An automatic blade sharpening device for paper cutter blades

Abstract

This invention discloses an automatic blade sharpening device for a paper cutter. It features a paper presser movably mounted on a base B, a sharpener movably connected to the paper presser and in contact with the paper cutter's blade for automatic sharpening, the sharpener comprising a sharpening base movably connected to the paper presser, a sharpening element connected to the sharpening base and capable of contacting the blade, and an elastic element disposed between the paper presser and the sharpening base. This invention, by installing a floating sharpening element on the paper presser, achieves automatic sharpening during paper cutting, increasing the cutting workload per blade, reducing the number of blade replacements, improving the paper cutter's efficiency, reducing safety risks, and lowering the paper cutter's operating costs.

Description

Technical Field

[0001] This invention relates to paper cutters, specifically to an automatic blade sharpening device for paper cutter blades. Background Technology

[0002] Paper cutters are post-printing equipment used for cutting paper. During the paper cutting process, the cutting blades wear down, affecting the cutting output per blade. When the cutting blades wear down, they need to be sharpened. Existing sharpening methods involve removing the blades from the cutter holder, sharpening them using a dedicated sharpening device, and then reinstalling them, thus impacting work efficiency. Furthermore, because the blades are very sharp, there are certain safety risks during operation. Therefore, the disassembly, transportation, installation, and adjustment of the blades are generally performed by professionals, resulting in high costs and a high risk factor. To address these issues, this invention proposes an automatic blade sharpening device for paper cutter blades that can improve work efficiency and reduce costs and safety risks. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of low efficiency, high cost, and high safety risk caused by the need to remove the cutter from the cutter holder and then sharpen it with a separate sharpening device in the prior art. Therefore, this invention proposes an automatic sharpening device for paper cutter cutters.

[0004] To achieve the above objectives, the present invention provides an automatic sharpening device for a paper cutter blade, characterized by including a paper presser movably mounted on a base frame B, a sharpening device movably connected to the paper presser and in contact with the paper cutter blade for automatic sharpening, the sharpening device including a sharpening base movably connected to the paper presser, a sharpening component connected to the sharpening base and capable of contacting the cutter blade, and an elastic element disposed between the paper presser and the sharpening base.

[0005] Furthermore, it also includes a transmission component and a drive mechanism mounted on the paper presser and driven by the transmission component to move the grinding blade base on the paper presser. The drive mechanism includes a transmission arm, a rotating shaft driven by the transmission arm, a deflection sleeve connected to the rotating shaft, and a pulley connected to the grinding blade base and cooperating with the deflection sleeve. The transmission component is connected in a fixed or detachable manner to a component that protrudes from the transmission component to drive the transmission arm to move.

[0006] Preferably, the deflection sleeve is provided with a circumferential surface and a concave surface that are adapted to the pulley.

[0007] Furthermore, the transmission arm is also provided with an upper impact plate and a lower impact plate, which are integral or separate structures with the transmission arm; the transmission arm and the rotating shaft also include a linkage component for the transmission arm to drive the rotating shaft to rotate.

[0008] Furthermore, the drive mechanism that is set on the paper presser and driven by the transmission component to drive the grinding blade base to move on the paper presser is replaced with a drive mechanism set on the paper presser to drive the grinding blade base to move on the paper presser; the drive mechanism set on the paper presser to drive the grinding blade base to move on the paper presser includes a drive frame movably connected to the paper presser, the drive frame includes a drive rod that can move through the paper presser and the grinding blade base, a curved plate connected to the drive rod, and a drive roller connected to the grinding blade base and cooperating with the curved plate.

[0009] Preferably, the paper presser also includes an upper crossbeam and a lower crossbeam connected to both ends of the drive rod.

[0010] Preferably, the curved plate has a curved surface adapted to the drive roller, with a flange on the upper side and a plane on the lower side of the curved surface.

[0011] Furthermore, it also includes a top plate that is movably mounted on the upper crossbeam and a flexible pad that is mounted on the top plate or the upper crossbeam.

[0012] Furthermore, it also includes a selection structure provided on the upper crossbeam and the top plate for selecting whether to perform sharpening. The selection structure includes a deflection groove provided on the upper crossbeam and a guide rod provided on the top plate that is adapted to the deflection groove.

[0013] Preferably, the number of grinding tools mounted on the grinding base is one or more.

[0014] Furthermore, it also includes an elastic adjustment element installed between the grinding base and the grinding tool.

[0015] The beneficial effects of this invention are as follows: by installing a floating sharpening component on the paper presser, automatic sharpening is achieved during the paper cutting process, which increases the cutting workload of a single blade, reduces the number of blade replacements, improves the working efficiency of the paper cutter, reduces the safety risk factor, and lowers the operating cost of the paper cutter. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0017] Appendix Figure 2 This is a front view structural diagram of Embodiment 1 of the present invention;

[0018] Appendix Figure 3 This is a schematic diagram of the paper press and the knife sharpener in Embodiment 1 of the present invention;

[0019] Appendix Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0020] Appendix Figure 5 This is a schematic diagram of the paper press and the knife sharpener in Embodiment 2 of the present invention;

[0021] Appendix Figure 6 This is a schematic diagram of the grinding base in Embodiment 2 of the present invention;

[0022] Appendix Figure 7 This is a schematic diagram of the transmission arm in Embodiment 2 of the present invention;

[0023] Appendix Figure 8 This is an appendix to the present invention. Figure 5 A magnified view of part A in the diagram;

[0024] Appendix Figure 9 This is a schematic diagram of the deflection sleeve in Embodiment 2 of the present invention;

[0025] Appendix Figure 10 This is a schematic diagram of the paper press and the knife sharpener in Embodiment 3 of the present invention;

[0026] Appendix Figure 11 This is another structural schematic diagram of the paper press and the knife sharpener in Embodiment 3 of the present invention;

[0027] Appendix Figure 12 This is a schematic diagram of the paper press and the knife sharpener from another perspective in Embodiment 3 of the present invention;

[0028] Appendix Figure 13 This is a schematic cross-sectional view of the paper press and the sharpener in Embodiment 3 of the present invention;

[0029] Appendix Figure 14 This is a schematic diagram of the grinding base in Embodiment 3 of the present invention;

[0030] Appendix Figure 15 This is a schematic diagram of the curve plate in Embodiment 3 of the present invention;

[0031] Appendix Figure 16 This is a schematic diagram of the structure of Embodiment 4 in this invention;

[0032] Appendix Figure 17 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0033] Appendix Figure 18 This is a partial exploded view of Embodiment 5 of the present invention.

[0034] Legend: B. Base frame; 1. Left upright plate assembly; 2. Bottom beam; 3. Paper presser; 4. Cutter holder; 5. Right upright plate assembly; 6. Front crossbeam; 7. Rear crossbeam; 8. Guide rod; 9. Transmission component; 11. Component; 12. Positioning guide post; 13-1. Grinding knife base; 13-2. Grinding knife component; 14. Elastic component; 14-1. Elastic adjustment component; 15. Upper crossbeam; 16. Top plate; 17. Flexible pad; 18. Lower crossbeam; 19. Drive 20. Roller; 20-1. Curved plate; 20-2. Curved surface; 20-3. Flange; 20-4. Plane; 21. Drive rod; 23. Pulley; 24. Linkage component; 25. Transmission arm; 26. Upper impact plate; 27. Lower impact plate; 28. Deflection sleeve; 28-1. Circumferential surface; 28-2. Concave circular surface; 29. ​​Rotary shaft; 30. Support frame; 100. Cutter; 111. Mounting hole; 121. Guide groove; 138. Deflection groove; 139. Guide rod. Implementation

[0035] The automatic sharpening device for paper cutter blades according to the present invention will now be further described in conjunction with the accompanying drawings. To further explain the invention, the base frame B is composed of a bottom beam 2, a left upright plate assembly 1 and a right upright plate assembly 5 mounted on the bottom beam 2, and a front crossbeam 6 and a rear crossbeam 7 mounted on the left upright plate assembly 1 and the right upright plate assembly 5. A guide rod 8 is provided on the base frame B, and a paper presser 3 is slidably mounted on the guide rod 8. The paper presser 3 is driven by a drive mechanism (such as a servo mechanism, cylinder, hydraulic cylinder, electric push rod, or other push-pull device) to move up and down on the base frame B based on the guide rod 8. The base frame B is also provided with a cutter holder 4 for loading the cutter 100, which is movably connected to the transmission component 9. The cutter holder is movably connected to the transmission component 9, and the driven mechanism (such as a servo mechanism, cylinder, hydraulic cylinder, electric push rod, or other push-pull device) of the transmission component 9 drives the cutter holder 4 to move and perform paper cutting. The working paper presser first descends and presses down on the paper stack or the bottom beam 2, and then the cutter holder 4 drives the cutter 100 to descend and perform the paper cutting action.

[0036] The sharpening component 13-2 described below can be any sharpening tool that can sharpen a cutting blade, such as a sharpening blade, sharpening paper, sharpening stone, sandpaper, or sharpening plate. Example 1

[0037] See Figure 1-3 As shown, an automatic sharpening device for a paper cutter blade is characterized by a paper presser 3 movably mounted on a base frame B, a sharpening device that is movably connected to the paper presser 3 and in contact with the paper cutter blade 100 of the paper cutter to automatically sharpen the blade 100, the sharpening device comprising a sharpening base 13-1 movably connected to the paper presser 3, a sharpening element 13-2 connected to the sharpening base 13-1 and capable of contacting the blade 100, and an elastic element 14 disposed between the paper presser 3 and the sharpening base 13-1;

[0038] The elastic element 14 can be installed in the paper presser 3 or the grinding blade base by setting a mounting hole 111 or a mounting groove on the paper presser 3 or the grinding blade base, so that it is located between the two, thereby realizing the movable connection between the grinding blade base 13-1 and the paper presser 3; the elastic element 14 can be an elastic component such as a spring, compression spring, spring sheet, or elastic rubber workpiece that can make the paper presser 3 and the grinding blade base 13-1 movablely connected.

[0039] In application, the paper presser 3 descends and presses onto the paper stack or the bottom beam 2. Simultaneously, the paper presser lowers, driving the sharpener to descend as well. During this descent, the sharpening element 13-2 of the sharpener momentarily protrudes from the paper presser 3 and comes into contact with the cutter 100. Therefore, before the paper presser 3 presses onto the paper stack, the sharpening element 13-2 on the sharpener will first contact the cutter 100, generating friction and achieving automatic sharpening. Then, the cutter holder 4 drives the cutter 100 to cut the paper stack. During the descent of the cutter 100, it does not contact the sharpening element 13-2 on the sharpener. After cutting the paper, the cutter 100 first resets, and during this reset process, it can also contact the sharpening element 13-2 once to achieve automatic sharpening. Automatic sharpening increases the cutting workload per blade, reduces the number of blade replacements, improves the efficiency of the paper cutter, reduces safety risks, and lowers the operating cost of the paper cutter.

[0040] During operation, an elastic element 14 is installed between the paper presser 3 and the grinding blade base 13-1, so that the paper presser 3 and the grinding blade base 13-1 are movably connected, thereby making the grinding blade 13-2 float. When the grinding blade 13-2 comes into contact with the cutter 100 and friction occurs, a squeezing force is generated, which allows the grinding blade base 3-1 to move on the paper presser 3. Example 2

[0041] See Figure 3-9 As shown in the figure, the difference between this embodiment and embodiment 1 is that this embodiment also includes a transmission component 9 and a driving mechanism that is driven by the transmission component 9 to move the grinding base 13-1 on the paper presser 3. The driving mechanism includes a transmission arm 25, a rotating shaft 29 driven by the transmission arm 25, a deflection sleeve 28 connected to the rotating shaft 29, and a pulley 23 connected to the grinding base 13-1 and cooperating with the deflection sleeve 28. The pulley 23 can be directly mounted on the grinding base 13-1 and connected to it, or it can be connected to the grinding base 13-1 through any kind of linkage component that can drive the grinding base 13-1 to move, such as a plate, column, or wheel.

[0042] The linkage component is connected to it; the transmission arm 25 and the rotating shaft 29 can be directly connected or connected by a linkage component 24 between them; the pulley 23 can be columnar or wheel-shaped, with wheel-shaped preferred; the transmission component 9 is connected to a component 11 protruding from the transmission component 9 to drive the transmission arm 25 to move by means of a fixed, detachable, or retractable method. The component 11 is preferably connected to the transmission component 9 in a retractable or detachable manner, using a pin connection, steel ball positioning, etc. When sharpening is not required, the component 11 can simply be retracted or removed from the transmission component 9. The component 11 can be columnar, plate-shaped, block-shaped, or any other component protruding from the transmission component 9 to drive the transmission arm 25, with a pin structure preferred;

[0043] The deflection sleeve 28 is provided with a circumferential surface 28-1 and a concave circular surface 28-2 adapted to the pulley 23;

[0044] The transmission arm 25 is also provided with an upper impact plate 26 and a lower impact plate 27. The upper impact plate 26 and the lower impact plate 27 are integrated with the transmission arm 25 or are separate structures. The transmission arm 25 and the rotating shaft 29 are also provided with a linkage component 24 for the transmission arm 25 to drive the rotating shaft 29 to rotate. The linkage component 24 is a component of other shapes such as plate, block, column or wheel for the transmission arm 25 to drive the rotating shaft 29 to rotate. Plate or block components are preferred. The linkage component 24 can be integrated with one of the components of the transmission arm 25 and the rotating shaft 29 or be separate structures.

[0045] In application, the paper presser 3 moves downwards until it contacts the paper stack or the bottom beam 2. The cutter 4 then performs a downward cutting motion to the bottom. During this cutting motion, the transmission component 9 drives the component 11 to move. When the component 11 contacts the lower impact plate 27 of the transmission arm 25, the lower impact plate 27 of the transmission arm 25 moves to the left under continuous motion. This causes the transmission arm 25 to move or rotate to the left. The transmission arm 25 then drives the rotating shaft 29 to rotate to the left or causes the linkage component 24 to swing to the left, causing the linkage component 24 to drive the rotating shaft 29 to rotate to the left. 9. Turn left, the rotating shaft 29 drives the deflection sleeve 28 to rotate, so that the concave circular surface 28-2 of the deflection sleeve 28 corresponds to the pulley 23. At this time, under the elastic force of the elastic element 14, the grinding base 13-1 is moved forward, and the grinding part 13-2 is moved forward and attached to the inner plane of the cutter holder 4 or the cutter 100. When the cutter holder 4 drives the cutter 100 to reset from the bottom to the top, the grinding part 13-2 contacts the cutter 100 and generates relative motion to grind the cutter 100.

[0046] When the cutter holder 4 is about to reach the upper position during its reset, component 11 contacts the upper impact plate 26 and drives the transmission arm 25. The transmission arm 25 drives the rotating shaft 29 to rotate to the right or drives the linkage 24 to swing to the right, causing the linkage 24 to drive the rotating shaft 29 to rotate to the right. The rotating shaft 29 drives the deflection sleeve 28 to rotate to the right, so that the circumferential surface 28-1 on the deflection sleeve 28 corresponds to the pulley 23. After overcoming the elastic force of the elastic element 14, the sharpening component 13-2 retracts and maintains a gap with the cutter holder 4 or the cutter 100. At this time, the paper presser 3 will not rub against the cutter holder 4 during the reset process, that is, there will be no sharpening action. This embodiment realizes automatic sharpening of the cutter holder 4 during the process of returning from the bottom to the upper position, without occupying additional sharpening time and machine power. Therefore, it also realizes automatic sharpening, increases the cutting workload of a single blade, reduces the number of blade replacements, improves the working efficiency of the paper cutter, reduces the safety risk factor, and reduces the operating cost of the paper cutter. Example 3

[0047] See Figure 1-3 and Figure 10-15 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment also includes a driving mechanism disposed on the paper presser 3 for driving the grinding blade base 13-1 to move on the paper presser 3. The difference between this embodiment and Embodiment 2 is that the driving mechanism is not driven by the transmission component 9, but is disposed on the paper presser 3 for driving the grinding blade base 13-1 to move on the paper presser 3. The driving mechanism includes a driving frame movably connected to the paper presser 3. The driving frame includes a driving rod 21 that can move through the paper presser 3 and the grinding blade base 13-1, a curved plate 20 connected to the driving rod 21, and a driving roller 19 connected to the grinding blade base 13-1 and cooperating with the curved plate 20. The driving roller 19 can be columnar or wheel-shaped, with wheel-shaped being preferred. The driving roller 19 can be directly mounted on and connected to the grinding blade base 13-1, or it can be connected to the grinding blade base 13-1 through a linkage component that can drive the grinding blade base 13-1 to move in any of the following ways: plate-shaped, columnar, or wheel-shaped.

[0048] The paper presser 3 also includes an upper crossbeam 15 and a lower crossbeam 18 connected to both ends of the drive rod 21. The upper crossbeam 15 and the lower crossbeam 18 can limit the movement of the drive rod 21 up and down.

[0049] The curved plate 20 is provided with a curved surface 20-1 adapted to the drive roller 19, a flange 20-2 on the upper side of the curved surface 20-1 and a plane 20-3 on the lower side;

[0050] It also includes a top plate 16 that is movably mounted on the upper crossbeam 15 and a flexible pad 17 mounted on the top plate 16 or the upper crossbeam 15;

[0051] When the paper presser 3 is in the upper position of the upper base frame B and has not descended, the flexible pad 17 on the top plate 16 presses against the rear crossbeam 7 of the base frame B, and the drive rod 21 is at the lowest position of its travel stroke. At this time, the flange 20-2 of the curved plate 20 presses against the drive roller 19, so that the grinding base 13- overcomes the elastic force of the elastic element 14, and the grinding base 13-1 and the grinding element 13-2 are in the retracted state.

[0052] When cutting paper, the paper presser 3 moves downward a certain distance, and the flexible pad 17 leaves the rear crossbeam 7 of the paper cutter. At this time, the drive frame is no longer under downward pressure. The elastic force of the elastic element 14 causes the drive roller 19 to be engaged with the curved surface 20-1. At this time, the grinding base 13-1 is driven forward a certain distance by the elastic force of the elastic element 14, so that the grinding element 13-2 is attached to the inner plane of the cutter frame 4 or the cutter 100. As the paper presser 3 continues to move downward, it drives the grinding element 13-2 to make relative movement and contact with the cutter 100 on the cutter frame 4, thereby grinding the cutter 100. Since the lower crossbeam is set at the lower end of the paper presser 3 and the upper crossbeam is set at the upper end of the paper presser 3, they are respectively connected to the upper and lower ends of the drive rod 21, and the drive rod 21 Through the through holes on the paper presser 3 and the sharpening base 13-1, which facilitate the passage of the drive rod 21, the paper presser 3 and the sharpening base 13-1 move together. Therefore, when the paper presser 3 presses against the paper stack or the bottom beam 2, the lower crossbeam 18 drives the drive rod 21 and the curved plate 20 to move upward. This causes the plane 20-3 of the curved plate 20 to press against the drive roller 19, allowing the sharpening base 13-1 to overcome the elastic force of the elastic element 14. This also puts the sharpening base 13-1 and the sharpening element 13-2 in a retracted position. At the same time, because the drive roller 19 is stuck in the plane 20-3, the sharpening element 13-2 is reliably and stably in a retracted state. In this embodiment, the sharpening element 13-2 rubs against the cutter 100 during the downward movement of the paper presser 3, thus automatically sharpening the cutter 100. Example 4

[0053] See Figure 1-3 and Figure 10-16 As shown, the difference between this embodiment and embodiment 2 is that this embodiment also includes a selection structure for selecting whether to perform sharpening, which is provided on the upper crossbeam 15 and the top plate 16. The selection structure includes a deflection groove 138 provided on the upper crossbeam 15 and a guide rod 139 provided on the top plate 16 that is adapted to the deflection groove 138.

[0054] When the user does not need to sharpen the blade temporarily, simply rotate the top plate 16 by an angle so that the flexible pad 17 on the top plate 16 is misaligned with the rear crossbeam 7 and cannot press against the rear crossbeam 7 of the paper cutter. The drive roller 19 is kept locked at the plane 20-3 below the curved surface 20-1, so that the upper end of the lower crossbeam 18 is kept flush with the bottom surface of the paper press frame 3, so that the sharpening component 13-2 is reliably and stably in the retracted state. During the paper cutting process, the sharpening component 13-2 and the cutter frame 4 always maintain a gap, and no sharpening action will occur. Example 5

[0055] See Figure 3 , Figures 17-18 As shown, the difference between this embodiment and embodiments 1-4 is that in this embodiment, the number of grinding tools 13-2 installed on the grinding base 13-1 is one or more;

[0056] When there are multiple grinding tools 13-2, an elastic adjusting member 14-1 is also included, which is installed between the grinding base 13-1 and the grinding tool 13-2; the elastic adjusting member 14-1 may be a spring elastic sheet or elastic rubber.

[0057] By setting the elastic adjustment element 14-1, the grinding tool 13-2 is floatingly mounted on the grinding tool base 13-1. The elastic floating setting can reduce the flatness requirement of the grinding surface on the grinding tool 13-2, which is beneficial to reducing costs.

[0058] See Figure 3 As shown, in one embodiment, it also includes a positioning guide post 12 that passes through the grinding base 13-1 and connects to the paper presser 3, and a guide groove 121 that is provided on the grinding base 13-1 and cooperates with the positioning guide post 12. By setting the positioning guide post 12 and the guide groove 121, when the grinding blade 13-2 comes into contact with the cutter 100 and is squeezed, the grinding base 13-1 can drive the grinding blade 13-2 to move on the paper presser 3 and play a guiding role.

[0059] See Figure 5 As shown, in one embodiment, the paper presser 3 is also provided with a support frame 30. The support frame 30 can be used to further support the rotating shaft 29 and the linkage 24, or to space the rotating shaft 29 and the linkage 24, or to further support the drive rod 21.

[0060] The scope of protection of this invention is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this invention.

Claims

1. An automatic sharpening device for a paper cutter blade, characterized by comprising a paper presser (3) movably mounted on a base frame (B), a sharpening device for automatically sharpening the cutter (100) by being movably connected to the paper presser (3) and in contact with the cutter (100) of the paper cutter, the sharpening device comprising a sharpening base (13-1) movably connected to the paper presser (3), a sharpening element (13-2) connected to the sharpening base (13-1) and capable of contacting the cutter (100), and an elastic element (14) disposed between the paper presser (3) and the sharpening base (13-1). It also includes a transmission component (9) and a drive mechanism that is driven by the transmission component (9) on the paper presser (3) to drive the grinding base (13-1) to move on the paper presser (3). The drive mechanism includes a transmission arm (25), a rotating shaft (29) driven by the transmission arm (25), a deflection sleeve (28) connected to the rotating shaft (29), and a pulley (23) connected to the grinding base (13-1) and cooperating with the deflection sleeve (28). The transmission component (9) is connected by a component (11) that protrudes from the transmission component (9) to drive the transmission arm (25) to move by means of fixed or detachable means. The deflection sleeve (28) is provided with a circumferential surface (28-1) and a concave circular surface (28-2) that are adapted to the pulley (23).

2. The automatic sharpening device for a paper cutter blade according to claim 1, characterized in that: The transmission arm (25) is also provided with an upper impact plate (26) and a lower impact plate (27). The upper impact plate (26), the lower impact plate (27) and the transmission arm (25) are an integral structure or a separate structure. The transmission arm (25) and the rotating shaft (29) are also provided with a linkage component (24) for the transmission arm (25) to drive the rotating shaft (29) to rotate.

3. The automatic sharpening device for a paper cutter blade according to claim 1, characterized in that: The drive mechanism set on the paper presser (3) and driven by the transmission member (9) to drive the sharpening base (13-1) to move on the paper presser (3) is replaced with a drive mechanism set on the paper presser (3) to drive the sharpening base (13-1) to move on the paper presser (3); the drive mechanism set on the paper presser (3) to drive the sharpening base (13-1) to move on the paper presser (3) includes a drive frame movably connected to the paper presser (3), the drive frame includes a drive rod (21) movably passing through the paper presser (3) and the sharpening base (13-1), a curved plate (20) connected to the drive rod (21), and a drive roller (19) connected to the sharpening base (13-1) and cooperating with the curved plate (20).

4. The automatic sharpening device for a paper cutter blade according to claim 3, characterized in that: The paper press (3) also includes an upper crossbeam (15) and a lower crossbeam (18) connected to both ends of the drive rod (21).

5. An automatic sharpening device for a paper cutter blade according to claim 3, characterized in that: The curved plate (20) is provided with a curved surface (20-1) adapted to the drive roller (19), a flange (20-2) on the upper side of the curved surface (20-1) and a plane (20-3) on the lower side.

6. An automatic sharpening device for a paper cutter blade according to claim 4, characterized in that: It also includes a top plate (16) that is movably mounted on the upper crossbeam (15) and a flexible pad (17) mounted on the top plate (16) or the upper crossbeam (15).

7. An automatic sharpening device for a paper cutter blade according to claim 6, characterized in that: It also includes a selection structure provided on the upper crossbeam (15) and the top plate (16) for selecting whether to perform sharpening. The selection structure includes a deflection groove (138) provided on the upper crossbeam (15) and a guide rod (139) provided on the top plate (16) that is adapted to the deflection groove (138).

8. An automatic blade sharpening device for a paper cutter blade according to claim 1, characterized in that: The number of grinding tools (13-2) mounted on the grinding base (13-1) is one or more.

9. An automatic sharpening device for a paper cutter blade according to claim 1 or 8, characterized in that: It also includes an elastic adjusting element (14-1) installed between the grinding base (13-1) and the grinding tool (13-2).

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