Optical diffusion film pre-shrinking mechanism

Abstract

This invention discloses an optical diffusion film pre-shrinking mechanism, which includes a frame, two stretching assemblies, and a baking mechanism. The two stretching assemblies are disposed on the frame and spaced apart, forming a pre-shrinking station between them. After passing through the pre-shrinking station, the optical diffusion film enters a coating machine. The two stretching assemblies respectively clamp both sides of the optical diffusion film and stretch it outward. The baking mechanism is disposed above the pre-shrinking station and is used to bake the optical diffusion film after passing through the pre-shrinking station. This invention aims to reduce the heat shrinkage rate of optical diffusion films applied to electronic products, thereby improving the quality of related products.

Description

Technical Field

[0001] This invention relates to the field of thin film pre-shrinking technology, and in particular to an optical diffusion film pre-shrinking mechanism. Background Technology

[0002] PET film is often coated or attached to the surface of electronic products. For example, optical diffusion film is used in devices that require light sources, such as LCD displays, advertising light boxes, and lighting fixtures. When electronic products such as LCD screens are working, they will heat up. Under high temperature conditions, the optical diffusion film may shrink. Since the thermal deformation rate of the electronic product material is inconsistent with that of the optical diffusion film, it may cause quality problems such as deformation and misalignment of electronic products with optical diffusion film, affecting the quality of the product. Summary of the Invention

[0003] The main objective of this invention is to provide an optical diffusion film pre-shrinkage mechanism, which aims to reduce the thermal shrinkage rate of optical diffusion films applied to electronic products, thereby improving the quality of related products.

[0004] To achieve the above objectives, the optical diffusion film pre-shrinkage mechanism proposed in this invention includes:

[0005] frame;

[0006] Two stretching assemblies are mounted on the frame and spaced apart, forming a pre-shrinking station between them. The optical diffusion film enters the coating machine after passing through the pre-shrinking station. The two stretching assemblies respectively clamp both sides of the optical diffusion film and stretch it outwards.

[0007] A baking mechanism is provided above the pre-shrinking station and is used to bake the optical diffusion film that has passed through the pre-shrinking station.

[0008] In one embodiment of the present invention, the stretching assembly includes:

[0009] A conveying structure, wherein the conveying structure is disposed on the frame;

[0010] Two clamping structures are located above and below the optical diffusion film, respectively. The two clamping structures are connected to the conveying structure. The conveying structure is used to drive the two clamping structures to move toward the coating machine. The two clamping structures are used to clamp the optical diffusion film and move it away from the other stretching component.

[0011] In one embodiment of the present invention, the conveying structure includes two conveying assemblies, each of the clamping structures being drively connected to one of the conveying assemblies, and the conveying assembly includes:

[0012] A drive unit, the drive unit being disposed on the frame;

[0013] Two conveyor wheels are arranged sequentially along the conveying direction of the pre-shrinking mechanism and are rotatably connected to the frame. The central axis of each conveyor wheel is vertically arranged, and the driving component drives one of the conveyor wheels to rotate.

[0014] A conveyor belt, which is fitted onto two conveyor wheels, and a clamping structure is drivenly connected to the conveyor belt.

[0015] In one embodiment of the present invention, the clamping structure includes a plurality of swing structures, the plurality of swing structures being connected to the conveyor belt and arranged sequentially at intervals along the outer wall of the conveyor belt, the swing structures including:

[0016] Two fixing blocks, the two fixing blocks protruding from the outer wall of the conveyor belt;

[0017] A rotating shaft is disposed between the two fixed blocks and is rotatably connected to the two fixed blocks. The rotating shaft extends along the conveying direction of the conveyor belt.

[0018] A swing bar, which is connected to the rotating shaft;

[0019] The swing bars in the upper clamping structure are arranged in a one-to-one correspondence with the swing bars in the lower clamping structure. When the two swing bars swing in a direction away from the pre-shrinking station, they clamp the edge of the optical diffusion film and apply a pulling force outward.

[0020] In one embodiment of the present invention, the swing bar includes a stretching section, a driving section and a fixing section. The stretching section is disposed close to the optical diffusion film, the driving section is disposed away from the optical diffusion film, and the fixing section is located between the stretching section and the driving section and is rotatably connected to the rotating shaft. The swing bar swings about the rotating shaft as the center.

[0021] In the pair of swing bars, when the upper stretching section and the lower stretching section swing outward synchronously, they clamp and stretch the optical diffusion film.

[0022] In one embodiment of the present invention, the swing structure further includes a torsion spring, which is sleeved on the rotating shaft and connected at both ends to the fixed block and the fixed segment, so that the swing bar has an outward swinging force.

[0023] In one embodiment of the present invention, the clamping structure further includes a first opening mechanism and a second opening mechanism;

[0024] The first opening mechanism is located at the entrance end of the pre-shrinking station and is used to drive the pair of swing bars to open so as to hold the optical diffusion film.

[0025] The second opening mechanism is located at the exit end of the pre-shrinking station and is used to drive the pair of swing bars to open to release the optical diffusion film.

[0026] In one embodiment of the present invention, the first opening mechanism is provided with a first abutting surface and a first inclined surface. The first inclined surface is located at the end of the first opening mechanism away from the second opening mechanism and is disposed towards the driving section. The first abutting surface is the side of the first opening mechanism away from the pre-shrinking station. During the process of the swing bar moving towards the first opening mechanism with the conveyor belt, the first inclined surface contacts the driving section of the swing bar to drive the driving section to swing away from the pre-shrinking station. When the swing bar moves with the conveyor belt and comes above the optical diffusion film, the first abutting surface releases the driving section of the swing bar so that the stretching section of the swing bar swings outward and abuts the optical diffusion film.

[0027] The second opening mechanism is provided with a second abutting surface and a second inclined surface. The second inclined surface is located at one end of the second opening mechanism near the first opening mechanism and is positioned towards the drive section. The second abutting surface is on the side of the second opening mechanism away from the pre-shrinking station. During the process of the swing bar moving from the first opening mechanism toward the second opening mechanism with the conveyor belt, the second inclined surface contacts the drive section of the swing bar to drive the drive section to swing away from the pre-shrinking station. When the swing bar moves with the conveyor belt and leaves the optical diffusion film, the second abutting surface releases the drive section of the swing bar so that the stretching section of the swing bar swings outward and detaches from the optical diffusion film.

[0028] In one embodiment of the present invention, the swing bar further includes a rubber block disposed at the end of the stretching section for contacting the optical diffusion film.

[0029] In one embodiment of the present invention, the inner edge and / or outer edge of the rubber block facing away from the end face of the fixed section are provided with chamfers.

[0030] The optical diffusion film pre-shrinkage mechanism proposed in this invention includes two stretching components, which are spaced apart to form a pre-shrinkage station. After passing through the pre-shrinkage station, the optical diffusion film enters the coating machine. During this process, the two stretching components respectively clamp and stretch both sides of the optical diffusion film outward, and are further supplemented by baking, so that the optical diffusion film has already completed the pre-shrinkage process well before entering the coating machine. When the optical diffusion film obtained in this way is then applied to electronic products, the shrinkage rate will be effectively reduced, thereby improving the quality of the related products. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of another embodiment of the present invention;

[0034] Figure 3 This is a magnified view of point A;

[0035] Figure 4 This is a magnified view of point B;

[0036] Figure 5 This is a schematic diagram of the oscillating structure.

[0037] Explanation of icon numbers:

[0038]

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0044] This invention proposes a pre-shrinkage mechanism 1000 for an optical diffusion film 60.

[0045] Reference Figures 1 to 5 The optical diffusion film 60 pre-shrinking mechanism 1000 of the present invention includes a frame 10, two stretching components 20, and a baking mechanism 30. The two stretching components 20 are disposed on the frame 10 and are spaced apart, forming a pre-shrinking station 21 between the two stretching components 20. After passing through the pre-shrinking station 21, the optical diffusion film 60 enters the coating machine 2000. The two stretching components 20 respectively clamp the two sides of the optical diffusion film 60 and stretch them outward. The baking mechanism 30 is disposed above the pre-shrinking station 21 and is used to bake the optical diffusion film 60 after passing through the pre-shrinking station 21.

[0046] In one embodiment of the present invention, after the optical diffusion film 60 is conveyed to the pre-shrinking station 21 by the conveying device (not shown), it stops moving. Then, two stretching components 20 clamp the two sides of the optical diffusion film 60 and stretch it outwards. Simultaneously, the baking mechanism 30 heats and bakes the optical diffusion film 60. Stretching and baking the optical diffusion film 60 allows it to pre-shrink before being coated onto electronic products. Because it has undergone pre-heat shrinkage, the thermal deformation rate of the optical diffusion film 60 is reduced, and it will no longer shrink or shrink less when exposed to high temperatures. This ensures that the electronic products operate stably under high-temperature conditions after the optical diffusion film 60 is applied.

[0047] The optical diffusion film 60 pre-shrinking mechanism 1000 also includes two conveying rollers and a baking mechanism 30. The two conveying rollers are located at both ends of the pre-shrinking station 21, and the optical diffusion film 60 is located on the upper surface of the two conveying rollers. The conveying rollers are used to guide and convey the optical diffusion film 60. The conveying rollers can be undriven rollers or rotating rods with their own driving force. The baking mechanism 30 is located above the pre-shrinking station 21 to bake and heat the optical diffusion film 60 during the stretching process.

[0048] The optical diffusion film 60, which has been processed by the optical diffusion film 60 pre-shrinking mechanism 1000, can be directly guided to the coating machine 2000 for coating processing via the conveyor roller, thus avoiding contamination or scratches on the processed optical diffusion film 60. Furthermore, since the optical diffusion film 60 has already been baked and heated, the baking and heating process of the coating machine 2000 can be eliminated, simplifying the structure of the coating machine 2000.

[0049] In one embodiment of the present invention, the stretching assembly 20 includes a conveying structure 22 and two clamping structures 23. The conveying structure 22 is disposed on the frame 10. The two clamping structures 23 are respectively located above and below the optical diffusion film 60. The two clamping structures 23 are connected to the conveying structure 22 in a driving manner. The conveying structure 22 is used to drive the two clamping structures 23 to move toward the direction close to the coating machine 2000. The two clamping structures 23 are used to clamp the optical diffusion film 60 and move it toward the direction away from the other stretching assembly 20.

[0050] The two clamping structures 23 swing synchronously toward the optical diffusion film 60 to clamp the optical diffusion film 60 and stretch the optical diffusion film 60 outward along the width direction. During this process, the conveying structure 22 conveys the clamping structure 23 to move, thus simultaneously completing the movement, clamping and stretching of the optical diffusion film 60.

[0051] In one embodiment of the present invention, the conveying structure 22 includes two conveying components 221, and each clamping structure 23 is tractively connected to one conveying component 221. The conveying component 221 includes a driving member 2211, two conveying wheels 2212 and a conveyor belt 2213. The driving member 2211 is disposed on the frame 10. The two conveying wheels 2212 are arranged sequentially along the conveying direction of the pre-shrinking mechanism and are rotatably connected to the frame 10. The central axis of the conveying wheel 2212 is vertically arranged. The driving member 2211 drives one of the conveying wheels 2212 to rotate. The conveyor belt 2213 is sleeved on the two conveying wheels 2212, and the clamping structure 23 is tractively connected to the conveyor belt 2213.

[0052] The use of conveyor wheels 2212 and conveyor belts 2213 ensures the stability of the clamping structure 23 and further ensures that the baking and heating time of the optical diffusion film 60 remains consistent, thus guaranteeing the quality of the pre-shrinking process.

[0053] In one embodiment of the present invention, the clamping structure 23 includes a plurality of swing structures 231, which are connected to the conveyor belt 2213 and are arranged sequentially at intervals along the outer wall of the conveyor belt 2213. Each swing structure 231 includes two fixed blocks 2311, a rotating shaft 2312, and a swing bar 2313. The two fixed blocks 2311 protrude from the outer wall of the conveyor belt 2213. The rotating shaft 2312 is disposed between the two fixed blocks 2311 and is rotatably connected to the two fixed blocks 2311. The rotating shaft 2312 extends along the conveying direction of the conveyor belt 2213. The swing bar 2313 is connected to the rotating shaft 2312.

[0054] The swing bar 2313 in the upper clamping structure 23 is arranged in a one-to-one correspondence with the swing bar 2313 in the lower clamping structure 23. When the two swing bars 2313 swing in the direction away from the pre-shrinking station 21, they clamp the edge of the optical diffusion film 60 and apply a pulling force outward.

[0055] When the two swing bars 2313 swing in the direction away from the pre-shrinking station 21, the swing bars 2313 in the upper clamping structure 23 and the swing bars 2313 in the lower clamping structure 23 approach each other and clamp the optical diffusion film 60, while moving outward to stretch the optical diffusion film 60.

[0056] In one embodiment of the present invention, the swing bar 2313 includes a stretching section 2314, a driving section 2315 and a fixing section 2316. The stretching section 2314 is disposed close to the optical diffusion film 60, the driving section 2315 is disposed away from the optical diffusion film 60, and the fixing section 2316 is located between the stretching section 2314 and the driving section 2315 and is rotatably connected to the rotating shaft 2312. The swing bar 2313 swings around the rotating shaft 2312 as the center.

[0057] When the drive section 2315 swings away from the pre-shrinking station 21, the stretching section 2314 swings towards the pre-shrinking station 21. At this time, the distance between the upper and lower stretching sections 2314 becomes greater, which facilitates the optical diffusion film 60 to enter the pre-shrinking station 21. Then the swing bar 2313 resets. During the reset process, the drive section 2315 swings away from the pre-shrinking station 21, first clamping the optical diffusion film 60 and then continuing to swing, holding the optical diffusion film 60 and moving it away from the pre-shrinking station 21 to complete the stretching.

[0058] In one embodiment of the present invention, the swing structure 231 further includes a torsion spring 2318, which is sleeved on the rotating shaft 2312 and connected at both ends to the fixed block 2311 and the fixed segment 2316, respectively, so that the swing bar 2313 has an outward swinging force. The torsion spring 2318 reduces the power requirement for the swing bar 2313 to reset, thereby reducing energy consumption.

[0059] In one embodiment of the present invention, the clamping structure 23 further includes a first opening mechanism 232 and a second opening mechanism 233; the first opening mechanism 232 is disposed at the entrance end of the pre-shrinking station 21 and is used to drive the pair of swing bars 2313 to open to clamp the optical diffusion film 60; the second opening mechanism 233 is disposed at the exit end of the pre-shrinking station 21 and is used to drive the pair of swing bars 2313 to open to release the optical diffusion film 60. Both the first opening mechanism 232 and the second opening mechanism 233 are wedge-shaped bars.

[0060] The first opening mechanism 232 is used to open the pair of swing bars 2313 before the optical diffusion film 60 enters the pre-shrinking station 21. When the pair of swing bars 2313 are driven to reset by the reset spring, they clamp and stretch the optical diffusion film 60. The second opening mechanism 233 is used to open the pair of swing bars 2313 before the optical diffusion film 60 moves to the point of leaving the pre-shrinking station 21, so that the optical diffusion film 60 can smoothly leave the pre-shrinking station 21, avoiding tearing, pulling and other phenomena on the ergonomic diffusion film.

[0061] The first opening mechanism 232 is provided with a first abutting surface 2322 and a first inclined surface 2321. The first inclined surface 2321 is located at the end of the first opening mechanism 232 away from the second opening mechanism 233 and is positioned towards the drive section 2315. The first abutting surface 2322 is the side of the first opening mechanism 232 away from the pre-shrinking station 21. During the movement of the swing bar 2313 towards the first opening mechanism 232 with the conveyor belt 2213, the first inclined surface 2321 contacts the drive section 2315 of the swing bar 2313 to drive the drive section 2315 to swing away from the pre-shrinking station 21. When the swing bar 2313 moves with the conveyor belt 2213 and comes above the optical diffusion film 60, the first abutting surface 2322 releases the drive section 2315 of the swing bar 2313 so that the stretching section 2314 of the swing bar 2313 swings outward and abuts the optical diffusion film 60.

[0062] The second opening mechanism 233 is provided with a second abutting surface 2332 and a second inclined surface 2331. The second inclined surface 2331 is located at one end of the second opening mechanism 233 near the first opening mechanism 232. The second inclined surface 2331 is positioned towards the drive section 2315. The second abutting surface 2332 is on the side of the second opening mechanism 233 away from the pre-shrinking station 21. During the process of the swing bar 2313 moving from the first opening mechanism 232 towards the second opening mechanism 233 along with the conveyor belt 2213, the second inclined surface 2331 contacts the drive section 2315 of the swing bar 2313 to drive the drive section 2315 to swing away from the pre-shrinking station 21. When the swing bar 2313 moves with the conveyor belt 2213 and leaves the optical diffusion film 60, the second abutting surface 2332 releases the drive section 2315 of the swing bar 2313 so that the stretching section 2314 of the swing bar 2313 swings outward and detaches from the optical diffusion film 60.

[0063] When the swing structure 231 moves to the position of the first inclined surface 2321, the guide stretching section 2314 of the first inclined surface 2321 swings away from the pre-shrinking station 21, causing the stretching section 2314 to swing towards the pre-shrinking station 21, thus increasing the distance between the two corresponding swing bars 2313 to ensure that the optical diffusion film 60 can pass through normally. At this time, the drive section 2315 abuts against the first abutting surface 2322. When the swing structure 231 disengages from the first abutting surface 2322, the swing structure 231 resets due to the action of the torsion spring 2318, causing the two stretching sections 2314 of the two corresponding swing bars 2313 to re-contact. This process clamps and stretches the two ends of the optical diffusion film 60 outward.

[0064] Similarly, when the swing structure 231 moves to the position of the second inclined plane 2331, it is guided to increase the distance between the two swing bars 2313, so as to ensure that the stretched optical diffusion film 60 can be removed from the pre-shrinking station 21.

[0065] In one embodiment of the present invention, the swing bar 2313 further includes a rubber block 2317, which is disposed at the end of the stretching section 2314 for contacting the optical diffusion film 60. Because the rubber block 2317 is elastic, when the two swing bars 2313 are vertically arranged, the end faces of the two rubber blocks 2317 abut together, ensuring the clamping tightness. When the swing bar 2313 swings, the two abutting rubber blocks 2317 are squeezed and deformed against each other, ensuring the clamping tightness while allowing the swing bar 2313 to swing. The shape of the rubber block 2317 is not limited, but the abutting surfaces of the two rubber blocks 2317 are planar, further improving the clamping tightness.

[0066] In one embodiment of the present invention, the inner edge and / or outer edge of the rubber block 2317 facing away from the end face of the fixing section 2317 are provided with chamfers. The chamfers can reduce damage to the optical diffusion film 60 during the swing clamping process.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An optical diffusion film pre-shrinkage mechanism, characterized in that, The optical diffusion film pre-shrinkage mechanism includes: frame; Two stretching assemblies are mounted on the frame and spaced apart, forming a pre-shrinking station between them. The optical diffusion film enters the coating machine after passing through the pre-shrinking station. The two stretching assemblies respectively clamp both sides of the optical diffusion film and stretch it outwards. A baking mechanism is provided above the pre-shrinking station and is used to bake the optical diffusion film that has passed through the pre-shrinking station. The stretching assembly includes a conveying structure and two clamping structures. The conveying structure is located on the frame, and the two clamping structures are located above and below the optical diffusion film, respectively. The two clamping structures are connected to the conveying structure. The conveying structure is used to drive the two clamping structures to move toward the coating machine, and the two clamping structures are used to clamp the optical diffusion film and move it away from the other stretching assembly. The conveying structure includes two conveying components. Each clamping structure is tractively connected to one of the conveying components. Each conveying component includes a driving member, two conveying wheels, and a conveyor belt. The driving member is mounted on the frame. The two conveying wheels are arranged sequentially along the conveying direction of the pre-shrinking mechanism and are rotatably connected to the frame. The central axis of each conveying wheel is vertically arranged. The driving member drives one of the conveying wheels to rotate. The conveyor belt is sleeved on the two conveying wheels. The clamping structure is tractively connected to the conveyor belt. The clamping structure includes multiple swing structures connected to the conveyor belt and arranged sequentially at intervals along the outer wall of the conveyor belt. Each swing structure includes two fixed blocks, a rotating shaft, and swing bars. The two fixed blocks protrude from the outer wall of the conveyor belt, and the rotating shaft is located between the two fixed blocks and rotatably connected to them. The rotating shaft extends along the conveying direction of the conveyor belt, and the swing bars are connected to the rotating shaft. The swing bars in the upper clamping structure correspond one-to-one with the swing bars in the lower clamping structure. When the paired swing bars swing in a direction away from the pre-shrinking station, they clamp the edge of the optical diffusion film and apply a pulling force outward.

2. The optical diffusion film pre-shrinkage mechanism as described in claim 1, characterized in that, The swing bar includes a stretching section, a driving section, and a fixed section. The stretching section is located close to the optical diffusion film, the driving section is located away from the optical diffusion film, and the fixed section is located between the stretching section and the driving section and is rotatably connected to the rotating shaft. The swing bar swings around the rotating shaft as the center. In the pair of swing bars, when the upper stretching section and the lower stretching section swing outward synchronously, they clamp and stretch the optical diffusion film.

3. The optical diffusion film pre-shrinkage mechanism as described in claim 2, characterized in that, The swing structure also includes a torsion spring, which is sleeved on the rotating shaft and connected at both ends to the fixed block and the fixed section, so that the swing bar has an outward swinging force.

4. The optical diffusion film pre-shrinkage mechanism as described in claim 3, characterized in that, The clamping structure further includes a first opening mechanism and a second opening mechanism; The first opening mechanism is located at the entrance end of the pre-shrinking station and is used to drive the pair of swing bars to open so as to hold the optical diffusion film. The second opening mechanism is located at the exit end of the pre-shrinking station and is used to drive the pair of swing bars to open so as to release the optical diffusion film.

5. The optical diffusion film pre-shrinkage mechanism as described in claim 4, characterized in that, The first opening mechanism has a first abutting surface and a first inclined surface. The first inclined surface is located at the end of the first opening mechanism away from the second opening mechanism and is positioned towards the driving section. The first abutting surface is on the side of the first opening mechanism away from the pre-shrinking station. During the movement of the swing bar towards the first opening mechanism with the conveyor belt, the first inclined surface contacts the driving section of the swing bar to drive the driving section to swing away from the pre-shrinking station. When the swing bar moves with the conveyor belt and reaches above the optical diffusion film, the first abutting surface releases the driving section of the swing bar so that the stretching section of the swing bar swings outward and abuts against the optical diffusion film. The second opening mechanism is provided with a second abutting surface and a second inclined surface. The second inclined surface is located at one end of the second opening mechanism near the first opening mechanism and is positioned towards the drive section. The second abutting surface is on the side of the second opening mechanism away from the pre-shrinking station. During the process of the swing bar moving from the first opening mechanism toward the second opening mechanism with the conveyor belt, the second inclined surface contacts the drive section of the swing bar to drive the drive section to swing away from the pre-shrinking station. When the swing bar moves with the conveyor belt and leaves the optical diffusion film, the second abutting surface releases the drive section of the swing bar so that the stretching section of the swing bar swings outward and detaches from the optical diffusion film.

6. The optical diffusion film pre-shrinkage mechanism as described in claim 3, characterized in that, The swing bar also includes a rubber block located at the end of the stretching section for contacting the optical diffusion film.

7. The optical diffusion film pre-shrinkage mechanism as described in claim 6, characterized in that, The inner edge and / or outer edge of the rubber block facing away from the fixed section are chamfered.

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