A fixed-length compensation device for inner cardboard

Abstract

The utility model discloses a kind of inner card paper fixed-length compensation equipment, it is related to mechanical equipment technical field.The equipment includes conveying guide rail, visual mechanism and paper feeding mechanism, conveying guide rail, visual mechanism and paper feeding mechanism are all arranged on rack;Conveying guide rail is used to cooperate with paper feeding mechanism, inner card paper is conveyed;Visual mechanism is located at the top of conveying guide rail, and aligns conveying guide rail, and visual mechanism is used to detect the conveying error of inner card paper on conveying guide rail;Paper feeding mechanism is located in the conveying direction of inner card paper, and paper feeding mechanism is connected with visual mechanism communication;Paper feeding mechanism is used to adjust the conveying speed of inner card paper on conveying guide rail according to conveying error.The utility model can correct the conveying error of inner card paper in conveying process, improve the accuracy and reliability of conveying equipment when conveying inner card paper, avoid cutting quality problem caused by conveying error, ensure the appearance quality of packaging.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to an internal paper length compensation device. Background Technology

[0002] With the deepening of tobacco industry reforms, cigarette manufacturers are increasingly demanding higher standards for inner cardboard development. Inner cardboard has evolved from single-color to multi-color designs, especially in high-end cigarettes, where colored patterned inner cardboard is becoming widely used and is one of the important directions in Chinese cigarette research.

[0003] Existing cutting equipment for inner cardboard uses mechanical phase positioning. During actual production, the tension on the inner cardboard is not perfectly uniform, and factors such as machine vibration cause frequent changes in the inner cardboard's feed speed. This results in the color mark on the inner cardboard lagging or leading, causing errors in the cutting position. Furthermore, existing cutting equipment lacks a correction function, and the cumulative error increases with each run, eventually leading to the inner cardboard cut onto the pattern, affecting the accuracy and quality of the inner cardboard cutting, and ultimately impacting the packaging's appearance.

[0004] In the process of realizing this utility model, the inventors discovered that the prior art has at least the following problems:

[0005] Existing inner cardboard cutting equipment lacks a correction function, which affects the accuracy and cutting quality of the inner cardboard, ultimately impacting the appearance quality of the packaging. Utility Model Content

[0006] The purpose of this utility model is to provide an inner cardboard length compensation device to solve the technical problem that existing inner cardboard cutting devices lack a correction function, which affects the accuracy and cutting quality of the inner cardboard and ultimately the appearance quality of the packaging. The various technical effects of the preferred technical solutions provided by this utility model are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This utility model provides an internal paper length compensation device, comprising: a conveying guide rail, a vision mechanism, and a paper feeding mechanism, wherein the conveying guide rail, the vision mechanism, and the paper feeding mechanism are all mounted on a frame;

[0009] The conveying guide rail is used to cooperate with the paper feeding mechanism to convey the inner cardboard.

[0010] The vision mechanism is located on top of the conveying guide rail and aligned with the conveying guide rail. The vision mechanism is used to detect the conveying error of the inner card on the conveying guide rail.

[0011] The paper feeding mechanism is located in the conveying direction of the inner cardboard and is communicatively connected to the vision mechanism; the paper feeding mechanism is used to adjust the conveying speed of the inner cardboard on the conveying guide rail according to the conveying error.

[0012] Optionally, the vision mechanism includes a vision camera and a control processing module. The control processing module is connected to the vision camera and the paper feeding mechanism respectively. The control processing module is used to detect the feeding error of the inner paper jam in the image captured by the vision camera and convert the feeding error into an electrical signal to adjust the feeding speed of the paper feeding mechanism.

[0013] Optionally, the paper feeding mechanism includes a paper feeding roller and a paper feeding servo motor, wherein the paper feeding roller is connected to the paper feeding servo motor and is driven by the paper feeding servo motor.

[0014] Optionally, the paper feeding roller includes a first paper feeding roller and a second paper feeding roller, the first paper feeding roller and the second paper feeding roller are respectively located on the upper and lower sides of the conveying guide rail, the first paper feeding roller is connected to the paper feeding servo motor through a first coupling and a first connecting flange, and the second paper feeding roller is connected to the first paper feeding roller through a first transmission component.

[0015] Optionally, the conveying device further includes a paper pressing mechanism, which is mounted on the frame and located in the conveying direction of the inner cardboard; the paper pressing mechanism is communicatively connected to the vision mechanism, and is used to adjust the pressing speed of the inner cardboard on the conveying guide rail according to the conveying error.

[0016] Optionally, the paper pressing mechanism includes a paper pressing roller and a paper pressing servo motor, wherein the paper pressing roller is connected to the paper pressing servo motor and is driven by the paper pressing servo motor.

[0017] Optionally, the paper pressing roller includes a first paper pressing roller and a second paper pressing roller, the first paper pressing roller and the second paper pressing roller are respectively located on the upper and lower sides of the conveying guide rail, the first paper pressing roller is connected to the paper pressing servo motor through a second coupling and a second connecting flange, and the second paper pressing roller is connected to the first paper pressing roller through a second transmission component.

[0018] Optionally, pressure teeth are provided on the circumference of the second pressure roller.

[0019] Optionally, the frame includes a first support frame, a second support frame, and a third support frame, both of which are connected to the first support frame; the conveying guide rail is connected to the first support frame; the paper feeding mechanism is connected to the first and second support frames respectively and is supported by the first and second support frames; the paper pressing mechanism is connected to the first and second support frames respectively and is supported by the first and second support frames; and the vision mechanism is supported by the third support frame.

[0020] Optionally, the first support frame includes a support plate, and the conveying guide rail is mounted on the first support frame via the support plate.

[0021] Implementing one of the above-described technical solutions of this utility model has the following advantages or beneficial effects:

[0022] This utility model includes a conveyor rail, a vision mechanism, and a paper feeding mechanism. The conveyor rail and the paper feeding mechanism work together to ensure the stability and accuracy of the inner cardboard during the conveying process. The vision mechanism is aligned with the conveyor rail to detect conveying errors of the inner cardboard. It can monitor the specific position of the pattern on the inner cardboard in real time, confirming whether the pattern is ahead or behind, and can quickly and accurately detect conveying errors. The paper feeding mechanism, based on the information fed back by the vision mechanism, adjusts the motor speed and direction to achieve precise control of the inner cardboard conveying speed, thereby correcting conveying errors and ensuring accurate positioning of the inner cardboard before cutting. This improves the accuracy and reliability of the conveying equipment when conveying inner cardboard, avoids cutting quality problems caused by conveying errors, ensures the appearance quality of the packaging, and reduces the workload of operators. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0024] Figure 1 This is a first-view schematic diagram of the overall structure of an embodiment of the present utility model;

[0025] Figure 2 This is a second-view schematic diagram of the overall structure of an embodiment of this utility model;

[0026] In the diagram: 1. Conveyor rail; 2. Vision mechanism; 21. Vision camera; 3. Paper feeding mechanism; 31. Paper feeding roller; 311. First paper feeding roller; 312. Second paper feeding roller; 32. Paper feeding servo motor; 33. First coupling; 34. First connecting flange; 4. Paper pressing mechanism; 41. Second paper pressing roller; 42. Pressing teeth; 43. Paper pressing servo motor; 44. Second coupling; 45. Second connecting flange; 5. Frame; 51. First support frame; 511. Support plate; 52. Second support frame; 53. Third support frame; 6. Inner paper clamp. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, various exemplary embodiments described below will be referenced to the accompanying drawings, which form part of the exemplary embodiments, illustrating various exemplary embodiments that may be adopted to implement this utility model. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. It should be understood that they are merely examples of processes, methods, and apparatuses consistent with some aspects of this utility model disclosed as detailed in the appended claims, and other embodiments may be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and spirit of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "multiple" means two or more. The terms "connected" and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, communication connections, direct connections, indirect connections through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] To illustrate the technical solution described in this utility model, specific embodiments are described below, showing only the parts related to the embodiments of this utility model.

[0030] Example:

[0031] like Figure 1-2 As shown, this utility model provides an inner cardboard length compensation device, including: a conveying guide rail 1, a vision mechanism 2, and a paper feeding mechanism 3, all of which are mounted on a frame 5; the conveying guide rail 1 cooperates with the paper feeding mechanism 3 to convey the inner cardboard 6; the vision mechanism 2 is located at the top of the conveying guide rail 1 and aligned with it, and is used to detect the conveying error of the inner cardboard 6 on the conveying guide rail 1; the paper feeding mechanism 3 is located in the conveying direction of the inner cardboard 6 and is communicatively connected to the vision mechanism 2; the paper feeding mechanism 3 is used to adjust the conveying speed of the inner cardboard 6 on the conveying guide rail 1 according to the conveying error.

[0032] The conveyor rail 1 and the paper feeding mechanism 3 work together to ensure the stability and accuracy of the inner cardboard 6 during transport. The vision mechanism 2 is aligned with the conveyor rail 1 to detect transport errors of the inner cardboard 6. It can monitor the specific position of the pattern on the inner cardboard 6 in real time, confirming whether the pattern is ahead or behind, and quickly and accurately detect transport errors. The paper feeding mechanism 3, based on the feedback from the vision mechanism 2, adjusts the motor speed and direction to precisely control the transport speed of the inner cardboard 6, thereby correcting transport errors and ensuring accurate positioning of the inner cardboard 6 before cutting. This improves the accuracy and reliability of the conveying equipment when transporting the inner cardboard 6, avoids cutting quality problems caused by transport errors, ensures the appearance quality of the packaging, and reduces the workload of operators.

[0033] Below, we will combine Figure 1-2 The internal paper length compensation device described in this embodiment will be described in detail.

[0034] The vision mechanism 2 includes a vision camera 21 and a control processing module. The control processing module is connected to the vision camera 21 and the paper feeding mechanism 3 respectively. The control processing module is used to detect the feeding error of the inner paper jam 6 from the image captured by the vision camera 21 and convert the feeding error into an electrical signal to adjust the feeding speed of the paper feeding mechanism 3.

[0035] Specifically, the vision mechanism 2 includes a vision camera 21 and a control processing module. Among them, such as... Figure 2As shown, the vision camera 21 is located on the frame 5 and aligned with the conveyor rail to acquire images of the inner cardboard 6 being conveyed on the conveyor rail, and to determine the location of the pattern on the inner cardboard 6. After acquiring the image of the inner cardboard 6, the control processing module processes the image. The processing can involve comparing the image with a previously calibrated image to confirm whether the position of the inner cardboard 6 is ahead or behind. The control processing module is connected to the paper feeding mechanism 3. If the inner cardboard 6 being conveyed on the conveyor rail 1 is ahead or behind, the control processing module calculates the actual conveying error and outputs a corresponding electrical signal to the paper feeding mechanism 3 to control the drive speed of the paper feeding servo motor 32 in the paper feeding mechanism 3. This eliminates the conveying error, corrects the conveying speed of the inner cardboard 6 on the conveyor rail 1, and ultimately ensures the accuracy and reliability of the conveying equipment when conveying the inner cardboard 6, thus ensuring the cutting quality of the inner cardboard 6 during subsequent cutting.

[0036] In this embodiment, the control processing module may include a processor and an encoder. The processor processes the images captured by the vision camera 21 and calculates the conveying error. The encoder obtains the speed of the paper feeding servo motor 32 in the paper feeding mechanism 3 and drives the vision camera 21 to capture images of the paper jammed on the conveying guide rail 1 based on the driving status of the paper feeding servo motor 32.

[0037] It should be noted that the control processing module in the paper feeding mechanism 3 has three functions. First, it is connected to the vision camera 21 to drive the vision camera 21 to perform actions. Second, it is connected to the paper feeding servo motor 32 in the paper feeding mechanism 3. The paper feeding servo motor 32 has a position feedback function. Therefore, the encoder set in the control processing module can obtain the real-time speed of the paper feeding servo motor 32 in the paper feeding mechanism 3, which is convenient for subsequent adjustment of the speed of the paper feeding servo motor 32 in the paper feeding mechanism 3. Third, it outputs a corresponding electrical signal to the paper feeding mechanism 3 according to the conveying error to control the driving speed of the paper feeding servo motor 32 in the paper feeding mechanism 3.

[0038] As an optional implementation, such as Figure 1-2 As shown, the paper feeding mechanism 3 includes a paper feeding roller 31 and a paper feeding servo motor 32. The paper feeding roller 31 is connected to and driven by the paper feeding servo motor 32. Specifically, the paper feeding servo motor 32 can precisely control the rotation speed of the paper feeding roller 31, thereby ensuring the stable feeding of the inner cardboard 6 on the conveying guide rail 1. The paper feeding servo motor 32 has high-performance speed control and position feedback functions, and can quickly respond to the electrical signals issued by the control processing module in the vision mechanism 2, making real-time adjustments to the feeding error. This ensures the accuracy and reliability of the inner cardboard 6 during the feeding process. It can cooperate with the conveying guide rail 1 and the vision mechanism 2 to efficiently and stably feed the inner cardboard 6, providing a favorable guarantee for subsequent cutting work.

[0039] As an optional implementation method, such as Figure 2 As shown, the paper feeding roller 31 includes a first paper feeding roller 311 and a second paper feeding roller 312. The first paper feeding roller 311 and the second paper feeding roller 312 are located on the upper and lower sides of the conveying guide rail 1, respectively. The first paper feeding roller 311 is connected to the paper feeding servo motor 32 through a first coupling 33 and a first connecting flange 34. The second paper feeding roller 312 is connected to the first paper feeding roller 311 through a first transmission component.

[0040] Specifically, the first paper feed roller 311 is the driving roller, and the second paper feed roller 312 is the driven roller. The first pressure roller and the second pressure roller 41 rotate synchronously. The first paper feed roller 311 is directly connected to the paper feed servo motor 32, and power is transmitted through the first coupling 33 and the first connecting flange 34, ensuring precise power transmission and efficient conversion. The second paper feed roller 312 is connected to the first paper feed roller 311 through the first transmission component. This transmission method not only simplifies the structure but also improves the stability and reliability of the equipment.

[0041] During the conveying process, the second paper feeding roller 312, the first paper feeding roller 311, and the paper feeding servo motor 32 work together to drive the inner paper jam 6 to move smoothly forward on the conveying guide rail 1. Because the paper feeding servo motor 32 has high-performance speed control and position feedback functions, it can adjust the rotation speed of the paper feeding roller 31 in real time, ensuring the accuracy and reliability of the inner paper jam 6 during the conveying process.

[0042] As an optional implementation method, such as Figure 1-2 As shown, the conveying equipment also includes a paper pressing mechanism 4, which is mounted on the frame 5 and located in the conveying direction of the inner cardboard 6. The paper pressing mechanism 4 is communicatively connected to the vision mechanism 2 and is used to adjust the pressing speed of the inner cardboard 6 on the conveying guide rail 1 according to the conveying error. The paper pressing mechanism 4 includes a paper pressing roller and a paper pressing servo motor 43, which is connected to and driven by the paper pressing servo motor 43.

[0043] Specifically, the paper-pressing servo motor 43 is identical to the paper-feeding servo motor 32, possessing high-performance speed control and position feedback functions. This allows the paper-pressing roller to adjust its pressing speed in real time based on conveying errors under the control and processing module. When the inner paper jam 6 is detected to be ahead or behind on the conveying guide rail 1, the paper-pressing servo motor 43 can respond quickly and adjust the rotation speed of the paper-pressing roller to ensure that the inner paper jam 6 can move accurately along the conveying guide rail 1, improving the accuracy and reliability of the conveying equipment.

[0044] It should be noted that the control processing module in the paper pressing mechanism 4 also has three functions. First, it is connected to the vision camera 21 to drive the vision camera 21 to perform actions. Second, it is connected to the paper pressing servo motor 43 in the paper pressing mechanism 4. The paper pressing servo motor 43 has a position feedback function. Therefore, the control processing module can obtain the real-time speed of the paper pressing servo motor 43 in the paper pressing mechanism 4, which is convenient for subsequent adjustment of the speed of the paper pressing servo motor 43 in the paper pressing mechanism 4. Third, it outputs a corresponding electrical signal to the paper pressing mechanism 4 according to the conveying error to control the driving speed of the paper pressing servo motor 43 in the paper pressing mechanism 4.

[0045] As an optional implementation method, such as Figure 2 As shown, the paper pressing roller includes a first paper pressing roller (not shown) and a second paper pressing roller 41. The first paper pressing roller and the second paper pressing roller 41 are located on the upper and lower sides of the conveying guide rail 1, respectively. The first paper pressing roller is connected to the paper pressing servo motor 43 through a second coupling 44 and a second connecting flange 45. The second paper pressing roller 41 is connected to the first paper pressing roller through a second transmission component.

[0046] Specifically, the first pressure roller is the driving roller, and the second pressure roller 41 is the driven roller. The first and second pressure rollers 41 can rotate synchronously. The first pressure roller is directly connected to the pressure servo motor 43, and power is transmitted through the second coupling 44 and the second connecting flange 45, ensuring precise power transmission and efficient conversion. The second pressure roller 41 is connected to the first pressure roller through a second transmission component. This transmission method not only simplifies the structure but also improves the stability and reliability of the equipment.

[0047] During the conveying process, the second pressure roller 41, the first pressure roller, and the pressure servo motor 43 drive the inner cardboard 6 to move smoothly forward on the conveying guide rail 1 while also indenting the inner cardboard 6. Because the pressure servo motor 43 has high-performance speed control and position feedback functions, it can adjust the rotation speed of the pressure rollers in real time, ensuring the accuracy and reliability of the inner cardboard 6 during the conveying process.

[0048] The second pressure roller 41 is equipped with pressure teeth 42 on its circumference. It should be noted that the design of the pressure teeth 42, in addition to pressing creases into the inner cardboard 6, also increases the friction between the pressure teeth and the inner cardboard 6, allowing for better control of its positional movement during transport. Furthermore, the shape and arrangement of the pressure teeth 42 are carefully calculated to ensure sufficient pressure is provided during the pressing process without damaging the inner cardboard 6. In this embodiment, the second pressure roller 41 not only effectively creases the inner cardboard 6 but also provides stable support and guidance during transport, further improving the cutting accuracy and transport efficiency of the equipment.

[0049] It should be noted that the first transmission component in the paper feeding mechanism 3 and the second transmission component in the paper pressing mechanism 4 can be a transmission belt, which enables synchronous transmission. Of course, other transmission components capable of synchronous transmission between the two components can also be used.

[0050] As an optional implementation method, such as Figure 1-2 As shown, the frame 5 includes a first support frame 51, a second support frame 52, and a third support frame 53, with the second support frame 52 and the third support frame 53 both connected to the first support frame 51; the conveying guide rail 1 is connected to the first support frame 51; the paper feeding mechanism 3 is connected to the first support frame 51 and the second support frame 52 respectively, and is supported by the first support frame 51 and the second support frame 52; the paper pressing mechanism 4 is connected to the first support frame 51 and the second support frame 52 respectively, and is supported by the first support frame 51 and the second support frame 52; and the vision mechanism 2 is supported by the third support frame 53.

[0051] Specifically, such as Figure 1 As shown, the frame 5 includes a first support frame 51, a second support frame 52 and a third support frame 53. The arrangement of the first support frame 51, the second support frame 52 and the third support frame 53 ensures the interconnection between the conveying guide rail 1, the vision mechanism 2, the paper feeding mechanism 3 and the paper pressing mechanism 4, making the connection between each component tighter and ensuring the stability and reliability of the entire equipment.

[0052] The first support frame 51 serves as the main load-bearing structure, supporting the conveying guide rail 1. A support plate 511 is provided on the first support frame 51, and the conveying guide rail 1 is connected to the first support frame 51 through the support plate 511.

[0053] Meanwhile, the first support frame 51 is also connected to the third support frame 53, working together to support the vision mechanism 2. Under the action of the third support frame 53, the vision mechanism 2 is aligned with the conveyor track and can accurately capture the position and status of the inner card 6, providing key information for subsequent work.

[0054] The first support frame 51 is also connected to the second support frame 52, working together to support the paper feeding mechanism 3 and the paper pressing mechanism 4. Supported by the first and second support frames 51 and 52, the paper pressing mechanism 4 can stably apply pressure to the inner cardboard 6, forming uniform indentations. At the same time, the design of the paper pressing mechanism 4 facilitates adjustment and maintenance, improving the flexibility and operability of the equipment. The paper feeding mechanism 3 is also supported by the first and second support frames 51 and 52, ensuring the continuity and stability of the inner cardboard 6 during transport.

[0055] The embodiment is merely a special case and does not indicate that this utility model is implemented in such a way.

[0056] The above description is merely a preferred embodiment of the present utility model. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. Furthermore, under the teachings of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present utility model.

Claims

1. A paper length compensation device, characterized in that, include: The conveying guide rail (1), the vision mechanism (2) and the paper feeding mechanism (3) are all mounted on the frame (5); The conveying guide rail (1) is used to cooperate with the paper feeding mechanism (3) to convey the inner card paper (6); The vision mechanism (2) is located on top of the conveying guide rail (1) and aligned with the conveying guide rail (1). The vision mechanism (2) is used to detect the conveying error of the inner cardboard (6) on the conveying guide rail (1). The paper feeding mechanism (3) is located in the conveying direction of the inner cardboard (6), and the paper feeding mechanism (3) is communicatively connected to the vision mechanism (2); the paper feeding mechanism (3) is used to adjust the conveying speed of the inner cardboard (6) on the conveying guide rail (1) according to the conveying error.

2. The internal paper length compensation device according to claim 1, characterized in that, The vision mechanism (2) includes a vision camera (21) and a control processing module. The control processing module is connected to the vision camera (21) and the paper feeding mechanism (3) respectively. The control processing module is used to detect the conveying error of the inner cardboard (6) from the image captured by the vision camera (21) and convert the conveying error into an electrical signal to adjust the conveying speed of the paper feeding mechanism (3).

3. The internal paper length compensation device according to claim 1, characterized in that, The paper feeding mechanism (3) includes a paper feeding roller (31) and a paper feeding servo motor (32). The paper feeding roller (31) is connected to the paper feeding servo motor (32) and is driven by the paper feeding servo motor (32).

4. The internal paper length compensation device according to claim 3, characterized in that, The paper feeding roller (31) includes a first paper feeding roller (311) and a second paper feeding roller (312). The first paper feeding roller (311) and the second paper feeding roller (312) are located on the upper and lower sides of the conveying guide rail (1), respectively. The first paper feeding roller (311) is connected to the paper feeding servo motor (32) through a first coupling (33) and a first connecting flange (34). The second paper feeding roller (312) is connected to the first paper feeding roller (311) through a first transmission component.

5. The internal paper length compensation device according to claim 1, characterized in that, The conveying equipment also includes a paper pressing mechanism (4), which is mounted on the frame (5) and located in the conveying direction of the inner cardboard (6). The paper pressing mechanism (4) is communicatively connected to the vision mechanism (2), and is used to adjust the pressing speed of the inner cardboard (6) on the conveying guide rail (1) according to the conveying error.

6. The internal paper length compensation device according to claim 5, characterized in that, The paper pressing mechanism (4) includes a paper pressing roller and a paper pressing servo motor (43). The paper pressing roller is connected to the paper pressing servo motor (43) and is driven by the paper pressing servo motor (43).

7. The internal paper length compensation device according to claim 6, characterized in that, The paper pressing roller includes a first paper pressing roller and a second paper pressing roller (41). The first paper pressing roller and the second paper pressing roller (41) are located on the upper and lower sides of the conveying guide rail (1), respectively. The first paper pressing roller is connected to the paper pressing servo motor (43) through a second coupling (44) and a second connecting flange (45). The second paper pressing roller (41) is connected to the first paper pressing roller through a second transmission component.

8. The internal paper length compensation device according to claim 7, characterized in that, The second paper pressure roller (41) is provided with pressure teeth (42) on its circumference.

9. The internal paper length compensation device according to claim 5, characterized in that, The frame (5) includes a first support frame (51), a second support frame (52), and a third support frame (53), both of which are connected to the first support frame (51). The conveying guide rail (1) is connected to the first support frame (51). The paper feeding mechanism (3) is connected to the first support frame (51) and the second support frame (52) respectively, and is supported by the first support frame (51) and the second support frame (52). The paper pressing mechanism (4) is connected to the first support frame (51) and the second support frame (52) respectively, and is supported by the first support frame (51) and the second support frame (52). The vision mechanism (2) is supported by the third support frame (53).

10. The internal paper length compensation device according to claim 9, characterized in that, The first support frame (51) includes a support plate (511), and the conveying guide rail (1) is mounted on the first support frame (51) via the support plate (511).

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