Paper flattening mechanism on printing machine

Abstract

The paper flattening mechanism comprises a paper supporting plate, an air pipe, a connecting plate and an air inlet pipe, the air pipe is arranged in the paper supporting plate, the connecting plate is arranged to be of an arc-shaped structure, the arc-shaped face of the connecting plate corresponds to conveying paper on the paper supporting plate, and the air pipe, the connecting plate and the air inlet pipe are welded together to form a supporting face used for flattening the conveying paper. The supporting face is fixed to a machine frame of the printing machine through a support, an air hole is formed in the air pipe and corresponds to the arc-shaped face of the connecting plate, a negative pressure cavity is formed among the connecting plate, the air pipe and the paper supporting plate, the support comprises a first connecting frame and a second connecting frame, and the first connecting frame is welded and fixed to the connecting plate. Air is sucked through the air pump, negative pressure is formed between the flattening mechanism and the paper due to the air suction effect of the air pump when the paper passes through the flattening mechanism, the curled paper moves downwards along the air pipe and the connecting plate on the flattening mechanism under the effect of the negative pressure, and then the paper becomes flattened.

Description

Technical Field

[0001] The utility model relates to the technical field of paper flattening on printing presses, in particular to a paper flattening mechanism on a printing press. Background Art

[0002] At present, after printing is completed, the delivery teeth of a sheet-fed offset printing press hold the paper, and the paper is delivered by the paper support device. However, due to factors such as ink volume control, water balance, and paper tension adjustment during the printing process, the tail or edge of the paper often curls up. Curled paper is easily stained and deformed during transmission, resulting in a decline in the quality of printed products. In severe cases, it may even cause uneven delivery or waste printing.

[0003] Patent publication number CN103342249B discloses a "printing paper suction flattening device", which flattens the paper by using the suction force of the suction plate by arranging a suction plate and a suction fan group on the outside of the paper transfer roller. However, this structure relies on the conjugation of the curved surface of the paper transfer roller, has a limited suction area, has poor adaptability to papers of different thicknesses, and has a complex structure, which is not conducive to maintenance; Patent document CN114103429A discloses a "printing machine paper flattening mechanism", which achieves paper flattening by setting multiple nozzles to blow fan-shaped airflow along the axial direction of the impression cylinder, but this solution depends on the airflow direction and air pressure accuracy, and it is difficult to ensure the stability of the paper during high-speed movement, and there is a risk of paper deviation caused by airflow disturbance; Patent document CN219769395U proposes a "paper printing flattening mechanism", which flattens the paper by adjusting the height and applying pressure, but physical pressure has the risk of scratching the surface of the paper, and the adjustment is complex, which cannot meet the needs of high-speed printing; Similarly, Patent documents CN215883071U and CN202623506U have the problem that the flattening effect is greatly affected by wind pressure and paper structure, and there is instability.

[0004] In order to solve the above-mentioned deficiencies in the prior art, a paper flattening mechanism on a printing press is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a paper flattening mechanism on a printing machine. Air is sucked by an air pump. When the paper passes through the flattening mechanism, negative pressure is formed between the flattening mechanism and the paper due to the suction action of the air pump. The curled paper moves downward along the air duct and the connecting plate on the flattening mechanism under the action of the negative pressure, and then the paper becomes flat. The flattened paper is not easy to get dirty during the process of moving forward through the paper supporting device, and finally the paper is neatly and smoothly collected, achieving a good paper collection effect, which can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a paper flattening mechanism on a printing press, comprising a paper support board, an air duct, a connecting plate and an air inlet duct, the air duct is arranged in the paper support board, the connecting plate is arranged in an arc-shaped structure, the arc-shaped surface of the connecting plate corresponds to the transmission paper on the paper support board, the air duct, the connecting plate and the air inlet duct are welded together to form a supporting surface for flattening the transmission paper, the supporting surface is fixed to the frame of the printing press through a bracket, the air duct is provided with air holes, the air holes correspond to the arc-shaped surface of the connecting plate, and a negative pressure chamber is formed between the connecting plate, the air duct and the paper support board.

[0007] Furthermore, the bracket includes a connecting frame 1 and a connecting frame 2, the connecting frame 1 is welded and fixed to the connecting plate, a bending section is provided at one end of the connecting plate, the connecting frame 1 is fixedly connected to the connecting frame 2 by screws, and the connecting frame 2 is fixed to the frame of the printing press by screws.

[0008] Furthermore, the diameter of the air holes is 2 mm, and the air holes are arranged at equal intervals on the air duct.

[0009] Furthermore, a plug and a plug with a hole are respectively provided at both ends of the air duct. The plug serves to seal one end of the air duct, and the other end of the plug with a hole is connected to an air pipe joint. The air pipe joint is connected to the external main air circuit through the air pipe and the dust cleaning switch. The dust cleaning switch is used to control the opening and closing of the air pipe.

[0010] Furthermore, one end of the air inlet pipe is connected to the middle of the air duct, and the other end of the air inlet pipe is connected to the air pump.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. Through the multiple air holes set on the surface of the air duct, a uniform and stable negative pressure area is formed between the air duct and the paper, so that the curled part of the paper is quickly attached to the flattening component under the action of negative pressure, effectively flattening the curling caused by printing or paper characteristics. At the same time, the paper runs stably under the negative pressure adsorption of the flattening device, and is not easy to deviate and shake, avoiding scratches and dirt caused by curling, improving the cleanliness of the printed surface, and ensuring the consistency of printing quality.

[0013] 2. The dust-cleaning air pipe and the dust-cleaning switch realize the back-blowing function, which can timely remove the dust adsorbed in the air intake hole and the air duct, avoid the blockage of the air path, and ensure the continuous and stable operation of the negative pressure system. The mechanism has a simple structure, a wide adsorption area, uniform negative pressure, good flattening effect and automatic dust cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the utility model with an air pump structure;

[0016] Figure 3 This is a schematic diagram of the negative pressure chamber structure of the utility model.

[0017] In the figure: 1 air duct, 2 connecting plate, 3 air inlet duct, 4 paper support, 5 connecting frame 1, 6 connecting frame 2, 7 paper transmission, 8 plug, 9 air suction duct, 10 air pump, 11 plug with holes, 12 air pipe joint, 13 air pipe, 14 dust cleaning switch, 15 air hole, 16 negative pressure chamber. DETAILED DESCRIPTION

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do 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 should not be understood as a limitation on the present invention. Example

[0019] See also Figure 1-3 The utility model provides a technical solution: a paper flattening mechanism on a printing press, the paper flattening mechanism is installed at a position after the arc motion curve of the paper, including a supporting paper board 4, an air duct 1, a connecting plate 2 and an air inlet duct 3, a transmission paper 7 moving forward in the direction of the arrow is arranged above the supporting paper board 4, the air duct 1 is arranged in the supporting paper board 4, the supporting paper board 4 is reserved with a gap for paper flattening, the connecting plate 2 is arranged in an arc structure, the arc surface of the connecting plate 2 corresponds to the transmission paper 7 on the supporting paper board 4, the air duct 1 is welded with the connecting plate 2 and the air inlet duct 3 to form a support surface for flattening the transmission paper 7, and the support surface is supported by a support The frame is fixed on the frame of the printing press, one end of the air inlet pipe 3 is connected to the middle of the air duct 1, and the other end of the air inlet pipe 3 is connected to the air pump 10; the air duct 1 is provided with an air hole 15, and the air hole 15 corresponds to the arc surface of the connecting plate 2, and a negative pressure chamber 16 is formed between the connecting plate 2, the air duct 1 and the paper support board 4. The negative pressure chamber 16 can generate negative pressure, and the warped transmission paper 7 moves downward along the air duct 1 and the connecting plate 2 on the flattening mechanism under the action of the negative pressure, and then the paper becomes flat; the flattened paper is not easy to get dirty during the process of moving forward through the paper support device, and finally the paper is collected neatly and smoothly, achieving a good paper collection effect.

[0020] The bracket includes a connecting frame 1 5 and a connecting frame 2 6. The connecting frame 1 5 is welded and fixed to the connecting plate 2. A bending section is provided at one end of the connecting plate 2. This structure is beneficial to increasing the structural strength of the connecting plate 2. The connecting frame 1 5 is fixedly connected to the connecting frame 2 6 by screws, and the connecting frame 2 6 is fixed to the frame of the printing press by screws.

[0021] The diameter of the air holes 15 is 2 mm, and the air holes 15 are arranged at equal intervals on the air duct 1, providing uniform suction for the negative pressure.

[0022] A plug 8 and a plug with a hole 11 are respectively provided at both ends of the air duct 1. The plug 8 serves to block one end of the air duct 1. The other end of the plug with a hole 11 is connected to an air pipe joint 12. The air pipe joint 12 is connected to the external main air path through an air pipe 13 and a dust cleaning switch 14. The dust cleaning switch 14 is used to control the opening and closing of the air pipe 13. After working for a period of time, the dust in the air is sucked into the air duct 1 and the suction pipe 9 through the air hole 15, blocking the pipeline and affecting the suction effect. Therefore, after the flattening mechanism has worked for a period of time, it is necessary to start the dust cleaning switch 14 to suck out the dust in the air duct 1 to keep the air hole 15 and the air path unobstructed.

[0023] Working principle: The paper flattening mechanism is installed on the path after completing the arc motion, and mainly realizes the paper flattening function by means of negative pressure adsorption; when working, the transmission paper 7 moves forward along the paper support board 4; when the paper passes through the flattening mechanism, the air pump 10 draws air into the air duct 1 through the air inlet pipe 3, so that negative pressure is formed inside the air duct 1; the negative pressure cavity 16 formed between the air duct 1, the connecting plate 2 and the paper support board 4 generates uniform suction through multiple air holes 15 distributed on the surface of the air duct 1, and adsorbs the warped transmission paper 7 on the arc surface of the connecting plate 2 and the paper support board 4, and gradually flattens it.

[0024] The negative pressure adsorption effect effectively prevents the paper 7 from warping and undulating, ensures its stable transportation along the paper support 4, and avoids the paper 7 from getting dirty or deviating during the transportation process, thereby improving the neatness and stability of paper collection and ensuring printing quality.

[0025] To ensure long-term stable operation, the flattening mechanism is equipped with a dust cleaning system; one end of the air duct 1 is connected to the air pipe joint 12 through a perforated plug 11, and then connected to the external main air path through the air pipe 13 and the dust cleaning switch 14; when the air duct 1 and the suction pipe 9 inhale dust due to long-term operation, causing the air hole 15 to be blocked and affecting the suction effect, the dust cleaning switch 14 can be started to clear the dust accumulated inside the air duct 1 through reverse airflow, keep the air hole 15 unobstructed, and ensure the normal operation of the negative pressure system.

[0026] In addition, the flattening mechanism is installed on the printer frame through a combination of a connecting frame 1 5 and a connecting frame 2 6; the connecting frame 1 5 is fixed to the connecting plate 2 by welding, the connecting frame 1 5 and the connecting frame 2 6 are fixed with screws, and the connecting frame 2 6 is further fixed to the printer frame by screws; a bending section is provided at one end of the connecting plate 2, which effectively enhances the structural strength and improves the overall stability and durability.

[0027] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which are all within the scope of the present invention to be protected.

Claims

1. A paper flattening mechanism on a printing press, comprising a paper support plate (4), an air duct (1), a connecting plate (2) and an air inlet duct (3), characterized in that: The air duct (1) is arranged in a paper support plate (4), the connecting plate (2) is arranged in an arc-shaped structure, the arc-shaped surface of the connecting plate (2) corresponds to the transmission paper (7) on the paper support plate (4), the air duct (1) is welded together with the connecting plate (2) and the air inlet duct (3) to form a support surface for flattening the transmission paper (7), the support surface is fixed to the frame of the printing press through a bracket, the air duct (1) is provided with an air hole (15), the air hole (15) corresponds to the arc-shaped surface of the connecting plate (2), and a negative pressure chamber (16) is formed between the connecting plate (2), the air duct (1) and the paper support plate (4).

2. A paper flattening mechanism on a printing press according to claim 1, characterized in that: The bracket comprises a connecting frame 1 (5) and a connecting frame 2 (6), wherein the connecting frame 1 (5) is fixed to the connecting plate (2) by welding, one end of the connecting plate (2) is provided with a bending section, the connecting frame 1 (5) is fixedly connected to the connecting frame 2 (6) by screws, and the connecting frame 2 (6) is fixed to the frame of the printing press by screws.

3. The paper flattening mechanism on a printing press according to claim 1, characterized in that: The diameter of the air holes (15) is 2 mm, and the air holes (15) are arranged at equal intervals on the air duct (1).

4. The paper flattening mechanism on a printing press according to claim 1, characterized in that: A plug (8) and a plug with a hole (11) are respectively provided at both ends of the air duct (1); the other end of the plug with a hole (11) is connected to an air pipe joint (12); the air pipe joint (12) is connected to an external main air path via an air pipe (13) and a dust cleaning switch (14); the dust cleaning switch (14) is used to control the opening and closing of the air pipe (13).

5. The paper flattening mechanism on a printing press according to claim 1, characterized in that: One end of the air inlet pipe (3) is connected to the middle of the air duct (1), and the other end of the air inlet pipe (3) is connected to the air pump (10).

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