Digital printing film winding structure

Abstract

This invention relates to a digital printing film winding structure, belonging to the field of film winding technology in digital printing. A rotatable support is installed on the body of the digital printing machine. One end of the support is connected to the machine body, and an adjustment device is installed on the other end of the support. A roller traction unit in the adjustment device is rotatably mounted on the other end of the support. The roller of the roller traction unit is in contact with the winding shaft. During film winding, the telescopic part is first adjusted so that it drives the pressure roller to press the film on the winding shaft. The gravity of the roller of the roller traction unit then acts on the winding shaft, pressing it firmly. When the roller traction unit drives the winding shaft to rotate, the center speed of the winding shaft remains constant, equivalent to uniform circular motion, with a constant linear velocity. As the film is wound, the diameter of the master roll increases, causing the rotational speed of the winding shaft to slow down. This solves the problem of tension sensor damage or malfunction when used in areas with high humidity.

Description

Technical Field

[0001] This invention belongs to the field of film winding technology in digital printing, and specifically relates to a digital printing film winding structure. Background Technology

[0002] Film is a thin, soft, and transparent sheet. When packaging different products, the surface of the film needs to be printed. Using printed plastic film for product packaging can not only improve product recognition but also enhance the product's aesthetics. Currently, digital printing is commonly used for film printing, and the film can be automatically rolled up after printing, improving printing efficiency.

[0003] Currently, the film winding structure after digital printing is usually set on the body of the digital printing machine. The film is wound onto the winding shaft by a motor. During winding, as the diameter of the master roll increases, if the speed of the winding shaft remains constant, the winding tension increases, resulting in a loose inner layer and a tight outer layer. The outer film wrinkles the inner film. To solve this problem, a winding shaft control system combined with a tension sensor to control the motor's rotation speed is typically used. However, in areas with high humidity, the humidity can affect the tension sensor, easily causing damage or malfunction. Once the tension sensor is damaged or malfunctions, subsequent film rolls will be loose inside and tight outside, with the outer film wrinkling the inner film, ultimately affecting the entire film roll's usability. Therefore, a new digital printing film winding structure is proposed. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a digital printing film winding structure. This structure solves the problem that in areas with high humidity, excessive ambient humidity can easily damage or malfunction the tension sensor. Once the tension sensor is damaged or malfunctions, the film roll will be loose inside and tight outside during subsequent winding, causing the outer film to wrinkle the inner film, ultimately affecting the use of the entire film roll.

[0005] The objective of this invention can be achieved through the following technical solution: a digital printing film winding structure, comprising a winding shaft, a support, and an adjusting device. Both ends of the winding shaft are rotatably mounted on the body of a digital printing machine. One end of the support is rotatably mounted on the body of the digital printing machine. The adjusting device is mounted on the other end of the support and is used to adjust the winding speed of the winding shaft. The adjusting device includes a roller traction section, a pressure roller for pressing the film, and a telescopic section connected to the pressure roller. The roller traction section is rotatably mounted on the other end of the support, and the roller of the roller traction section is in contact with the winding shaft. The telescopic section is mounted on the support on one side of the roller traction section. The telescopic section drives the pressure roller to press the film on the winding shaft. The roller of the roller traction section drives the winding shaft to rotate through friction with the winding shaft, thereby automatically adjusting the speed of the winding shaft.

[0006] As a further embodiment of the present invention, the telescopic parts are disposed at both ends of the paper pressure roller, and the two telescopic parts extend and retract synchronously.

[0007] As a further embodiment of the present invention, a paper guide roller for winding paper is provided on the bracket on the other side of the roller traction part.

[0008] As a further embodiment of the present invention, the roller traction section is positioned higher than the winding shaft.

[0009] As a further embodiment of the present invention, the roller traction unit includes a traction roller rotatably mounted on a support, a speed reducer, and a motor, wherein the traction roller is driven by the motor and the motor is connected to the speed reducer.

[0010] As a further embodiment of the present invention, the traction roller is made of solid silicon steel.

[0011] As a further embodiment of the present invention, one end of the bracket is rotatably mounted on the body of the digital printing machine via a damping mechanism. The damping mechanism is used to balance the pressure of the roller traction unit on the film on the take-up shaft. The damping mechanism includes a double rack gear transmission unit, a gear ring drive unit mounted on the bracket, and a spring unit. The two ends of the spring unit are respectively connected to one rack of the gear ring drive unit and one rack of the double rack gear transmission unit. The gear ring drive unit meshes with the other rack of the double rack gear transmission unit. The film on the take-up shaft drives the gear ring drive unit to rotate via a lifting bracket. The gear ring drive unit drives the double rack gear transmission unit to move via the spring unit, so that the double rack gear transmission unit balances the pressure of the film on the take-up shaft.

[0012] As a further embodiment of the present invention, the spring part and the gear ring drive part are connected by a connecting rod, the connecting rod being located on the gear ring drive part below the bracket, and the connecting rod being located on a quarter arc below the gear ring of the gear ring drive part.

[0013] As a further embodiment of the present invention, the double rack gear transmission unit includes a gear and two racks respectively meshing on both sides of the gear, and both racks are slidably connected to the body of the digital printing machine.

[0014] As a further embodiment of the present invention, the diameter of the gear ring of the gear ring drive part is smaller than the diameter of the gear.

[0015] The beneficial effects of this invention are as follows:

[0016] By installing a rotatable bracket on the body of a digital printing machine, connecting one end of the bracket to the machine body, and installing an adjustment device on the other end of the bracket, the roller traction part in the adjustment device is rotatably mounted on the other end of the bracket. The roller of the roller traction part is in contact with the take-up shaft. When winding the film, the telescopic part is first adjusted so that the telescopic part drives the pressure roller to press the film on the take-up shaft. The gravity of the roller of the roller traction part can then act on the take-up shaft, pressing it tightly. When the roller traction part drives the take-up shaft to rotate, the center speed of the take-up shaft is constant, which is equivalent to uniform circular motion, and the linear velocity remains unchanged. As the film is wound, the diameter of the master roll increases, which slows down the speed of the take-up shaft. At the same time, this application uses an adjustment device to replace the take-up shaft control system and uses a tension sensor to control the rotation speed of the motor. It can also avoid the problem of increasing winding tension, which leads to the film roll being loose inside and tight outside, and the outer film wrinkling the inner film. This solves the problem that when used in high humidity areas, the tension sensor is easily damaged or malfunctions, which ultimately affects the use of the entire film roll. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the roller traction section structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the film winding process of the present invention;

[0021] Figure 4 This is a schematic diagram of the damping mechanism structure of the present invention.

[0022] Explanation of key component symbols:

[0023] In the diagram: 1. Machine body; 2. Support frame; 3. Adjustment device; 31. Roller traction unit; 32. Paper pressure roller; 33. Telescopic unit; 4. Guide roller; 5. Damping mechanism; 51. Double rack and pinion transmission unit; 52. Gear ring drive unit; 53. Spring unit; 6. Connecting rod; 7. Film; 8. Rewinding shaft. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0025] Please see Figure 1-4This embodiment provides a digital printing film winding structure, including a winding shaft 8, a support 2, and an adjusting device 3. Both ends of the winding shaft 8 are rotatably mounted on the body 1 of a digital printing machine. One end of the support 2 is rotatably mounted on the body 1 of the digital printing machine. The adjusting device 3 is mounted on the other end of the support 2 and is used to adjust the winding speed of the winding shaft 8. Besides the winding shaft 8, the body 1 of the digital printing machine also contains other components. Since this application only optimizes the structure at the winding location, not all other structures are shown. The adjusting device 3 includes a roller traction part 31, a pressure roller 32 for pressing the film 7, and a... The pressure roller 32 is connected to the telescopic part 33, and the roller traction part 31 is rotatably mounted on the other end of the bracket 2. The roller of the roller traction part 31 is in contact with the take-up shaft 8, so the weight of the roller of the roller traction part 31 can act on the take-up shaft 8 to press it tightly. The telescopic part 33 is mounted on the bracket 2 on one side of the roller traction part 31. The telescopic part 33 drives the pressure roller 32 to press the film 7 on the take-up shaft 8 tightly. The telescopic part 33 is a cylinder, and the degree of pressing between the pressure roller 32 and the film 7 on the take-up shaft 8 can be controlled by controlling the extension and retraction of the cylinder. The roller of the roller traction part 31 drives the take-up shaft 8 to rotate through friction with the take-up shaft 8, so that the take-up is wound up. The winding shaft 8 automatically adjusts its speed. A film 7 is sandwiched between the winding shaft 8 and the roller traction unit 31. However, due to the material of the film 7 and the force between the film 7 and the winding shaft 8, the rollers of the roller traction unit 31 can continuously rotate the winding shaft 8. There is no slippage between the winding shaft 8 and the film 7, or between the film 7 and the roller traction unit 31. When the roller traction unit 31 drives the winding shaft 8 to rotate, the center speed of the winding shaft 8 remains constant, equivalent to uniform circular motion, with a constant linear velocity. As the film 7 is wound up, the diameter of the master roll increases, causing the speed of the winding shaft 8 to slow down, thus preventing an increase in winding tension. This resulted in the film roll being loose inside and tight outside, with the outer film wrinkling the inner film. The improved power source here comes from the roller traction unit 31, which acts as the active power source. The original winding shaft 8 rotated by the friction between the roller of the roller traction unit 31 and the winding shaft 8. Now, the winding shaft 8 becomes a driven motion, and it no longer needs a motor. The motor on the winding shaft 8 can be de-energized. When not winding the film 7, the adjustment device 3 and the bracket 2 can be removed, and the motor on the winding shaft 8 can then be energized to wind ordinary film, making the winding structure of this digital printing machine more compatible.

[0026] Currently, the film winding structure for digital printing is generally set on the body 1 of the digital printing machine, and then a winding method is used, that is, the motor drives the winding shaft 8 to rotate to wind the film 7 onto the winding shaft 8. However, when the film 7 is wound, as the diameter of the master roll increases, if the speed of the motor driving the winding shaft 8 remains unchanged, it will cause an increase in winding tension, resulting in the film roll being loose inside and tight outside. The outer film will wrinkle the inner film. To solve this problem, the winding shaft 8 control system is usually used in conjunction with a tension sensor to control the rotation speed of the motor. However, when used in areas with high humidity, the humidity of the environment will affect the use of the tension sensor, which is prone to damage or failure. Once the tension sensor is damaged or malfunctions, the film rolls that are subsequently wound will be loose inside and tight outside, and the outer film will wrinkle the inner film, ultimately affecting the use of the entire film roll.

[0027] To solve the above problems, in this embodiment, a rotatable bracket 2 is installed on the body 1 of the digital printing machine, and one end of the bracket 2 is connected to the body 1. An adjustment device 3 is installed on the other end of the bracket 2. The roller traction part 31 in the adjustment device 3 is rotatably installed on the other end of the bracket 2. The roller of the roller traction part 31 is in contact with the take-up shaft 8. When the film 7 is being wound up, the telescopic part 33 is first adjusted so that the telescopic part 33 drives the pressure roller 32 to press the film 7 on the take-up shaft 8. The gravity of the roller of the roller traction part 31 can then act on the take-up shaft 8, pressing the take-up shaft 8. When the roller traction part 31 drives the take-up shaft 8 to rotate, the center speed of the take-up shaft 8 is constant, which is equivalent to making a uniform circular motion. During operation, the linear velocity remains constant. As the film 7 is wound up, the diameter of the master roll increases, causing the rotational speed of the winding shaft 8 to slow down. Simultaneously, this application replaces the winding shaft 8 control system with an adjustment device 3, which, in conjunction with a tension sensor, controls the motor's rotational speed. This also avoids the problem of increasing winding tension, which leads to a loose inner layer and a tight outer layer, causing the outer film 7 to wrinkle the inner film 7. This solves the problem that in humid areas, the humidity can affect the tension sensor's performance, potentially causing damage or malfunction. If the tension sensor is damaged or malfunctions, subsequent windings will result in a loose inner layer and a tight outer layer, with the outer film wrinkling the inner film, ultimately affecting the overall use of the film roll.

[0028] During the winding of the film 7, the pressure roller 32 needs to press the film 7 firmly. However, the winding shaft 8 vibrates when it rotates. This vibration is transmitted to the pressure roller 32, which can easily cause the pressure between the pressure roller 32 and the film 7 to be uneven at every point. Once the pressure varies, the winding quality of the film 7 will be poor. The points where the pressure between the pressure roller 32 and the film 7 is most likely to be uneven due to vibration are at both ends of the pressure roller 32. In one embodiment, telescopic parts 33 are provided at both ends of the pressure roller 32, and the two telescopic parts 33 extend and retract synchronously. By providing two synchronously extending and retracting telescopic parts 33 at both ends of the pressure roller 32, the pressure roller 32 and the film 7 can be pressed together. Even when the winding shaft 8 vibrates during rotation, the movement of the pressure roller 32 is restricted by the telescopic parts 33, so that the pressure between the pressure roller 32 and the film 7 is the same at every point, thus ensuring the winding quality of the film 7.

[0029] In addition, in actual use, when the film 7 is wound up, in addition to the winding shaft 8, a paper guide roller 4 is also provided to facilitate paper guidance. However, after the addition of the bracket 2 and the adjustment device 3, paper feeding interference needs to be further considered. In this regard, in one embodiment, a paper guide roller 4 for winding paper is installed on the bracket 2 on the other side of the roller traction part 31. This paper guide roller 4 is added on the basis of the original paper guide roller 4 and does not conflict with the original paper guide roller 4. Moreover, this paper guide roller 4 is designed to avoid paper feeding interference after the addition of the bracket 2 and the adjustment device 3.

[0030] Since the take-up shaft 8 is pressed down by the gravity of the rollers in the roller traction unit 31, and the roller traction unit 31 acts as the active drive to rotate the take-up shaft 8, there are certain requirements for the setting position of the roller traction unit 31. It needs to ensure that the roller traction unit 31 can drive the take-up shaft 8 to rotate without causing uneven winding of the film 7 due to improper positioning. Therefore, in one embodiment, the roller traction unit 31 is positioned higher than the take-up shaft 8. During winding, considering that the film 7 will be wound layer by layer on the take-up shaft 8, the actual... The film 7 and the take-up shaft 8 form a circle. Taking the digital printing machine body 1 horizontally placed on the ground as a reference, the circle formed by the film 7 and the take-up shaft 8 is divided into upper and lower parts. Therefore, the roller traction unit 31 needs to be positioned higher than the take-up shaft 8 and located at the upper quarter circle position. If the roller traction unit 31 is equal to or lower than the take-up shaft 8 position, the film 7 at the upper quarter circle position will be uneven. This is because the film 7 actually starts winding around the take-up shaft 8 from the upper part of the circle. Figure 3 As shown.

[0031] In addition, as the diameter of the master roll increases, the weight of the entire take-up shaft 8 increases when the roller traction unit 31 drives the take-up shaft 8 to rotate. This increases the resistance of the roller traction unit 31 in driving the take-up shaft 8 to rotate, causing the motor speed to slow down. However, considering that the take-up shaft 8 can wind up both small and large films 7, a slower speed is needed when winding up large films 7 to avoid tension issues affecting the winding quality. Therefore, in one embodiment, the roller traction unit 31 includes a traction roller rotatably mounted on the support 2, a reducer, and a motor. The traction roller is driven by the motor, which is connected to the reducer. For ordinary film 7 winding, no adjustment of the reducer is required. However, when encountering films 7 being wound up by the take-up shaft 8... When there are many layers of film 7 and many turns of film 7 being wound, the speed reducer can be turned on to better reduce the speed of the motor, thereby avoiding winding quality problems caused by tension of film 7. In addition, in order to better avoid paper feeding interference and improve the winding quality of film 7, a wrap angle is set at the traction roller. When the traction roller rotates, it initially contacts the winding shaft 8. After the film 7 is wound, the traction roller contacts the film 7. Therefore, it is necessary to ensure that the traction roller can press the film 7 tightly without affecting it. Therefore, the traction roller here is made of solid silicon steel. The surface of silicon steel is flat, which avoids affecting the film 7. The purpose of solidity is to increase the weight of the traction roller so that the traction roller can press the film 7 tightly.

[0032] It is worth mentioning that when the traction roller squeezes the film 7 on the take-up shaft 8 to wind the film 7, the take-up shaft 8 vibrates. As more film 7 is wound onto the take-up shaft 8, the diameter of the master roll gradually increases, causing the support 2 to rotate upward along the machine body 1. As the support 2 rotates upward, the angle between the support 2 and the machine body 1 changes, which leads to an increase in the squeezing force of the traction roller on the film 7. This may also cause the film 7 to become loose on the inside and tight on the outside due to excessive squeezing force. To solve this problem, in one embodiment, one end of the support 2 is rotatably mounted on the machine body 1 of the digital printing machine through a damping mechanism 5. The damping mechanism 5 is used to balance the pressure of the roller traction part 31 on the film 7 on the take-up shaft 8. The mechanism 5 includes a double rack gear transmission part 51, a gear ring drive part 52 mounted on the support 2, and a spring part 53. The two ends of the spring part 53 are respectively connected to one rack of the gear ring drive part 52 and one rack of the double rack gear transmission part 51. The gear ring drive part 52 meshes with the other rack of the double rack gear transmission part 51. The film 7 on the take-up shaft 8 drives the gear ring drive part 52 to rotate via the lifting support 2. The gear ring drive part 52 drives the double rack gear transmission part 51 to move via the spring part 53, thus balancing the pressure of the film 7 on the take-up shaft 8. The double rack gear transmission part 51 includes a gear and two racks respectively meshing on both sides of the gear. Both racks are engaged with the mechanism of the digital printing machine. The body 1 is slidably connected, and the gear is fixedly connected to the bracket 2. The gear and the bracket 2 rotate on the same shaft. The spring part 53 is connected to the gear ring drive part 52 by a connecting rod 6. The connecting rod 6 is located on the gear ring drive part 52 below the bracket 2, and the connecting rod 6 is located on a quarter-circle arc below the gear ring of the gear ring drive part 52. The gear ring drive part 52 includes a gear ring and a rotating shaft. The rotating shaft is fixed to the body 1, and the gear ring is rotatably sleeved on the rotating shaft. The connecting rod 6 is fixedly set on the gear ring, and the connecting rod 6 is not on the same plane as the gear ring to avoid interference with the teeth on the gear ring. When the diameter of the master roll gradually increases, the bracket 2 and the gear rotate counterclockwise. The gear drives the rack on the left to move downward, driving the rack on the right to move downward. The rack on one side moves upward, while the rack on the left side drives the gear ring drive unit 52 to rotate counterclockwise. The gear ring drives the connecting rod 6 to compress the spring. The spring compresses and pushes the rack on the right side to slide upward, which causes the adjusting device 3 on the bracket 2 to be subjected to an upward force. That is, the more the bracket 2 rotates counterclockwise, the greater the spring compression force, and the greater the upward force on the adjusting device 3. This balances the pressure on the film 7 on the take-up shaft 8 and prevents the angle between the bracket 2 and the machine body 1 from changing as the bracket 2 rotates upward, which would cause the traction roller to compress the film 7 more, and might also cause the film 7 to be too tightly compressed on the outside and loose on the inside. Here, counterclockwise, left, and right are all based on... Figure 4To make it easier to see how it moves, we use counterclockwise, left, and right directions to describe it. In addition, to ensure better compression of the spring, the diameter of the toothed ring of the toothed ring drive part 52 is designed to be smaller than the diameter of the gear. At the same time, the connecting rod 6 is located on the quarter circle arc below the toothed ring of the toothed ring drive part 52, which can ensure that the spring can be better compressed and lifted upward when the toothed ring rotates.

[0033] Working principle and usage process of this invention:

[0034] In use, a rotatable bracket 2 is set on the body 1 of the digital printing machine, and one end of the bracket 2 is connected to the body 1. An adjustment device 3 is set on the other end of the bracket 2. The roller traction part 31 in the adjustment device 3 is rotatably set on the other end of the bracket 2. The roller of the roller traction part 31 is in contact with the take-up shaft 8. When the film 7 is being wound up, the telescopic part 33 is first adjusted so that the telescopic part 33 drives the pressure roller 32 to press the film 7 on the take-up shaft 8. The gravity of the roller of the roller traction part 31 can then act on the take-up shaft 8 to press it up. When the roller traction part 31 drives the take-up shaft 8 to rotate, the center speed of the take-up shaft 8 is constant, which is equivalent to uniform circular motion. The linear speed remains unchanged. As the film 7 is wound up, the diameter of the master roll increases, which will cause the speed of the take-up shaft 8 to slow down.

[0035] As the diameter of the master roll gradually increases, the bracket 2 and the gear rotate counterclockwise. The gear drives the left rack to move downward and the right rack to move upward. The left rack drives the gear ring of the gear ring drive unit 52 to rotate counterclockwise. The gear ring drives the connecting rod 6 to compress the spring. The spring compresses and pushes the right rack to slide upward, which causes the adjustment device 3 on the bracket 2 to be subjected to an upward force. That is, the more the bracket 2 rotates counterclockwise, the greater the spring compression force, and the greater the upward force on the adjustment device 3, thus balancing the pressure of the film 7 on the take-up shaft 8.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A digital printing film winding structure, characterized in that, The device includes a take-up shaft, a bracket, and an adjustment device. Both ends of the take-up shaft are rotatably mounted on the body of the digital printing machine. One end of the bracket is rotatably mounted on the body of the digital printing machine. The adjustment device is located at the other end of the bracket and is used to adjust the take-up speed of the take-up shaft. The adjustment device includes a roller traction section, a pressure roller for pressing the film, and a telescopic section connected to the pressure roller. The roller traction section is rotatably mounted on the other end of the bracket, and the roller of the roller traction section is in contact with the take-up shaft. The telescopic section is located on the bracket on one side of the roller traction section. The telescopic section drives the pressure roller to press the film on the take-up shaft tightly. The roller of the roller traction section drives the take-up shaft to rotate through friction with the take-up shaft, causing the take-up shaft to automatically adjust its speed. One end of the bracket is rotatably mounted on the body of the digital printing machine via a damping mechanism. The damping mechanism is used to balance the pressure of the roller traction unit on the film on the take-up shaft. The damping mechanism includes a double rack gear transmission unit, a gear ring drive unit mounted on the bracket, and a spring unit. The two ends of the spring unit are respectively connected to one rack of the gear ring drive unit and one rack of the double rack gear transmission unit. The gear ring drive unit meshes with the other rack of the double rack gear transmission unit. The film on the take-up shaft drives the gear ring drive unit to rotate via the lifting bracket. The gear ring drive unit drives the double rack gear transmission unit to move via the spring unit, so that the double rack gear transmission unit balances the pressure of the film on the take-up shaft. The spring part and the gear ring drive part are connected by a connecting rod. The connecting rod is located on the gear ring drive part below the bracket, and the connecting rod is located on a quarter arc below the gear ring of the gear ring drive part. The double rack and pinion transmission unit includes a gear and two racks respectively meshing on both sides of the gear, and both racks are slidably connected to the body of the digital printing machine.

2. The digital printing film winding structure according to claim 1, characterized in that, The telescopic parts are located at both ends of the paper pressure roller, and the two telescopic parts extend and retract synchronously.

3. The digital printing film winding structure according to claim 1, characterized in that, A paper guide roller for winding paper is provided on the bracket on the other side of the roller traction section.

4. The digital printing film winding structure according to claim 1, characterized in that, The roller traction section is positioned higher than the winding shaft.

5. The digital printing film winding structure according to claim 1, characterized in that, The roller traction unit includes a traction roller rotatably mounted on a support, a speed reducer, and a motor. The traction roller is driven by the motor, and the motor is connected to the speed reducer.

6. The digital printing film winding structure according to claim 5, characterized in that, The traction roller is made of solid silicon steel.

7. The digital printing film winding structure according to claim 1, characterized in that, The diameter of the gear ring in the gear ring drive unit is smaller than the diameter of the gear.

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