Fully servo driven flexographic printing press

Abstract

The present invention relates to the technical field of flexographic printing machines, mainly to a fully servo-driven flexographic printing machine, comprising two frame plates, a pressing roller rotatably mounted between the two frame plates, a printing plate roller mounted between the two frame plates, grooves being provided at both ends of the printing plate roller, cover plates being fixed at both ends of the two printing plate rollers, a driving shaft being fixed at the outer side of the cover plates, a mounting seat being mounted between the two frame plates and connected to the driving shaft; and a flexible printing plate sleeved on the outer side of the printing plate roller. The present invention improves the conventional docking mode between the flexible printing plate and the printing plate roller, designs a positioning strip on the flexible printing plate, cooperates with a tensioning unit to interact, realizes tensioning and positioning of the flexible printing plate, and cooperates with an adsorption unit designed in the printing plate roller to realize adsorption and positioning of the flexible printing plate. The tensioning and adsorption positioning cooperate with each other, thereby making the positioning of the flexible printing plate stable and not prone to deviation.

Description

Technical Field

[0001] The invention relates to the technical field of flexographic printing machines, in particular to a full servo-driven flexographic printing machine. Background Art

[0002] The working principle of the fully servo-driven flexographic printing press is similar to that of a general flexographic printing press, but it is more precise in terms of power transmission and control. It drives the printing roller, printing plate roller and other key components separately through servo motors.

[0003] At present, the flexographic printing machine mainly makes the flexible printing plate installed on the printing plate cylinder contact with the anilox roller, so that the raised part on the flexible printing plate absorbs the ink, and the printing material is closely attached to the flexible printing plate on the outside of the printing plate cylinder under the action of the impression roller, thus completing the printing process;

[0004] Existing flexible printing plates are usually fixed to the plate cylinder using double-sided tape, but during high-speed printing or long-term printing, the viscosity of the tape may be affected, causing the flexible plate to loosen and deviate, affecting the printing quality. Summary of the invention

[0005] The object of the present invention is to provide a fully servo-driven flexographic printing press to solve the problem in the above background technology that the flexible printing plate on the outer side of the existing printing plate cylinder is prone to deviation and loosening after being installed with double-sided adhesive.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fully servo-driven flexographic printing machine, comprising two frame plates, a pressing roller is rotatably installed between the two frame plates, and also comprises a printing plate cylinder installed between the two frame plates, grooves are provided at both ends of the printing plate cylinder, cover plates are fixed at both ends of the two printing plate cylinders, and a driving shaft is fixed on the outer side of the cover plate, and a mounting seat connected to the driving shaft is installed between the two frame plates; and a flexible printing plate sleeved on the outer side of the printing plate cylinder, insertion ports connected to the grooves are provided at both ends of the printing plate cylinder, and positioning strips adapted to the insertion ports are fixed at the bottom of both ends of the flexible printing plate, a tensioning unit for pulling and positioning the positioning strip is installed in the groove, and two mounting grooves are provided in the groove; and an adsorption unit installed in the mounting groove, adsorption holes are provided on the printing plate cylinder, and an air duct connected to the adsorption holes is also provided on the printing plate cylinder, and a vent connected to the air duct is provided in the mounting groove.

[0007] Preferably, the tensioning unit includes two rotating rods rotatably installed in the groove, the two rotating rods are rotatably docked with the inner wall of the groove through a bearing seat, and a driving motor is installed in the groove, the output end of the driving motor is fixed to the outer end of one of the rotating rods through a coupling, a tensioning cylinder is provided on the outer side of the rotating rod, and a disc spring is fixed between the rotating rod and the tensioning cylinder, and the positioning bar is pulled down by synchronously reversing the two tensioning cylinders, and gears meshing with each other are fixed on the outer sides of the two rotating rods.

[0008] Preferably, a receiving groove is provided on the outer side of the insertion port, and the depth of the receiving groove is consistent with the thickness of the positioning strip.

[0009] Preferably, the adsorption unit comprises a piston seat, the piston seat is in contact with the inner wall of the mounting groove, and a push spring abutting against the end of the mounting groove is fixed to the inner end of the piston seat.

[0010] Preferably, a limit strip is fixed in the installation groove, and the piston seat is in contact with the outer wall of the limit strip, and a retraction groove for recovering the push spring is provided at the end of the installation groove.

[0011] Preferably, a rotating column is rotatably mounted on the outer end of the piston seat, and a positioning plate is rotatably mounted on the outer side of the rotating column, a limiting opening matched with the positioning plate is opened on the limiting strip, and a diamond-shaped opening is opened on the outer end of the rotating column.

[0012] Preferably, an extension tube is fixed in the groove at a position corresponding to the mounting slot.

[0013] Preferably, a plurality of the adsorption holes are provided and are evenly spaced and distributed on both sides of the mounting groove. An internal thread groove is provided inside the adsorption hole, and an anti-leakage member is installed inside the adsorption hole.

[0014] Preferably, the anti-leakage component comprises a capillary tube threadedly installed in the adsorption hole, a limiting ring is fixed to the bottom of the capillary tube, and a rubber plate is arranged in the capillary tube, and the rubber plate is fixed to the inner wall of the capillary tube by a connecting belt.

[0015] Preferably, a fitting surface that fits with the rubber plate is provided inside the limiting ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention improves the traditional docking method between the flexible printing plate and the printing plate cylinder. By designing a positioning strip on the flexible printing plate and cooperating with the tensioning unit, the tensioning positioning of the flexible printing plate is achieved. At the same time, the adsorption unit designed in the printing plate cylinder is cooperated to achieve the adsorption positioning of the flexible printing plate. The tensioning positioning and the adsorption positioning cooperate with each other, so that the positioning of the flexible printing plate is stable and not prone to deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the connection between the printing plate cylinder and the cover plate of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the groove at the end of the printing plate cylinder of the present invention in a partial cross-section;

[0021] Figure 4 It is a schematic diagram of the distribution of adsorption holes and receiving grooves on the printing plate cylinder of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the adsorption unit of the present invention in two states;

[0023] Figure 6 It is a top view schematic diagram of the adsorption unit of the present invention in two states;

[0024] Figure 7 It is a partial cross-sectional rear side view of the plate cylinder port of the present invention;

[0025] Figure 8 It is a partial cross-sectional rear side view of the tensioning unit of the present invention;

[0026] Fig. 9 The figure is a schematic diagram of the positional relationship between the internal vent holes and the mounting grooves of the printing plate cylinder according to the present invention after partial cross-section.

[0027] In the figure: 1. frame plate; 2. impression roller; 3. plate roller; 4. groove; 5. cover plate; 6. drive shaft; 7. flexible plate; 8. insertion port; 9. positioning strip; 10. tension unit; 11. mounting slot; 12. adsorption unit; 13. adsorption hole; 14. airway; 15. vent; 16. rotating rod; 17. driving motor; 18. tension cylinder; 19. disc spring; 20. storage slot; 21. piston seat; 22. push spring; 23. limit strip; 24. retraction slot; 25. rotating column; 26. positioning plate; 27. limit port; 28. extension tube; 29. ​​anti-leakage part; 30. capillary; 31. limit ring; 32. rubber plate; 33. fitting surface; 34. gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0029] Example 1: Please refer to Figure 1 - Figure 4 as well as Figure 7 and Figure 8 The fully servo-driven flexographic printing machine shown in the figure comprises two frame plates 1, between which a pressing cylinder 2 is rotatably mounted, and a plate cylinder 3 mounted between the two frame plates 1, with grooves 4 provided at both ends of the plate cylinder 3, with cover plates 5 fixed at both ends of the two plate cylinders 3, with a driving shaft 6 fixed on the outer side of the cover plates 5, and a mounting seat connected to the driving shaft 6 is mounted between the two frame plates 1; and a flexible plate 7 sleeved on the outer side of the plate cylinder 3, with insertion ports 8 connected to the groove 4 provided at both ends of the plate cylinder 3, with positioning strips 9 matched to the insertion ports 8 fixed at the bottom of both ends of the flexible plate 7, with a tensioning unit 10 for pulling and positioning the positioning strip 9 installed in the groove 4, and with two mounting grooves 11 provided in the groove 4; and an adsorption unit 12 mounted in the mounting groove 11, with adsorption holes 13 provided on the plate cylinder 3, with an air passage 14 connected to the adsorption holes 13 provided on the plate cylinder 3, and with an air vent 15 connected to the air passage 14 provided in the mounting groove 11;

[0030] In this solution, the traditional printing plate cylinder 3 and the flexible printing plate 7 are optimized, and the designed positioning strip 9 is extended into the insertion port 8, and the positioning strip 9 is tightened by the designed tensioning unit 10, so that the flexible printing plate 7 can be tightly positioned on the outside of the printing plate cylinder 3, and the designed adsorption unit 12 is used to evacuate air, so that the adsorption hole 13 can adsorb the flexible printing plate 7, thereby improving the positioning stability of the flexible printing plate 7. Compared with the traditional double-sided adhesive positioning method, the positioning effect of the flexible printing plate 7 is stronger, and it can effectively prevent it from being offset during the printing process;

[0031] It should be noted that: the two ends of the plate cylinder 3 in this solution are fixed to the cover plate 5 by screws, the driving shaft 6 at the outer end of the cover plate 5 is connected to the mounting seat, and is driven by the power provided by the external servo motor.

[0032] For further information, see Figure 3 as well as Figure 7 - Fig. 9 The tensioning unit 10 includes two rotating rods 16 rotatably installed in the groove 4. The two rotating rods 16 are rotatably connected to the inner wall of the groove 4 through a bearing seat. A driving motor 17 is installed in the groove 4. The output end of the driving motor 17 is fixed to the outer end of one of the rotating rods 16 through a coupling. A tensioning cylinder 18 is provided on the outer side of the rotating rod 16. A disc spring 19 is fixed between the rotating rod 16 and the tensioning cylinder 18. The two tensioning cylinders 18 are synchronously reversed to achieve the pulling down of the positioning bar 9. The outer sides of the two rotating rods 16 are fixed with gears 34 that mesh with each other.

[0033] The principle of tightening and positioning the positioning strip 9 by the tensioning unit 10 is as follows: first, the personnel put the flexible printing plate 7 on the outside of the printing plate cylinder 3, and at the same time align the positioning strips 9 at both ends of the flexible printing plate 7 with the insertion port 8 and insert them, and then use the drive motor 17 to drive one of the gears 34 to rotate, and cooperate with the mutual engagement of the two gears 34, so that the two rotating rods 16 rotate synchronously in opposite directions, and drive the two tensioning cylinders 18 to rotate synchronously in opposite directions, so that the positioning strip 9 between the two tensioning cylinders 18 is pulled down and positioned, so as to realize the tightening and positioning of the flexible printing plate 7. Compared with the traditional double-sided adhesive positioning method, the tightening and positioning is more stable, and can avoid the occurrence of displacement and looseness during long-term rotation.

[0034] It should be noted that the tension cylinder 18 is connected to the rotating rod 16 through the disc spring 19. When the rotating rod 16 rotates, it can drive the tension cylinder 18 to rotate accordingly. During the rotation process, the tension cylinder 18 will drive the positioning bar 9 to pull down. After being pulled to the limit position, the rotating rod 16 can continue to rotate, so that the disc spring 19 can rotate and accumulate force. In the later stage, it can continuously provide a downward pulling force to the positioning bar 9 to keep it in the downward position, thereby avoiding the deviation of the flexible printing plate 7 during the printing process.

[0035] It should also be noted that the outer surfaces of the tension tube 18 and the positioning strip 9 are both made of frosted material.

[0036] For further information, see Figure 4 - Figure 6 and Fig. 9 The adsorption unit 12 includes a piston seat 21, which fits the inner wall of the mounting groove 11, and a push spring 22 that abuts against the end of the mounting groove 11 is fixed to the inner end of the piston seat 21;

[0037] Among them, in order to enable the piston seat 21 to slide stably in the installation groove 11, a limit strip 23 is fixed in the installation groove 11, and the piston seat 21 fits against the outer wall of the limit strip 23. At the same time, in order to allow the push spring 22 to have sufficient compression space, a retraction groove 24 for recovering the push spring 22 is opened at the end of the installation groove 11. In order to extend the moving path of the piston seat 21, an extension tube 28 is fixed at the position corresponding to the installation groove 11 in the groove 4.

[0038] For further information, see Figure 4 and Fig. 9 A plurality of adsorption holes 13 are provided, which are evenly spaced and distributed on both sides of the mounting groove 11. An internal thread groove is provided inside the adsorption hole 13, and an anti-leakage member 29 is installed inside the adsorption hole 13;

[0039] The anti-leakage component 29 includes a capillary tube 30 threadedly installed in the adsorption hole 13, a limiting ring 31 is fixed to the bottom of the capillary tube 30, a rubber plate 32 is arranged in the capillary tube 30, and the rubber plate 32 is fixed to the inner wall of the capillary tube 30 by a connecting belt.

[0040] The adsorption unit 12 satisfies the principle of adsorption and positioning of the flexible printing plate 7:

[0041] First, a person pushes the piston seat 21 into the installation groove 11 with the help of a tool, so that the push spring 22 is in a compressed state, and then the person sets the flexible printing plate 7 on the outside of the printing plate cylinder 3, and then releases the tool against the piston seat 21. Under the action of the push spring 22, the push piston seat 21 moves outward, so that the installation groove 11 is in a negative pressure state, so that the airway 14, the vent hole 15 and the adsorption hole 13 are in a negative pressure state, and the flexible printing plate 7 is adsorbed and positioned by the adsorption hole 13;

[0042] When one of the adsorption holes 13 accidentally loses air, the negative pressure in the adsorption hole 13 will cause the rubber plate 32 to change from an upwardly convex state to a concave state, thereby abutting against the limit ring 31 and sealing the capillary 30, thereby preventing the pressure relief of the adsorption hole 13 from affecting the adsorption of the flexible printing plate 7 by other adsorption holes 13.

[0043] It should be noted that the rubber sheet 32 ​​and the connecting belt in the anti-leakage part 29 are made of rubber material. When not affected by external force, the connecting belt is elastic so that the rubber sheet 32 ​​is pushed upward in a convex state, away from the limiting ring 31. After the adsorption hole 13 accidentally releases pressure, the adsorption hole 13 will be in a negative pressure state, so that the rubber sheet 32 ​​is adsorbed into a concave state. At the same time, a fitting surface 33 that fits with the rubber sheet 32 ​​is provided in the limiting ring 31, so that the rubber sheet 32 ​​and the limiting ring 31 fit more closely and the sealing effect is better.

[0044] In this solution, the process of installing the flexible printing plate 7 includes the following steps:

[0045] The first step is to disassemble the plate cylinder 3 with the help of tools and prepare the flexible printing plate 7 to be installed;

[0046] In the second step, with the help of a tool, the piston seat 21 is inserted into the interior of the mounting groove 11, and the flexible printing plate 7 is sleeved on the outside of the printing plate cylinder 3, and the positioning strips 9 at both ends of the flexible printing plate 7 are aligned with the insertion opening 8 and inserted, and the positioning strips 9 are tightened and positioned by the tensioning unit 10;

[0047] In the third step, the personnel remove the tool that abuts against the piston seat 21, and the piston seat 21 is pushed outward under the action of the push spring 22, so that the negative pressure of the adsorption hole 13 adsorbs and positions the flexible printing plate 7;

[0048] In the fourth step, the plate cylinder 3 of the mounted flexible printing plate 7 is mounted on the mounting seats on the two frame plates 1 .

[0049] In the present solution, the joint of the flexible printing plate 7 ring sleeve is positioned by adsorption using the adsorption hole 13, and the two ends are tightened by the tensioning unit 10. The stable installation of the flexible printing plate 7 is achieved through the dual positioning effects of adsorption and tensioning. At the same time, the adsorption unit 12 of the present solution pushes the piston seat 21 outward through the push spring 22 to generate a negative pressure environment in the adsorption hole 13, thereby achieving the adsorption of the flexible printing plate 7. The push spring 22 can continuously push the piston seat 21 outward, so that negative pressure can be continuously generated in the adsorption hole 13, which can maintain the adsorption effect on the flexible printing plate 7 even when there is a small amount of air deflation. In the event of a large amount of air deflation unexpectedly, the adsorption hole 13 is sealed with the help of the anti-air leakage part 29, so that a single adsorption hole 13 that has deflated is sealed, which does not affect the normal adsorption effect of other adsorption holes 13, further ensuring the stable positioning of the flexible printing plate 7.

[0050] Example 2: Please refer to Figure 5 and Figure 6 This embodiment further explains the first embodiment, and the difference lies in that the piston seat 21 is improved so that it can be actively locked when it is pushed into the installation groove 11.

[0051] Specifically, a rotating column 25 is rotatably mounted on the outer end of the piston seat 21, a positioning plate 26 is rotatably mounted on the outer side of the rotating column 25, a limiting opening 27 adapted to the positioning plate 26 is opened on the limiting strip 23, and a diamond-shaped opening is opened on the outer end of the rotating column 25;

[0052] In this solution, when the personnel uses a diamond rod-shaped tool to dock with the prismatic opening at the outer end of the rotating column 25 and push the piston seat 21 into the installation groove 11 to the limit opening 27, the personnel rotates the tool to drive the rotating column 25 to rotate, so that the positioning plate 26 is against the limit opening 27, thereby completing the locking and positioning of the piston seat 21. After the personnel installs the flexible printing plate 7 on the outside, the rotating column 25 is rotated to make the positioning plate 26 disengage from the limit opening 27, and the piston seat 21 is pushed outward by the push spring 22.

[0053] Example 3: Please refer to Figure 4 and Figure 7 This embodiment further illustrates other embodiments, and the difference lies in that the insertion port 8 on the plate cylinder 3 is optimized.

[0054] Specifically, a receiving groove 20 is opened on the outer side of the insertion port 8, and the depth of the receiving groove 20 is consistent with the thickness of the positioning strip 9. The design of the receiving groove 20 makes the joint between the positioning strip 9 and the flexible printing plate 7 fit more smoothly on the printing plate cylinder 3 to avoid bulges.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Fully servo driven flexographic printing press, including: Two frame plates (1), with an impression roller (2) rotatably mounted between the two frame plates (1); It is characterized by further comprising: A printing plate cylinder (3) is installed between two frame plates (1), grooves (4) are provided at both ends of the printing plate cylinder (3), cover plates (5) are fixed at both ends of the two printing plate cylinders (3), and a driving shaft (6) is fixed on the outside of the cover plates (5), and a mounting seat connected to the driving shaft (6) is installed between the two frame plates (1); and, A flexible printing plate (7) is sleeved on the outside of a printing plate cylinder (3), the printing plate cylinder (3) is provided with insertion openings (8) at both ends thereof and connected to the groove (4), and positioning strips (9) adapted to the insertion openings (8) are fixed to the bottoms of both ends of the flexible printing plate (7), a tensioning unit (10) for pulling and positioning the positioning strip (9) is installed in the groove (4), and two installation grooves (11) are provided in the groove (4); and, The adsorption unit (12) is installed in the installation groove (11), the printing plate cylinder (3) is provided with an adsorption hole (13), the printing plate cylinder (3) is also provided with an air passage (14) connected to the adsorption hole (13), and the installation groove (11) is provided with an air vent (15) connected to the air passage (14); the adsorption unit (12) comprises a piston seat (21), the piston seat (21) is in contact with the inner wall of the installation groove (11), and the inner end of the piston seat (21) is fixed with a piston that abuts against the end of the installation groove (11). a push spring (22); a plurality of adsorption holes (13) are provided and are evenly spaced on both sides of the mounting groove (11); an internal thread groove is provided inside the adsorption hole (13); and an anti-leakage component (29) is installed inside the adsorption hole (13); the anti-leakage component (29) comprises a capillary tube (30) threadedly installed inside the adsorption hole (13); a limiting ring (31) is fixed at the bottom of the capillary tube (30); and a rubber plate (32) is provided inside the capillary tube (30); the rubber plate (32) is fixed to the inner wall of the capillary tube (30) via a connecting belt.

2. The fully servo-driven flexographic printing press according to claim 1, characterized in that: The tensioning unit (10) comprises two rotating rods (16) rotatably mounted in the groove (4), the two rotating rods (16) being rotatably docked with the inner wall of the groove (4) via a bearing seat, and a driving motor (17) being mounted in the groove (4), the output end of the driving motor (17) being fixed to the outer end of one of the rotating rods (16) via a coupling, a tensioning cylinder (18) being provided on the outer side of the rotating rod (16), and a disc spring (19) being fixed between the rotating rod (16) and the tensioning cylinder (18), the positioning bar (9) being pulled down by synchronously reversing the two tensioning cylinders (18), and mutually meshing gears (34) being fixed on the outer sides of the two rotating rods (16).

3. The fully servo-driven flexographic printing press according to claim 1, characterized in that: A receiving groove (20) is provided on the outer side of the insertion opening (8), and the depth of the receiving groove (20) is consistent with the thickness of the positioning strip (9).

4. The fully servo-driven flexographic printing press according to claim 1, characterized in that: A limit strip (23) is fixed in the installation groove (11), and the piston seat (21) is in contact with the outer wall of the limit strip (23). A retraction groove (24) for recovering the push spring (22) is provided at the end of the installation groove (11).

5. The fully servo-driven flexographic printing press according to claim 4, characterized in that: A rotating column (25) is rotatably mounted on the outer end of the piston seat (21), and a positioning plate (26) is rotatably mounted on the outer side of the rotating column (25); a limiting opening (27) matching the positioning plate (26) is formed on the limiting strip (23), and a diamond-shaped opening is formed on the outer end of the rotating column (25).

6. The fully servo-driven flexographic printing press according to claim 1, characterized in that: An extension tube (28) is fixed in the groove (4) at a position corresponding to the mounting groove (11).

7. The fully servo-driven flexographic printing press according to claim 6, characterized in that: The limiting ring (31) is provided with a fitting surface (33) fitted with the rubber plate (32).

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