Gearless low-noise flexographic printing unit

Abstract

The gearless low-noise flexographic printing unit comprises a rack, an ink box, an ink conveying roller, a printing plate roller and a printing roller which are arranged in a matched mode are arranged on the rack, and a roller shaft of the ink conveying roller is in direct driving connection with an output shaft of a first servo motor through a first connecting shaft; a roller shaft of the printing plate roller is in direct driving connection with an output shaft of a second servo motor through a parallel coupler, and a roller shaft of the printing roller is in direct driving connection with an output shaft of a third servo motor. The independent motors are adopted to drive the ink conveying roller, the printing plate roller and the printing roller to rotate, so that a transmission gear set is omitted, and transmission noise caused by low meshing precision is reduced; meanwhile, the parallel couplings are adopted to drive the printing plate rollers to rotate, so that rapid adjustment and installation of the printing plate rollers are achieved through the universal performance of the parallel couplings, and the remodeling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of flexographic printing press technology, and more specifically to a gearless, low-noise flexographic printing press unit. Background Technology

[0002] The working principle of a flexographic printing press is that the inking roller transfers ink from the ink cartridge to the printing plate roller. As the printing substrate passes between the printing plate roller and the substrate roller, the printing plate roller prints the image onto the substrate. In traditional flexographic printing presses, the inking roller, printing plate roller, and substrate roller are driven by a single motor and corresponding gear set. While this transmission method can reduce equipment production costs, it has the following problems in actual use: First, due to the low meshing precision of the gear set, there is significant noise during operation, affecting the physical and mental health of the workers; second, the printing plate roller usually needs to be replaced during production. Different printing plate rollers have different spacings from other rollers, requiring the replacement and adjustment of the entire transmission mechanism, resulting in numerous and tedious plate-changing operations. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a gearless, low-noise flexographic printing press unit, which can reduce equipment noise and improve equipment changeover efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A gearless, low-noise flexographic printing press includes a frame with an ink cartridge, an inking roller, a printing plate roller, and a printing plate roller mounted on it. The roller shaft of the inking roller is directly driven by the output shaft of a first servo motor via a first connecting shaft. The roller shaft of the printing plate roller is directly driven by the output shaft of a second servo motor via a parallel coupling. The roller shaft of the printing plate roller is directly driven by the output shaft of a third servo motor. This invention eliminates the need for a transmission gear set by using independent motors to drive the inking roller, printing plate roller, and printing plate roller separately, thus reducing transmission noise caused by low meshing precision. Simultaneously, by using a parallel coupling to drive the printing plate roller, the universal joint's versatility allows for rapid adjustment and installation of the printing plate roller, improving changeover efficiency.

[0005] As a preferred technical solution, the ink roller, the first connecting shaft, and the output shaft of the first servo motor are coaxially arranged, and the printing roller is coaxially arranged with the output shaft of the third servo motor.

[0006] As a preferred technical solution, the output shaft of the first servo motor is equipped with a connecting cylinder, and the first connecting shaft is drivenly connected to the connecting cylinder.

[0007] As a preferred technical solution, the connecting cylinder includes a cylinder body and a drive sleeve movably disposed within the cylinder body. The cylinder body is provided with a first air pipe interface and a second air pipe interface for controlling the axial movement of the drive sleeve along the shaft of the first servo motor. The first connecting shaft is rotatably inserted into the drive sleeve via a bearing.

[0008] As a preferred technical solution, the first connecting shaft has a first connecting part and a second connecting part at both ends. The output shaft of the first servo motor has a first connecting hole corresponding to the first connecting part. The first connecting part is inserted into the first connecting hole and can move axially along the first connecting hole. The end face of the second connecting part is provided with a second connecting hole adapted to the roller shaft of the ink conveying roller. The roller shaft of the ink conveying roller is provided with an insert. The side wall of the second connecting hole is provided with a groove corresponding to the insert. During assembly, the first connecting shaft is detachably connected to the roller shaft of the ink conveying roller through the second connecting hole. The end of the roller shaft of the ink conveying roller is embedded in the second connecting hole, and the insert is embedded in the groove.

[0009] As a preferred technical solution, the groove extends through to the end face of the second connecting part, and the end face of the second connecting part is provided with a positioning slope to facilitate the insertion of the insert into the groove.

[0010] As a preferred technical solution, a petal frame is hinged on the frame, and both ends of the printing plate roller are detachably mounted on the petal frame via roller rests. The frame is provided with a locking mechanism to fix the roller rests on the petal frame, and the roller shaft of the printing plate roller is rotatably connected to the roller rests via bearings.

[0011] As a preferred technical solution, the locking mechanism includes a locking cylinder, a locking hook, and a limiting frame. The lower end of the locking hook is connected to the piston rod of the locking cylinder via a rotating shaft and can be controlled by the locking cylinder to swing around the rotating shaft. The upper end of the locking hook is provided with a locking hook portion for locking the roller rest on the petal frame. The limiting frame is provided with a limiting groove for controlling the locking hook portion to move away from or closer to the roller rest. The locking hook is provided with a limiting roller that cooperates with the limiting groove. The limiting roller is rotatably embedded in the limiting groove and can move along the limiting groove.

[0012] As a preferred technical solution, the limiting groove has a vertical section and an inclined section connected to the upper end of the vertical section, and the tilting section is inclined from bottom to top in a direction away from the petal holder.

[0013] As a preferred technical solution, the parallel coupling includes a driving disc, an intermediate disc, and a driven disc. The intermediate disc is connected to the driving disc and the driven disc respectively through a connecting rod assembly. The output shaft of the second servo motor is fixedly connected to the driving disc through a first flange. The driven disc is connected to a second connecting shaft through a second flange. The end of the second connecting shaft is provided with a third connecting hole adapted to the roller shaft of the printing plate roller. During assembly, the roller shaft of the printing plate roller is inserted into the third connecting hole and can be driven to rotate by the second connecting shaft.

[0014] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, by using independent motors to drive the ink roller, printing plate roller and printing roller to rotate respectively, the transmission gear set is eliminated, reducing transmission noise caused by low meshing accuracy. At the same time, by using a parallel coupling to drive the printing plate roller to rotate, the universality of the parallel coupling is used to realize the rapid adjustment and installation of the printing plate roller, improving the changeover efficiency.

[0015] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present invention; Figure 3 This is an assembly state diagram of the ink roller drive structure according to an embodiment of the present invention; Figure 4 This is an exploded view of the ink roller drive structure according to an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the first servo motor according to an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is an assembly state diagram of the printing plate roller drive structure according to an embodiment of the present invention; Figure 8 This is an exploded structural diagram of the locking mechanism according to an embodiment of the present invention; Figure 9 This is an exploded view of the printing plate roller drive structure according to an embodiment of the present invention; Figure 10 This is an exploded view of the printing plate roller drive structure according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached diagram: 10. Frame; 11. First servo motor; 111. Connecting cylinder 112. Cylinder block; 113. Drive sleeve; 114. First air pipe interface 115. Second air pipe interface; 116. First connecting hole; 12. Second servo motor 13. Third servo motor; 14. Petal holder; 141. Support arm 15. Locking mechanism 151. Locking cylinder 152. Locking hook 153. Limiting bracket; 154. Locking hook; 155. Limiting groove 156. Limiting roller; 16. Adjustment mechanism; 17. Clearance hole 20. Ink cartridge; 30. Ink delivery roller; 31. Roller shaft 32. Insert block; 40. Printing plate roller; 41. Roller pillow 42, roller shaft 50, printing roller 60, driven roller 70. First connecting shaft; 71. First connecting part; 72. Second connecting part 73. Second connecting hole; 74. Groove; 75. Positioning bevel. 80. Parallel coupling; 81. Drive disc; 82. Intermediate disc 83. Driven disc; 84. Linkage assembly; 85. Second connecting shaft 86. Third connecting hole. Detailed Implementation

[0018] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] like Figure 1-10As shown, a gearless, low-noise flexographic printing press of the present invention includes a frame 10. The frame 10 is provided with an ink cartridge 20, an ink delivery roller 30, a printing plate roller 40, a printing roller 50, and a plurality of driven rollers 60. The roller shaft of the ink delivery roller 30 is directly driven and connected to the output shaft of a first servo motor 11 through a first connecting shaft 70. The ink delivery roller 30, the first connecting shaft 70, and the output shaft of the first servo motor 11 are coaxially arranged. The roller shaft of the printing plate roller 40 is directly driven and connected to the output shaft of a second servo motor 12 through a parallel coupling 80. The roller shaft of the printing roller 50 is directly driven and connected to the output shaft of a third servo motor 13. The output shaft of the printing roller 50 and the third servo motor 13 are coaxially arranged. This invention eliminates the need for transmission gear sets and reduces transmission noise caused by low meshing accuracy by using independent motors to drive the ink delivery roller 30, printing plate roller 40, and printing substrate roller 50 respectively. At the same time, by using a parallel coupling 80 to drive the printing plate roller 40, the universal joint of the parallel coupling 80 is used to achieve quick adjustment and installation of the printing plate roller 40, thereby improving changeover efficiency.

[0021] like Figure 3-6As shown, in this invention, the output shaft of the first servo motor 11 is provided with a connecting cylinder 111, and the first connecting shaft 70 is drivenly connected to the connecting cylinder 111. Specifically, the connecting cylinder 111 includes a cylinder body 112 and a driving sleeve 113 movably disposed within the cylinder body 112. The cylinder body 112 is provided with a first air pipe interface 114 and a second air pipe interface 115 for controlling the axial movement of the driving sleeve 113 along the shaft of the first servo motor 11. The first connecting shaft 70 is rotatably inserted into the driving sleeve 113 via bearings, and the first air pipe interface 114 and the second air pipe interface 115 are distributed along the axial direction of the first connecting shaft 70. The first connecting shaft 70 has a first connecting portion 71 and a second connecting portion 72 at both ends. The output shaft of the first servo motor 11 has a first connecting hole 116 corresponding to the first connecting portion 71. The first connecting portion 71 is inserted into the first connecting hole 116 and can move axially within the first connecting hole 116. The end face of the second connecting portion 72 is provided with a second connecting hole 73 adapted to the roller shaft 31 of the ink conveying roller 30. The roller shaft 31 of the ink conveying roller 30 is provided with an insert 32. The side wall of the second connecting hole 73 is provided with a groove 74 corresponding to the insert 32. During assembly, the first connecting shaft 70 is detachably connected to the roller shaft 31 of the ink conveying roller 30 through the second connecting hole 73. The end of the roller shaft of the ink conveying roller 30 is embedded in the second connecting hole 73, and the insert 32 is embedded in the groove 74. In order to enable the first servo motor 11 to drive the ink conveying roller 30 to rotate, the cross-sections of the first connecting portion 71 and the first connecting hole 116 are both non-circular. By connecting the cylinder 111 to the output shaft of the first servo motor 11, the disassembly and assembly of the ink delivery roller 30 are facilitated, making it convenient for replacement or cleaning and maintenance. When it is necessary to disassemble or assemble the ink delivery roller 30, gas can be introduced into the first air pipe interface 114 or the second air pipe interface 115, thereby causing the drive sleeve 113 to move relative to the cylinder body 112. In turn, the drive sleeve 113 drives the first connecting shaft 70 to move, causing the second connecting part 72 of the first connecting shaft 70 to move away from or closer to the roller shaft 31 of the ink delivery roller 30. It should be understood that in actual use, the second connecting hole 73 can also be provided on the end face of the roller shaft 31 of the ink delivery roller 30. In this case, the second connecting part 72 can be inserted into the second connecting hole 73 to achieve transmission.

[0022] In this invention, the groove 74 extends through to the end face of the second connecting part 72, and the end face of the second connecting part 72 is provided with a positioning inclined surface 75 to facilitate the insertion of the insert 32 into the groove 74. By providing the positioning inclined surface 75 on the end face of the second connecting part 72, the positioning inclined surface 75 abuts against the end face of the roller shaft 31 of the ink conveying roller 30 during connection, causing the ink conveying roller 30 to rotate. When the insert 32 is facing the groove 74, the second connecting part 72 moves towards the ink conveying roller 30, allowing the roller shaft of the ink conveying roller 30 to enter the second connecting hole 73, and the insert 32 is embedded in the groove 74, thereby realizing the driving connection between the first connecting shaft 70 and the ink conveying roller 30.

[0023] like Figure 7-9 As shown, a petal frame 14 is hinged to the frame 10. Both ends of the printing plate roller 40 are detachably mounted on the petal frame 14 via roller rests 41. The frame 10 is provided with a locking mechanism 15 to fix the roller rests 41 to the petal frame 14. The roller shaft of the printing plate roller 40 is rotatably connected to the roller rests 41 via bearings. The petal frame 14 includes two support arms 141, one end of which is hinged to each other, and the other end is away from each other and inclined upwards. The frame 10 is provided with an adjustment mechanism 16 for adjusting the tilt angle of the support arms 141 to change the installation height of the printing plate roller 40. The adjustment mechanism 16 includes a push screw and a locking screw. The push screw is threadedly connected to the frame 10, and the free end of the push screw abuts against the other end of the support arm 141. During adjustment, the push screw is rotated to move the free end of the push screw away from or closer to the support arm 141, thereby changing the tilt angle of the support arm 141. The locking screw is threadedly connected to the frame 10, and the automatic end of the locking screw abuts against the circumference of the push screw. When adjustment is required, the locking screw is moved away from the push screw, allowing the push screw to rotate. After adjustment, the locking screw abuts against the circumference of the push screw, preventing the push screw from rotating. In this invention, the frame 10 is provided with a clearance hole 17 through which the roller shaft of the printing plate roller 40 passes, connected to the parallel coupling 80. The clearance hole 17 extends vertically.

[0024] The locking mechanism 15 includes a locking cylinder 151, a locking hook 152, and a limiting frame 153. The lower end of the locking hook 152 is connected to the piston rod of the locking cylinder 151 via a rotating shaft and can be controlled by the locking cylinder 151 to swing around the rotating shaft. The upper end of the locking hook 152 is provided with a locking hook portion 154 for locking the roller pillow 41 onto the petal frame 14. The limiting frame 153 is provided with a limiting groove 155 for controlling the locking hook portion 154 to move away from or closer to the roller pillow 41. The locking hook 152 is provided with a limiting roller 156 that cooperates with the limiting groove 155. The limiting roller 156 is rotatably embedded in the limiting groove 155 and can move along the limiting groove 155.

[0025] Specifically, the limiting groove 155 has a vertical section and an inclined section connected to the upper end of the vertical section. The inclined section is inclined from bottom to top in a direction away from the petal holder 14. There are two sets of limiting rollers 156, with two rollers in each set. The two sets of limiting rollers 156 are symmetrically arranged on opposite sides of the locking hook 152. The limiting frame 153 has two limiting grooves 155 corresponding to the two sets of limiting rollers 156 respectively. When it is necessary to replace the printing plate roller 40 with a different one, the locking cylinder 151 controls the locking hook 152 to move upward. The locking hook part 154 of the locking hook 152 moves upward first and then moves away from the roller pillow 41 under the cooperation of the limiting roller 156 and the limiting groove 155, thereby releasing the locking of the roller pillow 41. At this time, the printing plate roller 40 and the roller pillow 41 can be removed from the petal frame 14. After replacing the new printing plate roller 40, the installation height of the printing plate roller 40 is first adjusted by the adjusting mechanism 16, and then the new printing plate roller 40 and the roller pillow 41 are locked on the petal frame 14 by the locking mechanism 15.

[0026] In this invention, the parallel coupling 80 includes a driving disc 81, an intermediate disc 82, and a driven disc 83. The intermediate disc 82 is connected to the driving disc 81 and the driven disc 83 respectively via a connecting rod assembly 84. The output shaft of the second servo motor 12 is fixedly connected to the driving disc 81 via a first flange. The driven disc 83 is connected to a second connecting shaft 85 via a second flange. The end of the second connecting shaft 85 is provided with a third connecting hole 86 adapted to the roller shaft 42 of the printing plate roller 40. During assembly, the roller shaft of the printing plate roller 40 is inserted into the third connecting hole 86. In order to enable the second connecting shaft 85 to drive the printing plate roller 40 to rotate, the cross-sections of the third connecting hole 86 and the roller shaft 42 of the printing plate roller 40 are both non-circular. The parallel coupling 80 adopts a mature product that can be directly purchased on the market, and its specific structure and working principle will not be described in detail here. It should be understood that, in actual use, the third connecting hole 86 can also be located on the end face of the roller shaft of the printing plate roller 40, and the second connecting shaft 85 can be inserted into the third connecting hole 86 to achieve transmission.

[0027] In summary, this invention eliminates the need for transmission gear sets and reduces transmission noise caused by low meshing accuracy by using independent motors to drive the ink delivery roller, printing plate roller, and printing substrate roller separately. At the same time, by using a parallel coupling to drive the printing plate roller, the universal joint of the parallel coupling is utilized to achieve rapid adjustment and installation of the printing plate roller, thereby improving changeover efficiency.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the actual technology of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A gearless, low-noise flexographic printing press unit, comprising a frame, on which are mounted a matching ink cartridge, an ink delivery roller, a printing plate roller, and a printing substrate roller, characterized in that, The roller shaft of the ink delivery roller is directly driven and connected to the output shaft of the first servo motor via a first connecting shaft. The roller shaft of the printing plate roller is directly driven and connected to the output shaft of the second servo motor via a parallel coupling. The roller shaft of the printing roller is directly driven and connected to the output shaft of the third servo motor.

2. The gearless, low-noise flexographic printing press unit according to claim 1, characterized in that, The ink delivery roller, the first connecting shaft, and the output shaft of the first servo motor are coaxially arranged, and the printing roller is coaxially arranged with the output shaft of the third servo motor.

3. The gearless, low-noise flexographic printing press unit according to claim 1 or 2, characterized in that, The output shaft of the first servo motor is equipped with a connecting cylinder, and the first connecting shaft is driven to connect with the connecting cylinder.

4. The gearless, low-noise flexographic printing press unit according to claim 3, characterized in that, The connecting cylinder includes a cylinder body and a drive sleeve movably disposed within the cylinder body. The cylinder body is provided with a first air pipe interface and a second air pipe interface for controlling the axial movement of the drive sleeve along the shaft of the first servo motor. The first connecting shaft is rotatably inserted into the drive sleeve via a bearing.

5. The gearless, low-noise flexographic printing press unit according to claim 3, characterized in that, The first connecting shaft has a first connecting part and a second connecting part at both ends. The output shaft of the first servo motor has a first connecting hole corresponding to the first connecting part. The first connecting part is inserted into the first connecting hole and can move axially along the first connecting hole. The end face of the second connecting part is provided with a second connecting hole adapted to the roller shaft of the ink conveying roller. The roller shaft of the ink conveying roller is provided with an insert. The side wall of the second connecting hole is provided with a groove corresponding to the insert. During assembly, the first connecting shaft is detachably connected to the roller shaft of the ink conveying roller through the second connecting hole. The end of the roller shaft of the ink conveying roller is embedded in the second connecting hole, and the insert is embedded in the groove.

6. The gearless, low-noise flexographic printing press unit according to claim 5, characterized in that, The groove extends through to the end face of the second connecting part, and the end face of the second connecting part is provided with a positioning slope to facilitate the insertion of the insert into the groove.

7. The gearless, low-noise flexographic printing press unit according to claim 1, characterized in that, The frame is hinged with a petal frame, and the two ends of the printing plate roller are detachably mounted on the petal frame via roller rests. The frame is provided with a locking mechanism to fix the roller rests on the petal frame, and the roller shaft of the printing plate roller is rotatably connected to the roller rests via bearings.

8. The gearless, low-noise flexographic printing press unit according to claim 7, characterized in that, The locking mechanism includes a locking cylinder, a locking hook, and a limiting frame. The lower end of the locking hook is connected to the piston rod of the locking cylinder via a rotating shaft and can be controlled by the locking cylinder to swing around the rotating shaft. The upper end of the locking hook is provided with a locking hook portion for locking the roller pillow onto the petal frame. The limiting frame is provided with a limiting groove for controlling the locking hook portion to move away from or closer to the roller pillow. The locking hook is provided with a limiting roller that cooperates with the limiting groove. The limiting roller is rotatably embedded in the limiting groove and can move along the limiting groove.

9. The gearless, low-noise flexographic printing press unit according to claim 8, characterized in that, The limiting groove has a vertical section and an inclined section connected to the upper end of the vertical section, and the tilting section is inclined from bottom to top in a direction away from the petal holder.

10. The gearless, low-noise flexographic printing press unit according to claim 1, characterized in that, The parallel coupling includes a driving disc, an intermediate disc, and a driven disc. The intermediate disc is connected to the driving disc and the driven disc respectively through a connecting rod assembly. The output shaft of the second servo motor is fixedly connected to the driving disc through a first flange. The driven disc is connected to a second connecting shaft through a second flange. The end of the second connecting shaft is provided with a third connecting hole adapted to the roller shaft of the printing plate roller. During assembly, the roller shaft of the printing plate roller is inserted into the third connecting hole and can be driven to rotate by the second connecting shaft.

Images