CN221969167U - Correction printing device for flexographic printing press - Google Patents

Abstract

The utility model relates to a correction printing device of a flexographic printing machine, which comprises a printing machine frame and a correction machine frame, wherein an anilox roller assembly and a plate roller assembly are arranged on the correction machine frame, the printing machine frame is provided with the printing roller assembly, the anilox roller assembly and the plate roller assembly are driven by a gear transmission mechanism, the plate roller assembly is positioned above the printing roller assembly and the anilox roller assembly, the plate roller assembly is respectively tangent to the surfaces of roller bodies of the printing roller assembly and the anilox roller assembly, the correction device for driving the correction machine frame to move relative to the printing machine frame is arranged between the printing machine frame and the correction machine frame, the correction device drives the anilox roller assembly and the plate roller assembly to horizontally slide relative to the printing roller assembly, the whole printing roller assembly is not driven to move, and accurate color printing is avoided from being driven to move, and the problem of folds and offset caused by the movement of printing materials together in the prior art is solved.

Description

Correction printing device for flexographic printing press

Technical Field

The utility model relates to the field of printing presses, in particular to a deviation-correcting printing device of a flexographic printing press.

Background Art

Flexographic printing press is a device that uses a flexible photosensitive resin plate or rubber plate as a printing plate, transfers ink through an anilox roller and prints on the substrate. Printing inks are divided into three categories, namely water-based inks, alcohol-soluble inks, and UV inks. Since the inks used in flexographic printing are green and environmentally friendly, they have been widely used in food packaging printing and have broad prospects.

The utility model patent with the existing publication number CN217863229U discloses a flexographic printing machine, which is provided with a feeding mechanism, a front tension mechanism, a printing mechanism, a rear tension mechanism, and a material receiving mechanism. The feeding mechanism includes an automatic roll changing device, an automatic unwinding and rewinding device, and an automatic cutting device. The front tension mechanism is provided with an automatic deviation correction device and a front tension control device. The printing mechanism is provided with a plate roller pressure adjustment device, an axial registration device, and an air drying device. The rear tension mechanism is provided with a rear tension control device and an online detection device. The printing machine has a high degree of automation and can realize the whole process of feeding, printing, detection, and rewinding, thereby improving the printing quality and the printing efficiency. The feeding mechanism 1 feeds large rolls of printed products, the front tension mechanism 2 controls the unwinding tension and blocks the tension fluctuation caused by unwinding, the printing mechanism 3 prints the material strip, the rear tension mechanism 4 detects the printed material strip and blocks the tension fluctuation caused by receiving the material, and the receiving mechanism 5 winds the printed material strip into a roll. A control center 6 is also provided, and the control center 6 controls each mechanism to perform a predetermined action.

In the above technical scheme, the printing mechanism 3 is provided with an upper frame 31 and a lower frame 32, and a printing roller 33, an anilox roller 34 and a plate roller 35 are provided on the upper frame 31. The printing roller 33, the anilox roller 34 and the plate roller 35 are driven by gears, and a plate roller fixing plate 351 is provided at the shaft end of the plate roller 35. The plate roller 35 is located above the printing roller 33 and the anilox roller 34. The printing roller 33 and the anilox roller 34 are fixed on the upper frame 31 and can rotate around the axis. The plate roller 35 is tangent to the printing roller 33 and the anilox roller 34 respectively. The printing mechanism 3 is provided with a plate roller pressure regulating device 36, an axial registration device 37 and an air drying device 38. However, in the printing process, in order to ensure the stability of the printed product, the printing roller 33 and the anilox roller 34 are provided with a plate roller pressure regulating device 36, an axial registration device 37 and an air drying device 38. The plate roller 35 can transfer the ink on the anilox roller 34 to the preset position of the printed product during accurate printing through the plate roller 35. It is necessary to adjust the printing position of the plate roller 35. In this technical solution, the axial registration device 37 is used to drive the upper frame and the lower frame having the printing roller 33, the anilox roller 34, and the plate roller 35 to move relative to each other to solve the color registration deviation, thereby improving the color registration accuracy. However, this method of driving the printing roller 33, the anilox roller 34, and the plate roller 35 to move at the same time will move the printed product on the printing mechanism 3 together, causing the printed product to be easily wrinkled and offset, so that the entire adjustment process requires loosening the pressure of the plate roller 35 before correction and adjustment, which makes the entire process cumbersome and unstable.

Summary of the invention

The technical problem to be solved by the utility model is to provide a deviation-correcting printing device for a flexographic printing press in view of the deficiencies of the above-mentioned prior art.

To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a deflection correction printing device of a flexographic printing machine, comprising a printing frame and a deflection correction frame, the deflection correction frame is provided with a screen roller assembly and a plate roller assembly, and is characterized in that: a printing frame is provided with a printing roller assembly, the printing roller assembly, the screen roller assembly and the plate roller assembly are driven by a gear transmission mechanism, the plate roller assembly is located above the printing roller assembly and the screen roller assembly, the plate roller assembly is tangent to the roller body surfaces of the printing roller assembly and the screen roller assembly respectively, a deflection correction device for driving the deflection correction frame to move relative to the printing frame is provided between the printing frame and the deflection correction frame, and the deflection correction device drives the screen roller assembly and the plate roller assembly to slide horizontally relative to the printing roller assembly.

By adopting the above technical solution, through the independent design of the correcting frame and the printing frame, the plate roller assembly and the anilox roller assembly are independent of the printing roller assembly, so that when the left and right positions of the printed matter are adjusted, the correcting device will only drive the positions of the plate roller assembly and the anilox roller assembly, and will not drive the entire printing roller assembly to move, thereby avoiding driving the printed matter to move, thereby achieving accurate color printing and solving the wrinkle and offset problems caused by the movement of the printed matter in the previous technology.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: the correction device includes a correction screw and a correction screw sleeve coaxially arranged on the printing frame and the correction frame respectively, and a manual correction part is provided after the correction screw passes through the correction screw sleeve, and the correction screw sleeve is threadedly connected to the correction screw, and the correction frame is driven to move horizontally along the correction screw sleeve relative to the printing frame by rotating the manual correction part.

By adopting the above technical solution, through the cooperation of the coaxially arranged correction screw and the correction sleeve, manual rotation of the manual correction part can push the correction frame to move horizontally along the correction sleeve, allowing the operator to manually adjust the position of the plate roller to achieve accurate color correction.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: the correction frame is arranged on the inner side of the printing frame, the correction screw sleeve is fixedly installed on the correction frame, the correction screw is rotatably installed on the printing frame, one end of the correction screw passes through the correction screw sleeve and is provided with the manual correction part, and the other end is provided with an electric drive mechanism for driving the correction screw to rotate.

By adopting the above technical solution, the electric drive mechanism transmits the rotational power of the motor to the deviation-correcting screw, thereby realizing relative movement between the frames and improving the automation level and work efficiency.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: the electric drive mechanism includes a correction synchronous wheel arranged at the end of the correction screw away from the manual correction part, a correction motor arranged at the end of the printing frame corresponding to the correction synchronous wheel, and a correction synchronous belt wound between the active synchronous wheel and the correction synchronous wheel at the output end of the correction motor.

By adopting the above technical solution, a transmission system consisting of a correction synchronous belt, a correction synchronous wheel and a correction motor is utilized to convert the rotational power of the motor into the rotation of the correction screw. On the basis of manual correction, electric correction can also be achieved to improve production efficiency.

The above-mentioned deflection correction printing device of the flexographic printing press can be further configured as follows: a photoelectric sensor for detecting the position of the printed product is provided at the printing frame corresponding to the printing roller assembly, and the photoelectric sensor is electrically connected to the deflection correction motor.

By adopting the above technical solution, the photoelectric sensor detects the position information of the printed product and transmits the signal to the correction motor, which controls the correction action to ensure the correct position of the printed product, monitor the position of the printed product in real time, and automatically correct the deviation.

The above-mentioned corrective printing device of the flexographic printing machine can be further configured as follows: the printing roller assembly includes a printing roller and a printing gear arranged on one side of the printing roller, the plate roller assembly includes a plate roller and a plate roller disc arranged on both sides of the plate roller, the anilox roller assembly includes an ink cartridge and an anilox roller that applies ink in the ink cartridge to the plate roller, the gear transmission mechanism includes a printing motor arranged on the printing frame to drive the printing roller to rotate, a plate roller gear arranged at the printing gear corresponding to the plate roller, and an anilox gear arranged at one end of the plate roller gear corresponding to the anilox roller, the plate roller gear is respectively meshed with the printing gear and the anilox gear, and the correction frame corresponding to the plate roller is provided with a plate roller pressure adjustment device for adjusting the pressure between the plate roller and the printing roller and the anilox roller, and a locking rotation device for fixing the plate roller disc.

By adopting the above technical solution, the printing motor drives the printing roller to rotate, and synchronizes the power to the plate roller and the anilox roller through the printing gear to achieve synchronous rotation and improve printing quality. Bing'er uses the plate roller pressure adjustment device and the locking rotation device to conveniently adjust the pressure between the plate roller, the printing roller and the anilox roller to improve the printing effect and adapt to the printing of substrates of different specifications and thicknesses. The locking rotation device ensures that the plate roller is limited and will not disengage when rotating, thereby improving the transmission stability.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: the plate roller pressure adjustment device includes a printing adjustment block arranged at one end of the correction frame corresponding to the printing roller, a printing pressure adjustment screw arranged at one side of the printing adjustment block, a screen adjustment block arranged at one end of the correction frame corresponding to the anilox roller, and an anilox pressure adjustment screw arranged at one side of the anilox adjustment block, one end of the printing adjustment block and the anilox adjustment block are hinged to each other with the correction frame through a hinge shaft, and the other ends respectively correspond to the ends of the printing pressure adjustment screw and the anilox pressure adjustment screw, the printing adjustment block and the anilox adjustment block jointly support the plate roller disc, and by rotating the printing pressure adjustment screw and/or the anilox pressure adjustment screw, the printing adjustment block and/or the anilox adjustment block are driven to rotate along the hinge shaft as a fulcrum to adjust the gap between the plate roller and the printing roller and the anilox roller.

By adopting the above technical solution, the position of the adjusting block is changed by rotating the printing pressure adjusting screw and/or the anilox pressure adjusting screw, thereby adjusting the gap and accurately adjusting the pressure between the plate roller, the printing roller and the anilox roller, thereby ensuring the printing stability and quality under different pressure requirements.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: an emergency separation mechanism for controlling the axial lifting and lowering of the plate roller is provided at the correction frame corresponding to the plate roller, and the emergency separation mechanism includes a separation rocker arm and a separation cylinder arranged on the correction frame, one end of the separation rocker arm is hinged to the correction frame, and the other end is connected to the output end of the separation cylinder, the hinge shaft is connected to the separation rocker arm, and drives the plate roller to approach or move away from the printing roller and/or the anilox roller through the separation cylinder.

By adopting the above technical solution, the separation rocker arm moves through the action of the separation cylinder, thereby realizing the rapid lifting and lowering of the plate roller, responding quickly in an emergency, preventing damage to the plate roller or other components, and facilitating the rapid separation of the plate roller when shutting down.

The above-mentioned corrective printing device of the flexographic printing machine can be further configured as follows: the locking rotation device includes locking cylinders arranged at both ends of the corrective frame corresponding to the plate roller disc and a locking groove opened on the surface of the plate roller disc, and the output end of the locking cylinder is provided with a locking rod that enters or exits the locking groove.

By adopting the above technical solution, the locking cylinder controls the locking rod to enter or exit the locking groove on the plate roller disc, thereby realizing axial locking and unlocking of the plate roller.

The above-mentioned correction printing device of the flexographic printing machine can be further configured as follows: the anilox roller assembly also includes an ink cartridge swing frame and an ink transfer roller, the ink cartridge is arranged on the ink cartridge swing frame, the anilox roller is arranged above the ink cartridge, and rotates against the ink cartridge through the ink transfer roller, the ink cartridge swing frame is rotatably connected to the correction bracket through the ink cartridge rotating shaft, the correction bracket is provided with ink cartridge locking cylinders on both sides of the ink cartridge swing frame, the ink cartridge swing frame approaches or moves away from the plate roller with the ink cartridge rotating shaft as a fulcrum, and the ink cartridge swing frame is fixed to the correction bracket through the ink cartridge locking cylinder.

By adopting the above technical solution, the ink cartridge swing rack can rotate around the rotating shaft, approaching or moving away from the plate roller, and the ink transfer roller is responsible for evenly applying the ink to the plate roller, making it convenient to replace and add ink.

The utility model is further described below in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective schematic diagram of an embodiment of the utility model.

FIG. 2 is a schematic structural diagram of an embodiment of the utility model.

FIG. 3 is a left side view of an embodiment of the utility model.

FIG. 4 is an exploded view of an embodiment of the present utility model.

FIG. 5 is an exploded view 2 of an embodiment of the utility model.

FIG. 6 is a schematic structural diagram of the anilox roller assembly when separated according to an embodiment of the present utility model.

FIG. 7 is a front view of an embodiment of the utility model.

FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7 .

Implementation

As shown in Fig. 1 to Fig. 6, the deflection correction printing device of the flexographic printing machine comprises a printing frame 1 and a deflection correction frame 2 arranged in the printing frame 1, the deflection correction frame 2 is provided with an anilox roller assembly and a plate roller assembly, the printing frame 1 is provided with a printing roller assembly, the printing roller assembly, the anilox roller assembly and the plate roller assembly are driven by a gear transmission mechanism, the plate roller assembly is located above the printing roller assembly and the anilox roller assembly, the plate roller assembly is tangent to the roller body surface of the printing roller assembly and the anilox roller assembly respectively, a deflection correction device for driving the deflection correction frame 2 to move relative to the printing frame 1 is provided between the printing frame 1 and the deflection correction frame 2, and the deflection correction device drives the anilox roller assembly and the plate roller assembly to slide horizontally relative to the printing roller assembly, The correction device includes a correction screw 11 and a correction screw sleeve 21 which are coaxially arranged on the printing frame 1 and the correction frame 2, respectively. A manual correction part 111 is arranged at one end of the correction screw 11 after passing through the correction screw sleeve 21, and an electric driving mechanism is arranged at the other end to drive the correction screw 11 to rotate. The correction screw sleeve 21 is threadedly connected with the correction screw 11, and the correction frame 2 is driven to move horizontally along the correction guide shaft 12 relative to the printing frame 1 by rotating the manual correction part 111. The electric driving mechanism includes a correction synchronous wheel 112 which is arranged at one end of the correction screw 11 away from the manual correction part 111, a correction motor 13 which is arranged at one end of the printing frame 1 corresponding to the correction synchronous wheel 112, and a correction motor 14 which is arranged at one end of the printing frame 1 corresponding to the correction synchronous wheel 112. A deflection correction synchronous belt (not shown in the figure) is arranged between the active synchronous wheel 131 and the deflection correction synchronous wheel 112 at the output end of the deflection correction motor 13. A photoelectric sensor 10 for detecting the position of the printed product is arranged at the printing roller assembly corresponding to the printing roller assembly of the printing frame 1. The photoelectric sensor 10 is electrically connected to the deflection correction motor 13. When the flexographic printing machine is used for the first time, the printed product will pass between the printing roller assembly and the plate roller assembly, and the ink will be transferred to the plate roller assembly through the anilox roller assembly, and then printed on the surface of the printed product on the printing roller assembly. At this time, if the printing position of the printed product is offset, it is only necessary to manually rotate the manual deflection correction part 111, and the deflection correction screw 11 will rotate in the deflection correction screw sleeve 21, and drive the deflection correction bracket 2 to rotate along the deflection correction screw sleeve 21. The deflection screw sleeve 21 moves horizontally left and right, thereby adjusting the relative position between the plate roller assembly and the printing roller assembly. Due to the direct movement relative to the printed product, the printed product close to the surface of the printing roller assembly will not move, thereby avoiding the occurrence of wrinkles and offsets, and achieving stable corrective color printing. At the same time, the printing device is also equipped with automatic real-time correction. During the operation of the equipment, if the printed product is offset, the printed product will exceed the preset sensing range of the photoelectric sensor 10. At this time, the correction motor 13 will rotate in the forward and reverse directions, and drive the correction synchronous wheel 112 to rotate through the synchronous belt, and then the correction screw 11 will be linked to rotate for correction until it returns to the normal track, thereby achieving automatic correction.

As shown in Fig. 1 to Fig. 8, the printing roller assembly includes a printing roller 3 and a printing gear 31 arranged on one side of the printing roller 3, the plate roller assembly includes a plate roller 4 and plate roller discs 41 arranged on both sides of the plate roller 4, the anilox roller assembly includes an anilox roller 5, an ink cartridge swing frame 51, an ink cartridge 52 and an ink transfer roller 53, the ink cartridge 52 is arranged on the ink cartridge swing frame 51, the anilox roller 5 is arranged above the ink cartridge 52, and rotates against the ink cartridge 52 through the ink transfer roller 53, and the ink cartridge swing frame 51 rotates through the ink transfer roller 53. The cartridge shaft 54 is rotatably connected to the deflection correction bracket 2. The deflection correction bracket 2 is provided with a cartridge locking cylinder 55 on both sides of the cartridge swing frame 51. The cartridge swing frame 51 approaches or moves away from the plate roller 4 with the cartridge shaft 54 as a fulcrum, and is fixed to the deflection correction bracket 2 by the cartridge locking cylinder 55. By pushing and pulling the cartridge swing frame 51, the cartridge swing frame 51 approaches or moves away from the plate roller 4 with the cartridge shaft 54 as a fulcrum, so that the ink can be replaced conveniently and the anilox roller assembly can be maintained.

As shown in Figures 1 to 8, the gear transmission mechanism includes a printing motor 32 arranged on the printing frame 1 to drive the printing roller 3 to rotate, a plate roller gear 42 arranged at the plate roller 4 corresponding to the printing gear 31, and an anilox gear 50 arranged at one end of the anilox roller 5 corresponding to the plate roller gear 42. The plate roller gear 42 is meshed with the printing gear 31 and the anilox gear 50 respectively. The correction frame 2 is provided with a plate roller pressure regulating device for regulating the pressure between the plate roller 4 and the printing roller 3 and the anilox roller 5, and a locking rotation device for fixing the plate roller disc 41. The plate roller pressure regulating device includes a printing regulating block 33 arranged at one end of the correction frame 2 corresponding to the printing roller 3, a printing pressure regulating screw 34 arranged on one side of the printing regulating block 33, and a plate roller pressure regulating screw 35 arranged on the correction frame 2. Corresponding to the anilox adjustment block 35 at one end of the anilox roller 5 and the anilox pressure adjustment screw 36 arranged on one side of the anilox adjustment block 35, one end of the printing adjustment block 35 and the anilox adjustment block 33 are hinged to each other with the correction frame 2 through the hinge shaft 350, and the other ends respectively correspond to the ends of the printing pressure adjustment screw 34 and the anilox pressure adjustment screw 36. The printing adjustment block 33 and the anilox adjustment block 35 jointly support the plate roller disc 31, and by rotating the printing pressure adjustment screw 34 and/or the anilox pressure adjustment screw 36, the printing adjustment block 33 and/or the anilox adjustment block 35 are driven to rotate along the hinge shaft 350 as a fulcrum, thereby adjusting the gap between the plate roller 4 and the printing roller 3 and the anilox roller 5, conveniently adjusting the pressure between them, and adapting to printing products of different thicknesses.

As shown in Figures 3 and 8, an emergency separation mechanism for controlling the axial lifting of the plate roller 4 is provided at the position of the correction frame 2 corresponding to the plate roller 4. The emergency separation mechanism includes a separation rocker arm 61 and a separation cylinder 6 arranged on the correction frame 2. One end of the separation rocker arm 61 is hinged to the correction frame 2, and the other end is connected to the output end of the separation cylinder 61. The hinge shaft 350 is connected to the separation rocker arm 61, and the plate roller 4 is driven to approach or move away from the printing roller 3 and/or the anilox roller 5 through the separation cylinder 6, so that it can quickly release the pressure, thereby realizing the installation and detachment of the plate roller 4.

As shown in Figure 6, the locking rotation device includes a locking cylinder 7 arranged at both ends of the correction frame 2 corresponding to the plate roller disc 41 and a locking groove 411 opened on the surface of the plate roller disc 41. The output end of the locking cylinder 7 is provided with a locking rod (not shown in the figure) that enters or escapes from the locking groove 7. Through the setting of the locking cylinder 7, the locking cylinder 7 and the locking groove 411 cooperate to limit the displacement of the plate roller 4, and can rotate on the surface to achieve stable printing.

Claims (10)

1. The utility model provides a printing device that rectifies of flexographic printing machine, includes printing frame and the frame of rectifying, be provided with reticulation roller assembly, version roller assembly on the frame of rectifying, its characterized in that: the printing machine comprises a printing machine frame, and is characterized in that a printing roller assembly is arranged on the printing machine frame, the printing roller assembly, an anilox roller assembly and a plate roller assembly are transmitted through a gear transmission mechanism, the plate roller assembly is positioned above the printing roller assembly and the anilox roller assembly, the plate roller assembly is tangent to the surface of a roller body of the printing roller assembly and the surface of a roller body of the anilox roller assembly respectively, a deviation correcting device for driving the deviation correcting machine frame to move relative to the printing machine frame is arranged between the printing machine frame and the deviation correcting machine frame, and the deviation correcting device drives the anilox roller assembly and the plate roller assembly to horizontally slide relative to the printing machine frame.

2. The offset printing apparatus of a flexographic printing machine according to claim 1, wherein: the deviation correcting device comprises a deviation correcting screw rod and a deviation correcting screw sleeve which are coaxially arranged on the printing machine frame and the deviation correcting machine frame respectively, a manual deviation correcting part is arranged after the deviation correcting screw rod passes through the deviation correcting screw sleeve, the deviation correcting screw sleeve is in threaded connection with the deviation correcting screw rod, and the deviation correcting machine frame is driven to horizontally move along the deviation correcting screw sleeve relative to the printing machine frame by rotating the manual deviation correcting part.

3. The offset printing apparatus of a flexographic printing machine according to claim 2, wherein: the correcting machine frame is arranged on the inner side of the printing machine frame, the correcting screw sleeve is fixedly arranged on the correcting machine frame, the correcting screw rod is rotatably arranged on the printing machine frame, one end of the correcting screw rod penetrates through the correcting screw sleeve to be provided with the manual correcting part, and the other end of the correcting screw rod is provided with an electric driving mechanism for driving the correcting screw rod to rotate.

4. A correction printing device for a flexographic printing machine according to claim 3, wherein: the electric driving mechanism comprises a correction synchronous wheel arranged at one end of the correction screw far away from the manual correction part, a correction motor arranged at one end of the printing frame corresponding to the correction synchronous wheel, and a correction synchronous belt wound between the driving synchronous wheel at the output end of the correction motor and the correction synchronous wheel.

5. The offset printing apparatus of a flexographic printing machine according to claim 4, wherein: the position of the printing machine frame corresponding to the printing roller assembly is provided with a photoelectric sensor for detecting the position of a printing product, and the photoelectric sensor is electrically connected with a deviation correcting motor.

6. The offset printing apparatus of a flexographic printing machine according to any one of claims 1 to 5, wherein: the printing roller assembly comprises a printing roller and a printing gear arranged on one side of the printing roller, the printing roller assembly comprises a printing roller and printing roller discs arranged on two sides of the printing roller, the anilox roller assembly comprises an ink box and an anilox roller for smearing ink in the ink box on the printing roller, the gear transmission mechanism comprises a printing motor arranged on a printing frame and used for driving the printing roller to rotate, a printing roller gear arranged at the position, corresponding to the printing gear, of the printing roller and an anilox gear arranged at one end, corresponding to the printing roller, of the printing roller, the printing roller gear is meshed with the printing gear and the anilox gear respectively, and the position, corresponding to the printing roller, of the deviation correcting frame is provided with a printing roller pressure adjusting device for adjusting the pressure between the printing roller and a locking rotating device for fixing the printing roller discs.

7. The offset printing apparatus of a flexographic printing machine according to claim 6, wherein: the printing roller pressure adjusting device comprises a printing adjusting block arranged at one end of the deviation correcting frame and corresponding to the printing roller, a printing pressure adjusting screw arranged at one side of the printing adjusting block, an anilox adjusting block arranged at one end of the deviation correcting frame and corresponding to the anilox roller, and an anilox pressure adjusting screw arranged at one side of the anilox adjusting block, wherein one ends of the printing adjusting block and the anilox adjusting block are hinged with the deviation correcting frame through a hinge shaft, the other ends of the printing adjusting block and the anilox adjusting block respectively correspond to the ends of the printing pressure adjusting screw and the anilox pressure adjusting screw, the printing adjusting block and the anilox adjusting block jointly support a roller disc, and the printing adjusting block and/or the anilox adjusting block are driven to rotate along the hinge shaft as a fulcrum through rotation of the printing pressure adjusting screw and a gap between the printing roller and the anilox roller.

8. The offset printing apparatus of a flexographic printing machine according to claim 7, wherein: the printing roller is characterized in that an emergency separating mechanism for controlling the axial lifting of the printing roller is arranged at the position, corresponding to the printing roller, of the deviation correcting rack, the emergency separating mechanism comprises a separating swing rod and a separating cylinder, the separating swing rod is arranged on the deviation correcting rack, one end of the separating swing rod is hinged to the deviation correcting rack, the other end of the separating swing rod is connected with the output end of the separating cylinder, and the hinge shaft is connected with the separating swing rod and drives the printing roller to be close to or far away from the printing roller and/or the anilox roller through the separating cylinder.

9. The offset printing apparatus of a flexographic printing machine according to claim 8, wherein: the locking rotating device comprises locking air cylinders arranged at two ends of the deviation correcting frame corresponding to the plate roller disc and locking grooves formed in the surface of the plate roller disc, and locking rods which enter or leave the locking grooves are arranged at the output ends of the locking air cylinders.

10. The offset printing apparatus of a flexographic printing machine according to claim 9, wherein: the anilox roller assembly further comprises an ink box swinging frame and an ink transfer roller, the ink box is arranged on the ink box swinging frame, the anilox roller is arranged above the ink box and is in offset rotation with the ink box through the ink transfer roller, the ink box swinging frame is rotationally connected to a deviation rectifying support through an ink box rotating shaft, ink box locking cylinders are arranged on two sides of the ink box swinging frame by the deviation rectifying support, the ink box swinging frame is close to or far away from the printing roller by taking the ink box rotating shaft as a supporting point, and the ink box swinging frame is fixed on the deviation rectifying support through the ink box locking cylinders.