A double-lift swing-armed offset printing mechanism

Abstract

The present application relates to a kind of double-lifted swing arm type offset printing mechanism, which is provided with plate roller station, first lifting swing arm and second lifting swing arm on the frame, first lifting swing arm is provided with first mounting part for mounting transfer roller, second lifting swing arm is provided with second mounting part for mounting impression roller, plate roller station is arranged above first mounting part, and second mounting part is arranged below first mounting part. Wherein, double-lifted swing arm structure is adopted, which can be used for assembling transfer roller and impression roller respectively, and the corresponding transfer roller and impression roller are lifted and lowered by swing lifting mode, and a larger operation space can be left for assembly after mutual separation by corresponding swing arm swing, the space occupied by double-lifted swing arm structure is relatively compact, and the disassembly and assembly convenience of each roller is improved, which meets the assembly of transfer roller with different sizes and diameters, and runs more stably. When closing pressure and pressure release are disconnected, the size of closing pressure is adjusted relatively conveniently, and it is not easy to interfere with each other, and it is not easy to conflict when lifting upward during closing pressure.

Description

Technical Field

[0002] This invention relates to offset printing mechanisms in printing equipment. This invention is a divisional application of application number 202510385737.8, filed on March 29, 2025. Background Technology

[0003] Offset printing equipment consists of a plate roller, a transfer roller, and a substrate roller (i.e., a bearing roller) working together for offset printing. The transfer roller is positioned between the plate roller and the substrate roller. During printing, the plate roller and the transfer roller are required to maintain a closed-roll state in sequence. In continuous, non-retractable printing operations on substrates (such as rolls of paper), different diameter plate rollers (such as their cylinders) need to be replaced to accommodate different length units of printing patterns. This necessitates replacing the transfer rollers (such as their cylinders) with matching specifications. The ease of disassembly and assembly of each roller is crucial. Furthermore, during printing, the rollers maintain a closed-roll state in sequence, and the pressure of this closed-roll state needs to be adjusted to ensure appropriate printing results. When pausing, they also need to be separated (disengaged). Additionally, horizontally movable, separate structures tend to occupy a relatively large space and have poor operational stability. Summary of the Invention

[0004] In view of the technical problems existing in the background art, the technical problem to be solved by the present invention is to provide a double lifting swing arm offset printing mechanism.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a double-lifting swing arm offset printing mechanism, characterized in that: its frame is provided with a printing roller station, a first lifting swing arm and a second lifting swing arm, the first lifting swing arm is provided with a first mounting part for mounting a transfer roller, the first swing support axis of the first lifting swing arm is located on the rear side of the first mounting part, the second lifting swing arm is provided with a second mounting part for mounting a printing roller, the second swing support axis of the second lifting swing arm is located on the rear side of the second mounting part, the printing roller station is arranged above the first mounting part, the second mounting part is arranged below the first mounting part, the first swing support axis and the second swing support axis are both arranged horizontally from left to right, and the first swing support axis and the second swing support axis are arranged coaxially or oppositely.

[0006] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0007] It also includes a swing drive structure, a first lifting swing arm and a second lifting swing arm that are connected to the swing drive structure.

[0008] For example, the swing drive structure includes a first transmission drive device, which includes a lifting seat, a lifting drive device, a first transmission shaft, a second transmission shaft, a transmission arm, and a first rotary clutch eccentric sleeve. The lifting seat is connected to the lifting drive device. The first transmission shaft is mounted on the lifting seat, and the second transmission shaft is mounted on the first lifting swing arm. One end of the transmission arm is connected to the first transmission shaft, and the other end of the transmission arm is connected to the second transmission shaft. A first rotary clutch eccentric sleeve is also provided between the transmission arm and the first transmission shaft and / or the second transmission shaft. The first rotary clutch eccentric sleeve is connected to a corresponding first rotary drive device, which is mounted on the lifting seat and / or on the first lifting swing arm.

[0009] One end of the first lifting swing arm is connected to the first support shaft, and the second transmission shaft is located at the other end of the first lifting swing arm. The axis of the first support shaft is the axis of the first swing support. The first mounting part is located between the first support shaft and the second transmission shaft. The first support shaft is connected to the frame. The first lifting swing arm includes a paired left swing arm and a right swing arm. The left swing arm is provided with a roller changing port and a roller body support end cover, which is connected to the roller changing port. The first transmission shaft is located below the second transmission shaft. The first support shaft is located behind the second transmission shaft. The lifting seat is located in front of the second transmission shaft. The first lifting swing arm is also provided with a first arc-shaped guide rail for swing guide support. The lifting seat is configured on the vertical guide rail, which is set on the frame. The lifting drive device includes a lifting drive motor, a lifting drive screw, and a lifting drive nut. The lifting drive motor is driven by the lifting drive screw, and the lifting drive screw is driven by the lifting drive nut. The lifting drive nut is mounted on the lifting seat. The lifting drive screw is vertically arranged.

[0010] A first rotary clutch eccentric sleeve is fitted on a first transmission shaft. One end of the transmission arm is fitted on a second transmission shaft, and the other end of the transmission arm is fitted on the first rotary clutch eccentric sleeve. The first rotary drive device includes a first rotary drive cylinder, which is connected to a lifting seat. The first rotary clutch eccentric sleeve has a first connecting swing arm, which is connected to the first rotary drive cylinder in a transmission connection.

[0011] In addition, the lifting seat is also connected to a first eccentric sleeve rotation limit adjustment device; the first rotary drive cylinder has a first push-pull piston rod, the first cylinder body of the first rotary drive cylinder is hinged on the lifting seat, the first push-pull piston rod is hinged to the first connecting swing arm, the first eccentric sleeve rotation limit adjustment device includes a first limit part, the first limit part is located at the head of the first limit axis displacement adjustment rod, and the first limit axis displacement adjustment rod is arranged on the lifting seat.

[0012] Furthermore, the swing drive structure includes a second transmission drive device, which includes a third transmission shaft and a fourth transmission shaft. The third transmission shaft is connected to the first lifting swing arm, and the fourth transmission shaft is connected to the second lifting swing arm. The second transmission drive device also includes a pitch adjustment device for adjusting the distance between the third and fourth transmission shafts. The pitch adjustment device includes a lead screw and nut pitch adjustment transmission mechanism, which is connected between the third and fourth transmission shafts. A second rotary clutch eccentric sleeve is also provided between the pitch adjustment device and the third and / or fourth transmission shafts. The second rotary clutch eccentric sleeve is driven by a corresponding second rotary drive device, which is mounted on the first lifting swing arm and / or the second lifting swing arm.

[0013] The fourth transmission shaft is fitted with a second rotary clutch eccentric sleeve, the lead screw and nut pitch adjustment transmission mechanism is fitted on the second rotary clutch eccentric sleeve, the second rotary drive device includes a second rotary drive cylinder, the second rotary drive cylinder is connected to the second lifting swing arm, the second rotary clutch eccentric sleeve has a second connecting swing arm, and the second connecting swing arm is connected to the second rotary drive cylinder in a transmission connection.

[0014] Further optimizations include a second eccentric sleeve rotation limit adjustment device connected to the second lifting arm; a second rotary drive cylinder with a second push-pull piston rod; a second cylinder body of the second rotary drive cylinder hinged to the second lifting arm; a second push-pull piston rod hinged to the second connecting arm; a second eccentric sleeve rotation limit adjustment device including a second limit part located at the head of a second limit shaft adjustment rod; and a second limit shaft adjustment rod configured on the second lifting arm. The lead screw and nut pitch adjustment transmission mechanism includes a lead screw support, a transmission lead screw, and a transmission nut. The transmission lead screw is configured on the lead screw support, and the transmission lead screw and transmission nut are connected in a transmission connection. One of the lead screw support and the transmission nut is connected to the first lifting arm via a third transmission shaft, and the other is connected to the second lifting arm via a second rotary clutch eccentric sleeve and a fourth transmission shaft.

[0015] In this configuration, one end of the second lifting swing arm is connected to the second support shaft, the fourth transmission shaft is located at the other end of the second lifting swing arm, the axis of the second support is the axis of the second swing support, the second mounting part is located between the second support shaft and the fourth transmission shaft, and the second support shaft is connected to the frame; the second support shaft is located behind the fourth transmission shaft, and the second lifting swing arm is also equipped with a second arc-shaped guide rail for swing guide support; the second swing support axis is disposed below the first swing support axis, wherein the second swing support axis is disposed behind the first swing support axis.

[0016] The beneficial effects of this invention are as follows: the double lifting swing arm offset printing mechanism adopts a double lifting swing arm structure, which can be used to assemble the transfer roller and the substrate roller respectively. The corresponding transfer roller and substrate roller are raised and lowered respectively by swinging and lifting. After the corresponding swing arms (first lifting swing arm and second lifting swing arm) swing and separate from each other, a large operating space can be freed up for assembly. The double lifting swing arm structure occupies a relatively compact space, and the convenience of disassembling and assembling each roller (transfer roller, substrate roller, and even plate roller) is improved, which can meet the assembly of transfer rollers of different diameters. The corresponding swing arms (first lifting swing arm and second lifting swing arm) are supported and swing relatively stably. When the pressure is applied and when the pressure is released, the first lifting swing arm and the second lifting swing arm move in sequence. The adjustment of the pressure between the plate roller and the transfer roller, and between the transfer roller and the substrate roller is relatively convenient and does not interfere with each other. Moreover, when the pressure is applied, they are all raised upwards, which does not easily cause conflict. Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 for Figure 1 Another labeled diagram.

[0020] Figure 3 for Figure 2 Sectional view of AA.

[0021] In the picture: 1. Transfer roller; 10. Roller shaft; 2. First lifting swing arm; 20. First support shaft; 21. Left swing arm; 22. Roller changing port; 23. Roller body support end cover; 24. Movable locking block; 3. First transmission drive device; 30. Lifting seat; 31. First transmission shaft; 32. Second transmission shaft; 33. Transmission arm; 34. Lifting drive device; 35. First rotary clutch eccentric sleeve; 36. First rotary drive device; 37. Vertical guide rail; 38. First eccentric sleeve rotation limit adjustment device; 341. Lifting drive motor; 342. Lifting drive lead screw; 351. First connecting swing arm; 361. First rotary drive cylinder; 3611. First push-pull piston rod; 3612. First cylinder body; 381. First limiting part; 382. First limiting axis displacement adjusting rod; 4. Frame; 41. First arc-shaped guide rail; 42. Second arc-shaped guide rail; 5. Second lifting arm; 50. Second support shaft; 6. Printing roller; 7. Printing roller; 8. Second transmission drive device; 80. Lead screw and nut pitch adjustment transmission mechanism; 83. Third transmission shaft; 84. Fourth transmission shaft; 85. Second rotary clutch eccentric sleeve; 86. Second rotary drive device; 88. Second eccentric sleeve rotation limit adjustment device; 801. Lead screw support; 802. Lead screw; 803. Lead screw nut; 851. Second connecting swing arm; 861. Second rotary drive cylinder; 8611. Second push-pull piston rod; 8612. Second cylinder body; 881. Second limiting part; 882. Second limiting axis displacement adjusting rod. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the implementation of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Referring to the accompanying drawings, in this embodiment, a double-lifting swing arm type offset printing mechanism has a frame 4 equipped with a plate roller station, a first lifting swing arm 2, and a second lifting swing arm 5. The first lifting swing arm 2 has a first mounting portion for mounting a transfer roller 1 (such as a roller shaft 10 and a roller cylinder). The first swing support axis of the first lifting swing arm 2 is located behind the first mounting portion. The first lifting swing arm 2 swings up and down around the first swing support axis to raise or lower the transfer roller 1 mounted thereon. The second lifting swing arm 5 has a second mounting portion for mounting a receiving roller 7. The second swing support axis of the second lifting swing arm 5 is located behind the second mounting portion. The second lifting swing arm 5 swings up and down around the second swing support axis to raise or lower the receiving roller 7 mounted thereon. The plate roller station is positioned above the first mounting portion. When the transfer roller 1 mounted at the first mounting portion is raised or lowered with the first lifting swing arm 2, it can cooperate with the plate roller 6 at the plate roller station to perform pressing and discharging (i.e., disengaging). The second mounting part is located below the first mounting part. When the printing roller 7 (i.e., the bottom roller) mounted at the second mounting part is raised or lowered with the second lifting swing arm 5, it can cooperate with the transfer roller 1 at the first mounting part to perform pressing and discharging (i.e., detachment). In addition, the first swing support axis and the second swing support axis are both arranged horizontally from left to right. The first swing support axis and the second swing support axis are either coaxial or off-axis.

[0024] In this double-lifting swing arm offset printing mechanism, a double-lifting swing arm structure is adopted, which can be used to assemble the transfer roller 1 and the substrate roller 7 respectively. The transfer roller 1 and the substrate roller 7 are raised and lowered respectively by swinging and lifting. After the corresponding swing arms (first lifting swing arm 2 and second lifting swing arm 5) swing and separate from each other, a large operating space can be freed up for assembly. The double-lifting swing arm structure occupies a relatively compact space, and the convenience of disassembling and assembling each roller (transfer roller 1, substrate roller 7, and even plate roller 6) is improved, which can meet the assembly of transfer roller 1 with different diameters. The corresponding swing arms (first lifting swing arm 2 and second lifting swing arm 5) are supported and swing relatively stably. When the pressure is closed and the pressure is released, the first lifting swing arm 2 and the second lifting swing arm 5 move in sequence. The adjustment of the pressure between the plate roller 6 and the transfer roller 1, and between the transfer roller 1 and the substrate roller 7 is relatively convenient and does not interfere with each other. Moreover, when the pressure is closed, they are all raised upwards, which does not easily cause conflict.

[0025] Based on the above embodiments, the following optimizations or further explanations can be made.

[0026] For example, a double-lifting swing arm offset printing mechanism also includes a swing drive structure, with the first lifting swing arm 2 and the second lifting swing arm 5 being driven by the swing drive structure. That is, the first lifting swing arm 2 and the second lifting swing arm 5 are driven to swing up and down, raising and lowering the transfer roller 1 or the substrate roller 7 mounted on it. There are various ways to implement the swing drive structure, such as using cylinders or motors to drive the lifting and swinging motion separately. The swing drive structure includes a first transmission drive device 3, which is driven by the first lifting swing arm 2 to drive it to rise and fall; the swing drive structure also includes a second transmission drive device 8, which is driven by the second lifting swing arm 5 to drive it to rise and fall.

[0027] The following optimization scheme is adopted in this embodiment. The swing drive structure includes a first transmission drive device 3, which includes a lifting seat 30, a lifting drive device 34, a first transmission shaft 31, a second transmission shaft 32, a transmission arm 33, and a first rotary clutch eccentric sleeve 35. The lifting seat 30 is connected to the lifting drive device 34. The first drive shaft 31 is mounted on the lifting seat 30 and is driven by the lifting drive device 34 to move the lifting seat 30 up and down. The first drive shaft 31 moves up and down with the lifting seat 30. The second drive shaft 32 is mounted on the first lifting arm 2 and moves up and down with the first lifting arm 2. One end of the drive arm 33 is connected to the first drive shaft 31 and the other end is connected to the second drive shaft 32. The first drive shaft 31 and the second drive shaft 32 are connected by the drive arm 33. When the first drive shaft 31 moves up and down with the lifting seat 30, the first drive shaft 31 can drive the second drive shaft 32 on the first lifting arm 2 through the drive arm 33 (push and pull), so that the first lifting arm 2 swings up and down around the first support shaft 20.

[0028] The transmission arm 33 is further provided with a first rotary clutch eccentric sleeve 35 between the transmission arm 33 and the first transmission shaft 31 and / or the second transmission shaft 32. This sleeve can be installed in one location or both locations. In the embodiment shown in the figure, the first rotary clutch eccentric sleeve 35 is located between the transmission arm 33 and the first transmission shaft 31. Furthermore, the first rotary clutch eccentric sleeve 35 is connected to a corresponding rotary drive device. The first rotary clutch eccentric sleeve 35 is driven to rotate by the first rotary drive device 36, thereby changing the relative position between the transmission arm 33 and the first transmission shaft 31 and / or the second transmission shaft 32. This allows for a small additional range of swinging and lifting of the first lifting arm 2 and the transfer roller 1 mounted on it (matching the eccentric range of the eccentric sleeve), which can be used to switch between the pressure-on and pressure-off states during printing operations (with the printing plate roller 6). The corresponding first rotary drive device 36 is provided on the lifting seat 30 and / or the corresponding first rotary drive device 36 is provided on the first lifting swing arm 2; for example, if the first rotary clutch eccentric sleeve 35 is connected to the first transmission shaft 31, the corresponding first rotary drive device 36 can be provided on the lifting seat 30; or, for example, if the first rotary clutch eccentric sleeve 35 is connected to the second transmission shaft 32, the corresponding first rotary drive device 36 can be provided on the first lifting swing arm 2.

[0029] The working principle is as follows: when it is necessary to replace or disassemble the transfer roller 1, the lifting seat 30 moves (e.g., descends) and drives the first lifting swing arm 2 downward through the transmission arm 33, leaving sufficient operating space above to facilitate the replacement and assembly of the transfer roller 1 (e.g., its cylinder), making disassembly, assembly, and maintenance relatively convenient; of course, the downward swing of the first lifting swing arm 2 can also separate the transfer roller 1 from other structures above, allowing the transfer roller 1 to be in an idle state (e.g., when the machine is stopped); the lifting seat 30 returns to its original position (e.g., rises) and drives the first lifting swing arm 2 upward through the transmission arm 33, allowing the transfer roller 1 installed above to move closer to other structures above (e.g., the printing roller 6) for printing operations. When the lifting seat 30 returns to its original position, the first lifting arm 2 also swings upward accordingly. After that, the first rotary clutch eccentric sleeve 35 can be rotated additionally, thereby driving the first lifting arm 2 and the transfer roller 1 installed on it to swing and rise additionally within a small range (matching the eccentric range of the eccentric sleeve), in coordination with the switching of pressure separation (i.e., disengagement) and pressure engagement states in the printing operation.

[0030] Driven by the first transmission drive device 3, the first lifting swing arm 2 can not only be driven by the lifting seat 30 to achieve a large stroke and wide range of vertical swinging, but also, after the first lifting swing arm 2 swings downward to its final position, leave sufficient operating space above it for easy replacement and assembly of transfer rollers 1 of different sizes. Furthermore, the first lifting swing arm 2 can also (when the lifting seat 30 has moved (e.g., risen) to its final position) be further operated by the first rotary clutch eccentric sleeve 35 to achieve a small range of swinging and lifting, coordinating with the switching of the pressure and disengagement states of the transfer roller 1 during printing operations. Moreover, by operating the rotation angle of the first rotary clutch eccentric sleeve 35, the pressure during pressing can be adjusted according to printing needs, fine-tuning the pressure point to ensure the optimal pressure state. The transfer roller 1 will engage in pressure and disengagement with the upper plate roller 6. The lifting and lowering linear motion of the lifting seat 30 is combined with the conversion to drive the first lifting arm 2 to swing up and down (arc trajectory). The lifting and lowering operation of the lifting seat 30 is relatively stable. Moreover, one end of the first lifting arm 2 is not only supported by the first swing support axis, but also supported and driven by the second transmission shaft 32. The swing operation of the first lifting arm 2 is relatively stable.

[0031] It can be further optimized. One end of the first lifting swing arm 2 is connected to the first support shaft 20, and the second transmission shaft 32 is located at the other end of the first lifting swing arm 2. The axis of the first support shaft 20 is the first swing support axis. The first mounting part is located between the first support shaft 20 and the second transmission shaft 32. The first support shaft 20 is connected to the frame 4. This forms a support structure at both ends of the first lifting swing arm 2, making the up-and-down swing operation of the first lifting swing arm 2 more stable, and the operation of the transfer roller 1 is also relatively stable.

[0032] For example, the first lifting arm 2 includes a paired left arm 21 and a right arm. The left arm 21 is provided with a roller changing port 22, which is used to facilitate the axial movement and replacement of the transfer roller 1 (such as its roller shaft). The left arm 21 is provided with a roller body support end cover 23, which is connected to the roller changing port 22. The roller body support end cover 23 is used to support the transfer roller 1 (such as its roller shaft 10) at the roller changing port 22. The roller body support end cover 23 can adopt a detachable structure. For example, the roller body support end cover 23 is hinged to the left arm 21 and locked by a movable locking block 24.

[0033] Furthermore, the first transmission shaft 31 is positioned below the second transmission shaft 32, allowing it to support and hold the second transmission shaft 32 from below, resulting in a more stable structure. The first support shaft 20 is located behind the second transmission shaft 32, and the lifting seat 30 is located in front of it, creating a rational spatial layout that facilitates assembly. The first lifting arm 2 is also equipped with a first arc-shaped guide rail 41 for swing guidance support, ensuring stable swinging of the first lifting arm 2. The arc-shaped guide rail can be mounted on the frame 4 and can also be positioned at the far end (i.e., the head) of the first lifting arm 2.

[0034] The lifting seat 30 can be configured on the vertical guide rail 37, which can be installed on the frame 4, allowing the lifting seat 30 to move stably vertically up and down. The lifting drive device 34 includes a lifting drive motor 341 (such as a servo motor), a lifting drive screw 342, and a lifting drive nut. The lifting drive motor 341 is connected to the lifting drive screw 342, which is connected to the lifting drive nut. The lifting drive nut is installed on the lifting seat 30. The lifting drive screw 342 is vertically oriented. The lifting drive motor 341 drives the lifting drive nut to move up and down via the lifting drive screw 342, thus enabling the lifting seat 30 to move up and down on the vertical guide rail 37. The lifting drive structure operates stably and can accurately stop at a preset position. After stopping, it can maintain a stable position and is not easily loosened, ensuring printing stability and withstanding the pressure during printing.

[0035] For example, in one embodiment shown in the figure, the first rotary clutch eccentric sleeve 35 is positioned as follows: the first rotary clutch eccentric sleeve 35 is fitted onto the first transmission shaft 31; one end of the transmission arm 33 is fitted onto the second transmission shaft 32; and the other end of the transmission arm 33 is fitted onto the first rotary clutch eccentric sleeve 35. That is, the two circular holes at both ends of the transmission arm 33 are respectively fitted onto the second transmission shaft 32 and the first rotary clutch eccentric sleeve 35 to form a linkage transmission structure. The first rotary clutch eccentric sleeve 35 is positioned between the transmission arm 33 and the first transmission shaft 31. Additionally, the first rotary drive device 36 includes a first rotary drive cylinder 361, which is connected to the lifting mechanism. On the seat 30, the first rotary drive cylinder 361 rises and falls together with the lifting seat 30 and can drive the first rotary clutch eccentric sleeve 35 to rotate and change its relative position. In addition, the first rotary clutch eccentric sleeve 35 has a first connecting swing arm 351. The first connecting swing arm 351 rotates together with the first rotary clutch eccentric sleeve 35 (which can be an integral structure or a separate structure). The first connecting swing arm 351 is connected to the first rotary drive cylinder 361. The first rotary drive cylinder 361 drives the first connecting swing arm 351 to swing, thereby driving the first rotary clutch eccentric sleeve 35 to rotate (back and forth). This structure not only has a reasonable transmission, but also facilitates subsequent limit adjustment.In addition, a first eccentric sleeve rotation limit adjustment device 38 is connected to the lifting seat 30. The first eccentric sleeve rotation limit adjustment device 38 limits and adjusts the rotation position of the first rotary clutch eccentric sleeve 35 to ensure that the rotation angle position of the first rotary clutch eccentric sleeve 35 is at a position with a suitable pressing pressure, and to ensure that the pressing pressure state is reasonable. For example, the first rotary drive cylinder 361 has a first push-pull piston rod 3611, and the first cylinder body 3612 of the first rotary drive cylinder 361 is hinged to the lifting seat 30. The first push-pull piston rod 3611 is hinged to the first connecting swing arm 351. The first eccentric sleeve rotation limit adjustment device 38 includes a first limit part 381, which is located at the head of the first limit shaft displacement adjustment rod 382 (which can be a lead screw, etc.). The first limit shaft displacement adjustment rod 382 is disposed on the lifting seat 30. By adjusting the position of the first limit shaft displacement adjustment rod 382 (such as a lead screw, which can be rotated and adjusted by a motor or handwheel, etc.) on the lifting seat 30, the position of the upper limit part is adjusted. The axial movement adjustment direction of the first limiting shaft displacement adjusting rod 382 is up and down; when the first push-pull piston rod 3611 drives the first connecting swing arm 351 to rotate to the position, the first limiting part 381 blocks (the first connecting swing arm 351) so that the first connecting swing arm 351 can smoothly reach the position; for example, the first rotary drive cylinder 361 and the first limiting part 381 are respectively arranged on the upper and lower sides of the first connecting swing arm 351. For example, the first limiting part 381 is located on the lower side of the first connecting swing arm 351, and the first rotary drive cylinder 361... Located above the first connecting swing arm 351, the first limiting part 381, due to its different height, can hold the first connecting swing arm 351 in place by the first rotary drive cylinder 361, limiting its downward movement. The first push-pull piston rod 3611 of the first rotary drive cylinder 361 can be pushed into place in one go, providing high stability. This allows for the limiting adjustment of the rotational position of the first rotary clutch eccentric sleeve 35, ensuring that the rotation angle of the first rotary clutch eccentric sleeve 35 is at a suitable pressing pressure level and that the pressing pressure is at a reasonable level. Alternatively, other types of first rotary drive devices 36 and eccentric sleeve rotation limiting adjustment devices 38 can be used, such as eccentric sleeve rotation limiting adjustment devices 38 including a limiting adjustment screw on the lifting seat 30.

[0036] Furthermore, the swing drive structure includes a second transmission drive device 8, which includes a third transmission shaft 83 and a fourth transmission shaft 84. The third transmission shaft 83 is connected to the first lifting swing arm 2, and the fourth transmission shaft 84 is connected to the second lifting swing arm 5. The second transmission drive device 8 also includes a pitch adjustment device for adjusting the distance between the third transmission shaft 83 and the fourth transmission shaft 84. For example, the pitch adjustment device includes a lead screw and nut pitch adjustment transmission mechanism 80. The pitch adjustment transmission mechanism 80 adjusts the distance between the third transmission shaft 83 and the fourth transmission shaft 84. That is, the lead screw and nut pitch adjustment transmission mechanism 80 is connected between the third transmission shaft 83 and the fourth transmission shaft 84. The pitch adjustment device (such as the lead screw and nut pitch adjustment transmission mechanism 80) can make the third transmission shaft 83 and the fourth transmission shaft 84 approach each other and separate each other, so that the second lifting swing arm 5 can swing relative to the first lifting swing arm 2 under the action of the second transmission drive device 8, and can even achieve pressure adjustment. In addition, a second rotary clutch eccentric sleeve 85 is provided between the adjusting device (such as the lead screw and nut adjusting transmission mechanism 80) and the third transmission shaft 83 and / or the fourth transmission shaft 84; it can be set in one place or both places; in the embodiment shown in the figure, the second rotary clutch eccentric sleeve 85 is set between the fourth transmission shaft 84 and the lead screw and nut adjusting transmission mechanism 80. The second rotary clutch eccentric sleeve 85 is connected to a corresponding second rotary drive device 86. The second rotary clutch eccentric sleeve 85 is driven by the second rotary drive device 86 to rotate, thereby changing the relative position between the lead screw and nut adjusting transmission mechanism 80 and the third transmission shaft 83 and / or the fourth transmission shaft 84, realizing the additional small range of swing lifting of the second lifting arm 5 and the printing roller 7 installed on it (matching the eccentric range of the eccentric sleeve). The second lifting arm 5 can swing a small range relative to the first lifting arm 2, which can be used to switch the pressure-on and pressure-off states (with the transfer roller 1) in the printing operation. The corresponding second rotary drive device 86 is set on the first lifting arm 2 and / or the corresponding second rotary drive device 86 is set on the second lifting arm 5. For example, if the second rotary clutch eccentric sleeve 85 is connected to the fourth transmission shaft 84, the corresponding second rotary drive device 86 can be set on the second lifting arm 5.

[0037] For example, in one embodiment shown in the figure, the second rotary clutch eccentric sleeve 85 is positioned as follows: the second rotary clutch eccentric sleeve 85 is sleeved on the fourth transmission shaft 84, and the lead screw and nut pitch adjustment transmission mechanism 80 is sleeved on the second rotary clutch eccentric sleeve 85; in addition, the second rotary drive device 86 includes a second rotary drive cylinder 861, which is connected to the second lifting swing arm 5. The second rotary drive cylinder 861 moves up and down with the second lifting swing arm 5 and can drive the second rotary clutch eccentric sleeve 85 to rotate and change its relative position; furthermore... The second rotary clutch eccentric sleeve 85 has a second connecting swing arm 851. The second connecting swing arm 851 rotates together with the second rotary clutch eccentric sleeve 85 (which can be an integral or separate structure). The second connecting swing arm 851 is connected to the second rotary drive cylinder 861. The second rotary drive cylinder 861 drives the second connecting swing arm 851 to swing, thereby driving the second rotary clutch eccentric sleeve 85 to rotate (back and forth). This structure not only has a reasonable transmission but also facilitates subsequent limit adjustment. In addition, the second lifting swing arm 5 is also connected to a second eccentric sleeve rotation limit adjustment device 88. The second eccentric sleeve rotation limit adjustment device 88 limits the rotation position of the second rotary clutch eccentric sleeve 85 to ensure that the rotation angle position of the second rotary clutch eccentric sleeve 85 is at a position with a suitable pressing pressure, and to ensure that the pressing pressure state is reasonable. For example, the second rotary drive cylinder 861 has a second push-pull piston rod 8611 and a second cylinder body 86. 12 is hinged to the second lifting swing arm 5. The second push-pull piston rod 8611 is hinged to the second connecting swing arm 851. The second eccentric sleeve rotation limit adjustment device 88 includes a second limit part 881, which is located at the head of the second limit axis displacement adjustment rod 882 (which can be a lead screw, etc.). The second limit axis displacement adjustment rod 882 is disposed on the second lifting swing arm 5. The second limit axis displacement adjustment rod 882 (such as a lead screw, which can be rotated by a motor or handwheel, etc.) can be adjusted by adjusting the second limit axis displacement adjustment rod 882. The position of the second lifting swing arm 5 drives the position adjustment of the upper limiting part. For example, the axial movement adjustment direction of the second limiting shaft adjustment rod 882 is front and back adjustment. When the second push-pull piston rod 8611 drives the second connecting swing arm 851 to rotate to the position, the second limiting part 881 blocks (the second connecting swing arm 851) so that the second connecting swing arm 851 can smoothly reach the position. For example, the second rotary drive cylinder 861 and the second limiting part 881 are respectively arranged on the same side of the second connecting swing arm 851. By utilizing the different front and back positions of the second limiting part 881, the position of the second connecting swing arm 851 after being driven by the second rotary drive cylinder 861 can be blocked. The second push-pull piston rod 8611 of the second rotary drive cylinder 861 can be pulled to the position in one go, with high stability. It can limit and adjust the rotation position of the second rotary clutch eccentric sleeve 85 to ensure that the rotation angle position of the second rotary clutch eccentric sleeve 85 is the position of the appropriate pressing pressure and to ensure that the pressing pressure state is reasonable.

[0038] For example, the lead screw and nut pitch adjustment transmission mechanism 80 includes a lead screw support 801, a lead screw 802, and a lead nut 803. The lead screw 802 is mounted on the lead screw support 801, and the lead screw 802 and the lead nut 803 are connected in a transmission manner. One of the lead screw support 801 and the lead nut 803 is connected to the first lifting arm 2 via a third transmission shaft 83, and the other is connected to the second lifting arm 5 via a fourth transmission shaft 84. The lead screw 802 on the lead screw support 801 can be driven to rotate or move axially by a handwheel or a motor.

[0039] For example, one end of the second lifting arm 5 is connected to the second support shaft 50, the fourth transmission shaft 84 is located at the other end of the second lifting arm 5, the axis of the second support is the axis of the second swing support, the second mounting part is located between the second support shaft 50 and the fourth transmission shaft 84, the second support shaft 50 is connected to the frame 4; the second support shaft 50 is located behind the fourth transmission shaft 84, the second lifting arm 5 is also equipped with a second arc-shaped guide rail 42 for swing guide support; the second swing support axis is arranged below the first swing support axis, and the second swing support axis is arranged behind the first swing support axis.

Claims

1. A double-lifting swing arm offset printing mechanism, characterized in that: Its frame (4) is equipped with a printing roller station, a first lifting swing arm (2) and a second lifting swing arm (5) and a swing drive structure. The first lifting arm (2) is provided with a first mounting part for mounting the transfer roller (1), and the first swing support axis of the first lifting arm (2) is located on the rear side of the first mounting part. The second lifting arm (5) is provided with a second mounting part for mounting the printing roller (7), and the second swing support axis of the second lifting arm (5) is located on the rear side of the second mounting part. The printing roller station is positioned above the first mounting section, and the second mounting section is positioned below the first mounting section. Both the first and second swing support axes are arranged laterally from left to right. The first swing support axis and the second swing support axis are set to be coaxial or opposite axes; The swing drive structure includes a first transmission drive device (3), which is connected to the first lifting swing arm (2) in a transmission manner. The swing drive structure includes a second transmission drive device (8), which is connected to the second lifting swing arm (5) in a transmission connection.

2. The offset printing mechanism with double lifting swing arms as described in claim 1, characterized in that: The first transmission drive device (3) includes a lifting seat (30), a lifting drive device (34), a first transmission shaft (31), a second transmission shaft (32), a transmission arm (33), and a first rotary clutch eccentric sleeve (35). The lifting seat (30) is connected to the lifting drive device (34) via a transmission. The first transmission shaft (31) is mounted on the lifting seat (30). The second transmission shaft (32) is mounted on the first lifting arm (2). One end of the transmission arm (33) is connected to the first transmission shaft (31), and the other end of the transmission arm (33) is connected to the second transmission shaft (32); A first rotary clutch eccentric sleeve (35) is also provided between the transmission arm (33) and the first transmission shaft (31) and / or the second transmission shaft (32), and the first rotary clutch eccentric sleeve (35) is connected to a corresponding first rotary drive device (36). The corresponding first rotary drive device (36) is provided on the lifting seat (30) and / or the corresponding first rotary drive device (36) is provided on the first lifting swing arm (2).

3. The offset printing mechanism with double lifting swing arms as described in claim 2, characterized in that: One end of the first lifting swing arm (2) is connected to the first support shaft (20), the second transmission shaft (32) is located at the other end of the first lifting swing arm (2), the axis of the first support shaft (20) is the first swing support axis, the first mounting part is located between the first support shaft (20) and the second transmission shaft (32), and the first support shaft (20) is connected to the frame (4); The first lifting arm (2) includes a pair of left arm (21) and right arm. The left arm (21) is provided with a roller changing port (22) and a roller body support end cap (23) is provided on the left arm (21). The roller body support end cap (23) is connected to the roller changing port (22). The first transmission shaft (31) is located below the second transmission shaft (32), the first support shaft (20) is located behind the second transmission shaft (32), the lifting seat (30) is located in front of the second transmission shaft (32), and the first lifting arm (2) is also equipped with a first arc-shaped guide rail (41) for swing guide support. The lifting seat (30) is mounted on the vertical guide rail (37), which is set on the frame. The lifting drive device (34) includes a lifting drive motor (341), a lifting drive screw (342) and a lifting drive nut. The lifting drive motor (341) is connected to the lifting drive screw (342) in a transmission connection, and the lifting drive screw (342) is connected to the lifting drive nut in a transmission connection. The lifting drive nut is installed on the lifting seat (30). The lifting drive screw (342) is vertically arranged.

4. The offset printing mechanism with double lifting swing arms as described in claim 2, characterized in that: A first rotary clutch eccentric sleeve (35) is fitted onto the first transmission shaft (31). One end of the transmission arm (33) is sleeved on the second transmission shaft (32). The other end of the transmission arm (33) is fitted onto the first rotary clutch eccentric sleeve (35). The first rotary drive device (36) includes a first rotary drive cylinder (361), which is connected to the lifting seat (30). The first rotary clutch eccentric sleeve (35) has a first connecting arm (351), which is connected to the first rotary drive cylinder (361) in a transmission manner.

5. The offset printing mechanism with double lifting swing arms as described in claim 4, characterized in that: The lifting seat (30) is also connected to the first eccentric sleeve rotation limit adjustment device (38); The first rotary drive cylinder (361) has a first push-pull piston rod (3611), the first cylinder body (3612) of the first rotary drive cylinder (361) is hinged on the lifting seat (30), and the first push-pull piston rod (3611) is hinged to the first connecting swing arm (351). The first eccentric sleeve rotation limit adjustment device (38) includes a first limit part (381), which is located at the head of the first limit shaft displacement adjustment rod (382), which is disposed on the lifting seat (30).

6. A double-lifting swing arm offset printing mechanism as described in claim 3 or 4, characterized in that: The second transmission drive device (8) includes a third transmission shaft (83) and a fourth transmission shaft (84). The third transmission shaft (83) is connected to the first lifting arm (2), and the fourth transmission shaft (84) is connected to the second lifting arm (5). The second transmission drive device (8) also includes a pitch adjustment device for adjusting the distance between the third transmission shaft (83) and the fourth transmission shaft (84). The pitch adjustment device includes a lead screw and nut pitch adjustment transmission mechanism (80), and the lead screw and nut pitch adjustment transmission mechanism (80) is connected between the third transmission shaft (83) and the fourth transmission shaft (84). A second rotary clutch eccentric sleeve (85) is also provided between the adjusting device and the third transmission shaft (83) and / or the fourth transmission shaft (84), and the second rotary clutch eccentric sleeve (85) is connected to a corresponding second rotary drive device (86). The corresponding second rotary drive device (86) is disposed on the first lifting arm (2) and / or the corresponding second rotary drive device (86) is disposed on the second lifting arm (5).

7. The offset printing mechanism with double lifting swing arms as described in claim 6, characterized in that: A second rotary clutch eccentric sleeve (85) is fitted onto the fourth transmission shaft (84). The lead screw and nut pitch adjustment transmission mechanism (80) is sleeved on the second rotary clutch eccentric sleeve (85). The second rotary drive device (86) includes a second rotary drive cylinder (861), which is connected to the second lifting swing arm (5). The second rotary clutch eccentric sleeve (85) has a second connecting arm (851), which is connected to the second rotary drive cylinder (861) in a transmission manner.

8. The offset printing mechanism of the double lifting swing arm type as described in claim 7, characterized in that: The second lifting arm (5) is also connected to the second eccentric sleeve rotation limit adjustment device (88). The second rotary drive cylinder (861) has a second push-pull piston rod (8611), and the second cylinder body (8612) of the second rotary drive cylinder (861) is hinged to the second lifting swing arm (5). The second push-pull piston rod (8611) is hinged to the second connecting swing arm (851). The second eccentric sleeve rotation limit adjustment device (88) includes a second limit part (881), which is located at the head of the second limit shaft displacement adjustment rod (882), and the second limit shaft displacement adjustment rod (882) is disposed on the second lifting swing arm (5). The lead screw and nut pitch adjustment transmission mechanism (80) includes a lead screw support (801), a transmission lead screw (802) and a transmission nut (803). The transmission lead screw (802) is disposed on the lead screw support (801), and the transmission lead screw (802) and the transmission nut (803) are connected for transmission. One of the lead screw support (801) and the transmission lead screw nut (803) is connected to the first lifting arm (2) through the third transmission shaft (83), and the other is connected to the second lifting arm (5) through the second rotary clutch eccentric sleeve (85) and the fourth transmission shaft (84).

9. The offset printing mechanism of the double lifting swing arm type as described in claim 6, characterized in that: One end of the second lifting arm (5) is connected to the second support shaft (50), the fourth transmission shaft (84) is located at the other end of the second lifting arm (5), the axis of the second support is the axis of the second swing support, the second mounting part is located between the second support shaft (50) and the fourth transmission shaft (84), and the second support shaft (50) is connected to the frame (4); The second support shaft (50) is located behind the fourth transmission shaft (84). The second lifting arm (5) is also equipped with a second arc-shaped guide rail (42) for swing guide support; The second swing support axis is positioned below the first swing support axis. The second swing support axis is positioned behind the first swing support axis.

Images