A paper feeding machine turnover structure

Abstract

The utility model discloses a paper feeding machine turnover structure belongs to paper feeding machine technical field, including paper feeding device, paper feeding device, paper feeding device is used for placing conveying paper stack to paper feeding device, its characterized in that: the middle part of paper feeding device is equipped with turnover device, when paper feeding device transmission paperboard, turnover device can lift paperboard and overturn, overturn paperboard. Through the integration of turnover device in the middle part of paper feeding device, can real -time overturn operation in the continuous transmission process of paperboard, avoided the paper feeding interruption problem of waiting automatic sorting device clamping and overturning in prior art, realized efficient continuous production process, and turnover device can accurate control paperboard's overturn action, effectively prevent paperboard and appear reverse phenomenon in the overturning process, ensure the positioning accuracy and consistency of paperboard in the follow -up processing, reduced the processing deviation risk of paperboard reverse.

Description

Technical Field

[0001] This utility model relates to the field of paper feeding machine technology, and specifically to a paper feeding machine flipping structure. Background Technology

[0002] A cardboard feeder, also known as a paper feeder, is a feeding device used in conjunction with a variety of cardboard box equipment, such as a watermarking machine, a gluing and stapling machine, and a crimping machine. The paper feeder works by manually pushing stacks of paper onto the feeding platform using a forklift. The transmission system of the equipment (hydraulic pump station and hydraulic cylinder) lifts and tilts the material to the designated flipping station, where the cardboard is easily flipped into the storage port by the operator. As the material on the feeding platform gradually decreases, the feeding platform will automatically lift the material to the designated height based on photoelectric feedback, allowing the operator to sort the material in one position.

[0003] Chinese utility model patent with announcement number "CN222181036U" discloses an automatic sorting feeder, including: a paper feeder body; a paper feeding platform movably installed inside the paper feeder body; and an automatic sorting device, which includes a mounting frame, a drive assembly, a lifting assembly, a positioning guide rod, and an electric clamp. The paper feeding platform, through its own transmission system, lifts and tilts the paper stack to a designated paper-turning position, which is below the automatic sorting device. The lifting assembly is activated, causing the electric clamp to fall above the paper stack. The electric clamp then opens, clamping a portion of the cardboard. Subsequently, the lifting assembly retracts and activates a motor to rotate a threaded rod. This causes a moving block, limited by a limiting housing, to move the lifting assembly to the left above the conveyor belt. The lifting assembly then lowers the electric clamp, releasing it and allowing the cardboard to fall onto the conveyor belt for transport.

[0004] However, according to paragraphs

[0022] to

[0030] of the instruction manual for the automatic sorting feeder, the paper stack needs to stay on the paper feeding table, waiting for the electric clamp to hold part of the cardboard and drive that part of the cardboard to flip over before being re-stacked on the paper feeding table. This makes it impossible to achieve continuous paper feeding of the cardboard, which cannot meet the rapid production needs of equipment such as cardboard die-cutting. Furthermore, the electric clamp cannot stably separate the front and back sides of the paper stack, which can easily cause some cardboard to be reversed, resulting in the cardboard shifting during subsequent processing.

[0005] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0006] The purpose of this invention is to provide a paper feeder flipping structure that enables continuous paper feeding and flipping of paperboard, avoiding the reversed flipping of the feeder, so as to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a paper feeding machine flipping structure, including a paper feeding device and a paper delivery device. The paper feeding device is used to place and transport paper stacks to the paper delivery device. The paper delivery device is characterized in that: a flipping device is provided in the middle of the paper delivery device. When the paper delivery device transports paperboard, the flipping device can lift and flip the paperboard.

[0008] By adopting the above technical solution, the flipping device is integrated into the middle of the paper feeding device, which enables real-time flipping operation during continuous paperboard transmission. This avoids the paper feeding interruption problem caused by waiting for the automatic sorting device to clamp and flip the paperboard, as is the case in the prior art. This achieves an efficient continuous production process. At the same time, the flipping device can precisely control the flipping action of the paperboard, effectively preventing the paperboard from being reversed during the flipping process. This ensures the positioning accuracy and consistency of the paperboard in subsequent processing and reduces the risk of processing deviation caused by the reversed paperboard.

[0009] The aforementioned paper feeder flipping structure can be further configured as follows: the flipping device includes a flipping frame, a flipping roller shaft, and several sets of flipping rods disposed on the flipping roller shaft. Each set of flipping rods is circumferentially spaced on the flipping roller shaft. The flipping roller shaft is rotatably engaged with the flipping frame. The flipping frame is equipped with a flipping motor, which can drive the flipping roller shaft to rotate circumferentially, causing the flipping rods to rotate around the central axis of the flipping roller shaft, thereby flipping the paperboard.

[0010] By adopting the above technical solution, the circumferentially spaced flipping rods can apply force evenly to the cardboard during rotation, reducing localized pressure on the cardboard and preventing deformation or damage during flipping. Simultaneously, the precise control of the flipping motor allows for adjustable flipping action, adapting to cardboard of different thicknesses and materials, thus improving the equipment's versatility and durability. As a preferred option, the flipping rods can be designed as detachable or angle-adjustable structures, fixed to the flipping roller shaft with bolts. Operators can quickly adjust the distribution of the flipping rods according to the cardboard size, ensuring the flipping action covers the entire width of the cardboard, thereby enhancing the uniformity and efficiency of flipping. The flipping motor is directly connected to the flipping roller shaft via a coupling, driving the roller shaft to rotate at a uniform speed, allowing the flipping rods to complete the lifting and flipping actions along a predetermined trajectory, avoiding cardboard slippage or misalignment caused by sudden speed changes.

[0011] The aforementioned paper feeder flipping structure can be further configured as follows: the paper feeding device includes a paper feeding bracket and several sets of paper feeding conveyor belts spaced apart on the paper feeding bracket. The paper feeding bracket is equipped with a drive roller shaft. The paper feeding conveyor belts are linked with the drive roller shafts. A set of flipping rods passes between two sets of paper feeding conveyor belts. The rotation of the drive roller shaft drives the paper feeding conveyor belts to rotate, which in turn moves the paperboard to the flipping device. The operation of the flipping motor drives the flipping rods to rotate around the central axis of the flipping roller shaft. The flipping rods drive the paperboard to rotate around the flipping roller shaft, causing the inverted paperboard to flip.

[0012] By adopting the above technical solution, the coordinated operation of the paper feeding device and the flipping device realizes the continuous conveying and precise flipping of the paperboard. The interval distribution of the paper feeding conveyor belt provides sufficient room for the flipping rod to ensure that the flipping action will not interfere with the normal transmission of the paperboard. The drive roller drives the paper feeding conveyor belt to run smoothly, reducing the slippage or jamming of the paperboard during the conveying process. At the same time, the flipping rod is inserted between the conveyor belts and can perform the flipping operation in time when the paperboard passes by, effectively solving the problem of paperboard reversal and improving the overall processing efficiency.

[0013] The aforementioned paper feeder flipping structure can be further configured as follows: the paper feed bracket is also provided with a speed adjustment device for adjusting the speed of the drive roller. The speed adjustment device includes an adjustment chain, several sets of deflection sprockets rotatably mounted on the paper feed bracket, an adjustment slider for adjusting the advance or delay, and an adjustment component. The paper feed bracket has an adjustment groove, and the adjustment slider is slidably mounted in the adjustment groove. The adjustment slider is linked to a locking component, which is used to lock the adjustment slider in the adjustment groove. A first adjustment sprocket and a second adjustment sprocket are rotatably mounted on the adjustment slider. The adjustment chain meshes with the first adjustment sprocket and the second adjustment sprocket. The adjustment slider is linked to the adjustment component. The operation of the adjustment component drives the adjustment slider to reciprocate within the adjustment groove, which in turn drives the first adjustment sprocket and the second adjustment sprocket to move, causing the drive roller to rotate earlier or later.

[0014] By adopting the above technical solutions: the speed adjustment device allows the paper feeding speed to be flexibly adjusted according to actual production needs, avoiding the mismatch problem of paperboard conveying caused by fixed speed; the sliding of the adjusting slider in the adjusting groove and the locking part ensure the stability after adjustment and prevent loosening during equipment operation; the meshing transmission of the adjusting chain and sprocket ensures the reliability of power transmission and makes the rotation timing of the drive roller adjustable, thereby optimizing the dwell time of the paperboard at the flipping device and improving the flipping success rate and production efficiency.

[0015] The aforementioned paper feeder flipping structure can be further configured as follows: the adjustment assembly includes an adjustment handwheel, an adjustment screw, and an adjustment seat. The end of the adjustment handwheel is provided with a first arc-tooth bevel gear, and the adjustment screw is provided with a second arc-tooth bevel gear. The first arc-tooth bevel gear meshes with the second arc-tooth bevel gear. The paper feeding bracket is provided with several sets of adjustment support plates. The adjustment screw and the adjustment support plates are rotatably engaged. One end of the adjustment seat is threadedly connected to the adjustment screw, and the other end is fixedly connected to the adjustment slider. Rotating the adjustment handwheel drives the adjustment screw to rotate, causing the adjustment seat to drive the adjustment slider to reciprocate along the axis of the adjustment screw.

[0016] By adopting the above technical solution: the adjustment component achieves precise linear adjustment through gear and lead screw structure. The meshing of the spiral bevel gear ensures the smoothness and efficiency of power transmission, reduces vibration and noise during the adjustment process, and the threaded connection between the adjustment lead screw and the adjustment seat provides reliable displacement control, enabling the adjustment slider to be accurately positioned, thereby quickly adjusting the paper feeding speed to adapt to different production rhythms and improving the flexibility and ease of operation of the equipment.

[0017] The aforementioned paper feeder flipping structure can be further configured such that: the paper feeding bracket is also provided with a tension roller shaft, and several sets of tension rollers are distributed at intervals on the tension roller shaft. One end of the tension roller is linked to the tension roller shaft, and the other end is rotatably provided with a tension roller. The outer circumference of the tension roller abuts against the paper feeding conveyor belt. The rotation of the tension roller shaft drives the tension roller to rotate around the central axis of the tension roller shaft, causing the tension roller to tension the paper feeding conveyor belt.

[0018] By adopting the above technical solution, the tension roller effectively maintains the appropriate tension of the paper feeding conveyor belt, preventing the conveyor belt from loosening or slipping during operation, ensuring the stability and continuity of paperboard conveying. The contact between the tension roller and the conveyor belt reduces friction loss and extends the service life of the equipment. At the same time, the rotation of the tension roller can automatically adjust the tension according to the wear of the conveyor belt, reducing the frequency of manual maintenance and improving the reliability and production efficiency of the equipment.

[0019] The aforementioned paper feeding machine flipping structure can be further configured as follows: the paper feeding device includes a paper feeding frame and a paper feeding flywheel. A paper feeding sliding frame is provided above the paper feeding frame. The paper feeding flywheel and the paper feeding sliding frame are slidably engaged. The paper stack is placed on the paper feeding frame. The paper feeding frame can drive the paper stack to move up and down. The paper feeding flywheel can pick up the top cardboard of the paper stack and transport the cardboard to the paper feeding device.

[0020] By adopting the above technical solutions, the paper feeding device realizes automatic feeding of paper stacks and continuous supply of cardboard. The paper feeding flywheel grabs the cardboard by adsorption, avoiding the damage to the cardboard that may be caused by traditional mechanical clamping, ensuring that the paper feeding flywheel can be accurately positioned and adapt to paper stacks of different heights. The up and down movement function of the paper feeding rack is realized by a hydraulic or electric system, which can automatically adjust the height according to the reduction of paper stacks, so that the operator can always sort in a fixed position, reducing labor intensity and improving feeding efficiency and safety.

[0021] The beneficial effects of this utility model are as follows: By integrating the flipping device into the middle of the paper feeding device, this utility model can perform flipping operations in real time during the continuous transmission of the paperboard, avoiding the paper feeding interruption problem caused by waiting for the automatic sorting device to clamp and flip in the prior art, realizing an efficient continuous production process. At the same time, the flipping device can precisely control the flipping action of the paperboard, effectively preventing the paperboard from being reversed during the flipping process, ensuring the positioning accuracy and consistency of the paperboard in subsequent processing, reducing the risk of processing deviation caused by the reversed paperboard. The flipping action is completed around the central axis of the roller shaft, and then the paperboard continues to be conveyed. The whole process is smooth and requires no manual intervention, thereby improving the automation level and production efficiency of the equipment.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the paper feeder flipping structure of this utility model; Figure 2 This is a schematic diagram of the paper feeding device of this utility model; Figure 3 This is a schematic diagram of the conveying device of this utility model; Figure 4 This is a schematic diagram of the tension roller shaft of this utility model; Figure 5 This is a schematic diagram of the structure of the flipping device of this utility model; Figure 6 This is a schematic diagram of the speed adjustment device of this utility model; Labeling notes: Paper feeding device 1, Paper feeder 11, Paper feed flywheel 12, Paper feed sliding frame 13, Paper feeding device 2, Paper feed bracket 21, Adjusting slide 211, Paper feed conveyor belt 22, Drive roller shaft 23, Tensioning roller shaft 24, Tensioning roller 241, Tensioning roller 242, Tilting device 3, Tilting frame 31, Tilting roller shaft 32, Tilting rod 33, Tilting motor 34, Speed ​​adjustment device 4, Adjusting chain 41, Deflection sprocket 42, Adjusting slider 43, First adjusting sprocket 431, Second adjusting sprocket 432, Adjusting assembly 44, Adjusting handwheel 441, Adjusting screw 442, Adjusting seat 443, First arc tooth bevel gear 444, Second arc tooth bevel gear 424, Adjusting support plate 446. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] A paper feeder flipping structure, such as Figures 1 to 6 As shown, the device includes a paper loading device 1 and a paper feeding device 2. The paper loading device 1 is used to place and transport paper stacks onto the paper feeding device 2. The key feature is that the paper feeding device 2 is equipped with a flipping device 3 in the middle. When the paper feeding device 2 is transporting paperboard, the flipping device 3 can lift and flip the paperboard. By integrating the flipping device 3 into the middle of the paper feeding device 2, the flipping operation can be performed in real time during the continuous transport of paperboard, avoiding the paper feeding interruption problem caused by waiting for the automatic sorting device to clamp and flip in the prior art. This achieves an efficient continuous production process. At the same time, the flipping device 3 can precisely control the flipping action of the paperboard, effectively preventing the paperboard from being reversed during the flipping process, ensuring the positioning accuracy and consistency of the paperboard in subsequent processing, and reducing the risk of processing deviation caused by the reversed paperboard.

[0026] like Figure 2 As shown, the paper feeding device 1 includes a paper feeder 11 and a paper feeding flywheel 12. A paper feeding sliding frame 13 is provided above the paper feeder 11. The paper feeding flywheel 12 and the paper feeding sliding frame 13 are slidably engaged. Paper stacks are placed on the paper feeder 11, which can drive the paper stacks to move up and down. The paper feeding flywheel 12 can pick up the top cardboard of the paper stack and transport the cardboard to the paper feeding device 2. The paper feeding device 1 realizes automatic feeding of paper stacks and continuous supply of cardboard. The paper feeding flywheel 12 picks up the cardboard by suction, avoiding damage to the cardboard that may be caused by traditional mechanical clamping, ensuring that the paper feeding flywheel 12 can be accurately positioned and adapt to paper stacks of different heights. The up and down movement function of the paper feeder 11 is realized by a hydraulic or electric system, which can automatically adjust the height according to the reduction of the paper stack, so that the operator can always sort in a fixed position, reducing labor intensity and improving feeding efficiency and safety.

[0027] like Figure 3As shown, the paper feeding device 2 includes a paper feeding bracket 21 and several sets of paper feeding conveyor belts 22 spaced apart on the paper feeding bracket 21. A drive roller shaft 23 is mounted on the paper feeding bracket 21. The paper feeding conveyor belts 22 and the drive roller shaft 23 are linked. The rotation of the drive roller shaft 23 drives the paper feeding conveyor belts 22 to rotate, moving the cardboard to the flipping device 3. The flipping motor 34 rotates, driving the flipping rod 33 to rotate around the central axis of the flipping roller shaft 32. The flipping rod 33 drives the cardboard to rotate around the flipping roller shaft 32, causing the inverted cardboard to flip. The coordinated operation of the paper feeding device 2 and the flipping device 3 achieves continuous conveying and precise flipping of the cardboard. The spaced distribution of the paper feeding conveyor belts 22 provides sufficient space for the flipping rod 33 to move, ensuring that the flipping action does not interfere with the normal transmission of the cardboard. The drive roller shaft 23 drives the paper feeding conveyor belts 22 to run smoothly, reducing slippage or jamming of the cardboard during conveying. Simultaneously, the flipping rod 33, passing between the conveyor belts 22, can perform timely flipping operations as the cardboard passes by, effectively solving the problem of cardboard reversal and improving overall processing efficiency.

[0028] like Figure 3 , Figure 4 As shown, the paper feeding bracket 21 is also equipped with a tensioning roller shaft 24, with several sets of tensioning rollers 241 spaced apart. One end of each tensioning roller 241 is linked to the tensioning roller shaft 24, while the other end is rotatably equipped with a tensioning roller 242. The outer circumference of the tensioning roller 242 abuts against the paper feeding conveyor belt 22. The rotation of the tensioning roller shaft 24 drives the tensioning rollers 241 to rotate around the central axis of the tensioning roller shaft 24, causing the tensioning rollers to tension the paper feeding conveyor belt 22. The tensioning roller shaft 24 effectively maintains the appropriate tension of the paper feeding conveyor belt 22, preventing the conveyor belt 22 from loosening or slipping during operation, ensuring the stability and continuity of paperboard conveying. The contact between the tensioning roller 242 and the conveyor belt 22 reduces frictional loss and extends the service life of the equipment. At the same time, the rotation of the tensioning roller 241 can automatically adjust the tension according to the wear of the conveyor belt 22, reducing the frequency of manual maintenance and improving the reliability and production efficiency of the equipment.

[0029] like Figure 5 As shown, the flipping device 3 includes a flipping frame 31, a flipping roller 32, and several sets of flipping rods 33 mounted on the flipping roller 32. Each set of flipping rods 33 is circumferentially spaced on the flipping roller 32. The flipping roller 32 is rotatably engaged with the flipping frame 31. The flipping frame 31 is equipped with a flipping motor 34, which can drive the flipping roller 32 to rotate circumferentially, causing the flipping rods 33 to rotate around the central axis of the flipping roller 32, thus flipping the cardboard. One set of flipping rods 33 passes between two sets of paper feeding conveyor belts 22. The circumferentially spaced flipping rods 33 can apply force evenly to the cardboard during rotation, reducing local pressure on the cardboard and preventing deformation or damage to the cardboard during flipping. At the same time, the precise control of the flipping motor 34 makes the flipping action adjustable, adapting to cardboard of different thicknesses and materials, thus improving the versatility and durability of the equipment.

[0030] like Figure 6 As shown, the paper feed bracket 21 is also equipped with a speed adjustment device 4 for adjusting the speed of the drive roller 23. The speed adjustment device 4 includes an adjustment chain 41, several sets of deflection sprockets 42 rotatably mounted on the paper feed bracket 21, an adjustment slider 43 for adjusting the advance or delay, and an adjustment assembly 44. The paper feed bracket 21 has an adjustment groove 211. The adjustment slider 43 is slidably mounted in the adjustment groove 211. The adjustment slider 43 is linked to a locking member, which is used to lock the adjustment slider 43 in the adjustment groove 211. A first adjustment sprocket 431 and a second adjustment sprocket 432 are rotatably mounted on the adjustment slider 43. The adjustment chain 41 meshes with the first adjustment sprocket 431 and the second adjustment sprocket 432. The adjustment slider 43 is linked to the adjustment assembly 44. The operation of the adjustment assembly 44 drives the adjustment slider 43 to reciprocate within the adjustment groove 211, which in turn drives the first adjustment sprocket 431 and the second adjustment sprocket 432 to move, causing the drive roller 23 to rotate earlier or later. The speed adjustment device 4 allows the paper feeding speed to be flexibly adjusted according to actual production needs, avoiding the mismatch problem of paperboard feeding caused by fixed speed. The sliding of the adjusting slider 43 in the adjusting groove 211 and the locking part ensure the stability after adjustment and prevent loosening during equipment operation. The meshing transmission between the adjusting chain 41 and the sprocket ensures the reliability of power transmission and makes the rotation timing of the drive roller 23 adjustable, thereby optimizing the dwell time of the paperboard at the flipping device 3 and improving the flipping success rate and production efficiency.

[0031] The adjustment assembly 44 includes an adjustment handwheel 441, an adjustment screw 442, and an adjustment seat 443. The end of the adjustment handwheel 441 is provided with a first arc-tooth bevel gear 444, and the adjustment screw 442 is provided with a second arc-tooth bevel gear 424. The first arc-tooth bevel gear 444 and the second arc-tooth bevel gear 424 mesh with each other. The paper feeding bracket 21 is provided with several sets of adjustment support plates 446. The adjustment screw 442 is rotatably engaged with the adjustment support plates 446. One end of the adjustment seat 443 is threadedly connected to the adjustment screw 442, and the other end is fixedly connected to the adjustment slider 43. The rotation of the adjustment handwheel 441 drives the adjustment screw 442 to rotate, causing the adjustment seat 443 to drive the adjustment slider 43 to reciprocate along the axial direction of the adjustment screw 442. The adjustment assembly 44 achieves precise linear adjustment through a gear and lead screw structure. The meshing of the spiral bevel gears ensures smooth and efficient power transmission, reducing vibration and noise during the adjustment process. The threaded connection between the adjustment lead screw 442 and the adjustment seat 443 provides reliable displacement control, enabling the adjustment slider 43 to be precisely positioned, thereby quickly adjusting the paper feeding speed to adapt to different production rhythms and improving the flexibility and ease of operation of the equipment.

[0032] The working principle of this embodiment is as follows: Paper stacks are placed on the paper rack 11 of the paper feeding device 1. The height of the paper stack is adjusted by the lifting mechanism. The paper feeding flywheel 12 slides on the paper feeding sliding frame 13 and picks up the topmost cardboard, conveying it to the paper feeding conveyor belt 22 of the paper feeding device 2. The paper feeding conveyor belt 22 is driven by the drive roller shaft 23, which transports the cardboard to the flipping device 3. At this time, the flipping motor 34 starts, driving the flipping roller shaft 32 and the flipping rod 33 to rotate, lifting and flipping the cardboard, realizing the forward and reverse adjustment of the cardboard. The speed adjustment device 4 is operated by the adjustment handwheel 441, which drives the adjustment slider 43 to move through the adjustment screw 442 and the adjustment seat 443, changing the chain transmission relationship, thereby adjusting the rotation timing of the drive roller shaft 23 to ensure that the cardboard and the flipping action are synchronized. The tensioning roller shaft 24 continuously tensions the paper feeding conveyor belt 22 through the tensioning roller 242 to prevent slippage or deviation, ensuring the stability and reliability of the entire conveying and flipping process.

[0033] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A paper feeder flipping structure, comprising a paper feeding device and a paper delivery device, wherein the paper feeding device is used to place and transport stacks of paper onto the paper delivery device, characterized in that: The paper feeding device is equipped with a flipping device in the middle. When the paper feeding device is conveying paperboard, the flipping device can lift and flip the paperboard.

2. The paper feeder flipping structure according to claim 1, characterized in that: The flipping device includes a flipping frame, a flipping roller shaft, and several sets of flipping rods mounted on the flipping roller shaft. Each set of flipping rods is circumferentially spaced on the flipping roller shaft. The flipping roller shaft is rotatably engaged with the flipping frame. The flipping frame is equipped with a flipping motor, which can drive the flipping roller shaft to rotate circumferentially, causing the flipping rods to rotate around the central axis of the flipping roller shaft, thereby flipping the cardboard.

3. The paper feeder flipping structure according to claim 2, characterized in that: The paper feeding device includes a paper feeding bracket and several sets of paper feeding conveyor belts spaced apart on the paper feeding bracket. The paper feeding bracket is equipped with a drive roller shaft. The paper feeding conveyor belts are linked to the drive roller shafts. A set of flipping rods passes between two sets of paper feeding conveyor belts. The rotation of the drive roller shaft drives the paper feeding conveyor belts to rotate, moving the cardboard to the flipping device. The operation of the flipping motor drives the flipping rods to rotate around the central axis of the flipping roller shaft. The flipping rods drive the cardboard to rotate around the flipping roller shaft, causing the inverted cardboard to flip.

4. The paper feeder flipping structure according to claim 3, characterized in that: The paper feeding bracket is also equipped with a speed adjustment device for adjusting the speed of the drive roller. The speed adjustment device includes an adjustment chain, several sets of deflection sprockets rotatably mounted on the paper feeding bracket, an adjustment slider for adjusting the advance or delay, and an adjustment assembly. The paper feeding bracket has an adjustment groove, and the adjustment slider is slidably mounted in the adjustment groove. The adjustment slider is linked to a locking member, which is used to lock the adjustment slider in the adjustment groove. A first adjustment sprocket and a second adjustment sprocket are rotatably mounted on the adjustment slider. The adjustment chain meshes with the first and second adjustment sprockets. The adjustment slider is linked to the adjustment assembly. The operation of the adjustment assembly drives the adjustment slider to reciprocate within the adjustment groove, which in turn drives the first and second adjustment sprockets to move, causing the drive roller to rotate earlier or later.

5. The paper feeder flipping structure according to claim 4, characterized in that: The adjustment assembly includes an adjustment handwheel, an adjustment screw, and an adjustment seat. The end of the adjustment handwheel is provided with a first arc-tooth bevel gear, and the adjustment screw is provided with a second arc-tooth bevel gear. The first arc-tooth bevel gear meshes with the second arc-tooth bevel gear. The paper feeding bracket is provided with several sets of adjustment support plates. The adjustment screw is rotatably engaged with the adjustment support plates. One end of the adjustment seat is threadedly connected to the adjustment screw, and the other end is fixedly connected to the adjustment slider. The rotation of the adjustment handwheel drives the adjustment screw to rotate, causing the adjustment seat to drive the adjustment slider to reciprocate along the axis of the adjustment screw.

6. The paper feeder flipping structure according to claim 5, characterized in that: The paper feeding bracket is also equipped with a tensioning roller shaft, and several sets of tensioning rollers are distributed at intervals on the tensioning roller shaft. One end of the tensioning roller is linked to the tensioning roller shaft, and the other end is rotatably equipped with a tensioning roller. The outer circumferential surface of the tensioning roller abuts against the paper feeding conveyor belt. The rotation of the tensioning roller shaft drives the tensioning roller to rotate around the central axis of the tensioning roller shaft, causing the tensioning roller to tension the paper feeding conveyor belt.

7. A paper feeder flipping structure according to any one of claims 1 to 6, characterized in that: The paper feeding device includes a paper feeding rack and a paper feeding flywheel. A paper feeding sliding frame is provided above the paper feeding rack. The paper feeding flywheel is slidably engaged with the paper feeding sliding frame. The paper stack is placed on the paper feeding rack. The paper feeding rack can drive the paper stack to move up and down. The paper feeding flywheel can pick up the top cardboard of the paper stack and transport the cardboard to the paper feeding device.

Images