Rotary paper feeding structure

Abstract

A rotary paper feeding structure comprises a supporting frame, a clamping component, a driving component and a rotating component, the clamping component, the driving component and the rotating component are arranged on the supporting frame, the driving component can drive the clamping component to horizontally move on the supporting frame, and the clamping component can clamp paper under the cooperation of the driving component. The rotating component can drive the supporting frame and the clamping component to rotate in the horizontal direction, and therefore the paper clamped by the clamping component can be adjusted in the front-back direction. According to the rotary paper feeding structure, the front-back direction adjustment of paper can be automatically achieved, the problem that the front-back direction of the paper is not consistent in the actual production process is solved, the conditions of manual paper detection and manual adjustment are reduced, the production efficiency is greatly improved, the labor intensity is reduced, and the production cost is reduced. Therefore, the production or paper feeding process is more coherent, and the working efficiency and the stability of continuous work are improved.

Description

Technical Field

[0001] The utility model belongs to the field of printing machinery, and particularly relates to a rotary paper loading structure. Background Art

[0002] For the paper with front and back sides pasted by the existing paper pasting machine, it has to go through the drying process before die cutting. However, during the drying process of the paper, it often bends and deforms to varying degrees, which will seriously affect the paper feeding work of the die cutting machine. Therefore, it is necessary to stack the paper in piles with the front and back sides facing correctly manually or by a paper turning machine to offset the deformation amount and reduce the bending degree during the drying process. However, in the die cutting process of the paper, it is required that the paper sent by the paper feeding system must have the same paper surface orientation, which may be face up or face down, and the front and back directions of the paper feeding by the paper feeding system must also be the same, that is, the front and back orientations are the same and the front and back directions are also the same. For example, the paper conveyed by the paper feeding system has the front side with a pattern facing up, and it is also required that the front and back orientations of the pattern are the same. In the prior art, a patent document with the publication number CN112660864A discloses a reverse turning paper feeding mechanism and its working method, which solves the problem of the same front and back orientations of the paper through the reverse turning paper feeding mechanism. And a patent document with the publication number CN 112850247A discloses a paper feeding mechanism with paper recognition function and its working method. The recognition system disclosed in this patent can identify the front and back states of the paper and make a judgment, and the control system controls the turning mechanism to turn the paper to achieve the unification of the front and back sides of the paper. However, in the actual use and operation process, even after the paper orientations are the same, there may still be a situation where the front and back directions of the papers with the same orientation are inconsistent. In this case, manual horizontal rotation is still required to make the front and back directions of the papers with the same front and back orientations also consistent so that they can enter the paper feeding system of the die cutting machine. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a rotary paper loading mechanism to solve the technical problem of how to keep the front and back directions of the paper in the paper feeding system consistent on the premise that the front and back sides of the paper are the same.

[0004] To achieve the above purpose, the specific technical solution of the rotary paper loading structure of the utility model is as follows:

[0005] A rotary paper loading structure includes a support frame, and a clamping component, a driving component and a rotating component arranged on the support frame. The driving component can drive the clamping component to move horizontally on the support frame. The clamping component can clamp the paper in cooperation with the driving component. The rotating component can drive the support frame and the clamping component to rotate in the horizontal direction, so as to adjust the front and back directions of the paper clamped by the clamping component.

[0006] The support frame includes a support beam, a connecting plate is fixedly connected to the upper end of the support beam, a horizontal guide beam is fixedly connected to the lower end of the support beam, the connecting plate is used to be fixedly connected to the rotating component, and clamping components are slidably provided on the horizontal guide beams on the left and right sides, respectively, and the clamping components can move horizontally along the horizontal guide beam under the action of the driving component;

[0007] The sprocket wheel is annularly connected to the sprocket wheel, and the sprocket wheel is adjacent to the gear train, and the sprocket wheel is located adjacent to the gear train, and the sprocket wheel is adjacent to the gear train, and the sprocket wheel is adjacent to the gear train.

[0008] Furthermore, the driving component includes a servo motor fixedly mounted on the supporting frame, a sprocket is provided at the output end of the servo motor, and also includes a connecting sleeve arranged between the horizontal guide beams, and the connecting sleeve is also fixedly provided with a sprocket, the servo motor and the connecting sleeve are connected through the sprocket and the chain connecting the two sprockets, the servo motor can drive the connecting sleeve to rotate through the sprocket and the chain, the two ends of the connecting sleeve are respectively fixedly connected with a screw rod, the screw rods on both sides are respectively connected to the adjustment bracket of the clamping component, the two ends of the adjustment bracket are respectively provided with a first slider, the adjustment bracket is slidably connected to the horizontal guide beams at both ends through the first slider, in addition, one side of the screw rods on both sides is a left-handed screw rod and the other side is a right-handed screw rod, and at the same time, the adjustment bracket is threadedly connected to the screw rod through a nut fixedly provided on the adjustment bracket.

[0009] Furthermore, a second slider is fixedly provided on the outer side of the adjustment bracket of the clamping component, and a lifting slide bar is slidably connected to the second slider, and the lifting slide bar can move up and down along the second slider, and a support plate is fixedly connected to the bottom of the lifting slide bar, and the support plate is horizontally arranged, and the lifting slide bar is fixedly connected to the side of the support plate. In addition, a first lifting cylinder is also fixedly installed on the adjustment bracket on the same side of the lifting slide bar, and the end of the piston rod of the first lifting cylinder is fixedly connected to the side plate of the support plate. The up and down movement of the piston rod of the first lifting cylinder can drive the lifting slide bar and the support plate to move up and down synchronously. In addition, a second lifting cylinder is also fixedly installed on the inner side of the adjusting bracket, and the end of the piston rod of the second lifting cylinder is fixedly connected to a pressure plate, and the pressure plate is located above the support plate.

[0010] Furthermore, a paper pushing component is also provided. The paper pushing component includes a fixed slider fixedly installed on the front side of the support frame. The fixed slider is slidably connected with a lifting guide rod, and the lifting guide rod can slide up and down along the fixed slider. A paper pushing plate is fixedly connected to the lower end of the lifting guide rod. At the same time, a third lifting cylinder is also fixedly installed on the front side of the support frame. The end of the piston rod of the third lifting cylinder is also fixedly connected to the paper pushing plate. The third lifting cylinder provides corresponding power for the up and down movement of the paper pushing plate.

[0011] Furthermore, the same-side ends of the horizontal guide beam are fixedly connected through a reinforcing plate. The end parts of the lead screws on both sides of the connecting sleeve are respectively rotatably connected with the reinforcing plate through bearings and shaft seats; A protective tube is also arranged on the outer side of the rotating shaft. The upper end of the protective tube is fixedly connected to the fixed plate. There is a gap between the lower end of the protective tube and the upper end surface of the connecting plate. At the same time, a shaft sleeve is installed between the rotating shaft and the protective tube; The side of the supporting plate close to the paper is provided with an inclined edge that slopes downward.

[0012] A rotary paper feeding structure of the present utility model has the following advantages: The rotary paper feeding structure of the present application can automatically adjust the front and back directions of the paper, solves the problem of inconsistent front and back directions of the paper existing in the actual production process, reduces the situation of manual paper inspection and manual adjustment, greatly improves the production efficiency, reduces the labor intensity, makes the production or paper feeding process more coherent, and improves the work efficiency and the stability of continuous work. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a front-side and side structure schematic diagram of the present utility model;

[0014] Figure 2 is a rear-side structure schematic diagram of the present utility model;

[0015] Figure 3 is a structure schematic diagram of the support frame of the present utility model;

[0016] Figure 4 is a connection structure schematic diagram of the driving component and the clamping component of the present utility model;

[0017] Figure 5 is a connection structure schematic diagram of the clamping component and the support frame of the present utility model;

[0018] Figure 6 is a structure schematic diagram of the clamping component of the present utility model;

[0019] Figure 7 is a structure schematic diagram of the rotating component of the present utility model;

[0020] Figure 8 is a cross-sectional view of the rotating component of the present utility model;

[0021] Figure 9 Schematic structural diagram of the paper pushing component of the present utility model;

[0022] Explanation of the markings in the figure: 1. Support frame; 11. Support beam; 12. Connecting plate; 13. Horizontal guide beam; 2. Clamping component; 21. Adjusting bracket; 22. First slider; 23. Second slider; 24. Lifting slide bar; 25. Support plate; 26. First lifting cylinder; 27. Second lifting cylinder; 28. Pressure plate; 29. Nut; 3. Driving component; 31. Servo motor; 32. Chain; 33. Connecting sleeve; 34. Lead screw; 4. Rotating component; 41. Fixed plate; 42. Rotating drive cylinder; 43. Fixed bracket; 44. Rack; 45. Straight gear; 46. Shaft head; 47. Rotating shaft; 48. Bush; 49. Protective tube; 5. Paper pushing component; 51. Lifting guide rod; 52. Paper pushing plate; 53. Third lifting cylinder. Specific implementation mode

[0023] In order to better understand the purpose, structure and function of the present utility model, the following further describes in detail a rotating paper feeding structure of the present utility model with reference to the accompanying drawings.

[0024] As Figures 1-9 shown, the rotating paper feeding structure of the present utility model includes a support frame 1, a clamping component 2 is arranged on the support frame 1, and in addition, a driving component 3 is also installed on the support frame 1. The driving component 3 can drive the clamping component 2 to move horizontally on the support frame 1. The clamping component 2 can clamp the paper under the cooperation of the driving component 3. In addition, a rotating component 4 is arranged on the upper part of the support frame 1. The rotating component 4 can drive the support frame 1 and the clamping component 2 to rotate in the horizontal direction, so as to realize the adjustment of the front and back directions of the paper clamped by the clamping component 2. Adding the rotating paper feeding mechanism of the present application to the paper feeding mechanism in the prior art, and cooperating with the flipping component in the paper feeding mechanism can realize the adjustment of the front and back sides and the front and back directions of the paper.

[0025] Specifically, as Figures 3-4 shown, the support frame 1 includes a support beam 11, a connecting plate 12 is fixedly connected to the upper end of the support beam 11, a horizontal guide beam 13 is fixedly connected to the lower end of the support beam 11, the horizontal guide beam 13 extends to the left and right sides of the support beam 11 respectively, and the same-side ends of the horizontal guide beam 13 are fixedly connected through a reinforcing plate. The connecting plate 12 is used for fixedly connecting with the rotating component 4, and the clamping component 2 is slidably arranged on the left and right horizontal guide beams 13 respectively. Under the action of the driving component 3, the clamping component 2 can move horizontally along the horizontal guide beam 13.

[0026] Specifically, as Figures 4-6As shown, the driving component 3 includes a servo motor 31 fixedly mounted on the supporting frame 1, a sprocket is provided at the output end of the servo motor 31, and also includes a connecting sleeve 33 arranged between the horizontal guide beams 13, and a sprocket is also fixedly provided on the connecting sleeve 33. The servo motor 31 and the connecting sleeve 33 are connected to each other through a sprocket and a chain 32 connecting the two sprockets. The servo motor 31 can drive the connecting sleeve 33 to rotate through the sprocket and the chain 32. The two ends of the connecting sleeve 33 are respectively fixedly connected with a screw rod 34, and the screw rods 34 on both sides are respectively connected to the adjustment bracket 21 of the clamping component 2, and the two ends of the adjustment bracket 21 are respectively provided with a first slider 2 2. The adjustment bracket 21 is slidably connected to the horizontal guide beams 13 at both ends through the first slider 22. In addition, one side of the screw rods 34 is a left-hand screw rod 34 and the other side is a right-hand screw rod 34. At the same time, the adjustment bracket 21 is threadedly connected to the screw rod 34 through a nut 29 fixedly set on the adjustment bracket 21, that is, the connecting sleeve 33 of the driving component 3 drives the screw rods 34 on both sides to rotate synchronously, so that the adjustment brackets 21 on both sides can move synchronously toward each other along the direction of the horizontal guide beam 13. The ends of the screw rods 34 on both sides are respectively rotatably connected to the reinforcing plate through bearings and the shaft seat. The reinforcing plate provides support for the screw rod 34, so that the rotation of the screw rod 34 is more stable. A second slide block 23 is fixedly arranged on the outer side of the adjustment bracket 21, and a lifting slide bar 24 is slidably connected to the second slide block 23, and the lifting slide bar 24 can move up and down along the second slide block 23, and a support plate 25 is fixedly connected to the bottom of the lifting slide bar 24, and the support plate 25 is horizontally arranged, and the lifting slide bar 24 is fixedly connected to the side edge of the support plate 25. In addition, a first lifting cylinder 26 is also fixedly installed on the adjustment bracket 21 on the same side of the lifting slide bar 24, and the end of the piston rod of the first lifting cylinder 26 is fixedly connected to the side plate of the support plate 25. The up and down movement of the piston rod of the first lifting cylinder 26 can drive the lifting slide bar 24 and the support plate 25 to move up and down synchronously. In addition, a second lifting cylinder 27 is also fixedly installed on the inner side of the adjustment bracket 21, and the end of the piston rod of the second lifting cylinder 27 is fixedly connected to a pressure plate 28, which is located above the support plate 25, and the position of the pressure plate 28 can also be adjusted by the up and down movement of the piston rod of the second lifting cylinder 27.

[0027] like Figures 7-8As shown, the rotating member 4 is arranged above the connecting plate 12. The rotating member 4 includes a fixing plate 41. On one side of the fixing plate 41, a rotating driving cylinder 42 is fixedly installed. The end of the piston rod of the rotating driving cylinder 42 is fixedly connected with a rack 44. At the corresponding position of the rack 44 on the fixing plate 41, a fixing bracket 43 is fixedly installed. The fixing bracket 43 is in the shape of a square box with one side open. The open side of the fixing bracket 43 is the side corresponding to the teeth of the rack 44. The fixing bracket 43 provides support for the rack 44, making the rack 44 move back and forth more stably under the action of the rotating driving cylinder 42. A rotating shaft 47 is arranged between the connecting plate 12 and the fixing plate 41. The lower end of the rotating shaft 47 is fixedly connected with the connecting plate 12, and the upper end of the rotating shaft 47 can rotate relative to the fixing plate 41. Specifically, the upper end of the rotating shaft 47 passes through the fixing plate 41. At the upper end of the rotating shaft 47, a shaft head 46 is fixedly connected. A spur gear 45 is key-connected to the outside of the shaft head 46. The spur gear 45 meshes with the rack 44. A bearing is installed outside the lower part of the spur gear 45 and the rotating shaft 47. The bearing is also located above the fixing plate. The rack 44 realizes linear motion under the action of the rotating driving cylinder 42, and then drives the spur gear 45 meshing with it to rotate horizontally. The spur gear 45 drives the shaft head 46 and the rotating shaft 47 to rotate. The rotating shaft 47 then drives the connecting plate 12 and the clamping member 2 installed on the support frame 1 to rotate horizontally.

[0028] In addition, a protective tube 49 is also arranged outside the rotating shaft 47. The upper end of the protective tube 49 is fixedly connected with the fixing plate, and there is a certain interval between the lower end of the protective tube 49 and the upper end surface of the connecting plate 12. At the same time, a bushing 48 is installed between the rotating shaft 47 and the protective tube 49. The bushing 48 can play a role in supporting and stabilizing the rotating shaft 47.

[0029] As Figure 1 and Figure 9 shown, a paper pushing member 5 is installed on the front side of the support frame 1. Specifically, the paper pushing member 5 includes a fixed slider fixedly installed on the front side of the support frame 1. The fixed slider is slidably connected with a lifting guide rod 51. The lifting guide rod 51 can slide up and down along the fixed slider. At the lower end of the lifting guide rod 51, a paper pushing plate 52 is fixedly connected. At the same time, a third lifting cylinder 53 is also fixedly installed on the front side of the support frame 1. The end of the piston rod of the third lifting cylinder 53 is also fixedly connected with the paper pushing plate 52. The third lifting cylinder 53 provides corresponding power for the up and down movement of the paper pushing plate 52.

[0030] The rotary paper loading structure of the present application can be installed on the paper feeding mechanism of the current technology for use. For example, for the paper feeding mechanism mentioned in the background technology of the present application, the rotary paper loading mechanism is arranged at the rear side of the flipping mechanism. A moving slider is fixedly arranged on the lower side of the fixing plate 41 of the present application. The moving slider can move back and forth along the corresponding track under the action of the corresponding power device (the power device and the corresponding track here are not drawn in the drawings), that is, the whole rotary paper loading structure moves back and forth as a whole. The control system can control the strokes of the first lifting cylinder 26, the second lifting cylinder 27, the third lifting cylinder 53 and the rotary driving cylinder 42, and can also control the servo motor 31. During the working process of the paper feeding mechanism, the recognition system quickly detects different states of the paper. For those that need to be adjusted for front and back sides, they are adjusted by the flipping mechanism. For those that need to be adjusted in the front and back directions, they are adjusted by this rotary paper loading structure. Specifically, if the paper needs to be adjusted in the front and back directions, the control system controls the rotation of the rotating component 4, rotates the paper pushing component 5 to the side away from the paper, and controls the third lifting cylinder 53 to lower the paper pushing plate 52 to a predetermined position. The control system controls the rotary paper loading structure to move back and forth to the upper side of the paper, so that one side of the paper is attached to the paper pushing plate 52. The control system controls the first lifting cylinder 26 to lower the supporting plate 25 to a predetermined position, and at the same time controls the second lifting cylinder 27 to move its pressing plate 28 up to a predetermined position. Then the servo motor 31 is driven to make the clamping components 2 on both sides move closer to each other, so that the supporting plate 25 of the clamping component 2 moves to the bottom of the paper, and the pressing plate 28 is located above the paper. The control system controls the second lifting cylinder 27 to move downward so that the pressing plate 28 presses on the upper side of the paper, realizing the clamping of the paper by the clamping component 2. After the clamping is completed, the control system controls the movement of the rotary driving cylinder 42 to make the rotating component 4 drive the clamping component 2 and the paper clamped by the clamping component 2 to rotate horizontally, so that the paper rotates 180 degrees, realizing the adjustment of the front and back directions of the paper. After the direction adjustment is completed, the control system controls the second lifting cylinder 27 to raise the pressing plate 28, and at the same time controls the servo motor 31 to move the clamping components 2 away from each other, releasing the clamping of the paper. The control system controls the rotary paper loading structure to move back and forth to the initial position. During the moving process, the paper adjusted in the front and back directions moves forward under the push of the paper pushing plate 52 and continues to flow to the next process. After the rotary paper loading structure moves back and forth to the initial position, the control system controls the paper pushing component 5 to rise to the initial position, completing one adjustment of the front and back directions of the paper. If the paper does not need to be adjusted in the front and back directions, the paper directly flows backward.

[0031] Further, in order to enable the clamping component 2 to quickly and efficiently move the supporting plate 25 to the bottom of the paper when the rotary paper loading structure adjusts the paper, a downward inclined hypotenuse is arranged in the relative direction of the supporting plates 25 on both sides, that is, in the direction where the supporting plate 25 is close to the paper. This is more conducive to moving the supporting plate 25 to the bottom of the paper and also avoids damaging the paper by the supporting plate 25.

[0032] The paper feeding structure of the present application can automatically adjust the front and back directions of the paper, solve the problem of inconsistent front and back directions of the paper existing in the actual production process, reduce the manual paper inspection and manual adjustment, greatly improve the production efficiency, reduce the labor intensity, make the production or paper feeding process more coherent, and improve the work efficiency and the stability of continuous work.

[0033] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present utility model.

Claims

1. A rotary paper feeding structure, characterized in that: The invention comprises a support frame (1), a clamping component (2), a driving component (3) and a rotating component (4) arranged on the support frame (1), wherein the driving component (3) can drive the clamping component (2) to move horizontally on the support frame (1), and the clamping component (2) can clamp paper in cooperation with the driving component (3), and the rotating component (4) can drive the support frame (1) and the clamping component (2) to rotate in the horizontal direction, thereby adjusting the front-rear direction of the paper clamped by the clamping component (2); The support frame (1) comprises a support beam (11), the upper end of the support beam (11) is fixedly connected to a connecting plate (12), the lower end of the support beam (11) is fixedly connected to a horizontal guide beam (13), the connecting plate (12) is used to be fixedly connected to a rotating component (4), and clamping components (2) are slidably arranged on the horizontal guide beams (13) on the left and right sides respectively, and the clamping components (2) can move horizontally along the horizontal guide beam (13) under the action of the driving component (3); The rotating component (4) is arranged above the connecting plate (12), and the rotating component (4) comprises a fixed plate (41), a rotating driving cylinder (42) is fixedly installed on one side of the fixed plate (41), the end of the piston rod of the rotating driving cylinder (42) is fixedly connected to a rack (44), and a fixed bracket (43) is fixedly installed at a corresponding position of the rack (44) on the fixed plate (41), and a rotating shaft (47) is arranged between the connecting plate (12) and the fixed plate (41), the lower end of the rotating shaft (47) is fixedly connected to the connecting plate (12), and the upper end of the rotating shaft (47) can rotate relative to the fixed plate (41), and the upper end of the rotating shaft (47) passes through the fixed plate (41). The upper end of the rotating shaft (47) is fixedly connected with a shaft head (46), and the outer side key of the shaft head (46) is connected with a spur gear (45), and the spur gear (45) is meshed with a rack (44). A bearing is installed at the lower part of the spur gear (45) and the outer side of the rotating shaft (47), and the bearing is also located above the fixed plate (41). The rack (44) realizes linear motion under the action of the rotary drive cylinder (42), thereby driving the spur gear (45) meshed with it to rotate horizontally. The spur gear (45) drives the shaft head (46) and the rotating shaft (47) to rotate, and the rotating shaft (47) further drives the connecting plate (12) and the clamping component (2) installed on the supporting frame (1) to rotate horizontally.

2. A rotary paper feeding structure according to claim 1, characterized in that: The driving component (3) comprises a servo motor (31) fixedly mounted on the support frame (1), a sprocket being arranged at the output end of the servo motor (31), and a connecting sleeve (33) arranged between the horizontal guide beams (13), a sprocket being also fixedly arranged on the connecting sleeve (33), the servo motor (31) and the connecting sleeve (33) being transmission-connected via the sprocket and a chain (32) connecting the two sprockets, the servo motor (31) can drive the connecting sleeve (33) to rotate via the sprocket and the chain (32), and the two ends of the connecting sleeve (33) are respectively fixedly mounted. A screw rod (34) is fixedly connected, and the screw rods (34) on both sides are respectively transmission-connected to an adjustment bracket (21) of the clamping component (2), and first sliders (22) are respectively provided at both ends of the adjustment bracket (21), and the adjustment bracket (21) is slidably connected to the horizontal guide beams (13) at both ends through the first sliders (22), and in addition, one side of the screw rods (34) on both sides is a left-hand screw rod (34) and the other side is a right-hand screw rod (34), and at the same time, the adjustment bracket (21) is threadedly connected to the screw rod (34) through a nut (29) fixedly provided on the adjustment bracket (21).

3. A rotary paper feeding structure according to claim 2, characterized in that: A second slider (23) is fixedly arranged on the outer side of the adjustment bracket (21) of the clamping component (2), and a lifting slider (24) is slidably connected to the second slider (23). The lifting slider (24) can move up and down along the second slider (23). A support plate (25) is fixedly connected to the bottom of the lifting slider (24). The support plate (25) is horizontally arranged. The lifting slider (24) is fixedly connected to the side of the support plate (25). In addition, a fixing member is fixedly installed on the adjustment bracket (21) on the same side of the lifting slider (24). A first lifting cylinder (26) is provided, the end of the piston rod of the first lifting cylinder (26) is fixedly connected to the side plate of the support plate (25), and the up and down movement of the piston rod of the first lifting cylinder (26) can drive the lifting slide bar (24) and the support plate (25) to move up and down synchronously. In addition, a second lifting cylinder (27) is fixedly installed on the inner side of the adjustment bracket (21), and the end of the piston rod of the second lifting cylinder (27) is fixedly connected to a pressure plate (28), and the pressure plate (28) is located above the support plate (25).

4. The rotary paper feeding structure according to claim 3, characterized in that: A paper pushing component (5) is also provided, the paper pushing component (5) comprising a fixed slider fixedly mounted on the front side of the support frame (1), the fixed slider being slidably connected to a lifting guide rod (51), the lifting guide rod (51) being able to slide up and down along the fixed slider, a paper pushing board (52) being fixedly connected to the lower end of the lifting guide rod (51), and a third lifting cylinder (53) being fixedly mounted on the front side of the support frame (1), the end of the piston rod of the third lifting cylinder (53) being also fixedly connected to the paper pushing board (52).

5. The rotary paper feeding structure according to claim 4, characterized in that: The ends on the same side of the horizontal guide beam (13) are fixedly connected via a reinforcing plate, and the ends of the screw rods (34) on both sides of the connecting sleeve (33) are rotatably connected to the reinforcing plate via bearings and axle seats.

6. The rotary paper feeding structure according to claim 5, characterized in that: A protective tube (49) is also provided on the outer side of the rotating shaft (47). The upper end of the protective tube (49) is fixedly connected to the fixed plate (41). A gap is left between the lower end of the protective tube (49) and the upper end surface of the connecting plate (12). A shaft sleeve (48) is installed between the rotating shaft (47) and the protective tube (49).

7. The rotary paper feeding structure according to claim 6, characterized in that: The support plate (25) is provided with a downwardly inclined bevel in a direction close to one side of the paper.

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