Defect punching repair process for banknote intaglio plate

Abstract

The present application relates to banknote intaglio plate making technical field, specifically to a kind of banknote intaglio plate defect punch repair equipment, comprising: bearing, which is provided with plate station;Positioning assembly, installed in the side of bearing, positioning assembly is installed on positioning light emitter, positioning light emitter is towards plate station setting;Plate mechanism, plate mechanism and positioning assembly are respectively installed in the opposite sides of bearing, needle piece is installed on plate mechanism, needle piece and positioning light emitter are opposite setting, plate station is set through between needle piece and positioning light emitter with ejection space.By using positioning light emitter, the installation position of printing version body is accurately positioned, and the needle piece is used to lift the back of printing version body, which can greatly reduce the metal deformation on printing version body due to defect repair, avoid the damage of printing version body caused by the damage of printing version body in subsequent process or use process due to self-repair defect.

Description

Technical Field

[0001] This invention relates to the field of banknote intaglio printing plate making technology, specifically to a device for repairing defects in banknote intaglio printing plates. Background Technology

[0002] In the field of banknote plate making, pitting defects will inevitably appear on the surface of the nickel plate during the electroforming process. The current process is based on the production methods of the last century. The steps to repair pitting defects are divided into manual positioning using a "pull code", hammering the plate, and manual repair. Pitting defects mainly include plate base plating, plate surface contamination, dents, scratches, etc. The most difficult type of defect to repair is plate base plating.

[0003] Diffusion plating of the plate base refers to the deposition of solid particulate impurities from the plating solution into the plating layer during the electroforming process. While the plate surface appears normal, the poor density of the nickel surrounding the impurities causes defects to be exposed in subsequent processes such as chromium plating, significantly increasing the scrap rate. When repairing diffusion plating defects in banknote intaglio printing plates, a ring-shaped, gentle depression typically forms around the raised defect on the front side, while a large, gentle depression centered on the impact point forms on the back side (back impact point diameter: depression diameter = 1:20). This results in simultaneous depressions on both sides of the nickel plate, inevitably causing plate breakage during printing and leading to even more serious quality issues. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the repair of defects in banknote intaglio printing plates will cause the printing plate to become concave and break during printing, thereby providing a banknote intaglio printing plate defect repair device.

[0005] To solve the above-mentioned technical problems, the present invention provides a device for repairing defects in banknote intaglio printing plates, comprising: The carrier component has a printing plate station on it; A positioning component is installed on one side of the carrier, and a positioning light emitter is mounted on the positioning component, which is set towards the printing plate station; The top plate mechanism and the positioning component are respectively installed on opposite sides of the carrier. The top plate mechanism is equipped with an ejector pin, which is positioned opposite to the positioning light emitter. An ejection space is provided through the ejector pin and the positioning light emitter at the printing plate station. The ejector pin has a first state in which it moves toward the positioning light emitter to penetrate and extend out of the ejection space, and a second state in which it moves away from the positioning light emitter to be completely retracted into the ejection space.

[0006] Optionally, it also includes a fixing mechanism installed on the side of the carrier with the positioning component. The fixing mechanism is provided with a fixing lifting component, which has a working state of moving toward the printing plate station to abut against the printing plate body, and a standby state of moving away from the printing plate station to separate from the printing plate body.

[0007] Optionally, a stop plate is installed at the end of the fixed lifting assembly facing the printing plate station, and a positioning hole is provided on the stop plate, with the positioning light emitter positioned directly opposite the positioning hole.

[0008] Optionally, the abutment plate and the fixed lifting assembly are connected by a mounting bracket, and the positioning assembly is installed between the abutment plate and the fixed lifting assembly, and the positioning assembly is installed on the mounting bracket.

[0009] Optionally, the top plate mechanism includes: a drive assembly, a top plate cylinder, and a worm gear lifting assembly. The output end of the drive assembly is connected to the drive end of the worm gear lifting assembly. The top plate cylinder is installed on the lifting end of the worm gear lifting assembly, and the top plate cylinder and the lifting end of the worm gear lifting assembly are coaxially arranged. The ejector pin is installed on the end of the top plate cylinder away from the worm gear lifting assembly.

[0010] Optionally, it also includes an auxiliary positioning component, which is located on the side of the carrier where the positioning component is located. The auxiliary positioning component is equipped with a laser emitter, which is positioned towards the printing plate station. The emitted light from the laser emitter intersects with the emitted light from the positioning light emitter.

[0011] Optionally, a microscope is mounted on the positioning component, with the microscope facing the printing plate station, and a display is also mounted on the carrier, with the display electrically connected to the microscope.

[0012] Optionally, the positioning light emitter is built into the microscope.

[0013] Optionally, it also includes an electromagnetic adsorption device installed at the printing plate station.

[0014] Optionally, it also includes a control component, a positioning component, and a top plate mechanism, all of which are electrically connected to the control component.

[0015] The technical solution of this invention has the following advantages: 1. The banknote intaglio printing plate defect repair device provided by the present invention includes: a carrier component on which a printing plate station is provided; a positioning component installed on one side of the carrier component, a positioning light emitting component installed on the positioning component, the positioning light emitting component being positioned towards the printing plate station; a top plate mechanism, the top plate mechanism and the positioning component being respectively installed on opposite sides of the carrier component, a top pin component installed on the top plate mechanism, the top pin component and the positioning light emitting component being positioned opposite each other, an ejection space being provided through the printing plate station between the top pin component and the positioning light emitting component, the top pin component having a first state of moving towards the positioning light emitting component to penetrate and extend out of the ejection space, and a second state of moving away from the positioning light emitting component to completely retract into the ejection space.

[0016] When repairing defects on banknote intaglio printing plates, the first step is to reshape the defective area into a regular inverted cone shape. Then, the printing plate is placed on the printing plate station with the recessed side facing the positioning component. The positioning light emitter is activated, emitting a cross-shaped positioning light beam. The printing plate is moved to precisely locate the recessed defect area at the center cross point. The printing plate is then fixed in the printing plate station, and the top plate mechanism is activated. The ejector pin moves towards the positioning light emitter, extending the ejection space to precisely eject the corresponding defect location on the back of the printing plate, causing the internal impurities in the recessed defect on the front of the printing plate to fully turn outward and fill the recess. After the ejection repair, the printing plate is removed, and tools are used to smooth the raised recessed defect to complete the final repair. By using a positioning light emitter to precisely position the printing plate, and using a pin to lift the back of the printing plate, the metal deformation caused by defect repair can be greatly reduced, the degree of damage to the printing plate during defect repair is reduced, the mechanical properties of the printing plate are improved, and damage to the printing plate caused by its own defect repair during subsequent processes or use is avoided.

[0017] 2. The banknote intaglio printing plate defect repair equipment provided by this invention has a stop plate installed at one end of the fixed lifting component facing the printing plate station. The stop plate has a positioning hole, and a positioning light emitter is positioned directly opposite the positioning hole. By setting the stop plate with the positioning hole and ensuring that the positioning light emitted by the positioning light emitter passes through the positioning hole, the accuracy of the irradiation direction of the positioning light emitter can be guaranteed. When the positioning light emitter deflects, causing the positioning light to deviate from the ejector pin, the positioning light will deviate outside the positioning hole, making it easy to detect and allowing for timely correction of the positioning light emitter, thus improving the accuracy of the equipment during long-term operation.

[0018] 3. The banknote intaglio printing plate defect repair device provided by the present invention includes a top plate mechanism comprising: a drive assembly, a top plate cylinder, and a worm gear lifting assembly. The output end of the drive assembly is connected to the drive end of the worm gear lifting assembly. The top plate cylinder is installed on the lifting end of the worm gear lifting assembly, and the top plate cylinder and the lifting end of the worm gear lifting assembly are coaxially arranged. The ejector pin is installed on the end of the top plate cylinder opposite to the worm gear lifting assembly. When the ejector pin performs the ejection operation, the screw at the lifting end of the worm gear lifting assembly moves up and down, driving the ejector pin to achieve minute movement. The top plate cylinder impacts the back of the printing plate, making the impact speed easy to control and allowing for accurate control of the ejector pin's impact force and effect. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the banknote intaglio printing plate defect repair device provided in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the fixing mechanism provided in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the top plate mechanism provided in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram illustrating the steps of the banknote intaglio printing plate defect repair process provided in the embodiments of the present invention.

[0024] Figure 5 This is a process flow diagram of the banknote intaglio printing plate defect repair process provided in the embodiments of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1. Support platform; 2. Worm gear reducer lift; 3. Abutment plate; 4. Positioning hole; 5. Mounting bracket; 6. Microscope; 7. Display screen; 8. Ejector pin; 9. Ejector hole; 10. Servo motor; 11. Top plate cylinder; 12. Worm gear lift assembly; 13. Floating joint; 14. Laser emitter; 15. Electromagnetic adsorption device; 16. Electrical control cabinet; 17. Touch screen controller; 18. Pressure block; 19. High-definition digital industrial camera; 20. Printing plate station; 21. Positioning assembly; 22. Positioning light emitter; 23. Top plate mechanism. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example like Figures 1 to 3 The image shows a banknote intaglio printing plate defect repair device provided in this embodiment, including: a support platform 1 as a support member, a top plate mechanism 23, a fixing mechanism, and a positioning component 21 installed on the fixing mechanism.

[0031] A printing plate station 20 is provided on the bearing surface at the top of the support platform 1. A positioning component 21 is installed on the upper side of the bearing surface, and a positioning light emitter 22 is installed on the positioning component 21, facing the printing plate station 20. A fixing mechanism is installed on the side of the support component where the positioning component 21 is located. The fixing mechanism is provided with a worm gear reducer 2 as a fixing lifting component. The worm gear reducer 2 has a working state in which it moves towards the printing plate station 20 to abut against the printing plate body, and a standby state in which it moves away from the printing plate station 20 to separate from the printing plate body. An abutment plate 3 is installed on the end of the worm gear reducer 2 facing the printing plate station 20. The abutment plate 3 is provided with a positioning hole 4, and the positioning light emitter 22 is positioned directly opposite the positioning hole 4. The abutment plate 3 is connected to the fixing lifting component through a mounting bracket 5. The positioning component 21 is installed between the abutment plate 3 and the fixing lifting component, and the positioning component 21 is mounted on the mounting bracket 5. A microscope 6 is mounted on the positioning assembly 21, facing the printing plate station 20. A display screen 7, serving as a display element, is also mounted on the carrier and is electrically connected to the microscope 6. A positioning light emitter 22 is built into the microscope 6. A high-definition digital industrial camera 19 is mounted on the top of the microscope 6 to capture images observed in the microscope 6 and display them on the display screen 7.

[0032] The top plate mechanism 23 and the positioning component 21 are respectively installed on opposite sides of the support member. The top plate mechanism 23 is installed on the lower side of the support surface, and an ejector pin 8 is installed on the top plate mechanism 23, with the ejector pin 8 facing upward. The ejector pin 8 and the positioning light emitter 22 are arranged opposite each other. An ejection hole 9, serving as an ejection space, is provided through the printing plate station 20 between the ejector pin 8 and the positioning light emitter 22. The ejector pin 8 has a first state in which it moves toward the positioning light emitter 22 to penetrate and extend out of the ejection space, and a second state in which it moves away from the positioning light emitter 22 to be completely retracted into the ejection space. The top plate mechanism 23 includes: a servo motor 10, a top plate cylinder 11, and a worm gear lifting assembly 12 as drive components. The output end of the drive assembly is connected to the drive end of the worm gear lifting assembly 12. The top plate cylinder 11 is installed on the lifting end of the worm gear lifting assembly 12, and the top plate cylinder 11 and the lifting end of the worm gear lifting assembly 12 are coaxially arranged. The ejector pin 8 is installed on the end of the top plate cylinder 11 that is away from the worm gear lifting assembly 12. To facilitate the replacement of the ejector pin 8, a floating joint 13 is provided between the ejector pin 8 and the top plate cylinder 11.

[0033] On one side of the carrier plate equipped with the positioning component 21, an auxiliary positioning component is also installed at the bottom of the carrier plate. This auxiliary positioning component includes a laser emitter 14, which is mounted on the bottom of the carrier plate via a ball joint. The laser emitter 14 faces the printing plate station 20, and the emitted light from the laser emitter 14 intersects with the emitted light from the positioning light emitter 22. When the printing plate is installed at the station, a red or green laser is emitted by the laser emitter 14, causing the laser to intersect with the crosshair emitted by the positioning light emitter 22 in the plane containing the upper surface of the printing plate. Moving the printing plate aligns the defect location on the printing plate with the intersection of the laser and the crosshair.

[0034] An electromagnetic adsorption device 15 is also provided on the printing plate station 20, which is used to pre-fix the printing plate body after it is positioned at the printing plate station 20, so as to prevent the printing plate body from shifting or misaligning when the worm gear reducer 2 moves downward to press and fix the printing plate body.

[0035] Below the support platform 1, an electrical control cabinet 16 is installed as a control component. The worm gear lifting assembly 12, the top plate cylinder 11, the worm gear reducer 2 in the positioning assembly 21, the microscope 6, the display screen 7, and the laser emitter 14 in the top plate mechanism 23 are all electrically connected to the electrical control cabinet 16. Above the support platform 1, a touch screen controller 17, electrically connected to the electrical control cabinet 16, is also installed for manual control of the repair equipment.

[0036] The process for repairing dents in banknote nickel plates includes the following steps, such as: Figure 4 and Figure 5 As shown: Step 1: Ejector calibration. Select the appropriate ejector according to the type of pit defect and install it on the floating joint 13. Through calibration, make the ejector and the center cross of the positioning system in the same position, thereby achieving the purpose of accurate positioning. Step 2: Defect pre-repair. Technicians use scrapers to remove internal impurities as much as possible and repair the defect into a regular inverted conical pit, so that the internal impurities can be fully turned outward after step 3 (top plate). Step 3: Perform impact repair. Adjust the impact stroke and impact force parameters of the ejector pin 8 according to the size of the defect. The impact stroke of the ejector pin 8 is the distance from the tip of the ejector pin 8 to the table surface. Its size is adjusted by the servo motor 10 driving the worm gear lifting assembly 12. The screw at the lifting end of the worm gear lifting assembly 12 moves up and down, causing the ejector pin to move accordingly. The impact force is controlled by the air pressure adjusted by the pressure regulator. After the parameters are adjusted, place the printing plate with the front defect on the equipment table. Move the printing plate to position the pit defect area at the center cross of the display system for precise positioning. Activate the equipment's electromagnetic adsorption device 15 to fix the printing plate. Place the movable pressure block 18 on the surface of the printing plate with the pit defect. Activate the upper pressure mechanism to ensure that the pressure block 18 is in close contact with the front surface of the printing plate. During plate repair, activate the equipment's electromagnetic adsorption device 15, and at the same time, the top plate cylinder 11 drives the ejector pin to precisely impact the back of the plate, thereby achieving the purpose of making the pit defect protrude.

[0037] Step 4: Leveling and Repair. Technicians use tools such as scrapers and wrenches to manually repair the raised pitted areas to make them smooth.

[0038] Step 5: Observe whether there are still impurities. If there are still impurities, repeat steps 1 to 4 above until the front and back of the pit defect area are completely flat, thereby achieving the purpose of repairing the nickel plate pit.

[0039] Through process experiments, multiple sets of optimal top plate process parameters were obtained for typical pit defects. This allows for targeted application of different top plate parameters to repair pit defects of varying degrees, precisely achieving the optimal punching effect. This ensures that only minimal metal deformation occurs in the pattern area and back side of the defect repair point, significantly improving the quality of the nickel gravure printing plate. The defect punching repair equipment achieves precise punching, resulting in a significantly smaller metal deformation area in the repaired pattern area compared to traditional plate repair methods, reducing damage to the pattern area and improving appearance quality. The corresponding minimal metal deformation on the back side enhances the overall mechanical properties of the nickel gravure printing plate, effectively increasing its metal strength during in-process grinding and final printing, thus significantly improving the quality of the nickel gravure printing plate product.

[0040] Furthermore, the quality requirements for finished plates typically limit the number of hammer marks on the back. Manual hammering often causes significant deformation near the hammer marks on the back of the nickel gravure plate, leading to simultaneous denting on both sides of the hammer marks during subsequent grinding processes due to internal stress. Plates requiring hammering repair must be ground before hammering, thus plates with more than three hammer marks are unusable. However, utilizing the aforementioned defect-punching repair equipment, which minimizes metal deformation on the plate surface, defects can be repaired before grinding, resulting in no deformation on either side of the plate after grinding. Tests on pre-grinding top-plate repair of nickel gravure plates demonstrate that the finished plates exhibit excellent quality, contributing to a reduction in the scrap rate of nickel gravure plates. The repair equipment provided in this embodiment reduces the learning difficulty and workload for operators by modifying and optimizing the top plate repair process, and eliminates the significant safety hazards that existed in the original operation. Traditional hammering processes require multiple hammering operations to repair defects. Each hammering process necessitates thorough cleaning of the plate surface and hammering table, gently placing the heavy nickel plate on the hammering table, hammering it, and then flipping it over to the repair table. To prevent scratching the plate surface, each step requires meticulous care. Furthermore, the plate material is large in area and weight, with sharp edges, resulting in immense workload for operators while performing precise repairs, and presenting significant safety hazards during the operation.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A process for repairing defects in banknote intaglio printing plates, characterized in that, The banknote intaglio printing plate defect correction process is applied to banknote intaglio printing plate defect correction equipment, which includes: A carrier component, on which a printing plate station (20) is provided; A positioning component (21) is installed on one side of the carrier, and a positioning light emitter (22) is installed on the positioning component (21), and the positioning light emitter (22) is arranged facing the printing plate station (20); The top plate mechanism (23) and the positioning component (21) are respectively installed on opposite sides of the carrier. The top plate mechanism (23) is equipped with a pin (8). The pin (8) and the positioning light emitter (22) are arranged opposite each other. The printing plate station (20) has an ejection space through the pin (8) and the positioning light emitter (22). The pin (8) has a first state of moving toward the positioning light emitter (22) to penetrate and extend out of the ejection space, and a second state of moving away from the positioning light emitter (22) to completely retract into the ejection space. The process for repairing defects in the intaglio printing plate for banknotes includes the following steps: Step 1: Calibrate the ejector pin (8). Select the appropriate ejector pin (8) according to the type of pit defect. Through calibration, make the cross-shaped positioning light emitted by the ejector pin (8) and the positioning light emitter (22) at the same position. Step 2: Defect pre-repair. Use a scraper to remove as much internal impurity as possible and repair the defect into a regular inverted conical pit. Step 3: Perform top impact repair. Adjust the impact stroke and impact force of the ejector pin (8) according to the size of the defect, so that the ejector pin (8) can accurately impact the position of the corresponding defect on the back of the printing plate body, so that the internal impurities in the pit defect on the front of the printing plate body will turn outward and fill the pit. Step 4: Leveling and repair. Use tools such as scrapers and trowels to manually repair the raised pitted areas to a smooth surface. Step 5: Observe whether there are still impurities. If there are still impurities, repeat steps 1 to 4 above until the front and back of the pit defect area are completely flat.

2. The banknote intaglio printing plate defect repair process according to claim 1, characterized in that, The banknote intaglio printing plate defect punching repair equipment also includes a fixing mechanism, which is installed on the side of the bearing member where the positioning component (21) is located. The fixing mechanism is provided with a fixing lifting component. The fixing lifting component has a working state in which it moves toward the printing plate station (20) to abut against the printing plate body, and a standby state in which it moves away from the printing plate station (20) to separate from the printing plate body.

3. The banknote intaglio printing plate defect repair process according to claim 2, characterized in that, The fixed lifting assembly is equipped with an abutment plate (3) at one end facing the printing plate station (20). The abutment plate (3) is provided with a positioning hole (4), and the positioning light emitter (22) is positioned directly opposite the positioning hole (4).

4. The banknote intaglio printing plate defect repair process according to claim 3, characterized in that, The abutment plate (3) is connected to the fixed lifting assembly via a mounting bracket (5). The positioning component (21) is installed between the abutment plate (3) and the fixed lifting assembly, and the positioning component (21) is installed on the mounting bracket (5).

5. The banknote intaglio printing plate defect repair process according to any one of claims 1 to 4, characterized in that, The top plate mechanism (23) includes: a drive assembly, a top plate cylinder (11), and a worm gear lifting assembly (12). The output end of the drive assembly is connected to the drive end of the worm gear lifting assembly (12). The top plate cylinder (11) is installed on the lifting end of the worm gear lifting assembly (12), and the top plate cylinder (11) and the lifting end of the worm gear lifting assembly (12) are coaxially arranged. The ejector pin (8) is installed on the end of the top plate cylinder (11) away from the worm gear lifting assembly (12).

6. The banknote intaglio printing plate defect repair process according to any one of claims 1 to 4, characterized in that, The banknote intaglio printing plate defect punching repair equipment also includes an auxiliary positioning component, which is located on the side of the carrier where the positioning component (21) is located. The auxiliary positioning component is provided with a laser emitter (14), which is positioned towards the printing plate station (20). The emitted light from the laser emitter (14) intersects with the emitted light from the positioning light emitter (22).

7. The banknote intaglio printing plate defect repair process according to any one of claims 1 to 4, characterized in that, A microscope (6) is mounted on the positioning component (21), the microscope (6) is positioned facing the printing plate station (20), and a display is also mounted on the carrier, the display being electrically connected to the microscope (6).

8. The banknote intaglio printing plate defect repair process according to claim 7, characterized in that, The positioning light emitter (22) is built into the microscope (6).

9. The banknote intaglio printing plate defect repair process according to any one of claims 1 to 4, characterized in that, The banknote intaglio printing plate defect repair equipment also includes an electromagnetic adsorption device (15), which is installed on the printing plate station (20).

10. The banknote intaglio printing plate defect repair process according to any one of claims 1 to 4, characterized in that, The banknote intaglio printing plate defect repair equipment also includes a control component, and the positioning component (21) and the top plate mechanism (23) are both electrically connected to the control component.

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