Double-swing-arm type offset printing device

Abstract

The utility model 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, the center distance between the transfer printing roller shaft and a first swing support shaft of the first swing arm is a first distance R1, and the center distance between the transfer printing roller shaft and the second swing support shaft of the first swing arm is a second 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

[0001] The utility model relates to printing equipment, especially printing equipment in offset printing device. BACKGROUND

[0002] The offset printing device has a plate roller, a transfer roller and a bottom roller (i.e. an impression roller) cooperating with offset printing work, and the pattern (i.e. a printing unit) on the plate roller is offset printed on the printing material (such as continuous paper and the like), in order to adapt to printing units of different length sizes, the corresponding diameter specifications of the plate roller need to be replaced, and the transfer roller also needs to be replaced accordingly, and the diameter specifications of the transfer roller and the plate roller are usually matched (e.g. consistent within an error range), wherein the plate roller and the transfer roller need to maintain a pressing state during normal printing operation, and the transfer roller and the bottom roller also need to maintain a pressing state. The plate roller and the transfer roller of different diameter specifications need to be replaced, and after replacement, the pressing position of the transfer roller and the bottom roller changes, the pressing pressure changes, and the feeding position of the printing material changes, and these changes will affect the printing quality of the printing material. SUMMARY

[0003] In view of the technical problems in the background art, the technical problems solved by the utility model are to provide a double-swing-arm offset printing device, wherein after the corresponding roller specifications are replaced, the pressing position of the transfer roller and the bottom roller can still ensure the printing quality effect.

[0004] The utility model discloses a double swing arm formula's offset printing device, including version roll axle, first swing arm and second swing arm, be equipped with dismounting and replacing formula's version roll cylinder on version roll axle, be equipped with transfer roll axle on first swing arm, be equipped with dismounting and replacing formula's transfer roll cylinder on transfer roll axle, and the diameter size of version roll cylinder and transfer roll cylinder is matched, be equipped with bottom roll on second swing arm, first swing arm is connected in first swing support axle, be equipped with first installation department for transfer roll axle installation on first swing arm, and first swing support axle is located first installation department's rear side, and the center distance between transfer roll axle and first swing support axle is first interval R1, second swing arm is connected in second swing support axle, be equipped with second installation department for bottom roll installation on second swing arm, and second swing support axle is located second installation department's rear side, and the center distance between bottom roll and second swing support axle is second interval R2, its characterized in that: with version roll axle's axis point as end point, and make the ray L with downwardly and forwardly beta angle, with three outer diameter specifications of big, medium and small version roll cylinder determine the corresponding plan running axle center point of three outer diameter specifications of big, medium and small transfer roll cylinder respectively a, b, c, and make a, b, c be on the ray L, and the region of a, b, c on the ray L forms the line segment D, and make the midline M of line segment D, and the swing support axle center position o1 point of first swing support axle is on the midline M, with o1 point as center, with R1 as radius to make the circular arc C1, and make plan running axle center point a, c be on the outside of circular arc C1, and plan running axle center point b be on the inside of circular arc C1, and o1 point respectively with plan running axle center point a, b, c be connected the straight line intersection circular arc C1 at point a', b', c', respectively with point a', b', c' vertical downward and respectively with the radius of corresponding specification's transfer roll cylinder and the radius of bottom roll sum distance corresponding to determine the plan running axle center point of bottom roll respectively d, e, f, with the plan running axle center point of bottom roll d, e, f determine circular arc C2, and the center of circular arc C2 determines the plan running swing support axle center position o2 point of second swing support axle, or, with radius R2 to make circular arc C2', and make plan running axle center point d, f be on the outside of circular arc C2', and plan running axle center point e be on the inside of circular arc C2', and the center of circular arc C2' determines the swing support axle center position o2' point of second swing support axle, and o2' point falls on the line of o2 point and plan running axle center point e or o2' point falls on the midline of the chord length corresponding to circular arc C2.

[0005] Various optimizations or supplementary descriptions can be made on the above technical solutions.

[0006] For example, 500mm >= R1 >= 300mm; 30 degrees >= beta >= 20 degrees; 600mm >= R2 >= 350mm; the outer diameter specification of the bottom roll is 120-160mm; the outer diameter specifications of the large, medium and small version roll cylinders are respectively the maximum size, the middle size and the minimum size preset by the factory.

[0007] For example, the length of R1 is set as 350 mm, the angle of β is set as 25 degrees, and the length of R2 is set as 400 mm; the outer diameter specifications of the three rollers are respectively 220 mm, 170 mm, and 120 mm, and the outer diameter specification of the bottom roller is set as 145 mm.

[0008] The first swing support shaft is installed on the rack, and the second swing support shaft is installed on the rack; the radius of the arc C1 is R1, and the radius of the arc C2 or the arc C2' is R2.

[0009] For example, the plate roller station is arranged above the first mounting portion, the plate roller shaft is arranged in the plate roller station, the second mounting portion is arranged below the first mounting portion, and the first swing support shaft and the second swing support shaft are both arranged horizontally.

[0010] The swing driving structure, the first swing arm, and the second swing arm are drivingly connected.

[0011] For example, the swing driving structure includes a first transmission driving device, the first transmission driving device includes a lifting seat, a lifting driving device, a first transmission shaft, a second transmission shaft, a transmission arm, and a first rotation clutch eccentric sleeve, the lifting seat is drivingly connected with the lifting driving 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 with the first transmission shaft, and the other end of the transmission arm is connected with the second transmission shaft; the first rotation clutch eccentric sleeve is further arranged between the transmission arm and the first transmission shaft and / or the second transmission shaft, the first rotation clutch eccentric sleeve is drivingly connected with a corresponding first rotation driving device, and the corresponding first rotation driving device is arranged on the lifting seat and / or the corresponding first rotation driving device is arranged on the first swing arm.

[0012] Further optimization, one end of the first swing arm is connected to the first swing support shaft, the second transmission 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 shaft, and the first swing support shaft is connected to the rack; the first swing arm includes a pair of left and right swing arms, the left swing arm is provided with a roll changing opening, the left swing arm is provided with a roll body support end cover, and the roll body support end cover is connected to the roll changing opening; the first transmission shaft is arranged below the second transmission shaft, the first swing support shaft is located at the rear side of the second transmission shaft, the lifting seat is located at the front side of the second transmission shaft, and the first swing arm is further provided with a first arc-shaped guide rail for swing guide support; the lifting seat is arranged on the vertical guide rail, the vertical guide rail is arranged on the rack, and the lifting drive device includes a lifting drive motor, a lifting drive screw and a lifting drive nut, the lifting drive motor is in transmission connection with the lifting drive screw, and the lifting drive 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 screw is vertically arranged; the first transmission shaft is sleeved with a first rotary clutch eccentric sleeve, one end of the transmission arm is sleeved on the second transmission shaft, the other end of the transmission arm is sleeved on the first rotary clutch eccentric sleeve, the first rotary drive device includes a first rotary drive cylinder, the first rotary drive cylinder is connected to the lifting seat, the first rotary clutch eccentric sleeve has a first connecting swing arm, and the first connecting swing arm is in transmission connection with the first rotary drive cylinder; the lifting seat is further connected with a first eccentric sleeve rotation limiting adjustment device; the first rotary drive cylinder has a first push-pull piston rod, a first cylinder body of the first rotary drive cylinder is hingedly arranged on the lifting seat, the first push-pull piston rod is hinged to the first connecting swing arm, and the first eccentric sleeve rotation limiting adjustment device includes a first limiting part, the first limiting part is located at the head of the first limiting shaft displacement adjusting rod, and the first limiting shaft displacement adjusting rod is arranged on the lifting seat.

[0013] For example, the swing drive structure includes a second transmission drive device, the second transmission drive device includes a third transmission shaft and a fourth transmission shaft, the third transmission shaft is connected to the first swing arm, the fourth transmission shaft is connected to the second swing arm, and the second transmission drive device further includes a pitch adjusting device for adjusting the distance between the third transmission shaft and the fourth transmission shaft, the pitch adjusting device includes a screw nut pitch adjusting transmission mechanism, and the screw nut pitch adjusting transmission mechanism is connected and arranged between the third transmission shaft and the fourth transmission shaft; the second rotary clutch eccentric sleeve is further provided between the screw nut pitch adjusting transmission mechanism and the third transmission shaft and / or the fourth transmission shaft, the second rotary clutch eccentric sleeve is in transmission connection with the corresponding second rotary drive device, and the corresponding second rotary drive device is arranged on the first swing arm and / or the corresponding second rotary drive device is arranged on the second swing arm.

[0014] The second rotation driving device comprises a second rotation driving cylinder connected to the second swing arm, and the second rotation clutch eccentric sleeve is provided with a second connecting swing arm in transmission connection with the second rotation driving cylinder; the second swing arm is further connected with a second eccentric sleeve rotation limiting adjustment device, the second rotation driving cylinder has a second push-pull piston rod, and a second cylinder body of the second rotation driving cylinder is hingedly arranged on the second swing arm, the second push-pull piston rod is hingedly connected with the second connecting swing arm, and the second eccentric sleeve rotation limiting adjustment device comprises a second limiting part located at a head of a second limiting shaft adjustment rod arranged on the second swing arm; the screw rod and nut distance adjustment transmission mechanism comprises a screw rod support seat, a transmission screw rod and a transmission screw nut, the transmission screw rod is arranged on the screw rod support seat, and the transmission screw rod and the transmission screw nut are in transmission connection; one of the screw rod support seat and the transmission screw nut is connected to the first swing arm through a third transmission rotating shaft, and the other is connected to the second swing arm through the second rotation clutch eccentric sleeve and a fourth transmission rotating shaft; one end of the second swing arm is connected to a second swing support shaft, the fourth transmission rotating shaft is located at the other end of the second swing arm, a second mounting 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 rack; the second swing support shaft is located at the rear side of the fourth transmission rotating shaft, and the second swing arm is further provided with a second arc-shaped guide rail for swing guide support; the second swing support shaft is arranged below the first swing support shaft and at the rear side of the first swing support shaft.

[0015] The beneficial effects of the double-swing-arm type offset printing device are as follows: in the structure of the double-swing-arm type offset printing device, the overall structure is reasonably arranged through the double-swing-arm type structure (including the first swing arm and the second swing arm) and the setting of the corresponding swing support shaft center positions (i.e., o1 point, o2 point or o2' point), so that the device can still be smoothly and stably combined and pressed after replacing the plate cylinder and the transfer cylinder of different diameter specifications (i.e., changing the plate diameter), especially the transfer cylinder and the bottom roller, and the center of the transfer cylinder and the center of the bottom roller are always close to the vertical line, with a very small deviation, so that the combined pressure value of the transfer cylinder and the bottom roller is close to unchanged under different diameter specifications (i.e., different plate diameters), and only the combined pressure value needs to be slightly adjusted after changing the plate, or even the combined pressure value does not need to be adjusted; when the diameter of the plate roller and the transfer cylinder changes, the combined pressure of 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, the printing pressure is the same, the printing quality is consistent, and the printing quality effect is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0016] The relevant details and working principles of the embodiments of the present application will be described below in combination with the drawings.

[0017] Figure 1 It is a structure principle schematic view in the utility model.

[0018] Figure 2 It is a structure position cooperation relation view of the first and second swing support shafts in the utility model.

[0019] Figure 3 It is a structure view based on Figure 1 in the utility model.

[0020] Figure 4 It is Figure 3 another annotation view.

[0021] Figure 5 It is Figure 4 the sectional view of A-A.

[0022] In the figure:

[0023] 1, transfer roll; 10, transfer roll shaft;

[0024] 2, first swing arm; 20, first swing support shaft; 21, left swing arm; 22, roll changing port; 23, roll body support end cover; 24, movable lock block;

[0025] 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 rotary clutch eccentric sleeve; 36, first rotary driving device; 37, vertical guide rail; 38, first eccentric sleeve rotary limit adjusting device;

[0026] 341, lifting driving motor; 342, lifting driving screw;

[0027] 351, first connecting swing arm;

[0028] 361, first rotary driving cylinder; 3611, first push-pull piston rod; 3612, first cylinder body;

[0029] 381, first limit part; 382, first limit shaft displacement adjusting rod;

[0030] 4, rack; 41, first arc-shaped guide rail; 42, second arc-shaped guide rail;

[0031] 5, second swing arm; 50, second swing support shaft;

[0032] 6, plate roll; 60, axis point position of plate roll shaft;

[0033] 7, bottom roll;

[0034] 8, second transmission driving device; 80, screw nut distance adjustment transmission mechanism; 83, third transmission rotating shaft; 84, fourth transmission rotating shaft; 85, second rotary clutch eccentric sleeve; 86, second rotary driving device; 88, second eccentric sleeve rotary limit adjustment device;

[0035] 801, screw rod support seat; 802, transmission screw rod; 803, transmission screw nut;

[0036] 851, second connecting swing arm;

[0037] 861, second rotary driving cylinder; 8611, second push-pull piston rod; 8612, second cylinder body;

[0038] 881, second limit part; 882, second limit shaft displacement adjustment lever. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.

[0040] Referring to the drawings, the double-swing-arm type offset printing device in the embodiments of the present embodiment comprises a plate roller shaft and a transfer roller shaft, a detachable and replaceable plate roller cylinder is arranged on the plate roller shaft, a detachable and replaceable transfer roller cylinder is arranged on the transfer roller shaft, the diameter of the plate roller cylinder matches that of the transfer roller cylinder, and different printing unit (length) requirements can be met by replacing the size specifications, which is mature technology and will not be described again.

[0041] The double-swing-arm type offset printing device further comprises 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 a first swing support shaft, that is, the first swing support shaft swings and supports the first swing arm, a first mounting part for mounting the transfer roller shaft is arranged on the first swing arm, the first swing support shaft is located at the rear side of the first mounting part, the center distance between the transfer roller shaft and the first swing support shaft is a first distance R1, that is, the swing radius of the transfer roller shaft is R1; wherein the second swing arm is connected to a second swing support shaft, that is, the second swing support shaft swings and supports the second swing arm, a second mounting part for mounting the bottom roller is arranged on the second swing arm, the second swing support shaft is located at the rear side of the second mounting part, the center distance between the bottom roller and the second swing support shaft is a second distance R2, that is, the swing radius of the bottom roller is R2.

[0042] The swing support shaft center position (i.e. the swing center of the first swing arm) of the first swing arm in the double swing arm type offset printing device will adopt the following structure: taking the axis point position 60 of the plate roller shaft as the end point, and making a ray L downward and forward by an angle β, and using the large, medium and small three outer diameter specifications of the plate roller cylinder (for example, the maximum size, the medium size (which can be directly taken as the middle value of the maximum and minimum) and the minimum size of the plate roller cylinder preset in the device) to determine the corresponding planned running axis point positions a, b and c of the matched (paired) large, medium and small three outer diameter specifications of the transfer roller cylinder, the transfer roller cylinder can cooperate with the matched plate roller cylinder to smoothly transfer on the corresponding planned running axis point position of the transfer roller shaft, the planned running axis point position is the point position designed for normal printing work of the transfer roller cylinder on the transfer roller shaft, and a, b and c are on the ray L, and the area of these points a, b and c on the ray L can form a line segment D; the midline M of the line segment D is made, and the swing support shaft center position o1 point of the first swing support shaft is located on the midline M, i.e. the swing support shaft center position o1 point of the first swing support shaft is set on the midline M, and then the position of the swing support shaft center position o1 point is set according to the size of R1 (i.e. the swing radius of the transfer roller shaft is R1), i.e. the position of the first swing support shaft is set, wherein in order to make the position of the o1 point in the device more reasonable, a circular arc C1 is made with the o1 point as the center (i.e. the center of the circle) and R1 as the radius, and the planned running axis point positions a and c are located on the outside of the circular arc C1, and the planned running axis point position b is located on the inside of the circular arc C1, so that in the process of swing adjustment position of the first swing arm, the actual point position of the transfer roller cylinder on the transfer roller shaft and its planned running axis point position have little deviation, which is within an acceptable range and does not affect the printing quality effect, and theoretically the larger the R1 value is, the more ideal it is, and the smaller the deviation is.

[0043] The second swing support shaft of the second swing arm is determined by the following structure: the straight line connecting the point o1 and the planned running shaft center point a, b, c intersects the circular arc C1 at the point a', b', c', and the radius of the transfer roller corresponding to the corresponding specification (referring to the large, medium and small three outer diameter specifications) is vertically downward at the point a', b', c', and the sum of the radius of the transfer roller and the radius of the bottom roller is the distance corresponding to the planned running shaft center point d, e, f of the bottom roller. The planned running shaft center point is the point designed for the normal printing work of the bottom roller. The circular arc C2 is determined by the planned running shaft center points d, e, f of the bottom roller, and the center of the circular arc C2 is determined as the planned running swing support shaft center position o2 of the second swing support shaft. In this way, during the swing adjustment of the second swing arm, the deviation of the actual point position of the bottom roller from the planned running shaft center point d, e, f is small, and the relative accuracy is relatively high, which is within an acceptable range. Alternatively, the swing center position of the second swing arm can be determined by the following structure: a circular arc C2' with a radius R2 is drawn, and the planned running shaft center points d, f are located outside the circular arc C2', and the planned running shaft center point e is located inside the circular arc C2'. The center of the circular arc C2' is determined as the swing support shaft center position o2' of the second swing support shaft. The o2' point falls on the line connecting the o2 point and the planned running shaft center point e, or the o2' point falls on the perpendicular line of the corresponding chord length of the circular arc C2. In this structure, compared to the position of the o2 point, the radius R2 corresponding to the o2' point is relatively short (compared to the radius R2 corresponding to the o2 point). Under the premise that the deviation of the actual point position of the bottom roller from the planned running shaft center point is small, the entire machine structure will not be too large due to the large size of the equipment caused by the large R2. The equipment using the o2' point structure has a relatively small size, and the entire printing equipment (unit) is avoided to be too long.

[0044] The running refers to the normal printing work of mutual compression. When determining the positions of o1 point, o2 point or o2' point, especially the positions of o2 point or o2' point, it is ensured that the center of the transfer roller and the center of the bottom roller are always close to the vertical straight line, with a small deviation, and the front and back position deviation t value of the running shaft center point (i.e. the center point) of the bottom roller is less than or equal to 1mm.

[0045] The double swing arm type structure of the printing device is reasonable in layout, and after the different diameter specifications of the plate roller and the transfer roller are replaced, stable and smooth pressure combination can be achieved, especially the stable and smooth pressure combination between the transfer roller and the bottom roller, and the center of the transfer roller and the center of the bottom roller are always close to the vertical line with a small deviation, so that the pressure value of the transfer roller and the bottom roller is close to unchanged, and only a small adjustment of the pressure value is needed after the plate is replaced. When the diameter of the plate roller and the transfer roller is changed, the pressure of the transfer roller and the bottom roller is close to the vertical direction, and the printing material (continuous material) between the transfer roller and the bottom roller is almost in a horizontal state, the printing pressure is the same, the printing quality is guaranteed.

[0046] The following optimizations or further descriptions can be made based on the above embodiments.

[0047] The value of R1 and the angle of β can be set according to the requirements, but are limited by the size of the whole machine and other conditions, and are set to the following adaptive range: 500mm≥R1≥300mm; 30°≥β≥20°, 600mm≥R2≥350mm; it is more reasonable and can meet the requirements. For example, the length of R1 is set to 350mm, the angle of β is set to 25°, and the length of R2 is set to 400mm.

[0048] In addition, the outer diameter specifications of the large, medium and small plate rollers can be set to 220mm, 170mm and 120mm respectively, and the outer diameter specification of the bottom roller is 120-160mm. The outer diameter specification of the bottom roller can be set to 145mm with an error offset of T less than or equal to 1mm.

[0049] The plate roller shaft is installed on the rack, the first swing support shaft is installed on the rack, and the second swing support shaft is installed on the rack. The radius of the arc C1 is R1, which is the first distance, and the radius of the arc C2 or the arc C2' is R2, which is the second distance.

[0050] In addition, in order to facilitate the swing adjustment position of the first swing arm and the second swing arm, the switching of the pressure combination and the pressure separation state, and even the pressure combination pressure size adjustment, the following optimization can be made.

[0051] The plate roller station is arranged above the first mounting part, the plate roller shaft is arranged at the plate roller station, and when the transfer roller 1 assembled at the first mounting part is lifted or lowered with the first swing arm 2, the transfer roller 1 can be pressed and separated (i.e. disengaged) with the plate roller 6 at the plate roller station. The second mounting part is arranged below the first mounting part, and when the bottom roller 7 (i.e. the impression roller) assembled at the second mounting part is lifted or lowered with the second swing arm 5, the bottom roller 7 can be pressed and separated (i.e. disengaged) with the transfer roller 1 at the first mounting part. The first swing support shaft and the second swing support shaft are arranged horizontally.

[0052] The double-lifting swing arm structure can be used to assemble the transfer roller 1 and the bottom roller 7, and the corresponding transfer roller 1 and bottom roller 7 are lifted and lowered by swing lifting, and can be separated by the corresponding swing arm (first swing arm 2, second swing arm 5) to provide a larger operation space for assembly. The double-lifting swing arm structure occupies a relatively compact space, and the disassembly and assembly of each roller (transfer roller 1, bottom roller 7, and even plate roller 6) is convenient, and different sizes of transfer roller 1 and other assemblies can be assembled. The corresponding swing arm (first swing arm 2, second swing arm 5) is supported and swings stably, the first swing arm 2 and the second swing arm 5 act in turn when pressed and separated, the pressing force of each roller between the plate roller 6 and the transfer roller 1 and between the transfer roller 1 and the bottom roller 7 is adjusted, and the pressing force is not easily interfered with each other, and the pressing force is upwardly lifted and not easily conflicted.

[0053] The following optimizations or further descriptions can be made based on the above embodiments.

[0054] For example, the offset printing mechanism of the double-lifting swing arm type further includes a swing driving structure, and the first swing arm 2 and the second swing arm 5 are drivingly connected to the swing driving structure. That is, the first swing arm 2 and the second swing arm 5 are driven to be lifted and lowered to realize the lifting and lowering of the transfer roller 1 or the bottom roller 7 assembled thereon. The swing driving structure has various forms, for example, a cylinder or a motor is used to drive the lifting and lowering.

[0055] The following optimization scheme is used in this embodiment,

[0056] The swing driving structure comprises a first transmission driving device 3, which comprises a lifting seat 30, a lifting driving 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 in transmission connection with the lifting driving device 34. The first transmission rotating shaft 31 is arranged on the lifting seat 30 and driven by the lifting driving 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 moves up and down together with the second transmission rotating shaft 32. One end of the transmission arm 33 is connected with the first transmission rotating shaft 31, and the other end of the transmission arm 33 is connected with 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 together 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-pull), so that the first swing arm 2 moves up and down around the first swing supporting shaft 20.

[0057] 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 clutch eccentric sleeve 35 is in transmission connection with a corresponding rotary driving device. The first rotary clutch eccentric sleeve 35 is driven by the first rotary driving device 36 to rotate, so as 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, realize the swing and lifting of the first swing arm 2 and the transfer roller 1 in a small range (matching the eccentric range of the eccentric sleeve), and switch the pressing and separation state of the printing operation (with the plate roller 6). The corresponding first rotary driving device 36 is arranged on the lifting seat 30 and / or the corresponding first rotary driving device 36 is arranged on the first swing arm 2. For example, the first rotary clutch eccentric sleeve 35 is connected with the first transmission rotating shaft 31, and the corresponding first rotary driving device 36 is arranged on the lifting seat 30. For another example, the first rotary clutch eccentric sleeve 35 is connected with the second transmission rotating shaft 32, and the corresponding first rotary driving device 36 is arranged on the first swing arm 2.

[0058] When the transfer roller 1 needs to be replaced and disassembled, the lifting seat 30 is actuated (e.g., lowered) to drive the first swing arm 2 to swing downward through the transmission arm 33, etc. to leave sufficient operating space above the first swing arm 2 to facilitate the replacement and assembly of the transfer roller 1 and other operations such as disassembly, maintenance, etc. The downward swing of the first swing arm 2 can also separate the transfer roller 1 from other structures above to allow the transfer roller 1 to be in an idle state (e.g., when the machine is stopped). The upward movement of the lifting seat 30 can drive the first swing arm 2 to swing upward through the transmission arm 33, etc. to allow the transfer roller 1 installed thereon to move towards other structures above (e.g., the plate roller 6) for printing operations. When the lifting seat 30 is in place, the first swing arm 2 also swings upward to the corresponding position. Thereafter, the first swing arm 2 and the transfer roller 1 installed thereon can be additionally swung and lifted in a small range (matching the eccentric range of the eccentric sleeve) by additionally rotating the first rotating clutch eccentric sleeve 35 to switch between the pressure-off (i.e., disengaged) and pressure-on states in the printing operation.

[0059] The first swing arm 2 can be driven by the first transmission drive 3 to not only be lifted and lowered by the lifting seat 30 to swing in a large range, but also be additionally swung and lifted in a small range by the first rotating clutch eccentric sleeve 35 to switch between the pressure-on and pressure-off states of the transfer roller 1 in the printing operation. The rotation angle of the first rotating clutch eccentric sleeve 35 can be adjusted to adjust the pressure during pressure-on, fine-tune the pressure-on point, and ensure the pressure-on state. The transfer roller 1 will be in pressure-on and pressure-off cooperation with the plate roller 6 above. The lifting and lowering of the lifting seat 30 can drive the first swing arm 2 to swing up and down (arc trajectory), and the lifting seat 30 is relatively stable. The first swing arm 2 is not only supported by the first swing support axis, but also supported by the second transmission shaft 32, and the first swing arm 2 is relatively stable during swinging.

[0060] Further optimization can be made. One end of the first swing arm 2 is connected to the first swing support shaft 20, and the second transmission shaft 32 is located at the other end of the first swing arm 2. The first swing support shaft 20 has a first swing support axis, and the first mounting portion is located between the first swing support shaft 20 and the second transmission shaft 32. The first swing support shaft 20 is connected to the machine frame 4. The two end support structures of the first swing arm 2 are formed, and the first swing arm 2 is more stable during swinging up and down. The transfer roller 1 also operates relatively stably.

[0061] For example, the first swing arm 2 includes a pair of left swing arm 21 and right swing arm, the left swing arm 21 is provided with a roll changing port 22, the roll changing port 22 is used for facilitating the axial movement of the transfer roller 1 to replace the assembly; The left swing arm 21 is provided with a roller body support end cover 23, the roller body support end cover 23 is connected at 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 the movable lock block 24.

[0062] In addition, the first transmission shaft 31 is arranged below the second transmission shaft 32, the first transmission shaft 31 can hold and support the second transmission 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 shaft 32, and the lifting seat 30 is located at the front side of the second transmission shaft 32, so that the space structure layout is reasonable and convenient for assembly. The first swing arm 2 is also provided with a first arc-shaped guide rail 41 for swing guiding and supporting, so that the first swing arm 2 can stably swing. The arc-shaped guide rail can be installed on the rack 4, and the arc-shaped guide rail can also be arranged at the swing distal end (i.e. the head) of the first swing arm 2.

[0063] The lifting seat 30 can be arranged on the vertical guide rail 37, and the vertical guide rail 37 can be installed on the rack 4, so that the lifting seat 30 can stably lift up and down vertically. 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 in transmission connection with the lifting drive screw 342, the lifting drive screw 342 is in transmission connection with the lifting drive nut, and the lifting drive nut is installed and connected on the lifting seat 30. The lifting drive screw 342 is vertically arranged. The lifting drive motor 341 drives the lifting drive nut to lift up and down through the lifting drive screw 342, which cooperates with the lifting seat 30 to lift up and down on the vertical guide rail 37. The lifting drive structure runs stably, can relatively accurately stay at a preset position, and can keep the position stable after staying without being easy to loosen, ensuring the printing stability and being able to withstand the pressure during printing.

[0064] In the chart, an embodiment of setting the position of the first rotary clutch eccentric sleeve 35: the first rotary clutch eccentric sleeve 35 is sleeved on the first transmission shaft 31, one end of the transmission arm 33 is sleeved on the second transmission shaft 32, and the other end of the transmission arm 33 is sleeved on the first rotary clutch eccentric sleeve 35, that is, the two end round holes of the transmission arm 33 are matched and sleeved on the second transmission shaft 32 and the first rotary clutch eccentric sleeve 35 respectively 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 shaft 31; in addition, the first rotary drive device 36 comprises a first rotary drive cylinder 361, the first rotary drive cylinder 361 is connected to the lifting 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 to change the 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 split structure), the first connecting swing arm 351 is in transmission connection with the first rotary drive cylinder 361, the first connecting swing arm 351 is driven to swing by the first rotary drive cylinder 361, so that the first rotary clutch eccentric sleeve 35 can be driven to rotate (back and forth), and in this structure, the transmission is reasonable, and subsequent limiting adjustment is facilitated.Further, the first eccentric sleeve rotation limiting and adjusting device 38 is connected to the lifting seat 30, which limits and adjusts the rotation position of the first rotation and clutch eccentric sleeve 35, ensures that the rotation angle position of the first rotation and clutch eccentric sleeve 35 is at a position with appropriate compression pressure, and ensures that the compression pressure state is reasonable. For example, the first rotation driving air cylinder 361 has a first push-pull piston rod 3611, and the first cylinder body 3612 of the first rotation driving air cylinder 361 is hingedly arranged on the lifting seat 30. The first push-pull piston rod 3611 is hingedly connected to the first connecting swing arm 351. The first eccentric sleeve rotation limiting and adjusting device 38 includes a first limiting part 381, which is located at the head of the first limiting shaft adjusting rod 382 (which can be a lead screw, etc.). The first limiting shaft adjusting rod 382 is arranged on the lifting seat 30. The position of the limiting part above the lifting seat 30 is adjusted by adjusting the position of the first limiting shaft adjusting rod 382 (such as a lead screw, which can be rotated and adjusted in position by a motor or hand wheel, etc.). The adjustment direction of the axial movement of the first limiting shaft adjusting rod 382 is up and down. When the first push-pull piston rod 3611 drives the first connecting swing arm 351 to rotate into position, the first limiting part 381 blocks the first connecting swing arm 351 to smoothly reach the position. For example, the first rotation driving air 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 rotation driving air cylinder 361 is located on the upper side of the first connecting swing arm 351. The first limiting part 381 can be used to block the position of the first connecting swing arm 351 driven downward by the first rotation driving air cylinder 361. The first push-pull piston rod 3611 of the first rotation driving air cylinder 361 can be pushed into position with high stability, which can limit and adjust the rotation position of the first rotation and clutch eccentric sleeve 35, ensure that the rotation angle position of the first rotation and clutch eccentric sleeve 35 is at a position with appropriate compression pressure, and ensure that the compression pressure state is reasonable. Other forms of first rotation driving devices 36 and eccentric sleeve rotation limiting and adjusting devices 38 can also be selected, such as the eccentric sleeve rotation limiting and adjusting device 38 containing a limiting and adjusting lead screw on the lifting seat 30.

[0065] Further, the swing driving structure comprises a second transmission driving device 8, the second transmission driving device 8 comprises a third transmission shaft 83 and a fourth transmission shaft 84, the third transmission shaft 83 is connected to the first swing arm 2, the fourth transmission shaft 84 is connected to the second swing arm 5, and the second transmission driving device 8 further comprises a distance adjusting device for adjusting the distance between the third transmission shaft 83 and the fourth transmission shaft 84, for example, the distance adjusting device comprises a screw nut distance adjusting transmission mechanism 80, the distance between the third transmission shaft 83 and the fourth transmission shaft 84 is adjusted by the screw nut distance adjusting transmission mechanism 80, that is, the screw nut distance adjusting transmission mechanism 80 is connected and arranged between the third transmission shaft 83 and the fourth transmission shaft 84, and the distance adjusting device (such as the screw nut distance adjusting transmission mechanism 80) can make the third transmission shaft 83 and the fourth transmission shaft 84 approach each other and move away 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 driving device 8, and even realize the pressure adjustment;

[0066] In addition, the distance adjusting device (such as the screw nut distance adjusting transmission mechanism 80) and the third transmission shaft 83 and / or the fourth transmission shaft 84 are further provided with a second rotary clutch eccentric sleeve 85; one or both can be provided; in the embodiment shown in the figure, the second rotary clutch eccentric sleeve 85 is arranged between the fourth transmission shaft 84 and the screw nut distance adjusting transmission mechanism 80. The second rotary clutch eccentric sleeve 85 is drivingly connected with a corresponding second rotary driving device 86, and the second rotary clutch eccentric sleeve 85 is rotated by the second rotary driving device 86 to change the relative position between the screw nut distance adjusting transmission mechanism 80 and the third transmission shaft 83 and / or the fourth transmission shaft 84, so as to realize the swing lifting of the second swing arm 5 and the bottom roller 7 mounted thereon in a small additional range (matching the eccentric range of the eccentric sleeve), and the second swing arm 5 can swing in a small additional range relative to the first swing arm 2, and can cooperate with the switching between the pressure combination and the pressure separation state in the printing operation (with the transfer roller 1). The corresponding second rotary driving device 86 is arranged on the first swing arm 2 and / or the corresponding second rotary driving device 86 is arranged on the second swing arm 5, for example, the second rotary clutch eccentric sleeve 85 is connected with the fourth transmission shaft 84, and the corresponding second rotary driving device 86 can be arranged on the second swing arm 5.

[0067] For example, in the figure, an embodiment for arranging the second rotary clutch eccentric sleeve 85 is shown: the second rotary clutch eccentric sleeve 85 is arranged on the fourth transmission shaft 84, and the screw nut distance adjusting transmission mechanism 80 is arranged on the second rotary clutch eccentric sleeve 85; in addition, the second rotary driving device 86 comprises a second rotary driving cylinder 861, the second rotary driving cylinder 861 is connected to the second swing arm 5, the second rotary driving cylinder 861 lifts and swings together with the second swing arm 5 and can drive the second rotary clutch eccentric sleeve 85 to rotate and change the relative position; in addition,

[0068] The second rotating and clamping eccentric sleeve 85 has a second connecting swing arm 851 which rotates together with the second rotating and clamping eccentric sleeve 85 (which can be an integral structure or a split structure), and is in transmission connection with the second rotating drive air cylinder 861. The second connecting swing arm 851 is swung by the second rotating drive air cylinder 861, so as to drive the second rotating and clamping eccentric sleeve 85 to rotate (back and forth). In this structure, the transmission is reasonable, and subsequent limit adjustment is facilitated. In addition, the second swing arm 5 is also connected with a second eccentric sleeve rotating limit adjustment device 88. The second eccentric sleeve rotating limit adjustment device 88 limits and adjusts the rotating position of the second rotating and clamping eccentric sleeve 85, so as to ensure that the rotating angle position of the second rotating and clamping eccentric sleeve 85 is at a position with a suitable pressing force, and ensure that the pressing force state is reasonable. For example, the second rotating drive air cylinder 861 has a second push-pull piston rod 8611, and the second cylinder body 8612 of the second rotating drive air cylinder 861 is hingedly arranged on the second swing arm 5. The second push-pull piston rod 8611 is hingedly connected with the second connecting swing arm 851. The second eccentric sleeve rotating limit adjustment device 88 includes a second limiting portion 881 which is located at the head of a second limiting shaft adjustment rod 882 (which can be a lead screw, etc.). The second limiting shaft adjustment rod 882 is arranged on the second swing arm 5. The position of the limiting portion on the second swing arm 5 is adjusted by adjusting the position of the second limiting shaft adjustment rod 882 (such as a lead screw, etc., which can be rotated and adjusted in position by a motor or a hand wheel, etc.). For example, the axial movement adjustment direction of the second limiting shaft adjustment rod 882 is forward and backward adjustment. When the second push-pull piston rod 8611 drives the second connecting swing arm 851 to rotate to the position, the second connecting swing arm 851 is blocked by the second limiting portion 881, so that the second connecting swing arm 851 is smoothly positioned. For example, the second rotating drive air cylinder 861 and the second limiting portion 881 are respectively arranged on the same side of the second connecting swing arm 851. By using the different forward and backward positions of the second limiting portion 881, the position of the second connecting swing arm 851 which is swung by the transmission of the second rotating drive air cylinder 861 can be blocked. The second push-pull piston rod 8611 of the second rotating drive air cylinder 861 can be pulled to the position, and the stability is high. The rotating position of the second rotating and clamping eccentric sleeve 85 can be limited and adjusted, so as to ensure that the rotating angle position of the second rotating and clamping eccentric sleeve 85 is at a position with a suitable pressing force, and ensure that the pressing force state is reasonable.

[0069] For example, the screw-nut distance adjusting transmission mechanism 80 comprises a screw rod support seat 801, a transmission screw rod 802 and a transmission screw nut 803. The transmission screw rod 802 is arranged on the screw rod support seat 801, and the transmission screw rod 802 is in matched transmission connection with the transmission screw nut 803. One of the screw rod support seat 801 and the transmission screw nut 803 is connected to the first swing arm 2 through a third transmission shaft 83, and the other is connected to the second swing arm 5 through a fourth transmission shaft 84. The transmission screw rod 802 on the screw rod support seat 801 can be driven to rotate or move axially by a hand wheel or a motor.

[0070] For another example, one end of the second swing arm 5 is connected to the second swing support shaft 50, the fourth transmission shaft 84 is located at the other end of the second swing arm 5, the second swing support shaft line is the second swing support shaft line, the second mounting portion is located between the second swing support shaft 50 and the fourth transmission shaft 84, and the second swing support shaft 50 is connected to the rack 4. The second swing support shaft 50 is located at the rear side of the fourth transmission shaft 84, the second swing arm 5 is also provided with a second arc-shaped guide rail 42 for swing guide support, the second swing support shaft line is arranged below the first swing support shaft line, and the second swing support shaft line is arranged at the rear side of the first swing support shaft line.

Claims

1. A double swing arm offset printing device, comprising a plate roller shaft, a first swing arm (2) and a second swing arm (5), a plate roller cylinder (6) is arranged on the plate roller shaft and can be disassembled and replaced, a transfer roller shaft is arranged on the first swing arm (2), and a transfer roller cylinder (1) is arranged on the transfer roller shaft (10) and can be disassembled and replaced, the diameters of the plate roller cylinder and the transfer roller cylinder are matched, a bottom roller (7) is arranged on the second swing arm (5), the first swing arm (2) is connected to a first swing support shaft (20), a first mounting portion for mounting the transfer roller shaft (10) is arranged on the first swing arm (2), the first swing support shaft (20) is located at the rear side of the first mounting portion, and the center distance between the transfer roller shaft (10) and the first swing support shaft (20) is a first distance R1, the second swing arm (5) is connected to a second swing support shaft (50), a second mounting portion for mounting the bottom roller is arranged on the second swing arm (5), the second swing support shaft (50) is located at the rear side of the second mounting portion, and the center distance between the bottom roller (7) and the second swing support shaft (50) is a second distance R2, and the device is characterized in that: a ray L is drawn from the axis point (60) of the plate roller shaft as an end point and downwardly and forwardly by an angle β, three outer diameter specifications of large, medium and small plate roller cylinders (6) are used to determine corresponding planned running axis point positions a, b and c of three outer diameter specifications of large, medium and small transfer roller cylinders (1), and the positions a, b and c are located on the ray L, and the positions a, b and c on the ray L form a line segment D, a perpendicular line M of the line segment D is drawn, and a swing support shaft center position o1 point of the first swing support shaft (20) is located on the perpendicular line M, a circular arc C1 is drawn with the o1 point as the center and with R1 as the radius, and the planned running axis point position a and the planned running axis point position c are located on the outer side of the circular arc C1, and the planned running axis point position b is located on the inner side of the circular arc C1; straight lines connecting the o1 point and the planned running axis point positions a, b and c intersect the circular arc C1 at point positions a', b' and c' respectively, the planned running axis point positions d, e and f of the bottom roller are determined by vertically downwardly drawing the point positions a', b' and c' respectively and by using the sum of the radius of the corresponding specification of the transfer roller cylinder (1) and the radius of the bottom roller (7) as the distance, a circular arc C2 is determined by using the planned running axis point positions d, e and f of the bottom roller (7), and the center of the circular arc C2 is determined as a planned running swing support shaft center position o2 point of the second swing support shaft (50); or a circular arc C2' is drawn with the radius R2, and the planned running axis point position d and the planned running axis point position f are located on the outer side of the circular arc C2', and the planned running axis point position e is located on the inner side of the circular arc C2', the center of the circular arc C2' is determined as a swing support shaft center position o2' point of the second swing support shaft (50), and the o2' point falls on the line connecting the o2 point and the planned running axis point position e or falls on the perpendicular line of the corresponding chord length of the circular arc C2.

2. The double swing arm offset printing device according to claim 1, wherein: 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 roller cylinders are respectively the maximum size, the middle size and the minimum size preset by the factory.

3. The double swing arm offset printing device according to claim 2, wherein: R1 is 350 mm, β is 25 degrees, and R2 is 400 mm; The outer diameters of the three rollers are 220 mm, 170 mm, and 120 mm, The outer diameter of the bottom roller is 145 mm.

4. The double swing arm offset printing device according to claim 1, wherein: The roller shaft is mounted on the frame, the first swing support shaft is mounted on the frame, and the second swing support shaft is mounted on the frame; The radius of the circular arc C1 is R1, and the radius of the circular arc C2 or C2' is R2.

5. The double swing arm offset printing device according to claim 1, wherein: The roller station is arranged above the first mounting portion, the roller shaft is arranged in the roller station, the second mounting portion is arranged below the first mounting portion, and the first swing support shaft and the second swing support shaft are both arranged horizontally.

6. The double swing arm offset printing device according to claim 1, wherein: The swing driving structure is also provided, and the first swing arm (2) and the second swing arm (5) are transmissionally connected with the swing driving structure.

7. The double-swing-arm offset printing device according to claim 6, characterized in that: The swing driving structure comprises a first transmission driving device (3), the first transmission driving device (3) comprises a lifting seat (30), a lifting driving 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 transmissionally connected with the lifting driving 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 with the first transmission shaft (31), and the other end of the transmission arm (33) is connected with the second transmission shaft (32); The first rotary clutch eccentric sleeve (35) is further arranged 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 transmissionally connected with a corresponding first rotary driving device (36), The corresponding first rotary driving device (36) is arranged on the lifting seat (30) and / or the corresponding first rotary driving 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 with 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 with the frame (4); The first swing arm (2) comprises a left swing arm (21) and a right swing arm, the left swing arm (21) is provided with a roller changing opening (22), and the left swing arm (21) is provided with a roller body support end cover (23) connected with the roller 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 guiding and supporting. The lifting seat (30) is arranged on the vertical guide rail (37) which is arranged on the frame, The lifting driving device (34) comprises a lifting driving motor (341), a lifting driving screw rod (342) and a lifting driving screw nut, the lifting driving motor (341) is in transmission connection with the lifting driving screw rod (342), the lifting driving screw rod (342) is in transmission connection with the lifting driving screw nut, the lifting driving screw nut is installed and connected on the lifting seat (30), and the lifting driving screw rod (342) is vertically arranged; The first transmission shaft (31) is sleeved with the first rotary clutch eccentric sleeve (35), One end of the transmission arm (33) is sleeved on the second transmission shaft (32), The other end of the transmission arm (33) is sleeved on the first rotary clutch eccentric sleeve (35), The first rotary driving device (36) comprises a first rotary driving cylinder (361), the first rotary driving cylinder (361) is connected on the lifting seat (30), The first rotary clutch eccentric sleeve (35) has a first connecting swing arm (351), and the first connecting swing arm (351) is in transmission connection with the first rotary driving cylinder (361); The lifting seat (30) is further connected with the first eccentric sleeve rotary limiting adjustment device (38); The first rotary driving cylinder (361) has a first push-pull piston rod (3611), a first cylinder body (3612) of the first rotary driving cylinder (361) is hingedly arranged on the lifting seat (30), the first push-pull piston rod (3611) is hingedly connected with the first connecting swing arm (351), The first eccentric sleeve rotary limiting adjustment device (38) comprises a first limiting part (381), the first limiting part (381) is located at the head of a first limiting shaft moving adjustment rod (382), and the first limiting shaft moving adjustment rod (382) is arranged on the lifting seat (30).

9. The double swing arm type offset printing device according to claim 1, wherein: The swing driving structure comprises a second transmission driving device (8), the second transmission driving device (8) comprises a third transmission shaft (83) and a fourth transmission shaft (84), The third transmission shaft (83) is connected on the first swing arm (2), and the fourth transmission shaft (84) is connected on the second swing arm (5), The second transmission driving device (8) further comprises a pitch adjusting device for adjusting the distance between the third transmission shaft (83) and the fourth transmission shaft (84), The pitch adjusting device comprises a screw rod and screw nut pitch adjusting transmission mechanism (80), and the screw rod and screw nut pitch adjusting transmission mechanism (80) is arranged between the third transmission shaft (83) and the fourth transmission shaft (84); The screw rod and screw nut pitch adjusting transmission mechanism (80) is further provided with a second rotary clutch eccentric sleeve (85) between the third transmission shaft (83) and / or the fourth transmission shaft (84), and the second rotary clutch eccentric sleeve (85) is in transmission connection with a corresponding second rotary driving device (86), The corresponding second rotary driving device (86) is arranged on the first swing arm (2) and / or the corresponding second rotary driving device (86) is arranged on the second swing arm (5).

10. The double swing arm type offset printing device according to claim 9, wherein: The fourth transmission shaft (84) is sleeved with a second rotary clutch eccentric sleeve (85), The screw nut distance adjustment transmission mechanism (80) is sleeved on the second rotary clutch eccentric sleeve (85), The second rotary drive device (86) comprises 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); The second swing arm (5) is further connected with a second eccentric sleeve rotary limiting adjustment device (88), The second rotary drive cylinder (861) has a second push-pull piston rod (8611), and a 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 with the second connecting swing arm (851); The second eccentric sleeve rotary limiting adjustment device (88) comprises a second limiting part (881), and the second limiting part (881) is located at the head of a second limiting shaft adjustment rod (882), and the second limiting shaft adjustment rod (882) is arranged on the second swing arm (5); The screw nut distance adjustment transmission mechanism (80) comprises a screw rod support seat (801), a transmission screw rod (802) and a transmission screw nut (803), the transmission screw rod (802) is arranged on the screw rod support seat (801), and the transmission screw rod (802) is in transmission connection with the transmission screw nut (803); One of the screw rod support seat (801) and the transmission screw nut (803) is connected to the first swing arm (2) through the third transmission 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 shaft (84); One end of the second swing arm (5) is connected to the second swing support shaft (50), the fourth transmission shaft (84) is located at the other end of the second swing arm (5), the second mounting part is located between the second swing support shaft (50) and the fourth transmission shaft (84), and the second swing support shaft (50) is connected to the rack (4); The second swing support shaft (50) is located at the rear side of the fourth transmission shaft (84), The second swing arm (5) is further provided with a second arc-shaped guide rail (42) for swing guide support; The second swing support shaft is arranged below the first swing support shaft, The second swing support shaft is arranged at the rear side of the first swing support shaft.

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