Environment-friendly offset printing machine with light oil and printing method thereof

Abstract

The application relates to the technical field of offset printing machines, in particular to an environment-friendly varnish offset printing machine and a printing method thereof. The environment-friendly varnish offset printing machine comprises a printing machine body, a paper feeding frame is fixed on the feeding side of the printing machine body, a lifting plate is arranged in the paper feeding frame, a sliding plate is arranged on the top surface of the lifting plate, a base is arranged on the top surface of the sliding plate, a paper stack is arranged on the base, telescopic frames are symmetrically arranged on the front side of the paper feeding frame, clamping arms are rotationally arranged at one end of the telescopic frames, the telescopic frames are provided with lifting assemblies used for driving the clamping arms to lift, and the clamping arms are provided with locking mechanisms used for fixing and clamping the paper stack. The application has the effect of improving the turnover efficiency of the paper stack.

Description

An environmentally friendly varnish offset printing machine and its printing method Technical Field

[0001] This application relates to the technical field of offset printing machines, and in particular to an environmentally friendly varnish offset printing machine and its printing method. Background Technology

[0002] Offset printing presses are a type of planographic printing press. During printing, the image is first printed onto a rubber roller from a printing plate, and then transferred from the rubber roller onto the paper. Offset printing presses can be classified into sheet-fed offset printing presses and web offset printing presses according to the paper feeding method; and into single-color, two-color, four-color, and multi-color printing presses according to the number of colors printed in one pass.

[0003] The environmentally friendly varnish offset printing machine is a type of sheet-fed offset printing machine. It mainly consists of a paper feeder, a printing press body, and a paper delivery rack. Both the paper feeder and delivery rack are equipped with lifting platforms and paper feeding arms. The paper feeder is fixed to the feed side of the printing press body, and the delivery rack is fixed to the discharge side. When printing is required, multiple sheets of paper are first stacked into a paper stack, which is then placed on a base. A forklift is then used to move the base, along with the paper stack, onto the lifting platform inside the feeder. The lifting platform is then activated until the paper stack is aligned with the paper inlet of the printing press body. After the printing press body is started, the paper feeding arms feed the paper one sheet at a time from top to bottom into the printing press body for printing.

[0004] However, due to the high price of double-sided offset printing machines, some production lines still use single-sided offset printing machines to complete double-sided printing operations. After the paper stack completes its first paper feed, it is first bundled, then flipped using external tools, the bundle is loosened, and finally the flipped paper stack is fed into the paper feed rack. During this flipping process, the high stack height makes bundling difficult, resulting in low flipping efficiency. Summary of the Invention

[0005] To improve the efficiency of paper stack turning, this application provides an environmentally friendly varnish offset printing machine and its printing method.

[0006] Firstly, this application provides an environmentally friendly varnish offset printing machine, which adopts the following technical solution:

[0007] An environmentally friendly varnish offset printing machine includes a printing body. A paper feeder is fixed to the feeding side of the printing body. A lifting plate is provided inside the paper feeder. A sliding plate is provided on the top surface of the lifting plate. A base is provided on the top surface of the sliding plate. A stack of paper is provided on the base. Telescopic frames are symmetrically arranged on the front side of the paper feeder. A clamping arm is rotatably provided at one end of the telescopic frame. The telescopic frame is provided with a lifting assembly for driving the clamping arm to rise and fall. The clamping arm is provided with a locking mechanism for fixing and clamping the stack of paper.

[0008] By adopting the above technical solution, when it is necessary to flip the paper stack, firstly, the sliding plate is slid out of the paper feed rack, then the base along with the paper stack is placed on the sliding plate, then the telescopic frame is adjusted so that the clamping arms abut against both sides of the paper stack, and then the clamping arms are clamped and fixed to the paper stack by the locking mechanism, then the paper stack is lifted by the lifting component, and then the clamping arms are rotated to flip the paper stack. Under the action of the clamping arms, the efficiency of flipping the paper stack is improved.

[0009] Optionally, the lifting assembly includes a lifting member, a connecting seat is provided at one end of the telescopic frame, a first lead screw is rotatably provided inside the connecting seat, a first motor is provided on the top surface of the connecting seat, the output shaft of the first motor is fixedly connected to the first lead screw, the lifting member is slidably connected to the connecting seat, the first lead screw is threadedly connected to the lifting member, the lifting member extends outside the connecting seat and is rotatably connected to the clamping arm.

[0010] By adopting the above technical solution, when the first motor starts, the output shaft of the first motor drives the first lead screw to rotate, the first lead screw drives the lifting component to rise and fall, the lifting component then drives the clamping arm to rise and fall, and the lifting arm finally drives the paper stack to rise and fall, which helps to improve the stability of the paper stack after it is lifted and flipped.

[0011] Optionally, the clamping arm includes a clamping seat and two clamping rods. A gear is rotatably disposed inside the clamping seat. The two clamping rods pass through the clamping seat and are symmetrically disposed on both sides of the gear. Teeth are provided on the opposite side of the two clamping rods. The two clamping rods mesh with the gear through the teeth. The locking mechanism is disposed at one end of each of the two clamping rods. The lifting component is provided with a rotating assembly for driving the clamping arm to rotate.

[0012] By adopting the above technical solution, when the rotating component drives the gear to rotate, the gear drives the two clamping rods to move in opposite directions under the meshing action of the teeth and the gear. The two clamping rods moving in opposite directions are conducive to adapting to paper stacks of different heights and improving the applicability of the clamping arm.

[0013] Optionally, the locking mechanism includes a locking rod and a top seat. The top seat is disposed on the top surface of the paper stack. One end of the clamping rod is provided with a locking seat. The middle part of the locking rod is hinged to the side wall of the locking seat. Both the side wall of the top seat and the base are provided with locking heads. The locking rod is locked with the locking heads. The locking seat is provided with a swinging component for driving the locking rod to swing.

[0014] By adopting the above technical solution, when it is necessary to clamp and fix the clamping arm to the paper stack, the top seat is first pressed on the top surface of the paper stack, and then the clamping rod is moved towards the lock head by adjusting the telescopic frame, so that the lock seat is aligned and fits against the lock head. Then, the locking rod is driven to swing by the swinging component. At this time, the locking rod locks the lock head. Under the joint clamping of the two clamping rods, the paper stack is fixedly clamped between the top seat and the base, which helps to improve the stability of the paper stack during subsequent flipping.

[0015] Optionally, the swing assembly includes a push rod and a spring. The spring is disposed on the side wall of the lock seat, one end of the spring is connected to the lock rod, and the other end of the spring is connected to the side wall of the lock seat. The push rod is inserted into the lock seat, one end of the push rod abuts against the lock rod, and the other end of the push rod extends into the lock seat. A ratchet is rotatably disposed inside the lock seat, and the other end of the push rod abuts against the ratchet teeth of the ratchet.

[0016] By adopting the above technical solution, due to the characteristics of the ratchet and the push rod abutting against the ratchet teeth, when the ratchet rotates, the ratchet teeth drive the push rod to move horizontally, and the push rod drives the locking rod to swing. During the swinging process of the locking rod, the locking rod squeezes or releases the spring, so that the push rod continuously abuts against the ratchet teeth, which helps to improve the stability of the locking rod locking the lock head.

[0017] Optionally, the rotating assembly includes a worm gear and a worm. A rotating shaft is rotatably provided on the outer side of the lifting member. The end of the rotating shaft away from the lifting member is fixedly connected to the clamping seat. A second motor is provided on the outer side of the lifting member. The worm is fixedly connected to the output shaft of the second motor. The worm gear is fixedly sleeved on the rotating shaft, and the worm gear meshes with the worm.

[0018] By adopting the above technical solution, when the second motor starts, the output shaft of the second motor rotates the worm gear, which drives the worm wheel to rotate, and the worm wheel drives the rotating shaft to rotate. The rotating shaft then drives the clamping seat to rotate, and the clamping seat finally drives the paper stack to flip through the clamping rod. At the same time, since the worm wheel and worm gear have self-locking properties, when the second motor stops driving, the clamping arm can keep the paper stack stationary in its current state, thereby reducing the chance of the paper stack shaking during the flipping process and causing accidental injury to the staff.

[0019] Optionally, the top seat has sliding grooves on both sides, and a slider is slidably disposed in the sliding grooves. An auxiliary telescopic arm is hinged to one side of the slider, and the end of the auxiliary telescopic arm away from the slider is fixedly connected to the base by bolts.

[0020] By adopting the above technical solution, when the top seat is pressed against the top surface of the paper stack, the auxiliary telescopic arm can be taken out from the slide groove of the top seat, and then the auxiliary telescopic arm can be swung to make it fit against the side wall of the paper stack. At the same time, the length of the auxiliary telescopic arm can be stretched and adjusted according to the height of the paper stack. Then, the auxiliary telescopic arm is fixedly connected to the base with bolts. At this time, the auxiliary telescopic arm is fixed to one side of the paper stack and works with the clamping arm to fix and clamp the paper stack, reducing the possibility of the paper stack becoming loose during the flipping process.

[0021] Optionally, a pressure seat is provided on one side of the clamping seat, and the pressure seat has a slot, through which the lock head is inserted into the pressure seat.

[0022] By adopting the above technical solution, when the clamping arm is fixedly clamped to the paper stack, the clamping seat abuts against the side wall of the paper stack through the pressure seat, forming support for the paper stack and reducing the loosening of the paper stack when it is turned over. When the paper stack is fed into the feed rack, the top seat or base can be installed at the entrance of the feed rack to form a fence. At this time, the telescopic frame can be adjusted, and the telescopic frame drives the clamping seat to move closer to the top seat or base, and the lock head is inserted into the slot. This helps to reduce the random placement of the top seat or base and provides a warning function, reducing the situation where workers accidentally enter the feed rack after the lifting plate is raised.

[0023] Optionally, the telescopic frame includes a first sub-frame and a second sub-frame, the first sub-frame being disposed on the front side of the paper feeder, the second sub-frame being hinged to the end of the first sub-frame away from the paper feeder, and the connecting seat being disposed on the end of the second sub-frame away from the first sub-frame.

[0024] By adopting the above technical solution, when the first sub-frame is started, the first sub-frame extends and adjusts the distance between the clamping arm and the paper feeder. When the second sub-frame is started, the second sub-frame extends and adjusts the distance between the clamping arm and the paper stack, which helps to improve the stability of the clamping arm in clamping and fixing the paper stack.

[0025] On the other hand, this application provides a printing method for an environmentally friendly varnish offset printing machine, comprising the following steps:

[0026] Open the telescopic frame, slide the sliding plate on the top surface of the lifting plate out of the paper feed rack, and place the paper stack on the lifting plate;

[0027] Adjust the position of the telescopic frame and clamp the clamping arms on both sides of the paper stack, while fixing the clamping arms to the paper stack by the locking mechanism;

[0028] The clamping arm is raised by the lifting assembly and then rotated, thereby flipping the paper stack and completing the flipping of the paper stack.

[0029] After the paper stack is placed on the sliding plate by the lifting assembly, the locking mechanism is released, the sliding plate is reset to the top surface of the lifting plate, and finally the flipped paper stack is transported to the printing machine body by the lifting plate.

[0030] In summary, this application includes the following beneficial technical effects:

[0031] When it is necessary to flip the paper stack, first slide the sliding plate out of the paper feed rack, then place the base along with the paper stack on the sliding plate. Next, adjust the telescopic frame so that the clamping arms abut against both sides of the paper stack. Then, use the locking mechanism to clamp and fix the clamping arms to the paper stack. Then, use the lifting assembly to lift the paper stack, and then rotate the clamping arms to flip the paper stack. The action of the clamping arms helps to improve the efficiency of paper stack flipping. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the overall structure of the environmentally friendly varnish offset printing machine of this application;

[0033] Figure 2 is a schematic diagram of the overall structure of the lifting plate and sliding plate of this application;

[0034] Figure 3 is a schematic diagram of the overall structure of the telescopic frame and clamping arm of this application;

[0035] Figure 4 is a schematic diagram of the overall structure of the clamping arm and lifting assembly of this application;

[0036] Figure 5 is a schematic diagram of the locking mechanism and the lock head of this application.

[0037] Figure 6 is a cross-sectional view of the lock base of this application;

[0038] Figure 7 is a schematic diagram of the overall structure of the top seat and base seat clamping the paper stack in this application;

[0039] Figure 8 is a schematic diagram of the top seat of this application when it is used as a fence.

[0040] Explanation of reference numerals in the attached drawings: 1. Printing machine body; 2. Paper feeder; 3. Lifting plate; 4. Sliding plate; 5. Base; 6. Paper stack; 7. Telescopic frame; 8. Clamping arm; 9. Third motor; 10. Second lead screw; 11. Guide block; 12. First sub-frame; 13. Second sub-frame; 14. Lifting component; 15. Connecting seat; 16. First motor; 17. First lead screw; 18. Clamping seat; 19. Clamping rod; 20. Gear; 21. Tooth; 22. Locking rod; 23. Top seat; 24. Locking seat; 25. Lock head; 26. Push rod; 27. Spring; 28. Ratchet; 29. ​​Turning handle; 30. Worm gear; 31. Worm; 32. Rotating shaft; 33. Second motor; 34. Slide groove; 35. Slider; 36. Auxiliary telescopic arm; 37. Pressure seat; 38. Slot. Detailed Implementation

[0041] The present application will be further described in detail below with reference to Figures 1-8.

[0042] Example:

[0043] Referring to Figures 1 and 2, an environmentally friendly varnish offset printing machine includes a printing body 1. In this embodiment, the printing body 1 is an environmentally friendly varnish offset printing machine, and the printing body 1 can only perform single-sided offset printing. A paper feeder 2 is fixed on the feeding side of the printing body 1. A lifting plate 3 is installed inside the paper feeder 2, and the lifting plate 3 moves up and down within the paper feeder 2 via a chain. A sliding plate 4 is slidably installed on the top surface of the lifting plate 3, and a base 5 is placed on the top surface of the sliding plate 4, with a stack of paper 6 placed on the base 5. Telescopic frames 7 are symmetrically installed on the front side of the paper feeder 2. A clamping arm 8 is rotatably installed at the end of the two telescopic frames 7 that are close to each other, and each of the two telescopic frames 7 is equipped with a lifting assembly, which is used to drive the clamping arm 8 to move up and down. The clamping arm 8 is equipped with a locking mechanism, which is used to clamp and fix the stack of paper 6.

[0044] After the paper stack 6 completes its first paper feed, it needs to be flipped over for reverse offset printing. First, the sliding plate 4 can be slid out of the paper feed holder 2, and then the paper stack 6, after its first paper feed, can be placed on the sliding plate 4. Next, by adjusting the position of the telescopic frame 7, the clamping arms 8 are positioned against both sides of the paper stack 6, and simultaneously, the locking mechanism secures the clamping arms 8 to both sides of the paper stack 6. Then, the lifting assembly raises the paper stack 6, and after it is raised, the clamping arms 8 are rotated. At this time, the clamping arms 8 drive the paper stack 6 to rotate synchronously, completing the flipping of the paper stack 6.

[0045] Referring to Figure 2, to facilitate the sliding plate 4 sliding on the lifting plate 3, a third motor 9 is fixed to the top surface of the lifting plate 3. The output shaft of the third motor 9 is coaxially fixedly connected to a second lead screw 10. The second lead screw 10 rotates on the top surface of the lifting plate 3 and is threadedly connected to the bottom surface of the sliding plate 4. A guide block 11 is also fixed to the bottom surface of the sliding plate 4, and the guide block 11 is slidably connected to the lifting plate 3.

[0046] When the third motor 9 starts, the output shaft of the third motor 9 drives the second lead screw 10 to rotate. Under the limiting action of the two guide rails, the second lead screw 10 drives the sliding plate 4 to move along the direction of the guide rails and move outside the paper feeder 2.

[0047] Specifically, referring to Figures 1 and 3, the telescopic frame 7 includes a first sub-frame 12 and a second sub-frame 13. Both the first sub-frame 12 and the second sub-frame 13 are folding frames, and after being powered on, the first sub-frame 12 and the second sub-frame 13 can be freely folded and extended. One end of the first sub-frame 12 is fixedly connected to the front side of the paper feeder 2, and one end of the second sub-frame 13 is hinged to the other end of the first sub-frame 12. The clamping arm 8 is rotatably mounted on the other end of the second sub-frame 13.

[0048] The freely foldable and retractable first subframe 12 and second subframe 13 facilitate the adjustment of the position of the clamping arm 8, making it easier for the clamping arm 8 to clamp and fix the paper stack 6.

[0049] Specifically, referring to Figure 4, the lifting assembly includes a lifting member 14. A connecting seat 15 is fixed to the other end of the second sub-frame 13, and the connecting seat 15 has a cavity. A first motor 16 is fixed to the top surface of the connecting seat 15, and a first lead screw 17 is coaxially fixed to the output shaft of the first motor 16, and the first lead screw 17 rotates within the connecting seat 15. In this embodiment, the lifting member 14 is a block, sliding within the connecting seat 15, with the first lead screw 17 threaded through it, and one end of the lifting member 14 extending outside the connecting seat 15. A clamping arm 8 is rotatably mounted on one end of the lifting member 14.

[0050] To flip the paper stack 6, it is necessary to first remove the paper stack 6 from the ground. To do this, when the first motor 16 is driven, the drive shaft of the first motor 16 drives the first lead screw 17 to rotate. Under the constraint of the cavity inside the connecting seat 15, the first lead screw 17 drives the lifting component 14 to rise, the lifting component 14 drives the clamping arm 8 to rise, and the clamping arm 8 thereby drives the paper stack 6 to rise.

[0051] Referring to Figures 3 and 4, to facilitate the fixed clamping of paper stacks 6 of different heights, the clamping arm 8 includes a clamping seat 18 and clamping rods 19. The clamping seat 18 is rectangular and has a cavity inside. The clamping seat 18 is rotatably connected to one end of the lifting member 14. A gear 20 is rotatably connected inside the clamping seat 18. There are two clamping rods 19, which are slidably connected to the clamping seat 18 and symmetrically installed on both sides of the gear 20. One end of each clamping rod 19 extends outside the clamping seat 18, and a locking mechanism is installed at one end of each clamping rod 19. Teeth 21 are fixed on opposite sides of each clamping rod 19, and the two clamping rods 19 mesh with the gear 20 through the teeth 21.

[0052] In practical applications, one of the clamping rods 19 is moved according to the actual height of the paper stack 6. Under the action of the gear 20, the other clamping rod 19 moves synchronously in the opposite direction, thereby adapting to different heights of the paper stack 6.

[0053] Specifically, referring to Figures 5, 6, and 7, the locking mechanism includes locking rods 22 and a top seat 23. The top seat 23 has the same structure as the base 5 and is pressed against the top surface of the paper stack 6. A locking seat 24 is fixed to the side of the clamping rod 19 facing the paper stack 6. There are three locking rods 22, which are installed on the side wall of the locking seat 24, and the middle of the three locking rods 22 is hinged to the outer side wall of the locking seat 24. Lock heads 25 are fixed on both sides of the top seat 23 and the base 5 corresponding to the positions of the locking seat 24. The three locking rods 22 enclose a fixing space for the lock heads 25, and the three locking rods 22 are used to lock the lock heads 25 simultaneously.

[0054] Referring to Figure 6, a swing assembly is installed on the lock seat 24 to facilitate the locking of the lock head 25 by the three locking rods 22. The swing assembly includes a push rod 26 and a spring 27. The number of springs 27 and push rods 26 corresponds to the number of locking rods 22. The locking rod 22 includes a locking end and a swing end. The spring 27 is installed inside the locking end, and one end of the spring 27 is fixedly connected to the locking end of the locking rod 22, while the other end of the spring 27 is fixedly connected to the side wall of the lock seat 24. The push rod 26 slides through the side wall of the lock seat 24. A ratchet 28 is rotatably connected inside the lock seat 24. One end of the push rod 26 abuts against the swing end of the locking rod 22, and the other end of the push rod 26 abuts against the ratchet teeth of the ratchet 28. A handle 29 is rotatably connected to the side of the locking rod 22 away from the paper stack 6, and the handle 29 is coaxially fixedly connected to the ratchet 28.

[0055] When it is necessary to clamp and fix the paper stack 6 with the clamping arm 8, first align the locking seat 24 on one of the clamping rods 19 with and abut against the locking head 25 of the top seat 23, and then align the locking seat 24 on the other clamping rod 19 with and abut against the locking head 25 of the base 5. Next, turn the handle 29, which coaxially drives the ratchet 28 to rotate. Due to the structural characteristics of the ratchet 28, the ratchet 28 drives the push rod 26 to move outward from the locking seat 24 through the ratchet teeth. The push rod 26 then pushes the swing end of the locking rod 22. At this time, the locking rod 22 compresses the spring 27 and locks the locking head 25.

[0056] To prevent the throttle 29 from becoming loose, a pin can be installed in practical applications. The pin passes through the throttle 29 and the clamping rod 19 in sequence, thereby preventing the throttle 29 from becoming loose.

[0057] Referring to Figures 3 and 4, to facilitate the rotation of the clamping arm 8, the lifting component 14 is equipped with a rotating assembly, which includes a worm gear 30 and a worm 31. A rotating shaft 32 is rotatably connected to one side of the lifting component 14 extending outside the connecting seat 15, and the end of the rotating shaft 32 away from the lifting component 14 is fixedly connected to the center of the clamping seat 18. A second motor 33 is also fixedly mounted on the side of the lifting component 14 extending outside the connecting seat 15, and the output shaft of the second motor 33 is coaxially fixedly connected to the worm 31. The worm gear 30 is fixedly sleeved on the side wall of the rotating shaft 32, and the worm gear 30 meshes with the worm 31.

[0058] When the second motor 33 starts, its output shaft drives the worm gear 31 to rotate, which in turn drives the worm wheel 30 to rotate. The worm wheel 30 then drives the rotating shaft 32 to rotate, which in turn drives the clamping seat 18 to rotate. The clamping seat 18, through the clamping rod 19, ultimately causes the paper stack 6 to flip. It is important to note that because the worm wheel 30 and worm gear 31 are self-locking, if the second motor 33 suddenly stops driving while the paper stack 6 is flipping, the paper stack 6 can remain stationary in its current state. This reduces the likelihood of the paper stack 6 shaking during flipping and potentially injuring workers.

[0059] It should be noted that, referring to Figure 7, to reduce the loosening of the paper stack 6 during the flipping process when the clamping arm 8 is used, the other two sides of the top base 23 are respectively provided with sliding grooves 34. A slider 35 is slidably connected in the sliding grooves 34, and an auxiliary telescopic arm 36 is hinged to the outside of the slider 35. The auxiliary telescopic arm 36 is used to support the other side of the paper stack 6 in conjunction with the clamping arm 8, and the end of the auxiliary telescopic arm 36 away from the slider 35 is fixedly connected to the base 5 by bolts.

[0060] After the top seat 23 is pressed onto the top surface of the paper stack 6, the auxiliary telescopic arm 36 is taken out from the slide groove 34, and then the auxiliary telescopic arm 36 is stretched according to the height of the paper stack 6. Finally, the auxiliary telescopic arm 36 is fixed to the base 5 with bolts. At this time, the auxiliary telescopic arm 36 abuts against the side wall of the paper stack 6, thereby supporting the flipping of the paper stack 6.

[0061] It is worth mentioning that, referring to Figures 4 and 8, the top seat 23 not only serves to press the paper stack 6, but can also be used as a fence. The clamping seat 18 is fixed with a pressing seat 37 on the side facing the paper stack 6. The pressing seat 37 has a slot 38 on the side facing the paper stack 6, and the pressing seat 37 is inserted into the lock head 25 through the slot 38.

[0062] When the paper stack 6 is being fed into the paper feed rack, to reduce the risk of workers accidentally entering the paper feed rack 2 and being injured by the lifting plate 3, the top seat 23 is first placed on one side of the two second sub-racks 13, and then the second sub-racks 13 are extended simultaneously. The second sub-racks 13 eventually drive the pressure seat 37 to be fitted onto the lock head 25, and the top seat 23 is fixed between the two second sub-racks 13, thus serving as a barrier and warning. It also facilitates the placement of the top seat 23, reducing the possibility of the top seat 23 being piled up randomly.

[0063] This embodiment also provides a printing method for an environmentally friendly varnish offset printing machine, which includes the following steps:

[0064] First, extend the first sub-frame 12 and open the second sub-frame 13. Then start the third motor 9. The output shaft of the third motor 9 drives the second lead screw 10 to rotate. Under the action of the guide block 11, the sliding plate 4 slides out of the paper feed rack 2 from the lifting plate 3. Then, along with the base 5, place the paper stack 6 that has finished feeding the first paper onto the top surface of the sliding plate 4.

[0065] Then, adjust the positions of the first sub-frame 12 and the second sub-frame 13 in sequence so that the clamping arm 8 is aligned with both sides of the paper stack 6. Next, move the clamping rod 19 according to the actual height of the paper stack 6 so that the locking seat 24 is aligned with the locking head 25. Then, turn the handle 29, which coaxially drives the ratchet 28 to rotate. The ratchet 28 drives the push rod 26 to move through the ratchet teeth. The push rod 26 then drives the locking rod 22 to swing, thereby locking the locking head 25 and completing the clamping and fixing of the clamping arm 8 with the top seat 23, the base 5, and the paper stack 6.

[0066] Next, the first motor 16 is started. The output shaft of the first motor 16 drives the first lead screw 17 to rotate. The first lead screw 17 drives the lifting component 14 to rise. The lifting component 14 drives the clamping seat 18 to rise. The clamping seat 18 then drives the top seat 23, the base 5, and the paper stack 6 to rise through the clamping arm 8. Then, the second motor 33 is started. The output shaft of the first motor 16 drives the worm gear 31 to rotate. The worm gear 31 drives the worm wheel 30 to rotate. The worm wheel 30 then drives the clamping arm 8 to rotate through the rotating shaft 32. The clamping arm 8 then drives the paper stack 6 to rotate, completing the flipping of the paper stack 6.

[0067] The paper stack 6 is reset sequentially. First, the paper stack 6 is lowered onto the sliding plate 4. Then, the locking of the top seat 23 and the base 5 is released. Finally, the paper stack 6 is sent back into the middle paper feeder 2.

[0068] In summary, by using the clamping arms 8 to fix the paper stack 6 between the top seat 23 and the base 5, and then rotating the clamping arms 8 to flip the paper stack 6, the flipping efficiency of the paper stack 6 can be improved.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An environmentally friendly varnish offset printing machine, comprising a printing body (1), wherein a paper feeder (2) is fixed on the feeding side of the printing body (1), and a lifting plate (3) is provided inside the paper feeder (2), characterized in that: The top surface of the lifting plate (3) is provided with a sliding plate (4), the top surface of the sliding plate (4) is provided with a base (5), and a paper stack (6) is provided on the base (5). A telescopic frame (7) is symmetrically arranged on the front side of the paper feeder (2). A clamping arm (8) is rotatably provided at one end of the telescopic frame (7). The telescopic frame (7) is provided with a lifting assembly for driving the clamping arm (8) to rise and fall. The clamping arm (8) is provided with a locking mechanism for fixing and clamping the paper stack (6). A third motor (9) is fixed on the top surface of the lifting plate (3). The output shaft of the third motor (9) is coaxially fixedly connected to a second lead screw (10). The second lead screw (10) rotates at... The top surface of the lifting plate (3) and the second lead screw (10) are threadedly connected to the bottom surface of the sliding plate (4). The bottom surface of the sliding plate (4) is also fixed with a guide block (11), and the guide block (11) is slidably connected to the lifting plate (3). The lifting assembly includes a lifting component (14). One end of the telescopic frame (7) is provided with a connecting seat (15). A first lead screw (17) is rotatably provided inside the connecting seat (15). A first motor (16) is provided on the top surface of the connecting seat (15). The output shaft of the first motor (16) is fixedly connected to the first lead screw (17). The lifting component (14) is slidably connected to the connecting seat (15). The first lead screw (17) is slidably connected to the bottom surface of the sliding plate (4). 17) Threaded connection with the lifting member (14), the lifting member (14) extends outside the connecting seat (15) and is rotatably connected with the clamping arm (8); the clamping arm (8) includes a clamping seat (18) and two clamping rods (19), a gear (20) is rotatably arranged inside the clamping seat (18), the two clamping rods (19) respectively pass through the clamping seat (18), the two clamping rods (19) are symmetrically arranged on both sides of the gear (20), teeth (21) are provided on the opposite side of the two clamping rods (19), the two clamping rods (19) respectively mesh with the gear (20) through the teeth (21), the locking mechanism is divided into The lifting member (14) is provided with a rotating assembly for driving the clamping arm (8) to rotate, and the rotating assembly includes a worm gear (30) and a worm (31). A rotating shaft (32) is rotatably provided on the outer side of the lifting member (14). The end of the rotating shaft (32) away from the lifting member (14) is fixedly connected to the clamping seat (18). A second motor (33) is provided on the outer side of the lifting member (14). The worm (31) is fixedly connected to the output shaft of the second motor (33). The worm gear (30) is fixedly sleeved on the rotating shaft (32). The worm gear (30) meshes with the worm (31).The telescopic frame (7) includes a first sub-frame (12) and a second sub-frame (13). The first sub-frame (12) is located on the front side of the paper feeder (2), and the second sub-frame (13) is hinged to the end of the first sub-frame (12) away from the paper feeder (2). The connecting seat (15) is located at the end of the second sub-frame (13) away from the first sub-frame (12).

2. The environmentally friendly varnish offset printing machine according to claim 1, characterized in that: The locking mechanism includes a locking rod (22) and a top seat (23). The top seat (23) is disposed on the top surface of the paper stack (6). One end of the clamping rod (19) is provided with a locking seat (24). The middle part of the locking rod (22) is hinged to the side wall of the locking seat (24). The side walls of the top seat (23) and the base (5) are both provided with locking heads (25). The locking rod (22) is locked with the locking heads (25). The locking seat (24) is provided with a swinging component for driving the locking rod (22) to swing.

3. The environmentally friendly varnish offset printing machine according to claim 2, characterized in that: The swing assembly includes a push rod (26) and a spring (27). The spring (27) is disposed on the side wall of the lock seat (24). One end of the spring (27) is connected to the lock rod (22), and the other end of the spring (27) is connected to the side wall of the lock seat (24). The push rod (26) is inserted into the lock seat (24). One end of the push rod (26) abuts against the lock rod (22), and the other end of the push rod (26) extends into the lock seat (24). A ratchet (28) is rotatably disposed inside the lock seat (24), and the other end of the push rod (26) abuts against the ratchet teeth of the ratchet (28).

4. The environmentally friendly varnish offset printing machine according to claim 2, characterized in that: The top seat (23) has sliding grooves (34) on both sides, and a slider (35) is slidably arranged in the sliding grooves (34). An auxiliary telescopic arm (36) is hinged to one side of the slider (35), and the end of the auxiliary telescopic arm (36) away from the slider (35) is fixedly connected to the base (5) by bolts.

5. The environmentally friendly varnish offset printing machine according to claim 2, characterized in that: A pressure seat (37) is provided on one side of the clamping seat (18), and the pressure seat (37) has a slot (38) through which the lock head (25) is inserted into the pressure seat (37).

6. A printing method for an environmentally friendly varnish offset printing machine, based on any one of claims 1-5, comprising the following steps: opening the telescopic frame (7), sliding the sliding plate (4) on the top surface of the lifting plate (3) outside the paper feeder (2), and placing the paper stack (6) on the lifting plate (3); adjusting the position of the telescopic frame (7), and clamping the clamping arms (8) on both sides of the paper stack (6), while simultaneously locking the clamping arms (8) to the paper stack (6) through the locking mechanism. The stack (6) is fixed; the clamping arm (8) is raised by the lifting assembly, and then the clamping arm (8) is rotated, thereby flipping the paper stack (6) and completing the flipping of the paper stack (6); then the paper stack (6) is placed on the sliding plate (4) by the lifting assembly, the locking mechanism is released, the sliding plate (4) is reset to the top surface of the lifting plate (3), and finally the flipped paper stack (6) is transported to the printing machine body (1) by the lifting plate (3).

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