An ink supply device for a printing press

Abstract

The present application relates to a kind of printing machine ink supply device, including ink tank, plate roller and stirring rod, also including transmission rod and stirring barrel, transmission rod and stirring rod are engaged by transmission gear, the rubber layer of the outer periphery of transmission rod in ink tank is in contact with the outer surface of plate roller, the outer periphery of stirring rod in the ink tank is equipped with first brush, the feed hole and discharge hole of the ink tank are respectively connected with conveying pipe and discharge pipe, the discharge pipe is inserted into the upper end of stirring barrel, the upper surface center of the barrel cover of stirring barrel is connected with speed-regulating motor, the output shaft of speed-regulating motor is inserted into barrel body and is connected with conveying device, the conveying device is not interrupted to the ink in stirring barrel with stirring, filtering and pumping to ink tank by conveying pipe.The present application is a kind of printing machine ink supply device, which is easy to clean, saves operation time and improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of printing press technology, and more specifically to an ink supply device for a printing press. Background Technology

[0002] In the printing process, the ink supply system of a printing press mainly uses either direct immersion of the printing plate roller into the ink trough or immersion of the ink delivery roller into the ink trough for ink delivery, followed by contact printing between the printing plate roller and the printing material. However, during use, a small amount of ink sedimentation occurs in the ink trough, and a skin-like appearance forms on the ink surface, affecting ink quality. This phenomenon is particularly pronounced when the ink contains pearlescent powder or glitter. This causes ink to accumulate on the printing plate roller during subsequent printing processes, resulting in uneven ink distribution and quality problems such as unclear images, black spots, and dirt spots when printed onto the printing material. Therefore, an ink supply system is needed to ensure that the ink adheres evenly to the surface of the printing plate roller.

[0003] Patent application number 201920333228.0 discloses an ink supply device for a printing press, including an ink tank, a printing plate roller, and a stirring rod. The stirring rod is disposed inside the ink tank, and both ends of the stirring rod are rotatably connected to the ink tank. The printing plate roller is disposed above the stirring rod, and both ends of the printing plate roller are rotatably connected to the ink tank. The printing plate roller and the stirring rod are connected by a transmission device. A cloth sheet is disposed between the printing plate roller and the stirring rod, and the cloth sheet is attached to the bottom of the printing plate roller. A doctor blade is disposed on one side of the ink tank, and the doctor blade is inclined, with one end of the doctor blade in contact with the surface of the printing plate roller.

[0004] The above structure can solve the problem of skin formation in ink to a certain extent, but it has certain limitations in use. On the one hand, the ink tank is not easy to clean after the cloth is set. On the other hand, the stirring rod needs to be connected to the printing plate roller. When changing ink, changing printing plate roller, etc., the connection needs to be disassembled and reconnected. After reconnection, the tension of the connection needs to be adjusted, which increases the difficulty and operation time of changing ink or printing plate roller and slows down the work efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a printing press ink supply device, which aims to provide a convenient and easy-to-clean printing press ink supply device, saving operation time and improving work efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A printing press ink supply device includes an ink tank, a printing plate roller and a stirring rod. The printing plate roller is disposed above the stirring rod and is rotatably connected to the printing press. The lower part of the printing plate roller is located in the ink tank. The device also includes a transmission rod and a stirring tank. Both the transmission rod and the stirring rod are located inside the lower part of the ink tank and are rotatably connected to the ink tank. One end of the transmission rod and the stirring rod extends out of the ink tank and are respectively connected to a transmission gear. The transmission gear on the transmission rod and the transmission gear on the stirring rod mesh with each other. A rubber layer is fixed on the outer peripheral wall of the transmission rod located inside the ink tank. The rubber layer is in contact with the outer surface of the printing plate roller. There is a gap between the stirring rod and the printing plate roller. The outer periphery of the stirring rod inside the ink tank is provided with a first brush. The upper part of the two side walls of the ink tank is respectively provided with a feed hole and a discharge hole corresponding to both sides of the printing plate roller. The feed hole and the discharge hole are respectively connected to a conveying pipe and a discharge pipe. The lower end of the discharge pipe extends into the upper end of the stirring tank. The mixing tank includes a tank body and a tank lid. A speed-regulating motor is connected to the center of the upper surface of the tank lid. The output shaft of the speed-regulating motor extends into the tank body and is connected to a conveying device. The conveying device is connected to the lower end of a conveying pipe. The conveying device stirs and filters the ink in the mixing tank and pumps it into the ink tank through the conveying pipe.

[0007] Furthermore, the conveying device includes a housing, a filter screen, a driving gear, a driven gear, and a stirring paddle. The housing is a cylindrical body with closed upper and lower ends and an open side, formed by connecting the upper and lower surfaces of the side plates to the opposing surfaces of the upper and lower plates, respectively. A connecting pipe sleeved around the output shaft is fixedly connected between the upper plate and the lid. A filter screen is installed inside the side opening of the housing. The driving gear is located at the center inside the housing, and a meshing driven gear is provided on one side of the driving gear. The upper and lower end faces of both the driving gear and the driven gear are in sliding contact with the opposing surfaces of the upper and lower plates. Both the driving gear and the driven gear have rotating shafts inside. The shafts of both the driven gear and the driven gear are rotatably connected to the upper and lower plates. The upper end of the shaft of the driving gear is connected to the output shaft of the speed-regulating motor, and the lower end is connected to the stirring paddle located outside the outer casing. The driven gear is located on the inner wall of one end of the side plate. A first partition block is provided between the driven gear and the side plate end that is close to it. A second partition block is provided between the driving gear and the other end of the side plate. The lower end of the conveying pipe passes through the upper plate and connects the space between the first partition block and the second partition block. The driven gear slides in contact with the side of the first partition block facing the driven gear, and the driving gear slides in contact with the side of the second partition block facing the driving gear.

[0008] Furthermore, both the first and second partition blocks are block-shaped bodies. The upper and lower ends of the first and second partition blocks are fixedly connected to the surfaces opposite to the upper and lower plates, respectively. The side of the first and second partition blocks facing the side plate is fixedly connected to the side plate. The side of the first partition block facing the driven gear is an arc shape that matches the tip circle of the driven gear, and the side of the second partition block facing the driving gear is an arc shape that matches the tip circle of the driving gear.

[0009] Furthermore, the arc lengths of the side of the first partition block facing the driven gear and the side of the second partition block facing the driving gear are both greater than the two tooth pitches of the driving gear.

[0010] Furthermore, the stirring paddle includes a paddle body and paddle blades. The paddle body is a strip plate bent into a "U" shape. The horizontal section of the paddle body is fixedly connected to the lower end of the shaft of the drive gear, and the vertical section is connected to the paddle blades. The paddle blades are an arc-shaped plate formed by bending a rectangular plate into an arc shape. The vertical section of the paddle body is evenly distributed with second bristles that contact the outer peripheral wall of the outer shell.

[0011] Furthermore, the length of the first brush bristles is greater than the distance between the outer peripheral wall of the stirring rod and the outer peripheral wall of the printing plate roller. The outer end of the first brush bristles facing the transmission rod contacts the rubber layer on the transmission rod, and the outer end of the first brush bristles facing the inner wall of the ink tank contacts the inner wall of the ink tank.

[0012] Furthermore, the pitch circle diameter of the transmission gear on the transmission rod is larger than the pitch circle diameter of the transmission gear on the stirring rod, and the diameter of the circle containing the outer end of the first bristle is larger than the diameter of the circle containing the outer wall of the rubber layer of the transmission rod.

[0013] Furthermore, the first bristle is composed of a clump of bristles arranged in a continuous spiral along the outer wall of the stirring rod, and the clump of bristles is distributed radially.

[0014] Furthermore, two flip plates are hinged to the upper end of the ink tank, and the two flip plates are in an open state.

[0015] Furthermore, the diameter of the discharge hole is larger than the diameter of the feed hole.

[0016] The beneficial effects of the present invention through the above technical solution are as follows: This invention only requires the transmission rod to contact the printing plate roller for transmission, without needing to connect to the printing plate roller. This reduces the connection steps, allows for quick installation, saves operation time, and improves work efficiency.

[0017] The drive gear, driven gear, housing, first partition block and second partition block of the present invention constitute a gear pump. At the same time, the drive gear is located at the center of the housing, and the shaft of the drive gear drives the stirring paddle to rotate. The conveying device can simultaneously complete the stirring, filtering and pumping actions.

[0018] The stirring rod of this invention can not only stir the ink, but also brush the printing plate roller during production to remove impurities such as air bubbles or skins on the surface of the printing plate roller, so that the printing plate roller can fully contact the ink. The rubber layer on the transmission rod presses the ink into the recess of the printing plate roller. After the printing plate roller rotates past the transmission rod, it continues to contact the ink, so that the printing plate roller is fully covered with ink to meet the printing requirements.

[0019] This invention is easy to clean. After printing, the cleaning solution can be replaced and cleaning can be carried out quickly. Compared with the prior art, this invention does not require manual cleaning by workers to complete the cleaning of the printing plate roller and the mixing tank. Attached Figure Description

[0020] Figure 1 This is the front view of the present invention; Figure 2 This is the left view of the present invention; Figure 3 This is a cross-sectional left view of the present invention; Figure 4 yes Figure 3 Enlarged view of part A; Figure 5 This is a schematic diagram of the conveying device of the present invention; Figure 6 This is a sectional bottom view of the conveying device of the present invention; Figure 7 This is a schematic diagram of the structure of the stirring paddle of the present invention; Figure 8 This is a front view of the stirring rod of the present invention.

[0021] The attached diagram is labeled as follows: 1. Ink tank; 2. Printing plate roller; 3. Stirring rod; 4. Transmission rod; 5. Stirring tank; 6. First brush bristles; 7. Conveying pipe; 8. Discharge pipe; 9. Tank body; 10. Tank lid; 11. Speed ​​regulating motor; 12. Output shaft; 13. Connecting pipe; 14. Outer shell; 15. Filter screen; 16. Drive gear; 17. Driven gear; 18. Stirring paddle; 19. Upper plate; 20. Lower plate; 21. Side plate; 22. First partition block; 23. Second partition block; 24. Paddle body; 25. Paddle blade; 26. Second brush bristles; 27. Tilting plate; 28. Rubber layer; 29. ​​Discharge valve. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: It should be noted that the directional terms "front", "back", "left", "right", "up", "down", "bottom", and "top" used in the following description refer to the directions shown in the attached diagram, while the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0023] like Figures 1 to 8As shown, a printing press ink supply device includes an ink tank 1, a printing plate roller 2, and a stirring rod 3. The ink tank 1 contains ink. The printing plate roller 2 is positioned above the stirring rod 3 and is rotatably connected to the printing press. The lower part of the printing plate roller 2 is located inside the ink tank 1. The printing press is equipped with a bracket located below the printing plate roller 2 to support the ink tank 1, and the bracket is adjustable up and down. The length of the printing plate roller 2 is less than the length of the ink tank 1. The two ends of the printing plate roller 2 are not connected to the ink tank 1. The device also includes a transmission rod 4 and a stirring tank 5. The transmission rod 4 and the stirring rod 3 are both located in the lower part of the ink tank 1 and are rotatably connected to the ink tank 1. One end of the transmission rod 4 and the stirring rod 3 extends out of the ink tank 1 and is respectively connected to a transmission gear. The transmission gear on the transmission rod 4 and the transmission gear on the stirring rod 3 mesh with each other. A rubber layer 28 is fixed on the outer peripheral wall of the transmission rod 4 located in the ink tank 1. The rubber layer 28 is in contact with the outer surface of the printing plate roller 2. There is a gap between the stirring rod 3 and the printing plate roller 2. When the printing plate roller 2 rotates, it drives the transmission rod 4 to rotate. When the transmission rod 4 rotates, it drives the stirring rod 3 to rotate through the transmission gear. The stirring rod 3 in the ink tank 1 is provided with a first brush bristle 6 on its outer periphery. The upper part of the two side walls of the ink tank 1 is respectively provided with a feed hole and a discharge hole corresponding to the two sides of the printing plate roller 2. The feed hole and the discharge hole are both circular holes. The lower ends of the feed hole and the discharge hole are tangent to the liquid surface of the ink. The feed hole and the discharge hole are respectively connected to the conveying pipe 7 and the discharge pipe 8. The lower end of the discharge pipe 8 extends into the upper end of the stirring tank 5. The mixing tank 5 includes a tank body 9 and a tank cover 10. The lower end of the side wall of the tank body 9 is connected to a discharge valve 29. The center of the upper surface of the tank cover 10 is connected to a speed-regulating motor 11, which is connected to the mains power. The output shaft 12 of the speed-regulating motor 11 passes through the tank cover 10, extends into the tank body 9, and is connected to a conveying device. The conveying device is connected to the lower end of the conveying pipe 7. The conveying device continuously stirs and filters the ink in the mixing tank 5 and pumps it to the ink tank through the conveying pipe 7.

[0024] The conveying device includes a housing 14, a filter screen 15, a drive gear 16, a driven gear 17, and a stirring paddle 18. The housing 14 includes an upper plate 19, a lower plate 20, and side plates 21. Both the upper plate 19 and the lower plate 20 are circular plates. The housing 14 is formed by connecting the upper and lower ends of the side plates 21 to the opposite surfaces of the upper plate 19 and the lower plate 20, respectively, creating a cylindrical body that is closed at both ends and open on the sides. A connecting pipe 13, which is sleeved on the output shaft 12, is fixedly connected between the upper plate 19 and the lid 10. The upper end of the connecting pipe 13 is fixedly connected to the center of the lower surface of the lid 10, and the lower end is fixedly connected to the upper plate 19. A filter screen 15 is provided in the side opening of the outer casing 14. The side plate 21 is an arc-shaped plate formed by bending a rectangular plate into an arc. The filter screen 15 is also an arc-shaped filter screen. The filter screen 15 and the side plate 21 of the outer casing 14 are on the same circle. The driving gear 16 is located at the center inside the outer casing 14. A driven gear 17 is provided on one side of the driving gear 16. The upper and lower end faces of the driving gear 16 and the driven gear 17 are in sliding contact with the surfaces of the upper plate 19 and the lower plate 20. Both the driving gear 16 and the driven gear 17 are double pressure angle gears and each has a rotating shaft inside. The shafts of both the driven gear 16 and the driven gear 17 are rotatably connected to the upper plate 19 and the lower plate 20. The upper end of the shaft of the driving gear 16 passes through the center of the upper plate 19 and is connected to the output shaft 12 of the speed regulating motor 11. The lower end passes through the lower plate 20 and is connected to the stirring paddle 18 located outside the outer casing 14. The driven gear 17 is located near the inner wall of one end of the side plate 21. A first partition block 22 is provided between the driven gear 17 and the adjacent end of the side plate 21. A second partition block 23 is provided between the driving gear 16 and the other end of the side plate 21. The lower end of the conveying pipe 7 passes through the upper plate 19 and connects the first partition block 22 and the second partition block. The space between 23, the upper plate 19 is provided with a through hole connected to the conveying pipe 7, the driven gear 17 slides in contact with the side of the first partition block 22 facing the driven gear 17, the driving gear 16 slides in contact with the side of the second partition block 23 facing the driving gear 16, the driving gear 16, the driven gear 17, the outer shell 14, the first partition block 22 and the second partition block 23 together constitute a gear pump, and because the driving gear 16 of the gear pump is located at the center of the outer shell 14, the rotating shaft of the driving gear 16 drives the stirring paddle 18 to rotate, the conveying device can simultaneously complete the stirring, filtering and pumping actions.

[0025] Both the first partition block 22 and the second partition block 23 are block-shaped bodies. The upper and lower ends of the first partition block 22 and the second partition block 23 are fixedly connected to the surfaces opposite to the upper plate 19 and the lower plate 20, respectively. The side of the first partition block 22 and the second partition block 23 facing the side plate 21 are fixedly connected to the side plate 21. The side of the first partition block 22 facing the driven gear 17 is an arc shape that matches the tip circle of the driven gear 17. The side of the second partition block 23 facing the driving gear 16 is an arc shape that matches the tip circle of the driving gear 16.

[0026] The arc lengths of the first partition block 22 facing the driven gear 17 and the second partition block 23 facing the driving gear 16 are both greater than the two tooth pitches of the driving gear 16. This ensures the normal operation of the gear pump while reducing the volume of the first partition block 22 and the second partition block 23, thus ensuring sufficient filtration area and ink delivery space.

[0027] The stirring paddle 18 includes a paddle body 24 and paddle blades 25. The paddle body 24 is a strip plate bent into a "U" shape. The lower end of the shaft of the drive gear 16 is fixedly connected to the center of the horizontal section of the paddle body 24, and the paddle blades 25 are connected to the outer side of the vertical section. The paddle blades 25 are arc-shaped plates formed by bending rectangular plates into arcs. The inner side of the vertical section of the paddle body 24 is evenly distributed with second bristles 26 that contact the outer peripheral wall of the outer shell 14. The second bristles 26 can clean the filter screen 15 when the stirring paddle 18 rotates, so as to prevent the filter screen 15 from clogging.

[0028] The length of the first bristle 6 is greater than the distance between the outer peripheral wall of the stirring rod 3 and the outer peripheral wall of the printing plate roller 2. The outer end of the first bristle 6 facing the transmission rod 4 contacts the rubber layer 28 on the transmission rod 4, and the outer end of the first bristle 6 facing the inner wall of the ink tank 1 contacts the inner wall of the ink tank 1. The first bristle 6 can not only make the ink flow, but also clean the printing plate roller 2.

[0029] The pitch circle diameter of the transmission gear on the transmission rod 4 is larger than that of the transmission gear on the stirring rod 3, and the diameter of the circle containing the outer end of the first bristle 6 is larger than the diameter of the circle containing the outer wall of the rubber layer 28 of the transmission rod 4. This makes the rotational speed of the stirring rod 3 greater than that of the transmission rod 4. That is, the rotational linear velocity of the outer end of the first bristle 6 of the stirring rod 3 is greater than the rotational linear velocity of the outer peripheral wall of the rubber layer 28 of the transmission rod 4. The first bristle 6 can clean the outer peripheral wall of the rubber layer 28 of the transmission rod 4.

[0030] The first bristle 6 is composed of a clump of bristles arranged in a continuous spiral along the outer wall of the stirring rod 3. The clump of bristles is distributed radially, and the radially distributed clump of bristles increases the contact area with the printing plate roller 2 and the transmission rod 4, so that there are no dead corners in the cleaning.

[0031] The upper end of the ink tank 1 is hinged with two flip plates 27, which are in the open state.

[0032] The diameter of the discharge hole is larger than the diameter of the inlet hole, and the conveying pipe 7 is detachably connected to the inlet hole and the discharge pipe 8 is detachably connected to the discharge hole.

[0033] In use, ink is added to the mixing tank 5, and the ink tank 1 is placed on the bracket below the printing plate roller 2. The bracket is adjusted to move the ink tank 1 upward. When it moves to the point where the printing plate roller 2 contacts the transmission rod 4, it is stopped. The speed regulating motor 11 is started to make the conveying device run. The conveying device stirs, filters and pumps the ink in the mixing tank 5, so that the ink is transported from the mixing tank 5 to the ink tank 1. When the ink level in the ink tank 1 is higher than the lower end of the discharge hole, it will overflow from the discharge hole and flow back into the mixing tank 5 along the discharge pipe 8.

[0034] When the conveying device is running, the drive gear 16 rotates, meshing with the driven gear 17. The ink carried by the gaps between the teeth of the drive gear 16 slides between the second partition block 23 and the drive gear 16. Similarly, the ink carried by the gaps between the teeth of the driven gear 17 slides between the first partition block 22 and the driven gear 17. The drive gear 16 and driven gear 17 convey the ink from one side of the filter screen 15 to the other side of the side plate 21. Backflow of ink is not allowed at the meshing point between the drive gear 16 and the driven gear 17; the ink can only be conveyed outwards through the conveying pipe 7 between the second partition block 23 and the first partition block 22. The direction of ink conveying within the conveying device is as follows: Figure 6 As shown, the ink in the mixing tank 5 enters the outer casing 14 through the filter screen 15, and is then conveyed into the conveying pipe 7 by the drive gear 16 and the driven gear 17. The speed of the variable speed motor 11 is 10-15 revolutions per minute. This is to prevent the stirring paddle 18 in the mixing tank 5 from rotating too fast, and to prevent the conveying pipe 7 from feeding too much material and causing splashing. The conveying device only needs to ensure that the ink is conveyed slowly and that there is a backflow in the discharge pipe 8. In this way, the skin and impurities in the ink tank 1 can be returned to the mixing tank 5 to prevent them from affecting the printing.

[0035] After the printing press is started, the transmission rod 4 contacts and rotates with the printing plate roller 2. Since the transmission rod 4 and the stirring rod 3 are driven by the meshing of the transmission gear, the stirring rod 3 also rotates when the transmission rod 4 rotates. When the stirring rod 3 rotates, because the first bristles 6 on the stirring rod 3 are arranged in a spiral shape, the stirring rod 3 can push the ink to flow along the axial direction of the stirring rod 3, thus completing the stirring of the ink in the ink tank 1.

[0036] When the stirring rod 3 rotates, the first bristles 6 on the stirring rod 3 will brush the printing plate roller 2 to remove impurities such as air bubbles or skins carried on the surface of the printing plate roller 2, so that the printing plate roller 2 can fully contact the ink. The rubber layer 28 on the transmission rod 4 presses the ink into the recess of the printing plate roller 2. After the printing plate roller 2 passes the transmission rod 4, it continues to contact the ink, so that the printing plate roller 2 is fully covered with ink to meet the printing requirements.

[0037] After printing, the ink tank is tilted so that the ink in the ink tank is discharged into the barrel 9 through the discharge pipe 8, and then discharged from the barrel 9 through the discharge valve 29. Cleaning liquid is poured into the barrel 9, and the speed-regulating motor 11 is started. The gear pump consisting of the driving gear 16, driven gear 17, housing 14, first partition block 22 and second partition block 23 of the conveying device delivers the cleaning liquid into the ink tank 1. The drive device of the printing plate roller 2 of the printing press is started, and the printing plate roller 2 rotates, driving the transmission rod 4 and the stirring rod 3 to rotate. The first bristles 6 on the stirring rod 3 pick up the cleaning liquid and clean the transmission rod 4 and the printing plate roller 2. After cleaning is completed, the speed-regulating motor 11 is stopped. The drive device of the printing plate roller 2 of the printing press tilts the ink tank, so that the cleaning liquid in the ink tank is discharged into the barrel 9 through the discharge pipe 8. Then, the conveying pipe 7 is disassembled from the feed hole, the barrel cover is opened, and the conveying pipe 7 is pulled out from the barrel cover. Holding the outlet end of the conveying pipe 7, it is aligned with the inner wall of the barrel 9. The speed regulating motor 11 is started again. When the conveying device is conveying the cleaning liquid, the conveying pipe 7 rinses the inside of the barrel 9. The cleaning liquid rinsed inside the barrel 9 remains inside the barrel 9. The cleaning liquid only circulates and cleans within the barrel 9 and the conveying device. After cleaning, the cleaning liquid is discharged through the discharge valve 29. The cleaning work of the printing plate roller 2 and the mixing barrel 5 can be completed without the worker having to manually touch the cleaning liquid.

[0038] When not using this application, adjust the bracket to move the ink tank 1 downwards and away from the printing plate roller 2. Then, flip the two flip plates 27 relative to each other along the hinge with the ink tank 1. When the free ends of the two flip plates 27 rest on the upper ends of the front and rear side plates of the ink tank 1, a closed structure is formed to close the upper opening of the ink tank 1, preventing ink evaporation in the ink tank 1, reducing pollution in the workshop, and ensuring the health of workers.

[0039] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made to the technical solutions of the present invention without departing from the spirit of the present invention or the scope of disclosure.

Claims

1. A printing press ink supply device, comprising an ink tank (1), a printing plate roller (2), and a stirring rod (3), wherein the printing plate roller (2) is disposed above the stirring rod (3), the printing plate roller (2) is rotatably connected to the printing press, and the lower part of the printing plate roller (2) is located within the ink tank (1), characterized in that, It also includes a transmission rod (4) and a mixing tank (5); The transmission rod (4) and stirring rod (3) are both located in the lower part of the ink tank (1) and are rotatably connected to the ink tank (1). One end of the transmission rod (4) and stirring rod (3) extends out of the ink tank (1) and is connected to a transmission gear. The transmission gear on the transmission rod (4) and the transmission gear on the stirring rod (3) mesh with each other. A rubber layer (28) is fixed on the outer peripheral wall of the transmission rod (4) located in the ink tank (1). The rubber layer (28) is in contact with the outer surface of the printing plate roller (2). There is a gap between the stirring rod (3) and the printing plate roller (2). The stirring rod (3) in the ink tank (1) is provided with a first brush bristle (6) on its outer periphery. The upper part of the two side walls of the ink tank (1) is provided with feed holes and discharge holes corresponding to the two sides of the printing plate roller (2). The feed holes and discharge holes are respectively connected to the conveying pipe (7) and the discharge pipe (8). The lower end of the discharge pipe (8) extends into the upper end of the stirring tank (5). The mixing tank (5) includes a tank body (9) and a tank cover (10). A speed-regulating motor (11) is connected to the center of the upper surface of the tank cover (10). The output shaft (12) of the speed-regulating motor (11) extends into the tank body (9) and is connected to a conveying device. The conveying device is connected to the lower end of the conveying pipe (7). The conveying device stirs and filters the ink in the mixing tank (5) and pumps it into the ink tank (1) through the conveying pipe (7). The conveying device includes a housing (14), a filter screen (15), a drive gear (16), a driven gear (17), and a stirring paddle (18). The housing (14) is a cylindrical body with closed upper and lower ends and open sides, formed by connecting the upper and lower ends of the side plate (21) to the opposing surfaces of the upper plate (19) and the lower plate (20) respectively. A connecting pipe (13) sleeved on the output shaft (12) is fixedly connected between the upper plate (19) and the barrel cover (10). A filter screen (15) is provided in the side opening of the housing (14). The drive gear (16) is located in the center inside the housing (14). A meshing driven gear (17) is provided on one side of the drive gear (16). The upper and lower end faces of the drive gear (16) and the driven gear (17) are in sliding contact with the opposing surfaces of the upper plate (19) and the lower plate (20). The drive gear (16) and the driven gear (17) are both provided with rotating shafts inside. The driven gear (17) is rotatably connected to the upper plate (19) and the lower plate (20). The upper end of the shaft of the driving gear (16) is connected to the output shaft (12) of the speed regulating motor (11), and the lower end is connected to the stirring paddle (18) located outside the outer shell (14). The driven gear (17) is close to the inner wall of the side plate (21). A first partition block (22) is provided between the driven gear (17) and the side plate (21) that is close to it. A second partition block (23) is provided between the driving gear (16) and the other end of the side plate (21). The lower end of the conveying pipe (7) passes through the upper plate (19) and connects the space between the first partition block (22) and the second partition block (23). The driven gear (17) slides in contact with the side of the first partition block (22) facing the driven gear (17), and the driving gear (16) slides in contact with the side of the second partition block (23) facing the driving gear (16). The stirring paddle (18) includes a paddle body (24) and paddle blades (25). The paddle body (24) is a strip plate bent into a "U" shape. The horizontal section of the paddle body (24) is fixedly connected to the lower end of the shaft of the drive gear (16), and the vertical section is connected to the paddle blades (25). The paddle blades (25) are arc-shaped plates bent into an arc shape. The vertical section of the paddle body (24) is evenly distributed with second bristles (26) that contact the outer peripheral wall of the outer shell (14).

2. The ink supply device for a printing press according to claim 1, characterized in that, The first partition block (22) and the second partition block (23) are both block-shaped bodies. The upper and lower ends of the first partition block (22) and the second partition block (23) are fixedly connected to the surfaces opposite to the upper plate (19) and the lower plate (20), respectively. The side of the first partition block (22) and the second partition block (23) facing the side plate (21) are fixedly connected to the side plate (21). The side of the first partition block (22) facing the driven gear (17) is an arc shape that matches the tooth tip circle of the driven gear (17). The side of the second partition block (23) facing the driving gear (16) is an arc shape that matches the tooth tip circle of the driving gear (16).

3. The ink supply device for a printing press according to claim 2, characterized in that, The arc lengths of the side of the first partition block (22) facing the driven gear (17) and the side of the second partition block (23) facing the driving gear (16) are both greater than the two tooth pitches of the driving gear (16).

4. The ink supply device for a printing press according to claim 1, characterized in that, The length of the first bristle (6) is greater than the distance between the outer peripheral wall of the stirring rod (3) and the outer peripheral wall of the printing plate roller (2). The outer end of the first bristle (6) facing the transmission rod (4) contacts the rubber layer (28) on the transmission rod (4), and the outer end of the first bristle (6) facing the inner wall of the ink tank (1) contacts the inner wall of the ink tank (1).

5. The ink supply device for a printing press according to claim 1, characterized in that, The pitch circle diameter of the transmission gear on the transmission rod (4) is greater than the pitch circle diameter of the transmission gear on the stirring rod (3), and the diameter of the circle where the outer end of the first bristle (6) is located is greater than the diameter of the circle where the outer wall of the rubber layer (28) of the transmission rod (4) is located.

6. The ink supply device for a printing press according to claim 1, characterized in that, The first bristle (6) is composed of a clump of bristles arranged in a continuous spiral along the outer wall of the stirring rod (3), and the clump of bristles is distributed radially.

7. The ink supply device for a printing press according to claim 1, characterized in that, The ink tank (1) has two hinged flip plates (27) at its upper end, and the two flip plates (27) are in the open state.

8. The ink supply device for a printing press according to claim 1, characterized in that, The diameter of the discharge hole is larger than the diameter of the feed hole.

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