Protective oil coating device for paper printing and printing press

Abstract

The present invention discloses a protective oil coating device and a printing press for paper printing, and relates to the technical field of printing equipment. The present invention includes two symmetrically arranged side plates, between which are installed a front coating mechanism and a back coating mechanism of identical structure, including a coating roller, a fixed connecting rod, an oil tank, a coating roller mounting seat, and a drive motor; both ends of the coating roller are rotatably mounted on the coating roller mounting seat; the oil tank is arranged below the coating roller, the peripheral side of the coating roller extends into the oil tank, and the drive motor cooperates with the coating roller in transmission. The present invention arranges a front coating mechanism and a back coating mechanism, the coating roller extends into the oil tank, and the drive motor cooperates with the coating roller in transmission to drive the coating roller to rotate in the oil tank, so that the protective oil in the oil tank is evenly attached to the surface of the coating roller, and then the coating roller evenly coats the protective oil to the front and back of the paper, thereby sealing the ink on the surface of the paper, and eliminating the phenomenon of pressing and rubbing that often occurs during printing.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment, and in particular relates to a protective oil coating device for paper printing and a printing press. Background Art

[0002] A printing press is a machine that prints text and images. Modern printing presses generally consist of mechanisms such as plate loading, inking, embossing, and paper feeding. Its operating principle is as follows: the text and image to be printed are first made into a printing plate and mounted on the printing press. Ink is then applied manually or by the printing machine to the areas of the plate where the text and image are located. The ink is then transferred directly or indirectly to paper or other substrates (such as paper or textiles), producing a printed product identical to the printing plate.

[0003] During the operation of rotary printing presses, due to the high speed of the machine, ink on printed sheets passing through the guide rollers is not yet dry, which can easily cause smearing. As the next printed sheet is stacked on top, ink from the previous sheet may partially transfer to the next, resulting in printing problems such as smearing, smearing, and sticking. Smearing not only leaves ink stains on the printed surface but also causes a mottled appearance of the image and text, seriously affecting product quality and even causing the entire batch of printed products to be scrapped. Smearing is particularly prone to problems when printing dark tones in color products or when printing large areas with spot colors, due to the thick ink layer. Furthermore, relative motion between the paper and the machine during the printing process can also cause smearing on the printed surface. This can damage the surface layer or the printed image, reducing product quality. In severe cases, it can even lead to product scrapping and reprinting, resulting in significant economic losses. Furthermore, the frequent adjustments and replacement of related parts when problems occur consume a significant amount of workshop staff time, affecting production efficiency and product quality. Summary of the Invention

[0004] The present invention aims to provide a protective oil coating device for paper printing. By providing a front coating mechanism and a back coating mechanism, protective oil is first attached to a coating roller, which then evenly applies the protective oil to both sides of the paper. This seals the ink on the paper surface, preventing printing problems such as smudging, rubbing, and sticking caused by wet ink. This addresses the problem of smudging in existing printing processes, particularly when thick ink layers are present, which can lead to product scrapping and reprinting, resulting in serious economic losses and impacting workshop production efficiency and product quality. Another object of the present invention is to provide a printing press that addresses the smudging issue that is common in existing printing presses.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention relates to a protective oil coating device and a printing press for paper printing, comprising two symmetrically arranged side panels, with a front coating mechanism and a back coating mechanism installed between the two side panels. The front coating mechanism comprises a coating roller, a fixed connecting rod, an oil tank, a coating roller mounting seat, and a drive motor; the two ends of the fixed connecting rod are fixedly connected to the side panels to form an overall frame. The two ends of the coating roller are rotatably mounted on the coating roller mounting seat. The two ends of the oil tank are fixedly connected to the coating roller mounting seat and are arranged below the coating roller. The circumference of the coating roller extends into the oil tank. The drive motor cooperates with the coating roller transmission to drive the coating roller to rotate, and the protective oil in the oil tank is evenly adhered to the circumference of the coating roller. The back coating mechanism and the front coating mechanism adopt the same structure.

[0007] As a preferred technical solution of the present invention, a paper guide roller is rotatably installed between the two side plates, and the paper is transmitted through the paper guide roller, the front coating mechanism and the back coating mechanism.

[0008] As a preferred technical solution of the present invention, the front coating mechanism also includes a swing arm and a cylinder for moving the coating roller into contact with or away from the paper. The upper end of the swing arm is rotatably engaged with the circumference of the connecting rod, the lower end of the swing arm is hingedly connected to one end of the coating roller mounting seat, and the other end of the coating roller mounting seat is mounted with a slide rod. The inner wall of the side panel is fixed with two parallel guide groove blocks, forming a guide groove between the two guide groove blocks, and the slide rod can slide along the guide groove. One end of the cylinder is hingedly connected to the swing arm, and the other end of the cylinder is hingedly connected to a support block fixed to the inner wall of the side panel. The cylinder extends and retracts, driving the swing arm to rotate around the connecting rod, which in turn drives the slide rod to slide along the guide groove, achieving forward and backward movement of the coating roller.

[0009] As a preferred technical solution of the present invention, the drive motor is fixedly mounted on the side panel, and the drive motor and the coating roller are coordinated through a chain and sprocket transmission. The connection between the chain and the sprocket has a certain flexibility. Even if the coating roller slides a short distance, it will not affect the transmission stability of the chain and the sprocket.

[0010] As a preferred technical solution of the present invention, the front coating mechanism also includes a limiting bolt for adjusting the attachment area between the coating roller and the paper. A limiting block is fixed to the inner wall of the side panel. The limiting bolt is threadedly engaged with the limiting block. One end of the limiting bolt abuts against the end of the sliding rod provided on the coating roller mounting seat.

[0011] As a preferred technical solution of the present invention, the oil tank is provided with an oil inlet, the oil inlet is connected to the oil tank via a pipeline, and an oil pump is installed on the pipeline to pump the protective oil in the oil tank into the oil tank.

[0012] As a preferred technical solution of the present invention, the oil tank is further provided with an oil outlet, which is also connected to the oil tank via a pipe. The oil outlet is elevated above the bottom surface of the oil tank and lower than the sidewalls of the oil tank to maintain the liquid level in the oil tank flush with the upper end of the outlet. This not only maintains a stable oil level in the oil tank, but also allows the oil to flow, preventing it from accumulating and forming dirt in the oil tank, which is difficult to clean.

[0013] As a preferred technical solution of the present invention, the protective oil is silicone oil.

[0014] As a preferred technical solution of the present invention, wiring grooves for air and circuit wiring are also installed on the coating roller mounting seats on both sides to avoid exposure of the wiring and ensure the neatness of the coating device.

[0015] A printing press includes the protective oil coating device. The side plates are fixedly connected to the main body of the printing press so that the front coating mechanism and the back coating mechanism are installed at a position higher than the oil tank.

[0016] The present invention has the following beneficial effects:

[0017] The present invention provides a front coating mechanism and a back coating mechanism. The front coating mechanism and the back coating mechanism adopt the same structure, including a coating roller, an oil tank, a coating roller mounting seat and a drive motor. The coating roller extends into the oil tank. The drive motor cooperates with the coating roller to drive the coating roller to rotate in the oil tank, and the protective silicone oil in the oil tank is evenly attached to the surface of the coating roller. The coating roller then evenly coats the protective oil to the front and back of the paper, thereby sealing the ink on the surface of the paper, eliminating the pressing and rubbing phenomena that often occur during printing, improving printing quality, and increasing production efficiency.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work.

[0020] Figure 1 This is a schematic structural diagram of the protective oil coating device of the present invention installed on a printing press;

[0021] Figure 2 It is a structural schematic diagram of the protective oil coating device;

[0022] Figure 3 A schematic structural diagram of the protective oil coating device from another perspective;

[0023] Figure 4 It is a structural diagram of the front coating mechanism;

[0024] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0025] Figure 6 Side view of the front coating mechanism;

[0026] Figure 7 It is a structural schematic diagram of another embodiment of the front coating mechanism;

[0027] Figure 8 It is a structural diagram of the oil tank;

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 100-printing machine, 200-protective oil coating device, 1-front coating mechanism, 101-coating roller, 102-fixed connecting rod, 103-oil tank, 1031-oil inlet, 1032-oil outlet, 104-swing arm, 105-coating roller mounting seat, 1051-slide rod, 106-drive motor, 107-cylinder, 108-guide groove block, 109-limit bolt, 1091-limit block, 1010-wiring groove, 2-back coating mechanism, 3-side panel, 4-paper guide roller, 5-oil tank, 6-oil pump. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] See also Figure 1As shown, this embodiment provides a printing press, particularly a rotary printing press for paper printing. Since the printing press 100 operates at high speed, the ink on the printed sheet passing through the guide roller is not yet dry and is prone to staining. Therefore, this embodiment adds a protective oil coating device 200 to the existing rotary printing press. After the paper is printed, protective oil is applied to the surface of the paper to seal the ink on the paper surface and prevent it from smearing. Silicone oil is preferably used as the protective oil, which has stable chemical properties, good insulation and hydrophobic properties, and can improve the durability of the paper. In addition, silicone oil has a low surface tension, allowing it to be evenly applied to the surface of the paper.

[0033] See also Figure 2 and Figure 3 As shown, the protective oil coating device 200 includes two symmetrically arranged side panels 3, between which a front coating mechanism 1 and a back coating mechanism 2 are installed. The two have the same structure and are used to coat silicone oil on the front and back of the paper respectively.

[0034] See also Figure 4-Figure 6 As shown, taking the front coating mechanism 1 as an example, the front coating mechanism 1 includes a coating roller 101, a fixed connecting rod 102, an oil tank 103, a swing arm 104, a coating roller mounting base 105, a drive motor 106, and a cylinder 107. The ends of the fixed connecting rod 102 are fixedly connected to the side panels 3 to form an integral frame. The ends of the coating roller 101 are rotatably mounted on the coating roller mounting base 105 via bearing blocks. The upper end of the swing arm 104 is rotated with the circumferential side of the fixed connecting rod 102, and the lower end of the swing arm 104 is hinged to one end of the coating roller mounting seat 105. The other end of the coating roller mounting seat 105 is installed with a slide bar 1051. Two parallel guide groove blocks 108 are fixed to the inner wall of the side plate 3, and a guide groove is formed between the two guide groove blocks 108. One end of the cylinder 107 is hinged to the swing arm 104, and the other end of the cylinder 107 is hinged to a support block fixed to the inner wall of the side plate 3. The cylinder 107 extends and retracts, driving the swing arm 104 to rotate around the fixed connecting rod 102, and then driving the slide bar 1051 to slide along the guide groove, realizing the forward and backward movement of the coating roller 101.

[0035] The front coating mechanism 1 also includes a limiting bolt 109 for adjusting the attachment area between the coating roller 101 and the paper. A limiting block 1091 is fixed to the inner wall of the side panel 3. The limiting bolt 109 is threadedly engaged with the limiting block 1091. The limiting bolt 109 and the coating roller mounting seat 105 are provided with an end of a sliding rod 1051 that abuts against each other.

[0036] As a preferred embodiment, Figure 7 As shown, wiring grooves 1010 are also installed on the coating roller mounting seats 105 on both sides. The air circuit and the circuit pass through the wiring grooves 1010 to facilitate equipment wiring and prevent the circuits from being wrapped around the roller shaft.

[0037] The ends of the oil tank 103 are fixedly connected to the coating roller mounting bracket 105 and are positioned below the coating roller 101. The circumference of the coating roller 101 extends into the oil tank 103, which is filled with silicone oil, and the circumference of the coating roller 101 can be immersed in the silicone oil. The drive motor 106 is fixedly mounted on the side plate 3. The drive motor 106 and the coating roller 101 cooperate via a chain and sprocket drive to drive the coating roller 101 to rotate, evenly adhering the silicone oil in the oil tank 103 to the circumference of the coating roller 101.

[0038] See also Figure 1 and Figure 8 As shown, the side panel 3 is fixedly connected to the main body of the printing press 100, allowing the front coating mechanism 1 and the back coating mechanism 2 to be mounted at a higher position. The oil tank 103 is provided with an oil inlet 1031, which is connected to the oil tank 5 via a pipeline. An oil pump 6 is installed on the pipeline to pump the silicone oil in the oil tank 5 into the oil tank 103. The oil tank 5 and oil pump 6 are placed on the ground, with the oil tank 103 at a higher height than the oil tank. The oil tank 103 is also provided with an oil outlet 1032, which is also connected to the oil tank 5 via a pipeline. The oil outlet 1032 is higher than the bottom surface of the oil groove 103 and lower than the side wall of the oil groove 103. The silicone oil is pumped into the oil groove 103 from the oil tank 5. After accumulating in the oil groove 103 to the height of the oil outlet 1032, it flows back to the oil tank 5 along the pipeline from the oil outlet 1032, thereby maintaining the stability of the liquid level in the oil groove 103 and always keeping the upper end of the oil outlet 1032 level.

[0039] See also Figure 1 and Figure 2 As shown, a paper guide roller 4 is rotatably mounted between the two side plates 3. During operation, after printing by the printing press 100, the paper passes through the paper guide roller 4, the front coating mechanism 1, and the back coating mechanism 2. For dark tones in color products and when printing large areas with spot colors, silicone oil is applied as a protective coating due to the thick ink layer. At this point, the cylinder 107 is activated, driving the coating roller 101 against the paper surface. Simultaneously, the drive motor 106 is activated, driving the coating roller 101 to rotate in sync with the paper's transport speed. During this process, the coating roller 101 evenly applies the silicone oil in the oil tank 103 to the front side of the paper. The back coating mechanism 2 operates on the same principle as the front coating mechanism 1, evenly applying silicone oil to the back side of the paper. During this process, the oil pump 6 pumps the silicone oil from the oil tank 5 into the oil tank 103, ensuring a stable oil level in the oil tank 103 and, therefore, a stable silicone oil application rate. For single-sided printing, only the front coating mechanism 1 or the back coating mechanism 2 can be activated. For monochrome products, such as pure text books and periodicals, the ink layer is thin and the ink dries easily, so there is no need to start the protective oil coating device 200. When the paper passes through the front coating mechanism 1 and the back coating mechanism 2, the cylinder 107 drives the coating roller 101 away from the paper surface.

[0040] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A protective oil coating device for paper printing, characterized in that: It comprises two symmetrically arranged side panels (3), with a front coating mechanism (1) and a back coating mechanism (2) installed between the two side panels (3); The front coating mechanism (1) comprises a coating roller (101), a fixed connecting rod (102), an oil tank (103), a coating roller mounting seat (105), and a drive motor (106); both ends of the fixed connecting rod (102) are fixedly connected to the side plates (3) to form an overall frame; Both ends of the coating roller (101) are rotatably mounted on a coating roller mounting seat (105); The two ends of the oil groove (103) are fixedly connected to the coating roller mounting seat (105) and are arranged below the coating roller (101); the peripheral side of the coating roller (101) extends into the oil groove (103); the driving motor (106) is in transmission cooperation with the coating roller (101) to drive the coating roller (101) to rotate, and the protective oil in the oil groove (103) is evenly adhered to the peripheral side of the coating roller (101); The back coating mechanism (2) and the front coating mechanism (1) adopt the same structure; The front coating mechanism (1) further comprises a swing arm (104) and a cylinder (107) for making the coating roller (101) close to or away from the paper, the upper end of the swing arm (104) is rotatably engaged with the circumference of the fixed connecting rod (102), the lower end of the swing arm (104) is hinged to one end of the coating roller mounting seat (105), the other end of the coating roller mounting seat (105) is mounted with a slide bar (1051), the inner wall of the side plate (3) is fixed with two parallel guide groove blocks (108), a guide groove is formed between the two guide groove blocks (108), and the slide bar (1051) can slide along the guide groove; One end of the cylinder (107) is hinged to the swing arm (104), and the other end of the cylinder (107) is hinged to a support block fixed to the inner wall of the side plate (3). The cylinder (107) extends and retracts, driving the swing arm (104) to rotate around the fixed connecting rod (102), thereby driving the slide rod (1051) to slide along the guide groove, thereby realizing the forward and backward movement of the coating roller (101); The front coating mechanism (1) further comprises a limiting bolt (109) for adjusting the area of ​​attachment between the coating roller (101) and the paper; a limiting block (1091) is fixed to the inner wall of the side plate (3); the limiting bolt (109) is threadedly engaged with the limiting block (1091); one end of the limiting bolt (109) abuts against the end of a sliding rod (1051) provided on the coating roller mounting seat (105).

2. A protective oil coating device for paper printing according to claim 1, characterized in that: A paper guide roller (4) is rotatably mounted between the two side plates (3), and the paper is transported through the paper guide roller (4), the front coating mechanism (1) and the back coating mechanism (2).

3. The protective oil coating device for paper printing according to claim 1, characterized in that: The drive motor (106) is fixedly mounted on the side plate (3), and the drive motor (106) and the coating roller (101) are coupled via a chain sprocket transmission.

4. A protective oil coating device for paper printing according to any one of claims 1 to 3, characterized in that: The oil tank (103) is provided with an oil inlet (1031), and the oil inlet (1031) is connected to the oil tank (5) via a pipeline. An oil pump (6) is installed on the pipeline to pump the protective oil in the oil tank (5) into the oil tank (103).

5. The protective oil coating device for paper printing according to claim 4, characterized in that: The oil tank (103) is also provided with an oil outlet (1032), and the oil outlet (1032) is also connected to the oil tank (5) through a pipeline; The oil outlet (1032) is higher than the bottom surface of the oil tank (103) and lower than the side wall of the oil tank (103), so as to maintain the liquid level in the oil tank (103) flush with the upper end of the oil outlet (1032).

6. The protective oil coating device for paper printing according to claim 5, characterized in that: The protective oil is silicone oil.

7. The protective oil coating device for paper printing according to claim 6, characterized in that: Wiring grooves (1010) for routing gas and circuit wiring are also installed on the coating roller mounting seats (105) on both sides.

8. A printing press, characterized in that: The protective oil coating device (200) comprises the protective oil coating device (200) according to any one of claims 1 to 7; the side plate (3) is fixedly connected to the body of the printing press (100) so as to install the front coating mechanism (1) and the back coating mechanism (2) at a position higher than the oil tank (5).

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