Printing roller for paper printing

Abstract

This utility model discloses a printing roller for paper printing, belonging to the printing field. The printing roller includes a printing sleeve and a fixed roller disposed within the printing sleeve and abutting against the inner wall of the printing sleeve. By connecting the rollers, this utility model allows for flexible adjustment of the effective working length of the printing roller according to different paper sizes, significantly improving the applicability and efficiency of the printing roller. During continuous printing, the printing sleeve generates a large amount of heat due to friction, which is conducted to the fixed roller and the connecting roller. Using a guide device, cooling airflow can be precisely introduced into the internal cavity of the rollers, effectively removing the accumulated heat through forced convection heat transfer, thereby indirectly cooling the printing sleeve. Furthermore, a positioning mechanism ensures that the paper maintains a stable position during printing, effectively preventing deviation and further improving printing accuracy and operational stability.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a printing roller for paper printing. Background Technology

[0002] Printing is a technology that uses processes such as plate making, inking, and pressing to transfer ink to the surface of materials such as paper, textiles, plastics, leather, PVC, and PC, to mass-produce the content of the original manuscript, including text, pictures, photographs, and anti-counterfeiting materials.

[0003] In the paper printing process, the printing roller, as the core component, usually adopts a composite structure of a metal shaft and an elastic rubber sleeve covering the surface. Its working principle relies on the microporous structure on the surface of the rubber sleeve to adsorb and release ink and dampening solution, thereby achieving precise coating and printing on the paper surface.

[0004] In actual production, the continuous operation of printing rollers over a long period of time will cause the surface temperature of the rubber sleeve to rise significantly. This temperature rise effect will not only accelerate the aging and wear of the rubber sleeve material, but also directly affect the quality stability of the printed products. In addition, due to the fixed structure design of traditional printing rollers, it is necessary to frequently replace the printing rollers of the corresponding specifications when facing different printing requirements, which will increase the cost of use. Secondly, printing rollers are not convenient for paper positioning during use, and paper displacement is prone to occur during high-speed printing, which will lead to deviations in the printed pattern. Utility Model Content

[0005] The purpose of this invention is to address the problem that in the existing technology, printing rollers are mostly designed with a fixed structure, which requires frequent replacement of printing rollers of corresponding specifications when facing different printing needs, thereby increasing the cost of use. Therefore, this invention proposes a printing roller for paper printing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A printing roller for paper printing includes a printing sleeve and a fixed roller disposed inside the printing sleeve and abutting against the inner wall of the printing sleeve. The fixed roller has connecting rollers threadedly connected to both ends of the fixed roller and the printing sleeve. Both the fixed roller and the connecting roller have flow guides that slow down airflow when external gas enters them. A positioning cylinder is threadedly connected to the end of the connecting roller away from the fixed roller. The end of the positioning cylinder away from the connecting roller is detachably connected to a roller shaft. The positioning cylinder has a positioning element for limiting the position of the paper.

[0008] To guide the airflow inside the fixed roller and the connecting roller, preferably, the guide includes a spiral blade disposed inside the fixed roller and the connecting roller, wherein the outer surface of the spiral blade abuts against the inner wall of the fixed roller and the connecting roller.

[0009] To further improve the stability of the helical blades, reinforcing ribs are fixedly connected to the inner side of the helical blades.

[0010] To limit the movement of the printing paper on both sides, preferably, the positioning element includes a nut threaded onto the positioning cylinder, and a limiting disc is fixedly connected to the side of the nut near the connecting roller.

[0011] To facilitate the rotation of the nut by the workers, the nut is further hexagonal in shape.

[0012] To facilitate the assembly and disassembly of the roller shaft, preferably, the roller shaft is fixedly mounted on the positioning cylinder by bolts.

[0013] To facilitate the entry of external gas into the fixed roller and the connecting roller, preferably, the number of rollers is two, and they are hollow structures.

[0014] In order to supply air to the inside of the fixed roller and the connecting roller, preferably, a sealing cover is fixedly sleeved on one of the roller shafts, and an air guide pipe is rotatably connected to the end of the sealing cover away from the roller shaft.

[0015] To facilitate the removal of gas from the fixed roller and the connecting roller, preferably, a ventilation groove is provided on the surface of another roller.

[0016] To further improve exhaust efficiency, the number of ventilation slots is two to four.

[0017] Compared with the prior art, the present invention provides a printing roller for paper printing, which has the following beneficial effects:

[0018] 1. This printing roller for paper printing, through the threaded connection between the fixed roller and the connecting roller, allows for flexible adjustment of the effective working length of the printing roller for different paper sizes, significantly improving the applicability and efficiency of the printing roller.

[0019] 2. This printing roller for paper printing, through the setting of the flow guide, can guide the airflow to form a specific flow path inside the printing roller. On the one hand, it reduces the flow efficiency of the airflow and prolongs the heat exchange time; on the other hand, it enhances the heat exchange intensity between the airflow and the inner wall of the printing roller. Through this efficient heat exchange method, indirect cooling of the printing sleeve can be achieved, which not only effectively improves the heat accumulation problem in the printing process, but also significantly improves the quality of the printed product and extends the service life of the sleeve.

[0020] 3. The printing roller for paper printing, through the setting of the positioning frame, when the operator rotates the nut, the nut moves axially along the outer surface of the positioning cylinder, thereby driving the limit plate to move synchronously. This adjustable design can flexibly adjust the limit position according to different paper specifications, effectively preventing paper displacement deviation during the printing process and ensuring the registration accuracy and quality stability of the printed products.

[0021] The parts of this device not described herein are the same as or can be implemented using existing technologies. This utility model, through the setting of the connecting roller, can flexibly adjust the effective working length of the printing roller according to different paper specifications, significantly improving the applicability and efficiency of the printing roller. During continuous printing operations, the printing sleeve generates a large amount of heat due to friction. This heat is conducted to the fixed roller and the connecting roller. By using the setting of the guide component, the cooling airflow can be accurately introduced into the internal cavity of the roller. Through forced convection heat transfer, the accumulated heat is effectively removed, thereby achieving indirect cooling of the printing sleeve. In addition, the positioning mechanism can ensure that the paper maintains a stable position during the printing process, effectively preventing deviation and further improving printing accuracy and operational stability. Attached Figure Description

[0022] Figure 1 This is an isometric schematic diagram of a printing roller for paper printing according to the present invention.

[0023] Figure 2 This is a partial exploded view of the structure of a printing roller for paper printing according to the present invention.

[0024] Figure 3 This utility model proposes a printing roller for paper printing. Figure 2 Enlarged view of the structure at point A in the middle;

[0025] Figure 4 This is a partially exploded cross-sectional view of a printing roller for paper printing according to the present invention.

[0026] Figure 5 This is a cross-sectional schematic diagram of the fixed roller of a printing roller for paper printing proposed in this utility model.

[0027] In the diagram: 1. Printing sleeve; 2. Fixed roller; 3. Connecting roller; 4. Spiral blade; 41. Reinforcing rib; 5. Positioning cylinder; 6. Roller shaft; 7. Nut; 71. Limiting plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0030] Example:

[0031] Reference Figures 1-5 A printing roller for paper printing includes a printing sleeve 1 made of polyurethane, which is characterized by wear resistance, tear resistance, impact resistance, and good stability. It also includes a fixed roller 2, disposed inside the printing sleeve 1 and abutting against the inner wall of the printing sleeve 1. The printing sleeve 1 is fitted onto the surface of the fixed roller 2. Connecting rollers 3, which are threaded to both ends of the fixed roller 2 and connected to the printing sleeve 1, are also threaded together. This threaded connection allows for easy adjustment of the number of connecting rollers 3 according to paper specifications, thus reducing the operating cost of the printing roller. Both the fixed roller 2 and the connecting rollers 3 are equipped with air guides. When external gas enters the fixed roller 2 and the connecting rollers 3, the air guides slow down the airflow and improve heat dissipation for the printing roller and the sleeve. A positioning device is threaded onto the end of the connecting roller 3 furthest from the fixed roller 2. The positioning cylinder 5 has a detachable roller shaft 6 at one end away from the connecting roller 3. The roller shaft 6 is fixedly installed on the positioning cylinder 5 with bolts, which facilitates disassembly of the roller shaft 6 by the operator. There are two roller shafts 6, which are hollow structures. After the roller shafts 6 are connected to the positioning cylinder 5, their interiors are open, allowing external gas to enter and dissipate heat from the printing roller. One of the roller shafts 6 is fixedly fitted with a sealing cover. The end of the sealing cover away from the roller shaft 6 is rotatably connected to a duct. After the duct is connected to an external fan, gas enters the printing roller and carries away the internal heat, thereby assisting the external printing sleeve 1 in heat dissipation. The surface of the other roller shaft 6 has ventilation slots, with two to four slots, preferably four, for venting the gas inside the printing roller and improving the cooling efficiency of the printing roller. The positioning cylinder 5 is equipped with a positioning component for limiting the paper position.

[0032] Specifically, by setting up the connecting roller 3, the effective working length of the printing roller can be flexibly adjusted according to different paper specifications, significantly improving the applicability and efficiency of the printing roller. During continuous printing operations, the printing sleeve 1 generates a large amount of heat due to friction. This heat is conducted to the fixed roller 2 and the connecting roller 3. By using the guide component, the cooling airflow can be accurately introduced into the internal cavity of the roller. The accumulated heat is effectively removed through forced convection heat transfer, thereby indirectly cooling the printing sleeve 1. In addition, the positioning mechanism can ensure that the paper maintains a stable position during the printing process, effectively preventing deviation and further improving printing accuracy and operational stability.

[0033] The guide includes a spiral blade 4 disposed in the fixed roller 2 and the connecting roller 3. The outer surface of the spiral blade 4 abuts against the inner wall of the fixed roller 2 and the connecting roller 3. A reinforcing rib 41 is fixedly connected to the inner side of the spiral blade 4. The reinforcing rib 41 can improve the stability of the spiral blade 4 in use.

[0034] Specifically, by setting up the flow guide, when the external fan delivers gas into the roller 6, the airflow forms a specific flow path under the guidance of the spiral blades 4. This design reduces the flow efficiency of the airflow and prolongs the heat exchange time. On the other hand, it enhances the heat exchange intensity between the airflow and the inner wall of the roller, thereby significantly improving the internal heat exchange effect of the fixed roller 2 and the connecting roller 3. Through this efficient heat exchange method, indirect cooling of the printing sleeve 1 can be achieved, which not only effectively improves the heat accumulation problem in the printing process, but also significantly improves the quality of the printed product and extends the service life of the sleeve.

[0035] The positioning component includes a nut 7 threaded onto the positioning cylinder 5. A limit plate 71 is fixedly connected to the side of the nut 7 near the connecting roller 3. The nut 7 is hexagonal in shape, and the hexagonal design makes it convenient for workers to rotate and adjust the nut 7.

[0036] Specifically, by setting up the positioning frame, when the operator rotates the nut 7, the nut 7 moves axially along the outer surface of the positioning cylinder 5, thereby driving the limit plate 71 to move synchronously. This adjustable design can flexibly adjust the limit position according to different paper sizes, effectively preventing paper displacement deviation during the printing process and ensuring the registration accuracy and quality stability of the printed matter.

[0037] Working principle: When using the printing roller, the operator first connects one of the roller shafts 6 to an external drive device. With the power of the external drive device, the printing roller rotates, thereby realizing the printing operation on the paper. At the same time, during the printing process, the operator puts the sealing cover on the other roller shaft 6 and starts the fan connected to the sealing cover. After the fan starts, cooling gas is input into the air duct. Under the guidance of the spiral blades 4, the gas forms a specific flow path. This forced convection heat transfer method can efficiently remove the heat inside the fixed roller 2 and the connecting roller 3, thereby indirectly cooling the printing sleeve 1. This not only significantly improves the service life of the printing sleeve 1 and reduces the cost and time loss caused by frequent replacement, but also greatly improves the printing quality of the paper.

[0038] When the staff needs to print on paper of different sizes, they remove the roller 6 and the positioning cylinder 5 in sequence. Then, according to the specific size of the paper, they increase the number of connecting rollers 3. When the total length of the connecting roller 3 and the fixed roller 2 is exactly the same as the width of the paper, the matching printing sleeve 1 is put on the surface of the roller. After that, the positioning cylinder 5 and the roller 6 are installed back in their original positions in sequence.

[0039] After the printing rollers are assembled, the operator rotates the nut 7, which moves axially along the outer surface of the positioning cylinder 5. This allows for adjustment of the position of the limiting disc 71. By adjusting the position of the limiting disc 71, the paper can be limited on both sides, effectively preventing the paper from shifting during the printing process and ensuring the registration accuracy and quality of the printed matter.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A printing roller for paper printing, comprising a printing sleeve (1), characterized in that, Also includes: A fixed roller (2) is disposed inside the printing sleeve (1) and abuts against the inner wall of the printing sleeve (1). The fixed roller (2) is threaded to both ends of a connecting roller (3) that is connected to the printing sleeve (1). Both the fixed roller (2) and the connecting roller (3) are provided with guides. When external gas enters the fixed roller (2) and the connecting roller (3), the guides are used to slow down the airflow. A positioning cylinder (5) is threadedly connected to the end of the connecting roller (3) away from the fixed roller (2). The positioning cylinder (5) is detachably connected to a roller shaft (6) at one end away from the connecting roller (3). The positioning cylinder (5) is provided with a positioning element, which is used to limit the paper position.

2. The printing roller for paper printing according to claim 1, characterized in that, The guide component includes spiral blades (4) disposed within the fixed roller (2) and the connecting roller (3). The outer surface of the spiral blade (4) abuts against the inner wall of the fixed roller (2) and the connecting roller (3).

3. A printing roller for paper printing according to claim 2, characterized in that, The inner side of the spiral blade (4) is fixedly connected with a reinforcing rib (41).

4. A printing roller for paper printing according to claim 1, characterized in that, The positioning component includes a nut (7) threaded onto the positioning cylinder (5), and a limit plate (71) is fixedly connected to the side of the nut (7) near the connecting roller (3).

5. A printing roller for paper printing according to claim 4, characterized in that, The nut (7) is hexagonal in shape.

6. A printing roller for paper printing according to claim 1, characterized in that, The roller (6) is fixedly mounted on the positioning cylinder (5) by bolts.

7. A printing roller for paper printing according to claim 1, characterized in that, The number of rollers (6) is two, and they are hollow.

8. A printing roller for paper printing according to claim 1, characterized in that, A sealing cover is fixedly fitted on one of the rollers (6), and an air guide pipe is rotatably connected to the end of the sealing cover away from the roller (6).

9. A printing roller for paper printing according to claim 1, characterized in that, The surface of the other roller (6) is provided with ventilation grooves.

10. A printing roller for paper printing according to claim 9, characterized in that, The number of ventilation slots is two to four.

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