A method for making a gravure printing plate cylinder and a device therefor

Abstract

The application discloses a method for manufacturing a gravure printing plate cylinder and a manufacturing device thereof, and relates to the technical field of printing plate manufacturing. Due to the offset of the rotating center position of the printing plate cylinder and the axis center of the printing plate cylinder or the change of the knurling fitting pressure, the knurling of the printing plate cylinder is offset from the engraving plate, the engraving precision is affected, the sleeve ring is clamped in the shaft groove position of the side groove block through cooperation of the sleeve ring and the pressure shaft plate, the threaded connection of the threaded cylinder and the threaded rod is utilized, the threaded cylinder is rotated by using a wrench, the pressure shaft plate is pressed down by the threaded cylinder, the fixed shaft drives the printing plate cylinder, the smooth connection of the fixed shaft and the first motor is ensured, the axis of the printing plate cylinder is located at the rotating center position, the close fitting of the printing plate cylinder and the knurling mechanism is ensured, the engraving direction of the engraving plate is adapted to the printing plate cylinder, the low knurling contact pressure is avoided, the knurling effect is affected, the laser engraving direction is offset, and the plate manufacturing precision is affected.

Description

Technical Field

[0001] This invention relates to the field of printing plate making technology, specifically to a method and apparatus for making gravure printing plate cylinders. Background Technology

[0002] A common method for gravure printing plate making is the shape memory material method. The process involves first rolling a knurling wheel or roller onto a printing cylinder coated with shape memory material, creating evenly distributed cells on the material. Then, according to the computer's color separation image signal, the cells are heated at specific points using a laser heating device or a thermal printing device. The heated cells, due to the shape memory effect, restore their original flat shape, while the remaining unheated cells form a color separation pattern on the printing cylinder, completing the plate making process. This method is simple and quick, utilizing the characteristics of shape memory materials to eliminate the need for complex engraving or etching processes, significantly shortening the plate making cycle. The cell distribution, shape, depth, and plate making accuracy can be adjusted as needed by changing the knurling wheel or roller, offering high flexibility.

[0003] During the plate-making process, if the rotation center of the printing plate cylinder deviates from the axis center of the printing plate cylinder, or if the knurling bonding pressure changes, the knurling on the printing plate cylinder and the printing plate will deviate during the engraving and knurling process, affecting the accuracy of the engraving. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A gravure printing plate cylinder making apparatus, comprising:

[0006] The frame has side plates fixedly installed on both sides of the top of the frame, and a support plate is fixedly installed on the outer side of the side plate. A first motor is fixedly installed on the top of the support plate.

[0007] A knurling mechanism is used to roll and form uniform indentations on the surface of a printing cylinder, and the knurling mechanism is installed between the side plates.

[0008] The engraving mechanism is used to laser heat the recesses formed on the surface of the printing cylinder according to the printing plate program, and the engraving mechanism is installed on the outside of the side plate.

[0009] Each side plate has a groove on its top, and a side groove block is fixedly installed in each groove. Each side groove block has a shaft groove on its top, and a threaded rod is fixedly installed on the inner wall of each side groove block. The threaded rods are symmetrically installed along the center of the side groove block's axis. A pressure plate is slidably installed in the shaft groove of each side groove block. Rod holes are opened on both sides of the top of the pressure plate, and the rod holes of the pressure plate are slidably adapted to the outer side of the threaded rod. A collar is rotatably installed on the inner wall of the pressure plate. When the collar engages with the pressure plate and is locked in the shaft groove position of the side groove block, the threaded connection between the threaded cylinder and the threaded rod allows the threaded cylinder to be rotated with a wrench, causing it to press down on the pressure plate. The fixed shaft drives the printing plate cylinder, ensuring smooth connection between the fixed shaft and the first motor. Simultaneously, it keeps the axis of the printing plate cylinder at the center of rotation, ensuring a tight fit between the printing plate cylinder and the knurling mechanism. This also ensures the engraving direction matches the printing plate cylinder, preventing low knurling contact pressure that could affect the knurling effect and cause laser engraving direction deviation, thus affecting plate-making accuracy. A first bearing is rotatably mounted on the inner wall of the collar, and a fixed shaft is rotatably mounted on the inner wall of the first bearing. One end of the fixed shaft is fixedly connected to the output end of the first motor via a coupling. A threaded cylinder is threadedly connected to the outer side of the threaded rod, and the bottom of the threaded cylinder is tightly fitted to the top of the pressure plate.

[0010] Preferably, the engraving mechanism includes side support plates, which are fixedly installed on the outer side of a side plate. A second motor is fixedly installed on the outer side of the side support plates. A lead screw is rotatably installed between the side support plates. One end of the lead screw is fixedly connected to the output end of the second motor, and a threaded hole block is threaded onto the outer side of the lead screw. A transverse convex plate is fixedly installed between the side support plates. A convex strip is provided on the top of the transverse convex plate, and a sliding block is fixedly installed on the bottom of the threaded hole block. The sliding mechanism allows the convex strip of the transverse convex plate to slide against the sliding groove of the sliding block. The adapter restricts the movement direction of the wire hole block when the lead screw rotates. In conjunction with the lead screw's guide, it positions and limits the relationship between the wire hole block and the printing plate cylinder. This prevents the wire hole block from vibrating during movement due to wear between the lead screw and the wire hole block, which could cause changes in the distance between the laser head and the printing plate cylinder. This would result in uneven heating of the laser head when heating the concave points to achieve engraving, affecting the engraving accuracy. The bottom of the sliding block has a sliding groove, and the sliding groove of the sliding block is slidably adapted to the convex strip of the transverse convex plate.

[0011] Preferably, a support block is fixedly installed on the outer side of the wire hole block, and a laser head is fixedly installed on the inner wall of the support block. A sliding hole plate is fixedly installed on the outer side of the wire hole block adjacent to the support block. Circular holes are symmetrically opened on the top of the outer side of the sliding hole plate. A sliding rod is slidably installed at each of the circular holes of the sliding hole plate. A connecting plate is fixedly connected to one end of the sliding rod near the fixed shaft, and a disc is provided at the other end of the sliding rod. A spring is fixedly installed between the disc and the sliding hole plate. Through the cooperation of the spring and the sponge plate, when the printing plate cylinder is installed, the sponge plate is pushed, causing the spring to deform and stretch, generating elastic force to ensure the contact pressure between the sponge plate and the printing plate cylinder. During the movement, in conjunction with the knurling mechanism, the printing plate cylinder after knurling is cleaned again to avoid impurities affecting the laser engraving process. A sponge plate is fixedly installed on the outer side of the connecting plate.

[0012] Preferably, the knurling mechanism includes a sliding shaft, with second bearings rotatably mounted at both ends of the outer side of the sliding shaft. The two ends of the sliding shaft are rotatably connected to the inner wall of the side plate via the second bearings. An inner sleeve is slidably mounted on the outer side of the sliding shaft. The inner sleeve cooperates with the knurling cylinder and assists the outer ring, so that when the engraving mechanism is working, the knurling cylinder moves together with the base plate via the connecting crank, preventing the knurling cylinder from contacting the engraving area again after laser engraving, thus avoiding damage to the engraving plate. Simultaneously, the sliding fit between the inner sleeve and the sliding shaft ensures movement while limiting the distance between the knurling cylinder and the printing plate cylinder, preventing distance changes from affecting the knurling effect. Inner gaskets are rotatably mounted at both ends of the outer side of the inner sleeve. An elastic ring is engaged with the outer side of the inner gasket, and an outer gasket is engaged with the outer side of the elastic ring. The knurling cylinder is fixedly mounted on the outer side of the outer gasket, and protrusions are evenly distributed on the outer side of the knurling cylinder.

[0013] Preferably, both ends of the knurling cylinder have annular grooves, and both ends of the knurling cylinder are fixedly mounted with end plates. The end plates cooperate with the elastic rings, and the elastic deformation of the elastic rings ensures the contact pressure between the knurling cylinder and the printing plate cylinder. At the same time, the end plates limit the deformation range of the elastic rings to avoid excessive deformation during the knurling process, which could cause the knurling cylinder to vibrate and affect the knurling accuracy. The outer side of the end plates has uniform through grooves, and an outer ring is rotatably mounted at each annular groove of the knurling cylinder. A base plate is fixedly mounted at the bottom of the outer ring, and a connecting crank is fixedly mounted on the outer side of the base plate. The end of the connecting crank away from the base plate is fixedly connected to the engraving mechanism.

[0014] A method for making a gravure printing plate cylinder consists of the following steps:

[0015] S1. Plate cylinder cleaning: The surface of the printing cylinder to be used for plate making is cleaned by cleaning equipment to remove impurities and oil stains attached to the cylinder surface, so as to keep the surface of the printing cylinder clean and avoid oil stains affecting plate making.

[0016] S2. Roller installation: The printing plate roller to be made is manually installed into the plate-making device. While fixing the roller, the device can drive the printing plate roller to rotate.

[0017] S3. Knurling: The printing cylinder is rotated by the plate-making device. While rotating, the printing cylinder is in close contact with the knurling parts. Through rotation and contact pressure, the memory material on the surface of the printing cylinder forms grid-like indentations.

[0018] S4. Laser engraving: After roller knurling, according to the graphic design program, a laser is used to heat the corresponding grid indentations, so that the memory metal at the indentation position returns to flatness after being heated, and the unheated indentations form an intaglio printing pattern.

[0019] This invention provides a gravure printing plate cylinder making device. It has the following beneficial effects:

[0020] I. This gravure printing plate cylinder making device, through the cooperation of a collar and a pressure plate, ensures that when the collar is engaged in the shaft groove position of the side groove block, the threaded connection between the threaded cylinder and the threaded rod is utilized. By rotating the threaded cylinder with a wrench, the threaded cylinder presses down on the pressure plate, causing the fixed shaft to drive the printing plate cylinder. This ensures smooth connection between the fixed shaft and the first motor, while simultaneously keeping the axis of the printing plate cylinder at the center of rotation. This ensures a tight fit between the printing plate cylinder and the knurling mechanism, and also adapts the engraving direction to the printing plate cylinder. This prevents the knurling contact pressure from being too low, which would affect the knurling effect, and also avoids laser engraving direction deviation, which would affect the plate making accuracy.

[0021] II. This gravure printing plate cylinder making device restricts the movement direction of the wire hole block when the lead screw rotates by sliding the convex strip of the transverse convex plate and the sliding groove of the sliding block. With the guidance of the lead screw, the position between the wire hole block and the printing plate cylinder is positioned and restricted. This avoids the wire hole block from shaking during movement due to wear of the lead screw and the wire hole block, which would cause changes in the distance between the laser head and the printing plate cylinder. This would result in uneven heating of the laser head when heating the concave points to achieve engraving, thus affecting the engraving accuracy.

[0022] Third, this gravure printing plate cylinder making device uses a spring and a sponge plate in cooperation. When installing the printing plate cylinder, the sponge plate is pushed, causing the spring to deform and stretch, generating elastic force to ensure the bonding pressure between the sponge plate and the printing plate cylinder. During the movement, in conjunction with the knurling mechanism, the printing plate cylinder after knurling is cleaned again to prevent impurities from affecting the laser engraving process.

[0023] IV. This gravure printing plate cylinder making device, through the cooperation of the inner sleeve and the knurling cylinder, and the auxiliary outer ring, enables the knurling cylinder to move together with the base plate through the connecting crank rod during the operation of the engraving mechanism. This avoids the knurling cylinder from contacting the engraving area again after laser engraving, which would damage the engraving plate. At the same time, the sliding fit between the inner sleeve and the sliding shaft ensures movement while limiting the distance between the knurling cylinder and the printing plate cylinder, preventing changes in distance from affecting the knurling effect.

[0024] 5. The gravure printing plate cylinder making device uses an end plate and an elastic ring to ensure the contact pressure between the knurling cylinder and the printing plate cylinder by utilizing the elastic deformation of the elastic ring. At the same time, the end plate limits the deformation range of the elastic ring to avoid excessive deformation during the knurling process, which could cause the knurling cylinder to vibrate and affect the knurling accuracy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a gravure printing plate cylinder making device according to the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of a gravure printing plate cylinder making device according to the present invention.

[0027] Figure 3 This is a partial structural side view of a gravure printing plate cylinder making device according to the present invention;

[0028] Figure 4 This is a partial top view of a gravure printing plate cylinder making device according to the present invention.

[0029] Figure 5 This is a left view of a partial structure of a gravure printing plate cylinder making device according to the present invention.

[0030] Figure 6 This is a schematic diagram of the engraving mechanism of the present invention;

[0031] Figure 7 This is a partial structural schematic diagram of the engraving mechanism of the present invention;

[0032] Figure 8 This is a schematic diagram of the knurling mechanism of the present invention;

[0033] Figure 9 This is a partial structural schematic diagram of the knurling mechanism of the present invention;

[0034] Figure 10 This is a schematic diagram of the plate-making method of the present invention.

[0035] In the diagram: 1. Frame; 2. Engraving mechanism; 3. Knurling mechanism; 4. First motor; 5. Side plate; 6. Support plate; 7. Fixed shaft; 8. Side groove block; 9. Threaded cylinder; 10. Pressure plate; 11. First bearing; 12. Collar; 13. Threaded rod; 201. Second motor; 202. Side support plate; 203. Horizontal convex plate; 204. Lead screw; 205. Threaded hole block; 206. Sliding block; 207. 208. Support block; 209. Laser head; 2000. Sponge board; 210. Spring; 211. Sliding rod; 212. Sliding hole plate; 213. Connecting plate; 301. Sliding shaft; 302. Connecting crank; 303. Second bearing; 304. End plate; 305. Knurled cylinder; 306. Outer washer ring; 307. Elastic ring; 308. Inner sleeve; 309. Inner washer ring; 310. Outer ring; 311. Base plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0037] First embodiment, such as Figures 1 to 5 As shown, the present invention provides a technical solution:

[0038] A gravure printing plate cylinder making apparatus, comprising:

[0039] The frame 1 has side plates 5 fixedly installed on both sides of the top of the frame 1, and a support plate 6 fixedly installed on the outer side of the side plate 5. The first motor 4 is fixedly installed on the top of the support plate 6.

[0040] The knurling mechanism 3 is used to roll and form uniform indentations on the surface of the printing cylinder, and the knurling mechanism 3 is installed between the side plates 5.

[0041] The engraving mechanism 2 is used to laser heat the recesses formed on the surface of the printing cylinder according to the printing plate program, and the engraving mechanism 2 is installed on the outside of the side plate 5.

[0042] The top of each side plate 5 is provided with a groove, and a side groove block 8 is fixedly installed in each groove of the side plate 5. The top of each side groove block 8 is provided with a shaft groove, and a threaded rod 13 is fixedly installed on the inner wall of the side groove block 8. The threaded rod 13 is symmetrically installed along the center position of the axis of the side groove block 8. A pressure plate 10 is slidably installed in the shaft groove of the side groove block 8. After the fixed shaft 7 is fixed to the printing plate cylinder, the first bearing 11 is sleeved on both ends of the outer side of the fixed shaft 7, and a collar 12 is sleeved on the outer side of the first bearing 11. Then, the first bearing 11 is snapped into the shaft groove of the side groove block 8 through the collar 12, so that the two ends of the outer side of the fixed shaft 7 are rotatably connected to the shaft groove of the side groove block 8 through the first bearing 11 and the collar 12. Then, the pressure plate 10 is sleeved into the threaded rod 13 through the rod hole, and the bottom of the pressure plate 10 is tightly fitted with the top of the outer side of the collar 12. Rod holes are provided on both sides of the top of the pressure plate 10. The rod holes of the pressure plate 10 are connected to the threaded rod 13 through the rod hole. The outer side of rod 13 is slidably fitted, and a collar 12 is rotatably installed on the inner wall of pressure plate 10. A first bearing 11 is rotatably installed on the inner wall of collar 12, and a fixed shaft 7 is rotatably installed on the inner wall of first bearing 11. One end of fixed shaft 7 is fixedly connected to the output end of first motor 4 through a coupling. Then, threaded cylinder 9 is installed. The inner wall of threaded cylinder 9 is threadedly connected to the outer side of threaded rod 13. The worker rotates threaded cylinder 9 with a wrench. During the rotation of threaded cylinder 9, the bottom end of threaded cylinder 9 presses against pressure plate 10, and pressure plate 10 presses against collar 12. Fixed shaft 7 drives printing cylinder to gradually increase the contact pressure with knurling mechanism 3. At the same time, fixed shaft 7 is aligned with the axial position of the output end of first motor 4. Finally, the output end of first motor 4 is fixedly connected to fixed shaft 7 through coupling. Threaded cylinder 9 is threadedly connected to the outer side of threaded rod 13. The bottom of threaded cylinder 9 is tightly fitted with the top of pressure plate 10.

[0043] The second embodiment is based on the first embodiment; please refer to [link / reference]. Figures 6 to 7As shown, the engraving mechanism 2 includes a side support plate 202, which is fixedly installed on the outside of the side plate 5. A second motor 201 is fixedly installed on the outside of the side support plate 202. During the process of the first motor 4 driving the printing cylinder to rotate through the fixed shaft 7, the second motor 201 drives the lead screw 204 to rotate. Utilizing the threaded connection between the lead screw 204 and the wire hole block 205, and the sliding fit between the sliding groove block 206 and the transverse convex plate 203, the wire hole block 205 moves along the surface of the lead screw 204. During the movement, the knurling mechanism 3 moves together through the sliding groove block 206. The support block 207 and the sliding plate 212 drive the laser head 208 and the sponge plate 209 to move. A lead screw 204 is rotatably installed between the side support plates 202. One end of the lead screw 204 is fixedly connected to the output end of the second motor 201, and a threaded hole block 205 is threadedly connected to the outer side of the lead screw 204. A transverse convex plate 203 is fixedly installed between the side support plates 202. A convex strip is provided on the top of the transverse convex plate 203. A sliding groove block 206 is fixedly installed on the bottom of the threaded hole block 205. A sliding groove is opened on the bottom of the sliding groove block 206, and the sliding groove of the sliding groove block 206 is slidably adapted to the convex strip of the transverse convex plate 203.

[0044] A support block 207 is fixedly installed on the outer side of the wire hole block 205. A laser head 208 is fixedly installed on the inner wall of the support block 207. A sliding hole plate 212 is fixedly installed on the outer side of the wire hole block 205 adjacent to the support block 207. Circular holes are symmetrically opened on the top of the outer side of the sliding hole plate 212. Sliding rods 211 are slidably installed at each of the circular holes of the sliding hole plate 212. During the rotation of the printing plate cylinder, a concave grid is first formed on the memory metal layer on the cylinder surface by the knurling mechanism 3. In conjunction with the sponge plate 209, when the printing plate cylinder is inserted, the sponge plate 209 contacts the surface of the printing plate cylinder. The connecting plate 213 drives the sliding rods 211, causing the sliding rods 211 to slide on the inner wall of the sliding hole plate 212. The disc drives the spring 210 to stretch and generate elastic force, increasing the contact pressure between the sponge plate 209 and the printing cylinder. After the printing cylinder is knurled, the sponge plate 209 cleans the surface again by rotating. After cleaning, the laser head 208 heats the corresponding grid indentations, restoring the flatness of the memory material at the indentation position. The unheated indentations remain concave, ultimately forming a gravure printing pattern. A connecting plate 213 is fixedly connected to one end of the slide rod 211 near the fixed shaft 7, and a disc is provided at the other end of the slide rod 211. A spring 210 is fixedly installed between the disc and the sliding plate 212. The sponge plate 209 is fixedly installed on the outside of the connecting plate 213.

[0045] The third embodiment is based on embodiments one and two; please refer to [link / reference]. Figures 8 to 10As shown, the knurling mechanism 3 includes a sliding shaft 301. Second bearings 303 are rotatably mounted at both ends of the outer side of the sliding shaft 301. The two ends of the sliding shaft 301 are rotatably connected to the inner wall of the side plate 5 via the second bearings 303. An inner sleeve 308 is slidably mounted on the outer side of the sliding shaft 301. A connecting crank 302 fixes the base plate 311 to the engraving mechanism 2, allowing the engraving mechanism 2 to move during operation. The base plate 311 and outer ring 310 can then drive the knurling cylinder 305 to move together. When the printing plate cylinder is inserted, the knurling cylinder 305 contacts the printing plate cylinder. Inner gaskets 309 are rotatably mounted at both ends of the outer side of the inner sleeve 308. An elastic ring 307 is engaged with the outer side of the inner gasket 309, and an outer gasket 306 is engaged with the outer side of the elastic ring 307. The knurling cylinder 305 is fixedly mounted on the outer side of the outer gasket 306, and protrusions are evenly distributed on the outer side of the knurling cylinder 305.

[0046] Both ends of the knurling cylinder 305 have annular grooves, and both ends of the knurling cylinder 305 are fixedly mounted with end plates 304. The outer side of the end plates 304 has uniform through grooves, and the annular grooves of the knurling cylinder 305 are rotatably mounted with outer rings 310. When the threaded cylinder 9 is rotated, the knurling cylinder 305 is compressed. Utilizing the elastic deformation characteristics of the elastic ring 307, it deforms during compression, which, in conjunction with the printing plate cylinder, increases the contact pressure between the knurling cylinder 305 and the printing plate cylinder. At the same time, the end plates 304 on both sides restrict the position of the elastic ring 307, so that the inner sleeve 308 slides outside the sliding shaft 301, preventing the elastic ring 307 from dislodging. The bottom of the outer ring 310 is fixedly mounted with a base plate 311, and the outer side of the base plate 311 is fixedly mounted with a connecting crank 302. The end of the connecting crank 302 away from the base plate 311 is fixedly connected to the engraving mechanism 2.

[0047] A method for making a gravure printing plate cylinder consists of the following steps:

[0048] S1. Plate cylinder cleaning: The surface of the printing cylinder to be used for plate making is cleaned by cleaning equipment to remove impurities and oil stains attached to the cylinder surface, so as to keep the surface of the printing cylinder clean and avoid oil stains affecting plate making.

[0049] S2. Roller installation: The printing plate roller to be made is manually installed into the plate-making device. While fixing the roller, the device can drive the printing plate roller to rotate.

[0050] S3. Knurling: The printing cylinder is rotated by the plate-making device. While rotating, the printing cylinder is in close contact with the knurling parts. Through rotation and contact pressure, the memory material on the surface of the printing cylinder forms grid-like indentations.

[0051] S4. Laser engraving: After roller knurling, according to the graphic design program, a laser is used to heat the corresponding grid indentations, so that the memory metal at the indentation position returns to flatness after being heated, and the unheated indentations form an intaglio printing pattern.

[0052] In use, the cleaned printing plate cylinder is fixed to the fixed shaft 7, and then the printing plate cylinder is loaded into the plate-making device through the fixed shaft 7. At the same time, during loading, the printing plate cylinder is made to fit tightly with the knurling mechanism 3, and one end of the fixed shaft 7 is fixedly connected to the output end of the first motor 4 through a coupling, so that the first motor 4 cooperates with the engraving mechanism 2. The first motor 4 drives the printing plate cylinder to rotate through the fixed shaft 7, rolling tightly against the knurling mechanism 3 to form a concave grid on the surface of the printing plate cylinder. At the same time, the engraving mechanism 2 drives the knurling mechanism 3 to move along the surface of the printing plate cylinder while performing engraving processing on the surface of the printing plate cylinder.

[0053] After the fixed shaft 7 is fixed to the printing plate cylinder, the first bearing 11 is fitted into both ends of the outer side of the fixed shaft 7, and the collar 12 is fitted into the outer side of the first bearing 11. Then, the first bearing 11 is inserted into the shaft groove of the side groove block 8 through the collar 12, so that the two ends of the outer side of the fixed shaft 7 are rotatably connected to the shaft groove of the side groove block 8 through the first bearing 11 and the collar 12. Then, the pressure plate 10 is fitted into the threaded rod 13 through the rod hole, and the bottom of the pressure plate 10 is tightly fitted with the top of the outer side of the collar 12. Then, the threaded cylinder 9 is installed, and the inner wall of the threaded cylinder 9 is threadedly connected to the outer side of the threaded rod 13. The worker rotates the threaded cylinder 9 with a wrench, so that the bottom end of the threaded cylinder 9 presses the pressure plate 10 during the rotation, and the pressure plate 10 presses the collar 12. This causes the fixed shaft 7 to drive the printing plate cylinder to gradually increase the contact pressure with the knurling mechanism 3, and at the same time, the fixed shaft 7 is aligned with the output shaft of the first motor 4. Finally, the output end of the first motor 4 is fixedly connected to the fixed shaft 7 through a coupling.

[0054] During the rotation of the printing plate cylinder by the first motor 4 via the fixed shaft 7, the second motor 201 drives the lead screw 204 to rotate. Utilizing the threaded connection between the lead screw 204 and the wire hole block 205, and the sliding fit between the sliding groove block 206 and the transverse convex plate 203, the wire hole block 205 moves along the surface of the lead screw 204. During this movement, the knurling mechanism 3 moves along with the sliding groove block 206. Simultaneously, the laser head 208 and the sponge plate 209 move via the support block 207 and the sliding hole plate 212. As the printing plate cylinder rotates, the knurling mechanism 3 first forms a grid of recessed dots on the shape memory metal layer on the cylinder surface, and then... When the sponge board 209 is inserted into the printing cylinder, it makes contact with the surface of the printing cylinder. The connecting plate 213 drives the slide rod 211, which slides on the inner wall of the sliding plate 212. The disc drives the spring 210 to stretch and deform, generating elastic force, which increases the contact pressure between the sponge board 209 and the printing cylinder. After the printing cylinder is knurled, the sponge board 209 cleans the surface again by rotating. After cleaning, the laser head 208 heats the corresponding grid dimples with a laser, which restores the flatness of the memory material at the dimple position. The unheated dimples remain concave, and finally the gravure printing pattern is formed.

[0055] In the knurling mechanism 3, the base plate 311 is fixedly connected to the engraving mechanism 2 via the connecting crank 302. During the movement of the engraving mechanism 2, the base plate 311 and the outer ring 310 can drive the knurling cylinder 305 to move together. When the printing plate cylinder is inserted, the knurling cylinder 305 contacts the printing plate cylinder. When the threaded cylinder 9 is rotated, the knurling cylinder 305 is compressed. Utilizing the elastic deformation characteristics of the elastic ring 307, it deforms during compression, which, in conjunction with the printing plate cylinder, increases the contact pressure between the knurling cylinder 305 and the printing plate cylinder. At the same time, the end plates 304 on both sides restrict the position of the elastic ring 307, preventing the elastic ring 307 from detaching during the sliding of the inner sleeve 308 outside the sliding shaft 301.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gravure printing plate cylinder making device, characterized in that, include: The frame (1) has side plates (5) fixedly installed on both sides of the top of the frame (1), and a support plate (6) is fixedly installed on the outer side of the side plate (5), and a first motor (4) is fixedly installed on the top of the support plate (6). Knurling mechanism (3), which is used to roll and form uniform concave dots on the surface of the printing cylinder, and the knurling mechanism (3) is installed between the side plates (5); The engraving mechanism (2) is used to laser heat the concave points formed on the surface of the printing cylinder according to the printing plate program, and the engraving mechanism (2) is installed on the outside of the side plate (5). The top of each side plate (5) is provided with a groove, and a side groove block (8) is fixedly installed in each groove of the side plate (5). The top of each side groove block (8) is provided with a shaft groove, and a threaded rod (13) is fixedly installed on the inner wall of the side groove block (8). The threaded rod (13) is symmetrically installed along the center position of the axis of the side groove block (8). A pressure plate (10) is slidably installed in the shaft groove of the side groove block (8). Rod holes are provided on both sides of the top of the pressure plate (10). The rod holes of the pressure plate (10) are connected to the threaded rod. The outer side of the rod (13) is slidably fitted, and the inner wall of the pressure plate (10) is rotatably fitted with a collar (12). The inner wall of the collar (12) is rotatably fitted with a first bearing (11). The inner wall of the first bearing (11) is rotatably fitted with a fixed shaft (7). One end of the fixed shaft (7) is fixedly connected to the output end of the first motor (4) through a coupling. The outer side of the threaded rod (13) is threadedly connected with a threaded cylinder (9). The bottom of the threaded cylinder (9) is tightly fitted with the top of the pressure plate (10). The knurling mechanism (3) includes a sliding shaft (301), and two ends of the outer side of the sliding shaft (301) are rotatably mounted with second bearings (303). The two ends of the sliding shaft (301) are rotatably connected to the inner wall of the side plate (5) through the second bearings (303). An inner sleeve (308) is slidably mounted on the outer side of the sliding shaft (301). Inner gaskets (309) are rotatably installed at both ends of the outer side of the inner sleeve (308). An elastic ring (307) is snapped onto the outer side of the inner gasket (309). An outer gasket (306) is snapped onto the outer side of the elastic ring (307). A knurled cylinder (305) is fixedly installed on the outer side of the outer gasket (306). The outer side of the knurled cylinder (305) is uniformly provided with protrusions. Both ends of the knurling cylinder (305) are provided with annular grooves, and both ends of the knurling cylinder (305) are fixedly installed with end plates (304). The outer side of the end plates (304) is uniformly provided with through grooves, and there is a distance between the inner wall of the end plates (304) and the outer side of the sliding shaft (301). The knurling cylinder (305) is rotatably fitted with an outer ring (310) at the annular groove. A base plate (311) is fixedly installed at the bottom of the outer ring (310). A connecting crank (302) is fixedly installed on the outer side of the base plate (311). The end of the connecting crank (302) away from the base plate (311) is fixedly connected to the engraving mechanism (2).

2. The gravure printing plate cylinder making device according to claim 1, characterized in that: The engraving mechanism (2) includes a side support plate (202), which is fixedly installed on the outside of the side plate (5). A second motor (201) is fixedly installed on the outside of the side support plate (202). A lead screw (204) is rotatably installed between the side support plates (202). One end of the lead screw (204) is fixedly connected to the output end of the second motor (201), and a threaded hole block (205) is threadedly connected to the outside of the lead screw (204).

3. The gravure printing plate cylinder making device according to claim 2, characterized in that: A transverse convex plate (203) is fixedly installed between the side support plates (202). A convex strip is provided on the top of the transverse convex plate (203). A sliding groove block (206) is fixedly installed on the bottom of the wire hole block (205). A sliding groove is provided on the bottom of the sliding groove block (206), and the sliding groove of the sliding groove block (206) is slidably adapted to the convex strip of the transverse convex plate (203).

4. The gravure printing plate cylinder making device according to claim 3, characterized in that: A support block (207) is fixedly installed on the outer side of the wire hole block (205), and a laser head (208) is fixedly installed on the inner wall of the support block (207). A sliding hole plate (212) is fixedly installed on the outer side of the wire hole block (205) and the adjacent surface of the support block (207). Circular holes are symmetrically opened on the top of the outer side of the sliding hole plate (212).

5. The gravure printing plate cylinder making device according to claim 4, characterized in that: A sliding rod (211) is slidably installed at the round hole of the sliding plate (212). A connecting plate (213) is fixedly connected to one end of the sliding rod (211) near the fixed shaft (7), and a disc is provided at the other end of the sliding rod (211). A spring (210) is fixedly installed between the disc and the sliding plate (212). A sponge plate (209) is fixedly installed on the outside of the connecting plate (213).

6. A method for making a gravure printing plate cylinder, applicable to the gravure printing plate cylinder making apparatus of claim 1, characterized in that, It consists of the following steps: S1. Plate cylinder cleaning: The surface of the plate cylinder to be made is cleaned using cleaning equipment to remove impurities and oil stains attached to the surface of the plate cylinder, keeping the surface of the plate cylinder clean and avoiding oil stains from affecting plate making. S2. Plate cylinder installation: The required plate cylinder is manually installed into the plate-making device. While fixing the plate cylinder, the plate-making device drives the plate cylinder to rotate. S3. Printing cylinder knurling: The printing cylinder is rotated by the plate-making device. While rotating, the printing cylinder is in close contact with the knurling cylinder. Through rotation and contact pressure, the memory metal on the surface of the printing cylinder forms grid-like indentations. S4. Laser engraving: After the printing plate cylinder is knurled, a laser is used to heat the corresponding grid dots according to the graphic design program, so that the memory metal at the dots returns to flatness after being heated, and the unheated dots form the gravure printing pattern.

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