Device for controlling movement of gripper bar by post-press equipment

Abstract

The utility model relates to a post-press equipment gripper bar movement control device which comprises a frame body located at a fixed position, a gripper bar body and two gripper bar chains can pass through the frame body, and a gripper bar movable guide rail and a descending assembly for driving the gripper bar movable guide rail to descend are arranged on the frame body. The frame body is further provided with a driving assembly for driving the descending assembly to descend, the gripper row movable guide rails are arranged on the gripper row chains on the two sides respectively, and the gripper row chain on any side or a gripper row fixing block connecting the gripper row body and the gripper row chains can penetrate through the gripper row movable guide rail on the corresponding side. In the process that the tooth row chains or the tooth row fixing blocks move into the corresponding tooth row movable guide rails, the driving assembly drives the descending assembly to drive the two tooth row movable guide rails to descend gradually. The production quality of post-printing equipment is guaranteed, and meanwhile the possibility that paper on the gripper bar body is scattered in the waste or finished product cleaning process is reduced.

Description

A device for controlling the movement of the printing press teeth. Technical Field

[0001] This application relates to the technical field of paper product manufacturing, and in particular to a device for controlling the movement of gripper bars in post-printing equipment. Background Technology

[0002] Die-cutting machines are essential equipment in post-printing packaging processing. They are mainly used for die-cutting (full cut, half cut), creasing, hot stamping, and lamination of various non-metallic materials, self-adhesive labels, EVA, double-sided tape, electronic components, and mobile phone pads. Die-cutting machines utilize steel blades, metal molds, and steel wire (or templates carved from steel plates) to apply pressure through an impression plate, cutting printed materials or cardboard into specific shapes. Some die-cutting machines also have an automatic waste removal function. After a full cut die-cut, the waste removal function discharges the cut-off material from the equipment.

[0003] In related technologies, this type of post-press equipment generally includes gripper bodies, gripper chains, and feeding devices, impression devices, waste removal devices, finished product cleaning devices, and paper receiving devices arranged sequentially along the paper feed direction. The impression device can include processes such as hot stamping, creasing, and die-cutting. The gripper chain forms a closed loop after passing through the impression device, waste removal device, finished product cleaning device, and paper receiving device. The gripper chain includes a ring chain body and a drive device that drives the ring chain body to move forward continuously. Two gripper chains are spaced apart in a horizontal direction perpendicular to the paper feed direction, and the gripper body is located between the two gripper chain closed loops. The gripper body includes a gripper support rod, the length direction of which is perpendicular to the paper feed direction of the post-press equipment in the horizontal plane. A gripper fixing block is fixed at each end of the gripper support rod, and any one of the gripper fixing blocks fixes the corresponding end of the gripper body to the gripper chain on the corresponding side. The post-press equipment frame is also equipped with gripper support rails, which support the gripper chain on the corresponding side, thus supporting the gripper chain. The gripper support rod is equipped with upper and lower grippers, which can be opened and closed to clamp or release the paper.

[0004] In practice, the gripper clips hold the paper, and the gripper chain drives the gripper body in a cyclical motion, passing sequentially through the stamping device, waste removal device, and finished product removal device. In the paper receiving device, the opening component drives the upper and lower grippers to open, discarding the waste material from the finished product removal process. When the gripper body passes through the finished product removal device, it passes between the lower and upper frames of the finished product. Simultaneously, the distance between the gripper body and the upper side of the lower frame of the finished product varies depending on the type of gripper used; a greater distance makes the paper more prone to scattering. For paper undergoing hot stamping, unlike simple die-cutting or creasing, the paper needs to be closer to the hot stamping block for a better effect. Therefore, an upper gripper structure closer to the hot stamping platform is used. This requires the gripper structure for hot stamping to be further away from the lower frame of the finished product, meaning the gripper chain is further away from the lower frame. In this state, the paper is more likely to scatter during the finished product removal process. Summary of the Invention

[0005] In order to ensure the production quality of post-press equipment while reducing the probability of paper scattering on the gripper body during the cleaning process, this application provides a device for controlling the movement of the gripper in post-press equipment.

[0006] The device for controlling the movement of the printing press in post-press equipment provided in this application adopts the following technical solution:

[0007] A device for controlling the movement of gripper bars in post-press equipment includes a frame located at a fixed position. Gripper bars and two gripper bar chains can pass between the frames. The frame is provided with gripper bar movable guide rails and a descending component that drives the gripper bar movable guide rails to descend. The frame is also provided with a driving component that drives the descending component to descend. There is one gripper bar movable guide rail on each of the two gripper bar chains. The gripper bar chain on either side or the gripper bar fixing block connecting the gripper bar body and the gripper bar chain can pass through the gripper bar movable guide rail on the corresponding side. As the gripper bar chain or the gripper bar fixing block moves into the corresponding gripper bar movable guide rail, the driving component drives the descending component to gradually descend the two gripper bar movable guide rails.

[0008] By adopting the above technical solution, when the fixed blocks at both ends of the gripper body are about to enter the corresponding gripper moving guide rail, the drive component starts to drive the pressing component, thereby causing the gripper bodies on both sides to gradually descend as they move along the paper feeding direction, thus shortening the distance between the paper clamped on the gripper body and the lower frame of the finished product, thereby reducing the occurrence of paper scattering during the finished product cleaning operation.

[0009] Preferably, the frame is further provided with a drive shaft rotatably connected thereto. The lowering assembly includes a cam fixed to one end of the drive shaft. A swing plate is provided on the upper side of the cam. One end of the swing plate is rotatably connected to the frame, and the other end of the swing plate is rotatably connected to a connecting rod. The rotation direction between the swing plate and the frame is parallel to the rotation direction of the drive shaft. A driven wheel is provided in the middle of the swing plate. The axis of the driven wheel is parallel to the axis of rotation of the swing plate and the frame. The lower side of the driven wheel abuts against the surface of the cam wheel. The cylindrical surface of the driven wheel slides relative to the working side of the cam along the working trajectory line of the cam. The upper end of the connecting rod is rotatably connected to the swing plate in a direction parallel to the axis of the drive shaft. The lower end of the connecting rod is rotatably connected to the corresponding side of the tooth bar movable guide rail in the paper feeding direction. One cam, one swing plate, and one connecting rod are provided on each side of the drive shaft, forming two sets. The driving assembly drives the drive shaft to rotate around its own axis. A pressing assembly is also provided on each of the tooth bar movable guide rails to keep it pressed down.

[0010] By adopting the above technical solution and through a rationally designed cam working trajectory, the two gripper bar movable guide rails drive the gripper bar chain and the gripper bar body on the chain to descend smoothly in the vertical direction, reducing the possibility of paper scattering or damage that may occur due to excessive descent speed. The drive shaft is driven to rotate via a drive assembly, which in turn drives the cam fixed on it to rotate. The working side of the cam contacts the driven wheel, pushing the swing plate to swing around its rotational connection point with the frame. The other end of the swing plate is connected to the gripper bar movable guide rail via a connecting rod, realizing the up and down movement of the gripper bar movable guide rail.

[0011] Preferably, the drive assembly drives the transmission shaft to rotate, thereby causing the cam to rotate around the transmission shaft axis. When the point on the working contour line of the cam with the smallest distance from the transmission shaft axis contacts the lower side of the driven wheel, and the toothed roller movable guide rail moves to the lowest point in the vertical direction, the drive assembly continues to drive the cam to rotate, so that the toothed roller movable guide rail gradually returns to its original position.

[0012] By adopting the above technical solution and through the contour design of the cam, the moving guide rail of the gripper bar can be gradually reset after descending to the lowest point, ensuring that the gripper bar body can return to the initial position after completing the action of clamping and releasing the paper, thereby improving the automation level and work efficiency of the equipment.

[0013] Preferably, any of the pressing components includes a tension spring, one end of which is fixed to the frame along its axial direction, and the other end is fixed to the toothed row movable guide rail on the corresponding side.

[0014] By adopting the above technical solution, the elasticity of the tension spring continuously applies downward pressure to the moving guide rail of the tooth bar, ensuring that the moving guide rail of the tooth bar remains stable during descent, preventing positional displacement caused by external force or vibration, and improving the operational stability of the equipment.

[0015] Preferably, the fixing plate at one end of any of the tension springs is rotatably connected to the movable guide rail of the gripper bar along the paper feeding direction, and the other end is rotatably connected to the frame body along the width direction of the frame body.

[0016] By adopting the above technical solution, the two ends of the tension spring are connected to the movable guide rail and the frame of the tooth bar through a rotating connection, so that the tension spring can freely adjust its angle during the up and down movement of the movable guide rail of the tooth bar, always maintain an appropriate tension, and ensure the stability of the guide rail.

[0017] Preferably, any of the tooth bar fixing blocks is further provided with a limiting component on the side opposite to the tooth bar chain to restrict the movement of the tooth bar movable guide rail in the vertical direction.

[0018] Preferably, any one of the limiting components includes a slide rail and a slider. The slide rail is fixed on the movable guide rail of the toothed bar, and the slider is fixed on the frame. The slide rail is embedded in the corresponding slider in the vertical direction and slides and cooperates with the slider in the vertical direction.

[0019] Preferably, the drive assembly is configured as a drive motor, a drive pulley, and a synchronous belt. The drive motor housing is fixed relative to the frame. The axis of the drive pulley is parallel to the width direction of the frame. Two drive pulleys are spaced apart along the paper feeding direction. One drive pulley is coaxially fixed to the transmission shaft, and the other drive pulley is coaxially fixed to the output shaft of the drive motor.

[0020] Preferably, it can be fixed downstream of the paper feeding device along the paper feeding direction. When the gripper body enters the middle of the cleaning device, the gripper movable guide rail begins to move downward in the vertical direction. When the point with the smallest distance between the working contour line of the cam and the transmission axis contacts the lower side of the driven wheel, the gripper fixing block is located inside the gripper movable guide rail, and the lower side of the paper clamped by the gripper body contacts the upper side of the cleaning lower frame.

[0021] By adopting the above technical solution, when the gripper body holds the paper and passes through the cleaning device, the setting of the gripper movable guide rail ensures that the edge of the paper accurately falls on the downstream edge of the lower frame. When the lower side of the paper contacts the upper side of the lower frame, the maximum profile point of the cam contacts the driven wheel, and then the cam continues to rotate. During this process, the motion trajectory of the cam triggers the descent or reset action of the gripper movable guide rail, realizing the accurate release of the paper.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By driving the descending component through the drive component, the precise downward pressure and position guidance of the gripper bar moving guide rail are achieved, so that the clamped paper can be accurately placed in the appropriate position of the finished product lower frame, which significantly reduces paper spillage and offset, improves the success rate of finished product separation, and reduces the number of machine stoppages due to unsuccessful box separation.

[0024] 2. The left and right gripper bar slides descend slowly via a cam-swing plate-connecting rod mechanism, driven by a unified drive assembly, reducing paper scattering during movement. Simultaneously, the synchronized, uniform, and controllable descent of the gripper bar slides effectively prevents tilting or paper displacement due to guide rail imbalance during clamping, improving clamping and transmission stability.

[0025] 3. The limit component prevents the guide rail from exceeding the displacement range. It works with the tension spring to provide continuous downward pressure, ensuring that the guide rail always runs stably during descent and reset, preventing shaking and mechanical interference, thereby improving the reliability and durability of the whole machine. Attached Figure Description

[0026] Figure 1 is a top view of the structure of one end of the tooth rack body and the tooth rack chain part of this application;

[0027] Figure 2 is a partial motion trajectory diagram of the tooth rack body in the post-printing equipment in an embodiment of this application (X direction is the paper feeding direction, Z direction is the vertical direction);

[0028] Figure 3 is an isometric view of the overall structure of the post-press equipment control gripper movement device on the frame of the post-press equipment in the embodiment of this application (X direction is the paper feeding direction, Y direction is the frame width direction, and Z direction is the vertical direction).

[0029] Figure 4 is an isometric view of the overall structure of the post-press equipment control tooth rack motion device in the embodiment of this application;

[0030] Figure 5 is an enlarged view of a portion of the structure in the embodiment of this application, which mainly illustrates the structure between the tooth row movable guide rail and the tooth row body.

[0031] Reference numerals: 1. Moving guide rail for toothed rack; 11. Slide groove; 12. Support frame; 2. Drive shaft; 3. Drive pulley; 4. Lowering assembly; 41. Cam; 42. Swing plate; 43. Driven wheel; 44. Connecting rod; 5. Tension spring; 6. Slide rail; 7. Slider; 100. Frame; 200. Finished product cleaning device; 210. Finished product cleaning upper frame; 220. Finished product cleaning lower frame; 300. Toothed rack chain; 400. Toothed rack body; 410. Toothed rack fixing block; 420. Toothed plate. Detailed Implementation

[0032] The present application will be further described in detail below with reference to Figures 1-5.

[0033] This application discloses a device for controlling the movement of dental arches in post-press equipment.

[0034] Referring to Figures 1 and 2, the post-press equipment includes a frame 100, a gripper bar body 400, a gripper bar chain 300, and feeding devices, printing devices, waste removal devices, finished product removal devices 200, and paper receiving devices arranged sequentially along the paper feeding direction, all mounted on the frame 100. The post-press equipment's gripper bar movement control device also includes the frame 100; this frame 100 is the frame 100 of the post-press equipment. The length direction of the frame 100 is the paper feeding direction, and its width direction is perpendicular to the paper feeding direction on the horizontal plane.

[0035] Referring to Figures 1 and 3-5, the post-press equipment control device for the gripper bar movement also includes a support frame 12, a drive assembly, a lowering assembly 4, and a gripper bar movable guide rail 1. The support frame 12 extends through one side of the frame 100 along its width and is movably mounted on the frame 100 within a certain range. The gripper bar movable guide rail 1 is detachably fixed to the support frame 12. The length direction of the gripper bar movable guide rail 1 is parallel to the paper feed direction. A groove 11 is provided on the gripper bar movable guide rail 1, through which the gripper bar chain 300 and the gripper bar fixing block 410 pass. When the lowering assembly 4 drives the gripper bar movable guide rail 1 to move vertically, the gripper bar movable guide rail 1 will drive the gripper bar fixing block 410 and / or the gripper bar chain 300 within its groove 11 to move downwards vertically. One support frame 12, one lowering assembly 4, and one gripper bar movable guide rail 1 are provided on each side of the frame 100 along its width. The slide grooves 11 on the two toothed guide rails 1 are open on the side that is close to each other.

[0036] The drive assembly is located on one side of the frame 100 in the width direction and includes a drive motor, drive pulleys 3, and a synchronous belt. The housing of the drive motor is fixed to the frame 100. The axis of the drive pulleys 3 is parallel to the width direction of the frame 100. Two drive pulleys 3 are spaced apart along the paper feeding direction, and the synchronous belt is wound around the two drive pulleys 3. A transmission shaft 2 is also provided on the frame 100. The axis of the transmission shaft 2 is parallel to the width direction of the frame 100, and both ends of the transmission shaft 2 are rotatably connected to the frame 100 around their own axis. One drive pulley 3 is coaxially fixed to the output shaft of the drive motor, and the other drive pulley 3 is coaxially fixed to or connected to the transmission shaft 2.

[0037] Two lowering components 4 are respectively disposed on both sides of the drive shaft 2. Each lowering component 4 includes a cam 41, the thickness direction of which is parallel to the axis of the drive shaft 2, and the rotation axis of the cam 41 is coaxially fixed with the drive shaft 2. A swing plate 42 is also provided on the cam 41, the thickness direction of which is parallel to the width direction of the frame 100, one end of the swing plate 42 is rotatably connected to the frame 100, and the other end of the swing plate 42 is rotatably connected to the connecting rod 44. The rotation direction between the swing plate 42 and the frame 100 is parallel to the rotation direction of the drive shaft 2. A driven wheel 43 is provided in the middle of the swing plate 42, and the driven wheel 43 is rotatably connected to the swing plate 42 around its own axis. The lower end of the peripheral side of the driven wheel 43 abuts against the upper side of the cam 41. The drive shaft 2 drives the cam 41 to rotate, and the distance between the working contour line of the cam 41 and the axis of the drive shaft 2 changes, thereby pushing the driven wheel 43 to move in the vertical direction, which in turn drives the swing plate 42 to rotate around the axis rotatably connected to the frame 100.

[0038] The connecting rod 44 is vertically positioned, with its upper end rotatably connected to the swing plate 42 in a direction parallel to the width of the frame 100. The lower end of the connecting rod 44 is rotatably connected to the support frame 12 in the paper feeding direction. The drive motor drives the transmission shaft 2 to rotate, which in turn drives the cam 41 to rotate. The cam 41 pushes the swing plate 42 to rotate, thereby causing the connecting rod 44 to slide vertically. The connecting rod 44 drives the support frame 12, which in turn moves the gripper bar movable guide rail 1 vertically.

[0039] Each support frame 12 is also equipped with a pressing component, which includes a tension spring 5. The tension spring 5 is vertically arranged, and the fixing plate at the upper end of the tension spring 5 is rotatably connected to the support frame 12 around the paper feeding direction. The fixing plate at the lower end of the tension spring 5 is rotatably connected to the frame body 100. When the point on the working contour line of the cam 41 with the largest distance between it and the axis of the transmission shaft 2 contacts the lower side of the driven wheel 43, the corresponding toothed row movable guide rail 1 is located at the highest point of its vertical stroke. As the transmission shaft 2 continues to drive the cam 41 to rotate, the distance between the working contour line on the cam 41 and the axis of the transmission shaft 2 gradually decreases. Due to the design of the working contour line of the cam 41, the movable range of the support frame 12 in the vertical direction gradually increases. Meanwhile, the tension spring 5 on the corresponding side continuously provides a downward force to the support frame 12. When the movable range of the support frame 12 increases, the tension spring 5 will gradually pull the support frame 12 downward, causing the tooth row movable guide rail 1 to gradually descend. This helps to improve the smoothness of the tooth row fixing block 410 sliding between the tooth row guide rails and reduce the possibility of the tooth row movable guide rail 1 colliding with the corresponding tooth row fixing block 410.

[0040] Each support frame 12 is also provided with a limiting component, which includes a slide rail 6 and a slider 7. The slide rail 6 is vertically arranged and fixed on the support frame 12. The slide rail 6 is embedded in the slider 7 in the vertical direction and slides with the slider 7 in the vertical direction. The slider 7 is fixed on the frame 100.

[0041] The implementation principle of the gripper movement control device for post-press equipment in this embodiment is as follows: During the operation of the post-press equipment, the gripper body 400 clamps the paper at the feeding device. The drive device of the gripper chain 300 drives the annular chains on both sides of the gripper body 400 to move forward synchronously, thereby driving the gripper body 400 and the paper to move forward along the paper feeding direction. In this embodiment, the gripper movement control device for post-press equipment is located downstream of the cleaning device 200. Any gripper movable guide rail 1 is located on the upper downstream side of the cleaning lower frame 220. When the gripper is moving, the cam 41 rotates to a position where the connecting rod 44 can move up and down. The working contour line with a changed diameter in the cam abuts against the swing plate 42, causing the connecting rod 44 to drive the support frame 12 to move downward in the vertical direction. The gripper movable guide rail 1 drives the inner gripper chain 300 to gradually descend, and the corresponding gripper fixing block 410 gradually enters the gripper movable guide rail 1, thereby causing the gripper body 400 to gradually approach the cleaning lower frame 220. When the point on the working contour line of cam 41 with the minimum distance between it and the axis of transmission shaft 2 contacts the lower side of driven wheel 43, tension spring 5 pulls support frame 12 to move downwards in the vertical direction, causing the lower side of the paper clamped by gripper body 400 to contact the upper side of finished product frame 220. The drive motor continues to drive transmission shaft 2 to rotate, thereby causing cam 41 to push up swing plate 42. Swing plate 42 pulls support frame 12 upwards via connecting rod 44, and the two gripper movable guide rails 1 on both sides drive the entire gripper body 400 to reset. In actual work, the operator can design the working contour line of cam 41 and the length of gripper movable guide rail 1 according to the actual situation.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for controlling the movement of gripper bars in post-press equipment, comprising a frame (100) located in a fixed position, wherein gripper bar bodies (400) and two gripper bar chains (300) can pass between the frame bodies (100), characterized in that: The frame (100) is provided with a tooth row movable guide rail (1) and a descending component (4) for driving the tooth row movable guide rail (1) to descend. The frame (100) is also provided with a driving component for driving the descending component (4) to descend. There is one tooth row movable guide rail (1) on each of the tooth row chains (300) on both sides. The tooth row chain (300) on either side or the tooth row fixing block (410) connecting the tooth row body (400) and the tooth row chain (300) can pass through the tooth row movable guide rail (1) on the corresponding side. During the process of the tooth row chain (300) or the tooth row fixing block (410) moving into the corresponding tooth row movable guide rail (1), the driving component drives the descending component (4) to drive the two tooth row movable guide rails (1) to descend gradually.

2. The device for controlling the movement of the printing press in post-press equipment according to claim 1, characterized in that: The frame (100) is also provided with a transmission shaft (2) rotatably connected thereto. The lowering assembly (4) includes a cam (41) fixed to one end of the transmission shaft (2). A swing plate (42) is provided on the upper side of the cam (41). One end of the swing plate (42) is rotatably connected to the frame (100), and the other end of the swing plate (42) is rotatably connected to the connecting rod (44). The rotation direction between the swing plate (42) and the frame (100) is parallel to the rotation direction of the transmission shaft (2). A driven wheel (43) is provided in the middle of the swing plate (42). The axis of the driven wheel (43) is parallel to the axis of rotation of the swing plate (42) and the frame (100). The driven wheel (43) is lower The side abuts against the surface of the cam (41). The cylindrical surface of the driven wheel (43) slides relative to the working side of the cam (41) along the working trajectory line of the cam (41). The upper end of the connecting rod (44) is rotatably connected to the swing plate (42) in a direction parallel to the axis of the transmission shaft (2). The lower end of the connecting rod (44) is rotatably connected to the corresponding side of the tooth row movable guide rail (1) in the paper feeding direction. The cam (41), swing plate (42) and connecting rod (44) are respectively provided on both sides of the transmission shaft (2), forming two sets. The driving component drives the transmission shaft (2) to rotate around its own axis. Each of the tooth row movable guide rails (1) is also provided with a pressing component to keep it pressed down.

3. The device for controlling the movement of the printing press in post-press equipment according to claim 1, characterized in that: The drive assembly drives the transmission shaft (2) to rotate, thereby driving the cam (41) to rotate around the axis of the transmission shaft (2). When the point on the working contour line of the cam (41) with the smallest distance from the axis of the transmission shaft (2) contacts the lower side of the driven wheel (43), the toothed roller movable guide rail (1) moves to the lowest point in the vertical direction. The drive assembly continues to drive the cam (41) to rotate, so that the toothed roller movable guide rail (1) gradually returns to its original position.

4. The device for controlling the movement of the gripper bar in post-press equipment according to claim 2, characterized in that: Any of the pressing components includes a tension spring (5), one end of which is fixed relative to the frame (100) in the axial direction, and the other end is fixed relative to the tooth row movable guide rail (1) on the corresponding side.

5. A device for controlling the movement of a printing unit according to claim 4, characterized in that: One end of any tension spring (5) is fixed and rotatably connected to the toothed bar movable guide rail (1) in the paper feeding direction, and the other end is rotatably connected to the frame (100) in the width direction of the frame (100).

6. The device for controlling the movement of the gripper bar in post-press equipment according to claim 2, characterized in that: Each of the tooth row fixing blocks (410) is also provided with a limiting component on the side opposite to the tooth row chain (300) to restrict the tooth row moving guide rail (1) from moving in the vertical direction.

7. A device for controlling the movement of a printing unit according to claim 6, characterized in that: Each of the limiting components includes a slide rail (6) and a slider (7). The slide rail (6) is fixed on the toothed row movable guide rail (1), and the slider (7) is fixed on the frame (100). The slide rail (6) is embedded in the corresponding slider (7) in the vertical direction and slides and cooperates with the slider (7) in the vertical direction.

8. A device for controlling the movement of a printing unit according to claim 2, characterized in that: The drive assembly is configured as a drive motor, a drive pulley (3) and a synchronous belt. The drive motor housing is fixed relative to the frame (100). The axis of the drive pulley (3) is parallel to the width direction of the frame (100). There are two drive pulleys (3) spaced apart along the paper feeding direction. One drive pulley (3) is coaxially fixed with the transmission shaft (2), and the other drive pulley (3) is coaxially fixed with the output shaft of the drive motor.

9. A device for controlling the movement of a printing unit according to claim 3, characterized in that: It can be fixed downstream of the paper feeding direction of the cleaning device (200). When the gripper body (400) enters the middle of the cleaning device (200), the gripper movable guide rail (1) begins to move downward in the vertical direction. When the point with the smallest distance between the working contour line of the cam (41) and the axis of the transmission shaft (2) contacts the lower side of the driven wheel (43), the gripper fixing block (410) is located inside the gripper movable guide rail (1), and the lower side of the paper clamped by the gripper body (400) contacts the upper side of the cleaning lower frame (220).

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