that, The two closed-loop rolling films of the anti-stick component (4) are a first rolling film (41) and a second rolling film (44). A first film transfer column (42) is provided on both sides near the upper printing roller. The two first film transfer columns (42) are located inside the first rolling film (41). The first rolling film (41) rotates along the two first film transfer columns (42), and the upper printing roller passes through the closed-loop first rolling film (41).

3. The printing paper embossing equipment according to claim 2, characterized in that, Two second rolling columns (43) are provided on the inner side of the second rolling film (44), and the two second rolling columns (43) are located on both sides of the lower printing roller. The second rolling film (44) rotates along the two second rolling columns (43), and the lower printing roller passes through the closed-loop second rolling film (44), while the paper to be printed passes through the gap between the first rolling film (41) and the second rolling film (44) without directly contacting the upper and lower printing rollers.

4. The printing paper embossing equipment according to claim 1, characterized in that, The instrument box (27) is fixedly installed below the paper feed frame (21). The two electric push rods (202) are fixed inside the instrument box (27). The instrument box (27) is also equipped with two tension sensors (205) and an air supply pump (29).

5. The printing paper embossing equipment according to claim 4, characterized in that, The electric push rod (202) includes a telescopic column (203) that passes through the bottom plate of the paper feed frame (21). The top of the telescopic column (203) is provided with a film pusher plate (204), and the rotation axis of the film pusher plate (204) and the telescopic column (203) is located on the side close to the printing roller.

6. The printing paper embossing equipment according to claim 5, characterized in that, Side strips (26) are fixedly provided on both sides of the film tube (25). The film tube (25) is duckbill shaped, and the top of the side strips (26) away from the printing roller is fixedly connected to the push plate (204). A film fixing arm (206) is fixedly provided on the upper wall of the side strip (26) near the printing roller. The film fixing arm (206) is fixedly connected to the casing of the printing area of ​​the embossing machine (11) to fix the film tube (25) near the printing roller.

7. The printing paper embossing equipment according to claim 4, characterized in that, The air supply pump (29) has two air blowing pipes (201) connected to its air outlet. The air outlets of the two air blowing pipes (201) are tightly connected to an air blowing hose (28). The air outlets of the two air blowing hoses (28) are connected to the upper wall of the film cylinder (25). Gas is blown into the film cylinder (25) and forms an air film in the film cylinder (25) and on the surface of the printing paper to be printed.

8. The printing paper embossing equipment according to claim 4, characterized in that, Two limiting grooves (23) are provided on the side of the paper feed frame (21) away from the printing roller. A turntable (242) is rotatably arranged in the two limiting grooves (23). A tension swing arm (24) is fixedly arranged on the outer side of the turntable (242). A paper measuring head (241) is fixedly arranged at the end of the tension swing arm (24) away from the turntable (242). The paper measuring head (241) and the tension swing arm (24) are in an L-shape. The paper measuring head (241) lifts the paper to be printed from below. The paper measuring heads (241) on both sides of the paper to be printed detect the tightness of the paper from both sides.

9. The printing paper embossing equipment according to claim 8, characterized in that, A pull line (243) is fixedly suspended on the other side of the turntable (242), and a counterweight ball (244) is fixedly installed in the middle section of the pull line (243). The end of the pull line (243) away from the turntable (242) is connected to the tension sensor (205). The counterweight ball (244) drives the paper measuring head (241) to lift the paper to be printed, which is used to detect the tightness data of both sides of the paper to be printed, and to provide data processing for the system.

10. The printing paper embossing equipment according to claim 1, characterized in that, The paper output frame (22) is fixedly provided with a mounting plate (31) on the side away from the printing roller, and the paper output detection component (32) is fixedly installed with the mounting plate (31). The detection direction of the paper output detection component (32) is towards the paper. The various internal designs of the paper output frame (22) are the same as those of the paper feed frame (21).

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