Automatic film changing process

Abstract

This invention relates to the field of film unwinding technology, and in particular to an automatic film changing process. The process involves mounting a film roll onto a reel; first, one reel is in a working position, and the other is in a non-working position. The film head of the film roll in the working position is led out to the next process; the film head of the other film roll is led out and positioned on a suction assembly, and an adhesive layer is applied; when unwinding is complete, a clamping assembly clamps and fixes the film tail, the film feeding drive mechanism stops driving, and the film buffered in the film buffer mechanism continues to output; the other film roll is moved to the working position; the film head is actively adhered to the tail of the other film; the support plate of the unwound reel is moved to the non-working position, and a new film roll is replaced on the reel. By using this device, the entire film unwinding production line can operate continuously without stopping to replace the film roll, thereby improving production efficiency, reducing operator on-duty time, and lowering labor costs.

Description

Technical Field

[0001] This invention relates to the field of film unwinding technology, and in particular to an automatic film changing process. Background Technology

[0002] Common card designs include cards with a transparent film attached to the surface. During the production of these cards, operators typically load a roll of film onto a rotating roller. After the film is unwound, the production line is shut down, a new roll of film is installed on the rotating roller, and the end of the previous roll of film is taped to the beginning of the next roll. The production line is then restarted for further production.

[0003] The aforementioned production process requires long-term on-site operators to be stationed alongside the production line to replace new film rolls and bond the end of one film to the beginning of the next, incurring corresponding labor costs for the company. More significantly, the entire production line requires intermittent shutdowns, disrupting continuous production and necessitating improvements in production efficiency. Summary of the Invention

[0004] In order to achieve continuous unwinding of film and improve production efficiency, this invention provides an automatic film changing process.

[0005] The automatic film changing process provided by this invention adopts the following technical solution: An automatic film changing process utilizes an automatic film changing device. The device includes a frame on which a translation drive mechanism, a film feeding drive mechanism, and a film buffer mechanism are sequentially mounted. Two translation drive mechanisms are arranged vertically and operate alternately. Each translation drive mechanism includes a support plate for lateral movement. A roller for loading a film roll is rotatably mounted on the support plate. A film end positioning mechanism is also mounted on the support plate. The film end positioning mechanism includes a mounting frame. A suction component for positioning the film head and a clamping component for positioning the film tail are mounted on the mounting frame. A vertical drive mechanism for driving the mounting frame to move vertically is also mounted on the support plate. The automatic film changing process includes the following steps: S1. Before the production line starts running, install two new film rolls onto two reels respectively; S2. Adjust the position of the two support plates so that one of the rolls is in the working position and the other roll is in the non-working position. Lead out the film head of the film roll in the working position, and output it to the next process after passing through the clamping assembly, suction assembly, film driving mechanism, and film buffer mechanism. S3. During the operation of the production line, the operator leads out the film head of the film roll that is not in the working position, passes through the clamping component and is adsorbed and positioned on the suction component, and applies an adhesive layer to the film head. S4. When the film roll in the working position is unwound, the clamping component clamps and fixes the tail of the film, the film feeding drive mechanism stops driving, and the film buffered in the film buffer mechanism continues to be output. S5. The support plate in the non-working position moves to the working position, driving another roll of film to move to the working position; S6. The vertical movement drive mechanism on the same side as the film roll drives the head of the film adsorbed by the suction component to actively adhere to the tail of another film. Then the suction component stops adsorbing, the clamping component releases the clamping restriction on the tail of the film, and the vertical movement drive mechanism on the same side as the clamping component that is released from clamping drives the mounting frame to move away from the center of the frame into place. After the two suction components are separated, the film feeding drive mechanism starts to work. S7. After the unwinding is completed, the support plate where the roll is located is moved to the non-working position. The operator installs the new film roll onto the roll, leads out the film head and attaches it to the suction assembly, and applies an adhesive layer to the film head.

[0006] By adopting the above technical solution, the entire film unwinding production line can operate continuously without stopping to replace the film roll, thereby improving production efficiency and reducing the time operators spend on duty, thus lowering labor costs.

[0007] Preferably, the suction assembly includes a suction box, which includes a box body and a mesh plate installed on the opening side of the box body. A fan is installed on the box body, and the fan draws away the gas inside the box body to form a negative pressure, causing the membrane head to be adsorbed and positioned on the mesh plate.

[0008] By adopting the above technical solution, the fan draws out the gas inside the box, creating a negative pressure inside the box, which causes the film head to be adsorbed and positioned on the mesh plate, thereby facilitating the transport of the film head and bonding and fixing the film head to the tail of the previous film.

[0009] Preferably, the clamping assembly includes a cylinder, a guide roller rotatably mounted inside the mounting frame, and a clamping block mounted on the end of the piston rod of the cylinder. When the piston rod of the cylinder extends, the clamping block cooperates with the guide roller to clamp and fix the tail of the film.

[0010] By adopting the above technical solution, when the cylinder extends, the clamping block and the guide roller clamp and fix the tail of the film to position the tail of the film, which facilitates the subsequent bonding of the tail of the film to the head of the next film.

[0011] Preferably, the vertical movement drive mechanism includes a second cylinder mounted vertically on the support plate. The piston rod end of the second cylinder is connected to the mounting frame. The mounting frame is slidably connected to the support plate vertically. The piston rod of the second cylinder extends to drive the suction box to move up and down, thereby driving the film head to move and adhere to the tail of another film.

[0012] By adopting the above technical solution, the extension and retraction of the piston rod of the cylinder drives the mounting frame to move, so as to move the head of the film closer to the tail of another film, thereby achieving automatic bonding and connecting the two films end to end.

[0013] Preferably, a second sensor for detecting whether the film roll has been unwound is installed on the support plate.

[0014] By adopting the above technical solution, when the unwinding is completed and the sensor 2 does not detect the film, it will send a signal back to the PLC controller to automatically perform subsequent film splicing and roll change operations.

[0015] Preferably, a transverse slide rail is installed on the frame, and a transverse slider is installed on the transverse slide rail. The transverse slider is connected to the support plate. Each support plate is equipped with a set of servo motors and ball screws. The servo motors transmit power to the ball screws through a drive pulley, a transmission belt, and a driven pulley. The rotation of the ball screw shaft drives the ball screw nut, and the ball screw nut is connected to the support plate.

[0016] By adopting the above technical solution, with the cooperation of the horizontal slider and the horizontal slide rail, the servo motor indirectly drives the support plate to move horizontally in a stable manner.

[0017] Preferably, the film-driving mechanism includes a support frame mounted on the frame, an active roller and a driven roller rotatably mounted in the support frame and arranged vertically, a servo motor II mounted on the frame, and the servo motor II transmits power to the active roller through an active pulley II, a transmission belt II, and a driven pulley II. The film passes between the active roller and the driven roller, and the driven roller cooperates with the active roller to elastically clamp the film. The film is driven by the active roller.

[0018] By adopting the above technical solution, the rotation of the active roller relies on friction to drive the film forward, and the second servo motor provides continuous power for the rotation of the active roller.

[0019] Preferably, the film buffer mechanism includes a second guide roller rotatably mounted on the top of the frame, and a third guide roller for vertical movement disposed below the second guide roller, so that the film passes sequentially around the second guide roller and the third guide roller.

[0020] By adopting the above technical solution, the film buffer mechanism is used to store the film used in the process of bonding the tail of the previous film and the head of the next film, so that the production line can continue to operate. The positions of guide roller three and guide slider two are dynamically adjusted by the film tension and the gravity of guide roller three itself.

[0021] Preferably, a correction device is installed on the frame at the output end of the film buffer mechanism, and the position of the film is corrected by adjusting the angle of the guide roller of the correction device.

[0022] By adopting the above technical solution, the position of the film can be corrected by adjusting the angle of the guide roller of the correction instrument, and the effect is significant. Attached Figure Description

[0023] Figure 1 This is a front view of the apparatus used in the automatic film changing process of this invention.

[0024] Figure 2 This is a rear view of the apparatus used in the automatic film changing process of this invention.

[0025] Figure 3 This is a schematic diagram of the membrane travel path according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the cooperation between the membrane end positioning mechanism and the vertical movement drive mechanism used in the automatic membrane changing process of this invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Translation drive mechanism; 21. Support plate; 22. Transverse slide rail; 23. Transverse slider; 24. Servo motor 1; 25. Ball screw; 26. Driving pulley 1; 27. Driven pulley 1; 28. Transmission belt 1; 29. ​​Sensor 1; 3. Reel; 31. Film roll; 32. Positioning nut; 4. Film end positioning mechanism; 41. Mounting frame; 411. Mounting vertical plate; 412. Mounting beam; 42. Suction assembly; 421. Suction box; 4211. Box body; 4212. Mesh plate; 422. Fan; 43. Cylinder 1; 44. Clamping block; 45. Guide roller 1; 46. Sensor 2; 5. Vertical movement drive mechanism; 51. Suspension; 52. Cylinder 2; 53. Vertical slide rail 1; 54. Vertical slider 1; 55. Baffle; 56. Sensor 3; 6. Film feeding drive mechanism; 61. Support frame; 62. Drive roller; 63. Driven roller; 64. Support spring 1; 65. Servo motor 2; 66. Drive pulley 2; 67. Driven pulley 2; 68. Transmission belt 2; 7. Film buffer mechanism; 71. Guide roller 2; 72. Vertical slide rail 2; 73. Vertical slider 2; 74. Guide roller 3; 75. Support spring 2; 8. Correction device. Detailed Implementation

[0028] The following combination Figures 1-4 The present invention will be described in further detail below.

[0029] This invention discloses an automatic film changing process, which uses an automatic film changing device. The device includes a frame 1, a translation drive mechanism 2, a roll 3, a film end positioning mechanism 4, a vertical drive mechanism 5, a film feeding drive mechanism 6, a film buffer mechanism 7, and a web guiding device 8.

[0030] The translation drive mechanism 2 is arranged in two sets, one above the other, and installed on the left side of the frame 1. The translation drive mechanism 2 includes a vertically arranged support plate 21. The frame 1 is provided with two horizontally arranged transverse slide rails 22 corresponding to each set of translation drive mechanisms 2. A transverse slider 23 is slidably installed on the transverse slide rails 22. The transverse slider 23 is bolted to the back of the support plate 21, so that the support plate 21 can be translated laterally along the transverse slide rails 22.

[0031] A servo motor 24 is fixedly installed on each support plate 21 on the frame 1. The servo motor 24 has an enabled state to control the output shaft to stop. A ball screw 25 is also provided on each support plate 21 on the frame 1. The ball screw 25 is arranged horizontally and its two ends are rotatably supported by bearing seats installed on the frame 1. A drive pulley 26 is installed on the output shaft of the servo motor 24. A driven pulley 27 is installed at the end of the screw shaft of the ball screw 25. A transmission belt 28 is installed between the drive pulley 26 and the driven pulley 27. The nut of the ball screw 25 is bolted to the back of the support plate 21.

[0032] Servo motor 24 transmits power sequentially through drive pulley 26, transmission belt 28, driven pulley 27, ball screw 25, and ball screw 25 nut to support plate 21, thereby driving support plate 21 to move along transverse slide rail 22; a sensor 29 is installed on the frame 1 at the position of the left and right sides of the movement boundary of each support plate 21, and the sensor 29 is used to sense the position of support plate 21.

[0033] The roller 3 is rotatably mounted on the left side of the front of the support plate 21 via a bearing seat. The roller 3 is perpendicular to the support plate 21. A film roll 31 is detachably mounted on the roller 3, and a positioning nut 32 is detachably threaded at the end of the roller 3. The positioning nut 32 is used to prevent the film roll 31 from detaching from the roller 3.

[0034] Two sets of membrane end positioning mechanisms 4 are arranged vertically and installed on the right side of the front of the support plate 21. The membrane end positioning mechanism 4 includes a mounting frame 41, which includes two vertically arranged mounting plates 411. The mounting plates 411 are parallel to the support plate 21. A mounting beam 412 is vertically fixed between the two mounting plates 411. There are two mounting beams 412, one of which is located in the middle of the mounting plate 411, and the other is located on the left side of the mounting plate 411 and close to the middle of the frame 1.

[0035] A suction assembly 42 is also provided between the two mounting vertical plates 411. The suction assembly 42 includes a suction box 421 and a fan 422. The suction box 421 includes a box body 4211. The box body 4211 is located on the right side of the mounting vertical plate 411 and close to the middle of the frame 1. The box body 4211 is bolted to the mounting vertical plates 411 on both sides. The opening of the upper box body 4211 is set downward, and the opening of the lower box body 4211 is set upward. A mesh plate 4212 is fixedly installed on the opening side of the box body 4211. The fan 422 is installed on the side of the box body 4211 away from the mesh plate 4212.

[0036] A cylinder 43 is horizontally mounted on the mounting beam 412 located to the left of the mounting vertical plate 411. The piston rod end of the cylinder 43 is positioned to the right and a clamping block 44 is mounted thereon. Guide rollers 45 are also rotatably mounted on the support plate 21 and between the two mounting vertical plates 411. One of the guide rollers 45 is located to the right of the clamping block 44. The guide roller 45, the cylinder 43, and the clamping block 44 form a clamping assembly. A sensor 46 is also mounted on the front of the support plate 21. The sensor 46 is located between the film roll 31 and the film end positioning mechanism 4. The sensor 46 can be a photoelectric switch adapted to transparent plastic film. The sensor 46 is used to detect whether the film roll 31 has been unwound.

[0037] The vertical movement drive mechanism 5 has two sets arranged vertically and installed on the right side of the front of the support plate 21. The vertical movement drive mechanism 5 includes a suspension 51 fixedly installed on the side of the support plate 21 away from the suction box 421. A second cylinder 52 is vertically installed on the suspension 51. The piston rod end of the second cylinder 52 is connected to the mounting beam 412. A vertical slide rail 53 is fixedly installed on the surface of the support plate 21. A vertical slider 54 is slidably installed on the vertical slide rail 53. The vertical slider 54 is bolted to the mounting vertical plate 411 near the support plate 21. When the piston rod of the second cylinder 52 extends, it can drive the suction box 421 to move closer to the other set of suction boxes 421.

[0038] Near the support plate 21, a baffle 55 extending to the left is installed in the middle of the mounting vertical plate 411. Two sensors 56 are installed vertically on the support plate 21. The two sensors 56 are used to sense the upper and lower limits of the travel of the baffle 55 to determine the position of the mounting bracket 41 in the height direction.

[0039] The film feeding drive mechanism 6 is installed in the middle of the right side of the frame 1. The film feeding drive mechanism 6 includes a support frame 61 fixedly installed on the front of the frame 1. The support frame 61 has an active roller 62 and a driven roller 63 arranged vertically inside it. The active roller 62 and the driven roller 63 are both parallel to the guide roller 45. Support springs 64 for elastic support are provided below both ends of the driven roller 63.

[0040] A servo motor 65 is fixedly installed on the back side of the frame 1. A drive pulley 66 is installed on the output shaft of the servo motor 65. The end of the drive roller 62 passes through the frame 1 and is equipped with a driven pulley 67. A transmission belt 68 is installed between the drive pulley 66 and the driven pulley 67. The servo motor 65 transmits power sequentially through the drive pulley 66, the transmission belt 68, and the driven pulley 67 to the drive roller 62. The film passes between the drive roller 62 and the driven roller 63. The driven roller 63 relies on the support spring 64 to work with the drive roller 62 to elastically press the film. The drive roller 62 provides the power to transport the film forward.

[0041] The film buffer mechanism 7 is installed on the frame 1 and located to the right of the film driving mechanism 6. The film buffer mechanism 7 includes three guide rollers 71 that are rotatably mounted on the top of the frame 1 via bearing seats. The three guide rollers 71 are arranged horizontally at intervals. A vertical slide rail 72 is vertically arranged below the middle guide roller 71. A vertical slider 73 is slidably mounted on the vertical slide rail 72. Two guide rollers 74 are rotatably mounted on the vertical slider 73 via bearing seats. The two guide rollers 74 are arranged horizontally at intervals. Both the guide rollers 71 and the guide rollers 74 are parallel to the guide roller 45. A support spring 75 for elastic support is provided below the vertical slider 73. The vertical slider 73 adjusts its position by its own weight, the weight of the guide rollers 74, and the film tension to achieve dynamic film storage.

[0042] The web guiding device 8 is mounted on the frame 1 and located to the right of the film buffer mechanism 7. The position of the film can be modified by adjusting the angle of the guide rollers of the web guiding device 8. The web guiding device 8 can be a commercially available product that meets the usage requirements, such as the product with model number C300-S-250-60-01. Servo motor 1 24, sensor 1 29, fan 422, cylinder 1 43, sensor 2 46, cylinder 2 52, sensor 3 56, servo motor 2 65, and web guiding device 8 are all connected to a PLC controller and controlled by the PLC controller.

[0043] The automatic film changing process of this invention includes the following steps: S1. Before the production line is started, two new film rolls 31 are installed on two rollers 3 respectively, and the film rolls 31 are locked with positioning nuts 32 at the same time. The purpose is to prevent the film rolls 31 from coming off the rollers 3 during the unwinding process. S2. By controlling the servo motor 24 to adjust the position of the support plate 21, one of the rolls 3 is in the working position and the other roll 3 is in the non-working position. The film head of the film roll 31 in the working position is led out and passes through multiple guide rollers 45 in sequence, through the gap between the clamping block 44 and the guide roller 45, through the corresponding area of ​​the screen plate 4212, through the space between the active roller 62 and the driven roller 63, and alternately winds around the guide roller 71 and the guide roller 74 in a serpentine pattern. Then it enters the web guiding instrument 8 and is output to the next process. S3. During the operation of the production line, the film roll 31 in the working position is unwound normally. During this period, the operator leads out the film head of the film roll 31 in the non-working position and winds it around multiple guide rollers 45 in sequence. After passing through the gap between the clamping block 44 and the guide rollers 45, it is placed at the screen plate 4212. The corresponding fan 422 is started. The fan 422 evacuates the inside of the box 4211. The film head is adsorbed and positioned on the screen plate 4212. Then, double-sided tape is attached to the film head. The double-sided tape is used as an adhesive layer. S4. When the film roll 31 in the working position is unwound, the sensor 2 46 cannot detect the film and sends a feedback signal to the PLC controller. The PLC controller controls the piston rod of the cylinder 1 43 to extend, so that the clamping block 44 cooperates with the guide roller 1 45 to clamp and fix the tail of the film. At the same time, it controls the servo motor 2 65 to stop driving, and the film buffered in the film buffer mechanism 7 continues to be output without affecting the normal operation of the production line. S5, the PLC controller controls the corresponding non-working position servo motor 24 to drive the ball screw 25, the ball screw 25 drives the support plate 21 to move until the sensor 29 detects that it is in position, and the support plate 21 drives another roll of film 31 into the working position. S6. Cylinder 2 52, which is on the same side as film roll 31, drives mounting frame 41 to move closer to another mounting frame 41, so that the head of the film adsorbed by negative pressure actively adheres to the tail of another film. Then, fan 422 is turned off, piston rod of cylinder 1 43 retracts to release clamping block 44 from positioning the tail of film. Cylinder 2 52, which is on the same side as cylinder 1 43 with retracted piston rod, drives mounting frame 41 to move away from the center of frame. After the two suction boxes 421 separate, film feeding drive mechanism 6 starts working. S7. Servo motor 24 drives ball screw 25 to move support plate 21, where unwound roll 3 is located, toward non-working position until sensor 29 detects that it is in place. The operator then installs new film roll 31 onto the roll 3 and leads out the film head. The film head is then adsorbed onto the mesh plate 4212 by the negative pressure generated by fan 422 and double-sided tape is applied. This completes the replacement cycle of one film roll 31.

[0044] The entire film unwinding production line operates continuously without the need for stoppages to replace the film roll 31, thus improving production efficiency. Compared to existing technologies that require long-term operator monitoring and machine downtime, this production line significantly reduces monitoring time. Operators only need to periodically observe the release of the film roll 31 and replace it with a new one when necessary. During normal operation, operators can perform other tasks, thereby reducing labor costs. Alternatively, an audible and visual alarm can be installed on the device and connected to a PLC controller. By setting the timing for operator intervention, the alarm will sound to notify the operator to replace the film roll 31 promptly.

[0045] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic film changing process, characterized in that, An automatic film changing device is used. The device includes a frame (1). A translation drive mechanism (2), a film feeding drive mechanism (6), and a film buffer mechanism (7) are installed on the frame (1) in sequence. Two translation drive mechanisms (2) are arranged vertically and work alternately. The translation drive mechanism (2) includes a support plate (21) for horizontal movement. A roller (3) for loading film roll (31) is rotatably installed on the support plate (21). A film end positioning mechanism (4) is also installed on the support plate (21). The film end positioning mechanism (4) includes a mounting frame (41). A suction assembly (42) for positioning the film head and a clamping assembly for positioning the film tail are installed on the mounting frame (41). A vertical drive mechanism (5) for driving the mounting frame (41) to move vertically is also installed on the support plate (21). The automatic film changing process includes the following steps: S1. Before the production line is started, two new film rolls (31) are installed onto two reels (3) respectively; S2. Adjust the position of the two support plates (21) so that one of the rolls (3) is in the working position and the other roll (3) is in the non-working position. Lead out the film head of the film roll (31) in the working position, and output it to the next process after passing through the clamping assembly, the suction assembly (42), the film driving mechanism (6), and the film buffering mechanism (7). S3. During the operation of the production line, the operator leads out the film head of the film roll (31) which is not in the working position, passes through the clamping component and is adsorbed and positioned on the suction component (42), and applies an adhesive layer to the film head. S4. When the film roll (31) in the working position is unwound, the clamping component clamps and fixes the tail of the film, the film driving mechanism (6) stops driving, and the film buffer in the film buffer mechanism (7) continues to be output. S5. The support plate (21) in the non-working position moves to the working position, driving another roll of film (31) to move to the working position; S6. The vertical movement drive mechanism (5) on the same side as the film roll (31) drives the head of the film adsorbed by the suction assembly (42) to actively adhere to the tail of another film. Then the suction assembly (42) stops adsorbing, the clamping assembly releases the clamping restriction on the tail of the film, and the vertical movement drive mechanism (5) on the same side as the clamping assembly that has been released drives the mounting frame (41) to move away from the center of the frame (1) to the position. After the two suction assemblies (42) are separated, the film-moving drive mechanism (6) starts working. S7. The support plate (21) where the unwound roll (3) is located is moved to the non-working position. The operator installs the new film roll (31) onto the roll (3), leads out the film head and attaches it to the suction assembly (42), and applies an adhesive layer to the film head.

2. The automatic film changing process according to claim 1, characterized in that: The suction assembly (42) includes a suction box (421), which includes a box body (4211) and a mesh plate (4212) installed on the opening side of the box body (4211). A fan (422) is installed on the box body (4211). The fan (422) draws away the gas in the box body (4211) to form a negative pressure, so that the membrane head is adsorbed and positioned on the mesh plate (4212).

3. The automatic film changing process according to claim 2, characterized in that: The clamping assembly includes a cylinder (43), a guide roller (45) rotatably mounted in the mounting frame (41), and a clamping block (44) mounted at the end of the piston rod of the cylinder (43). When the piston rod of the cylinder (43) extends, the clamping block (44) cooperates with the guide roller (45) to clamp and fix the tail of the film.

4. The automatic film changing process according to claim 3, characterized in that: The vertical movement drive mechanism (5) includes a second cylinder (52) mounted vertically on a support plate (21). The piston rod end of the second cylinder (52) is connected to the mounting frame (41). The mounting frame (41) is slidably connected to the support plate (21) in the vertical direction. The piston rod of the second cylinder (52) extends to drive the suction box (421) to move up and down, thereby driving the film head to move and stick to the tail of another film.

5. The automatic film changing process according to claim 3, characterized in that: A sensor 2 (46) is installed on the support plate (21) to detect whether the film roll (31) has been unwound.

6. The automatic film changing process according to any one of claims 1-5, characterized in that: A transverse slide rail (22) is installed on the frame (1), and a transverse slider (23) is installed on the transverse slide rail (22). The transverse slider (23) is connected to the support plate (21). Each support plate (21) is equipped with a set of servo motor (24) and ball screw (25). The servo motor (24) transmits power to the ball screw (25) through the driving pulley (26), the transmission belt (28), and the driven pulley (27). The screw shaft of the ball screw (25) rotates and drives the nut of the ball screw (25). The nut of the ball screw (25) is connected to the support plate (21).

7. The automatic film changing process according to any one of claims 1-5, characterized in that: The film-driving drive mechanism (6) includes a support frame (61) mounted on the frame (1), an active roller (62) and a driven roller (63) rotatably mounted in the support frame (61) and arranged vertically, and a servo motor (65) mounted on the frame (1). The servo motor (65) transmits power to the active roller (62) through the active pulley (66), the transmission belt (68) and the driven pulley (67). The film passes between the active roller (62) and the driven roller (63). The driven roller (63) cooperates with the active roller (62) to elastically clamp the film. The film is driven by the active roller (62).

8. The automatic film changing process according to any one of claims 1-5, characterized in that: The film buffer mechanism (7) includes a second guide roller (71) rotatably mounted on the top of the frame (1), and a third guide roller (74) for vertical movement is provided below the second guide roller (71), so that the film passes around the second guide roller (71) and the third guide roller (74) in sequence.

9. The automatic film changing process according to any one of claims 1-5, characterized in that: A correction device (8) is installed on the frame (1) at the output end of the film buffer mechanism (7). The position of the film is corrected by adjusting the guide roller angle of the correction device (8).

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