Front edge paper feeding platform with double eccentric bearing shafts for lifting

Abstract

The invention discloses a double-eccentric bearing shaft lifting front edge paper feeding platform. The double-eccentric bearing shaft lifting front edge paper feeding platform comprises a paper feeding wheel driving mechanism, an eccentric bearing driving mechanism, a wheel shaft, a paper feeding wheel and a lifting mechanism. The paper feeding wheel driving mechanism drives the paper feeding wheel to rotate, and the eccentric bearing driving mechanism controls an eccentric bearing shaft of the lifting mechanism to rotate, so that the paper feeding base plate can be higher than or lower than the top of the paper feeding wheel, and paper feeding action is achieved. The eccentric bearing is fixed on the eccentric bearing shaft through a locking ring and a key, and the supporting shaft is installed on the linear bearing to guarantee stable lifting. The main box wraps internal parts and is provided with an air suction box, and air suction on-off is controlled through an air control switch and an air control plate. The paper feeding platform is simplified in structure, more convenient to install and maintain and lower in cost, effectively improves paper feeding precision and stability, overcomes the defects of a traditional paper feeding platform, and is suitable for paper feeding operation in the industries of corrugated paper printing and the like.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a leading edge paper feeding platform with a double eccentric bearing shaft lift. Background Art

[0002] In today's printing industry, digital printing technology has made great progress, its maturity is increasing, and it has occupied an important position in the corrugated paper printing industry. With the development of the market, customers have increasingly stringent requirements for the accuracy of digital printed products. They expect the printing effect to be more delicate and accurate to meet the diverse product needs.

[0003] As the key starting component of the corrugated paper printing machine, the performance of the leading edge paper feeding platform has a decisive influence on the accuracy of subsequent printing, slotting, die-cutting and other processes. It is like the "pioneer" of the printing production line. The accuracy and stability of paper feeding are directly related to the smoothness of the entire production process and the quality of the final product.

[0004] At present, there are two main types of front edge paper feeding platforms commonly seen on the market. One type of paper feeding platform has a paper feeding wheel that rotates continuously or keeps in sync with the main printing machine in front, and the paper feeding operation is achieved by controlling the lifting and lowering of the paper feeding pad under the wheel; the other type is equipped with an independent servo motor or stepper motor for each row of wheels, and relies on the motor to control the rotation or stop of the wheel to complete the paper feeding action.

[0005] The existing lifting front edge paper feeding platform has many disadvantages. Its complex structure makes the installation process difficult, and professional technicians need to spend a lot of time and energy on installation and debugging, which not only increases the installation cost, but also increases the difficulty of later maintenance. In addition, due to the use of complex component design, the equipment cost remains high, which brings great economic pressure to enterprises.

[0006] In summary, in order to solve the above problems existing in the existing leading edge paper feeding platform, it is urgent to propose an innovative leading edge paper feeding platform with double eccentric bearing shaft lifting to meet the market demand for efficient, low-cost, easy to install and maintain paper feeding equipment. Summary of the invention

[0007] The present invention aims to provide a leading edge paper feeding platform with double eccentric bearing shaft lifting. Through innovative structural design and working principle, the lifting structure is optimized, the cost is reduced, the installation and maintenance process is simplified, and the paper feeding accuracy and stability are improved to meet the urgent needs of the corrugated paper printing industry for efficient and low-cost paper feeding equipment.

[0008] The present invention provides a leading edge paper feeding platform with double eccentric bearing shafts, comprising a paper feeding wheel driving mechanism, an eccentric bearing driving mechanism, a wheel shaft, a paper feeding wheel and a lifting mechanism, wherein the paper feeding wheel driving mechanism drives the wheel shaft and drives a plurality of paper feeding wheels installed on the wheel shaft to rotate; the eccentric bearing driving mechanism drives the eccentric bearing shaft of the lifting mechanism to rotate, the eccentric bearing shaft drives the eccentric bearing installed on the eccentric bearing shaft to rotate, and the eccentric bearing drives the support shaft to move up and down, so that the paper feeding pad installed on the support shaft is higher or lower than the top of the paper feeding wheel. The paper feeding wheel driving mechanism causes the paper feeding wheel to rotate continuously to provide power for paper feeding; the eccentric bearing driving mechanism drives the support shaft and the paper feeding pad to rise and fall by controlling the eccentric bearing shaft and the eccentric bearing, thereby realizing precise control of the paper feeding timing and the paper position, ensuring that the paper can contact or separate from the paper feeding wheel at the appropriate time, thereby completing an efficient and stable paper feeding operation.

[0009] Furthermore, the eccentric bearing is fixed on the eccentric bearing shaft by a locking ring and a key, and a plurality of eccentric bearings are provided. The locking ring and the key ensure that the eccentric bearing is firmly installed on the eccentric bearing shaft, preventing it from deflecting or loosening during rotation, and ensuring that the eccentric bearing works stably. The provision of multiple eccentric bearings can evenly disperse the force, enhance the carrying capacity of the lifting mechanism, make the lifting process of the paper feeding pad more stable, and ensure the paper feeding accuracy.

[0010] Furthermore, the support shaft is mounted on a linear bearing, and the linear bearing is fixed to the main box through a linear bearing bracket. The linear bearing provides precise guidance for the up and down movement of the support shaft, so that the support shaft can only move up and down stably in a linear direction to avoid shaking or offset, thereby ensuring the position accuracy of the paper feeding pad during the lifting process and ensuring the stability of paper feeding. The linear bearing bracket firmly fixes the linear bearing to the main box, providing a reliable support foundation for the entire lifting structure.

[0011] Furthermore, it also includes a main box, a suction box, and an end mounting plate. The paper feed wheel drive mechanism and the eccentric bearing drive mechanism are respectively installed on the end mounting plates on both sides of the main box. The main box wraps the wheel shaft, paper feed wheel, and lifting mechanism under the paper feed pad. The suction box is installed under the main box, and the suction box is also provided with an interface for an external suction fan. The main box protects and accommodates the internal components to prevent external factors from interfering with the normal operation of the paper feeding platform, and provides an installation basis for other components. The suction box is externally connected to a suction fan, which uses suction to absorb paper to prevent the paper from being offset or fluttering due to static electricity, airflow and other factors during the paper feeding process, thereby improving the accuracy and stability of paper feeding. The end mounting plate is used to fix the paper feed wheel drive mechanism and the eccentric bearing drive mechanism to ensure the installation position accuracy of these two key drive components so that they can operate stably and work together.

[0012] Furthermore, a number of partitions are provided in the main box to separate and form a number of cavities, a through hole is provided at the bottom of the cavity, and a wind control switch and a wind control plate are installed at the through hole. The wind control switch controls the wind control plate to control the through hole to realize the suction of the cavity. The partition divides the interior of the main box into multiple cavities, which is convenient for zoning control of the suction area. The combination of the wind control switch and the wind control plate can accurately control the suction of each cavity according to different paper materials, thicknesses and paper feeding requirements. For example, for thinner paper, the suction force can be appropriately reduced to avoid the paper being sucked too tightly and damaged; for thicker or easily floating paper, the suction effect is enhanced to ensure the stability of the paper feeding process, thereby improving the adaptability of the paper feeding platform to different papers.

[0013] Furthermore, the eccentric bearing driving mechanism includes a cylinder, a cylinder connecting rod, a connecting rod A, and a connecting rod B. There are two connecting rods A, which are respectively fixed on two eccentric bearing shafts. The connecting rod B connects the two connecting rods A. The cylinder connecting rod is fixed on the eccentric bearing shaft, and the piston end of the cylinder is connected to the cylinder connecting rod. The cylinder serves as a power source and generates power through the telescopic movement of the piston. The cylinder connecting rod transmits the power of the cylinder to the eccentric bearing shaft, so that the eccentric bearing shaft can rotate. The two connecting rods A are respectively fixed on the two eccentric bearing shafts, and the connecting rod B connects the two connecting rods A. This structural design can realize the synchronous rotation of the two eccentric bearing shafts, ensure the consistent lifting and lowering actions on both sides of the paper feeding pad, keep the paper feeding pad in a horizontal state, avoid paper tilting or poor paper feeding due to uneven lifting, and ensure the accuracy and stability of paper feeding.

[0014] Furthermore, the paper feed wheel driving mechanism includes a motor, a synchronous belt, and a synchronous wheel. The synchronous wheel is installed at the end of the wheel shaft. The motor drives the synchronous belt to drive the synchronous wheel, the wheel shaft and the paper feed wheel to rotate. The motor provides rotational power as a power source, and the synchronous belt and synchronous wheel efficiently transmit the power of the motor to the wheel shaft and the paper feed wheel to achieve stable rotation of the paper feed wheel. This transmission method can ensure that the speed of the paper feed wheel is uniform and consistent, avoid the situation where the speed fluctuation causes uneven paper feeding, ensure the continuity and stability of paper feeding, and provide reliable paper feeding guarantee for subsequent printing, processing and other processes.

[0015] Furthermore, a supporting foot is installed below the main body box. A top mounting plate is arranged around the top of the main body box, and the top mounting plate is located below the paper feeding pad.

[0016] Furthermore, three wheel shafts are provided, and the paper feed wheels are staggeredly installed on the wheel shafts; two eccentric bearing shafts are provided and located below the wheel shafts. The three wheel shafts and the staggered paper feed wheels increase the contact area with the paper, so that the paper is subjected to more uniform force during the paper feeding process, avoiding deformation and deviation of the paper due to excessive or insufficient local force, and improving the stability and accuracy of paper feeding. The two eccentric bearing shafts work together to more accurately control the lifting and lowering action of the paper feed pad, ensure the lifting and lowering accuracy and stability of the paper feed pad, and thus ensure the efficient and stable operation of the paper feeding platform.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Simplified structure and reduced cost: Abandoning the traditional complex connecting rod eccentric wheel lifting structure, the double eccentric bearing shaft is adopted in combination with the cylinder-driven lifting method, which greatly reduces the number of parts. The main box adopts the sheet metal integrated molding process to replace the aluminum profile, further reducing the material cost. Under the premise of ensuring the paper feeding function, the overall equipment cost is effectively reduced and the economic benefits of the enterprise are improved.

[0019] Improved convenience of installation and maintenance: The simple structural design makes the installation process easier, reducing the cumbersome assembly steps and high-precision alignment requirements. Ordinary technicians can quickly complete the installation, shortening the equipment installation cycle and improving production preparation efficiency. During maintenance, due to the small number of parts and clear layout, troubleshooting is easier, reducing maintenance difficulty and time cost, reducing equipment downtime, and ensuring production continuity.

[0020] Enhanced paper feeding accuracy and stability: The design of the double eccentric bearing shaft can achieve more precise lifting and lowering control of the paper feeding pad, ensuring that the timing of contact and separation between the paper feeding wheel and the paper is just right. Combined with the staggered paper feeding wheels, the paper is evenly stressed during the paper feeding process, effectively reducing paper deviation and jamming. The coordinated work of the suction box and the wind control mechanism can prevent the paper from fluttering due to static electricity or airflow interference by accurately controlling the suction, significantly improving the stability and accuracy of paper feeding, providing high-quality paper feeding guarantee for subsequent printing, slotting, die-cutting and other processes, and improving product quality qualification rate.

[0021] Power control advantage: The use of cylinders as the driving power of the eccentric bearing shaft greatly reduces the cost compared to the expensive servo motors used in the full-servo leading edge paper feeding platform. At the same time, the power output of the cylinder is stable and reliable, which can meet the needs of frequent lifting and lowering of the paper feeding platform. While ensuring the performance of the equipment, it optimizes the cost structure and improves the market competitiveness of the product.

[0022] Improved adaptability and versatility: The multi-cavity design and controllable wind control mechanism in the main box can flexibly adjust the suction intensity and area according to the material, thickness and size of different papers. Whether it is thin paper or thick cardboard, stable paper feeding can be achieved by reasonably controlling the suction, which enhances the adaptability of the paper feeding platform to various paper types, expands the application range of the equipment, and meets the needs of different printing production scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 An overall schematic diagram provided for an embodiment of the present invention;

[0025] Figure 2 Another overall schematic diagram provided for an embodiment of the present invention;

[0026] Figure 3 An explosion diagram provided for an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of a paper feeding wheel driving mechanism provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a lifting mechanism provided in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a paper feeding mechanism provided in an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of an eccentric bearing drive mechanism provided in an embodiment of the present invention;

[0031] Figure 8 An overall cross-sectional view provided for an embodiment of the present invention;

[0032] Fig. 9 A schematic diagram of the working example of the present invention;

[0033] Fig.10 A cross-sectional schematic diagram is provided for an embodiment of the present invention.

[0034] Among them, the reference numerals in the figure are:

[0035] 1. Eccentric bearing shaft; 2. Locking ring; 3. Eccentric bearing; 4. Linear bearing; 5. Linear bearing bracket; 6. Support shaft; 7. Support foot; 8. Paper feed pad; 9. Wheel shaft; 10. Paper feed wheel; 11. End mounting plate; 12. Wind control switch; 121. Wind control plate; 13. Suction box; 131. Interface; 14. Connecting rod A; 15. Connecting rod B; 16. Cylinder connecting rod; 17. Cylinder; 18. Main box; 19. Paper feed wheel drive mechanism; 191. Motor; 192. Synchronous belt; 193. Synchronous wheel; 20. Eccentric bearing drive mechanism; 21. Top mounting plate; 22. Lifting mechanism; 23. Partition.

[0036] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] See also Figure 1-Figure 10 As shown, this embodiment provides a leading edge paper feeding platform with double eccentric bearing shaft lifting, which specifically includes a paper feeding wheel driving mechanism 19, an eccentric bearing driving mechanism 20, a wheel shaft 9, a paper feeding wheel 10 and a lifting mechanism 22. The paper feeding wheel driving mechanism 19 drives the wheel shaft 9 and drives a plurality of paper feeding wheels 10 installed on the wheel shaft 9 to rotate. The eccentric bearing driving mechanism 20 drives the eccentric bearing shaft 1 of the lifting mechanism 22 to rotate, and the eccentric bearing shaft 1 drives the eccentric bearing 3 installed on the eccentric bearing shaft 1 to rotate, and the eccentric bearing 3 drives the support shaft 6 to move up and down, so that the paper feeding pad 8 installed on the support shaft 6 is higher or lower than the top of the paper feeding wheel 10.

[0040] like Figure 5As shown, the eccentric bearing 3 is fixed on the eccentric bearing shaft 1 by a locking ring 2 and a key, and several eccentric bearings 3 are provided. The locking ring 2 and the key ensure that the eccentric bearing 3 is firmly installed on the eccentric bearing shaft 1, preventing it from deflecting or loosening during rotation, and ensuring the stable operation of the eccentric bearing 3. The support shaft 6 is installed on the linear bearing 4, and the linear bearing 4 is fixed to the main box 18 by the linear bearing bracket 5. The linear bearing 4 provides precise guiding for the up and down movement of the support shaft 6, so that the support shaft 6 can only move up and down stably in a straight line direction to avoid shaking or offset, thereby ensuring the position accuracy of the paper feeding pad 8 during the lifting process and ensuring the stability of paper feeding. The linear bearing bracket 5 firmly fixes the linear bearing 4 on the main box 18, providing a reliable support foundation for the entire lifting structure.

[0041] like Figure 1 , 2 As shown in Figure 3, this embodiment also includes a main body box 18, a suction box 13, and an end mounting plate 11. The paper feed wheel drive mechanism 19 and the eccentric bearing drive mechanism 20 are respectively installed on the end mounting plates 11 on both sides of the main body box 18. The main body box 18 wraps the wheel shaft 9, the paper feed wheel 10, and the lifting mechanism 22 under the paper feed pad 8. The suction box 13 is installed under the main body box 18, and the suction box 13 is also provided with an interface 131 for an external suction fan. The main body box 18 plays a role in protecting and accommodating internal components to prevent external factors from interfering with the normal operation of the paper feeding platform, and at the same time provides an installation basis for other components. The suction box 13 is externally connected to a suction fan, which uses suction to absorb paper, avoids the paper from being offset or fluttering due to static electricity, airflow and other factors during the paper feeding process, and improves the accuracy and stability of paper feeding. The end mounting plate 11 is used to fix the paper feed wheel drive mechanism 19 and the eccentric bearing drive mechanism 20, to ensure the installation position accuracy of these two key drive components, so that they can operate stably and work together.

[0042] like Figure 6 , 10 As shown, a number of partitions 23 are arranged in the main box 18 to separate and form a number of cavities, and a through hole is opened at the bottom of the cavity, and a wind control switch 12 and a wind control plate 121 are installed at the through hole. The wind control switch 12 controls the wind control plate 121 to control the through hole to realize the suction of the cavity. The partition 23 divides the inside of the main box 18 into multiple cavities, which is convenient for zoning control of the suction area. The combination of the wind control switch 12 and the wind control plate 121 can accurately control the suction of each cavity according to different paper materials, thicknesses and paper feeding requirements. For example, for thinner paper, the suction force can be appropriately reduced to avoid the paper being sucked too tightly and damaged; for thicker or easily floating paper, the suction effect is enhanced to ensure the stability of the paper feeding process, thereby improving the adaptability of the paper feeding platform to different papers.

[0043] like Figure 7As shown, the eccentric bearing drive mechanism 20 includes a cylinder 17, a cylinder connecting rod 16, a connecting rod A14, and a connecting rod B15. There are two connecting rods A14, which are fixed on two eccentric bearing shafts 1 respectively. The connecting rod B15 connects the two connecting rods A14. The cylinder connecting rod 16 is fixed on the eccentric bearing shaft 1. The piston end of the cylinder 17 is connected to the cylinder connecting rod 16. The cylinder 17 serves as a power source and generates power through the telescopic movement of the piston. The cylinder connecting rod 16 transmits the power of the cylinder 17 to the eccentric bearing shaft 1, so that the eccentric bearing shaft 1 can rotate. The two connecting rods A are fixed on the two eccentric bearing shafts 1 respectively, and the connecting rod B connects the two connecting rods A. This structural design can realize the synchronous rotation of the two eccentric bearing shafts 1, ensure the consistent lifting and lowering actions of the two sides of the paper feeding pad 8, and keep the paper feeding pad 8 in a horizontal state. The lifting and lowering can avoid the tilting of the paper or the poor paper feeding due to uneven lifting, and ensure the accuracy and stability of the paper feeding. It should be noted that, in some embodiments, the cylinder 17 can be replaced by a power source such as a motor or a hydraulic cylinder.

[0044] like Figure 4 As shown, the paper feed wheel driving mechanism 19 includes a motor 191, a synchronous belt 192, and a synchronous wheel 193. The synchronous wheel 193 is installed at the end of the wheel shaft 9. The motor 191 drives the synchronous belt 192 to drive the synchronous wheel 193, the wheel shaft 9 and the paper feed wheel 10 to rotate. The motor 191 provides rotational power as a power source. The synchronous belt 192 and the synchronous wheel 193 efficiently transmit the power of the motor 191 to the wheel shaft 9 and the paper feed wheel 10 to achieve stable rotation of the paper feed wheel 10. This transmission method can ensure that the speed of the paper feed wheel 10 is uniform, avoid the situation where the speed fluctuation causes uneven paper feeding, ensure the continuity and stability of paper feeding, and provide reliable paper feeding guarantee for subsequent printing, processing and other processes. In this embodiment, the motor 191 adopts a servo motor.

[0045] like Figure 3 As shown, a support foot 7 is also installed below the main box 18 of this embodiment. A top mounting plate 21 is arranged around the top of the main box 18, and the top mounting plate 21 is located below the paper feeding pad 8. Three wheel shafts 9 are provided, and the paper feeding wheels 10 are staggeredly installed on the wheel shafts 9; two eccentric bearing shafts 1 are provided, which are located below the wheel shafts 9. The three wheel shafts 9 and the staggered paper feeding wheels 10 increase the contact area with the paper, so that the paper is more evenly stressed during the paper feeding process, avoiding deformation, offset and other problems of the paper due to excessive or insufficient local force, and improving the stability and accuracy of paper feeding. The two eccentric bearing shafts 1 work together to more accurately control the lifting and lowering action of the paper feeding pad 8, ensure the lifting and lowering accuracy and stability of the paper feeding pad 8, and thus ensure the efficient and stable operation of the paper feeding platform.

[0046] In order to have a more thorough and comprehensive understanding of the disclosure of the present invention, the principle thereof is further explained below in conjunction with the usage method.

[0047] In actual use, the following process is included:

[0048] Paper feeding process: When the equipment enters the normal operation state, the motor 191 in the paper feeding wheel driving mechanism 19 starts, and drives the synchronous wheel 193, the wheel shaft 9 and the paper feeding wheel 10 to start rotating at a constant speed through the synchronous belt 192. At the same time, the cylinder 17 in the eccentric bearing driving mechanism 20 performs telescopic movement according to the preset program, and the cylinder 17 drives the eccentric bearing shaft 1 to rotate through the cylinder connecting rod 16, and the eccentric bearing 3 on the eccentric bearing shaft 1 rotates accordingly, thereby driving the support shaft 6 and the paper feeding pad 8 to move up and down. When the paper feeding pad 8 drops below the top of the paper feeding wheel 10, as shown in FIG. Figure 8 As shown, the paper feeding wheel 10 is in direct contact with the bottom sheet of paper, and under the friction force of the paper feeding wheel 10, the paper starts to move forward.

[0049] Paper transmission and control: As the paper moves forward, when the front end of the paper enters the subsequent processing machine and obtains stable power, the cylinder 17 acts to make the paper feeding pad 8 rise above the top of the paper feeding wheel 10, such as Fig. 9 As shown, at this time, the paper continues to move forward relying on the power of the subsequent machine until it is delivered. After the first sheet of paper is delivered, the second sheet of paper falls onto the paper feeding pad 8, and the cylinder 17 repeats the above action again to achieve continuous paper feeding. During the paper feeding process, the air suction and air control mechanism continues to work, and by controlling the air suction intensity and area, it ensures that the paper always remains in a stable state during the entire paper feeding process without being disturbed by external factors.

[0050] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the present invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the claims above.

[0051] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are positional relationships with reference to the accompanying drawings.

[0052] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A leading edge paper feeding platform with double eccentric bearing shaft lifting, characterized in that: The invention comprises a paper feed wheel driving mechanism (19), an eccentric bearing driving mechanism (20), a wheel shaft (9), a paper feed wheel (10) and a lifting mechanism (22); the paper feed wheel driving mechanism (19) drives the wheel shaft (9) to rotate and drives a plurality of paper feed wheels (10) mounted on the wheel shaft (9) to rotate; the eccentric bearing driving mechanism (20) drives an eccentric bearing shaft (1) of the lifting mechanism (22) to rotate; the eccentric bearing shaft (1) drives an eccentric bearing (3) mounted on the eccentric bearing shaft (1) to rotate; the eccentric bearing (3) drives a support shaft (6) to move up and down, so that a paper feed pad (8) mounted on the support shaft (6) is higher or lower than the top of the paper feed wheel (10).

2. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The eccentric bearing (3) is fixed on the eccentric bearing shaft (1) through a locking ring (2) and a key, and a plurality of eccentric bearings (3) are provided.

3. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The support shaft (6) is mounted on a linear bearing (4), and the linear bearing (4) is fixed on a main body box (18) via a linear bearing bracket (5).

4. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The invention also comprises a main body box (18), a suction box (13), and an end mounting plate (11); the paper feed wheel driving mechanism (19) and the eccentric bearing driving mechanism (20) are respectively mounted on the end mounting plates (11) on both sides of the main body box (18); the main body box (18) wraps the wheel shaft (9), the paper feed wheel (10), and the lifting mechanism (22) below the paper feed pad (8); the suction box (13) is mounted below the main body box (18), and the suction box (13) is also provided with an interface (131) for connecting an external suction fan.

5. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 4, characterized in that: A plurality of partitions (23) are arranged in the main box (18) to separate and form a plurality of cavities, a through hole is provided at the bottom of the cavity, a wind control switch (12) and a wind control plate (121) are installed at the through hole, and the wind control switch (12) controls the wind control plate (121) to control the through hole to realize the air suction of the cavity on and off.

6. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The eccentric bearing drive mechanism (20) comprises a cylinder (17), a cylinder connecting rod (16), a connecting rod A (14), and a connecting rod B (15). There are two connecting rods A (14), which are respectively fixed on two eccentric bearing shafts (1). The connecting rod B (15) connects the two connecting rods A (14). The cylinder connecting rod (16) is fixed on the eccentric bearing shaft (1). The piston end of the cylinder (17) is connected to the cylinder connecting rod (16).

7. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The paper feeding wheel driving mechanism (19) comprises a motor (191), a synchronous belt (192), and a synchronous wheel (193); the synchronous wheel (193) is mounted on the end of the wheel shaft (9); the motor (191) drives the synchronous belt (192) to drive the synchronous wheel (193), the wheel shaft (9), and the paper feeding wheel (10) to rotate.

8. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 4, characterized in that: A supporting foot (7) is also installed below the main body box (18).

9. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: A top mounting plate (21) is arranged around the top of the main body box (18), and the top mounting plate (21) is located below the paper feeding pad (8).

10. The leading edge paper feeding platform with double eccentric bearing shaft lifting according to claim 1, characterized in that: The wheel shafts (9) are provided with three, and the paper feeding wheels (10) are staggeredly installed on the three wheel shafts (9); the eccentric bearing shafts (1) are provided with two and are located below the wheel shafts (9).

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