Printing cylinder mechanism of offset press

Abstract

The invention discloses a printing cylinder mechanism of an offset press, and belongs to the technical field of offset presses. Comprising supporting plates, a blanket cylinder and a cleaning device, the two supporting plates are oppositely arranged, the blanket cylinder and the cleaning device are arranged between the two supporting plates respectively, the cleaning device is arranged on the front side of the blanket cylinder, and the two ends of the cleaning device are hinged to the corresponding supporting plates respectively. The cleaning device can rotate along the hinged position so as to be close to and fixed to the surface of the blanket cylinder or away from and fixed to the surface of the blanket cylinder. The cleaning device comprises a scraping plate and a brush roller, when the cleaning device is rotated to be close to the surface of the blanket cylinder and is fixed, the blanket cylinder is rotated, and the scraping plate and the brush roller clean the surface of the blanket cylinder in sequence; the cleaning device is additionally arranged to clean the blanket cylinder, so that impurities adhered to the surface of the blanket cylinder can be cleaned and brushed away, the cleanliness of the surface of the blanket cylinder is guaranteed, meanwhile, the flatness of the surface of the blanket cylinder can be guaranteed, the color purity and the color uniformity are guaranteed, and the printing quality is improved.

Description

Technical Field

[0001] The invention relates to a printing cylinder mechanism of an offset printing press, belonging to the technical field of offset printing presses. Background Art

[0002] Offset printing presses have been widely used in my country and have become the mainstream of my country's printing industry. During printing, offset printing presses first transfer the printed image from the printing plate to the rubber cylinder, and then transfer it to the paper by the rubber cylinder, which can significantly improve the printing effect. The working state of the rubber cylinder, as the core of the transfer, determines the final printing effect.

[0003] The surface of the rubber cylinder is wrapped with a layer of rubber cloth. During the use of the rubber cloth, it is necessary to clean and maintain the rubber cloth frequently in order to extend its service life. During printing, especially when the quality of the printed paper is poor, due to physical adsorption, it is easy to form a layer of accumulation formed by paper surface particles and fibers and pigment particles in the ink on the surface adhesive layer of the rubber cloth, causing the printing pressure on the rubber cloth to increase and the damage to it to increase. In addition, the accumulation layer is mostly polar substances, which causes the local oleophilicity and hydrophilicity of the rubber cloth to change, making it difficult for the local small dots on the printing plate to be expressed on the paper through the rubber cloth, and the dot restoration effect is poor, resulting in local gelatinization of the printed product and the appearance of powdery fine dots, which seriously affects the printing quality and can only be reprinted when necessary. In order to prevent the accumulation of paper powder, ink, etc. on the rubber cloth, it is necessary to clean and maintain the rubber cloth every once in a while or when a certain number of prints (for example, about 5,000 sheets) is reached according to the quality of the paper, ink, etc. If the maintenance is not appropriate, the rubber cloth may be scrapped within half a year; if the maintenance is proper, the rubber cloth can even be used for two years. In addition, if the rubber roller is not cleaned when changing colors, it will affect the purity of the new ink. Therefore, the rubber roller should also be cleaned when changing colors.

[0004] When cleaning, the rubber cylinder can be removed or not, and the rubber cylinder can be directly moved or slowly rotated for cleaning; when cleaning manually, it is generally wiped with a water rag first, then with a gasoline rag, and finally with a clean rag. Manual cleaning is troublesome, inefficient, and has safety hazards. If you are not careful, it may cause additional damage to the rubber. Therefore, large printing plants now prefer to use more efficient automatic cleaning devices for rubber cloths. However, the price of automatic cleaning devices is very expensive, and the automatic cleaning cloth needs to be replaced when it is used up. Moreover, the automatic cleaning cloth on the automatic cleaning device is difficult to achieve a thorough cleaning effect for relatively small impurity particles. In actual application, the automatic cleaning device will continue to clean the cylinder as long as the offset printing machine is turned on due to its cleaning structure. When the cylinder is in use, due to its high surface working temperature, the ink on its surface liquefies during cleaning and adheres to its surface. When the cleaning structure is cleaning, it is very easy to form patterns, and it cannot be cleaned completely. In addition, the cleaning structure will also affect the excellence of the cylinder when cleaning while working, resulting in color difference or even color mixing. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the invention is to solve the problems that the existing rubber roller is difficult to clean and is not thorough, the matching automatic cleaning device is expensive and the automatic cleaning cloth needs to be replaced frequently, and the cleaning effect is poor.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the present invention provides a printing roller mechanism of an offset printing machine, comprising a support plate, a rubber roller and a cleaning device arranged on one side of the rubber roller, the two support plates are arranged opposite to each other, the rubber roller and the cleaning device are respectively arranged between the two support plates, the cleaning device is arranged on the front side of the rubber roller, the two ends of the cleaning device are respectively hinged to the corresponding support plates, the cleaning device can be rotated along the hinge to approach the surface of the rubber roller and fix it or move away from the surface of the rubber roller and fix it; the cleaning device comprises a scraper and a brush roller, when the cleaning device is rotated to approach the surface of the rubber roller and fix it, the rubber roller is rotated clockwise, the rubber roller drives the brush roller to rotate clockwise in the same direction, the scraper and the brush roller successively clean the surface of the rubber roller, and the brush roller is provided with a plurality of soft brushes.

[0009] Furthermore, the cleaning device also includes an assembly plate and a hinge column, the two assembly plates are arranged opposite to each other, the scraper and the brush roller are arranged between the two assembly plates, the hinge column is arranged on the outer side of the assembly plate, the hinge hole is arranged on the support plate, the hinge column is inserted into the hinge hole, and the cleaning device can rotate along the connection between the hinge column and the hinge hole, so that the scraper and the brush roller thereon are respectively close to the surface of the rubber roller and fixed or away from the surface of the rubber roller and fixed.

[0010] Furthermore, the cleaning device also includes a limiting shaft, which is arranged between the two assembly plates, and its two ends respectively penetrate and extend out of the corresponding assembly plates, and each of the support plates is provided with two limiting ear plates, and the limiting ear plates are provided with limiting grooves, and the hinge holes are strip holes. When the cleaning device rotates along the hinge to approach the surface of the rubber roller or move away from the surface of the rubber roller, the two ends of the limiting shaft are respectively placed in the limiting grooves of the corresponding limiting ear plates to achieve fixation.

[0011] Furthermore, two limit plates are arranged on the inner side of each assembly plate, one of which is provided with a locking bolt. The two ends of the scraper are respectively clamped between the two limit plates of the assembly plate and can slide along the gap between the two limit plates. The scraper is locked by the locking bolt on the limit plate.

[0012] Furthermore, when the cleaning device rotates along the hinge to approach or move away from the surface of the rubber cylinder, the scraper always maintains a state in which the end away from the rubber cylinder is tilted downward relative to the horizontal plane.

[0013] Furthermore, both ends of the brush roller respectively penetrate and extend out of the corresponding assembly plate, and the brush roller can rotate along the connection between it and the assembly plate, at least one end of the rubber roller is provided with a first transmission gear, and the corresponding support plate is provided with a second transmission gear, and at least one corresponding end of the brush roller is provided with a third transmission gear, when the cleaning device rotates along the hinge and approaches the surface of the rubber roller, the first transmission gear and the third transmission gear are respectively engaged with the second transmission gear, and when the cleaning device rotates along the hinge and away from the surface of the rubber roller, the third transmission gear is disengaged from the second transmission gear.

[0014] Furthermore, a soft-bristle brush is axially arranged on the brush roller, and a plurality of soft-bristle brushes are arranged in a circumferential array along the surface of the brush roller.

[0015] Furthermore, the cleaning device also includes a collecting trough with an upward notch, and the lower end of the scraper is located above the notch of the collecting trough. During the rotation of the brush roller, the soft brush thereon brushes over the groove edge of the collecting trough close to the brush roller.

[0016] Furthermore, a card slot is provided between the two assembly plates, and the collecting slot is clamped in the card slot.

[0017] Furthermore, dense comb teeth are arranged on the groove edge of at least one side of the collecting groove close to the brush roller.

[0018] (III) Beneficial effects

[0019] The above technical solution of the present invention has the following advantages:

[0020] The present invention provides a cleaning device so that the surface of the rubber cylinder can be cleaned conveniently, quickly and thoroughly. The cleaning device can be flexibly controlled and is not likely to cause additional damage to the rubber cloth. The structure is simple and the cost is controllable. The scraper and the soft brush cooperate to fully clean the rubber cylinder. The scraper and the soft brush cooperate with the collection tank and can be used for a long time, reducing the replacement frequency. It can also achieve a thorough cleaning effect for relatively small impurity particles. When the cleaning device of the present invention is actually used, the offset printing machine can be kept away from the rubber cylinder when it is turned on, so that it will not cause interference and will not affect the use of the cylinder. The cleaning structure will not affect the excellence of the cylinder, thereby ensuring the printing quality.

[0021] The present invention can control the distance between the scraper and the roller, and can adjust the pressure between the scraper and the roller. Increasing the pressure can increase the friction between the scraper and the roller, thereby improving the cleaning effect. The scraper is also more convenient to replace.

[0022] The present invention makes it easier for impurities on the surface of the drum to be cleaned by the cleaning brush, and the impurities washed off are collected through the collecting tank for convenient centralized treatment. The present invention has a safe and reliable structure, a long service life, is easy to use, convenient and fast, and has a good market prospect.

[0023] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the axonometric view of the present invention.

[0026] Figure 2 It is a schematic cross-sectional view of the cleaning device of the present invention rotating along the hinge to approach the rubber cylinder and be fixed.

[0027] Figure 3 This is a schematic cross-sectional view of the cleaning device of the present invention being rotated along the hinge to move away from the rubber cylinder and then fixed.

[0028] Figure 4 This is a schematic diagram of the present invention after hiding the cleaning device and the like.

[0029] Figure 5 It is a schematic diagram of the cleaning device of the present invention.

[0030] Figure 6 Schematic diagram of the collecting tank of the present invention.

[0031] In the figure: 1. support plate; 2. rubber roller; 3. cleaning device; 4. scraper; 5. brush roller; 6. soft brush; 7. assembly plate; 8. hinge column; 9. hinge hole; 10. limit shaft; 11. limit ear plate; 12. limit plate; 13. locking bolt; 14. first transmission gear; 15. second transmission gear; 16. third transmission gear; 17. collecting trough; 18. card slot; 19. comb teeth. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example 1

[0035] like Figure 1-Figure 3As shown, a printing cylinder mechanism of an offset printing press comprises a support plate 1, a rubber cylinder 2 and a cleaning device 3 arranged on one side of the rubber cylinder 2. Two support plates 1 are arranged opposite to each other, and the rubber cylinder 2 and the cleaning device 3 are arranged between the two support plates 1 respectively. The surface of the rubber cylinder 2 is cleaned by the cleaning device 3. The cleaning device 3 is arranged on the front side of the rubber cylinder 2, so that it can be operated to be close to or away from the rubber cylinder 2. Both ends of the cleaning device 3 are respectively hinged to the corresponding support plates 1. The cleaning device 3 can rotate along the hinge to approach the surface of the rubber cylinder 2 and fix it or move away from the surface of the rubber cylinder 2 and fix it. When it is necessary to clean the surface of the rubber cylinder 2, the cleaning device 3 is controlled to rotate along the hinge to approach the surface of the rubber cylinder 2 and fix it, and then the rubber cylinder 2 is started (inching or slowly rotating), so as to realize automatic cleaning of the rubber cylinder 2. During the cleaning process, a cleaning agent (water, gasoline or rubber cloth reducing agent, etc.) can also be sprayed to improve the cleaning effect. When the rubber cylinder 2 needs to be put into use, the cleaning device 3 is controlled to rotate along the hinge to move away from the surface of the rubber cylinder 2 and fix it to prevent interference with the printing operation.

[0036] The cleaning device 3 includes a scraper 4 and a brush roller 5. When the cleaning device 3 is rotated close to the surface of the rubber roller 2 and fixed, the rubber roller 2 is rotated clockwise, and the rubber roller 2 drives the brush roller 5 to rotate clockwise in the same direction. The scraper 4 and the brush roller 5 successively clean the surface of the rubber roller 2. The two-stage cleaning structure improves the cleaning effect. A plurality of soft brushes 6 are arranged on the brush roller 5. Compared with a rag, the soft brush 6 has a more comprehensive cleaning effect and can also achieve a more thorough cleaning effect for relatively small impurity particles. The soft brush 6 is easier to care for and clean, reducing the replacement frequency.

[0037] Example 2

[0038] This embodiment is based on the embodiment 1, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0039] like Figure 5 As shown, the cleaning device 3 also includes an assembly plate 7 and a hinge column 8. The two assembly plates 7 are arranged opposite to each other, and the scraper 4 and the brush roller 5 are arranged between the two assembly plates 7. The cleaning device 3 is designed into an integral structure through the two assembly plates 7, which is convenient for use. The hinge column 8 is arranged on the outer side of the assembly plate 7, and the support plate 1 is provided with a hinge hole 9. The hinge column 8 is inserted into the hinge hole 9. The cleaning device 3 can rotate along the connection between the hinge column 8 and the hinge hole 9, thereby realizing hinge connection (it can be understood that the two ends of the cleaning device 3 and the corresponding support plate 1 can also adopt other hinge connection methods), so that the scraper 4 and the brush roller 5 thereon are respectively close to the surface of the rubber roller 2 and fixed or away from the surface of the rubber roller 2 and fixed.

[0040] Example 3

[0041] This embodiment is based on the embodiment 2, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0042] The cleaning device 3 also includes a limiting shaft 10, which is arranged between the two assembly plates 7, and its two ends respectively penetrate and extend out of the corresponding assembly plates 7, and each of the support plates 1 is provided with two limiting ear plates 11, and the limiting ear plates 11 are provided with U-shaped limiting grooves, and the hinge hole 9 is a strip hole. When the cleaning device 3 rotates along the hinge to approach the surface of the rubber cylinder 2 or away from the surface of the rubber cylinder 2, the hinge column 8 slides in the hinge hole 9, and then the two ends of the limiting shaft 10 are respectively placed in the limiting grooves of the corresponding limiting ear plates 11 to fix the cleaning device 3. It can be understood that although the cleaning device 3 is not completely fixed, it is sufficient to clean the surface of the rubber cylinder 2. In addition, through the setting of the limiting shaft 10, it is convenient for the staff to hold and rotate the cleaning device 3, so as to switch its working state.

[0043] Example 4

[0044] This embodiment is based on the embodiment 3, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0045] In the offset printing press printing cylinder mechanism described in this embodiment, two limiting plates 12 are arranged inside each assembly plate 7 of the cleaning device 3, and a slide groove for allowing the scraper 4 to pass is formed between the two limiting plates 12. A locking bolt 13 is arranged on one of the limiting plates 12 (usually the limiting plate 12 located on the upper side is selected), and the locking bolt 13 passes through the limiting plate 12 and is threadedly connected thereto (usually a nut column can be arranged on the limiting plate 12 at the connection to strengthen the threaded connection structure), and the two ends of the scraper 4 are respectively clamped between the two limiting plates 12 of the assembly plate 7, and can slide along the gap between the two limiting plates 12, and the scraper 4 is locked by the locking bolt 13 on the limiting plate 12. When the cleaning device 3 rotates along the hinge to approach the surface of the rubber cylinder 2, the gap or contact pressure between the upper end of the scraper 4 and the outer surface of the rubber cylinder 2 can also be adjusted by the locking bolt 13, so as to obtain different cleaning effects, and the use is flexible. By providing the limiting plate 12 and the locking bolt 13 , the scraper 4 can be easily removed for cleaning, thereby facilitating maintenance.

[0046] Example 5

[0047] This embodiment is based on the embodiment 4, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0048] When the cleaning device 3 rotates along the hinge to approach or move away from the surface of the rubber cylinder 2, the scraper 4 always keeps the end away from the rubber cylinder 2 tilted downward relative to the horizontal plane, so that the scraped impurities are kept discharged from the rubber cylinder 2.

[0049] Example 6

[0050] This embodiment is based on the embodiment 5, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0051] like Figure 1-4 As shown, the offset printing press printing cylinder mechanism described in this embodiment has two ends of the brush roller 5 of the cleaning device 3 respectively passing through and extending out of the corresponding assembly plate 7, and the brush roller 5 can rotate along the connection between it and the assembly plate 7, at least one end of the rubber cylinder 2 is provided with a first transmission gear 14, and the corresponding support plate 1 is provided with a second transmission gear 15, and at least one corresponding end of the brush roller 5 is provided with a third transmission gear 16, when the cleaning device 3 rotates along the hinge to approach the surface of the rubber cylinder 2, the first transmission gear 14 and the third transmission gear 16 are respectively meshed with the second transmission gear 15, so that the rubber cylinder 2 rotates clockwise to drive the brush roller 5 to rotate clockwise to clean the surface of the rubber cylinder 2, and when the cleaning device 3 rotates along the hinge to away from the surface of the rubber cylinder 2, the third transmission gear 16 is disengaged from the second transmission gear 15.

[0052] Example 7

[0053] This embodiment is based on the embodiment 6, and further optimizes and refines the structure of the cleaning device 3, specifically:

[0054] The brush roller 5 is provided with a soft brush 6 in the axial direction, and a plurality of soft brushes 6 are arranged in an array along the circumferential direction of the surface of the brush roller 5, so as to achieve a better cleaning effect. In addition, the soft brush 6 can be connected to the brush roller 5 in a detachable manner, such as a screw connection or a clamping connection (which can be achieved by using existing technical means), so as to facilitate the replacement and maintenance of the soft brush 6.

[0055] In this embodiment, the cleaning device 3 further includes a collecting tank 17 with a notch upward. Figure 6 As shown, the lower end of the scraper 4 is located above the notch of the collecting groove 17 to collect the scraped impurities into the collecting groove 17. During the rotation of the brush roller 5, the soft brush 6 thereon brushes over the groove edge of the collecting groove 17 close to the brush roller 5, thereby shaking off the impurities on the soft brush 6 into the collecting groove 17, which has a certain cleaning effect on the soft brush 6, making the next cleaning operation more effective.

[0056] In this embodiment, a card slot 18 is provided between the two assembly plates 7, and the collecting slot 17 is stuck in the card slot 18, so that the collecting slot 17 can be quickly disassembled and assembled for cleaning.

[0057] In this embodiment, dense comb teeth 19 are provided on the groove edge of the collecting groove 17 at least on the side close to the brush roller 5, so that the impurities on the soft brush 6 can be better cleaned by the comb teeth 19.

[0058] When using the present invention, under normal circumstances, the cleaning device 3 is in a state of being away from the rubber cylinder 2, and the rubber cylinder 2 normally participates in the printing operation. When the rubber cylinder 2 needs to be cleaned, the staff manually turns the cleaning device 3 close to the rubber cylinder 2 and fixes it, and then moves it clockwise or slowly rotates the rubber cylinder 2 to perform the cleaning operation. After the cleaning is completed, the staff can reset the cleaning device 3.

[0059] It is to be understood that the present invention can also be used for cleaning the impression cylinder of an offset printing press.

[0060] The present invention can effectively remove impurities such as plant fibers and coating particles in the paper accumulated on the rubber layer of the rubber cylinder 2 of the offset printing machine after long-term operation, avoid color mixing, and have high scrubbing efficiency. In addition, the spacing between the scraper 4 and the cylinder is adjustable, and the pressure is also adjustable, so it is not easy to damage the rubber cylinder 2. The present invention can ensure the cleanliness and flatness of the surface of the rubber cylinder 2, and can ensure the color purity when the cylinder is color-printed, and the color printing pattern is continuous and the color is uniform, which improves the color printing quality and effect, and is conducive to ensuring the high-quality color printing use of the cylinder for a long time.

[0061] In addition, in the description of the invention, unless otherwise specified, the terms "multiple", "multiple roots", "multiple groups" are used to mean two or more than two, and "several", "several roots", "several groups" are used to mean one or more than one. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A printing cylinder mechanism of an offset printing press, comprising a support plate, a blanket cylinder and a cleaning device arranged on one side of the blanket cylinder, wherein two support plates are arranged opposite to each other, and the blanket cylinder and the cleaning device are arranged between the two support plates, respectively, and characterized in that: The cleaning device is arranged on the front side of the rubber cylinder, and both ends of the cleaning device are respectively hinged to the corresponding support plates, and the cleaning device can rotate along the hinge to approach the surface of the rubber cylinder and be fixed, or to move away from the surface of the rubber cylinder and be fixed; The cleaning device includes a scraper and a brush roller. When the cleaning device is rotated close to the surface of the rubber cylinder and fixed, the rubber cylinder is rotated clockwise, and the rubber cylinder drives the brush roller to rotate clockwise in the same direction. The scraper and the brush roller clean the surface of the rubber cylinder in turn, and the brush roller is provided with multiple soft brushes.

2. The printing cylinder mechanism of the offset printing press according to claim 1, characterized in that: The cleaning device also includes an assembly plate and a hinge column. The two assembly plates are arranged opposite to each other, and the scraper and the brush roller are arranged between the two assembly plates. The hinge column is arranged on the outer side of the assembly plate, and the hinge hole is arranged on the support plate. The hinge column is inserted into the hinge hole. The cleaning device can rotate along the connection between the hinge column and the hinge hole so that the scraper and the brush roller thereon are respectively close to the surface of the rubber roller and fixed or away from the surface of the rubber roller and fixed.

3. The printing cylinder mechanism of the offset printing press according to claim 2, characterized in that: The cleaning device also includes a limiting shaft, which is arranged between the two assembly plates, and its two ends respectively penetrate and extend out of the corresponding assembly plates, and two limiting ear plates are arranged on each of the support plates, and limiting grooves are arranged on the limiting ear plates. The hinge hole is a strip hole, and when the cleaning device rotates along the hinge to approach the surface of the rubber roller or move away from the surface of the rubber roller, the two ends of the limiting shaft are respectively placed in the limiting grooves of the corresponding limiting ear plates to achieve fixation.

4. The printing cylinder mechanism of the offset printing press according to claim 3, characterized in that: Two limit plates are arranged on the inner side of each assembly plate, one of which is provided with a locking bolt. The two ends of the scraper are respectively clamped between the two limit plates of the assembly plate and can slide along the gap between the two limit plates. The scraper is locked by the locking bolt on the limit plate.

5. The printing cylinder mechanism of the offset printing press according to claim 4, characterized in that: When the cleaning device rotates along the hinge to approach the surface of the rubber cylinder or to move away from the surface of the rubber cylinder, the scraper always keeps the end away from the rubber cylinder in a downwardly inclined state relative to the horizontal plane.

6. The printing cylinder mechanism of the offset printing press according to claim 5, characterized in that: The two ends of the brush roller respectively penetrate and extend out of the corresponding assembly plate, and the brush roller can rotate along the connection between it and the assembly plate, at least one end of the rubber roller is provided with a first transmission gear, and the corresponding support plate is provided with a second transmission gear, and at least one corresponding end of the brush roller is provided with a third transmission gear, when the cleaning device rotates along the hinge and approaches the surface of the rubber roller, the first transmission gear and the third transmission gear are respectively meshed with the second transmission gear, and when the cleaning device rotates along the hinge and away from the surface of the rubber roller, the third transmission gear is disengaged from the second transmission gear.

7. The printing cylinder mechanism of the offset printing press according to claim 6, characterized in that: A soft brush is axially arranged on the brush roller, and a plurality of soft brushes are arranged in an array along the circumferential direction of the brush roller surface.

8. The printing cylinder mechanism of the offset printing press according to claim 7, characterized in that: The cleaning device also includes a collecting groove with an upward notch, the lower end of the scraper is located above the notch of the collecting groove, and during the rotation of the brush roller, the soft brush on it brushes over the groove edge of the collecting groove close to the brush roller.

9. The printing cylinder mechanism of the offset printing press according to claim 8, characterized in that: A card slot is arranged between the two assembly plates, and the collecting slot is clamped in the card slot.

10. The printing cylinder mechanism of the offset printing press according to claim 9, characterized in that: The collecting groove is provided with dense comb teeth on at least one groove edge of the brush roller.

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