Paper feeding device capable of conveying paper at variable speed

Abstract

The utility model relates to a variable-speed conveying paper feeding device which comprises a mounting plate, a transmission shaft, a first chain wheel, a second chain wheel, a third chain wheel, a chain, an eccentric transmission assembly and an eccentric moving assembly. The first chain wheel, the second chain wheel and the third chain wheel are rotatably fixed on the mounting plate and are in transmission connection through a chain; the eccentric moving assembly comprises an adjusting plate and a telescopic air cylinder, one end of the transmission shaft is connected with a driving motor, the other end of the transmission shaft is connected with the eccentric transmission assembly, the eccentric transmission assembly is rotatably fixed to the adjusting plate, the other end of the eccentric transmission assembly is connected with a first chain wheel, and the telescopic air cylinder is fixed to the mounting plate. And the other end is rotatably fixed on the mounting plate. Compared with the prior art, the paper feeding mechanism has the advantages of being capable of feeding paper at a variable speed, enabling thin paper to make contact with the paper aligning mechanism at a low speed, guaranteeing the paper aligning effect, adjusting the structure and the like.

Description

Technical Field

[0001] The utility model relates to the field of paper feeding structures of die-cutting machines, in particular to a paper feeding device with variable speed feeding. Background Art

[0002] Existing post-printing equipment, such as flatbed die-cutting and waste stripping machines, mostly use a feeder paper feeding mechanism. The feeder paper feeding mechanism is mainly used to separate and convey the paper. At present, the feeder paper feeding mechanism mostly adopts fish-scale conveying. After the feeder feeds the paper, it is powered by the knurled shaft and conveyed to the die-cutting department through the paper feeding belt on the paper feeding table. Before the paper enters the die-cutting department, it must first reach the positioning device to make the leading edge of the paper neat before being conveyed to the die-cutting department. This can ensure the die-cutting accuracy.

[0003] With the continuous innovation and development of packaging design, the packaging materials used are no longer simple flat sheets of cardboard, ranging from 80g thin paper to various types of corrugated paper. The surface of the packaging materials has also adopted more surface treatments, such as embossing and lamination. Various new designs have brought different new problems, such as the different properties of some materials after lamination, the bending of packaging materials caused by different shrinkage rates, and the large resistance of equipment transportation. In addition, the surface friction coefficient of some glazing and calendering products becomes lower, and the equipment transportation may slip. In order to ensure that all types of materials can be accurately transported to the machine positioning device, a variable speed conveying in-place deceleration device is required to adapt to the processing of different products. Utility Model Content

[0004] The purpose of the present invention is to provide a paper feeding device with variable speed conveying in order to overcome the defect in the prior art that thin paper may be bent when conveying at the paper level position due to the high speed.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A paper feeding device with variable speed conveying includes a speed change mechanism, a first knurled shaft and a second knurled shaft. The speed change mechanism includes a mounting plate, a transmission shaft, a first sprocket, a second sprocket, a third sprocket, a chain, an eccentric transmission assembly, and an eccentric moving assembly. The first sprocket, the second sprocket, and the third sprocket are rotatably fixed to the mounting plate, arranged in a triangle, and connected by a chain transmission. The second sprocket is drivingly connected to the first knurled shaft, and the third sprocket is drivingly connected to the second knurled shaft.

[0007] The eccentric moving assembly includes an adjusting plate and a telescopic cylinder. One end of the transmission shaft is connected to a driving motor, and the other end is driven and connected to the eccentric transmission assembly. The eccentric transmission assembly is rotatably fixed on the adjusting plate, and the other end of the eccentric transmission assembly is connected to a first sprocket. The telescopic cylinder is fixed on a mounting plate. One end of the adjusting plate is connected to the telescopic rod of the telescopic cylinder, and the other end is rotatably fixed on the mounting plate.

[0008] Preferably, the eccentric transmission assembly is a spliced swing arm structure, including a first swing arm, a second swing arm, a third swing arm, a fourth swing arm and a fifth swing arm;

[0009] The transmission shaft is coaxially arranged with the first sprocket, the transmission shaft passes through the center of the first sprocket and drives the first swing arm, and the second swing arm is fixed on the first sprocket;

[0010] The fifth swing arm can be rotatably fixed on the adjustment plate, one end of the third swing arm is connected to the fifth swing arm, and the other end is connected to the first swing arm, one end of the fourth swing arm is connected to the fifth swing arm, and the other end is connected to the fourth swing arm.

[0011] Preferably, the second swing arm includes a fixed plate and a first connecting arm, wherein the fixed plate is fixed to a side of the first sprocket away from the mounting plate and is coaxially arranged with the first sprocket, and the first connecting arm is fixed to a side of the fixed plate away from the first sprocket and is connected to the fourth swing arm;

[0012] The first swing arm includes a positioning block and a second connecting arm connected to each other. A through hole is provided on the fixed plate. The through hole is coaxial with the first sprocket. The positioning block matches the shape of the through hole. The transmission shaft drives the connected positioning block. The second connecting arm is connected to the third swing arm. The distance from the connection center of the second connecting arm and the third swing arm to the center of the first sprocket is equal to the distance from the connection center of the first connecting arm and the fourth swing arm to the center of the first sprocket.

[0013] Preferably, the positioning block is provided with a connecting through hole that cooperates with the transmission shaft, a keyway is provided in the connecting through hole, and one end of the transmission shaft located in the connecting through hole is provided with a double circular key that cooperates with the keyway.

[0014] Preferably, the fifth swing arm includes a fixed ring and fourth connecting arms symmetrically distributed on both sides of the fixed ring, one end of the fourth connecting arm is connected to the third swing arm, and the other end is connected to the fourth swing arm, and the fixed ring can be rotatably fixed on the adjustment plate.

[0015] Preferably, a countersunk hole is provided on a side of the adjustment plate away from the fixing ring, and a mounting shaft, a first bearing, a first gland and a pan-head screw are provided between the adjustment plate and the fixing ring;

[0016] The first bearing is interference fit with the fixing ring, the mounting shaft passes through the first bearing and the countersunk hole and is connected with the flat head screw, the first gland is located in the countersunk hole, and the flat head screw rests on the first gland.

[0017] Preferably, the eccentric moving assembly also includes a first fixed hexagonal column and a second fixed hexagonal column, one section of the first fixed hexagonal column is fixed on the mounting plate, and the other end can be rotatably connected to one end of the adjustment plate, and the other end of the adjustment plate is provided with a waist-shaped hole, and one end of the second fixed hexagonal column is fixed on the mounting plate, and the other end can be movably fixed in the waist-shaped hole.

[0018] Preferably, a spacer is provided at one end of the second fixed hexagonal column close to the adjustment plate, and the spacer is located in the waist-shaped hole.

[0019] Preferably, the first sprocket is rotatably fixed on the mounting plate via a bearing.

[0020] Preferably, the device further comprises a tensioning wheel, the tensioning wheel is located on a side of the chain away from the first sprocket, and the tensioning wheel is engaged with the chain.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] (1) When feeding thin paper, the telescopic cylinder is activated, and one end of the adjustment plate rotates around the other end, causing the rotation axis of the eccentric transmission component to deflect, that is, eccentric to the rotation center of the first sprocket. The linear speed of the side of the first sprocket close to the rotation axis of the eccentric transmission component becomes smaller, and the paper feeding speed of the knurled shaft becomes slower. The linear speed of the other side away from the rotation axis becomes larger, and the paper feeding speed of the knurled shaft becomes faster. The variable speed transmission structure cooperates with paper transmission, and can be fast when feeding paper, and slow down when the paper is about to reach the paper aligning structure, so that the paper collides with the paper aligning structure at a low speed.

[0023] The eccentric moving component is used to adjust the rotation axis of the eccentric transmission component and the center position of the first sprocket to make them eccentric. When the first sprocket rotates, there is a speed change stage within a complete cycle. In coordination with the paper feeding rhythm, thin paper is fed quickly, and the speed is reduced when it is about to contact the paper aligning structure to reduce inertia. When contacting the paper aligning structure at a low speed, the problem of thin paper bending due to excessive speed and poor paper aligning effect is avoided. The adjustment is convenient, efficient and responsive.

[0024] (2) In this solution, the rotation center of the fifth swing arm is set on the adjustment plate, and a waist-shaped hole is set on the adjustment plate. The left and right positions of the adjustment plate are limited in conjunction with the hexagonal fixing column. The rotation center of the fifth swing arm corresponds to the coaxial and eccentric positions of the first sprocket. The position of the adjustment plate is switched by a telescopic cylinder, so that the adjustment of the speed change structure is convenient and the response is fast. The structure is simple, the subsequent maintenance is convenient, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of the paper feeding device provided by the present invention;

[0026] Figure 2This is a schematic diagram of the exploded structure of the speed change mechanism provided by the present utility model;

[0027] Figure 3 A schematic structural diagram of the first swing arm provided by the utility model;

[0028] Figure 4 This is a schematic structural diagram of the second swing arm provided by the utility model;

[0029] Figure 5 This is a schematic structural diagram of the fifth swing arm provided by the present utility model;

[0030] Figure 6 This is a schematic structural diagram of the fifth swing arm provided by the present invention, in which the rotation center is concentric with the center of the first sprocket;

[0031] Figure 7 This is a schematic structural diagram of the eccentricity between the rotation center of the fifth swing arm and the center of the first sprocket provided by the utility model;

[0032] In the figure: 1. mounting plate, 2. transmission shaft, 3. first sprocket, 4. second sprocket, 5. third sprocket, 6. chain, 7. eccentric transmission assembly, 8. eccentric moving assembly, 9. tensioner, 10. first knurled shaft, 11. second knurled shaft, 12. speed change mechanism; 21. double round key, 71. first swing arm, 72. second swing arm, 73. third swing arm, 74. fourth swing arm, 75. fifth swing arm; 711. positioning block, 712. second connecting arm, 721. fixing plate, 722. first connecting arm, 751. fixing ring, 752. fourth connecting arm, 753. mounting shaft, 754. first pressure cover, 755. dish head screw; 81. adjusting plate, 82. telescopic cylinder, 83. first fixed hexagonal column, 84. second fixed hexagonal column, 811. waist-shaped hole. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0037] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0038] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, this embodiment provides a paper feeding device with variable speed conveying, including a speed change mechanism 12, a first knurled shaft 10 and a second knurled shaft 11. The speed change mechanism includes a mounting plate 1, a transmission shaft 2, a first sprocket 3, a second sprocket 4, a third sprocket 5, a chain 6, an eccentric transmission assembly 7 and an eccentric moving assembly 8; the first sprocket 3, the second sprocket 4 and the third sprocket 5 are rotatably fixed to the mounting plate 1, distributed in a triangular shape, and are connected by the chain 6. The second sprocket 4 is driven and connected to the first knurled shaft, and the third sprocket 5 is driven and connected to the second knurled shaft;

[0041] The eccentric moving assembly 8 includes an adjusting plate 81 and a telescopic cylinder 82. One end of the transmission shaft 2 is connected to a driving motor, and the other end is driven and connected to the eccentric transmission assembly 7. The eccentric transmission assembly 7 can be rotatably fixed on the adjusting plate 81. The other end of the eccentric transmission assembly 7 is connected to the first sprocket 3. The telescopic cylinder 82 is fixed on the mounting plate 1. One end of the adjusting plate 81 is connected to the telescopic rod of the telescopic cylinder 82, and the other end can be rotatably fixed on the mounting plate 1.

[0042] Working principle: When paper is generally conveyed, the eccentric transmission assembly 7 is coaxial with the rotation center of the first sprocket 3. The transmission shaft 2 of the driving motor drives the first sprocket 3 to rotate through the eccentric moving assembly 8, and the chain 6 drives the second sprocket 4 and the third sprocket 5 to rotate. Then, the first knurled shaft and the second knurled shaft drive the paper to move at a uniform speed.

[0043] When feeding thin paper, the telescopic cylinder 82 is actuated, and one end of the adjustment plate 81 rotates around the other end, causing the rotation axis of the eccentric transmission assembly 7 to deflect, that is, eccentric to the rotation center of the first sprocket 3. The linear velocity of the side of the first sprocket 3 close to the rotation axis of the eccentric transmission assembly 7 becomes smaller, and the paper feeding speed of the knurled shaft becomes slower, and the linear velocity of the other side away from the rotation axis becomes larger, and the paper feeding speed of the knurled shaft becomes faster. This variable speed transmission structure cooperates with paper transmission, and can be fast when feeding paper, and slow down when the paper is about to reach the paper aligning structure, so that the paper collides with the paper aligning structure at a low speed.

[0044] The eccentric moving component 8 adjusts the rotation axis of the eccentric transmission component 7 and the center position of the first sprocket 3 to make them eccentric, so that when the first sprocket 3 rotates, there is a speed change stage within a complete cycle, which cooperates with the paper feeding rhythm to feed thin paper quickly, slows down when it is about to contact the paper aligning structure, reduces inertia, and avoids the problem of thin paper bending due to excessive speed and poor paper aligning effect when contacting the paper aligning structure at a low speed. The adjustment is convenient and efficient, and the response is quick.

[0045] In a preferred embodiment, the eccentric transmission assembly 7 is a spliced swing arm structure, including a first swing arm 71, a second swing arm 72, a third swing arm 73, a fourth swing arm 74 and a fifth swing arm 75, and the third swing arm 73 and the fourth swing arm 74 are equal in length;

[0046] The transmission shaft 2 is coaxially arranged with the first sprocket 3. The transmission shaft 2 passes through the center of the first sprocket 3 and is driven to connect with the first swing arm 71. The second swing arm 72 is fixed on the first sprocket 3.

[0047] The fifth swing arm 75 can be rotatably fixed on the adjustment plate 81 , one end of the third swing arm 73 is connected to the fifth swing arm 75 , and the other end is connected to the first swing arm 71 , one end of the fourth swing arm 74 is connected to the fifth swing arm 75 , and the other end is connected to the fourth swing arm 74 .

[0048] Furthermore, the second swing arm 72 includes a fixed plate 721 and a first connecting arm 722. The fixed plate 721 is fixed to a side of the first sprocket 3 away from the mounting plate 1 and is coaxially arranged with the first sprocket 3. The first connecting arm 722 is fixed to a side of the fixed plate 721 away from the first sprocket 3 and is connected to the fourth swing arm 74.

[0049] The first swing arm 71 includes a positioning block 711 and a second connecting arm 712 that are connected to each other. A through hole is provided on the fixed plate 721, and the through hole is coaxial with the first sprocket 3. The positioning block 711 matches the shape of the through hole. The transmission shaft 2 drives the connected positioning block 711. The second connecting arm 712 is connected to the third swing arm 73. The distance from the connection center of the second connecting arm 712 and the third swing arm 73 to the center of the first sprocket 3 is equal to the distance from the connection center of the first connecting arm 722 and the fourth swing arm 74 to the center of the first sprocket 3.

[0050] Specifically, the positioning block 711 is provided with a connecting through hole that matches the transmission shaft 2, and a keyway is provided in the connecting through hole. One end of the transmission shaft 2 located in the connecting through hole is provided with a double circular key 21, and the double circular key 21 matches the keyway.

[0051] Furthermore, the fifth swing arm 75 includes a fixed ring 751 and a fourth connecting arm 752 symmetrically distributed on both sides of the fixed ring 751. One end of the fourth connecting arm 752 is connected to the third swing arm 73, and the other end is connected to the fourth swing arm 74. The fixed ring 751 can be rotatably fixed on the adjustment plate 81.

[0052] A countersunk hole is provided on the side of the adjustment plate 81 away from the fixing ring 751 , and a mounting shaft 753 , a first bearing, a first pressure cover 754 and a flat head screw 755 are provided between the adjustment plate 81 and the fixing ring 751 ;

[0053] The first bearing is interference fit with the fixing ring 751 , the mounting shaft 753 passes through the first bearing and the countersunk hole and is connected to the flat head screw 755 , the first pressure cover 754 is located in the countersunk hole, and the flat head screw 755 rests on the first pressure cover 754 .

[0054] The eccentric moving assembly 8 also includes a first fixed hexagonal column 83 and a second fixed hexagonal column 84. One section of the first fixed hexagonal column 83 is fixed on the mounting plate 1, and the other end can be rotatably connected to one end of the adjustment plate 81. The other end of the adjustment plate 81 is provided with a waist-shaped hole 811. One end of the second fixed hexagonal column 84 is fixed on the mounting plate 1, and the other end can be movably fixed in the waist-shaped hole 811.

[0055] Specifically, a spacer is provided at one end of the second fixed hexagonal column 84 close to the adjustment plate 81, and the spacer is located in the waist-shaped hole 81. The first sprocket 3 is rotatably fixed on the mounting plate 1 through a bearing.

[0056] The rotation center of the fifth swing arm is set on the adjustment plate, and a waist-shaped hole is set on the adjustment plate. The left and right positions of the adjustment plate are limited by the hexagonal fixing column. The rotation center of the fifth swing arm corresponds to the coaxial and eccentric positions of the first sprocket. The position of the adjustment plate is switched by a telescopic cylinder, which makes the adjustment of the speed change structure convenient and responsive. The structure is simple, subsequent maintenance is convenient, and the cost is low.

[0057] Furthermore, the device further comprises a tensioning wheel 9, which is located on a side of the chain 6 away from the first sprocket 3 and is engaged with the chain 6. The tensioning wheel 9 ensures the transmission effect of the chain 6 on the first sprocket 3, the second sprocket 4 and the third sprocket 5.

[0058] In this embodiment, when the telescopic cylinder 82 is extended and the right side of the long waist hole on the adjustment plate is concentric with the second fixed mounting post, the rotation center of the fifth swing arm 75 is concentric with the center of the fixed plate 721 of the second swing arm 72 and the center of the first sprocket 3. The first sprocket 3, through the chain 6, drives the knurled shaft sprockets, causing the first knurled shaft 10 and the second knurled shaft 11 to rotate at a uniform speed, driving the paper to be transported at a uniform speed. At this time, the angular velocities of the two sides of the first sprocket 3 are synchronized. When the angular velocities are synchronized, the knurled shafts transport the paper at a uniform speed without speed difference, reducing the delay in the arrival of curved paper and the early arrival of slippery paper, making it suitable for transporting curved or slippery paper.

[0059] When the telescopic cylinder 82 is retracted and the left side of the long waist hole on the adjustment plate 81 is concentric with the second fixed mounting post, the rotation center of the fifth swing arm 75 is eccentric with the center of the fixed plate 721 of the second swing arm 72 and the center of the first sprocket 3, and the fifth swing arm 75 rotates at the same angle around the rotation center of the fifth swing arm 75. Because the distance from the first connecting arm 722 on the first sprocket 3 to the rotation center of the fifth swing arm 75 is not equal, the circumference of the path corresponding to the close radius of the first sprocket 3 is relatively short, the knurled shaft rotates slowly, and the paper feed speed is slow. The circumference of the path corresponding to the long radius of the third sprocket 3 is relatively long, the knurled shaft rotates quickly, and the paper feed speed is fast.

[0060] This variable-speed paper feed mode is mainly designed for feeding thin paper. If the paper feed speed is fast, the thin paper will be easily deformed when it contacts the paper aligning mechanism, resulting in poor paper alignment. However, in the variable-speed paper feed mode, the knurled shaft rotates quickly during paper feeding, and the paper feed speed is fast. When the paper is about to reach the paper aligning mechanism, the knurled shaft slows down, the paper feed speed slows down, reducing inertia, and the paper contacts the paper aligning mechanism at a low speed, thereby reducing bending and improving paper alignment. This solves the problem of thin paper bending when it quickly reaches the positioning device, ensuring the accuracy of the die-cutting process in the next step. The above two modes can be switched according to the customer's paper and product requirements, making the paper feed device more applicable and ensuring the alignment effect of the paper aligning mechanism.

[0061] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A paper feeding device with variable speed conveying, comprising a speed changing mechanism, a first knurled shaft and a second knurled shaft, characterized in that: The speed change mechanism comprises a mounting plate (1), a transmission shaft (2), a first sprocket (3), a second sprocket (4), a third sprocket (5), a chain (6), an eccentric transmission assembly (7) and an eccentric moving assembly (8); the first sprocket (3), the second sprocket (4) and the third sprocket (5) are rotatably fixed on the mounting plate (1), distributed in a triangular shape, and are connected by a chain (6); the second sprocket (4) is connected to the first knurled shaft in a driving manner, and the third sprocket (5) is connected to the second knurled shaft in a driving manner; The eccentric moving assembly (8) comprises an adjusting plate (81) and a telescopic cylinder (82); one end of the transmission shaft (2) is connected to a driving motor, and the other end is driven and connected to an eccentric transmission assembly (7); the eccentric transmission assembly (7) is rotatably fixed on the adjusting plate (81); the other end of the eccentric transmission assembly (7) is connected to a first sprocket (3); the telescopic cylinder (82) is fixed on a mounting plate (1); one end of the adjusting plate (81) is connected to a telescopic rod of the telescopic cylinder (82), and the other end is rotatably fixed to the mounting plate (1).

2. The paper feeding device with variable speed conveying according to claim 1, characterized in that: The eccentric transmission assembly (7) is a spliced swing arm structure, comprising a first swing arm (71), a second swing arm (72), a third swing arm (73), a fourth swing arm (74) and a fifth swing arm (75); The transmission shaft (2) is coaxially arranged with the first sprocket (3), the transmission shaft (2) passes through the center of the first sprocket (3) and drives the first swing arm (71), and the second swing arm (72) is fixed on the first sprocket (3); The fifth swing arm (75) is rotatably fixed on the adjustment plate (81); one end of the third swing arm (73) is connected to the fifth swing arm (75), and the other end is connected to the first swing arm (71); one end of the fourth swing arm (74) is connected to the fifth swing arm (75), and the other end is connected to the fourth swing arm (74).

3. The paper feeding device with variable speed conveying according to claim 2, characterized in that: The second swing arm (72) comprises a fixed plate (721) and a first connecting arm (722), wherein the fixed plate (721) is fixed to a side of the first sprocket (3) away from the mounting plate (1) and is coaxially arranged with the first sprocket (3), and the first connecting arm (722) is fixed to a side of the fixed plate (721) away from the first sprocket (3) and is connected to the fourth swing arm (74); The first swing arm (71) comprises a positioning block (711) and a second connecting arm (712) connected to each other. A through hole is provided on the fixed disk (721). The through hole is coaxial with the first sprocket (3). The positioning block (711) matches the shape of the through hole. The transmission shaft (2) drives the connected positioning block (711). The second connecting arm (712) is connected to the third swing arm (73). The distance between the connection center of the second connecting arm (712) and the third swing arm (73) and the center of the first sprocket (3) is equal to the distance between the connection center of the first connecting arm (722) and the fourth swing arm (74) and the center of the first sprocket (3).

4. The paper feeding device with variable speed conveying according to claim 3, characterized in that: The positioning block (711) is provided with a connecting through hole that matches the transmission shaft (2), a keyway is provided in the connecting through hole, and a double circular key (21) is provided at one end of the transmission shaft (2) located in the connecting through hole, and the double circular key (21) matches the keyway.

5. The paper feeding device with variable speed conveying according to claim 2, characterized in that: The fifth swing arm (75) comprises a fixing ring (751) and fourth connecting arms (752) symmetrically distributed on both sides of the fixing ring (751); one end of the fourth connecting arm (752) is connected to the third swing arm (73), and the other end is connected to the fourth swing arm (74); the fixing ring (751) is rotatably fixed on the adjustment plate (81).

6. The paper feeding device with variable speed conveying according to claim 5, characterized in that: A countersunk hole is provided on one side of the adjustment plate (81) away from the fixing ring (751); a mounting shaft (753), a first bearing, a first pressure cover (754) and a flat head screw (755) are provided between the adjustment plate (81) and the fixing ring (751); The first bearing is interference-fitted with the fixing ring (751), the mounting shaft (753) passes through the first bearing and the countersunk hole and is connected to the flat head screw (755), the first pressure cover (754) is located in the countersunk hole, and the flat head screw (755) abuts against the first pressure cover (754).

7. The paper feeding device with variable speed conveying according to claim 1, characterized in that: The eccentric moving assembly (8) further comprises a first fixed hexagonal column (83) and a second fixed hexagonal column (84), wherein one end of the first fixed hexagonal column (83) is fixed to the mounting plate (1), and the other end is rotatably connected to one end of the adjustment plate (81), and the other end of the adjustment plate (81) is provided with a waist-shaped hole (811), and one end of the second fixed hexagonal column (84) is fixed to the mounting plate (1), and the other end is movably fixed in the waist-shaped hole (811).

8. The paper feeding device with variable speed conveying according to claim 7, characterized in that: A spacer is provided at one end of the second fixed hexagonal column (84) close to the adjustment plate (81), and the spacer is located in the waist-shaped hole (811).

9. The paper feeding device with variable speed conveying according to claim 1, characterized in that: The first sprocket (3) is rotatably fixed on the mounting plate (1) via a bearing.

10. The paper feeding device with variable speed conveying according to claim 1, characterized in that: The device further comprises a tensioning wheel (9), which is located on a side of the chain (6) away from the first sprocket (3), and the tensioning wheel (9) is engaged with the chain (6).

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