Environment-friendly paper product printing apparatus and method of use thereof

Abstract

The present application relates to paper product printing equipment technical field, especially to an environment-friendly paper product printing equipment and its using method. It includes the guard shield assembly which is arranged on the ink duct groove and is composed of the installation frame, the extension frame, the left side guard shield, the right side guard shield and two baffle plates; the scraping assembly which is arranged on the guard shield assembly and is used for adjusting the ink thickness on the surface of the ink transfer roller; the lifting assembly which is arranged on the installation frame and is used for adjusting the distance between the left side guard shield, the right side guard shield and the surface of the ink transfer roller to complete the sealing of the upper part of the ink duct groove; and the ink transmission mechanism which is arranged on the ink duct groove and is used for transmitting the ink to the surface of the ink transfer roller. The present application can avoid the ink splashing, save the ink resources, form a relatively closed space above the ink duct groove when the ink transfer roller is not used, reduce the contact between the ink and the outside world, and reduce the volatilization of the ink.

Description

Technical Field

[0001] This invention relates to the field of paper product printing equipment technology, and in particular to an environmentally friendly paper product printing equipment and its usage method. Background Technology

[0002] With social development, people's environmental awareness is constantly increasing, and they are beginning to advocate environmental protection in their lives and work. As a result, some products are gradually becoming more environmentally friendly, including paper products. Environmentally friendly paper refers to paper that has a small impact on the environment during its manufacturing and use. It is usually made from renewable, recyclable, and eco-friendly raw materials. Compared with traditional paper, environmentally friendly paper is more environmentally friendly and healthier, and can effectively reduce its impact on the environment and human body. The products produced from it are environmentally friendly paper products, such as some publications, ancient books, and packaging decorations. In the production process of these paper products, printing technology is needed to add patterns, text, and other information to the paper, and printing operations require the use of printing equipment.

[0003] Currently, in the operation of printing presses, ink needs to be supplied to the printing rollers via an ink supply system. The printing rollers then press and press the ink onto the paper to complete the printing process. However, existing ink supply systems still have shortcomings. For example, in the prior art, there is an automatic ink supply device for printing presses (publication number: CN220548806U), which includes an ink tank made of a stainless steel trapezoidal groove. The inner wall of the stainless steel trapezoidal groove is coated with a non-stick ink layer. A limiting ink outlet is located at the upper end of the stainless steel trapezoidal groove, and several slag outlets are located on the lower surface of the stainless steel trapezoidal groove. An automatic cleaning device is installed inside the stainless steel trapezoidal groove, which includes two doctor blades and a power source. A crystallized ink collection cylinder is located at the bottom of the stainless steel trapezoidal groove. This invention ensures ink supply by limiting the ink outlet. When ink is continuously supplied into the stainless steel trapezoidal groove through the pipeline, the ink volume within the groove remains constant, preventing ink from overflowing from the top and causing waste. The automatic cleaning device eliminates the need for manual disassembly of the ink tank baffle, replacing manual cleaning of the stainless steel trapezoidal groove. Furthermore, the crystallizing ink collection cylinder allows for rapid discharge of the crystallized ink. Although this automatic ink supply device limits the ink outlet, it ensures that the ink volume within the stainless steel trapezoidal groove remains constant while the ink supply pipeline continuously supplies ink, preventing ink from overflowing from the top and causing waste. The automatic cleaning device eliminates the need for manual disassembly of the ink tank baffle, replacing manual cleaning of the stainless steel trapezoidal groove. The crystallizing ink collection cylinder allows for rapid discharge of the crystallized ink.

[0004] However, in actual use, the ink is prone to evaporation. When the ink transfer roller is not in use, there is a large gap between the ink fountain and the ink transfer roller. This gap can easily lead to ink evaporation, wasting resources and costs. In addition, ink that has been in contact with the external environment for a long time is also easily affected by the external environment, such as dust, which will affect the subsequent printing effect. Summary of the Invention

[0005] To address the problems existing in the background technology, an environmentally friendly paper product printing equipment and its usage method are proposed.

[0006] This invention proposes an environmentally friendly paper product printing equipment, comprising: a protective cover assembly mounted on the ink fountain, consisting of a mounting frame, an extension frame, a left protective cover, a right protective cover, and two baffles; a scraping assembly mounted on the protective cover assembly for adjusting the ink thickness on the surface of the ink transfer roller; a lifting assembly mounted on the mounting frame for sealing the area above the ink fountain by adjusting the distance between the left and right protective covers and the surface of the ink transfer roller; an ink transfer mechanism mounted on the ink fountain for transferring ink to the surface of the ink transfer roller; and an ink agitation mechanism mounted on the ink fountain and connected to the left and right protective covers, driven by the lifting assembly for agitating the ink.

[0007] Preferably, the scraping assembly consists of a squeegee disposed on the left protective cover and a scraper disposed on the right protective cover. The side of the squeegee closest to the ink transfer roller is set as an inclined surface, the top of the scraper is set as an inclined surface, and the side of the scraper closest to the ink transfer roller is set as an arc surface, and the arc surface is in contact with the surface of the ink transfer roller.

[0008] Preferably, the ink delivery mechanism includes a connecting frame installed on the ink fountain, the connecting frame communicating with the ink fountain, a recycling frame installed on the connecting frame, the recycling frame communicating with the connecting frame, a discharge frame installed on the recycling frame, a filter frame installed on the connecting frame, a feed pump installed on the connecting frame, the inlet of the feed pump communicating with the filter frame, a feed pipe installed on the outlet of the feed pump, a connecting pipe installed at the other end of the feed pipe, the connecting pipe communicating with the left protective cover, and multiple inkjet printheads installed on the connecting pipe.

[0009] Preferably, the lifting assembly includes a mounting plate mounted on a mounting frame, an adjusting screw rotatably mounted on the mounting plate, an adjusting plate threaded onto the adjusting screw, the adjusting plate being connected to the left protective cover, an adjusting motor mounted on the mounting plate, and the output shaft of the adjusting motor being connected to one end of the adjusting screw.

[0010] Preferably, the juice stirring mechanism includes a transmission rod installed on the left and right protective covers, and the transmission rod is driven to rise and fall by the left and right protective covers. A connecting cylinder is installed on the transmission rod, and a telescopic rod is slidably installed on the connecting cylinder. A telescopic spring is provided inside the connecting cylinder, one end of the telescopic spring is connected to the telescopic rod, a cleaning plate is installed at the end of the telescopic rod away from the connecting cylinder, and an stirring rod is installed on the connecting cylinder.

[0011] Preferably, the cleaning plate is composed of multiple cleaning plates and multiple connecting plates arranged at equal intervals. The multiple connecting plates are respectively installed on the outer wall of the multiple cleaning plates on the side that is close to each other. The top of the multiple cleaning plates is set as an inclined surface, and the cleaning plates are in contact with the inner wall of the ink fountain.

[0012] Preferably, the extension frame is made of frame-shaped silicone cloth.

[0013] Preferably, an ink discharge frame is installed on the ink fountain groove, an ink discharge pipe is installed on the ink discharge frame, and a valve is installed on the ink discharge pipe.

[0014] Preferably, both the left and right protective covers are arc-shaped, and the side of the left and right protective covers that are close to each other is an arc-shaped surface, which is adapted to the surface of the ink transfer roller.

[0015] The above-described method for using an environmentally friendly paper product printing equipment includes the following steps:

[0016] S1. Convey the prepared ink into the ink fountain;

[0017] S2. Ink is delivered to the surface of the ink transfer roller through the ink delivery mechanism. The ink transfer roller rotates to deliver the ink to the printing roller for printing.

[0018] S3. Adjust the height of the protective cover assembly through the lifting mechanism, and then adjust the distance between the scraping assembly and the surface of the ink transfer roller to ensure the uniformity of ink on the surface of the ink transfer roller.

[0019] S4. When the ink transfer roller stops working, the left and right protective covers are lowered by the lifting mechanism and come into contact with the surface of the ink transfer roller, forming a relatively enclosed space above the ink fountain groove.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The protective cover assembly can form a protective barrier on the top of the ink fountain, preventing ink from splashing out of the ink fountain during the rotation of the ink transfer roller and reducing ink waste.

[0022] By adjusting the motor, adjusting screw, and adjusting plate, the height of the left and right protective covers can be adjusted. When the ink transfer roller is not in use, the protective cover assembly can form a relatively enclosed space above the ink fountain, reducing the contact between ink and the external environment and reducing ink evaporation.

[0023] The height of the smear can be indirectly adjusted by adjusting the height of the left protective cover. The thickness of the ink on the surface of the ink transfer roller can be adjusted by adjusting the smear, thereby making the ink on the surface of the ink transfer roller more uniform and improving the ink transfer effect of the ink transfer roller.

[0024] By using a feed pump to deliver ink, the ink in the ink fountain can be made to flow. This flow of ink makes the ink in the ink fountain more uniform. At the same time, with the action of the filter frame and discharge frame, impurities in the ink are filtered and collected. This can better remove impurities from the ink, improve the quality of the ink, and indirectly ensure the printing effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 for Figure 1 The diagram shows an enlarged view of part A.

[0027] Figure 3 This is a schematic diagram of the protective cover assembly in this invention;

[0028] Figure 4 This is a schematic diagram of the ink fountain groove in this invention;

[0029] Figure 5 This is a schematic diagram of the structure of the left protective cover in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the right-side protective cover in this invention;

[0031] Figure 7 This is a schematic diagram of the structure of the connecting frame, the recycling frame, and the discharge frame in this invention;

[0032] Figure 8 This is a schematic diagram of the ink agitation component in this invention;

[0033] Figure 9 This is a side sectional view of the present invention.

[0034] Reference numerals: 1. Ink fountain; 201. Mounting frame; 202. Extension frame; 203. Left protective cover; 204. Right protective cover; 205. Baffle; 3. Ink inlet pipe; 4. Ink transfer roller; 5. Connecting frame; 6. Recycling frame; 7. Discharge frame; 8. Filter frame; 9. Feed pump; 10. Feed pipe; 11. Connecting pipe; 12. Inkjet nozzle; 13. Scraper; 14. Fixing frame; 15. Buffer spring; 16. Moving block; 17. Scraper; 18. Ink discharge frame; 19. Ink discharge pipe; 20. Mounting plate; 21. Adjusting plate; 22. Adjusting screw; 23. Adjusting motor; 24. Connecting cylinder; 25. Telescopic rod; 26. Telescopic spring; 27. Stirring rod; 28. Cleaning plate; 29. ​​Transmission rod. Detailed Implementation

[0035] Example 1

[0036] like Figures 1-6 As shown, the present invention proposes an environmentally friendly paper product printing equipment, including a protective cover assembly mounted on the ink fountain trough 1, comprising a mounting frame 201, an extension frame 202, a left protective cover 203, a right protective cover 204, and two baffles 205. The mounting frame 201 is mounted on the ink fountain trough 1 by multiple bolts, and both sides of the mounting frame 201 contact the two end surfaces of the ink transfer roller 4, thus better ensuring the sealing effect of the protective cover assembly. The extension frame 202 is mounted above the mounting frame 201, and the two baffles 205 are installed between the left protective cover 203 and the right protective cover 204. The bottom of each component is connected to the extension frame 202, which is made of frame-shaped silicone cloth. The left protective cover 203 and the right protective cover 204 are both arc-shaped, and the side of the left protective cover 203 and the right protective cover 204 that are close to each other is set as an arc surface, which is adapted to the surface of the ink transfer roller 4. A scraping component is set on the protective cover assembly to adjust the ink thickness on the surface of the ink transfer roller 4. A lifting component is set on the mounting frame 201 to complete the sealing of the top of the ink fountain 1 by adjusting the distance between the left protective cover 203 and the right protective cover 204 and the surface of the ink transfer roller 4. An ink transfer mechanism is set on the ink fountain 1 to transfer ink to the surface of the ink transfer roller 4.

[0037] like Figure 5 and Figure 6As shown, the scraping assembly consists of a scraper 13 mounted on the left protective cover 203 and a scraper 17 mounted on the right protective cover 204. The side of the scraper 13 closest to the ink transfer roller 4 is sloped, and the top of the scraper 17 is sloped. The side of the scraper 17 closest to the ink transfer roller 4 is curved, and the curved surface contacts the surface of the ink transfer roller 4. Two fixed frames 14 are mounted on the right protective cover 204. Sliding rods are fixedly mounted on the inner walls of the two fixed frames 14. Moving blocks 16 are slidably mounted on the two sliding rods. The tops of the two moving blocks 16 are connected to the scraper 17. Buffer springs 15 are sleeved on the two sliding rods. One end of each buffer spring 15 is fixedly connected to the outer wall of one side of the moving block 16. The other end of the spring 15 is fixedly connected to the inner wall of one side of each of the two fixed frames 14. The squeegee 13 is also connected to the left protective cover 203 in the same way. There is a certain space between the scraper 17 and the right protective cover 204 and between the squeegee 13 and the left protective cover 203 to facilitate retraction and avoid obstructing the descent of the protective cover assembly. With the setting of the buffer spring 15 and the moving block 16, the scraper 17 and the squeegee 13 can be in a movable state. At the same time, the scraper 17 can be in closer contact with the surface of the ink transfer roller 4. The scraper 17 can scrape off the ink on the surface of the ink transfer roller 4, preventing the ink from adhering to the surface of the ink transfer roller 4 for a long time and then drying and condensing, which would affect the ink transfer effect of the ink transfer roller 4.

[0038] like Figure 1 , Figure 5 and Figure 7 As shown, the ink delivery mechanism includes a connecting frame 5 installed on the ink fountain trough 1, the connecting frame 5 communicating with the ink fountain trough 1, a recovery frame 6 installed on the connecting frame 5, the recovery frame 6 communicating with the connecting frame 5, a discharge frame 7 provided on the recovery frame 6, the recovery frame 6 extending from one side of the discharge frame 7, the discharge frame 7 being installed on the recovery frame 6 by multiple bolts, a filter frame 8 installed on the connecting frame 5, a feed pump 9 installed on the connecting frame 5, the inlet of the feed pump 9 communicating with the filter frame 8, a feed pipe 10 installed on the outlet of the feed pump 9, the feed pipe 10 being constructed of a retractable flexible hose, a connecting pipe 11 installed at the other end of the feed pipe 10, the connecting pipe 11 being connected to the left protective cover 203, and multiple inkjet nozzles 12 installed on the connecting pipe 11.

[0039] like Figure 1 and Figure 2As shown, the lifting assembly includes a mounting plate 20 mounted on a mounting frame 201. An adjusting screw 22 is rotatably mounted on the mounting plate 20, and an adjusting plate 21 is threaded onto the adjusting screw 22. The adjusting plate 21 is connected to the left protective cover 203. An adjusting motor 23 is mounted on the mounting plate 20, and the output shaft of the adjusting motor 23 is connected to one end of the adjusting screw 22. Two limit rods are mounted on the top of the mounting plate 20. Both limit rods pass through the adjusting plate 21 and are slidably connected to the adjusting plate 21. A top plate is mounted on the top of the two limit rods, and the adjusting screw 22 is rotatably connected to the top plate.

[0040] like Figure 9 As shown, an ink discharge frame 18 is installed on the ink fountain trough 1. The ink discharge frame 18 is connected to the ink fountain trough 1. An ink discharge pipe 19 is installed on the ink discharge frame 18. A valve is installed on the ink discharge pipe 19. Through the arrangement of the ink discharge frame 18 and the ink discharge pipe 19, the ink in the ink fountain trough 1 can be discharged when there is too much ink.

[0041] In this embodiment, during use, ink is supplied to the ink fountain 1 through the ink inlet pipe 3. The feed pump 9 is started to spray the ink in the ink fountain 1 onto the surface of the ink transfer roller 4 through the feed pipe 10, connecting pipe 11 and multiple inkjet nozzles 12. Then, the adjusting motor 23 is started to drive the adjusting screw 22 to rotate, adjusting the height of the left protective cover 203 and the right protective cover 204, indirectly adjusting the distance between the smear plate 13 and the surface of the ink transfer roller 4. During the rotation of the ink transfer roller 4, the thickness of the ink on the surface of the ink transfer roller 4 can be adjusted by the smear plate 13, and at the same time, the ink on the surface of the ink transfer roller 4 can be made more uniform, ensuring the ink transfer effect of the ink transfer roller 4.

[0042] Before the ink transfer roller 4 stops working, it needs to be rotated in the reverse direction. The scraper 17 can scrape off all the ink on the surface of the ink transfer roller 4 located between the left protective cover 203 and the right protective cover 204. Then, the adjusting motor 23 can be started to drive the left protective cover 203 and the right protective cover 204 to descend and contact the surface of the ink transfer roller 4. This will form a relatively closed space at the top of the ink fountain trough 1, reducing the contact between the ink and the external environment, and also reducing the evaporation of the ink.

[0043] Example 2

[0044] like Figure 1As shown, the environmentally friendly paper product printing equipment proposed in this invention, compared with Embodiment 1, further includes an ink agitation mechanism installed on the ink fountain trough 1 and connected to the left protective cover 203 and the right protective cover 204, which is driven by a lifting component to agitate the ink. The ink agitation mechanism includes a transmission rod 29 installed on the left protective cover 203 and the right protective cover 204, and the transmission rod 29 is raised and lowered by the left protective cover 203 and the right protective cover 204. A connecting cylinder 24 is installed on the transmission rod 29, and a telescopic rod 25 is slidably installed on the connecting cylinder 24. A telescopic spring 26 is installed inside the connecting cylinder 24, and one end of the telescopic spring 26 is connected to the telescopic rod 25. A cleaning plate 28 is installed on the end of the telescopic rod 25 away from the connecting cylinder 24. An agitation rod 27 is installed on the connecting cylinder 24. The cleaning plate 28 is composed of multiple cleaning plates and multiple connecting plates arranged at equal intervals. The multiple connecting plates are respectively installed on the outer wall of the multiple cleaning plates that are close to each other. The top of the multiple cleaning plates is set as an inclined surface, and the cleaning plates are in contact with the inner wall of the ink fountain trough 1.

[0045] In this embodiment, before the ink transfer roller 4 starts working, the adjusting motor 23 can be started to drive the adjusting screw 22 to rotate. Under the action of the adjusting plate 21, the left protective cover 203 and the right protective cover 204 are driven to repeatedly rise and fall. In this way, under the action of the transmission rod 29, the cleaning plate 28 and the stirring rod 27 can be driven to move up and down. The cleaning plate 28 can scrape off the ink adhering to the inner wall of the ink fountain 1, and the stirring rod 27 can stir the ink in the ink fountain 1, so that the ink is more uniform and provides more uniform ink for subsequent printing, indirectly improving the printing effect.

[0046] Example 3

[0047] The above-described method for using an environmentally friendly paper product printing equipment includes the following steps:

[0048] S1. The prepared ink is delivered into the ink fountain 1 through the ink inlet pipe 3, and the valve on the ink outlet pipe 19 is opened. The ink capacity in the ink fountain 1 is controlled by the ink outlet frame 18 and the ink outlet pipe 19.

[0049] S2. Start the feed pump 9 and spray ink onto the surface of the ink transfer roller 4 through the feed pipe 10, connecting pipe 11 and multiple inkjet nozzles 12. The ink transfer roller 4 rotates to deliver the ink to the printing roller for printing.

[0050] S3. Start the adjusting motor 23 to drive the adjusting screw 22 to rotate, which in turn drives the adjusting protective cover assembly to rise and fall, thereby adjusting the distance between the smear plate 13 and the surface of the ink transfer roller 4 to ensure the uniformity of ink on the surface of the ink transfer roller 4.

[0051] S4. When the ink transfer roller 4 is stopped, the adjusting motor 23 is started to drive the adjusting screw 22 to rotate, which in turn drives the left protective cover 203 and the right protective cover 204 to descend and contact the surface of the ink transfer roller 4. Then, a relatively enclosed space is formed above the ink fountain trough 1 through the protective cover assembly.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An environmentally friendly paper product printing equipment, characterized in that, The utility model relates to a kind of ink fountain groove, which includes: A protective cover assembly is arranged on the ink fountain groove (1) and is composed of a mounting frame (201), an extension frame (202), a left protective cover (203), a right protective cover (204) and two baffles (205); A wiping assembly is arranged on the protective cover assembly and is used to adjust the thickness of ink on the surface of the ink transfer roller (4); A lifting assembly is arranged on the mounting frame (201) and is used to adjust the distance between the left protective cover (203) and the right protective cover (204) and the surface of the ink transfer roller (4) to achieve the lifting of the upper part of the ink fountain groove (1); An ink transmission mechanism is arranged on the ink fountain groove (1) and is used to transmit ink to the surface of the ink transfer roller (4); An ink stirring mechanism is arranged on the ink fountain groove (1) and is connected with the left protective cover (203) and the right protective cover (204) and is driven by the lifting assembly to stir the ink. The lifting assembly includes a mounting plate (20) mounted on the mounting frame (201), an adjusting screw (22) rotatably mounted on the mounting plate (20), an adjusting plate (21) threadedly mounted on the adjusting screw (22), the adjusting plate (21) connected with the left protective cover (203), an adjusting motor (23) mounted on the mounting plate (20), and an output shaft of the adjusting motor (23) connected with one end of the adjusting screw (22). The ink stirring mechanism includes a transmission rod (29) mounted on the left protective cover (203) and the right protective cover (204) and lifted by the left protective cover (203) and the right protective cover (204), a connecting cylinder (24) mounted on the transmission rod (29), an extension rod (25) slidably mounted in the connecting cylinder (24), an extension spring (26) arranged in the connecting cylinder (24), one end of the extension spring (26) connected with the extension rod (25), a cleaning plate (28) mounted on the end of the extension rod (25) away from the connecting cylinder (24), and a stirring rod (27) mounted on the connecting cylinder (24). The cleaning plate (28) is composed of a plurality of cleaning plates arranged at equal intervals and a plurality of connecting plates, the plurality of connecting plates are respectively mounted on the outer walls of the cleaning plates on the side close to each other, the top of each cleaning plate is arranged as an inclined surface, and the cleaning plate is in contact with the inner wall of the ink fountain groove (1).

2. The environment-friendly paper product printing device according to claim 1, characterized in that, The wiping assembly is composed of a wiping plate (13) arranged on the left protective cover (203) and a scraping plate (17) arranged on the right protective cover (204), the side of the wiping plate (13) close to the ink transfer roller (4) is arranged as an inclined surface, the top of the scraping plate (17) is arranged as an inclined surface, the side of the scraping plate (17) close to the ink transfer roller (4) is arranged as a curved surface, and the curved surface is in contact with the surface of the ink transfer roller (4).

3. The environment-friendly paper product printing device according to claim 1, characterized in that, The ink conveying mechanism comprises a connecting frame (5) installed on the ink duct slot (1), the connecting frame (5) is communicated with the ink duct slot (1), a recovery frame (6) is installed on the connecting frame (5), the recovery frame (6) is communicated with the connecting frame (5), a discharge frame (7) is arranged on the recovery frame (6), a filter frame (8) is installed on the connecting frame (5), a conveying pump (9) is installed on the connecting frame (5), the inlet of the conveying pump (9) is communicated with the filter frame (8), a conveying pipe (10) is installed on the outlet of the conveying pump (9), the other end of the conveying pipe (10) is installed with a connecting pipe (11), the connecting pipe (11) is connected with the left protective cover (203), a plurality of ink jet nozzles (12) are installed on the connecting pipe (11).

4. The environment-friendly paper product printing device according to claim 1, characterized in that, The extending frame (202) is made of a frame-shaped silica gel cloth.

5. The environment-friendly paper product printing device according to claim 1, characterized in that, An ink discharge frame (18) is installed on the ink duct slot (1), the ink discharge frame (18) is communicated with the ink duct slot (1), an ink discharge pipe (19) is installed on the ink discharge frame (18), a valve is arranged on the ink discharge pipe (19).

6. The environment-friendly paper product printing apparatus according to claim 1, wherein The left protective cover (203) and the right protective cover (204) are both arranged in an arc shape, and the side of the left protective cover (203) and the right protective cover (204) close to each other is an arc surface, which is matched with the surface of the ink conveying roller (4).

7. A method of using the environment-friendly paper product printing apparatus according to claim 1, characterized by, The method comprises the following steps: S1, delivering the prepared ink into the ink duct slot (1); S2, conveying the ink to the surface of the ink conveying roller (4) through the ink conveying mechanism, and rotating the ink conveying roller (4) to deliver the ink to the printing roller for printing; S3, adjusting the height of the protective cover assembly through the lifting mechanism, and then adjusting the distance between the scraping assembly and the surface of the ink conveying roller (4), so as to ensure the uniformity of the ink on the surface of the ink conveying roller (4); S4, when the ink conveying roller (4) is not in use, the left protective cover (203) and the right protective cover (204) are lowered and contacted with the surface of the ink conveying roller (4) through the lifting mechanism, so as to form a relatively closed space above the ink duct slot (1).

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