Automatic slitting device for liquid crystal screen backlight brightening film

Abstract

The utility model discloses a kind of liquid crystal screen backlight brightening film automatic slitting device, the utility model relates to brightening film cutting technical field.This liquid crystal screen backlight brightening film automatic slitting device includes support frame, the upper portion of support frame is provided with slitting mechanism, for slitting brightening film, the slitting mechanism includes: support assembly, including the support plate of fixed installation in the upper portion of support frame, the inside of support frame is movably installed with support roll, movable plate keeps top lifting state by the counterweight of its one side, the front side of silica gel plate forms smooth slope, in brightening film conveying process, slope can actively guide brightening film cutout to lift upwards, avoid brightening film because of gravity sagging to the gap of lower cutter and support plate;Meanwhile, the support strip above lower cutter keeps lifting state under the elastic force of support spring in non-cutting state, directly block the gap between lower cutter and support plate, prevent brightening film edge from being clamped into gap.

Description

Technical Field

[0001] This utility model relates to the field of brightness enhancement film cutting technology, specifically an automatic cutting device for brightness enhancement film of LCD backlight. Background Technology

[0002] A backlight is a light source located behind a liquid crystal display (LCD), and its light emission directly affects the visual effect of the liquid crystal display module (LCM). The LCD itself does not emit light; it displays graphics or is the result of its modulation of light. A backlight mainly consists of a light source, a light guide plate, optical modules, and structural components. The optical modules include brightness enhancement films / sheets, diffusion films / sheets, brightness enhancement films / sheets, and black / white adhesive, etc.

[0003] The existing utility model patent with publication number CN221021252U discloses an automatic cutting mechanism for backlight enhancement film, including a frame, a motor, multiple sets of conveying traction rollers, a cutter frame, a lifting cylinder, a fixed limiting plate, a movable limiting plate, an upper cutter mounting plate, an upper cutter, and a lower cutter. The cutter frame is located at the front end of the multiple sets of conveying traction rollers. The lifting cylinders are respectively located on both sides of the upper end of the cutter frame. The fixed limiting plates are respectively located on the rear side walls of both sides of the cutter frame. The movable limiting plates are respectively located on the front side walls of both sides of the cutter frame. The upper cutter mounting plates are slidably mounted on both sides of the cutter frame. The two sides of the upper cutter are detachably fixedly connected to the upper cutter mounting plates. The upper end of the upper cutter is detachably fixedly connected to the cylinder rod of the lifting cylinder. The lower cutter is slidably mounted on the lower end of the cutter frame. The technical solution of this utility model can effectively ensure the accuracy of the cutting length and effectively improve the cutting efficiency of the enhancement film.

[0004] The aforementioned cutting mechanism uses an upper and lower cutter for cutting, requiring sufficient space to be reserved for the travel of the upper and lower cutters. There is no structure to support the brightness enhancement film at the cut. Furthermore, this mechanism uses traction rollers to pull the brightness enhancement film. After cutting, the cut edge of the film bends and sags under gravity, preventing it from entering the area between the cutters and causing jamming, thus affecting continuous cutting. Additionally, the traction rollers are connected by gears, and the spacing between them cannot be adjusted. During use, the traction roller spacing cannot be adjusted according to the thickness of the brightness enhancement film, potentially leading to damage due to excessive pressure. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an automatic cutting device for backlight enhancement film of LCD screens, which solves the problems of material jamming and damage to the enhancement film due to excessive pressure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An automatic slitting device for backlight enhancement film of a liquid crystal screen includes a support frame, and a slitting mechanism is provided above the support frame for slitting the enhancement film. The slitting mechanism includes: The support assembly includes a support plate fixedly installed above a support frame, a support roller movably installed inside the support frame, a synchronous pulley fixedly installed at one end of the support roller, a synchronous belt sleeved on the outside of the synchronous pulley, a motor fixedly installed on one side of the support frame, a movable plate movably installed inside the support frame, a limit rod provided below the movable plate, a lower cutter fixedly installed between the support frames, a support bar movably installed above the lower cutter, and a support spring sleeved below the support bar. The cutting component, located above the support frame, is used to cut the brightening film.

[0007] Preferably, the cutting assembly includes a limiting frame fixedly installed above the support frame, a movable rod movably installed below the limiting frame, a pressure spring sleeved on the outer side of the movable rod, a pressure roller inserted through the bottom of the movable rod, a pressure cylinder fixedly installed above the limiting frame, and an upper cutter fixedly installed at the bottom end of the pressure cylinder.

[0008] Preferably, the support roller and the support frame are rotatably connected, the support roller can be connected by a synchronous pulley and a synchronous belt, one end of the support roller is fixedly connected to the rotating shaft of the motor, and both ends of the movable plate are provided with columnar structures, and the movable plate and the support frame are rotatably connected.

[0009] Preferably, a counterweight is provided on one side of the movable plate, a silicone plate is provided on the front side of the movable plate, the limiting rod is fixedly connected to the support frame, and the support bar is slidably connected to the lower cutter.

[0010] Preferably, the movable rod and the limiting frame are slidably connected, the pressure roller is slidably connected to the limiting frame via the movable rod, and the pressure spring is located between the movable rod and the limiting frame.

[0011] Preferably, the pressure roller is positioned above the corresponding support roller via a movable rod and a limiting frame, and the upper cutter is movably mounted below the limiting frame via a downward pressing cylinder, with the upper cutter located directly above the support bar.

[0012] Beneficial effects This invention provides an automatic slitting device for backlight brightness enhancement film of LCD screens. Compared with the prior art, it has the following advantages: (1) The automatic slitting device for backlight enhancement film of LCD screen is configured with a movable plate and a support bar: the movable plate is kept in a raised state by the counterweight on one side, and the silicone plate on its front side forms a smooth slope. During the conveying of the enhancement film, the slope can actively guide the cut of the enhancement film to rise upward, preventing the enhancement film from drooping into the gap between the lower cutter and the support plate due to gravity; at the same time, the support bar above the lower cutter will be kept in a raised state under the elastic force of the support spring when not cutting, directly sealing the gap between the lower cutter and the support plate, preventing the edge of the enhancement film from getting stuck in the gap. On the other hand, the support roller and the pressure roller work together to ensure the conveying stability: the pressure roller is always pressed tightly above the support roller under the action of the spring on the outside of the movable rod. The two clamp the enhancement film to form a stable conveying force, preventing the enhancement film from slipping or deviating during the conveying process, further reducing the probability of jamming, and ensuring the smoothness of continuous cutting.

[0013] (2) In this automatic slitting device for backlight enhancement film of LCD screen, the pressure roller is movably mounted below the limit frame via a movable rod. The downward pressure spring sleeved on the outside of the movable rod can provide continuous and adjustable downward pressure. When the enhancement film is thick, the enhancement film will push the pressure roller upward, and the pressure roller will drive the movable rod to compress the downward pressure spring. The elastic force of the downward pressure spring will be adaptively adjusted to avoid applying excessive pressure to the thick enhancement film. When the enhancement film is thin, the elastic force of the downward pressure spring can ensure that the pressure roller and the support roller are tightly matched, ensuring the conveying power while preventing the thin enhancement film from being deformed or damaged due to excessive pressure. In addition, the silicone plate on the front side of the movable plate is soft and can avoid rigid contact that could cause scratches or pressure damage to the surface of the enhancement film when guiding the enhancement film, further protecting the integrity of the enhancement film. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the synchronous pulley installation structure of this utility model; Figure 3 This is a schematic diagram of the support bar installation structure of this utility model; Figure 4 This is a schematic diagram of the upper cutting blade mounting structure of this utility model; In the diagram: 1. Support frame; 2. Cutting mechanism; 21. Support assembly; 211. Support plate; 212. Support roller; 213. Synchronous pulley; 214. Synchronous belt; 215. Motor; 216. Movable plate; 217. Limiting rod; 218. Lower cutter; 219. Support bar; 2110. Support spring; 22. Cutting assembly; 221. Limiting frame; 222. Movable rod; 223. Lower pressure spring; 224. Pressure roller; 225. Lower pressure cylinder; 226. Upper cutter. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: an automatic slitting device for backlight enhancement film of LCD screen includes a support frame 1, and a slitting mechanism 2 is provided above the support frame 1 for slitting the enhancement film. The slitting mechanism 2 includes: a support assembly 21, including a support plate 211 fixedly installed above the support frame 1; a support roller 212 movably installed inside the support frame 1; a synchronous wheel 213 fixedly installed at one end of the support roller 212; a synchronous belt 214 sleeved on the outside of the synchronous wheel 213; a motor 215 fixedly installed on one side of the support frame 1; a movable plate 216 movably installed inside the support frame 1; a limit rod 217 is provided below the movable plate 216; and a lower cutter is fixedly installed between the support frames 1. 218. A support bar 219 is movably installed above the lower cutter 218. A support spring 2110 is sleeved below the support bar 219. The support roller 212 is rotatably connected to the support frame 1. The support roller 212 can be connected through a synchronous pulley 213 and a synchronous belt 214. One end of the support roller 212 is fixedly connected to the rotating shaft of the motor 215. The two ends of the movable plate 216 are provided with columnar structures, and the movable plate 216 is rotatably connected to the support frame 1. A counterweight is provided on one side of the movable plate 216. A silicone plate is provided on the front side of the movable plate 216. The limit rod 217 is fixedly connected to the support frame 1. The support bar 219 is slidably connected to the lower cutter 218.

[0017] Specifically, the support plate 211 supports the brightness enhancement film. The support roller 212 is linked by the synchronous wheel 213 and the synchronous belt 214. When the motor 215 drives one support roller 212 to rotate, it can drive the other support roller 212 to rotate synchronously. Under the influence of the counterweight, the center of gravity of the movable plate 216 is located behind the hinge point between it and the support frame 1. The top of the movable plate 216 is in a raised state by default. The limit rod 217 can limit the maximum tilt angle of the movable plate 216. The inclined structure formed by the movable plate 216 guides the brightness enhancement film to be raised so that the cut of the brightness enhancement film can pass through the gap behind the lower cutter 218. The support strip 219 is located in front of the lower cutter 218 and can seal the gap between the lower cutter 218 and the support plate 211.

[0018] The cutting assembly 22, positioned above the support frame 1, is used for cutting the brightening film. The cutting assembly 22 includes a limiting frame 221 fixedly mounted above the support frame 1. A movable rod 222 is movably mounted below the limiting frame 221. A downward pressure spring 223 is sleeved on the outer side of the movable rod 222. A pressure roller 224 is inserted through the bottom of the movable rod 222. A downward pressure cylinder 225 is fixedly mounted above the limiting frame 221. An upper cutting blade 226 is fixedly mounted at the bottom end of the downward pressure cylinder 225. The movable rod 222 and the limiting frame 221 are slidably connected. The pressure roller 224 is slidably connected to the limiting frame 221 through the movable rod 222. The pressure spring 223 is located between the movable rod 222 and the limiting frame 221. The pressure roller 224 is set above the corresponding support roller 212 through the movable rod 222 and the limiting frame 221. The upper cutter 226 is movably installed below the limiting frame 221 through the lower cylinder 225, and the upper cutter 226 is located directly above the support bar 219.

[0019] Specifically, the limiting frame 221 restricts the movement direction of the movable rod 222. A downward pressure spring 223, sleeved on the outside of the movable rod 222, provides downward pressure to the movable rod 222, causing the pressure roller 224 between the movable rods 222 to press downwards above the corresponding support roller 212. This clamps the brightening film between the support roller 212 and the pressure roller 224, increasing the relative friction between the brightening film and the support roller 212, facilitating the movement of the brightening film by the support roller 212. The downward pressure cylinder 225 drives the upper cutter 226 downwards, causing the upper cutter 226 to move the support strip 219 downwards and compress the support spring 2110 until it, together with the lower cutter 218, cuts the brightening film. Meanwhile, all content not described in detail in this specification is prior art known to those skilled in the art.

[0020] During operation, the brightening film is first placed on the support plate 211 above the support frame 1. The motor 215 fixed on one side of the support frame 1 is started. The rotating shaft of the motor 215 drives the support roller 212 fixed thereto to rotate. The support roller 212 drives another support roller 212 to rotate synchronously through the synchronous wheel 213 fixed at one end and the synchronous belt 214 sleeved on the outside. At the same time, the movable rod 222 installed below the limit frame 221 applies downward force under the action of the downward pressure spring 223 sleeved on the outside, so that the pressure roller 224 inserted at the bottom of the movable rod 222 presses tightly on the corresponding support roller 212. The support roller 212 and the pressure roller 224 cooperate to clamp the brightening film, and the friction force drives the brightening film to move towards the cutting area. During the movement of the brightness enhancement film, the movable plate 216 inside the support frame 1 is kept in an upright position due to the action of a counterweight on one side. The limiting rod 217 limits its maximum tilt angle, and the silicone plate on its front side forms an inclined surface to guide the brightness enhancement film and prevent it from sagging. When the brightness enhancement film moves above the lower cutter 218, the downward pressure cylinder 225 fixed above the limiting frame 221 is activated, pushing the upper cutter 226 fixed at the bottom to move downward. The upper cutter 226 first contacts the lower cutter 218. The support bar 219 is installed in a movable manner, and then the support bar 219 is pressed down and the support spring 2110 sleeved below it is squeezed until the upper cutter 226 and the lower cutter 218 cooperate to complete the cutting of the brightening film. After cutting, the lower cylinder 225 drives the upper cutter 226 to reset, and the support spring 2110 pushes the support bar 219 back to its original position to seal the gap between the lower cutter 218 and the support plate 211. At the same time, the support roller 212 continues to transport the cut brightening film, completing one automatic cutting process.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic slitting device for backlight enhancement film of liquid crystal screen, comprising a support frame (1), characterized in that: A slitting mechanism (2) is provided above the support frame (1) for slitting the brightening film. The slitting mechanism (2) includes: The support assembly (21) includes a support plate (211) fixedly installed above the support frame (1), a support roller (212) is movably installed inside the support frame (1), a synchronous pulley (213) is fixedly installed at one end of the support roller (212), a synchronous belt (214) is sleeved on the outside of the synchronous pulley (213), a motor (215) is fixedly installed on one side of the support frame (1), a movable plate (216) is movably installed inside the support frame (1), a limit rod (217) is provided below the movable plate (216), a lower cutter (218) is fixedly installed between the support frames (1), a support bar (219) is movably installed above the lower cutter (218), and a support spring (2110) is sleeved below the support bar (219). The cutting component (22) is located above the support frame (1) and is used to cut the brightening film.

2. The automatic slitting device for backlight brightness enhancement film of a liquid crystal screen according to claim 1, characterized in that: The cutting assembly (22) includes a limiting frame (221) fixedly installed above the support frame (1), a movable rod (222) is movably installed below the limiting frame (221), a pressure spring (223) is sleeved on the outside of the movable rod (222), a pressure roller (224) is inserted through the bottom of the movable rod (222), a pressure cylinder (225) is fixedly installed above the limiting frame (221), and an upper cutter (226) is fixedly installed at the bottom end of the pressure cylinder (225).

3. The automatic slitting device for backlight brightness enhancement film of a liquid crystal screen according to claim 1, characterized in that: The support roller (212) is rotatably connected to the support frame (1). The support roller (212) can be connected by a synchronous pulley (213) and a synchronous belt (214). One end of the support roller (212) is fixedly connected to the rotating shaft of the motor (215). The two ends of the movable plate (216) are provided with columnar structures, and the movable plate (216) is rotatably connected to the support frame (1).

4. The automatic slitting device for backlight brightness enhancement film of a liquid crystal screen according to claim 1, characterized in that: A counterweight is provided on one side of the movable plate (216), a silicone plate is provided on the front side of the movable plate (216), the limiting rod (217) is fixedly connected to the support frame (1), and the support bar (219) is slidably connected to the lower cutter (218).

5. The automatic slitting device for backlight brightness enhancement film of a liquid crystal screen according to claim 2, characterized in that: The movable rod (222) and the limiting frame (221) are connected in a sliding manner. The pressure roller (224) is connected in a sliding manner with the limiting frame (221) through the movable rod (222). The pressure spring (223) is located between the movable rod (222) and the limiting frame (221).

6. The automatic slitting device for backlight brightness enhancement film of a liquid crystal screen according to claim 2, characterized in that: The pressure roller (224) is positioned above the corresponding support roller (212) via a movable rod (222) and a limiting frame (221). The upper cutter (226) is movably installed below the limiting frame (221) via a pressing cylinder (225), and the upper cutter (226) is located directly above the support bar (219).

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