A printing press suitable for use in an aqueous ink printing process

Abstract

A printing machine suitable for water-based ink printing process, comprising a paper guide roller and an ink applying member, the ink applying member comprising an ink applying box, an ink applying roller, a partition frame, the partition frame having an ink injection hole in the middle, the upper end of the ink injection hole movably connected with a movable rod used for plugging the ink injection hole, the lower end of the ink injection hole hermetically connected with an ink injection cylinder, the ink injection cylinder rotatably connected with a control unit, the control unit comprising a main rod rotatably connected in the ink injection cylinder, a cam arranged on the main rod and used for lifting the movable rod in a rotary manner, and a replenishment hole arranged on the end side wall of the ink injection cylinder. By arranging the control unit in the ink injection cylinder, the present application can realize constant speed and frequency replenishment, and the frequency and speed of replenishment can be accurately adjusted, ensuring the constant total amount of ink, and in the replenishment process, the flow of ink can be promoted, the deposition of ink can be avoided, and the uniformity of the ink can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of paper printing equipment technology, and specifically relates to a printing machine suitable for water-based ink printing processes. Background Technology

[0002] Solvent-based printing inks are widely used in offset printing and packaging industries due to their excellent chemical properties and good chemical resistance. However, these inks typically use a chemical reagent containing aromatic compounds as a printing solvent. Because solvent-based inks require large amounts of organic solvents, they release significant amounts of volatile organic compounds (VOCs) into the air, causing serious environmental pollution. In contrast, water-based inks, as an environmentally friendly ink, can be called "green" inks. Their biggest difference from traditional solvent-based inks is that they use water as a solvent, significantly reducing the use of organic solvents. This not only reduces the generation and emission of VOCs but also does not pose a threat to human health. Compared to traditional solvent-based inks, water-based inks have advantages such as safety, environmental friendliness, high efficiency, non-toxicity, and superior quality.

[0003] In existing decorative paper printing using water-based inks, the paper is typically conveyed between two rollers. One roller has an ink-coated brush roller on its surface, which evenly applies the ink to the roller and then indirectly onto the decorative paper. The brush roller is usually directly immersed in an ink storage container, with a liquid level sensor monitoring the liquid level. Ink is added before the liquid level drops below the brush roller. Before this point, the ink flow is relatively slow, and prolonged relative stillness allows particulate matter to gradually settle, leading to a relative dilution of the upper layer of ink. Furthermore, as the liquid level decreases, the amount of ink immersed in the brush roller decreases, and the amount of ink adhering to it also changes, affecting the printing quality.

[0004] Authorization document CN116714363B discloses a feeding device for water-based ink printing on decorative paper, including a drive housing and an ink tank, with a guide roller for guiding decorative paper rotatably connected between the drive housing and the ink tank. This feeding device for water-based ink printing on decorative paper, by providing overflow holes in the ink tank of the ink coating roller, ensures that the ink coating roller is always immersed in ink at a stable level, facilitating better and more uniform ink adhesion for printing operations and guaranteeing stable printing quality.

[0005] However, the above-mentioned equipment still has the following defects: the ink in the ink tank of this device is replenished by the buoyancy of the ink or the impact force generated when replenishing ink to push the round rod upward. The replenishment time and amount of ink are difficult to control in this ink replenishment method. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a printing press suitable for water-based ink printing processes. By setting a control unit inside the ink injection cylinder, it can achieve constant speed and frequency ink replenishment, and the frequency and speed of ink replenishment can be precisely adjusted, ensuring a constant total amount of ink. At the same time, the ink replenishment process can also promote ink flow, prevent ink sedimentation, and ensure ink uniformity.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A printing press suitable for water-based ink printing processes includes a paper guide roller and an inking component. The inking component includes an inking box, an inking roller rotatably disposed within the inking box and in contact with the lower surface of the paper guide roller, and a separator frame disposed within the inking box and located below the inking roller. The separator frame has an ink injection hole in the middle. An movable rod for sealing the ink injection hole is movably connected to the upper end of the ink injection hole. An ink injection cylinder is sealed to the lower end of the ink injection hole. A control unit is rotatably connected inside the ink injection cylinder. The control unit includes a main rod rotatably connected inside the ink injection cylinder, a cam disposed on the main rod and lifting the movable rod by rotation, and an ink replenishment hole disposed on the side wall of the end of the ink injection cylinder.

[0009] As a further preferred embodiment of the present invention, the control unit further includes a brush structure disposed on the end of the cam near the inner wall of the ink injection cylinder.

[0010] As a further preferred embodiment of the present invention, the brush structure includes a groove disposed on the end of the cam that contacts the movable rod, a movable plate slidably connected in the groove, a fixed plate disposed on the surface of the movable plate away from the bottom surface of the groove, and brush bristles disposed on the surface of the fixed plate.

[0011] As a further preferred embodiment of the present invention, the brush structure further includes an adsorption layer disposed on the inner wall of the lower end of the ink filling cylinder, and a first magnetic block disposed in the fixing plate and attracting the adsorption layer.

[0012] As a further preferred embodiment of the present invention, the bristle structure further includes a limiting protrusion disposed at the groove opening.

[0013] As a further preferred embodiment of the present invention, the bristle structure further includes an anti-collision layer disposed on the bottom surface of the groove.

[0014] As a further preferred embodiment of the present invention, the control unit further includes a transmission structure disposed on the outer wall of the ink tank and connected to the main rod; the transmission structure includes a rotating shaft fixedly connected to the main rod.

[0015] As a further preferred embodiment of the present invention, the control unit further includes a transmission chain disposed on the rotating shaft and connected to the roller shaft of the paper guide roller or the ink coating roller.

[0016] As a further preferred embodiment of the present invention, the control unit further includes two limiting protrusions disposed on the outer wall of the rotating shaft and parallel to each other to limit the position of the transmission chain.

[0017] As a further preferred embodiment of the present invention, the control unit further includes a switching structure disposed within the end of the rotating shaft; the switching structure includes an opening disposed on the end of the rotating shaft and extending to the limiting protrusion, a connecting hole disposed between the two limiting protrusions and communicating with the opening, a top ball slidably connected within the connecting hole, a top rod disposed on the top ball and passing through the opening, and a sliding block slidably connected within the opening and causing the top ball to push up the transmission chain in a direction perpendicular to the axis of the rotating shaft by acting on the top rod.

[0018] As a further preferred embodiment of the present invention, the partition frame has a V-shaped or U-shaped cross-section, and an overflow hole is provided at the higher part of the partition frame.

[0019] As a further preferred embodiment of the present invention, the connecting hole is a strip-shaped hole, and the switching structure further includes a control rod disposed at one end of the sliding block and extending to the outside of the opening, and a mounting block disposed at the other end of the sliding block and hinged to the end of the push rod, wherein the other end of the push rod is hinged to the lower surface of the top ball.

[0020] As a further preferred embodiment of the present invention, the switching structure further includes a limiting plate disposed at the connection between the opening and the connecting hole and having a strip-shaped hole through which the top rod passes.

[0021] As a further preferred embodiment of the present invention, the switching structure further includes a second magnetic block disposed on the bottom surface of the opening, and a third magnetic block disposed on one end of the sliding block near the mounting block and attracting the second magnetic block.

[0022] As a further preferred embodiment of the present invention, the switching structure further includes a cylinder disposed on the end of the rotating shaft, a connecting thread disposed on the outer wall of the cylinder, a cover screwed to the connecting thread, a plug-in post disposed in the middle of the cover, and a socket disposed on the end of the control rod for inserting the plug-in post. Attached Figure Description

[0023] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Appendix Figure 2 This is a partial structural diagram of the control unit of the present invention.

[0025] Appendix Figure 3 This is a schematic diagram of the position and structure of the control unit of the present invention from a side view angle.

[0026] Appendix Figure 4 This is a partial structural diagram of the brush bristle structure of the present invention.

[0027] Appendix Figure 5 This is a schematic diagram of one possible switching structure of the present invention.

[0028] Appendix Figure 6 This is a schematic diagram of another structure of the switching structure of the present invention.

[0029] Figure description: 1. Paper guide roller; 2. Ink coating component;

[0030] 21. Ink coating box, 22. Ink coating roller, 23. Divider frame, 24. Ink filling hole, 25. Movable rod, 26. Ink filling cylinder, 27. Overflow hole;

[0031] Main rod 301, cam 302, ink filling hole 303, brush bristle structure 304, transmission structure 305;

[0032] Groove 304a, movable plate 304b, fixed plate 304c, bristles 304d, adsorption layer 304e, first magnetic block 304f, limiting protrusion 304g, anti-collision layer 304h.

[0033] Rotating shaft 305a, transmission chain 305b, convex ring 305c;

[0034] Opening 306a, connecting hole 306b, top ball 306c, top rod 306d, sliding block 306e, control rod 306f, mounting block 306g, limiting plate 306h, second magnetic block 306i, third magnetic block 306j, cylinder 306k, cover 306l, insertion post 306m, insertion hole 306n. Detailed Implementation

[0035] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to 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 invention.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Example 1

[0038] This embodiment provides a printing machine suitable for water-based ink printing processes, including a paper guide roller 1 and an inking component 2. The inking component 2 includes an inking box 21, an inking roller 22 rotatably disposed in the inking box 21 and in contact with the lower surface of the paper guide roller 1, and a separator frame 23 disposed in the inking box 21 and located below the inking roller 22. The separator frame 23 has an ink injection hole 24 in the middle. An movable rod 25 for sealing the ink injection hole 24 is movably connected to the upper end of the ink injection hole 24. An ink injection cylinder 26 is sealed to the lower end of the ink injection hole 24. A control unit is rotatably connected inside the ink injection cylinder 26. The control unit includes a main rod 301 rotatably connected inside the ink injection cylinder 26, a cam 302 disposed on the main rod 301 and lifting the movable rod 25 by rotation, and an ink replenishment hole 303 disposed on the end side wall of the ink injection cylinder 26.

[0039] As a further preferred embodiment, the separator 23 has a V-shaped or U-shaped cross-section. The ink injection hole 24 is located at the lowest point of the separator 23 and is strip-shaped to ensure that the ink throughput meets the standard. More preferably, the length of the ink injection hole 24 is equivalent to the length of the ink injection cylinder 26. An overflow hole 27 is provided at the higher part of the separator 23 to ensure that the total amount of ink in the upper space of the separator 23 remains constant, thereby ensuring that the ink coating roller 22 is always immersed in ink at a stable height, resulting in good uniformity and stability of ink application on the paper guide roller 1, and ensuring stable printing quality. The ink replenishment hole 203 is connected to an external ink storage tank (existing technology, so it will not be described in detail) to ensure that the total amount of ink in the ink injection cylinder 26 remains full and stable. The overflow hole 27 can be connected to the ink storage tank or directly connected to the ink replenishment hole 303 through a delivery pipe to realize the recycling of ink.

[0040] As a further preferred embodiment, the control unit further includes a transmission structure 305 disposed on the outer wall of the ink tank 21 and connected to the main rod 301; the transmission structure 305 includes a rotating shaft 305a fixedly connected to the main rod 301, and the transmission shaft 305a is directly connected to a motor to drive the rotating shaft 305a to rotate.

[0041] The main rod 301 is rotatably connected to the upper middle part of the ink filling cylinder 26. The number of cams 302 can be single or multiple, and all cams 302 are located directly below the ink filling hole 24. The cam 302 is preferably a disc-shaped cam. The movable rod 25 is the follower of the cam 302. The maximum stroke of the cam 302 is greater than the distance between the main rod 301 and the ink filling hole 24, ensuring that the cam 302 can move through the ink filling hole 24 to lift the movable rod 25, thus releasing the sealing effect of the movable rod 25 on the ink filling hole 24. During the return stroke of the cam 302, due to the special shape of the separator 23, the movable rod 25 can fall back to the ink filling hole 24 to re-seal it.

[0042] It is understandable that even if a small amount of ink passes through a gap between the movable rod 25 and the ink filling hole 24 after the rod falls back, the total amount of ink in the upper space of the separator 23 remains constant due to the presence of the overflow hole 27, so the impact is minimal. The rotating shaft 305a passes through the ink filling cylinder 26 and is directly connected to the main rod 301. The rotating shaft 305a and the ink filling cylinder 26 are sealed together to prevent ink leakage. The structure for achieving a sealed connection is common knowledge to those skilled in the art, so it will not be described in detail in this embodiment.

[0043] As a further preferred embodiment, in order to ensure that the movable rod 25 can effectively block the ink injection hole 24, the exterior of the movable rod 25 can be provided with a material that helps to block the gap, such as a rubber layer, and guide plates are provided at both ends of the ink injection hole 24 facing the movable rod 25; in order to prevent the cam 302 from wearing with the ink injection hole 24 during rotation, ball bearings that reduce friction are provided on the side wall of the ink injection hole 24.

[0044] The working principle of the printing press provided in this embodiment is as follows: The movable rod 25 overcomes the buoyancy and is positioned above the ink injection hole 24, blocking the ink injection hole 24. At this time, the ink between the ink injection cylinder 26 and the separator 23 does not flow. The external motor is started to drive the rotating shaft 305a to rotate. The rotating shaft 305a drives the cam 302 on the main rod 301 to rotate. During the rotation, the cam 302 repeatedly pushes up the movable rod 25. When the movable rod 25 is pushed away from the ink injection hole 24, ink enters the upper end of the separator 23 to achieve ink replenishment. The overflow hole 27 ensures that the total amount of ink at the upper end of the separator 23 is constant. After the movable rod 25 falls into the ink injection hole 24, the ink does not flow. The ink replenishment speed can be adjusted by controlling the rotation speed of the rotating shaft 205a.

[0045] The advantages of the printing press provided in this embodiment include: by setting a control unit inside the ink injection cylinder, this device can achieve constant speed and frequency ink replenishment, and the frequency and speed of ink replenishment can be precisely adjusted to ensure that the ink roller is always immersed in ink at a stable height, thereby ensuring the stability of printing.

[0046] This device incorporates a control unit within the ink filling cylinder. During the ink replenishment process, the cam agitates the ink within the cylinder, ensuring its uniformity. Simultaneously, the repeated lifting and lowering of the movable rod promotes ink flow within the upper space of the separator, preventing ink sedimentation and further guaranteeing ink uniformity.

[0047] Example 2

[0048] This embodiment optimizes the structure of the control unit based on Embodiment 1, as follows:

[0049] The control unit also includes a brush structure 304 disposed on the end of the cam 302 near the inner wall of the ink cartridge 26. The brush structure 304 can scrape the inner wall when the long end of the cam 302 contacts the inner wall of the ink cartridge 26, thereby removing accumulated sediment and promoting uniform ink dispersion.

[0050] If the bristle structure 304 is fixedly installed on the outer wall of the cam 302, the following problems exist: First, the bristle structure 304 cannot cover the inner wall of the ink cartridge 26 that needs to be swept; Second, when the long end of the cam 302 moves to the upper end and enters the ink filling hole 204, the ink filling hole 204 and the movable rod 205 will press down on the bristles, making the bristles easy to fall over, thus weakening the sweeping effect.

[0051] Therefore, this embodiment further optimizes the bristle structure 304, as follows:

[0052] The bristle structure 304 includes a groove 304a disposed on the end of the cam 302 that contacts the movable rod 25, a movable plate 304b slidably connected in the groove 304a, a fixed plate 304c disposed on the surface of the movable plate 304b away from the bottom surface of the groove 304a, and bristles 304d disposed on the surface of the fixed plate 304c.

[0053] The advantages of this design are as follows: First, the movable plate 304b can be set with a long strip of similar length to the ink cartridge 26 to install the brush bristles 304d, thereby covering the inner wall of the ink cartridge 26 that needs to be cleaned; Second, when the long end of the cam 302 moves to the upper end, due to gravity, the movable plate 304b will drive the brush bristles 304d back to the bottom of the groove 304a. The height of the brush bristles 304d is lower than the outer surface of the cam 302, thereby protecting the brush bristles 304d.

[0054] As a further preferred embodiment, the bristle structure 304 further includes an adsorption layer 304e disposed on the inner wall of the lower end of the ink cartridge 26, and a first magnetic block 304f disposed within the fixed plate 304c and attracting the adsorption layer 304e. This arrangement ensures that the bristles 304d will not be retracted due to a reaction force when sweeping the inner wall of the ink cartridge 26 under the combined action of gravity and magnetic attraction of the movable plate 304b, thus guaranteeing the sweeping effect.

[0055] As a further preferred embodiment, the bristle structure 304 further includes a limiting protrusion 304g disposed at the opening of the groove 304a to prevent the movable plate 304b from falling out of the groove 304a.

[0056] As a further preferred embodiment, the bristle structure 304 further includes an anti-collision layer 304h disposed on the bottom surface of the groove 304a to prevent the moving part 304b from falling back into the groove 304a and causing excessive impact on the groove.

[0057] Example 3

[0058] The difference between this embodiment and Embodiment 1 is that the control unit further includes a transmission chain 305b mounted on the rotating shaft 305a and connected to the shaft of the paper guide roller 1 or the inking roller 22. This arrangement reduces the use of external motors and lowers economic costs. In this case, the inking process and printing process occur simultaneously, meeting the needs of practical applications.

[0059] Example 4

[0060] This embodiment optimizes the structure based on embodiment 3, aiming to overcome the problems in embodiment 3 where ink replenishment could not be performed independently and the frequency could not be controlled. The specific structure is as follows:

[0061] The control unit further includes two limiting protrusions 305c, which are disposed on the outer wall of the rotating shaft 305a and are parallel to each other to limit the position of the transmission chain 305b, and a switching structure disposed in the end of the rotating shaft 305a. The switching structure includes an opening 306a disposed in the end of the rotating shaft 305a and extending to the limiting protrusions 305c, a connecting hole 306b disposed between the two limiting protrusions 305c and communicating with the opening 306a, a top ball 306c slidably connected in the connecting hole 306b, a top rod 306d disposed on the top ball 306c and inserted into the opening 306a, and a sliding block 306e slidably connected in the opening 306a and causing the top ball 306c to push up the transmission chain 305b in a direction perpendicular to the axis of the rotating shaft 305a by acting on the top rod 306d.

[0062] As a further preferred embodiment, the connecting hole 306b is a strip-shaped hole, and the switching structure further includes a control rod 306f disposed at one end of the sliding block 306e and extending to the outside of the opening 306a, and a mounting block 306g disposed at the other end of the sliding block 306e and hinged to the end of the top rod 306d. The other end of the top rod 306d is hinged to the lower surface of the top ball 306c.

[0063] As a further preferred embodiment, the switching structure further includes a limiting plate 306h disposed at the connection between the opening 306a and the connecting hole 306b, and having a strip-shaped hole through which the top rod 306d passes.

[0064] It is worth noting that the transmission chain 305b is an elastic band, which ensures that the transmission chain 305b can be stretched open and can also re-adhere to the outer wall of the rotating shaft 305a when the top ball 306c is not working. The number of top balls 306c is at least two, and in this embodiment, three are preferred. The number of top rods 306d corresponds to the number of top balls 306c, and both ends of the top rods 306d are hinged. All top rods 306d are connected to the same sliding block 306e. The advantage of this arrangement is that when one sliding block 306e is driven to move in the opening 306a, all top rods 306d can move synchronously, thereby causing all top balls 306c to be pushed out or fall back synchronously in a direction perpendicular to the axis of the rotating shaft 305a, so as to ensure that the tension and contraction effects of the transmission chain 305b are the same at all working positions.

[0065] The working principle of the control unit provided in this embodiment is as follows: Pushing the sliding block 306e to move deeper into the opening 306a, the sliding block 306e pushes all the push rods 306d to move and rotate, thereby causing all the top balls 306c to be pushed out synchronously in a direction perpendicular to the axis of the rotating shaft 305a. The transmission chain 305b disengages from the rotating shaft 305a, keeping the position of the sliding block 306e unchanged. At this time, independent ink replenishment can be achieved by driving the rotating shaft 305a to rotate alone. The rotation frequency can also be adjusted at will. When independent ink replenishment is not required, the sliding block 306e is pulled to move towards the opening in the opening 306a. The push rods 306d drive the top balls 306c to retract into the connecting hole 306b. The transmission chain 305b re-adheres to the rotating shaft 305a and drives the rotating shaft 305a to rotate.

[0066] Example 5

[0067] This embodiment is an optimized version of embodiment 4, as detailed below:

[0068] The switching structure also includes a second magnetic block 306i disposed on the bottom surface of the opening 306a, and a third magnetic block 306j disposed on the end of the sliding block 306e near the mounting block 306g, which attracts the second magnetic block 306i. This arrangement avoids the need for manual maintenance of the sliding block 306e's position, as the attraction between the second magnetic block 306i and the third magnetic block 306j ensures that the protrusion height of the top ball 306c remains constant. It should be noted that when pulling the sliding block 306e towards the opening in the opening 306a, additional resistance to the attraction is required.

[0069] Example 6

[0070] This embodiment is an optimized version of embodiment 5, as detailed below:

[0071] The switching structure also includes a cylindrical body 306k located at the end of the rotating shaft 305a, a connecting thread on the outer wall of the cylindrical body 306k, a cover 306l screwed to the connecting thread, a plug-in post 306m located in the middle of the cover 306l, and a socket 306n located at the end of the control rod 306f for inserting the plug-in post 306m. This arrangement ensures that after the sliding block 306e is pulled to move from the opening 306a to the opening, the thread between the cover 306l and the cylindrical body 306k locks the plug-in post 306m into the socket 306n, thereby keeping the sliding block 306e at the opening of the opening 306a and ensuring that the top ball 306c is always retracted within the connecting hole 306b.

[0072] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A printing press suitable for water-based ink printing process, comprising a paper guide roller (1) and an ink coating component (2), wherein the ink coating component (2) comprises an ink coating box (21), an ink coating roller (22) rotatably disposed within the ink coating box (21) and in contact with the lower end surface of the paper guide roller (1), and a separator frame (23) disposed within the ink coating box (21) and located below the ink coating roller (22), wherein the separator frame (23) has an ink injection hole (24) in the middle, an movable rod (25) for sealing the ink injection hole (24) is movably connected to the upper end of the ink injection hole (24), and an ink injection cylinder (26) is sealed to the lower end of the ink injection hole (24), characterized in that, The ink filling cylinder (26) is rotatably connected to a control unit, which includes a main rod (301) rotatably connected to the ink filling cylinder (26), a cam (302) disposed on the main rod (301) and lifting the movable rod (25) by rotation, and an ink filling hole (303) disposed on the end side wall of the ink filling cylinder (26); the control unit also includes a brush structure (304) disposed on the end of the cam (302) near the inner wall of the ink filling cylinder (26); the brush structure (304) includes a groove (304a) disposed on the end of the cam (302) that contacts the movable rod (25), a movable plate (304b) slidably connected in the groove (304a), a fixed plate (304c) disposed on the surface of the movable plate (304b) away from the bottom surface of the groove (304a), and brush bristles (304d) disposed on the surface of the fixed plate (304c).

2. A printing machine suitable for water-based ink printing processes according to claim 1, characterized in that, The brush structure (304) further includes an adsorption layer (304e) disposed on the inner wall of the lower end of the ink filling cylinder (26), and a first magnetic block (304f) disposed in the fixing plate (304c) and attracted to the adsorption layer (304e).

3. A printing machine suitable for water-based ink printing processes according to claim 1, characterized in that, The bristle structure (304) also includes a limiting protrusion (304g) disposed at the opening of the groove (304a).

4. A printing machine suitable for water-based ink printing processes according to claim 1, characterized in that, The bristle structure (304) also includes an anti-collision layer (304h) disposed on the bottom surface of the groove (304a).

5. A printing machine suitable for water-based ink printing processes according to claim 1, characterized in that, The control unit also includes a transmission structure (305) disposed on the outer wall of the ink tank (21) and connected to the main rod (301); the transmission structure (305) includes a rotating shaft (305a) fixedly connected to the main rod (301) and a transmission chain (305b) disposed on the rotating shaft (305a) and connected to the roller shaft of the paper guide roller (1) or the ink coating roller (22).

6. A printing machine suitable for water-based ink printing processes according to claim 5, characterized in that, The control unit also includes two limiting protrusions (305c) disposed on the outer wall of the rotating shaft (305a) and parallel to each other to limit the position of the transmission chain (305b).

7. A printing machine suitable for water-based ink printing processes according to claim 6, characterized in that, The control unit further includes a switching structure disposed within the end of the rotating shaft (305a); the switching structure includes an opening (306a) disposed on the end of the rotating shaft (305a) and extending to the limiting protrusion (305c), a connecting hole (306b) disposed between the two limiting protrusions (305c) and communicating with the opening (306a), a top ball (306c) slidably connected within the connecting hole (306b), a top rod (306d) disposed on the top ball (306c) and passing through the opening (306a), and a sliding block (306e) slidably connected within the opening (306a) and causing the top ball (306c) to axially push up the transmission chain (305b) by acting on the top rod (306d).

8. A printing machine suitable for water-based ink printing processes according to claim 1, characterized in that, The partition (23) has a V-shaped or U-shaped cross-section, and an overflow hole (27) is provided at the higher part of the partition (23).

Images