A letterpress printing machine

Abstract

The utility model relates to printing machine technical field especially relates to a relief printing machine, including chassis, paper feed mechanism, ink delivery mechanism, impression cylinder, paper pressing mechanism and UV drying mechanism, paper feed mechanism rolls and set up in the chassis, ink delivery mechanism sets up in the chassis, impression cylinder rolls and sets up above paper feed mechanism, paper pressing mechanism sets up in paper feed mechanism and is connected with printing plant body roll, UV drying mechanism sets up in one side of impression cylinder, the utility model discloses through paper feed mechanism continuous conveying printing carrier reduces manual intervention mistake, ensures the efficiency and quality of printing, and paper pressing mechanism real -time detection thickness adjusts parameter to guarantee printing quality consistency, and impression cylinder precision transfer printing ink completes printing process, and UV drying mechanism fast solidification printing ink shortens printing cycle, effectively solved the problem such as printing carrier conveying uneven, printing quality is not good, printing cycle long etc. in background art.

Description

Technical Field

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

[0002] In traditional letterpress printing, there are many problems in the processes of transporting the printing medium, supplying ink, and curing it. Traditional printing methods rely heavily on manual operation to transport the printing medium, which is not only inefficient but also prone to uneven transport and inaccurate positioning, resulting in inconsistent print quality.

[0003] Furthermore, during the printing process, it is difficult to monitor the thickness of the printing substrate in real time, making it impossible to adjust printing parameters promptly for substrates of varying thicknesses, thus affecting printing quality. Additionally, the slow ink curing speed is a significant challenge; traditional drying methods require considerable time, greatly extending the printing cycle and reducing overall printing efficiency. Therefore, ensuring printing efficiency and quality, improving the real-time accuracy of printing substrate thickness monitoring, and accelerating ink curing speed have become urgent technical problems to be solved in the letterpress printing field, necessitating improvements. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a letterpress printing machine. This machine utilizes a paper feeding mechanism to continuously transport the printing medium, reducing human error and ensuring printing efficiency and quality. A paper pressing mechanism monitors the thickness in real time to adjust parameters and ensure consistent printing quality. An impression cylinder precisely transfers ink to complete the printing process, and a UV drying mechanism rapidly cures the ink, shortening the printing cycle. This effectively solves problems such as uneven printing medium transport, poor printing quality, and long printing cycles found in the prior art.

[0005] To achieve the above objectives, this utility model provides a letterpress printing machine, which includes a chassis, a paper feeding mechanism, an ink feeding mechanism, an impression cylinder, a paper pressing mechanism, and a UV drying mechanism.

[0006] The paper delivery mechanism is rotatably mounted on the chassis and is used to transport the printing substrate;

[0007] The ink feeding mechanism is mounted on the chassis and is used to feed ink to the impression cylinder;

[0008] The impression cylinder is rotatably positioned above the paper feeding mechanism for printing on the printing substrate;

[0009] The paper pressing mechanism is disposed on the paper feeding mechanism and is rotatably connected to the printing substrate, and is used to detect the thickness of the printing substrate;

[0010] The UV drying mechanism is located on one side of the impression cylinder and is used to cure the ink on the printing substrate to form printed matter.

[0011] Preferably, the paper delivery mechanism includes a drive roller, a driven roller, and a conveyor belt;

[0012] The drive roller and the driven roller are respectively rotatably mounted on the chassis;

[0013] The conveyor belt is sleeved between the drive roller and the driven roller;

[0014] The drive roller drives the conveyor belt to rotate, and the driven roller rotates along with the conveyor belt.

[0015] Preferably, the ink supply mechanism includes an ink transfer frame, an ink container, an ink fountain, an ink equalization roller, an ink transfer roller, an ink distribution roller, and an ink application roller;

[0016] The chassis is provided with a first bracket and a second bracket, wherein the height of the first bracket is higher than the height of the second bracket.

[0017] The ink transfer frame is rotatably disposed between the first support and the second support;

[0018] The part positioned on top of the first bracket is used to deliver ink to the ink fountain;

[0019] The ink fountain, ink distribution roller, ink transfer roller, ink distribution roller, ink application roller, and impression cylinder are arranged in a rolling and contacting manner along the ink transfer frame from high to low.

[0020] The ink fountain is provided with an ink outlet, and the ink equalization roller is disposed inside the ink fountain and partially exposed outside the ink outlet.

[0021] Preferably, the ink container is provided with an ink delivery pipe, an ink return pipe, and an ink return pump;

[0022] The ink delivery tube is connected between the ink container and the ink fountain, and is used to deliver the ink in the ink container to the ink fountain;

[0023] The ink return pump is located at the top of the ink container, and the ink return pipe is connected between the ink return pump and the ink fountain.

[0024] Preferably, a fine-tuning driver for adjusting the height of the ink transfer frame is provided at the connection between the second bracket and the ink transfer frame.

[0025] The second bracket is provided with adjustment holes;

[0026] The fine-tuning driver is rotatably connected to the second bracket and drives the ink transfer frame to rise and fall via the adjustment hole.

[0027] Preferably, a paper stabilizing roller is also provided between the impression cylinder and the UV drying mechanism, and the chassis is provided with an adjustment groove, with both ends of the paper stabilizing roller respectively fixed in the adjustment groove.

[0028] Preferably, both ends of the adjusting groove are provided with sliding holes, the chassis is provided with an adjusting column, the adjusting groove is slidably connected to the adjusting column through the sliding holes for raising and lowering, and a locking bolt that abuts against the adjusting column is screwed into the sliding hole.

[0029] Preferably, the paper pressing mechanism includes a sliding frame, a first paper pressing roller, a second paper pressing roller, and a displacement sensor;

[0030] The sliding frame is vertically fixed to the chassis;

[0031] The first and second paper pressing rollers are respectively rolled on the front and back sides of the conveyor belt. The first paper pressing roller slides up and down along the sliding frame and abuts against the front side of the conveyor belt, while the second paper pressing rollers abut against the back side of the conveyor belt.

[0032] The displacement sensor is used to measure the amount of displacement of the first pressure roller as it slides up and down along the sliding frame after pressing the printing carrier.

[0033] Preferably, a detection frame is provided on one side of the UV drying mechanism, and the detection frame is equipped with an inspection camera for acquiring defects in the printed carrier.

[0034] Preferably, the UV drying mechanism includes a UV lamp and a heat sink disposed on top of the UV lamp.

[0035] The beneficial effects of this utility model are as follows: the continuous feeding mechanism of the printing carrier reduces human intervention errors and ensures printing efficiency and quality; the paper pressing mechanism detects the thickness in real time to adjust parameters to ensure consistent printing quality; the impression cylinder accurately transfers ink to complete the printing process; and the UV drying mechanism quickly cures the ink to shorten the printing cycle. This effectively solves the problems of uneven feeding of the printing carrier, poor printing quality, and long printing cycle in the background technology. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of this utility model.

[0037] Figure 2 This is a schematic diagram of the chassis and ink supply mechanism of this utility model.

[0038] Figure 3 This is a schematic diagram of the chassis, paper pressing mechanism, and paper stabilizing roller of this utility model.

[0039] The reference numerals in the figures include:

[0040] 1. Chassis; 11. First bracket; 12. Second bracket; 121. Adjustment hole; 13. Fine-tuning driver; 14. Adjustment slot; 141. Sliding hole; 15. Adjustment column; 16. Locking bolt; 17. Inspection frame; 18. Inspection camera; 19. Support roller;

[0041] 2. Paper feeding mechanism; 21. Drive roller; 22. Driven roller; 23. Conveyor belt;

[0042] 3. Ink feeding mechanism; 31. Ink transfer frame; 32. Ink container; 321. Ink delivery tube; 322. Ink return tube; 323. Ink return pump; 33. Ink fountain; 34. Ink leveling roller; 35. Ink transfer roller; 36. Ink distribution roller; 37. Ink application roller;

[0043] 4. Imprinting cylinder;

[0044] 5. Paper pressing mechanism; 51. Sliding frame; 52. First paper pressing roller; 53. Second paper pressing roller; 54. Displacement sensor;

[0045] 6. UV drying mechanism; 61. UV lamp; 62. Radiator;

[0046] 7. Paper stabilizing roller. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings.

[0048] like Figures 1 to 3 As shown, the present invention provides a letterpress printing machine, which includes a chassis 1, a paper feeding mechanism 2, an ink feeding mechanism 3, an impression cylinder 4, a paper pressing mechanism 5, and a UV drying mechanism 6.

[0049] The paper delivery mechanism 2 is mounted on the chassis 1 and is used to transport the printing media. The rolling motion ensures smooth and continuous transport of the printing media, reducing manual intervention, improving transport efficiency, and avoiding uneven transport caused by human error.

[0050] The ink supply mechanism 3 is located on the chassis 1 and is used to supply ink to the impression cylinder 4. The ink is delivered to the impression cylinder 4 through the ink supply mechanism 3. This ensures a continuous and stable ink supply to the impression cylinder 4, resulting in clear and uniform printed patterns and improving printing quality.

[0051] The impression cylinder 4 is rotatably positioned above the paper feeding mechanism 2 for printing on the printing substrate; the paper pressing mechanism 5 prints on the conveyed printing substrate. This ensures accurate transfer of ink to the printing substrate, completing the printing process and guaranteeing printing precision and quality.

[0052] The paper pressing mechanism 5 is located on the paper feeding mechanism 2 and is tumblingly connected to the printing carrier. It is used to detect the thickness of the printing carrier. The paper pressing mechanism 5 detects the thickness of the printing carrier during the rolling process. It can obtain the thickness information of the printing carrier in real time so as to adjust the printing parameters in a timely manner and ensure the consistency of printing quality.

[0053] The UV drying unit 6 is located on one side of the impression cylinder 4 and is used to cure the ink on the printing substrate to form the printed product. The UV drying unit 6 uses ultraviolet light to cure the ink on the printing carrier to form the printed product. This method can quickly cure the ink, shorten the printing cycle, improve production efficiency, and also give the cured ink printed products good wear resistance and chemical corrosion resistance.

[0054] During operation, the paper feeding mechanism 2 is activated to transport the printing substrate; as the printing substrate passes the paper pressing mechanism 5, the substrate's height information is detected in real time to facilitate adjustment of the height of the impression cylinder 4; the ink feeding mechanism 3 starts working, accurately extracting ink and delivering it to the impression cylinder 4; the impression cylinder 4 rotates, and when the printing substrate reaches below the impression cylinder 4, the impression cylinder 4 and the printing substrate make close contact to complete the ink transfer printing; the printed substrate forms a printed product and is moved to the area below the UV drying mechanism, where ultraviolet light emitted by a mercury lamp or LED lamp excites the photoinitiator in the ink, triggering a polymerization reaction to quickly cure the ink, giving the printed product a wear-resistant and chemically resistant pattern.

[0055] like Figure 1 As shown, the paper feeding mechanism 2 in this embodiment includes a drive roller 21, a driven roller 22, and a conveyor belt 23.

[0056] The drive roller 21 and the driven roller 22 are respectively rolled on the chassis 1;

[0057] The conveyor belt 23 is fitted between the drive roller 21 and the driven roller 22;

[0058] The drive roller 21 drives the conveyor belt 23 to rotate, and the driven roller 22 rotates along with the conveyor belt 23.

[0059] The drive roller 21 is rolled on the chassis 1 and provides power through its own rotation. It provides a stable driving force for the entire paper feeding mechanism 2, ensuring that the conveyor belt 23 can operate at the set speed and direction, thus guaranteeing the stability and accuracy of the printing carrier transport. The drive roller 21 can be a direct-drive module, with the motor output shaft connected to the drive roller 21, and the motor rotation driving the drive roller 21 to rotate synchronously; alternatively, it can be a drive module with a motor and a reducer, where the reducer adjusts the motor output speed and torque to obtain suitable rotation parameters for the drive roller 21.

[0060] The driven roller 22 serves to support the conveyor belt 23, ensuring its smooth operation. It also rotates passively with the conveyor belt 23 without consuming additional energy, thus ensuring the overall coordination of the paper delivery mechanism 2.

[0061] The conveyor belt 23 is fitted between the drive roller 21 and the driven roller 22, and the rotation of the drive roller 21 drives the conveyor belt 23 to rotate continuously. It can continuously and smoothly transport the printing carrier, accurately deliver the printing carrier to the designated position, and meet the requirements of the printing process.

[0062] like Figure 2 and Figure 3 As shown, the ink feeding mechanism 3 in this embodiment includes an ink transfer frame 31, an ink container 32, an ink fountain 33, an ink distribution roller 34, an ink transfer roller 35, an ink distribution roller 36, and an ink application roller 37.

[0063] The chassis 1 is provided with a first bracket 11 and a second bracket 12, the height of the first bracket 11 being higher than the height of the second bracket 12;

[0064] The ink transfer frame 31 is rotatably positioned between the first support 11 and the second support 12; utilizing the height difference between the first support 11 and the second support 12, the ink transfer frame 31 is tilted. A bearing-equipped rotating shaft module can be conventionally used, mounting the two ends of the ink transfer frame 31 onto the first support 11 and the second support 12 via bearings to achieve smooth rotation; alternatively, a universal joint connection module can be used, allowing the ink transfer frame 31 to rotate flexibly at different angles.

[0065] The ink fountain 33 is positioned at the top of the first support 11 and is used to supply ink to the ink fountain 33. Ink from the ink container 32 is delivered to the ink fountain 33 by gravity or pumping. This ensures a continuous and stable supply of ink to the ink fountain 33, preventing ink shortage and guaranteeing a continuous ink supply during the printing process.

[0066] The ink fountain 33, ink distribution roller 34, ink transfer roller 35, ink distribution roller 36, inking roller 37, and impression cylinder 4 are arranged in a rolling, contacting manner along the ink transfer frame 31 from high to low. Ink is transferred between the rollers through rolling contact, and the high-to-low arrangement utilizes gravity to assist ink flow. This ensures that the ink is evenly transferred to the impression cylinder 4, guaranteeing the clarity and uniformity of the printed pattern and improving printing quality.

[0067] The ink fountain 33 is equipped with an ink outlet, and the ink distribution roller 34 is disposed inside the ink fountain 33 and partially exposed outside the ink outlet. The ink distribution roller 34 is partially immersed in the ink in the ink fountain 33, and carries the ink out when it rotates. This allows for precise control of the amount of ink entering the ink transfer system, avoiding too much or too little ink and ensuring the stability of printing quality.

[0068] Specifically, the ink distribution roller 34, ink transfer roller 35, ink distribution roller 36, and ink application roller 37 are all nano-level ceramic coated rollers, which enhance the wear resistance of the ink distribution roller 34, ink transfer roller 35, ink distribution roller 36, and ink application roller 37.

[0069] like Figure 2 and Figure 3 As shown, the ink container 32 in this embodiment is provided with an ink delivery tube 321, an ink return tube 322, and an ink return pump 323.

[0070] The ink delivery tube 321 connects the ink container 32 and the ink fountain 33, and is used to deliver ink from the ink container 32 to the ink fountain 33. The ink delivery tube 321 forms an ink transfer channel, and the ink in the ink container 32 flows to the ink fountain 33 along the ink delivery tube 321 using pressure difference, such as gravity or pressure generated by a pump. This ensures a stable and continuous delivery of ink from the ink container 32 to the ink fountain 33, guaranteeing sufficient ink in the ink fountain 33 for printing and preventing ink shortages from affecting printing quality and efficiency.

[0071] A return ink pump 323 is located at the top of the ink container 32, and a return ink pipe 322 connects the return ink pump 323 and the ink fountain 33. When the return ink pump 323 is working, it generates suction, drawing excess ink from the ink fountain 33 back to the ink container 32 through the return ink pipe 322. This effectively controls the amount of ink in the ink fountain 33, preventing excessive ink overflow and waste, and also allows for ink recycling, maintaining ink uniformity and activity, thus improving printing quality.

[0072] like Figure 1 and Figure 2 As shown, in this embodiment, a fine-tuning driver 13 for adjusting the height of the ink transfer frame 31 is provided at the connection between the second support 12 and the ink transfer frame 31. The fine-tuning driver 13 generates driving force to change the relative positional relationship between the ink transfer frame 31 and the second support 12. This allows for precise adjustment of the height of the ink transfer frame 31, thereby controlling the spacing between the rollers on the ink transfer frame 31 and components such as the impression cylinder 4, to adapt to the ink transfer requirements of printing carriers of different thicknesses and different printing processes, thus improving printing quality and flexibility.

[0073] The second bracket 12 is provided with an adjustment hole 121; the adjustment hole 121 provides movement space and guidance for the fine-tuning driver 13 to drive the ink transfer frame 31 to rise and fall. This ensures that the ink transfer frame 31 moves smoothly along the predetermined direction during the rising and falling process, avoiding deviation or shaking, and ensuring the accuracy and stability of the height adjustment of the ink transfer frame 31.

[0074] The fine-tuning driver 13 is rotatably connected to the second bracket 12 and drives the ink transfer frame 31 to rise and fall via the adjustment hole 121. When the fine-tuning driver 13 rotates, its output end applies a force to the ink transfer frame 31 through the adjustment hole 121, causing the ink transfer frame 31 to rise or fall. This allows for precise adjustment of the height of the ink transfer frame 31, is easy to operate, and has high adjustment accuracy, meeting the needs for precise control of ink transfer during the printing process.

[0075] Among them, the fine-tuning driver 13 can be a screw fine-tuning micrometer module, which achieves precise linear displacement output by rotating the micrometer drum and using the screw transmission principle, thereby driving the ink transfer frame 31 to rise and fall; or it can be a worm gear fine-tuning module, which has self-locking properties, can ensure the stability of the position of the ink transfer frame 31 after adjustment, and can achieve fine height adjustment by rotating the worm.

[0076] like Figure 1 and Figure 3 As shown, in this embodiment, a paper stabilizing roller 7 is also provided between the printing roller 4 and the UV drying mechanism 6, and the chassis 1 is provided with an adjusting groove 14. The two ends of the paper stabilizing roller 7 are respectively fixed in the adjusting groove 14.

[0077] By utilizing the contact between the paper stabilizing roller 7 and the printing carrier, a certain tension and guiding effect is applied to the carrier through the rotation of the paper stabilizing roller 7. This effectively prevents problems such as shaking, deviation, or wrinkling of the printing carrier during the transfer of the printing carrier from the impression cylinder 4 to the UV drying mechanism, ensuring that the printing carrier enters the UV drying mechanism smoothly and accurately, thereby improving the quality of the printed matter and the drying effect.

[0078] In actual use, the chassis 1 is equipped with a support roller 19 corresponding to the paper stabilizing roller 7. The support roller 19 supports the conveyor belt 23, so as to prevent the conveyor belt 23 from bending and affecting the conveying of the printing carrier when the paper stabilizing roller 7 rotates and applies a certain tension and guiding effect to the carrier.

[0079] The adjusting groove 14 provides an adjustable mounting position for the paper stabilizing roller 7. The position of the paper stabilizing roller 7 can be flexibly adjusted according to the specifications, thickness, and transport conditions of the printing substrate, thereby better controlling the tension and transport path of the printing substrate and enhancing the adaptability of the equipment to different printing tasks.

[0080] like Figure 1 and Figure 3 As shown, both ends of the adjusting groove 14 in this embodiment are provided with sliding holes 141, and the chassis 1 is provided with an adjusting column 15. The adjusting groove 14 is slidably connected to the adjusting column 15 through the sliding holes 141, and a locking bolt 16 that abuts against the adjusting column 15 is screwed into the sliding holes 141.

[0081] The sliding hole 141 provides a sliding connection channel between the adjusting groove 14 and the adjusting column 15 on the chassis 1. This allows the adjusting groove 14 to slide up and down along the adjusting column 15, thereby achieving preliminary adjustment of the height of the paper stabilizing roller 7 and providing a basis for adapting to different specifications of printing carriers or printing process requirements.

[0082] The adjusting column 15 serves as a guide and support component for the sliding of the adjusting groove 14. It ensures that the adjusting groove 14 remains directionally stable during sliding, preventing any deviation and ensuring the accuracy of the height adjustment of the paper stabilizing roller 7, thereby guaranteeing the stability of the printing carrier transmission.

[0083] After the adjusting groove 14 slides to the appropriate height, rotate the locking bolt 16 to make the adjusting groove 14 tightly abut against the adjusting column 15, and use friction to fix the adjusting groove 14 on the adjusting column 15. This allows for convenient height adjustment of the adjusting groove 14, and also allows for secure locking of the adjusting groove 14 after adjustment, preventing the position of the adjusting groove 14 from changing due to equipment vibration or other reasons during the printing process, thus ensuring the stability of the printing process and the printing quality.

[0084] like Figure 3 As shown, the paper pressing mechanism 5 in this embodiment includes a sliding frame 51, a first paper pressing roller 52, a second paper pressing roller 53, and a displacement sensor 54.

[0085] The sliding frame 51 is vertically fixed to the chassis 1; the sliding frame 51 provides a vertical sliding track and support structure for the first pressure roller 52. This ensures that the first pressure roller 52 can move stably in the vertical direction, thereby precisely controlling the pressure on the printing carrier on the conveyor belt 23 and adapting to the pressure requirements of printing carriers of different thicknesses.

[0086] The first pressure roller 52 and the second pressure roller 53 are respectively rolled relative to each other on the front and back sides of the conveyor belt 23. The first pressure roller 52 slides up and down along the sliding frame 51 via a slider and abuts against the front side of the conveyor belt 23, while the second pressure roller 53 abuts against the back side of the conveyor belt 23. Through the combined action of the first pressure roller 52 and the second pressure roller 53 on the front and back sides of the conveyor belt 23, rolling friction is used to reduce damage to the printing carrier. At the same time, the sliding of the first pressure roller 52 can adjust the pressure force. This effectively fixes the printing carrier, preventing it from shifting, wrinkling, or jumping during transport, improving printing accuracy and quality, and allowing for flexible adjustment of the pressure effect according to different situations.

[0087] The displacement sensor 54 is used to measure the displacement of the first pressure roller 52 as it slides up and down along the sliding frame 51 after pressing over the printing carrier. The displacement sensor 54 can sense the position change of the first pressure roller 52 and convert the position change into an electrical signal. The displacement of the first pressure roller 52 can be monitored in real time, and the operator can obtain the thickness data of the printing carrier based on the displacement.

[0088] The displacement sensor 54 can be a lever-type displacement sensor 54 module. The lever-type displacement sensor 54 measures the displacement by extending and retracting the lever. It can be directly connected to the first paper pressure roller 52 to accurately measure the sliding displacement of the first paper pressure roller 52. It has the advantages of high measurement accuracy and fast response speed. Alternatively, a magnetostrictive displacement sensor 54 module can be used. The magnetostrictive displacement sensor 54 uses the magnetostrictive effect to measure displacement. It is not affected by environmental factors such as oil and dust, and can work stably in harsh working environments to ensure the reliability of the measurement.

[0089] like Figure 1 As shown, a detection frame 17 is provided on one side of the UV drying mechanism 6 in this embodiment, and the detection frame 17 is equipped with an inspection camera 18 for acquiring defects in the printing carrier.

[0090] The inspection frame 17 provides a stable mounting position and a suitable inspection angle for the inspection camera 18, allowing the inspection camera 18 to be aimed at the surface of the printed material after UV drying. This ensures that the camera performs comprehensive and accurate inspection of the printed material from a fixed position, avoiding problems such as missed inspection areas or unclear inspection due to improper installation, and improving the reliability of the inspection.

[0091] The inspection camera 18 captures images of the printed surface, allowing subsequent staff to analyze the images using image processing algorithms to identify defects such as ink spots, scratches, and color differences. This enables real-time and rapid detection of quality issues, timely identification of anomalies in the production process, and prompt adjustments to equipment parameters or other measures to improve printing quality and production efficiency.

[0092] like Figure 1 As shown, the UV drying mechanism 6 in this embodiment includes a UV lamp 61 and a heat sink 62 disposed on top of the UV lamp 61. The UV lamp 61 emits ultraviolet light of a specific wavelength, which can excite the photoinitiator in the ink, causing the photoinitiator to undergo a chemical reaction, thereby rapidly curing and drying the ink. This achieves rapid drying of ink on printed materials, improves printing production efficiency, avoids problems such as smudging and sticking caused by undried ink, and ensures the quality of printed materials. The UV lamp 61 generates a large amount of heat during operation. The heat sink 62 dissipates the heat generated by the UV lamp 61 by increasing the heat dissipation area and accelerating airflow, thereby reducing the operating temperature of the UV lamp 61. This prevents the UV lamp 61 from being damaged due to overheating, extends the service life of the UV lamp 61, and ensures that the UV lamp 61 can stably emit ultraviolet light, maintaining a good drying effect.

[0093] UV lamp 61 can be a mercury lamp module, which emits high-intensity ultraviolet light and is suitable for printing applications requiring high drying speed and effect, such as large-format printing and high-speed printing; or it can be an LED-UV lamp module, which has advantages such as energy saving, environmental protection, and long life. Heat sink 62 can be a finned heat sink module or a cooling fan.

[0094] In actual use, the printing press is also equipped with a main control module, which is a programmable logic controller (PLC). The main control module is electrically connected to the paper feeding mechanism 2, the inking mechanism 3, the impression cylinder 4, the paper pressing mechanism 5, and the UV drying mechanism 6. The main control module is equipped with a network module, through which the working status of the printing press and the mechanisms can be viewed in real time, which facilitates the maintenance of the printing press.

[0095] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A letterpress printing machine, characterized in that, It includes a chassis (1), a paper feeding mechanism (2), an ink feeding mechanism (3), an impression cylinder (4), a paper pressing mechanism (5), and a UV drying mechanism (6). The paper delivery mechanism (2) is rotatably mounted on the chassis (1) for conveying the printing substrate; The ink feeding mechanism (3) is disposed on the chassis (1) and is used to feed ink to the impression cylinder (4); The impression cylinder (4) is rotatably positioned above the paper feeding mechanism (2) for printing on the printing substrate; The paper pressing mechanism (5) is disposed on the paper feeding mechanism (2) and is tumbledly connected to the printing substrate, and is used to detect the thickness of the printing substrate; The UV drying mechanism (6) is located on one side of the impression cylinder (4) and is used to cure the black ink on the printing substrate to form printed matter.

2. The letterpress printing machine according to claim 1, characterized in that, The paper feeding mechanism (2) includes a drive roller (21), a driven roller (22), and a conveyor belt (23); The drive roller (21) and the driven roller (22) are respectively rolled on the chassis (1). The conveyor belt (23) is fitted between the drive roller (21) and the driven roller (22); The drive roller (21) drives the conveyor belt (23) to rotate, and the driven roller (22) rotates along with the conveyor belt (23).

3. A letterpress printing machine according to claim 1, characterized in that, The ink feeding mechanism (3) includes an ink transfer frame (31), an ink container (32), an ink fountain (33), an ink equalization roller (34), an ink transfer roller (35), an ink distribution roller (36), and an ink application roller (37). The chassis (1) is provided with a first bracket (11) and a second bracket (12), wherein the height of the first bracket (11) is higher than the height of the second bracket (12); The ink transfer frame (31) is rotatably disposed between the first support (11) and the second support (12); The part disposed on the top of the first bracket (11) is used to supply ink to the ink fountain (33); The ink fountain (33), ink distribution roller (34), ink transfer roller (35), ink flow roller (36), ink application roller (37), and impression cylinder (4) are arranged in a rolling contact manner from high to low along the ink transfer frame (31); The ink fountain (33) is provided with an ink outlet, and the ink equalization roller (34) is disposed inside the ink fountain (33) and partially exposed outside the ink outlet.

4. A letterpress printing machine according to claim 3, characterized in that, The ink container (32) is provided with an ink delivery tube (321), an ink return tube (322), and an ink return pump (323); The ink delivery tube (321) is connected between the ink container (32) and the ink fountain (33) and is used to deliver the ink in the ink container (32) to the ink fountain (33). The ink return pump (323) is located on top of the ink container (32), and the ink return tube (322) is connected between the ink return pump (323) and the ink fountain (33).

5. A letterpress printing machine according to claim 3, characterized in that, A fine-tuning driver (13) for adjusting the height of the ink transfer frame (31) is provided at the connection between the second bracket (12) and the ink transfer frame (31). The second bracket (12) is provided with an adjustment hole (121); The fine-tuning driver (13) is rotatably connected to the second bracket (12) and drives the ink transfer frame (31) to rise and fall through the adjustment hole (121).

6. A letterpress printing machine according to claim 1, characterized in that, A paper stabilizing roller (7) is also provided between the printing roller (4) and the UV drying mechanism (6). The chassis (1) is provided with an adjusting groove (14), and the two ends of the paper stabilizing roller (7) are respectively fixed in the adjusting groove (14).

7. A letterpress printing machine according to claim 6, characterized in that, Both ends of the adjusting groove (14) are provided with sliding holes (141), and the chassis (1) is provided with an adjusting column (15). The adjusting groove (14) is slidably connected to the adjusting column (15) through the sliding hole (141) and the adjusting column (15) is screwed with a locking bolt (16) that abuts against the adjusting column (15).

8. A letterpress printing machine according to claim 2, characterized in that, The paper pressing mechanism (5) includes a sliding frame (51), a first paper pressing roller (52), a second paper pressing roller (53), and a displacement sensor (54). The sliding frame (51) is vertically fixed to the chassis (1); The first paper pressing roller (52) and the second paper pressing roller (53) are respectively rolled on the front and back of the conveyor belt (23). The first paper pressing roller (52) slides up and down along the sliding frame (51) and abuts against the front of the conveyor belt (23). The second paper pressing roller (53) abuts against the back of the conveyor belt (23). The displacement sensor (54) is used to measure the displacement of the first pressure roller (52) as it slides up and down along the sliding frame (51) after pressing the printing carrier.

9. A letterpress printing machine according to claim 1, characterized in that, A detection frame (17) is provided on one side of the UV drying mechanism (6), and the detection frame (17) is equipped with an inspection camera (18) for obtaining defects in the printing carrier.

10. A letterpress printing machine according to claim 1, characterized in that, The UV drying mechanism (6) includes a UV lamp (61) and a heat sink (62) disposed on top of the UV lamp (61).

Images