Double-swing-arm type offset printing device

Abstract

The invention relates to a double-swing-arm type offset printing device which is characterized in that a plate roller shaft is provided with a detachable and replaceable plate roller cylinder, a first swing arm is provided with a transfer printing roller shaft, the transfer printing roller shaft is provided with a detachable and replaceable transfer printing roller cylinder, a second swing arm is provided with a bottom roller, and the center distance between the transfer printing roller shaft and a first swing supporting shaft of the first swing arm is a first distance R1; the center distance between the bottom roller and a second swing supporting shaft of the second swing arm is a second distance R2, a circular arc corresponding to R1 and a circular arc corresponding to R2 are determined through the plate rollers with the large outer diameter specification, the middle outer diameter specification and the small outer diameter specification, and the overall structure can be reasonably arranged through the double-swing-arm type structure and the setting of the corresponding swing supporting axis position. After the printing roller and the transfer printing roller with different diameter specifications are replaced by the device, the center of the transfer printing roller and the center of the bottom roller can be ensured to be always close to a vertical straight line, and the deviation is extremely small.

Description

Technical Field

[0002] The present invention relates to printing equipment, and particularly to an offset printing device in the printing equipment. Background Art

[0003] In an offset printing device, there are a plate cylinder, a transfer cylinder, and an impression cylinder (i.e., a printing substrate cylinder) that cooperate for offset printing work, and the pattern (i.e., the printing unit) on the plate cylinder is offset printed onto a printing substrate (such as continuous paper, etc.). In order to adapt to printing units of different length dimensions, it is necessary to replace the plate cylinder with a corresponding diameter specification, and the transfer cylinder also needs to be replaced accordingly. Usually, the diameter specifications of the transfer cylinder and the plate cylinder match (such as being consistent within an error range). Among them, the plate cylinder and the transfer cylinder need to be in a closed pressure state during normal printing operation, and similarly, the transfer cylinder and the impression cylinder also need to be in a closed pressure state. This requires replacing the plate cylinder and the transfer cylinder with different diameter specifications. Before and after the replacement, the closed pressure position between the transfer cylinder and the impression cylinder changes, the closed pressure also changes, and the feeding position of the printing substrate also changes. These changes will all affect the printing quality of the printing substrate. 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 swing arm type offset printing device that can still ensure the printing quality effect when the closed pressure position between the transfer cylinder and the impression cylinder remains unchanged after replacing the corresponding roller specifications.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A double swing arm type offset printing device includes a plate cylinder shaft, a first swing arm, and a second swing arm. A detachable and replaceable plate cylinder is provided on the plate cylinder shaft. A transfer roller shaft is provided on the first swing arm, and a detachable and replaceable transfer roller is provided on the transfer roller shaft. The diameters of the plate cylinder and the transfer roller are matched. A bottom roller is provided on the second swing arm. The first swing arm is connected to the first swing support shaft. A first installation portion for installing the transfer roller shaft is provided on the first swing arm. The first swing support shaft is located behind the first installation portion. The center distance between the transfer roller shaft and the first swing support shaft is the first distance R1. The second swing arm is connected to the second swing support shaft. A second installation portion for installing the bottom roller is provided on the second swing arm. The second swing support shaft is located behind the second installation portion. The center distance between the bottom roller and the second swing support shaft is the second distance R2. It is characterized in that: Taking the axis point of the plate cylinder shaft as an end point, and making a ray L downward and forward by an angle β. Using plate cylinders with three outer diameter specifications of large, medium, and small to determine the planned running axis points corresponding to three transfer rollers with matching outer diameter specifications of large, medium, and small as a, b, and c respectively, and making a, b, and c lie on the ray L. The area of a, b, and c on the ray L forms a line segment D. Making the perpendicular bisector M of the line segment D. The swing support axis position o1 point of the first swing support shaft lies on the perpendicular bisector M. Taking o1 point as the center and R1 as the radius to make an arc C1, and making the planned running axis points a and c lie outside the arc C1, and the planned running axis point b lie inside the arc C1; The straight lines connecting o1 point with the planned running axis points a, b, and c intersect the arc C1 at points a′, b′, and c′ respectively. Respectively, taking points a′, b′, and c′ vertically downward and taking the sum of the radius of the corresponding specification transfer roller and the radius of the bottom roller as the distance to correspondingly determine the planned running axis points of the bottom roller as d, e, and f respectively; Determining an arc C2 with the planned running axis points d, e, and f of the bottom roller. The center of the arc C2 is determined as the planned running swing support axis position o2 point of the second swing support shaft; Or, making an arc C2′ with a radius of R2, and making the planned running axis points d and f lie outside the arc C2′, and the planned running axis point e lie inside the arc C2′. The center of the arc C2′ is determined as the swing support axis position o2′ point of the second swing support shaft, and the o2′ point falls on the line connecting the o2 point and the planned running axis point e or the o2′ point falls on the perpendicular bisector of the chord length corresponding to the arc C2.

[0006] The following various optimizations or supplementary explanations can be carried out respectively on the above technical solutions.

[0007] For example, 500 mm ≥ R1 ≥ 300 mm; 30° ≥ β ≥ 20°; 600 mm ≥ R2 ≥ 350 mm; The outer diameter specification of the bottom roller is 120 - 160 mm; The outer diameter specifications of the large, medium, and small plate cylinders are respectively selected as the maximum size, the medium size, and the minimum size preset at the factory.

[0008] For example, the length of R1 is set to 350 mm, the angle of β is set to 25 degrees, and the length of R2 is set to 400 mm; the outer diameter specifications of the large, medium and small plate rollers are 220 mm, 170 mm and 120 mm respectively, and the outer diameter specification of the bottom roller is set to 145 mm.

[0009] The plate roller shaft is installed on the frame, the first swing support shaft is installed on the frame, and the second swing support shaft is installed on the frame; the radius of the arc C1 is R1, and the radius of the arc C2 or the arc C2′ is R2.

[0010] For example, in further optimization, a plate roller station is arranged above the first mounting part, the plate roller shaft is arranged at the plate roller station, the second mounting part is arranged below the first mounting part, and the first swing support shaft and the second swing support shaft are both arranged horizontally left and right.

[0011] It also includes a swing driving structure, and a first swing arm and a second swing arm are transmission-connected to the swing driving structure.

[0012] 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 transmission-connected to the lifting drive device, the first transmission shaft is arranged on the lifting seat, the second transmission shaft is arranged on the first 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 arranged between the transmission arm and the first transmission shaft and / or the second transmission shaft, the first rotary clutch eccentric sleeve is transmission-connected to a corresponding first rotary drive device, the corresponding first rotary drive device is arranged on the lifting seat and / or the corresponding first rotary drive device is arranged on the first swing arm.

[0013] For further optimization, one end of the first swing arm is connected to the first swing support shaft, the second transmission rotating shaft is located at the other end of the first swing arm, the first mounting part is located between the first swing support shaft and the second transmission rotating shaft, and the first swing support shaft is connected to the machine frame; the first swing arm includes a paired left swing arm and a right swing arm, a roll changing port is provided on the left swing arm, and a roll body support end cover is provided on the left swing arm and is connected to the roll changing port; the first transmission rotating shaft is arranged below the second transmission rotating shaft, the first swing support shaft is located at the rear side of the second transmission rotating shaft, the lifting seat is located at the front side of the second transmission rotating shaft, and the first swing arm is also provided with a first arc-shaped guide rail for swing guiding support; the lifting seat is arranged on the vertical guide rail, the vertical guide rail is arranged on the machine frame, the lifting drive device includes a lifting drive motor, a lifting drive lead screw and a lifting drive nut, the lifting drive motor is in transmission connection with the lifting drive lead screw, and the lifting drive lead screw is in transmission connection with the lifting drive nut; the lifting drive nut is installed and connected to the lifting seat; the lifting drive lead screw is arranged vertically; a first rotating clutch eccentric sleeve is sleeved on the first transmission rotating shaft, one end of the transmission arm is sleeved on the second transmission rotating shaft, and the other end of the transmission arm is sleeved on the first rotating clutch eccentric sleeve. The first rotation drive device includes a first rotation drive cylinder, the first rotation drive cylinder is connected to the lifting seat, a first connection swing arm is provided on the first rotating clutch eccentric sleeve, and the first connection swing arm is in transmission connection with the first rotation drive cylinder; a first eccentric sleeve rotation limit adjustment device is also connected to the lifting seat; the first rotation drive cylinder has a first push-pull piston rod, the first cylinder body of the first rotation drive cylinder is hinged to the lifting seat, the first push-pull piston rod is hinged to the first connection swing arm, and 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 shaft displacement adjustment rod, and the first limit shaft displacement adjustment rod is arranged on the lifting seat.

[0014] For another example, the swing drive structure includes a second transmission drive device, the second transmission drive device includes a third transmission rotating shaft and a fourth transmission rotating shaft, the third transmission rotating shaft is connected to the first swing arm, the fourth transmission rotating shaft is connected to the second swing arm, the second transmission drive device also includes a distance adjustment device for adjusting the distance between the third transmission rotating shaft and the fourth transmission rotating shaft, the distance adjustment device includes a lead screw-nut distance adjustment transmission mechanism, and a lead screw-nut distance adjustment transmission mechanism is connected and arranged between the third transmission rotating shaft and the fourth transmission rotating shaft; a second rotating clutch eccentric sleeve is also provided between the lead screw-nut distance adjustment transmission mechanism and the third transmission rotating shaft and / or the fourth transmission rotating shaft, and the second rotating clutch eccentric sleeve is in transmission connection with a corresponding second rotation drive device, and the corresponding second rotation drive device is arranged on the first swing arm and / or the corresponding second rotation drive device is arranged on the second swing arm.

[0015] Additional optimization: A second rotating clutch eccentric sleeve is sleeved on the fourth transmission rotating shaft, and the screw-nut distance-adjusting transmission mechanism is sleeved on the second rotating clutch eccentric sleeve. The second rotating driving device includes a second rotating driving cylinder, which is connected to the second swing arm. The second rotating clutch eccentric sleeve has a second connecting swing arm, and the second connecting swing arm is in transmission connection with the second rotating driving cylinder; a second eccentric sleeve rotation limit adjusting device is also connected to the second swing arm. The second rotating driving cylinder has a second push-pull piston rod. The second cylinder body of the second rotating driving cylinder is hinged on the second swing arm, and the second push-pull piston rod is hinged to the second connecting swing arm. The second eccentric sleeve rotation limit adjusting device includes a second limiting part, and the second limiting part is located at the head of the second limit shaft displacement adjusting rod, and the second limit shaft displacement adjusting rod is arranged on the second swing arm; the screw-nut distance-adjusting transmission mechanism includes a screw support seat, a transmission screw rod, and a transmission nut. The transmission screw rod is arranged on the screw support seat, and the transmission screw rod is in mating transmission connection with the transmission nut; one of the screw support seat and the transmission nut is connected to the first swing arm through the third transmission rotating shaft, and the other is connected to the second swing arm through the second rotating clutch eccentric sleeve and the fourth transmission rotating shaft; one end of the second swing arm is connected to the second swing support shaft, the fourth transmission rotating shaft is located at the other end of the second swing arm, the second installation part is located between the second swing support shaft and the fourth transmission rotating shaft, and the second swing support shaft is connected to the frame; the second swing support shaft is located at the rear side of the fourth transmission rotating shaft, and the second swing arm is also equipped with a second arc-shaped guide rail for swing guiding support; the second swing support shaft is arranged below the first swing support shaft, and the second swing support shaft is arranged at the rear side of the first swing support shaft.

[0016] The beneficial effects are as follows: In the structure of this double swing arm type offset printing device, through the double swing arm type structure (including the first swing arm and the second swing arm) and setting the corresponding swing support center positions (i.e., point o1, point o2 or point o2'), the overall structure can be reasonably arranged. After the device replaces the plate cylinder and transfer cylinder with different diameter specifications (i.e., plate changing), it can still be smoothly and stably pressure-joined, especially the transfer cylinder and the bottom roller can be smoothly and stably pressure-joined. Moreover, it can better ensure that the center of the transfer cylinder and the center of the bottom roller are always close to being on a vertical straight line, with extremely small deviation, ensuring that the pressure value of the pressure joining between the transfer cylinder and the bottom roller is close to unchanged under different diameter specifications (i.e., different plate diameters). After plate changing, only a fine adjustment of the pressure joining value is required, or even no adjustment of the pressure joining value is needed; when the diameters of the plate cylinder and the transfer cylinder change, the pressure joining between the transfer cylinder and the bottom roller is close to the vertical direction, and the printing material (continuous web material) between the transfer cylinder and the bottom roller is almost in a horizontal feeding state. The printing pressure is the same and relatively consistent, ensuring the printing quality effect. Description of the Drawings

[0017] The following describes the implementation manners, relevant details and working principles of the embodiments of the present invention in conjunction with the drawings.

[0018] Figure 1 Schematic diagram of the structural principle in the present invention.

[0019] Figure 2 Schematic diagram showing the structural position matching relationship of the first and second swing support shafts in the present invention.

[0020] Figure 3 Structural diagram in the present invention based on Figure 1 of.

[0021] Figure 4 is Figure 3 Another marked diagram.

[0022] Figure 5 is Figure 4 the sectional view taken along A - A in.

[0023] In the figure: 1. Transfer roller; 10. Transfer roller shaft; 2. First swing arm; 20. First swing support shaft; 21. Left swing arm; 22. Roll changing port; 23. Roller body support end cover; 24. Movable lock block; 3. First transmission driving device; 30. Lifting seat; 31. First transmission rotating shaft; 32. Second transmission rotating shaft; 33. Transmission arm; 34. Lifting driving device; 35. First rotating clutch eccentric sleeve; 36. First rotating driving device; 37. Vertical guide rail; 38. First eccentric sleeve rotation limit adjusting device; 341. Lifting driving motor; 342. Lifting driving lead screw; 351. First connecting swing arm; 361. First rotating driving cylinder; 3611. First push - pull piston rod; 3612. First cylinder body; 381. First limiting part; 382. First limit shaft displacement adjusting rod; 4. Frame; 41. First arc guide rail; 42. Second arc guide rail; 5. Second swing arm; 50. Second swing support shaft; 6. Plate roller; 60. Axis point position of the plate roller shaft; 7. Bottom roller; 8. Second transmission driving device; 80. Lead screw - nut distance - adjusting transmission mechanism; 83. Third transmission rotating shaft; 84. Fourth transmission rotating shaft; 85. Second rotating clutch eccentric sleeve; 86. Second rotating driving device; 88. Second eccentric sleeve rotation limit adjusting device; 801. Lead screw support seat; 802. Transmission lead screw; 803. Transmission nut; 851. Second connecting swing arm; 861. Second rotating driving cylinder; 8611. Second push - pull piston rod; 8612. Second cylinder body; 881. Second limiting part; 882. Second limiting shaft displacement adjusting rod. Specific implementation manner

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present implementation manner of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] Referring to the accompanying drawings, in the embodiment of this implementation manner, a double swing arm type offset printing device includes a plate cylinder shaft and a transfer roller shaft. A detachable and replaceable plate cylinder is provided on the plate cylinder shaft, and a detachable and replaceable transfer roller is provided on the transfer roller shaft. The diameters of the plate cylinder and the transfer roller are matched, and different printing unit (length) requirements are met by replacing the size specifications. This is a mature technology and will not be elaborated here.

[0026] The double swing arm type offset printing device further includes a first swing arm and a second swing arm. The transfer roller shaft is arranged on the first swing arm, and the bottom roller is arranged on the second swing arm; wherein, the first swing arm is connected to the first swing support shaft, that is, the first swing support shaft swings and supports the first swing arm. A first installation part for installing the transfer roller shaft is provided on the first swing arm. The first swing support shaft is located behind the first installation part. The center distance between the transfer roller shaft and the first swing support shaft is the first distance R1, that is, the swing radius of the transfer roller shaft is R1; wherein, the second swing arm is connected to the second swing support shaft, that is, the second swing support shaft swings and supports the second swing arm. A second installation part for installing the bottom roller is provided on the second swing arm. The second swing support shaft is located behind the second installation part. The center distance between the bottom roller and the second swing support shaft is the second distance R2, that is, the swing radius of the bottom roller is R2.

[0027] In this double swing arm offset printing device, the relationship of the swing support axis position (i.e., the swing center of the first swing arm) of the first swing arm of the first swing arm will adopt the following structure: taking the axis point 60 of the plate cylinder shaft as an end point, and making a ray L downward and forward by an angle β, using three plate cylinders with large, medium and small outer diameter specifications (for example, the maximum size, the middle size (which can directly take the middle value of the maximum and minimum) and the minimum size plate cylinders preset in this device) to determine the corresponding planned running axis points of the three transfer cylinders with large, medium and small outer diameter specifications that are matched (paired) as a, b, and c respectively. The transfer cylinder can cooperate with the matched plate cylinder for smooth transfer at the corresponding planned running axis point along with the transfer roller shaft. This planned running axis point is the point designed in the plan when the transfer cylinder on the transfer roller shaft is working normally for printing, and a, b, and c are on the ray L. The area of these points a, b, and c on the ray L can form a line segment D; make the perpendicular bisector M of the line segment D, and the swing support axis position o1 point of the first swing support axis is located on the perpendicular bisector M, that is, set the swing support axis position o1 point of the first swing support axis on the perpendicular bisector M, and then set the position of the swing support axis position o1 point according to the size of R1 (that is, the swing radius of the transfer roller shaft is R1), that is, set the position of installing the first swing support axis. Among them, in order to make the position of the o1 point in this device relatively more reasonable, an arc C1 will also be made with the o1 point as the center (i.e., the center of the circle) and R1 as the radius, and make the planned running axis points a and c located outside the arc C1, and the planned running axis point b located inside the arc C1. In this way, during the process of the first swing arm swinging and adjusting the position, the actual point position of the transfer cylinder on the transfer roller shaft has little deviation from its planned running axis point, within an acceptable range, and will not affect the printing quality effect. Theoretically, the larger the R1 value, the more ideal and the smaller the deviation.

[0028] In the double-swing-arm offset printing device, the swing support axis center position of the second swing support shaft of the second swing arm (i.e., the swing center position of the second swing arm) will be determined by the following structure: wherein the straight lines connected with the planned operating axis points a, b, and c at point o1 intersect arc C1 at points a′, b′, and c′, and the distances are determined by the sum of the radius of the transfer roller of the corresponding specifications (referring to the three outer diameter specifications of large, medium, and small) (for example, the large-sized plate roller corresponds to the point a′, and the transfer roller of the same outer diameter specification) and the radius of the bottom roller vertically downward from the points a′, b′, and c′. The planned operating axis points of the fixed bottom roller are d, e, and f, which are the planned design points for the bottom roller when it is working normally in printing. The arc C2 is determined by the planned operating axis points d, e, and f of the bottom roller (that is, the arc is determined by three points), and the center of the arc C2 is determined as the planned operating swing support axis position o2 of the second swing support shaft. In this way, during the swing adjustment process of the second swing arm, except for the planned operating axis points d, e, and f, the actual positions of other points of the bottom roller do not deviate much from their planned operating axis points, are relatively more accurate, and are within an acceptable range. Alternatively, the swing center position of the second swing arm can be determined by the following structure: draw an arc C2′ with a radius R2, and make the planned operating axis points d and f located on the outside of the arc C2′, and the planned operating axis point e located on the inside of the arc C2′, and the center of the arc C2′ is determined to be the swing support axis position o2′ of the second swing support shaft, and the point o2′ falls on the line connecting the point o2 and the planned operating axis point e, or the point o2′ falls on the perpendicular midline of the chord length corresponding to the arc C2. In this structure, compared with the position of the point o2, the radius R2 corresponding to the point o2′ is relatively shorter (compared with the radius R2 corresponding to the point o2). Under the premise that the deviations between the other actual point positions of the bottom roller and their planned operating axis points are not large and meet the acceptable range, the entire machine structure will not cause the equipment size to become larger due to R2 being too large or too long. The equipment using the o2′ point structure is relatively small in size, avoiding the entire printing equipment (unit) from being too long.

[0029] Operation refers to the normal printing work of mutual pressure. When determining the positions of point o1, point o2 or point o2', especially the positions of point o2 or point o2', ensure that the center of the transfer roller and the center of the bottom roller are always close to each other and on a vertical straight line, with very small deviation, and control the front and rear position deviation t value of the bottom roller's running axis point (i.e. center point) to be less than or equal to 1 mm.

[0030] In the structure of this double swing arm type offset printing device, through the double swing arm type structure (including the first swing arm and the second swing arm) and setting the corresponding swing support axis positions (i.e., point o1, point o2 or point o2'), the overall structure can be reasonably arranged. After the device replaces the plate cylinder and transfer cylinder with different diameter specifications (i.e., plate changing), it can still be smoothly and stably closed for pressure, especially the smooth and stable closing for pressure between the transfer cylinder and the bottom roller. Moreover, it can better ensure that the center of the transfer cylinder and the center of the bottom roller are always close to being on a vertical straight line, with extremely small deviation, ensuring that the closing pressure value between the transfer cylinder and the bottom roller is close to unchanged under different diameter specifications (i.e., different plate diameters). After plate changing, only a fine adjustment of the closing pressure value is required, or even no adjustment of the closing pressure value is needed; when the diameters of the plate cylinder and the transfer cylinder change, the closing for pressure between the transfer cylinder and the bottom roller is close to the vertical direction, and the printing material (continuous roll material) between the transfer cylinder and the bottom roller is almost in a horizontal feeding state, with the same printing pressure, relatively consistent, and the printing quality is guaranteed.

[0031] Based on the above embodiments respectively, the following optimizations or further explanations can be made.

[0032] The value of R1 and the angle of β can be set according to requirements, but limited by conditions such as the size of the whole machine, they are set in the following suitable ranges: 500 mm ≥ R1 ≥ 300 mm; 30° ≥ β ≥ 20°, 600 mm ≥ R2 ≥ 350 mm; which is more reasonable and can also meet the requirements. For example, the length of R1 is set to 350 mm, the angle of β is set to 25°, and the length of R2 is set to 400 mm.

[0033] In addition, the outer diameter specifications of the large, medium and small plate cylinders can be 220 mm, 170 mm and 120 mm respectively, and the outer diameter specification of the bottom roller is 120 - 160 mm. The outer diameter specification of the bottom roller can take 145 mm with an error offset set as T ≤ 1 mm.

[0034] Among them, the plate roller shaft is installed on the frame, the first swing support shaft is installed on the frame, and the second swing support shaft is installed on the frame. Among them, the radius length of the circular arc C1 is R1, that is, the first distance, and the radius length of the circular arc C2 or the circular arc C2' is R2, that is, the second distance.

[0035] In addition, for the convenience of adjusting the positions of the first swing arm and the second swing arm, switching the states of closing for pressure and releasing pressure, and even debugging and adjusting the magnitude of the closing pressure, the following optimizations can also be made.

[0036] A plate roller station is arranged above the first mounting part, and the plate roller shaft is arranged at the plate roller station. When the transfer roller 1 installed at the first mounting part is lifted or lowered with the first swing arm 2, it can cooperate with the plate roller 6 at the plate roller station to perform pressing and releasing (i.e., disengaging). The second mounting part is arranged below the first mounting part. When the bottom roller 7 (i.e., the printing roller) installed at the second mounting part is lifted or lowered with the second swing arm 5, it can cooperate with the transfer roller 1 at the first mounting part to perform pressing and releasing (i.e., disengaging). The first swing support shaft and the second swing support shaft are both arranged horizontally from left to right.

[0037] The double lifting swing arm structure is adopted, which can be used for assembling the transfer roller 1 and the bottom roller 7 respectively, and the corresponding transfer roller 1 and the bottom roller 7 are lifted and lowered respectively by a swing lifting manner. After the corresponding swing arms (the first swing arm 2 and the second swing arm 5) swing and separate from each other, a larger operating space can be vacated for assembly. The space occupied by the double lifting swing arm structure is relatively compact, and the convenience of disassembly and assembly of each roller (the transfer roller 1, the bottom roller 7, and even the plate roller 6) is improved, which meets the assembly of transfer rollers 1 of different sizes and diameters. Among them, the corresponding swing arms (the first swing arm 2 and the second swing arm 5) are supported and swung to run more stably. When the pressure is applied and released, the first swing arm 2 and the second swing arm 5 move in sequence. The respective pressures between the plate roller 6 and the transfer roller 1, and between the transfer roller 1 and the bottom roller 7 are relatively convenient to adjust and are not easy to interfere with each other. Moreover, when the pressure is applied, they are all lifted upward and are not easy to conflict.

[0038] The following optimization or further explanation may be performed based on the above embodiments.

[0039] For example, the double lifting swing arm offset printing mechanism also includes a swing driving structure, and the first swing arm 2 and the second swing arm 5 are connected to the swing driving structure. That is, the first swing arm 2 and the second swing arm 5 are driven to swing up and down, so as to lift and lower the transfer roller 1 or the bottom roller 7 installed thereon. There are many swing driving structure methods, such as using cylinders or motors to drive the lifting and swinging separately.

[0040] The following optimization scheme is adopted in this embodiment: The swing drive structure includes a first transmission drive device 3. The first transmission drive device 3 includes a lifting seat 30, a lifting drive device 34, a first transmission rotating shaft 31, a second transmission rotating shaft 32, a transmission arm 33, and a first rotary clutch eccentric sleeve 35. Among them, the lifting seat 30 is in transmission connection with the lifting drive device 34. The first transmission rotating shaft 31 is arranged on the lifting seat 30 and is driven by the lifting drive device 34 to drive the lifting seat 30 to move up and down. The first transmission rotating shaft 31 moves up and down together with the lifting seat 30. The second transmission rotating shaft 32 is arranged on the first swing arm 2, and the first swing arm 2 and the second transmission rotating shaft 32 move up and down together. Among them, one end of the transmission arm 33 is connected to the first transmission rotating shaft 31, and the other end of the transmission arm 33 is connected to the second transmission rotating shaft 32. The first transmission rotating shaft 31 and the second transmission rotating shaft 32 are in transmission connection through the transmission arm 33. When the first transmission rotating shaft 31 moves up and down with the lifting seat 30, the first transmission rotating shaft 31 can drive the second transmission rotating shaft 32 on the first swing arm 2 through the transmission arm 33 (push and pull), so that the first swing arm 2 swings up and down around the first swing support shaft 20.

[0041] Among them, a first rotary clutch eccentric sleeve 35 is further provided between the transmission arm 33 and the first transmission rotating shaft 31 and / or the second transmission rotating shaft 32; it can be set at one place alternatively, or at both places; in the illustrated embodiment, the first rotary clutch eccentric sleeve 35 is arranged at the position between the transmission arm 33 and the first transmission rotating shaft 31. In addition, the first rotary clutch eccentric sleeve 35 is in transmission connection with a corresponding rotary drive device, and the first rotary clutch eccentric sleeve 35 is driven by the first rotary drive device 36 to rotate, so as to be able to change the relative position between the transmission arm 33 and the first transmission rotating shaft 31 and / or the second transmission rotating shaft 32, and realize an additional small range (matching the eccentric range of the eccentric sleeve) of swinging up and down of the first swing arm 2 and the transfer roller 1 installed thereon, which can cooperate with the switching of the pressing and releasing states (with the plate roller 6) in the printing operation. Among them, the corresponding first rotary drive device 36 is arranged on the lifting seat 30 and / or the corresponding first rotary drive device 36 is arranged on the first swing arm 2; for example, if the first rotary clutch eccentric sleeve 35 is connected to the first transmission rotating shaft 31, the corresponding first rotary drive device 36 can be arranged on the lifting seat 30; for another example, if the first rotary clutch eccentric sleeve 35 is connected to the second transmission rotating shaft 32, the corresponding first rotary drive device 36 can be arranged on the first swing arm 2.

[0042] The working principle is as follows: when it is necessary to replace or disassemble and assemble the transfer roller 1, the lifting seat 30 acts (such as descending), and drives the first swing arm 2 to swing downward through the cooperation of the transmission arm 33 and the like, leaving sufficient operating space above for various operations such as replacing and assembling the transfer roller 1, and disassembly, maintenance, etc. are relatively convenient; of course, the downward swing of the first swing arm 2 can also separate the transfer roller 1 from other structures above, so that the transfer roller 1 can be in an idle state (such as when the machine is stopped); the return action of the lifting seat 30 (such as rising) drives the first swing arm 2 to swing upward through the cooperation of the transmission arm 33 and the like, enabling the transfer roller 1 installed on it to lean against other structures above (such as the plate roller 6, etc.) for printing operations. Among them, after the return action of the lifting seat 30 is in place, the first swing arm 2 also swings upward correspondingly with it. After that, the first rotary clutch eccentric sleeve 35 can be additionally operated to rotate, thereby driving the first swing arm 2 and the transfer roller 1 installed on it to additionally swing up and down within a small range (matching the eccentric range of the eccentric sleeve), to cooperate with the switching between the off-pressure (i.e., disengaging) and on-pressure states during printing operations.

[0043] Driven by the first transmission driving device 3, the first swing arm 2 can not only be driven by the lifting seat 30 to achieve large-stroke and large-range up-and-down swinging. After the first swing arm 2 swings downward in place, sufficient operating space is left above the first swing arm 2 for operations such as replacing and assembling transfer rollers 1 of different sizes. Moreover, the first swing arm 2 can also be additionally operated by the first rotary clutch eccentric sleeve 35 to achieve small-range swinging up and down (when the lifting seat 30 moves (such as rising) in place), to cooperate with the switching between the on-pressure and off-pressure states of the transfer roller 1 during printing operations. Even the pressure during pressing can be adjusted according to printing requirements by operating the rotation angle position of the first rotary clutch eccentric sleeve 35, and the pressing point can be finely adjusted to ensure the pressing pressure state. Among them, the transfer roller 1 will cooperate with the plate roller 6 above for on-pressure and off-pressure. Among them, the up-and-down swinging (arc track) of the first swing arm 2 is driven by the linear up-and-down movement of the lifting seat 30. The lifting operation of the lifting seat 30 is relatively stable, and one end of the first swing arm 2 is not only supported by the first swing support axis, but also additionally supported and driven by the second transmission rotating shaft 32. The swinging operation of the first swing arm 2 is relatively stable.

[0044] It can be further optimized. One end of the first swing arm 2 is connected to the first swing support shaft 20, and the second transmission rotating shaft 32 is located at the other end of the first swing arm 2. The axis of the first swing support shaft 20 is the first swing support axis. The first installation part is located between the first swing support shaft 20 and the second transmission rotating shaft 32. The first swing support shaft 20 is connected to the frame 4; a support structure for both ends of the first swing arm 2 is formed, and the up-and-down swinging operation of the first swing arm 2 is more stable, and the operation of the transfer roller 1 is also relatively stable.

[0045] For example, the first swing arm 2 includes a paired left swing arm 21 and a right swing arm. A roll changing port 22 is provided on the left swing arm 21, and the roll changing port 22 is used to facilitate the axial movement and replacement of the transfer roller 1; a roller body support end cover 23 is provided on the left swing arm 21, and the roller body support end cover 23 is connected to the roll changing port 22. The roller body support end cover 23 is used to support the transfer roller 1 (such as its transfer roller shaft 10) at the roll 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 on the left swing arm 21 and locked by a movable lock block 24.

[0046] Furthermore, for optimization, the first transmission rotating shaft 31 is arranged below the second transmission rotating shaft 32. The first transmission rotating shaft 31 can cooperate to support the second transmission rotating shaft 32 from below, and the structure is relatively more stable. The first swing support shaft 20 is located at the rear side of the second transmission rotating shaft 32, and the lifting seat 30 is located at the front side of the second transmission rotating shaft 32. The spatial structure layout is reasonable and convenient for assembly. The first swing arm 2 is also equipped with a first arc guide rail 41 for swing guiding and supporting; so that the first swing arm 2 swings stably. The arc guide rail can be installed on the frame 4. In addition, the arc guide rail can be arranged at the swinging distal end (i.e., the head) position of the first swing arm 2.

[0047] Among them, the lifting seat 30 can be arranged on the vertical guide rail 37, and the vertical guide rail 37 can be installed on the frame 4, and the lifting seat 30 can then stably lift vertically up and down. The lifting drive device 34 includes a lifting drive motor 341 (such as a servo motor, etc.), a lifting drive lead screw 342, and a lifting drive nut. The lifting drive motor 341 is in transmission connection with the lifting drive lead screw 342, the lifting drive lead screw 342 is in transmission connection with the lifting drive nut, and the lifting drive nut is installed and connected to the lifting seat 30; the lifting drive lead screw 342 is arranged vertically; the lifting drive motor 341 drives the lifting drive nut to lift through the lifting drive lead screw 342, and cooperates to make the lifting seat 30 lift on the vertical guide rail 37; its lifting drive structure operates stably, and can relatively accurately stay at a preset position, and can maintain the position stability and is not easy to loosen after staying, ensuring the printing stability and being able to withstand the pressure during printing impression.

[0048] For example, in the figure, an embodiment of the position setting of the first rotary clutch eccentric sleeve 35: The first rotary clutch eccentric sleeve 35 is sleeved on the first transmission rotating shaft 31. One end of the transmission arm 33 is sleeved on the second transmission rotating shaft 32, and the other end of the transmission arm 33 is sleeved on the first rotary clutch eccentric sleeve 35. That is, the round holes at both ends of the transmission arm 33 are respectively and properly sleeved on the second transmission rotating shaft 32 and the first rotary clutch eccentric sleeve 35 to form a connecting rod transmission structure, wherein the first rotary clutch eccentric sleeve 35 is arranged between the transmission arm 33 and the first transmission rotating shaft 31; in addition, the first rotary driving device 36 includes a first rotary driving cylinder 361, and the first rotary driving cylinder 361 is connected to the lifting seat 30. The first rotary driving 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; furthermore, the first rotary clutch eccentric sleeve 35 has a first connecting swing arm 351, and the first connecting swing arm 351 rotates together with the first rotary clutch eccentric sleeve 35 (which can be an integral structure or a split structure). The first connecting swing arm 351 is in transmission connection with the first rotary driving cylinder 361, and the first rotary driving cylinder 361 cooperates to drive the first connecting swing arm 351 to swing, so as to drive the first rotary clutch eccentric sleeve 35 to rotate (back and forth). In this structure, not only is the transmission reasonable, but also subsequent limit adjustment is convenient.In addition, a first eccentric sleeve rotation limit adjusting device 38 is also connected to the lifting seat 30. The first eccentric sleeve rotation limit adjusting device 38 limits and adjusts the rotation position of the first rotating clutch eccentric sleeve 35 to ensure that the rotation angle position of the first rotating clutch eccentric sleeve 35 is at a position with an appropriate pressing pressure magnitude, and to ensure that the pressing pressure state is in a reasonable state. For example, the first rotary drive cylinder 361 has a first push-pull piston rod 3611. The first cylinder block 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 adjusting device 38 includes a first limit portion 381. The first limit portion 381 is located at the head of the first limit shaft displacement adjusting rod 382 (which can be a lead screw, etc.). The first limit shaft displacement adjusting rod 382 is arranged on the lifting seat 30. By adjusting the position of the first limit shaft displacement adjusting rod 382 (such as a lead screw, etc., which can be rotated and adjusted in position by means of a motor or a handwheel, etc.) on the lifting seat 30, the position of the upper limit portion is adjusted. For example, the axial movement adjustment direction of the first limit shaft displacement adjusting rod 382 is up and down adjustment. When the first push-pull piston rod 3611 drives the first connecting swing arm 351 to rotate in place, the first limit portion 381 blocks (the first connecting swing arm 351) to ensure that the first connecting swing arm 351 reaches the position smoothly. For example, the first rotary drive cylinder 361 and the first limit portion 381 are respectively arranged on the upper and lower sides of the first connecting swing arm 351. For example, the first limit portion 381 is located on the lower side of the first connecting swing arm 351, and the first rotary drive cylinder 361 is located on the upper side of the first connecting swing arm 351. By using the different height positions of the first limit portion 381, the position where the first connecting swing arm 351 is swung downward by the transmission of the first rotary drive cylinder 361 can be blocked and limited. The first push-pull piston rod 3611 of the first rotary drive cylinder 361 can be pushed in place at one time, with relatively high stability. It can limit and adjust the rotation position of the first rotating clutch eccentric sleeve 35 to ensure that the rotation angle position of the first rotating clutch eccentric sleeve 35 is at a position with an appropriate pressing pressure magnitude, and to ensure that the pressing pressure state is in a reasonable state. Other types of first rotary drive devices 36 and eccentric sleeve rotation limit adjusting devices 38 can also be selected. For example, the eccentric sleeve rotation limit adjusting device 38 includes a limit adjusting lead screw on the lifting seat 30.

[0049] In addition, the swing drive structure includes a second transmission drive device 8. The second transmission drive device 8 includes a third transmission rotating shaft 83 and a fourth transmission rotating shaft 84. Among them, the third transmission rotating shaft 83 is connected to the first swing arm 2, and the fourth transmission rotating shaft 84 is connected to the second swing arm 5. The second transmission drive device 8 further includes a distance adjustment device for adjusting the distance between the third transmission rotating shaft 83 and the fourth transmission rotating shaft 84. For example, the distance adjustment device includes a lead screw and nut distance adjustment transmission mechanism 80. The distance between the third transmission rotating shaft 83 and the fourth transmission rotating shaft 84 is adjusted by the lead screw and nut distance adjustment transmission mechanism 80. That is, a lead screw and nut distance adjustment transmission mechanism 80 is configured between the third transmission rotating shaft 83 and the fourth transmission rotating shaft 84. The distance adjustment device (such as the lead screw and nut distance adjustment transmission mechanism 80) can make the third transmission rotating shaft 83 and the fourth transmission rotating shaft 84 approach and separate from each other, so that the second swing arm 5 can swing relative to the first swing arm 2 under the action of the second transmission drive device 8, and even the impression pressure can be adjusted; In addition, a second rotating clutch eccentric sleeve 85 is further provided between the distance adjustment device (such as the lead screw and nut distance adjustment transmission mechanism 80) and the third transmission rotating shaft 83 and / or the fourth transmission rotating shaft 84; it can be set at one place alternatively, or both places can be set; in the embodiment shown in the figure, the second rotating clutch eccentric sleeve 85 is arranged at the position between the fourth transmission rotating shaft 84 and the lead screw and nut distance adjustment transmission mechanism 80. Among them, the second rotating clutch eccentric sleeve 85 is drivingly connected to a corresponding second rotating drive device 86. The second rotating clutch eccentric sleeve 85 is driven to rotate by the cooperation of the second rotating drive device 86, so that the relative position between the lead screw and nut distance adjustment transmission mechanism 80 and the third transmission rotating shaft 83 and / or the fourth transmission rotating shaft 84 can be changed, and the second swing arm 5 and the bottom roller 7 mounted thereon can be swung and lifted in an additional small range (matching the eccentricity range of the eccentric sleeve). The second swing arm 5 can swing in an additional small range relative to the first swing arm 2, and can cooperate with the switching of the impression and release states (with the transfer roller 1) during the printing operation. Among them, the corresponding second rotating drive device 86 is arranged on the first swing arm 2 and / or the corresponding second rotating drive device 86 is arranged on the second swing arm 5. For example, if the second rotating clutch eccentric sleeve 85 is connected to the fourth transmission rotating shaft 84, the corresponding second rotating drive device 86 can be arranged on the second swing arm 5.

[0050] For example, in the figure, it is an embodiment of the installation position of the second rotating clutch eccentric sleeve 85: the second rotating clutch eccentric sleeve 85 is sleeved on the fourth transmission rotating shaft 84, and the lead screw and nut distance adjustment transmission mechanism 80 is sleeved on the second rotating clutch eccentric sleeve 85; in addition, the second rotating drive device 86 includes a second rotating drive cylinder 861. The second rotating drive cylinder 861 is connected to the second swing arm 5. The second rotating drive cylinder 861 rises and swings together with the second swing arm 5 and can drive the second rotating clutch eccentric sleeve 85 to rotate and change the relative position; in addition, The second rotating clutch eccentric sleeve 85 is provided with a second connecting swing arm 851, and the second connecting swing arm 851 rotates together with the second rotating clutch eccentric sleeve 85 (which can be an integrated structure or a split structure), and the second connecting swing arm 851 is transmission-connected with the second rotating drive cylinder 861, and the second rotating drive cylinder 861 cooperates to drive the second connecting swing arm 851 to swing, thereby being able to drive the second rotating clutch eccentric sleeve 85 to rotate (back and forth). This structure not only has reasonable transmission, but also facilitates subsequent limit adjustment. In addition, the second swing arm 5 is also connected to a second eccentric sleeve rotation limit adjustment device 88, which 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 that the pressing pressure state is a reasonable state; for example, 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 hingedly arranged on the second swing arm 5, and the second push-pull piston rod 8611 is hingedly connected to the second connecting swing arm 851, and the second eccentric sleeve rotation limit adjustment device 88 includes a second limit portion 881, and the second limit portion 881 is located at the head of a second limit axis displacement adjustment rod 882 (which can be a screw rod, etc.), and the second limit axis displacement adjustment rod 882 is arranged on the second swing arm 5; by adjusting the second limit axis displacement adjustment rod 882 (such as a screw rod, etc., the rotation adjustment position can be driven by a motor or a hand wheel, etc. ) The position of the second swing arm 5 drives the position adjustment of the upper limiting part, for example, the axial movement adjustment direction of the second limiting axial displacement adjustment rod 882 is front and rear adjustment; when the second push-pull piston rod 8611 drives the second connecting swing arm 851 to rotate into place, the second limiting part 881 blocks (the second connecting swing arm 851) so that the second connecting swing arm 851 can be smoothly put into place; 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, and the different front and rear positions of the second limiting part 881 can be used to support the position of the second connecting swing arm 851 driven by the second rotary drive cylinder 861 to swing back, and the second push-pull piston rod 8611 of the second rotary drive cylinder 861 can be pulled into place with high stability, and the rotation position of the second rotary clutch eccentric sleeve 85 can be limited and adjusted to ensure that the rotation angle position of the second rotary clutch eccentric sleeve 85 is a position with a suitable pressing pressure size, and ensure that the pressing pressure state is a reasonable state.

[0051] For example, the lead screw and nut distance adjustment drive mechanism 80 includes a lead screw support base 801, a drive lead screw 802, and a drive nut 803. The drive lead screw 802 is disposed on the lead screw support base 801, and the drive lead screw 802 is in driving connection with the drive nut 803 through cooperation; one of the lead screw support base 801 and the drive nut 803 is connected to the first swing arm 2 through a third transmission rotating shaft 83, and the other is connected to the second swing arm 5 through a fourth transmission rotating shaft 84. The drive lead screw 802 on the lead screw support base 801 can be driven to rotate or move axially in cooperation with a hand wheel or a motor, etc.

[0052] For another example, one end of the second swing arm 5 is connected to the second swing support shaft 50, the fourth transmission rotating shaft 84 is located at the other end of the second swing arm 5, the axis of the second support is the second swing support axis, and the second mounting portion is located between the second swing support shaft 50 and the fourth transmission rotating shaft 84. The second swing support shaft 50 is connected to the frame 4; the second swing support shaft 50 is located at the rear side of the fourth transmission rotating shaft 84, and the second swing arm 5 is further provided with a second arc-shaped guide rail 42 for swing guiding support; the second swing support axis is disposed below the first swing support axis, and the second swing support axis is disposed at the rear side of the first swing support axis.

Claims

1. The offset printing device with double swing arms, comprising a plate cylinder shaft, a first swing arm (2) and a second swing arm (5), The plate cylinder shaft is provided with a detachable and replaceable plate cylinder (6), The first swing arm (2) is provided with a transfer roller shaft, and the transfer roller shaft (10) is provided with a detachable and replaceable transfer roller cylinder (1), The diameters of the plate cylinder and the transfer roller cylinder are matched, The second swing arm (5) is provided with a bottom roller (7), The first swing arm (2) is connected to the first swing support shaft (20). The first swing arm (2) is provided with a first installation part for installing the transfer roller shaft (10). The first swing support shaft (20) is located at the rear side of the first installation part. The center distance between the transfer roller shaft (10) and the first swing support shaft (20) is the first distance R1. The second swing arm (5) is connected to the second swing support shaft (50). The second swing arm (5) is provided with a second installation part for installing the bottom roller. The second swing support shaft (50) is located at the rear side of the second installation part. The center distance between the bottom roller (7) and the second swing support shaft (50) is the second distance R2. It is characterized in that: Taking the axis point (60) of the plate cylinder shaft as an end point, and making a ray L downward and forward by an angle β, Using plate cylinders (6) with three outer diameter specifications of large, medium and small to determine the planned running axis points corresponding to three outer diameter specifications of large, medium and small transfer roller cylinders (1) which are a, b, c respectively, and making a, b, c be on the ray L. The area of a, b, c on the ray L forms a line segment D. Making the perpendicular bisector M of the line segment D, and the swing support axis position o1 point of the first swing support shaft (20) is located on the perpendicular bisector M. Taking o1 point as the center and R1 as the radius to make an arc C1, and making the planned running axis points a, c be located outside the arc C1, and the planned running axis point b be located inside the arc C1; The straight lines connecting o1 point with the planned running axis points a, b, c respectively intersect the arc C1 at points a′, b′, c′. Respectively taking points a′, b′, c′ vertically downward and respectively taking the sum of the radius of the corresponding specification transfer roller cylinder (1) and the radius of the bottom roller (7) as the distance to correspondingly determine the planned running axis points of the bottom roller as d, e, f respectively; Taking the planned running axis points d, e, f of the bottom roller (7) to determine an arc C2, and determining the center of the arc C2 as the planned running swing support axis position o2 point of the second swing support shaft (50); or, taking a radius R2 to make an arc C2′, and making the planned running axis points d, f be located outside the arc C2′, and the planned running axis point e be located inside the arc C2′, and determining the center of the arc C2′ as the swing support axis position o2′ point of the second swing support shaft (50), and the o2′ point falls on the connection line between o2 point and the planned running axis point e or the o2′ point falls on the perpendicular bisector of the chord length corresponding to the arc C2.

2. The offset printing device with a double swing arm according to claim 1, characterized in that: 500 mm ≥ R1 ≥ 300 mm; 30° ≥ β ≥ 20°; 600 mm ≥ R2 ≥ 350 mm; The outer diameter specification of the bottom roller is 120 - 160 mm; The outer diameter specifications of the large, medium and small plate cylinders are respectively selected as the maximum size, the medium size and the minimum size preset at the factory.

3. The offset printing device with a double swing arm according to claim 2, characterized in that: The length of R1 is set to 350 mm, the angle of β is set to 25 degrees, and the length of R2 is set to 400 mm; The outer diameters of the large, medium and small plate rollers are 220 mm, 170 mm and 120 mm respectively. The outer diameter of the bottom roller is set to 145 mm.

4. The offset printing device with a double swing arm as claimed in claim 1, characterized in that: The plate roller shaft is installed on the frame, the first swing support shaft is installed on the frame, and the second swing support shaft is installed on the frame; The radius of the arc C1 is R1, and the radius of the arc C2 or the arc C2' is R2.

5. The offset printing device with a double swing arm as claimed in claim 1, characterized in that: A plate roller station is arranged above the first mounting part, and the plate roller shaft is arranged at the plate roller station. The second mounting part is arranged below the first mounting part, and the first swing support shaft and the second swing support shaft are both arranged horizontally left and right.

6. The offset printing device with a double swing arm as claimed in claim 1, wherein: It also includes a swing drive structure, and the first swing arm (2) and the second swing arm (5) are transmission-connected to the swing drive structure.

7. The double swing arm offset printing device according to claim 6, characterized in that: The swing drive structure comprises a first transmission drive device (3), the first transmission drive device (3) comprising a lifting seat (30), a lifting drive device (34), a first transmission rotating shaft (31), a second transmission rotating shaft (32), a transmission arm (33) and a first rotary clutch eccentric sleeve (35). The lifting seat (30) is drivingly connected to the lifting drive device (34). The first transmission shaft (31) is arranged on the lifting seat (30). The second transmission shaft (32) is arranged on the first swing 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 further provided between the transmission arm (33) and the first transmission shaft (31) and / or the second transmission shaft (32). The first rotary clutch eccentric sleeve (35) is transmission-connected to a corresponding first rotary drive device (36). The corresponding first rotary drive device (36) is arranged on the lifting seat (30) and / or the corresponding first rotary drive device (36) is arranged on the first swing arm (2).

8. The double swing arm offset printing device according to claim 6, characterized in that: One end of the first swing arm (2) is connected to the first swing support shaft (20), the second transmission shaft (32) is located at the other end of the first swing arm (2), the first mounting portion is located between the first swing support shaft (20) and the second transmission shaft (32), and the first swing support shaft (20) is connected to the frame (4); The first swing arm (2) comprises a paired left swing arm (21) and a right swing arm, the left swing arm (21) is provided with a roll changing opening (22), the left swing arm (21) is provided with a roll body supporting end cover (23), and the roll body supporting end cover (23) is connected to the roll changing opening (22); The first transmission shaft (31) is arranged below the second transmission shaft (32), the first swing support shaft (20) is located at the rear side of the second transmission shaft (32), the lifting seat (30) is located at the front side of the second transmission shaft (32), and the first swing arm (2) is further provided with a first arc-shaped guide rail (41) for swing guide support; The lifting seat (30) is arranged on the vertical guide rail (37), and the vertical guide rail (37) is arranged on the machine frame. The lifting drive device (34) includes a lifting drive motor (341), a lifting drive lead screw (342) and a lifting drive nut. The lifting drive motor (341) is in transmission connection with the lifting drive lead screw (342), and the lifting drive lead screw (342) is in transmission connection with the lifting drive nut; the lifting drive nut is installed and connected to the lifting seat (30); the lifting drive lead screw (342) is arranged vertically. A first rotating clutch eccentric sleeve (35) is sleeved on the first transmission rotating shaft (31). One end of the transmission arm (33) is sleeved on the second transmission rotating shaft (32). The other end of the transmission arm (33) is sleeved on the first rotating clutch eccentric sleeve (35). The first rotation drive device (36) includes a first rotation drive cylinder (361), and the first rotation drive cylinder (361) is connected to the lifting seat (30). The first rotating clutch eccentric sleeve (35) is provided with a first connecting swing arm (351), and the first connecting swing arm (351) is in transmission connection with the first rotation drive cylinder (361). A first eccentric sleeve rotation limit adjusting device (38) is also connected to the lifting seat (30). The first rotation drive cylinder (361) has a first push-pull piston rod (3611). The first cylinder body (3612) of the first rotation drive cylinder (361) is hinged to 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 adjusting device (38) includes a first limiting part (381). The first limiting part (381) is located at the head of the first limit shaft displacement adjusting rod (382), and the first limit shaft displacement adjusting rod (382) is arranged on the lifting seat (30).

9. The offset printing device with double swing arms according to claim 1, characterized in that: The swing drive structure includes a second transmission drive device (8). The second transmission drive device (8) includes a third transmission rotating shaft (83) and a fourth transmission rotating shaft (84). The third transmission rotating shaft (83) is connected to the first swing arm (2), and the fourth transmission rotating shaft (84) is connected to the second swing arm (5). The second transmission drive device (8) further includes a distance adjusting device for adjusting the distance between the third transmission rotating shaft (83) and the fourth transmission rotating shaft (84). The distance adjusting device includes a lead screw and nut distance adjusting transmission mechanism (80). A lead screw and nut distance adjusting transmission mechanism (80) is connected and arranged between the third transmission rotating shaft (83) and the fourth transmission rotating shaft (84). A second rotating clutch eccentric sleeve (85) is further provided between the lead screw and nut distance adjusting transmission mechanism (80) and the third transmission rotating shaft (83) and / or the fourth transmission rotating shaft (84). The second rotating clutch eccentric sleeve (85) is in transmission connection with a corresponding second rotation drive device (86). The corresponding second rotation drive device (86) is arranged on the first swing arm (2) and / or the corresponding second rotation drive device (86) is arranged on the second swing arm (5).

10. The offset printing device with double swing arms according to claim 9, characterized in that: A second rotary clutch eccentric sleeve (85) is sleeved on the fourth transmission rotating shaft (84). A lead screw and nut distance 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), and the second rotary drive cylinder (861) is connected to the second swing arm (5). The second rotary clutch eccentric sleeve (85) is provided with a second connecting swing arm (851), and the second connecting swing arm (851) is in transmission connection with the second rotary drive cylinder (861). A second eccentric sleeve rotation limit adjustment device (88) is further connected to the second swing arm (5). The second rotary drive cylinder (861) has a second push-pull piston rod (8611). The second cylinder block (8612) of the second rotary drive cylinder (861) is hinged to the second swing arm (5), and 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). The second limit part (881) is located at the head of the second limit shaft displacement adjustment rod (882), and the second limit shaft displacement adjustment rod (882) is arranged on the second swing arm (5). The lead screw and nut distance adjustment transmission mechanism (80) includes a lead screw support seat (801), a transmission lead screw (802) and a transmission nut (803). The transmission lead screw (802) is arranged on the lead screw support seat (801), and the transmission lead screw (802) is in cooperative transmission connection with the transmission nut (803). One of the lead screw support seat (801) and the transmission nut (803) is connected to the first swing arm (2) through a third transmission rotating shaft (83), and the other is connected to the second swing arm (5) through the second rotary clutch eccentric sleeve (85) and the fourth transmission rotating shaft (84). One end of the second swing arm (5) is connected to the second swing support shaft (50). The fourth transmission rotating shaft (84) is located at the other end of the second swing arm (5). The second installation part is located between the second swing support shaft (50) and the fourth transmission rotating shaft (84). The second swing support shaft (50) is connected to the frame (4). The second swing support shaft (50) is located behind the fourth transmission rotating shaft (84). The second swing arm (5) is further equipped with a second arc-shaped guide rail (42) for swing guiding and supporting. The second swing support shaft is arranged below the first swing support shaft. The second swing support shaft is arranged behind the first swing support shaft.

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