Unreeling mechanism of reel-to-reel plate reeling and unreeling machine

Abstract

The invention discloses an unwinding mechanism of a reel-to-reel board winding and unwinding machine, which is used for conveying a flexible circuit board to an exposure machine. The unwinding rack is movably arranged at the bottom of the case; the unwinding assembly comprises an unwinding roller which is rotatably mounted with the unwinding rack, and the unwinding roller is used for bearing a coiled flexible circuit board; the feeding assembly and the unwinding rack are installed and close to one side of the exposure machine, and the feeding assembly is used for guiding conveying of the flexible circuit board; the deviation rectifying device is arranged between the case and the unwinding rack; wherein in the conveying process of the flexible circuit board, the deviation correcting device is configured to control the unwinding rack to move relative to the case when it is detected that the feeding position of the flexible circuit board deviates, so that the deviation of the flexible circuit board is corrected. The position of the whole unwinding rack is dynamically adjusted to rectify deviation, the whole fine adjustment mode is softer, and stress borne by the flexible circuit board in the conveying process is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of flexible circuit board manufacturing technology, and more specifically to an unwinding mechanism for a roll-to-roll unwinding machine. Background Technology

[0002] Flexible circuit boards (PCBs) are a crucial component of modern electronic devices, and their manufacturing quality directly impacts the performance and reliability of electronic products. In roll-to-roll production lines, the unwinding mechanism, as the initial step, is critical to the stability and precision of subsequent processes such as exposure and etching.

[0003] Existing unwinding mechanisms typically consist of simple components such as unwinding rollers and guide rollers. However, during the unwinding process, factors such as end face movement and tension fluctuations of the coil material itself can easily cause the sheet material to deviate from its intended path. If this deviation is not corrected in time, it will lead to misalignment of the sheet material when it enters the exposure machine. This can result in minor issues such as incorrect pattern alignment and product scrap, or even major issues such as tape breakage and material jamming, causing production interruptions.

[0004] Existing technologies use alignment rollers to directly adjust the conveying path of the board material, but this method may generate additional stress on thin and soft flexible circuit boards, posing a risk of damage.

[0005] Therefore, it is necessary to provide a new approach to solve the aforementioned technical problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an unwinding mechanism for a roll-to-roll unwinding machine. This mechanism corrects deviations by dynamically adjusting the position of the entire unwinding frame, replacing the method of forcibly pulling or twisting the board material itself. The overall fine-tuning method is more gentle and effectively reduces the stress on the flexible circuit board during transportation.

[0007] The technical solution of this invention is summarized as follows: This invention provides an unwinding mechanism for a roll-to-roll unwinding machine for conveying flexible circuit boards to an exposure machine, comprising: Chassis; An unwinding frame is movably mounted at the bottom of the housing; An unwinding assembly includes an unwinding roller rotatably mounted to the unwinding frame, the unwinding roller being used to carry a rolled flexible circuit board. A feeding assembly, which is mounted to the unwinding frame and close to the exposure machine, is used to form a conveying guide for the flexible circuit board; A web-correcting device is disposed between the chassis and the unwinding frame; During the flexible circuit board conveying process, the correction device is configured to control the unwinding frame to move relative to the chassis when a shift in the feeding position of the flexible circuit board is detected, so as to correct the shift of the flexible circuit board.

[0008] Preferably, the correction device includes a detection element and an adjustment assembly; wherein, The detection component is fixedly installed with the chassis and positioned close to the feeding assembly to detect the position of the flexible circuit board in real time. The adjustment component is disposed between the chassis and the unwinding frame, and is used to drive the unwinding frame to move.

[0009] Preferably, the detection element is located between the feeding assembly and the exposure machine.

[0010] Preferably, the unwinding frame moves in a direction perpendicular to the conveying direction of the flexible circuit board.

[0011] Preferably, it further includes a dust removal device, which is fixedly installed with the unwinding frame and located between the unwinding assembly and the feeding assembly, to clean the surface of the flexible circuit board during the conveying process.

[0012] Preferably, the dust removal device includes: At least one pair of adhesive rollers are used to hold and contact the upper and lower surfaces of the flexible circuit board to adhere foreign matter to the surface of the flexible circuit board. At least one pair of cleaning rollers are respectively pressed into contact with the corresponding adhesive rollers for cleaning the adhesive rollers.

[0013] Preferably, it further includes: a tensioning assembly, which comprises a tensioning roller assembly and a detection assembly; wherein, The tensioning roller assembly is mounted to the unwinding frame to tension the flexible circuit board; The detection component is used to detect the conveying tension of the flexible circuit board; The tensioning roller assembly is configured to adjust the conveying tension of the flexible circuit board based on the data fed back by the detection assembly, so as to achieve constant tension control.

[0014] Preferably, it further includes: a transmission mechanism, the transmission mechanism comprising a plurality of guide rollers rotatably mounted to the unwinding frame, including at least a first guide roller and a second guide roller; wherein, The first guide roller is disposed between the unwinding roller and the dust removal device, and the second guide roller is disposed between the dust removal device and the tensioning assembly.

[0015] Preferably, the feeding assembly includes a feeding bracket, a feeding roller, and an antistatic component; wherein, The feeding bracket is fixedly installed with the unwinding machine frame; The feeding roller is rotatably mounted to the feeding bracket to guide the flexible circuit board and transport it to the exposure machine; The static elimination component includes at least one pair of static bars, which are fixed to the feeding bracket and positioned above and below the feeding side of the feeding roller to eliminate static electricity on the upper and lower surfaces of the flexible circuit board.

[0016] Preferably, it further includes: a cutting and splicing table, which is fixedly installed with the unwinding frame and located between the unwinding roller and the dust removal device, for cutting and / or splicing the flexible circuit board.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides an unwinding mechanism for a roll-to-roll unwinding machine. Through a correction device, it can automatically correct deviations in flexible circuit boards during transport in real time, ensuring the boards enter the exposure machine at a precise position, thus improving the accuracy and yield of the exposure process. By dynamically adjusting the position of the entire unwinding frame to correct deviations, it replaces the method of forcibly pulling or twisting the boards themselves. This overall fine-tuning method is gentler, effectively reducing the stress on the flexible circuit boards during transport and avoiding stretching, deformation, or damage to the boards that may result from the correction action. It ensures the stability and smoothness of the unwinding process, achieving fully automated and intelligent production.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the unwinding mechanism in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the unwinding mechanism in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the installation of the unwinding frame and the chassis in an embodiment of the present invention; Figure 4 This is a schematic diagram showing the conveying direction and correction direction of the flexible circuit board in an embodiment of the present invention; Figure 5 This is a schematic diagram of the transport path of the flexible circuit board in an embodiment of the present invention; Figure 6This is a schematic diagram of the unwinding assembly in an embodiment of the present invention; Figure 7 This is a schematic diagram of the dust removal device in an embodiment of the present invention; Figure 8 This is a schematic diagram of the operation of the adhesive roller and the cleaning roller in an embodiment of the present invention; Figure 9 This is a diagram showing the assembly position relationship of the unwinding assembly, the first guide roller, the second guide roller, and the tensioning assembly in an embodiment of the present invention. Figure 10 This is a schematic diagram of the tensioning component in an embodiment of the present invention; Figure 11 This is a schematic diagram of the feeding assembly in an embodiment of the present invention; Figure 12 This is a schematic diagram of the cutting and splicing table in an embodiment of the present invention.

[0020] In the diagram: 10, unwinding mechanism; P, flexible circuit board; 11. Chassis; 12. Unwinding frame; 13. Unwinding assembly; 131. Unwinding roller; 132. Unwinding drive component; 14. Feeding assembly; 141. Feeding bracket; 142. Feeding roller; 143. Static control bar; 144. Leveling and clamping component; 15. Tracking device; 151. Detection component; 152. Adjustment assembly; 1521. Linear drive mechanism; 1522. Guide assembly; 16. Dust removal device; 61. Adhesive roller; 162. Cleaning roller; 17. Tensioning assembly; 171. Tensioning roller assembly; 1711. Tensioning bracket; 1712a. First tensioning roller; 1712b. Second tensioning roller; 1713. Tensioning drive; 17131. Power output shaft; 181. First guide roller; 182. Second guide roller; 19. Cutting and splicing table; 191. Workbench surface; 1911. Pressing component. Detailed Implementation

[0021] 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 them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0023] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These are relative concepts and may vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0024] Terms involving attachment, connection, etc. (e.g., “connection” and “attachment”) refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as movable or rigid attachments or relationships, unless otherwise explicitly stated. Example

[0025] This invention provides an unwinding mechanism 10 for a roll-to-roll unwinding machine, used to transport flexible circuit boards to an exposure machine, combined with... Figures 1-12 As shown, it includes: Chassis 11; An unwinding frame 12 is movably disposed at the bottom of the housing 11; The unwinding assembly 13 includes an unwinding roller 131 rotatably mounted to the unwinding frame 12, the unwinding roller 131 being used to carry a rolled flexible circuit board. The feeding assembly 14 is mounted to the unwinding frame 12 and close to the exposure machine to form a conveying guide for the flexible circuit board. The correction device 15 is disposed between the housing 11 and the unwinding frame 12; During the flexible circuit board conveying process, the correction device 15 is configured to control the unwinding frame 12 to move relative to the housing 11 when a shift in the feeding position of the flexible circuit board is detected, so as to correct the shift of the flexible circuit board.

[0026] In this embodiment, the correction action is equivalent to adjusting the supply path of the entire flexible circuit board roll from the unwinding source, thereby pulling the misaligned flexible circuit board material back onto the predetermined conveying path.

[0027] This embodiment uses the correction device 15 to automatically correct the deviation of the flexible circuit board during the conveying process in real time, ensuring that the board enters the exposure machine in a precise position, thereby improving the accuracy and yield of the exposure process. The correction is achieved by dynamically adjusting the position of the entire unwinding frame 12, which replaces the method of forcibly pulling or twisting the board itself. The overall fine-tuning method is more gentle, effectively reducing the stress on the flexible circuit board during the conveying process, avoiding the stretching, deformation or damage of the board that may be caused by the correction action, ensuring the stability and smoothness of the unwinding process, and realizing automated and intelligent production.

[0028] In some embodiments, such as Figure 6 As shown, the unwinding assembly 13 includes an unwinding roller 131 and an unwinding drive 132. The unwinding drive 132 is fixedly installed with the unwinding frame 12, and the power output end of the unwinding drive 132 is installed with the unwinding roller 131 to drive the unwinding roller 131 to rotate and unwind the flexible circuit board P.

[0029] Furthermore, the unwinding roller 131 is an air-expanding shaft; wherein, the air-expanding shaft locks or unlocks the core of the flexible circuit board roll by inflating or deflating; in this embodiment, by using an air-expanding shaft as the unwinding roller 131, the quick clamping and unloading of the flexible circuit board P roll is realized, significantly improving the roll changing efficiency; at the same time, the air-expanding shaft contacts the inner wall of the core of the flexible circuit board P roll through uniform radial expansion force, which can provide strong torque transmission capability and avoid slippage, effectively preventing mechanical damage to the flexible circuit board P.

[0030] In some embodiments, combined with Figure 1 , Figures 3-4 As shown, the correction device 15 includes a detection element 151 and an adjustment assembly 152; wherein, The detection component 151 is fixedly installed with the chassis 11 and positioned close to the feeding assembly 14 to detect the position of the flexible circuit board in real time. The adjustment component 152 is disposed between the chassis 11 and the unwinding frame 12 and is used to drive the unwinding frame 12 to move.

[0031] Specifically, the detection element 151 and the adjustment component 152 are electrically connected to the control system. When the control system receives the offset signal from the detection element 151, it controls the adjustment component 152 to move, thereby driving the unwinding frame 12 to move.

[0032] In some alternative embodiments, the detection element 151 is one of a CCD vision sensor, a photoelectric sensor, or an ultrasonic sensor. For example, a CCD vision sensor can be used to detect edges or markers through image processing; a photoelectric sensor can be used to detect edges by utilizing the reflection or transmission of light; and an ultrasonic sensor can be used to measure distance by sound wave reflection.

[0033] In some preferred embodiments, the detection element 151 is disposed between the feeding assembly 14 and the exposure machine. That is, by placing the detection element 151 at the feeding assembly 14 closest to the exposure machine, the most accurate and timely positional deviation of the flexible circuit board material before entering the exposure machine can be detected. Specifically, the control system immediately controls the adjustment assembly 152 to adjust the position of the entire unwinding frame 12 according to the deviation signal, so as to achieve rapid correction at the source of error and fundamentally ensure that the flexible circuit board material enters the exposure machine in an accurate position, which greatly improves the exposure alignment accuracy and product yield.

[0034] In some embodiments, the adjustment component 152 includes a linear drive mechanism 1521 and a guide component 1522; wherein, The linear drive mechanism 1521 is fixedly installed at the bottom of the housing 11, and the power output end of the linear drive mechanism 1521 is installed at the unwinding frame 12. The guide assembly 1522 is disposed between the bottom of the chassis 11 and the bottom of the unwinding frame 12.

[0035] In some alternative embodiments, the guide assembly 1522 includes a slider fixed to the bottom of the unwinding frame 12 and a guide rail fixed to the bottom of the housing 11. When the linear drive mechanism 1521 acts on the unwinding frame 12, the unwinding frame 12 is slidably connected to the guide rail via the slider.

[0036] In some alternative embodiments, the linear drive mechanism 1521 is one of a servo motor driven linear module, a stepper motor driven linear module, or a cylinder drive mechanism.

[0037] In this embodiment, the cooperation between the linear drive mechanism 1521 and the guide component 1522 ensures that the movement of the unwinding frame 12 is not only responsive and precise, but also runs smoothly without shaking or jamming, avoiding secondary interference or vibration introduced by the correction action itself, and ensuring the stability of the conveying process.

[0038] Furthermore, the moving direction of the unwinding frame 12 is perpendicular to the conveying direction of the flexible circuit board; combined with Figure 4As shown, direction A represents the conveying direction of the flexible circuit board, and direction B represents the moving direction of the unwinding frame 12. When the detection element 151 detects that the flexible circuit board has shifted to one side of the conveying path, the control system instructs the adjustment component 152 to drive the unwinding frame 12 to move a corresponding displacement in the opposite direction. This embodiment can achieve efficient and accurate correction of lateral offset of the flexible circuit board material, avoiding damage that may be caused by oblique pulling or twisting of the material.

[0039] In the precision manufacturing process of flexible circuit boards, even the smallest dust particles can become a potential threat to product quality; therefore, in some preferred embodiments, combined with Figures 7-8 As shown, it also includes a dust removal device 16, which is fixedly installed with the unwinding frame 12 and located between the unwinding assembly 13 and the feeding assembly 14, so as to clean the surface of the flexible circuit board during the conveying process and thoroughly remove the dust from the surface of the flexible circuit board.

[0040] Furthermore, the dust removal device 16 includes: At least one pair of adhesive rollers 161, which clamp and contact the upper and lower surfaces of the flexible circuit board for adhering foreign matter to the surface of the flexible circuit board; At least one pair of cleaning rollers 162 are pressed into contact with the corresponding adhesive rollers 161 for cleaning the adhesive rollers 161.

[0041] Specifically, combined Figure 8 As shown, two adhesive rollers 161 contact the upper and lower surfaces of the flexible circuit board P with a slight clamping manner. When the flexible circuit board P passes through, the adhesive rollers 161 directly adhere to the dust, fibers, and other foreign objects on the surface of the flexible circuit board P through the sticky substance on their surfaces. Two cleaning rollers 162 press against the corresponding adhesive rollers 161 and roll in opposite directions. During the operation of the adhesive rollers 161, the contaminants adhering to their surfaces are continuously transferred to the cleaning rollers 162, thereby achieving self-cleaning of the surface of the adhesive rollers 161 and ensuring a continuous and stable dust removal effect.

[0042] In some alternative embodiments, the roller body of the adhesive roller 161 is made of an elastic material with pressure-sensitive adhesion, such as silicone, polyurethane, or specialty rubber, to ensure full and gentle contact with the flexible circuit board.

[0043] In some alternative embodiments, the cleaning roller 162 is a roll-type cleaning roller 162, with a surface covered by a replaceable adhesive paper layer. This design allows the cleaning capability to be quickly restored by tearing off the contaminated adhesive paper layer and exposing the new adhesive paper layer without stopping the production line, ensuring the continuity and efficiency of dust removal operations, achieving rapid maintenance, greatly improving production efficiency, and saving consumable costs by eliminating the need to replace the entire cleaning roller 162.

[0044] In some embodiments, combined with Figure 9 and Figure 10 As shown, it also includes: a tensioning assembly 17, which includes a tensioning roller assembly 171 and a detection assembly (not shown in the figure); wherein, The tensioning roller assembly 171 is installed with the unwinding frame 12 to tension the flexible circuit board; The detection component is used to detect the conveying tension of the flexible circuit board; The tensioning roller assembly 171 is configured to adjust the conveying tension of the flexible circuit board based on the data fed back by the detection assembly, so as to achieve constant tension control.

[0045] Furthermore, the tensioning roller assembly 171 includes a tensioning bracket 1711, a tensioning roller group, and a tensioning drive component 1713; wherein, The tensioning roller assembly includes a first tensioning roller 1712a and a second tensioning roller 1712b mounted to the tensioning bracket 1711; The tensioning drive 1713 is fixedly installed with the unwinding frame 12, and the power output shaft 17131 of the tensioning drive 1713 is connected to the tensioning bracket 1711. When the detection component detects a change in the conveying tension of the flexible circuit board, it controls the tensioning drive 1713 to drive the tensioning bracket 1711 to swing around the power output shaft 17131 to change the position of the first tensioning roller 1712a and the second tensioning roller 1712b on the flexible circuit board, so as to adjust the conveying tension of the flexible circuit board and maintain a constant and stable conveying tension.

[0046] This embodiment can adjust the tension in real time and accurately, effectively suppressing tension disturbances caused by factors such as changes in unwinding diameter and speed fluctuations, and providing extremely stable feeding conditions for the exposure process; in addition, the tension roller assembly 171 in this embodiment can achieve a gentler adjustment method, avoiding sudden force impacts that stretch or damage the thin flexible circuit board.

[0047] In some embodiments, combined with Figure 4 , Figure 5 , Figure 9 As shown, it also includes: a transmission mechanism, which includes a plurality of guide rollers rotatably mounted to the unwinding frame 12, including at least a first guide roller 181 and a second guide roller 182; wherein, The first guide roller 181 is disposed between the unwinding roller 131 and the dust removal device 16, and the second guide roller 182 is disposed between the dust removal device 16 and the tensioning assembly 17 to guide the flexible circuit board P in the conveying path.

[0048] Through the specific layout of the first guide roller 181 and the second guide roller 182 in this embodiment, combined with Figure 5 As shown, the unwinding assembly 13, dust removal device 16, tensioning assembly 17 and feeding assembly 14 are connected in series to form a continuous and reliable conveying path; multiple guide rollers can form multi-point support and constraint for the flexible circuit board P, enhance the flatness and stability of the flexible circuit board P during high-speed conveying, and effectively suppress the lateral shaking, drifting or sagging of the flexible circuit board P caused by tension fluctuations or high-speed operation, creating a stable reference for the correction device 15 and high-precision exposure.

[0049] In some embodiments, combined with Figure 11 As shown, the feeding assembly 14 includes a feeding bracket 141, a feeding roller 142, and an antistatic assembly; wherein, The feeding bracket 141 is fixedly installed with the unwinding frame 12; The feeding roller 142 is rotatably mounted to the feeding bracket 141 to guide the flexible circuit board and transport it to the exposure machine. The static elimination component includes at least one pair of static bars 143, which are fixed to the feeding bracket 141 and disposed above and below the feeding side of the feeding roller 142, in order to eliminate static electricity on the upper and lower surfaces of the flexible circuit board.

[0050] Specifically, the electrostatic bar 143 is installed closer to the exposure machine than the feeding roller 142. This means the electrostatic bar 143 performs electrostatic elimination at the last moment before the flexible circuit board material enters the exposure machine, which has extremely high cleanliness requirements. This ensures the flexible circuit board is exposed in a highly clean state, further avoiding graphic defects caused by dust adsorption due to electrostatic discharge and improving the product yield. Furthermore, by simultaneously neutralizing the electrostatic charge on both the upper and lower surfaces of the flexible circuit board, double-sided synchronous processing is achieved, resulting in a thorough and reliable effect. In addition, the electrostatic bar 143 is directly integrated into the feeding bracket 141. The feeding roller 142 is responsible for precise guidance and conveying, while the electrostatic bar 143 is responsible for the final surface treatment. The two work together on the feeding bracket 141, resulting in a compact structure that saves overall equipment space and has a reasonable layout.

[0051] Furthermore, the feeding assembly 14 also includes a leveling mechanism, which is mounted to the feeding bracket 141 and located directly above the feeding roller 142, and the leveling mechanism includes a leveling drive component and a leveling clamping component 144; wherein, The leveling drive component is fixedly installed with the feeding bracket 141, and the power output end of the leveling drive component is connected to the leveling clamping component 144. The flattening clamping member 144 is configured to approach the feeding roller 142 under the drive of the flattening drive member, so as to press the flexible circuit board against the feeding roller 142, and to flatten the flexible circuit board before it enters the exposure machine, thereby eliminating focal length deviation and pattern alignment errors caused by unevenness of the board surface, ensuring exposure alignment accuracy, and improving product yield.

[0052] In some embodiments, it further includes: a cutting and splicing table 19, which is fixedly installed with the unwinding frame 12 and located between the unwinding roller 131 and the dust removal device 16, for cutting and / or splicing flexible circuit boards; for example, connecting the end of the old material roll that is about to be unwound with the beginning of the new material roll, thereby achieving continuous production without stopping the machine.

[0053] Furthermore, combined Figure 12 As shown, the cutting and splicing table 19 includes two interlocking work surfaces 191. Each work surface 191 is provided with a clamping member 1911 for pressing the flexible circuit board, a cutting member for cutting the flexible circuit board, and a splicing member for connecting the flexible circuit boards. The cutting member can be a cutting blade, and the splicing member can be an adhesive tape bonding device.

[0054] For example, in this embodiment, a first workbench 191 and a second workbench 191 are provided. The first workbench 191 is used to fix the tail of the old material roll, and the second workbench 191 is used to fix and process the head of the new material roll. Then, the tail of the old material roll is connected to the head of the new material roll, thereby realizing continuous production and effectively improving the overall production efficiency.

[0055] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A roll-off mechanism of a roll-to-roll board handler for feeding a flexible circuit board to an exposure machine, characterized by, include: Chassis; An unwinding frame is movably mounted at the bottom of the housing; An unwinding assembly includes an unwinding roller rotatably mounted to the unwinding frame, the unwinding roller being used to carry a rolled flexible circuit board. A feeding assembly, which is mounted to the unwinding frame and close to the exposure machine, is used to form a conveying guide for the flexible circuit board; A web-correcting device is disposed between the chassis and the unwinding frame; During the flexible circuit board conveying process, the correction device is configured to control the unwinding frame to move relative to the chassis when a shift in the feeding position of the flexible circuit board is detected, so as to correct the shift of the flexible circuit board.

2. The unwinding mechanism of the roll-to-roll sheet take-up and pay-off machine according to claim 1, characterized in that: The correction device includes a detection element and an adjustment assembly; wherein... The detection component is fixedly installed with the chassis and positioned close to the feeding assembly to detect the position of the flexible circuit board in real time. The adjustment component is disposed between the chassis and the unwinding frame, and is used to drive the unwinding frame to move.

3. The unwinding mechanism of the roll-to-roll sheet take-up and pay-off machine according to claim 2, characterized in that: The testing component is located between the feeding assembly and the exposure machine.

4. The unwinding mechanism of the roll-to-roll sheet take-up and pay-off machine according to claim 2, characterized in that: The unwinding frame moves in a direction perpendicular to the conveying direction of the flexible circuit board.

5. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 1, characterized in that, Also includes: A dust removal device is fixedly installed with the unwinding frame and located between the unwinding assembly and the feeding assembly to clean the surface of the flexible circuit board during the conveying process.

6. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 5, characterized in that: The dust removal device includes: At least one pair of adhesive rollers are used to hold and contact the upper and lower surfaces of the flexible circuit board to adhere foreign matter to the surface of the flexible circuit board. At least one pair of cleaning rollers are respectively pressed into contact with the corresponding adhesive rollers for cleaning the adhesive rollers.

7. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 5, characterized in that, Also includes: The tensioning assembly includes a tensioning roller assembly and a detection assembly; wherein... The tensioning roller assembly is mounted to the unwinding frame to tension the flexible circuit board; The detection component is used to detect the conveying tension of the flexible circuit board; The tensioning roller assembly is configured to adjust the conveying tension of the flexible circuit board based on the data fed back by the detection assembly, so as to achieve constant tension control.

8. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 7, characterized in that, Also includes: The transmission mechanism includes a plurality of guide rollers rotatably mounted to the unwinding frame, including at least a first guide roller and a second guide roller; wherein, The first guide roller is disposed between the unwinding roller and the dust removal device, and the second guide roller is disposed between the dust removal device and the tensioning assembly.

9. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 1, characterized in that: The feeding assembly includes a feeding bracket, a feeding roller, and an anti-static component; wherein... The feeding bracket is fixedly installed with the unwinding machine frame; The feeding roller is rotatably mounted to the feeding bracket to guide the flexible circuit board and transport it to the exposure machine; The static elimination component includes at least one pair of static bars, which are fixed to the feeding bracket and positioned above and below the feeding side of the feeding roller to eliminate static electricity on the upper and lower surfaces of the flexible circuit board.

10. The unwinding mechanism of the roll-to-roll unwinding machine as described in claim 5, characterized in that, Also includes: A cutting and splicing table is fixedly installed with the unwinding frame and located between the unwinding roller and the dust removal device to cut and / or splice flexible circuit boards.

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