Paper edge cutting device for digital printing machine

Abstract

The invention discloses a paper edge cutting device for a digital printer, and belongs to the technical field of paper edge cutting, the paper edge cutting device for the digital printer comprises an operation table and a shell, a notch is formed in the center of the top surface of the operation table, and a lifting rotating assembly is arranged in the notch; a clamping assembly is installed between the two sides of the inner wall of the shell, a plurality of pushing assemblies are arranged in the center of the rear side of the shell, a pushing and pressing assembly is arranged at the position, aligned with a notch of the operation table, of the top of the shell, and an edge cutting assembly is arranged in the center of the front end of the shell. The stability of paper in the rotating process is ensured through mutual cooperation of the lifting rotating assembly and the pushing and pressing assembly, the problem that the paper inclines or collapses is effectively prevented, the two sides of the rotated paper are aligned and pushed to an edge cutting area through mutual cooperation of the pushing assembly and the clamping assembly, and the paper edge cutting efficiency is improved. Therefore, edge cutting errors caused by paper position deviation or inclination are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of paper trimming, and in particular relates to a paper trimming device for a digital printing machine. Background Art

[0002] In the digital printing industry, with the continuous development and progress of printing technology, the types and specifications of printed products are becoming increasingly diversified, and the requirements for post-printing processing equipment are becoming higher and higher. As an important part of post-printing processing, paper trimming has a direct impact on the overall quality and production efficiency of printed products due to its efficiency and quality. Traditional paper trimming methods are mostly performed manually or semi-automatically, which is not only inefficient, but also difficult to ensure trimming accuracy, while increasing labor costs and operational risks.

[0003] In order to overcome the shortcomings of the above-mentioned traditional trimming methods, traditional trimming equipment on the market often has limitations in functional design. Most of them rely on manual adjustment of the paper direction, which is not only inefficient, but also easily leads to different trimming sizes due to human factors, and the paper cannot be automatically rotated to change the trimming direction. The paper is prone to tilting or collapsing during the trimming process, resulting in uneven trimming, and the two ends of the paper cannot be automatically aligned before and after trimming. These problems not only affect the efficiency and accuracy of trimming, but also increase the difficulty and cost of subsequent processing. Therefore, it is particularly important to develop a digital and intelligent paper trimming device that can automatically complete operations such as paper trimming, rotation, and alignment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a paper trimming device for a digital printing machine.

[0005] The technical solution adopted to solve the above technical problems is: a paper trimming device for a digital printing machine, comprising an operating table and a shell, a notch is opened in the center of the top surface of the operating table, and a lifting and rotating assembly is arranged in the notch, which is used to rotate the paper after trimming is completed to change the trimming direction;

[0006] A clamping assembly is installed between the two sides of the inner wall of the shell, which is used for automatic alignment of the two ends of the paper after rotation;

[0007] A plurality of pushing components are arranged at the rear center portion of the housing for pushing the paper to be trimmed to the trimming area;

[0008] A push assembly is provided at the top of the housing aligned with the notch of the operating table to prevent the paper from tilting or collapsing during the lifting and rotating process;

[0009] A trimming assembly is arranged at the center of the front end of the shell.

[0010] Through the above technical scheme, the lifting and rotating assembly can accurately control the rotation angle and lifting height of the paper, can adjust the lifting speed and stability according to the thickness of the paper and the trimming requirements, and reduce the vibration of the paper during the lifting process. The clamping assembly can achieve tight and uniform clamping of paper of all sizes to prevent the paper from slipping or deforming during the rotation process, resulting in uneven paper and uneven trimming. The pushing cylinder in the pushing assembly can smoothly push the paper to the trimming area in a short time. The material and structural design of the pushing plate take into account the flexibility of the paper to ensure that the paper is not damaged during the pushing process. When the top cylinder in the pushing assembly works with the pushing plate, it is ensured that the paper does not tilt during the lifting and rotating process to adapt to papers of different thicknesses. At the same time, the surface is covered with soft materials to reduce the pressure concentration points on the surface of the paper. The gate knife in the trimming assembly is made of high hardness and high wear resistance materials to ensure that the blade is sharp and the cutting is smooth during the trimming process. The movement trajectory of the gate knife is controlled by a precise guide rail and slider system to ensure that the trimming straightness and parallelism meet high standards.

[0011] Furthermore, the lifting and rotating assembly includes a lifting cylinder fixedly installed at the center of the bottom plate of the operating table, a lifting plate is fixedly installed on the top end of the piston rod of the lifting cylinder, and a motor is installed on the top of the lifting plate.

[0012] Through the above technical solution, the output shaft of the motor is directly connected to the turntable through a high-strength coupling to ensure the efficiency and stability of power transmission. The turntable is made of lightweight and high-strength material to reduce the inertia force during rotation. At the same time, the surface is specially treated to increase the friction between the paper and the paper to prevent the paper from slipping during rotation. The lifting cylinder is one of the key components of the lifting and rotating assembly. Its precise control is crucial for the smooth lifting and lowering of the paper. During the lifting process, the cylinder can maintain a stable lifting speed and pressure output to ensure that the paper will not be subjected to excessive impact or vibration during the lifting process. The lifting plate is a component that carries the motor and the turntable, and its structural design has also been carefully optimized. The lifting plate is made of sturdy and durable materials and is precisely processed to ensure its flatness and strength. There are also multiple guide devices and limit devices on the lifting plate to ensure that a stable motion trajectory and accurate stop position can be maintained during the lifting process.

[0013] Furthermore, an output shaft is arranged on the top of the motor, a turntable is fixedly mounted on the top of the output shaft, and the turntable is arranged in the slot.

[0014] Through the above technical solution, the motor is a key component for driving the turntable to rotate. The optimization of its drive and control system is crucial to improving the efficiency and stability of the entire trimming device. The surface of the turntable is made of special materials and processed with processes, such as rubber coating or anti-slip texture, to increase the friction between the paper and prevent the paper from slipping or shifting during rotation.

[0015] Furthermore, a plurality of limit rods are fixedly connected to the peripheral side of the top of the lifting cylinder, and the plurality of limit rods all penetrate the lifting plate.

[0016] Through the above technical solution, the limit rods are used as the connecting parts between the lifting plate and the lifting cylinder, and their number and distribution are carefully designed to ensure that the lifting plate can maintain horizontal and stable movement during the lifting process. This design effectively prevents the lifting plate from tilting or shaking during the lifting process, thereby ensuring the smooth rotation of the transferred paper. The limit rods not only play a supporting and stabilizing role, but also limit the movement range and position of the lifting plate by penetrating with the lifting plate. This enables the lifting cylinder to more accurately control its lifting height and position when driving the lifting plate, avoiding errors and failures caused by excessive lifting or position offset.

[0017] Furthermore, the clamping assembly includes a first cylinder fixedly mounted on one side of the outer wall of the housing, and a first clamping plate is movably connected to the front end of a piston rod of the first cylinder.

[0018] Through the above technical solution, the first cylinder is used as the power source of the clamping assembly. The cylinder is fixedly installed on one side of the outer wall of the shell, and the position is precisely calculated to ensure that no unnecessary interference or damage is caused to the paper during clamping. The first clamping plate is a component that directly contacts the paper. Its design needs to consider the fit with the paper, friction, and factors to prevent paper damage. An active connection mechanism, such as a hinge or sliding connection, is used between the front end of the piston rod and the first clamping plate to allow the clamping plate to be adjusted within a certain range during the clamping process to better adapt to papers of different sizes and shapes. This design not only improves the flexibility of clamping, but also ensures the uniform distribution of the clamping force, thereby improving the trimming accuracy.

[0019] Furthermore, the clamping assembly also includes a second cylinder fixedly mounted on the other side of the outer wall of the shell, and a second clamping plate is movably connected to the front end of the piston rod of the second cylinder.

[0020] Through the above technical solution, a second cylinder and its corresponding second clamping plate are added to the original clamping assembly. Through the simultaneous action of the two cylinders, the clamping force can be applied to both sides of the paper in a more balanced manner. This balanced clamping force helps to reduce the distortion or deformation of the paper during the trimming process and improve the trimming accuracy. Especially when processing thinner or easily deformed paper, the advantage of the clamping assembly 4 is particularly obvious. The distance between the two clamping plates can be freely adjusted according to the width of the paper. When it is necessary to process papers of different sizes, it is only necessary to adjust the extension length of the piston rods of the two cylinders through the control system to achieve flexible changes in the clamping range.

[0021] Furthermore, the pushing assembly includes two pushing cylinders fixedly mounted on the rear end of the shell, the front ends of the two pushing cylinder piston rods are fixedly connected to pushing blocks, and the front ends of the two pushing blocks are commonly fixedly connected to a pushing plate.

[0022] Through the above technical scheme, the pushing component is an important part of the paper trimming device for a digital printing machine. It is mainly responsible for pushing the cut paper from the cutting area to the next process or collection area. The design of the pushing component realizes a stable and precise paper pushing function. The pushing component uses two pushing cylinders as power sources, which are fixedly installed on both sides of the rear end of the shell. The pushing block fixedly connected to the front end of the piston rod will move forward synchronously to ensure that the pushing plate remains horizontal and stable during the pushing process. The pushing plate fixedly connected to the front end of the pushing block is the component that actually contacts the paper. The design of the pushing plate needs to consider the contact area with the paper, the friction coefficient and the factors to avoid damage to the paper. Usually, the pushing plate will be made of a smooth material with a certain hardness to ensure that the paper can slide smoothly without scratches or wear during the pushing process. In addition, the size and shape of the pushing plate will also be customized according to the size of the paper and the cutting requirements to ensure the accuracy and efficiency of the pushing.

[0023] Furthermore, the pushing assembly includes a top cylinder arranged at a position where the top of the shell is aligned with the notch of the operating table, and the pushing plate works in coordination with the lifting and rotating assembly.

[0024] Through the above technical solution, the core component of the pushing assembly is the top cylinder, which is carefully arranged on the top of the shell and precisely aligned with the slot of the operating table. This design ensures that the top cylinder can directly act on the paper to be cut when working, and achieves precise positioning and pressure to ensure that stable and sufficient pressure can be provided during the pushing process, while avoiding unnecessary damage to the paper. The pushing plate is the front end connecting component of the piston rod of the top cylinder, and its design needs to match the working characteristics of the lifting and rotating assembly. During the cutting process, when the lifting and rotating assembly is started, the pushing assembly is started immediately, and they are started together to lift the paper to the predetermined position and rotate it to the cutting angle. This synergistic effect not only helps to fix the position of the paper, but also prevents it from tilting or collapsing during the lifting and rotating process.

[0025] Furthermore, the trimming assembly comprises a trimming cylinder fixedly mounted on the front end of the top of the housing, and a gate knife is fixedly mounted on the bottom end of the piston rod of the trimming cylinder for trimming the paper.

[0026] Through the above technical solution, the trimming cylinder, as the power source of the trimming assembly, is fixedly installed at the top front end of the shell. The position is accurately calculated to ensure the accuracy of the cutting path. The gate knife is the actuator at the bottom end of the piston rod of the trimming cylinder. Its quality and performance directly affect the cutting effect. The gate knife needs to be made of high hardness and high wear resistance materials, such as high-speed steel or cemented carbide, to ensure the flatness and smoothness of the cutting edge.

[0027] Furthermore, a waste collection box is provided on one side of the front end of the outer surface of the operating table for collecting waste generated during the trimming process.

[0028] Through the above technical solution, the waste collection box is cleverly set on one side of the front end of the outer surface of the operating table. The selection of this position fully considers the convenience of the operator. During the trimming process, waste materials often fall naturally as the cutting action is completed. The setting of the waste collection box can ensure that these waste materials are collected in a timely and effective manner, avoiding the difficulty of cleaning and environmental pollution caused by waste materials scattered all over the ground.

[0029] The beneficial effects of the present invention are as follows: (1) The present invention ensures the stability of the paper during the rotation process by cooperating with the lifting and rotating component and the pushing component, effectively preventing the problem of paper tilting or collapsing, and further improving the accuracy and reliability of trimming, so that the paper can be automatically rotated to change the trimming direction after trimming is completed, without the need for manual repositioning or adjustment of the paper, thereby greatly simplifying the trimming process; (2) The present invention aligns the two sides of the rotated paper and pushes it to the trimming area by cooperating with the pushing component and the clamping component. After the paper is aligned, the trimming operation can be performed based on a unified reference line or reference plane, thereby reducing the trimming error caused by paper position offset or tilt. The use of the pushing component and the clamping component eliminates the need for manual adjustment and confirmation of the paper position, reduces dependence on operators, and thus improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a first perspective structural diagram of the present invention;

[0031] Figure 2 It is a second viewing angle structural diagram of the present invention;

[0032] Figure 3 It is a schematic diagram of the top structure of the present invention;

[0033] Figure 4 It is a schematic diagram of the internal cross-sectional structure of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the lifting and rotating assembly of the present invention;

[0035] Figure 6It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0036] Figure 7 It is a plan view of the pushing component of the present invention.

[0037] Figure numerals: 1. operating table; 101. waste collection box; 2. shell; 3. pushing assembly; 301. pushing cylinder; 302. pushing block; 303. pushing plate; 4. clamping assembly; 401. first cylinder; 402. first clamping plate; 403. second cylinder; 404. second clamping plate; 5. lifting and rotating assembly; 501. lifting cylinder; 502. lifting plate; 503. motor; 504. output shaft; 505. limiting rod; 506. turntable; 6. trimming assembly; 601. trimming cylinder; 602. gate knife; 7. pushing assembly; 701. top cylinder; 702. pushing plate. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] like Figure 1-Figure 7 As shown, a paper trimming device for a digital printing machine of the present embodiment includes an operating table 1 and a shell 2. A waste collection box 101 is provided on one side of the front end of the outer surface of the operating table 1 for collecting waste generated during the trimming process. The waste collection box 101 is cleverly arranged on one side of the front end of the outer surface of the operating table 1. The selection of this position fully considers the convenience of the operator. During the trimming process, waste often falls naturally as the cutting action is completed. The setting of the waste collection box 101 can ensure that the waste is collected in a timely and effective manner, thereby avoiding the difficulty in cleaning and environmental pollution caused by the waste scattered all over the ground.

[0040] like Figure 5As shown, a notch is provided in the center of the top surface of the operating table 1, and a lifting and rotating assembly 5 is arranged in the notch, which is used to rotate the paper to change the trimming direction after the trimming is completed; the lifting and rotating assembly 5 includes a lifting cylinder 501 fixedly installed at the center of the bottom plate of the operating table 1, a lifting plate 502 is fixedly installed on the top of the piston rod of the lifting cylinder 501, a motor 503 is installed on the top of the lifting plate 502, an output shaft 504 is arranged on the top of the motor 503, a turntable 506 is fixedly installed on the top of the output shaft 504, and the turntable 506 is arranged in the notch, and a plurality of limit rods 505 are fixedly connected to the peripheral side of the top of the lifting cylinder 501, and the plurality of limit rods 505 all penetrate the lifting plate 502. The lifting cylinder 501, as the core power component of the assembly, is stably fixed at the center of the bottom plate of the operating table 1 and is movable The extension and retraction of the plug rod drives the lifting plate 502 to achieve smooth lifting movement in the vertical direction, ensuring the stability and accuracy of the lifting process. The lifting plate 502 is a key component connecting the lifting cylinder 501 and the rotating assembly. The motor 503 installed on the top provides a power source for the rotation function. The top output shaft 504 of the motor 503 is tightly connected to the turntable 506, ensuring efficient transmission of power. In order to further improve the safety and stability of the lifting and rotating assembly 5, a plurality of limit rods 505 are fixedly connected to the top peripheral side of the lifting cylinder 501. These limit rods 505 not only play a guiding role, ensuring the linear motion of the lifting plate 502 during the lifting process, but also effectively prevent the lifting plate 502 from being offset or tilted during the lifting process through the design of running through the lifting plate 502.

[0041] like Figure 4-Figure 7As shown, a clamping assembly 4 is installed between the two sides of the inner wall of the shell 2, which is used for automatic alignment of the two ends of the paper after rotation; the clamping assembly 4 includes a first cylinder 401 fixedly installed on one side of the outer wall of the shell 2, and the front end of the piston rod of the first cylinder 401 is movably connected to a first clamping plate 402, and the clamping assembly 4 also includes a second cylinder 403 fixedly installed on the other side of the outer wall of the shell 2, and the front end of the piston rod of the second cylinder 403 is movably connected to a second clamping plate 404. The first cylinder 401 serves as a power source for the clamping assembly 4. The first cylinder 401 is fixedly installed on one side of the outer wall of the shell 2, and its position is accurately calculated to ensure that no unnecessary interference or damage is caused to the paper during clamping. The first clamping plate 402 is a component that directly contacts the paper, and its design needs to consider the fit with the paper, friction, and factors to prevent paper damage. A movable connection mechanism is adopted between the front end of the piston rod and the first clamping plate 402. For example, a hinged or sliding connection is used to allow the first clamping plate 402 to be adjusted within a certain range during the clamping process to better adapt to papers of different sizes and shapes. This design not only improves the flexibility of clamping, but also ensures the uniform distribution of clamping force, thereby improving the trimming accuracy. A second cylinder 403 and its corresponding second clamping plate 404 are added to the original clamping component 4. Through the simultaneous action of the two cylinders, the clamping force can be applied to both sides of the paper in a more balanced manner. This balanced clamping force helps to reduce the distortion or deformation of the paper during the trimming process and improve the trimming accuracy. Especially when processing thinner or easily deformed paper, the advantage of the clamping component 4 is particularly obvious. The distance between the two clamping plates can be freely adjusted according to the width of the paper. When it is necessary to process papers of different sizes, the flexible change of the clamping range can be achieved by simply adjusting the extension length of the piston rods of the two cylinders through the control system.

[0042] like Figure 6-Figure 7As shown, a plurality of pushing components 3 are arranged at the center part of the rear side of the shell 2, which are used to push the paper to be trimmed to the trimming area; the pushing component 3 includes two pushing cylinders 301 fixedly installed at the rear end of the shell 2, and the front ends of the piston rods of the two pushing cylinders 301 are fixedly connected to the pushing blocks 302, and the front ends of the two pushing blocks 302 are commonly fixedly connected to the pushing plates 303. The pushing component 3 is an important part of the paper trimming device for the digital printing machine, and it is mainly responsible for pushing the cut paper from the cutting area to the next process or collection area. The design of the pushing component 3 realizes a stable and accurate paper pushing function. The pushing component 3 uses two pushing cylinders 301 as power sources, which are fixedly installed at the outer On both sides of the rear end of the shell 2, the push blocks 302 fixedly connected to the front end of the piston rod will move forward synchronously to ensure that the push plate 303 remains horizontal and stable during the pushing process. The push plate 303 fixedly connected to the front end of the push block 302 is the component that actually contacts the paper. The design of the push plate 303 needs to consider the contact area with the paper, the friction coefficient and the factors to avoid damage to the paper. Usually, the push plate 303 is made of a smooth material with a certain hardness to ensure that the paper can slide smoothly without scratches or wear during the pushing process. In addition, the size and shape of the push plate 303 will also be customized according to the size and cutting requirements of the paper to ensure the accuracy and efficiency of the pushing.

[0043] like Figure 3-Figure 5 As shown, a pushing assembly 7 is provided at the position where the top of the shell 2 is aligned with the notch of the operating table 1, which is used to prevent the paper from tilting or collapsing during the lifting and rotating process; the pushing assembly 7 includes a top cylinder 701 arranged at the position where the top of the shell 2 is aligned with the notch of the operating table 1, and a pushing plate 702 works in coordination with the lifting and rotating assembly 5. The core component of the pushing assembly 7 is the top cylinder 701, which is carefully arranged at the top of the shell 2 and its position is precisely aligned with the notch of the operating table 1. This design ensures that the top cylinder 701 can directly act on the top of the paper to be cut during operation, achieves precise positioning and pressure, so as to ensure that stable and sufficient pressure can be provided during the pushing process, while avoiding unnecessary damage to the paper. The pushing plate 702 is a front end connecting component of the piston rod of the top cylinder 701, and its design needs to match the working characteristics of the lifting and rotating assembly 5. During the cutting process, when the lifting and rotating assembly 5 is started, the pushing assembly 7 is immediately started, and they are started together to lift the paper to a predetermined position and rotate it to a cutting angle. This synergy not only helps to fix the position of the paper, but also prevents it from tilting or collapsing during the lifting and rotating process.

[0044] like Figure 4-Figure 7As shown, a trimming assembly 6 is provided at the center of the front end of the housing 2; the trimming assembly 6 includes a trimming cylinder 601 fixedly mounted on the top front end of the housing 2, and a gate knife 602 is fixedly mounted on the bottom end of the piston rod of the trimming cylinder 601 for trimming the paper. The trimming cylinder 601 of the trimming assembly 6 is firmly mounted on the top front end of the housing 2 to ensure that the gate knife 602 can accurately contact and cut the edge of the paper when in action. The piston rod of the trimming cylinder 601 can also be designed with a buffer mechanism to effectively reduce the impact of the gate knife 602 when it falls, thereby protecting the integrity of the paper and the equipment. When the paper is positioned and stabilized, the trimming cylinder 601 of the trimming assembly 6 is started to drive the gate knife 602 to press down quickly to perform precise trimming of the paper. After the trimming is completed, the gate knife 602 automatically resets and waits for the next trimming operation.

[0045] The working principle of this embodiment is as follows: when the paper to be trimmed is placed in the specified position, the pushing cylinder 301 of the pushing component 3 starts to work, and the pushing block 302 is pushed to move by extending the piston rod. The pushing block 302 is connected to the pushing plate 303 and will move forward to push the paper smoothly to the trimming area. The trimming cylinder 601 of the trimming component 6 is started to drive the gate knife 602 to press down quickly to perform precise trimming on the paper. After the trimming is completed, the trimming component 6 returns to its original position, and then the lifting cylinder 501 of the lifting and rotating component 5 starts to work, pushing the lifting plate 502 to rise, and the motor 503 and the turntable 506 on the lifting plate 502 will also rise accordingly. After the turntable 506 and the paper are raised to a suitable height, the motor 503 is started and the turntable 506 is driven to rotate through the output shaft 504. During this process, the top cylinder 701 of the pushing component 7 descends, and the pushing plate 702 is close to the top of the paper, providing The additional pushing force prevents the paper from tilting or collapsing during the rotation process, thereby driving the paper to rotate to the next trimming direction. After the trimming is completed, the pushing component 7 returns to the initial position and waits for the next lifting and rotating component 5 to start. Then the first cylinder 401 and the second cylinder 403 of the clamping component 4 are started at the same time, and the first clamping plate 402 and the second clamping plate 404 are pushed toward each other through the extension of the piston rod until the clamping plate lightly touches the paper, thereby realizing automatic alignment and fixation of the paper. After the alignment is completed, the trimming cylinder 601 of the trimming component 6 is started again, driving the gate knife 602 to press down quickly, and the paper is precisely trimmed. After the trimming is completed, the gate knife 602 automatically resets, and the above operation is repeated until all four sides of the paper are trimmed. Finally, the paper is pushed out smoothly with the pushing plate 303. The waste generated during the trimming process needs to be manually placed in the waste collection box 101 at the front end of the operating table 1 for subsequent cleaning and processing.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A paper trimming device for a digital printing press, comprising an operating table (1) and a housing (2), characterized in that: A notch is provided at the center of the top surface of the operating table (1), and a lifting and rotating assembly (5) is arranged in the notch, which is used to rotate the paper to change the cutting direction after the trimming is completed; A clamping assembly (4) is installed between the two sides of the inner wall of the shell (2) to automatically align the two ends of the paper after rotation; A plurality of pushing components (3) are arranged at the rear center portion of the housing (2) for pushing the paper to be trimmed to the trimming area; A pushing assembly (7) is provided at the top of the housing (2) aligned with the notch of the operating table (1), for preventing the paper from tilting or collapsing during the lifting and rotating process; A trimming assembly (6) is provided at the front center of the housing (2).

2. The paper trimming device for a digital printing press according to claim 1, characterized in that: The lifting and rotating assembly (5) comprises a lifting cylinder (501) fixedly mounted at the center of the bottom plate of the operating platform (1), a lifting plate (502) fixedly mounted on the top end of the piston rod of the lifting cylinder (501), and a motor (503) mounted on the top of the lifting plate (502).

3. The paper trimming device for a digital printing machine according to claim 2, characterized in that: An output shaft (504) is arranged at the top of the motor (503), a rotating disk (506) is fixedly mounted on the top of the output shaft (504), and the rotating disk (506) is arranged in the slot.

4. The paper trimming device for a printing press according to claim 3, characterized in that: A plurality of limiting rods (505) are also fixedly connected to the peripheral side of the top of the lifting cylinder (501), and the plurality of limiting rods (505) all penetrate the lifting plate (502).

5. The paper trimming device for a digital printing press according to claim 1, characterized in that: The clamping assembly (4) comprises a first cylinder (401) fixedly mounted on one side of the outer wall of the housing (2), and a first clamping plate (402) is movably connected to the front end of the piston rod of the first cylinder (401).

6. The paper trimming device for a digital printing machine according to claim 5, characterized in that: The clamping assembly (4) further comprises a second cylinder (403) fixedly mounted on the other side of the outer wall of the housing (2), and a second clamping plate (404) is movably connected to the front end of the piston rod of the second cylinder (403).

7. The paper trimming device for a digital printing press according to claim 1, characterized in that: The pushing assembly (3) comprises two pushing cylinders (301) fixedly mounted on the rear end of the housing (2), the front ends of the piston rods of the two pushing cylinders (301) are fixedly connected to pushing blocks (302), and the front ends of the two pushing blocks (302) are commonly fixedly connected to a pushing plate (303).

8. The paper trimming device for a digital printing press according to claim 1, characterized in that: The pushing assembly (7) comprises a top cylinder (701) arranged at the top of the housing (2) aligned with the notch of the operating table (1), and the pushing plate (702) cooperates with the lifting and rotating assembly (5).

9. The paper trimming device for a digital printing press according to claim 1, characterized in that: The trimming assembly (6) comprises a trimming cylinder (601) fixedly mounted on the front end of the top of the housing (2), and a knife (602) is fixedly mounted on the bottom end of the piston rod of the trimming cylinder (601) for trimming the edges of paper.

10. The paper trimming device for a digital printing press according to claim 1, characterized in that: A waste collection box (101) is provided on one side of the front end of the outer surface of the operating table (1) for collecting waste generated during the trimming process.

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