Tightness adjusting mechanism for winding and unwinding disc roller

Abstract

The invention discloses a take-up and pay-off tray roller fine adjustment tightness mechanism, which comprises a first mounting frame, a second mounting frame, a third mounting frame, a fourth mounting frame, a fifth mounting frame and a sixth mounting frame, the servo motor is mounted on the first mounting frame, an output shaft of the servo motor is connected with the receiving disc, and the output shaft of the servo motor and a rotating shaft of the receiving disc are coaxially arranged; and the first controller is mounted on one side of the receiving disc and is in signal connection with the servo motor. The servo motor is additionally arranged in the rotating center of the material receiving disc, the servo motor can accurately execute and rapidly respond to a torque instruction calculated by the controller, high-precision and rapid-response control over the material receiving and discharging process is achieved, when the rolling diameter changes, acceleration and deceleration or material tension suddenly changes, the output torque is rapidly adjusted, the tension is dynamically maintained to be constant, loosening or snapping is avoided, and the service life of the material receiving disc is prolonged. Therefore, the condition of slipping or overlarge resistance is avoided, the processing, processing or transferring quality of the coiled material is improved, and meanwhile, the production and speed can be increased.

Description

Technical Field

[0001] This invention relates to the field of roll material take-up and untake-up technology, specifically to a take-up and untake-up reel roller fine-tuning tension mechanism. Background Technology

[0002] The take-up and take-up rollers are core components in roll-to-roll processing equipment and are widely used in industrial fields that require handling, processing, or transferring roll materials. Their main function is to efficiently and controllably complete the material feeding and take-up process.

[0003] Existing take-up and untake-up rollers are installed separately at both ends of roll-to-roll processing equipment, such as coating machines, laminating machines, foil rolling mills, and printing machines. Because the positions of these rollers are fixed, their tension is uncontrollable. During the take-up and untake-up process, the diameter of the rolled material continuously changes, easily leading to roller slippage or motor inability to pull, thus affecting production efficiency. Therefore, there is an urgent need to design a fine-tuning mechanism for the take-up and untake-up rollers. By adjusting the tension of the rollers, a constant tension can be dynamically maintained, preventing slippage and excessive resistance. Summary of the Invention

[0004] The purpose of this invention is to provide a fine-tuning mechanism for the take-up and feed tray rollers, which solves the problem that existing take-up and feed tray rollers are prone to slippage or motor failure during the take-up and feed process.

[0005] To achieve this objective, the present invention adopts the following technical solution: The fine-tuning mechanism for the feed tray rollers includes: The first mounting bracket, installed on one side of the receiving tray, is used to mount the servo motor; A servo motor is mounted on the first mounting bracket. The output shaft of the servo motor is connected to the take-up tray, and the output shaft of the servo motor is coaxial with the rotation shaft of the take-up tray. The first controller is installed on one side of the receiving tray and is connected to the servo motor signal.

[0006] Furthermore, a side plate is provided on one side of the receiving / discharging tray, and the output shaft of the servo motor is connected to the rotating shaft of the receiving tray via a diaphragm coupling.

[0007] Furthermore, the diaphragm coupling is provided with two sets of diaphragms, each set of diaphragms having a corrugated shape in the axial cross section.

[0008] Furthermore, the thickness of the diaphragm in the diaphragm coupling is less than the thickness at the edges.

[0009] Furthermore, it also includes a magnetic powder clutch, a magnetic powder brake, and a second controller; The magnetic powder clutch is located between the servo motor and the take-up tray. The two ends of the magnetic powder clutch are connected to the rotating shaft of the take-up tray and the output shaft of the servo motor respectively through diaphragm couplings. A second mounting bracket is installed on one side of the take-up tray, which is equipped with the first mounting bracket. The first controller is connected to the magnetic powder clutch via signal. The magnetic powder brake is located on one side of the feeding tray. The output shaft of the magnetic powder brake is connected to the rotating shaft of the feeding tray through a diaphragm coupling, and the output shaft of the magnetic powder brake and the rotating shaft of the feeding tray are coaxial. A third mounting bracket is installed on one side of the feeding tray for mounting the magnetic powder brake. The second controller is installed on one side of the feeding tray and is connected to the magnetic powder brake signal.

[0010] Furthermore, it also includes a first side plate and a second side plate, which are respectively disposed on one side of the receiving tray and the discharging tray. The first mounting bracket, the second mounting bracket, and the first controller are all fixedly connected to the first side plate, and the third mounting bracket and the second controller are all fixedly connected to the second side plate.

[0011] Furthermore, the first mounting frame includes multiple first support columns fixed to the first side plate and a first mounting plate fixed to the first support columns, and the servo motor is mounted on the first mounting plate; The second mounting bracket includes multiple second support columns fixed to the first side plate and a second mounting plate fixed to the second support columns, wherein the magnetic powder clutch is mounted on the second mounting plate; The third mounting bracket includes multiple third support columns fixed to the second side plate and a third mounting plate fixed to the third support columns, and the magnetic powder brake is mounted on the third mounting plate.

[0012] Furthermore, each of the first, second, and third support columns has two notches symmetrical about the central axis on its cylindrical surface in the circumferential direction; Bearings are installed on the first side plate, the second side plate, the first mounting plate, the second mounting plate, and the third mounting plate, respectively, for passing through the rotating shaft of the receiving tray, the rotating shaft of the discharging tray, the output shaft of the servo motor, the output shaft of the magnetic powder brake, and the output shaft of the magnetic powder clutch.

[0013] Furthermore, the servo motor is a digital display servo motor.

[0014] Furthermore, a base plate is fixedly connected to the lower end of both the first side plate and the second side plate in the horizontal direction, and reinforcing ribs are fixed between the first side plate, the second side plate and the corresponding base plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention adds a servo motor to the rotation center of the take-up tray. The servo motor can accurately execute and quickly respond to the torque commands calculated by the controller, thereby achieving high-precision and fast-response control of the take-up and unload process. When the roll diameter changes, or there is a sudden change in material tension, the output torque is quickly adjusted to dynamically maintain constant tension, avoid slack or breakage, and thus avoid slippage or excessive resistance. This improves the quality of handling, processing or transferring roll materials, while also increasing production speed.

[0016] In this invention, the diaphragm coupling has two sets of diaphragms. Compared to using a single set of diaphragms, using two sets of diaphragms can cope with offsets in different directions, thus achieving compensation in multiple directions, and the overall compensation capability is also stronger. Each set of diaphragms has a corrugated shape in its axial cross section. The corrugated structure allows the diaphragm to undergo more efficient and wider-range elastic deformation during axial tension / compression and angular deflection, while maintaining torsional rigidity. In other words, the corrugated diaphragm has better elasticity and compensation performance. In addition, the diaphragm coupling with corrugated diaphragms generates a smoother restoring force when compensating for offsets (especially in the angular direction), avoiding impact axial forces on the motor and load bearings. In addition, in this invention, the thickness of the diaphragm in the middle of the diaphragm coupling is less than that at the edge. The thin end has low stiffness to achieve flexibility compensation, while the thick end has high stiffness to maintain torque transmission capability. This achieves functional zoning. While ensuring the basic torque transmission function of the diaphragm coupling, the compensation capability of the diaphragm is improved as much as possible, further reducing the transmission of vibration and avoiding tension fluctuations caused by coaxiality errors, thereby achieving better control of the tension of the coiled material. Attached Figure Description

[0017] 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 these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a schematic diagram showing the installation of the receiving tray, the releasing tray, and the fine-tuning tension mechanism of the receiving and releasing tray rollers on both sides of the roll-to-roll processing equipment in this invention.

[0020] Figure 2This is a schematic diagram of the material receiving tray after the fine-tuning mechanism for the receiving and discharging rollers is installed.

[0021] Figure 3 For the present invention Figure 2 Enlarged diagram of point A in the middle.

[0022] Figure 4 This is a partial structural diagram of the fine-tuning mechanism for the feeding and receiving rollers in the present invention.

[0023] Figure 5 This is a three-dimensional schematic diagram of the diaphragm coupling in this invention.

[0024] Figure 6 This is a cross-sectional view of the diaphragm inside the diaphragm coupling of the present invention.

[0025] Illustrations: 1. First mounting frame; 101. First support column; 101a. Notch; 102. First mounting plate; 2. Servo motor; 3. Second mounting frame; 301. Second support column; 302. Second mounting plate; 4. Magnetic powder clutch; 5. Third mounting frame; 501. Third support column; 502. Third mounting plate; 6. Magnetic powder brake; 7. Diaphragm coupling; 701. Diaphragm; 8. First side plate; 9. Second side plate; 10. First controller; 11. Second controller; 12. Base plate; 13. Reinforcing rib; 14. Bearing; 15. Take-up tray; 16. Discharge tray; 17. Roll-to-roll processing equipment. Detailed Implementation

[0026] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, the receiving tray 15 and the unloading tray 16 are located at opposite ends of the roll-to-roll processing equipment 17, respectively, for receiving and unloading roll materials. The roll-to-roll processing equipment 17 refers to a type of continuous industrial manufacturing equipment. Its core operating mode involves continuously unrolling raw materials in roll form from one unloading tray 16, smoothly conveying them through one or more processing units for processing, and then re-collecting them into rolls at the other end by the receiving tray 15. Examples include coating machines, laminating machines, and foil rolling mills. Figure 2-3 As shown, the fine-tuning tension mechanism of the take-up and untake-up tray rollers described in this invention includes a first mounting frame 1, a servo motor 2, and a first controller 10. The first mounting frame 1 is mounted on one side of the take-up tray 15 and is used to mount the servo motor 2. The servo motor 2 is mounted on the first mounting frame 1, and its output shaft is connected to the take-up tray 15, with the output shaft of the servo motor 2 coaxial with the rotation axis of the take-up tray 15. The servo motor 2 is used to drive the take-up tray 15 to rotate. The first controller 10 is mounted on one side of the take-up tray 15 and is signal-connected to the servo motor 2, used to control the operation of the servo motor 2. The servo motor 2 can accurately execute and quickly respond to the torque commands calculated by the controller, achieving high-precision and fast-response control of the take-up and untake-up process. When the roll diameter changes, or there is a sudden change in material tension, the output torque is quickly adjusted to dynamically maintain constant tension, avoiding slack or breakage, thereby preventing slippage or excessive resistance, improving the quality of roll material handling, processing, or transfer, and simultaneously increasing production speed. The servo motor 2 described in this invention is a digital display servo motor. Using a digital display servo motor can realize data visualization. Through the digital display function, key parameters such as torque and speed are presented digitally in real time, which makes it easier for staff to make corresponding decisions based on the parameters and facilitates human-computer interaction.

[0030] In this invention, the output shaft of the servo motor 2 is connected to the rotating shaft of the take-up tray 15 via a diaphragm coupling 7. The diaphragm coupling 7 compensates for axial, radial, and angular misalignments, reduces vibration transmission, and avoids tension fluctuations caused by coaxiality errors. Combined with... Figures 5-6As shown, the diaphragm coupling 7 is equipped with two sets of diaphragms 701. Compared with a single set of diaphragms 701, using two sets of diaphragms 701 can cope with offsets in different directions, that is, achieve compensation in multiple directions, and the overall compensation capability is also stronger. Each set of diaphragms 701 has a corrugated shape in the axial section. The corrugated structure allows the diaphragm to undergo more efficient and wider range of elastic deformation during axial tension / compression and angular deflection, while maintaining torsional rigidity. That is, the corrugated diaphragm has better elasticity and better compensation performance. In addition, the diaphragm coupling 7 with corrugated diaphragms generates a smoother restoring force when compensating for offset (especially angular), avoiding impact axial forces on the motor and load bearings. In addition, in this invention, the thickness of the diaphragm 701 in the middle of the diaphragm coupling 7 is less than that at the edge. The thin end has low stiffness to achieve flexibility compensation, while the thick end has high stiffness to maintain torque transmission capability. This achieves functional zoning. While ensuring the basic torque transmission function of the diaphragm coupling 7, the compensation capability of the diaphragm is improved as much as possible, further reducing the transmission of vibration and avoiding tension fluctuations caused by coaxiality errors, thereby achieving better control of the tension of the coiled material.

[0031] Combination Figure 2-3 As shown, the fine-tuning mechanism for the take-up and feed tray rollers in this invention also includes a first side plate 8, which is disposed on one side of the take-up tray 15. The first mounting frame 1 and the first controller 10 are both fixedly connected to the first side plate 8. The first side plate 8 and the take-up tray 15 are rotatably connected. During operation, the first mounting frame 1 and the first side plate 8 remain stationary, while the take-up tray 15 rotates under the drive of the servo motor 2. The first mounting frame 1 includes multiple first support columns 101 fixed on the first side plate 8 and a first mounting plate 102 fixed to the first support columns 101. The servo motor 2 is mounted on the first mounting plate 102.

[0032] Combination Figure 2-4As shown, the fine-tuning tension mechanism of the take-up and untake-up tray rollers in this invention also includes a magnetic powder clutch 4, a magnetic powder brake 6, and a second controller 11. The magnetic powder clutch 4 is located between the servo motor 2 and the take-up tray 15. Both ends of the magnetic powder clutch 4 are connected to the rotating shaft of the take-up tray 15 and the output shaft of the servo motor 2 respectively through a diaphragm coupling 7. Similarly, the diaphragm coupling 7 is provided with two sets of diaphragms 701. Each set of diaphragms 701 has a corrugated shape in its axial cross section, and the thickness of the middle of the diaphragm 701 is less than the thickness of the edge. While ensuring the basic torque transmission function of the diaphragm coupling 7, the compensation capability of the diaphragm is improved as much as possible to further reduce the transmission of vibration and avoid tension fluctuations caused by coaxiality errors. A second mounting bracket 3 is installed on one side of the take-up tray 15, which is provided with the first mounting bracket 1. Specifically, the second mounting bracket 3 is fixedly connected to the first side plate 8, that is, the first mounting bracket 1 and the second mounting bracket 3 are installed on the same side of the take-up tray 15, so that the magnetic powder clutch 4 can be located between the servo motor 2 and the take-up tray 15. The second mounting bracket 3 includes multiple second support columns 301 fixed on the first side plate 8 and a second mounting plate 302 fixed to the second support columns 301. The magnetic powder clutch 4 is mounted on the second mounting plate 302.

[0033] The first controller 10 is connected to the magnetic powder clutch 4 via a signal and is used to control the operation of the magnetic powder clutch 4. A magnetic powder clutch 4 is installed between the servo motor 2 and the take-up tray 15. While transmitting torque, the magnetic powder clutch 4 can also provide mechanical overload protection. The magnetic powder clutch 4 has a torque limit set inside. When a sudden overload occurs, the two ends of the magnetic powder clutch 4 separate, physically limiting the maximum tension and preventing the roll from breaking due to excessive tension. The magnetic powder clutch 4 can absorb the impact of sudden speed changes, making the tension smoother. When the equipment stops suddenly or other sudden situations occur, the sudden change in winding speed will cause tension spikes. The magnetic powder layer inside the magnetic powder clutch will generate flexible damping, which can absorb the instantaneous impact energy and prevent the sudden speed change from directly impacting the material, thereby preventing the material from wrinkling or uneven tension. In addition, at ultra-low speed or zero speed, such as when changing rolls and pausing, the servo motor has difficulty maintaining a small tension precisely, and the roll is prone to loosening. The magnetic powder clutch still has residual holding torque at zero current, about 5~10% of the rated torque. That is, only a very small current (close to zero) is needed to maintain a constant weak tension and prevent the roll from slack and sagging. The cost is far lower than adding an additional mechanism.

[0034] The magnetic powder brake 6 of this invention is disposed on one side of the feeding tray 16. The output shaft of the magnetic powder brake 6 is connected to the rotation shaft of the feeding tray 16 via a diaphragm coupling 7, and the output shaft of the magnetic powder brake 6 and the rotation shaft of the feeding tray 16 are coaxially arranged. A third mounting bracket 5 is installed on one side of the feeding tray 16 for mounting the magnetic powder brake 6. The third mounting bracket 5 includes multiple third support columns 501 fixed on the second side plate 9 and a third mounting plate 502 fixed to the third support columns 501. The magnetic powder brake 6 is mounted on the third mounting plate 502. A second controller 11 is installed on one side of the feeding tray 16 and is signal-connected to the magnetic powder brake 6. The fine-tuning tension mechanism of the feeding tray roller of this invention also includes a second side plate 9, which is disposed on one side of the feeding tray 16. The third mounting bracket 5 and the second controller 11 are both fixedly connected to the second side plate 9. This invention adds a precise and controllable resistance source by setting a magnetic powder brake 6 on one side of the feeding tray 16. When the equipment starts, stops or accelerates rapidly, the inertial impact of the feeding roll can easily cause the material itself to break. The damping layer inside the magnetic powder brake 6 absorbs the impact energy, reduces the peak tension, and prevents the material from breaking due to instantaneous pulling. Similarly, the magnetic powder brake has excellent linearity in the low current region and can stably control micro-tension, so that the material is flat and wrinkle-free during the stopping process. In addition, even if the material breaks due to an accident, the magnetic powder brake 6 can lock in an emergency after detecting the material breakage to protect the material from scattering.

[0035] In this invention, each of the first support column 101, second support column 301, and third support column 501 has two symmetrical notches 101a on its cylindrical surface in the circumferential direction. By setting two notches 101a, the torque impact load is dispersed, avoiding single-point stress concentration at the root of the first support column 101 / second support column 301 / third support column 501. Setting symmetrical notches 101a actively creates controllable weak points, forcing the stress flow to bifurcate and detour, causing the high-stress area to migrate to the root of the notch and redistribute, thereby avoiding excessive stress concentration and increasing the service life of the first support column 101 / second support column 301 / third support column 501.

[0036] Bearings 14 are installed on the first side plate 8, the second side plate 9, the first mounting plate 102, the second mounting plate 302, and the third mounting plate 502, respectively, for passing through the rotating shaft of the receiving tray 15, the rotating shaft of the discharging tray 16, the output shaft of the servo motor 2, the output shaft of the magnetic powder brake 6, and the output shaft of the magnetic powder clutch 4. The arrangement of multiple bearings 14 reduces the friction between the rotating components of the receiving tray 15, the discharging tray 16, the servo motor 2, the magnetic powder brake 6, and the magnetic powder clutch 4 and the first side plate 8, the second side plate 9, the first mounting plate 102, the second mounting plate 302, and the third mounting plate 502. In this invention, the lower ends of the first side plate 8 and the second side plate 9 are both fixedly connected to the base plate 12 in the horizontal direction, so as to place / install the first side plate 8 and the second side plate 9 on the horizontal surface; and the first side plate 8, the second side plate 9 and the corresponding base plate 12 are fixedly connected to the reinforcing ribs 13, which increases the stability of the connection between the first side plate 8, the second side plate 9 and the corresponding base plate 12.

[0037] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fine-tuning tension mechanism for the feed tray rollers, characterized in that: include: The first mounting bracket (1) is installed on one side of the receiving tray (15) and is used to install the servo motor (2). Servo motor (2) is mounted on the first mounting bracket (1). The output shaft of servo motor (2) is connected to the rotation shaft of the receiving tray (15), and the output shaft of servo motor (2) and the rotation shaft of receiving tray (15) are coaxially arranged. The first controller (10) is installed on one side of the receiving tray (15) and is connected to the servo motor (2) via signal.

2. The fine-tuning tension mechanism for the feed tray rollers according to claim 1, characterized in that: The output shaft of the servo motor (2) is connected to the rotating shaft of the receiving tray (15) via a diaphragm coupling (7).

3. The fine-tuning tension mechanism for the feed tray rollers according to claim 2, characterized in that, The diaphragm coupling (7) is provided with two sets of diaphragms (701), and each set of diaphragms (701) is corrugated in the axial section.

4. The fine-tuning tension mechanism for the feed tray rollers according to claim 2, characterized in that, The thickness of the diaphragm (701) on the diaphragm coupling (7) is less than the thickness at the edges.

5. The fine-tuning tension mechanism for the feed tray rollers according to claim 1, characterized in that: It also includes a magnetic powder clutch (4), a magnetic powder brake (6), and a second controller (11); The magnetic powder clutch (4) is located between the servo motor (2) and the receiving tray (15). The two ends of the magnetic powder clutch (4) are connected to the rotating shaft of the receiving tray (15) and the output shaft of the servo motor (2) respectively through diaphragm couplings (7). A second mounting bracket (3) is installed on one side of the receiving tray (15) which is provided with the first mounting bracket (1). The first controller (10) is connected to the magnetic powder clutch (4) via signal. The magnetic powder brake (6) is located on one side of the feeding tray (16). The output shaft of the magnetic powder brake (6) is connected to the rotating shaft of the feeding tray (16) through a diaphragm coupling (7), and the output shaft of the magnetic powder brake (6) is coaxial with the rotating shaft of the feeding tray (16). A third mounting bracket (5) is installed on one side of the feeding tray (16) for mounting the magnetic powder brake (6). The second controller (11) is installed on one side of the feeding tray (16) and is connected to the magnetic powder brake (6) via signal.

6. The fine-tuning tension mechanism for the take-up and unload tray rollers according to claim 5, characterized in that: It also includes a first side plate (8) and a second side plate (9). The first side plate (8) and the second side plate (9) are respectively located on one side of the receiving tray (15) and the discharging tray (16). The first mounting bracket (1), the second mounting bracket (3), and the first controller (10) are all fixedly connected to the first side plate (8). The third mounting bracket (5) and the second controller (11) are all fixedly connected to the second side plate (9).

7. The fine-tuning tension mechanism for the take-up and unload tray rollers according to claim 6, characterized in that: The first mounting bracket (1) includes multiple first support columns (101) fixed on the first side plate (8) and a first mounting plate (102) fixed to the first support columns (101), and the servo motor (2) is mounted on the first mounting plate (102); The second mounting bracket (3) includes multiple second support columns (301) fixed on the first side plate (8) and a second mounting plate (302) fixed to the second support columns (301), and the magnetic powder clutch (4) is mounted on the second mounting plate (302); The third mounting bracket (5) includes multiple third support columns (501) fixed on the second side plate (9) and a third mounting plate (502) fixed to the third support columns (501). The magnetic powder brake (6) is mounted on the third mounting plate (502).

8. The fine-tuning tension mechanism for the feed tray rollers according to claim 7, characterized in that, On the cylindrical surface of each of the first support column (101), the second support column (301), and the third support column (501), there are two notches (101a) symmetrical about the central axis in the circumferential direction. Bearings (14) are installed on the first side plate (8), the second side plate (9), the first mounting plate (102), the second mounting plate (302), and the third mounting plate (502), respectively, for passing through the rotating shaft of the receiving tray (15), the rotating shaft of the discharging tray (16), the output shaft of the servo motor (2), the output shaft of the magnetic powder brake (6), and the output shaft of the magnetic powder clutch (4).

9. The fine-tuning tension mechanism for the take-up and unload tray rollers according to claim 1, characterized in that: The servo motor (2) is a digital display servo motor.

10. The fine-tuning tension mechanism for the feed tray rollers according to claim 6, characterized in that, The bottom end of the first side plate (8) and the second side plate (9) are both fixedly connected to the bottom plate (12) in the horizontal direction, and the first side plate (8), the second side plate (9) and the corresponding bottom plate (12) are fixed with reinforcing ribs (13).

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