Pressure adjusting device of flat plate printing machine

Abstract

The utility model discloses a pressure regulating device of a flat plate printing machine, which particularly relates to the technical field of printing machines and comprises two positioning plates positioned on two sides, a plate cylinder, a blanket cylinder and a pressure cylinder, the plate cylinder, the blanket cylinder and the pressure cylinder are mounted between the two positioning plates, and two ends of the pressure cylinder are respectively connected with a connecting shaft. A connecting block is installed at the end, away from the pressure roller, of the connecting shaft, sliding plates connected with the connecting block in a clamped mode are installed on the outer walls of the positioning plates, the two sliding plates are arranged on the positioning plates on the same side to clamp the connecting block, and the connecting block slides between the sliding plates. According to the utility model, thrust is generated by magnetic force control, the pressure roller is driven to move, and the two ends of the pressure roller are limited in structures such as the sliding plate and the like and move at the same time, so that the printing pressure of the pressure roller is adjusted, the phenomenon of non-uniform printing pressure in the printing process can be effectively improved, the printing effect is ensured, and the printing quality of products is improved.

Description

Technical Field

[0001] This utility model relates to the field of printing press technology, and more specifically, to a pressure regulating device for a flatbed printing press. Background Technology

[0002] The printing pressure of a flatbed printing press is the foundation of the press design and the transfer of ink to the substrate surface. It is not only the fundamental guarantee for the printing process, but also largely determines the quality of the print.

[0003] During the printing process, the degree to which the printing pressure is adjusted and controlled directly determines the quality of image transfer and dot reproduction, and is crucial for the smooth transfer of ink from the printing plate to the substrate.

[0004] The roller section of a flatbed printing press, from top to bottom, consists of a plate cylinder, a rubber roller, and a pressure cylinder. Paper passes through these cylinders sequentially to complete the ink printing process. Due to vibrations and damage during operation, the printing pressure of the pressure cylinder constantly changes. Operators must continuously monitor the printing results and adjust the pressure accordingly. Even so, differences in printing quality between different print runs within the same batch are still very likely, especially with older machines or those lacking proper maintenance. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a pressure regulating device for a flatbed printing machine, including two positioning plates located on both sides and a printing plate cylinder, a rubber cylinder and a pressure cylinder installed between the two positioning plates. Each end of the pressure cylinder is connected to a connecting shaft, and a connecting block is installed at the end of the connecting shaft away from the pressure cylinder. A sliding plate for engaging the connecting block is installed on the outer wall of the positioning plate. On the same side of the positioning plate, the sliding plate is configured to clamp the connecting block, and the connecting block slides between the sliding plates.

[0006] An adjusting plate is also connected between the two positioning plates. The adjusting plate is located on one side of the pressure roller. The adjusting plate includes a fixed part and a movable part. The movable part is connected to the couplings at both ends of the pressure roller. The fixed part pushes the movable part to move back and forth by magnetic force.

[0007] In a preferred embodiment, grooves are provided on the surfaces of the sliding plates that are close to each other on the same side positioning plate, and a slider that matches the groove is fixedly installed on the outer wall of the connecting block. The extension direction of the sliding plate is consistent with the arrangement direction of the printing plate cylinder, rubber cylinder and pressure cylinder.

[0008] In a preferred embodiment, a first limiting strip and a second limiting strip are fixedly installed at both ends of the slide plate on the same side positioning plate. The second limiting strip is located at the end of the slide plate close to the adjusting plate, and a pressure spring is connected between the second limiting strip and the connecting block.

[0009] In a preferred embodiment, a first bearing is embedded in the middle of the connecting block, the end of the connecting shaft is inserted into the first bearing, a second bearing is sleeved on the outer wall of the connecting shaft, a first connecting rod is connected to the outside of the second bearing, and the first connecting rod extends toward the side of the adjusting plate.

[0010] A limiting collar is sleeved on the outside of the first connecting rod, and a second connecting rod connected to the second limiting strip is fixed on the outer wall of the limiting collar.

[0011] In a preferred embodiment, the movable part includes a movable plate fixed to the end of the first connecting rod, the movable plate being located on one side of the pressure roller, and a reinforcing rib being fixedly installed on the outer wall of the movable plate on the side away from the pressure roller, with a neodymium magnet block installed in the middle of the reinforcing rib.

[0012] In a preferred embodiment, the fixing part includes a fixing plate connected between two positioning plates, and an electromagnet is installed in the middle of the fixing plate, the electromagnet being located on one side of the neodymium magnet block.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This invention uses magnetic force control to generate thrust, which drives the pressure roller to move. It ensures that both ends of the pressure roller are limited within the structure such as the slide plate while moving, thereby realizing the adjustment of the printing pressure of the pressure roller. This can effectively improve the phenomenon of uneven printing pressure during the printing process, ensure printing effect, and improve the printing quality of the product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 For the present utility model Figure 1 Detailed structural diagram at point A in the middle;

[0017] Figure 3 This is a schematic diagram of the end portion of the pressure roller of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Positioning plate, 2. Printing cylinder, 3. Rubber cylinder, 4. Pressure cylinder, 5. Connecting shaft, 6. Connecting block, 7. Slide plate, 8. Slide groove, 9. Slider, 10. First limiting strip, 11. Second limiting strip, 12. Pressure spring, 13. First bearing, 14. Second bearing, 15. First connecting rod, 16. Limiting collar, 17. Second connecting rod, 18. Movable plate, 19. Reinforcing rib, 20. Neodymium magnet block, 21. Fixing plate, 22. Electromagnet. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figure 1-3 The pressure regulating device of the flatbed printing machine shown includes two positioning plates on both sides and a printing plate cylinder, a rubber cylinder and a pressure cylinder installed between the two positioning plates. Each end of the pressure cylinder is connected to a connecting shaft. A connecting block is installed at the end of the connecting shaft away from the pressure cylinder. A sliding plate for engaging the connecting block is installed on the outer wall of the positioning plate. On the same side of the positioning plate, the sliding plate is configured to clamp the connecting block, and the connecting block slides between the sliding plates.

[0021] An adjusting plate is also connected between the two positioning plates. The adjusting plate is located on one side of the pressure roller. The adjusting plate includes a fixed part and a movable part. The movable part is connected to the couplings at both ends of the pressure roller. The fixed part pushes the movable part to move back and forth by magnetic force.

[0022] Based on the above, during operation, the printed paper passes through the printing plate cylinder, rubber cylinder, and pressure cylinder in sequence to complete the ink printing. The outermost pressure cylinder is a movable structure on the positioning plate. Adjusting the plate can push the pressure cylinder to move along the extension direction of the slide plate, so that the pressure cylinder can fit tightly with the rubber cylinder. This prevents the pressure cylinder from being loosened due to vibration and printing pressure, which would reduce the printing pressure and affect the printing effect.

[0023] Slide grooves are provided on the surfaces of the slide plates that are close to each other on the same side positioning plate. A slider that matches the slide groove is fixedly installed on the outer wall of the connecting block. The extension direction of the slide plate is consistent with the arrangement direction of the printing plate cylinder, rubber cylinder and pressure cylinder.

[0024] A first limiting strip and a second limiting strip are fixedly installed at both ends of the slide plate on the same side positioning plate. The second limiting strip is located at the end of the slide plate close to the adjusting plate. A pressure spring is connected between the second limiting strip and the connecting block.

[0025] The connecting block has a first bearing embedded in its middle, the end of the connecting shaft is inserted into the first bearing, a second bearing is sleeved on the outer wall of the connecting shaft, and a first connecting rod is connected to the outside of the second bearing, with the first connecting rod extending toward the side of the adjusting plate.

[0026] Based on the above, the two ends of the pressure roller are connected to the first bearing of the connecting block, and the connecting block is locked in the slide groove of the slide plate by the slider. When the connecting block moves on the slider of the slide plate by the slider, it will drive the connecting shafts at both ends of the pressure roller to move, thereby causing the pressure roller between the two connecting shafts to move, that is, to change the distance and printing pressure between the pressure roller and the rubber roller, so as to ensure the printing effect.

[0027] The first limiting strip limits the movement of the connecting block in one direction, while the second limiting strip limits the movement in the other direction. The pressure spring between the second limiting strip and the connecting block can provide a certain limiting and buffering effect on the connecting block, making its movement more gradual and preventing sudden movement that could cause the pressure roller to move instantly and affect the printing effect.

[0028] A limiting collar is sleeved on the outside of the first connecting rod, and a second connecting rod connected to the second limiting strip is fixed on the outer wall of the limiting collar.

[0029] Based on the above, when the coupling shaft and the pressure roller move, the first connecting rod on the second bearing outside the coupling shaft will move along with the pressure roller. During the movement of the first connecting rod, the limiting sleeve is placed outside it to limit its movement.

[0030] The movable part includes a movable plate fixed to the end of the first connecting rod. The movable plate is located on one side of the pressure roller. A reinforcing rib is fixedly installed on the outer wall of the movable plate away from the pressure roller. A neodymium magnet is installed in the middle of the reinforcing rib.

[0031] The fixing part includes a fixing plate connected between two positioning plates, and an electromagnet is installed in the middle of the fixing plate, with the electromagnet located on one side of the neodymium magnet block.

[0032] Based on the above, the electromagnet is connected to a control switch. When it is necessary to control the printing pressure, the electromagnet is energized to generate a magnetic field opposite to that of the neodymium magnet, which pushes the neodymium magnet to move towards one side of the pressure roller, thereby driving the movable plate to move. The movable plate pushes the first connecting rod to move, which in turn pushes the connecting shaft and the connecting block to move between the slide plate and the slide groove, thereby realizing the adjustment of the printing pressure of the pressure roller.

[0033] Furthermore, the fixed plate provides an installation location for the electromagnet, while the movable plate is used to cooperate with the electromagnet and the neodymium magnet. When the two generate a repulsive force, the movable plate moves, thereby driving the first connecting rod, the connecting shaft, and the pressure roller to move between the two positioning plates. The reinforcing ribs ensure the strength of the movable plate, so that when it is subjected to the repulsive force of the neodymium magnet, it can effectively generate a thrust on the first connecting rod and the connecting shaft, thus pushing the pressure roller to move.

[0034] Based on the above, magnetic force is used to generate thrust, which drives the pressure roller to move. At the same time, the two ends of the pressure roller are limited within the structure such as the slide plate and move, so as to realize the printing pressure adjustment of the pressure roller. This can effectively improve the phenomenon of uneven printing pressure during the printing process, ensure the printing effect, and improve the printing quality of the product.

[0035] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A flat printing press pressure adjusting device comprising two positioning plates on both sides and a plate cylinder, a rubber cylinder and a pressure cylinder installed between the two positioning plates, characterized in that, Two ends of the pressure roller are respectively connected with a connecting shaft, the connecting shaft is provided with a connecting block at the end away from the pressure roller, a sliding plate is arranged on the outer wall of the positioning plate and is clamped with the connecting block, two sliding plates are arranged on the positioning plate on the same side and are used for clamping the connecting block, and the connecting block slides between the sliding plates. An adjusting plate member is further connected between the two positioning plates, the adjusting plate member is located on one side of the pressure roller, the adjusting plate member comprises a fixed part and a movable part, the movable part is connected with the connecting shaft at two ends of the pressure roller, and the fixed part drives the movable part to move back and forth through magnetic force.

2. A pressure regulating device for a flat bed press as defined in claim 1, wherein: The surfaces of the sliding plates on the same positioning plate which are close to each other are provided with sliding grooves, sliding blocks which are consistent with the sliding grooves are fixedly installed on the outer wall of the connecting block, and the extension direction of the sliding plate is consistent with the arrangement direction of the plate cylinder, the rubber roller and the pressure roller.

3. A flat bed press pressure regulating device as claimed in claim 2, wherein: First and second limiting strips are respectively fixedly installed at two ends of the sliding plate on the same positioning plate, the second limiting strip is located at one end of the sliding plate close to the adjusting plate member, and a pressure spring is connected between the second limiting strip and the connecting block.

4. A flat bed press pressure regulating device as claimed in claim 3, wherein: A first bearing is embedded in the middle of the connecting block, the end of the connecting shaft is inserted into the first bearing, a second bearing is sleeved on the outer wall of the connecting shaft, the outer side of the second bearing is connected with a first connecting rod, and the first connecting rod extends towards the side of the adjusting plate member; A limiting sleeve ring is sleeved on the outer part of the first connecting rod, and a second connecting rod connected with the second limiting strip is fixed on the outer wall of the limiting sleeve ring.

5. A flat bed press pressure regulating device as claimed in claim 4, wherein: The movable part comprises a movable plate fixed on the end of the first connecting rod, the movable plate is located on one side of the pressure roller, a reinforcing rib is fixedly installed on the outer wall of the side of the movable plate away from the pressure roller, and a neodymium magnet block is installed in the middle of the reinforcing rib.

6. A flat bed press pressure regulating device as claimed in claim 5, wherein: The fixed part comprises a fixed plate connected between the two positioning plates, and an electromagnet is installed in the middle of the fixed plate and located on one side of the neodymium magnet block.

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