A paper cutting mechanism

Abstract

The present invention relates to a paper cutting mechanism, comprising a work table, a positioning component arranged on the work table, the positioning component comprising a positioning block and a first driving structure, the lower surface of the positioning block is tightly fitted with the upper surface of the work table, the positioning block is connected to the first driving structure, so that the positioning block can be translated in the left and right directions on the work table under the action of the first driving structure; the clamping component comprises a clamping plate and a second driving structure, the clamping plate moves up and down relative to the work table under the action of the second driving structure; the cutting component comprises an upper cutting knife, a lower cutting knife and a third driving structure, the upper cutting knife moves up and down relative to the lower cutting knife under the action of the third driving structure; the paper can be accurately positioned and fixed before cutting, thereby avoiding slippage of the paper during cutting and ensuring that the paper has a high cutting accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of paper cutting equipment, and in particular relates to a paper cutting mechanism. Background Art

[0002] Office paper cutting mechanisms can be divided into intelligent paper cutters and manual paper cutters. Due to the high cost of intelligent paper cutters and the frequent occurrence of driver and sensor failures during use, intelligent paper cutters are rarely used in daily office work. Currently, the most common office paper cutter is still the manual paper cutter. Manual paper cutters are lightweight, easy to operate, and low-cost. They are generally suitable for cutting small amounts of paper. When cutting, one hand is often required to press the paper to be cut on the workbench while the other hand operates the cutter. This often leads to poor cutting accuracy and deformation of the cut paper. This problem is particularly prominent when cutting large amounts of paper at one time, greatly reducing office efficiency. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a paper cutting mechanism to solve the problems of reduced paper cutting accuracy and paper deformation caused by cutting a large amount of paper.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by a paper cutting mechanism of the present invention is:

[0005] A paper cutting mechanism, comprising:

[0006] Work surface: used to support the upper and lower parts on the operating table, and the work surface is set horizontally;

[0007] Positioning assembly: includes a positioning block and a first driving structure;

[0008] Positioning block: Extended in the front-to-back direction, the lower surface of the positioning block is in close contact with the upper surface of the work surface;

[0009] A first driving structure is provided on the work surface, and the positioning block is connected to the first driving structure so that the positioning block can be translated in the left and right directions on the work surface under the action of the first driving structure;

[0010] Compression assembly: includes a compression plate and a second drive structure;

[0011] The second driving structure is arranged on the work surface, and the pressing plate is arranged below the second driving structure;

[0012] The pressing plate is set horizontally compared to the work surface;

[0013] The pressing plate moves up and down relative to the work surface under the action of the second driving structure;

[0014] Cutting assembly: including upper cutting blade, lower cutting blade and third driving structure;

[0015] A third drive structure is provided on the work surface, wherein the upper cutting knife is provided below the third drive structure, and the lower cutting knife is fixed on the work surface. The upper cutting knife and the lower cutting knife are provided correspondingly up and down, and the upper cutting knife moves up and down relative to the lower cutting knife under the action of the third drive structure;

[0016] The work surface is provided with an avoidance groove at the cutting component position.

[0017] Beneficial effects: The paper cutting mechanism of the present invention includes a positioning assembly, which includes a positioning block extending in the front-back direction, the lower surface of the positioning block is tightly fitted with the upper surface of the workbench, and the positioning block can be translated left and right on the workbench under the action of the first driving structure. In this way, one side of the paper to be cut is placed against the side of the positioning block, and the positioning block can position the paper to be cut so that the paper to be cut can be straightened on the workbench; the pressing assembly includes a pressing plate that can move up and down, and the pressing plate moves downward to press the paper to be cut on the workbench to prevent the paper to be cut from slipping before cutting. The cutting assembly includes an upper cutting knife that can move up and down, and the upper cutting knife can cut the paper when it moves downward and aligns with the lower cutting knife. In the present invention, by setting the positioning assembly and the pressing assembly, the paper can be accurately positioned and fixed before cutting, to prevent the paper from slipping during cutting, thereby ensuring that the paper has a high cutting accuracy.

[0018] Furthermore, the first driving structure includes a screw arranged below the work table and rotatable relative to the work table, a fixed bracket adapted to the screw thread, and a guide structure for guiding the fixed bracket; the screw is extended in the left and right directions, and a through slot is provided on one side of the work table that passes through the through slot and extends in the left and right directions. The fixed bracket includes an L-shaped support rod passing through the through slot, and the support rod includes a vertical rod passing through the through slot and extending in the up and down directions and a horizontal rod arranged above the work table and extending in the left and right directions. The horizontal rod is fixed above the vertical rod, and the positioning block is fixedly connected to the end of the horizontal rod away from the vertical rod, and the vertical rod is slidingly matched with the through slot guide.

[0019] Beneficial effects: Through the lead screw and the fixed support rod adapted to the lead screw thread, the rotating lead screw can cause the positioning block to move horizontally on the work table through the fixed support rod, so that the position of the positioning block can adapt to the cutting of papers of different widths; in addition, the guide structure can guide the movement of the fixed bracket. Not only that, the vertical rod of the support rod and the sliding cooperation with the through-slot guide can also guide the movement of the fixed bracket.

[0020] Furthermore, there are two through slots spaced apart in the front-to-back direction, the positioning block is fixedly connected to the two support rods, and the fixed bracket also includes a main rod arranged below the work table and extending along the front-to-back direction. The lower ends of the vertical rods of the two support rods are respectively fixed to the front and rear ends of the main rod, and the main rod is provided with a threaded hole that is adapted to the screw thread.

[0021] Beneficial effect: The positioning block is fixedly connected to the two support rods, and the two support rods are fixed on the main rod. The main rod is provided with a threaded hole adapted to the screw thread, so that when the main rod moves left and right, the two support rods can drive the positioning block to move stably left and right on the work surface.

[0022] The guide structure includes two guide rods fixed on the main rod at a front and rear interval and a linear bearing fixed under the work table. There are two linear bearings. The guide rods extend in the left and right directions, and the linear bearings are respectively adapted to slide with the guide rods.

[0023] Beneficial effect: The setting of the guide structure can guide the left and right movement of the fixed bracket, ensuring the stability of the left and right movement of the fixed bracket, that is, ensuring the stability of the left and right movement of the positioning block.

[0024] Furthermore, the two through slots are located between the two guide rods in the front-to-back direction.

[0025] Beneficial effects: the front guide rod can guide the fixed bracket in front of the front support rod, and the rear guide rod can guide behind the rear support rod, thereby ensuring the stability of the fixed bracket when moving left and right.

[0026] One end of the lead screw is exposed from one side of the work table and is fixed with a rotating handle.

[0027] Beneficial effect: The setting of the rotating handle can facilitate the rotation of the lead screw.

[0028] A fixed seat is fixed on the front side of the work table, and the fixed seat includes a left support frame and a right support frame. Two groups of mounting components are fixed between the left support frame and the right support frame. The two groups of mounting components are arranged at intervals in front and back. The clamping component is installed on the mounting component on the rear side, and the cutting component is installed on the mounting component on the front side.

[0029] Beneficial effect: The setting of the fixing seat can facilitate the installation of the pressing component and the cutting component.

[0030] Furthermore, each set of mounting components includes two optical axes spaced apart in an upper and lower arrangement; a rear guide seat is fixed on the second driving structure, the rear guide seat is slidingly engaged with the two optical axis guides on the rear side, and a locking structure is provided on the rear guide seat for fixing the rear guide seat relative to the optical axis; a front guide seat is fixed on the third driving structure, the front guide seat is slidingly engaged with the two optical axis guides on the front side, and a locking structure is provided on the front guide seat for fixing the front guide seat relative to the optical axis.

[0031] Beneficial effects: The cooperation between the rear guide seat and the two optical axes on the rear side can facilitate the adjustment of the second drive structure in the left and right directions, thereby realizing the position adjustment of the clamping plate in the left and right directions; the cooperation between the front guide seat and the two optical axes on the front side can facilitate the adjustment of the third drive structure in the left and right directions, thereby realizing the position adjustment of the upper cutting knife in the left and right directions.

[0032] Furthermore, the locking structure includes threaded holes respectively opened on the front guide seat and the rear guide seat and studs threadedly adapted to the threaded holes. The threaded holes are opened upward, and the threaded holes are connected to the guide holes in the guide seats. A rotating handle is fixed to the upper end of the studs.

[0033] Beneficial effect: The setting of the locking structure can achieve relative fixation of the guide seat and the optical axis, thereby facilitating position adjustment of the second drive structure and the third drive structure in the left and right directions.

[0034] A first ruler and a second ruler are fixed on the work surface. The first ruler is fixed on the right side of the work surface and extends in the front-to-back direction. The second ruler is fixed on the front side of the work surface and extends in the left-to-right direction. The first ruler is vertically connected to the second ruler.

[0035] Beneficial effects: The setting of the second ruler can mark and measure the moving distances of the positioning block, the upper cutting knife and the pressure plate in the left and right directions respectively; the setting of the first ruler can mark the position of the pressure plate relative to the front and back directions of the paper to be cut before the paper is cut, thereby determining the cutting position of the paper in the front and back directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a paper cutting mechanism of the present invention;

[0037] Figure 2 yes Figure 1 A schematic structural diagram of a cutting assembly (excluding a lower cutter) in a paper cutting mechanism;

[0038] Figure 3 yes Figure 1 A bottom view of a paper cutting mechanism.

[0039] Figure markings: 1-working table; 2-positioning block; 3-cross bar; 4-through slot; 5-second driving structure; 6-optical axis; 7-left support frame; 8-locking structure; 9-front guide seat; 10-pressing plate; 11-right support frame; 12-second scale; 13-first scale; 16-upper cutting knife; 17-third driving structure; 18-cutter fixing seat; 19-linear bearing; 20-guide rod; 21-rotating seat; 22-rotating handle; 23-screw; 26-longitudinal rod; 27-avoidance groove; 28-main rod. DETAILED DESCRIPTION

[0040] The following is a further detailed description of a specific embodiment of a paper cutting mechanism of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0041] like Figure 1-Figure 3 As shown, a paper cutting mechanism of the present invention includes a work surface 1 supported on an operating table with upper and lower intervals. The work surface 1 is arranged horizontally, and legs are fixed at the four corners of the work surface 1 to support the work surface 1 on the operating table. The work surface 1 is provided with a positioning component, a pressing component and a cutting component. The positioning component can position the paper to be cut so that the paper to be cut can be straightened on the work surface 1; the pressing component can press the paper to be cut on the work surface 1 to prevent the paper to be cut from slipping before cutting; the cutting component can cut the paper, and the positioning component and the pressing component can accurately position and fix the paper before cutting, so that the paper can be prevented from slipping during cutting, ensuring that the paper has a high cutting accuracy.

[0042] Specifically, the positioning assembly includes a positioning block 2 and a first drive mechanism. The positioning block 2 extends in the front-to-back direction and has a rectangular cross-section. The lower surface of the positioning block 2 is in close contact with the upper surface of the work surface 1, thereby preventing paper from slipping out between the positioning block 2 and the work surface 1. The first drive mechanism is disposed on the work surface 1, and the positioning block 2 is connected to the first drive mechanism, so that the positioning block 2 is driven by the first drive mechanism to translate horizontally on the work surface 1.

[0043] Specifically, the first driving structure includes a lead screw 23 arranged below the work surface 1 and rotatable relative to the work surface 1, a fixed bracket threadedly adapted to the lead screw 23, and a guide structure for guiding the fixed bracket; the lead screw 23 extends in the left and right directions, and two rotating seats 21 are fixedly provided on the lower surface of the work surface 1. The two rotating seats 21 are spaced apart from each other. The left and right ends of the lead screw 23 are optical axis segments. The two optical axis segments of the lead screw 23 are respectively inserted into the two rotating seats 21 so that the lead screw 23 can be rotatable relative to the rotating seats 21. The left end of the lead screw 23 extends to the left to the left of the left side of the work surface 1, and to facilitate the rotation of the lead screw 23, the left end of the lead screw 23 is exposed from one side of the work surface 1 and is fixed with a rotating handle 22. A through slot 4 is provided on one side of the work surface 1, which runs through the work surface 1 from top to bottom and extends in the left and right directions. The opening of the through slot 4 is arranged to the left. In this embodiment, two through slots 4 are spaced apart from each other.

[0044] The fixed bracket includes a main rod 28 arranged below the work table 1 and extending in the front-to-back direction, and the fixed bracket also includes two L-shaped support rods fixedly connected to the main rod 28. The support rod includes a vertical rod passing through the through slot 4 and extending in the up-down direction and a cross rod 3 arranged above the work table 1 and extending in the left-right direction. The cross rod 3 is fixed above the vertical rod, and the lower end of the vertical rod is vertically fixedly connected to the main rod 28. The end of the two cross rods 3 away from the vertical rod is fixedly provided with a longitudinal rod 26 extending in the front-to-back direction. The positioning block 2 is fixedly connected to the longitudinal rod 26, so that the positioning block 2 is located above the work table 1. A threaded hole is provided on the main rod 28 that is adapted to the thread of the lead screw 23. The vertical rod of the support rod is guided and slidably matched with the through slot 4, so that when the rotating handle 22 is rotated, the lead screw 23 rotates. Under the guiding action of the through slot 4 on the vertical rod of the support rod, the fixed bracket moves in the left-right direction, thereby realizing the left and right translation of the positioning block 2 on the work table 1.

[0045] In order to increase the stability of the translation of the positioning block 2, in this embodiment, a guiding structure is also provided to guide the fixed bracket. The guiding structure includes two guide rods 20 fixed on the main rod 28 at a front and rear interval and a linear bearing 19 fixed under the work table 1. There are two linear bearings 19. The guide rods 20 extend in the left and right directions. The left end of the guide rod 20 is fixed to the main rod 28, and the linear bearings 19 are respectively adapted to guide the sliding of the guide rods 20. In the front-to-back direction, the two through slots 4 are located between the two guide rods 20, so that the guide rod 20 guides the movement of the fixed bracket below the work table 1, and the through slots 4 guide the movement of the support rod of the fixed bracket. In this way, even if the lead screw 23 is set below the work table 1, it can be ensured that the lead screw 23 can drive the fixed bracket to move stably in the left and right directions when it rotates, that is, it is ensured that the positioning block 2 can move smoothly left and right on the work table 1, so that the position of the positioning block 2 can be adjusted according to the width of the paper to be cut. The setting function of the positioning block 2 is to: press one side of the paper to be cut against the side of the positioning block 2, and the positioning block 2 can position the paper to be cut so that the paper to be cut can be straightened on the work table 1.

[0046] In this embodiment, the positioning block 2 is made of Saigang material, which has strong creep resistance, geometric stability and self-lubrication. It can fit tightly with the work surface 1 without causing damage to the work surface 1 due to excessive friction, ensuring that the work surface 1 is smooth and flat, thereby ensuring that the paper remains flat when placed on the work surface 1.

[0047] In order to facilitate the installation of the clamping assembly and the cutting assembly, a fixing seat is fixed on the front side of the work surface, and the fixing seat includes a left support frame 7 and a right support frame 11. The left support frame 7 and the right support frame 11 have the same structure and are both inverted U-shaped frames. The left support frame 7 is fixed to the left front side of the work surface 1, and the right support frame 11 is fixed to the right front side of the work surface 1. Two groups of mounting components are fixed between the left support frame 7 and the right support frame 11, and the two groups of mounting components are spaced apart from each other. In this embodiment, the clamping assembly is installed on the mounting assembly on the rear side, and the cutting assembly is installed on the mounting assembly on the front side.

[0048] Specifically, each mounting assembly includes two optical axes 6 spaced apart vertically. The clamping assembly includes a clamping plate 10 and a second drive structure 5. In this embodiment, the second drive structure 5 is a drive cylinder. The clamping plate 10 is fixed to the lower end of the piston rod of the drive cylinder. The clamping plate 10 is arranged horizontally relative to the work surface 1. When the drive cylinder is in operation, it can drive the clamping plate 10 to move up and down. The drive cylinder drives the clamping plate 10 downward to provide uniform downward pressure, preventing the paper from slipping during the cutting process and ensuring the accuracy of the paper cutting.

[0049] In order to facilitate the position adjustment of the pressure plate 10 according to the specifications of the paper to be cut, in this embodiment, the rear guide seat is fixed on the rear side of the driving cylinder of the second driving structure 5, and a guide hole is provided on the rear guide seat. The optical axis 6 passes through the guide hole and slides with the guide seat. A locking structure 8 is provided on the rear guide seat to fix the rear guide seat relative to the optical axis 6. The locking structure 8 includes a threaded hole provided on the rear guide seat, the threaded hole opening faces upward, and the threaded hole is connected to the guide hole of the rear guide seat. The thread in the threaded hole is adapted to a stud, and a rotating handle is fixed to the upper end of the stud. When the position of the second driving structure 5 needs to be adjusted, the rotating handle is screwed so that the lower end of the stud no longer rests on the optical axis 6, and then the second driving structure 5 is adjusted along the extension direction of the optical axis 6. After adjustment, the rotating handle is screwed again so that the lower end of the stud rests on the optical axis 6, thereby fixing the second driving structure 5 relative to the two optical axes 6 on the rear side.

[0050] The cutting assembly includes an upper cutting knife 16, a lower cutting knife and a third driving structure 17. The third driving structure 17 is arranged on the workbench. Specifically, the third driving structure 17 is a driving cylinder. The upper cutting knife 16 is fixed to the lower end of the piston rod of the driving cylinder of the third driving structure 17 through a cutting knife fixing seat 18. The upper cutting knife 16 can move up and down under the action of the third driving structure 17. The upper cutting knife 16 extends in the left and right directions, and the lower cutting knife is fixed on the fixed table (not shown in the figure). The lower cutting knife extends in the left and right directions, and the length of the lower cutting knife in the left and right directions is longer. In this way, even if the upper cutting knife 16 moves left and right on the workbench 1, it can be ensured that the lower cutting knife corresponds to the upper cutting knife 16 in the up and down directions.

[0051] In order to facilitate the position adjustment of the upper cutting knife 16 according to the specifications of the paper to be cut, in this embodiment, the front guide seat 9 is fixed on the rear side of the driving cylinder of the third driving structure 17, and a guide hole is provided on the front guide seat 9. The front optical axis 6 passes through the guide hole and slides with the guide seat. The front guide seat 9 is provided with a locking structure 8 for fixing the front guide seat 9 relative to the optical axis 6. The locking structure 8 includes a threaded hole provided on the front guide seat 9, the threaded hole opening faces upward, and the threaded hole is connected to the guide hole of the front guide seat 9. The thread in the threaded hole is adapted to a stud, and a rotating handle is fixed to the upper end of the stud. When the position of the third driving structure 17 needs to be adjusted, the rotating handle is screwed so that the lower end of the stud no longer rests on the optical axis 6, and then the third driving structure 17 is adjusted along the extension direction of the optical axis 6. After adjustment, the handle is screwed again so that the lower end of the stud rests on the optical axis 6, thereby fixing the third driving structure 17 relative to the two optical axes 6 on the front side.

[0052] In order to facilitate the upper cutting knife 16 to move downward and contact the lower cutting knife to cut the paper, and at the same time facilitate the cut paper to fall from the work table 1, in this embodiment, the work table 1 is provided with an avoidance groove 27 at the cutting component position. The avoidance groove 27 is opened at the front of the work table 1, and the lower cutting knife is fixed directly below the avoidance groove 27. The upper cutting knife 16 moves downward and contacts the lower cutting knife at the avoidance groove 27 to cut the paper.

[0053] In this embodiment, the blade of the upper cutting knife 16 is made of tungsten steel, which has extremely strong wear resistance and hardness, ensuring stability when cutting a large number of papers at the same time.

[0054] A first scale 13 and a second scale 12 are fixed to the work surface 1. The first scale 13 is fixed to the right side of the work surface 1 and extends in the front-to-back direction. The second scale 12 is fixed to the front side of the work surface 1 and extends in the left-to-right direction. The first scale 13 and the second scale 12 are perpendicularly connected. The second scale 12 is configured to mark and measure the left-to-right movement distances of the positioning block 2, the upper cutting blade 16, and the pressure plate 10. The first scale 13 is configured to mark the position of the pressure plate 10 relative to the paper to be cut in the front-to-back direction before the paper is cut, thereby determining the cutting position of the paper in the front-to-back direction.

[0055] When using the paper cutting mechanism of the present invention, the position of the positioning block 2 is first adjusted according to the width of the paper to be cut in the left-right direction. Specifically, the rotary handle 22 is rotated, and the lead screw 23 rotates. Under the guidance of the vertical rod of the support rod by the through slot 4, and the guidance of the fixed bracket by the guide structure, the fixed bracket moves in the left-right direction, thereby driving the positioning block 2 to translate left and right on the work surface 1 until the positioning block 2 moves to a position that matches the width of the paper to be cut. The left side of the paper to be cut is then placed against the right side of the positioning block 2, and the paper to be cut is positioned and aligned by the positioning block 2 to prevent the paper from slipping sideways. Then the paper to be cut is moved to the position of the pressing plate 10 and the upper cutting knife, and the cutting position of the paper to be cut is positioned using the first scale 13. Then the piston rod of the second driving structure 5 moves downward, causing the pressing plate 10 to press the paper to be cut onto the work surface 1. Then the piston rod of the third driving structure 17 moves downward, driving the upper cutting knife to move downward and contact with the lower cutting knife to achieve cutting of the paper.

[0056] 18. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt and a nut.

[0057] In the above embodiment, there are two through slots spaced apart in the front-to-back direction, the positioning block is fixedly connected to the two support rods, and the fixed bracket also includes a main rod arranged below the work table and extending in the front-to-back direction, and the lower ends of the vertical rods of the two support rods are respectively fixed to the front and rear ends of the main rod, and the main rod is provided with a threaded hole adapted to the screw thread; in other embodiments, one through slot can also be provided in the front-to-back direction, and in this case, a corresponding support rod is also provided. In this case, the main rod can be omitted, and the lower end of the vertical rod of the support rod is provided with a threaded hole adapted to the screw thread.

[0058] In the above embodiment, the two through slots are located between the two guide rods in the front-to-back direction; in other embodiments, the guide rod is located between the two through slots in the front-to-back direction.

[0059] In the above embodiment, one end of the lead screw is exposed from one side of the work surface and is fixed with a rotating handle; in other embodiments, the rotating handle may not be provided.

[0060] In the above embodiment, a fixing seat is fixed on the front side of the work surface, and the fixing seat includes a left support frame and a right support frame. Two groups of mounting components are fixed between the left support frame and the right support frame. The two groups of mounting components are arranged at intervals in front and back. The clamping component is installed on the mounting component on the rear side, and the cutting component is installed on the mounting component on the front side. In other embodiments, the clamping component can be fixed to the work surface by a separate support frame, and the cutting component can be fixed to the work surface by a separate support frame.

[0061] In the above embodiment, a first ruler and a second ruler are fixed on the work surface, the first ruler is fixed to the right side of the work surface and extends in the front-to-back direction, the second ruler is fixed to the front side of the work surface and extends in the left-to-right direction, and the first ruler is vertically connected to the second ruler; in other embodiments, the first ruler and the second ruler may not be set, in which case the position of each component is determined by manual measurement.

Claims

1. A paper cutting mechanism, characterized in that: include: Work surface: used to support the upper and lower parts on the operating table, and the work surface is set horizontally; Positioning assembly: includes a positioning block and a first driving structure; Positioning block: Extended in the front-to-back direction, the lower surface of the positioning block is in close contact with the upper surface of the work surface; A first driving structure is provided on the work surface, and the positioning block is connected to the first driving structure so that the positioning block can be translated in the left and right directions on the work surface under the action of the first driving structure; Compression assembly: includes a compression plate and a second drive structure; The second driving structure is arranged on the work surface, and the pressing plate is arranged below the second driving structure; The pressing plate is set horizontally compared to the work surface; The pressing plate moves up and down relative to the work surface under the action of the second driving structure; Cutting assembly: including upper cutting blade, lower cutting blade and third driving structure; A third drive structure is provided on the work surface, wherein the upper cutting knife is provided below the third drive structure, and the lower cutting knife is fixed on the work surface. The upper cutting knife and the lower cutting knife are provided correspondingly up and down, and the upper cutting knife moves up and down relative to the lower cutting knife under the action of the third drive structure; The work surface is provided with an avoidance groove at the cutting component position; The first driving structure includes a screw arranged below the work table and rotatable relative to the work table, a fixed bracket adapted to the screw thread, and a guide structure for guiding the fixed bracket; the screw is extended in the left and right directions, and a through slot is provided on one side of the work table, which passes through the through slot and extends in the left and right directions, and the fixed bracket includes an L-shaped support rod passing through the through slot, and the support rod includes a vertical rod passing through the through slot and extending in the up and down directions and a cross rod arranged above the work table and extending in the left and right directions, the cross rod is fixed above the vertical rod, the positioning block is fixedly connected to the end of the cross rod away from the vertical rod, and the vertical rod is slidingly matched with the through slot guide; There are two through slots spaced apart in the front-to-back direction, the positioning block is fixedly connected to the two support rods, the fixed bracket also includes a main rod arranged below the work table and extending in the front-to-back direction, the lower ends of the vertical rods of the two support rods are respectively fixed to the front and rear ends of the main rod, and the main rod is provided with a threaded hole adapted to the screw thread.

2. A paper cutting mechanism according to claim 1, characterized in that: The guide structure includes two guide rods fixed on the main rod at a front and rear interval and a linear bearing fixed under the work table. There are two linear bearings. The guide rods extend in the left and right directions, and the linear bearings are respectively adapted to slide with the guide rods.

3. A paper cutting mechanism according to claim 2, characterized in that: The two through slots are located between the two guide rods in the front-to-back direction.

4. A paper cutting mechanism according to any one of claims 1 to 3, characterized in that: One end of the lead screw is exposed from one side of the work table and is fixed with a rotating handle.

5. A paper cutting mechanism according to any one of claims 1 to 3, characterized in that: A fixed seat is fixed on the front side of the work table, and the fixed seat includes a left support frame and a right support frame. Two groups of mounting components are fixed between the left support frame and the right support frame. The two groups of mounting components are arranged at intervals in front and back. The clamping component is installed on the mounting component on the rear side, and the cutting component is installed on the mounting component on the front side.

6. A paper cutting mechanism according to claim 5, characterized in that: Each set of mounting components includes two optical axes spaced apart in an upper and lower arrangement; a rear guide seat is fixed on the second driving structure, the rear guide seat slides with the two optical axis guides on the rear side, and a locking structure is provided on the rear guide seat for fixing the rear guide seat relative to the optical axis; a front guide seat is fixed on the third driving structure, the front guide seat slides with the two optical axis guides on the front side, and a locking structure is provided on the front guide seat for fixing the front guide seat relative to the optical axis.

7. A paper cutting mechanism according to claim 6, characterized in that: The locking structure includes threaded holes respectively opened on the front guide seat and the rear guide seat and studs threadedly adapted to the threaded holes. The threaded holes are opened upward and are connected to the guide holes in the guide seats. A rotating handle is fixed to the upper end of the stud.

8. A paper cutting mechanism according to any one of claims 1 to 3, characterized in that: A first ruler and a second ruler are fixed on the work surface. The first ruler is fixed on the right side of the work surface and extends in the front-to-back direction. The second ruler is fixed on the front side of the work surface and extends in the left-to-right direction. The first ruler is vertically connected to the second ruler.

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