A synchronous unwinding mechanism

Abstract

The application discloses a synchronous unwinding mechanism, characterized by comprising a rack, wherein a transmission assembly is installed on the rack; the transmission assembly comprises a power device and a feeding device; the power device comprises an output shaft and a first driving wheel; the feeding device comprises a driving roller, a first driven wheel and a second driving wheel, and the power device drives the driving roller through linkage of the first driven wheel and the first driving wheel; the unwinding mechanism comprises oppositely arranged side plates, wherein a guide groove and a connecting portion are arranged on each side plate; a hanging material rod is rotationally connected between the guide grooves, a pressing rod is rotationally connected between the connecting portions, a guide device for enabling the hanging material rod to slide towards the pressing rod is arranged on the guide groove, and the pressing rod has the same diameter as the driving roller; the pressing rod is connected with a second driven wheel, the second driven wheel is linked with the second driving wheel, and the second driving wheel has the same rotating speed as the second driven wheel. The application realizes synchronous feeding and unwinding, has the characteristics of simple structure, low cost and strong practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to material processing equipment, in particular to a synchronous unwinding mechanism. BACKGROUND

[0002] The unwinding mechanism is often used in automatic or semi-automatic production process, and the unwinding mechanism on the market at present is mostly directly manually fed to the conveying belt during feeding, and directly relies on the friction force between the material and the belt to pull the material. Since the material is wound together, a certain adhesive force is generated or the material is not a regular cylindrical body after being placed, resulting in uneven pulling force in the feeding (pulling) and weighing. In addition, the unwinding adopts a free state following mode, and when being stretched, the unwinding amount is often more than the feeding amount due to the inertia effect, and the feeding amount and the unwinding amount are out of synchronization. When the feeding speed of the material is faster than the unwinding speed, that is, the feeding amount is more than the unwinding amount, the material is easily deformed or even pulled and broken due to the thickness and hardness of the material; when the feeding speed of the material is slower than the unwinding speed, that is, the feeding amount is less than the unwinding amount, the unwinding amount is often too much to form material accumulation, even adhesion or falling and being contaminated, affecting the conveying requirements and quality. Some unwinding mechanisms use the rotating speed of the motor to control the unwinding speed, and cooperate with the controller, electromagnetic valve, cylinder, ultrasonic range finder and other detection devices to control the rewinding. However, this method often has a complex mechanism and high cost, and the pulling force applied to the material by the motor during unwinding is constant, and the pulling force required by different materials is certainly inconsistent. For some materials requiring small pulling force, if the pulling force is too large, the material may be damaged, and synchronous feeding and unwinding cannot be completely realized. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application aims to provide a synchronous unwinding mechanism for realizing synchronous feeding and unwinding, having the characteristics of simple structure, low cost and strong practicability.

[0004] The present application provides a synchronous unwinding mechanism, comprising:

[0005] a rack;

[0006] a transmission assembly installed on the rack, the transmission assembly comprising a power device and a feeding device; the power device comprising an output shaft and a first driving wheel, the first driving wheel being installed on the output shaft; the feeding device comprising a driving roller, a first driven wheel and a second driving wheel, the driving roller having a first end and a second end at both ends thereof, the first end being connected with the first driven wheel, the first driven wheel being linked with the first driving wheel, and the second driving wheel being connected to the second end;

[0007] The unwinding mechanism comprises a first side plate and a second side plate arranged oppositely, the first side plate and the second side plate are provided with guide grooves on opposite sides, and the guide grooves are provided with connecting portions at the ends;

[0008] A hanging rod is rotationally connected between the first side plate and the second side plate, the ends of the hanging rod are slidingly connected in the guide grooves, a guide device is arranged on the guide grooves, the guide device is used to drive the hanging rod to slide towards the connecting portion, and the hanging rod is circumferentially wound with materials for conveying;

[0009] A pressing rod is also rotationally connected between the first side plate and the second side plate, the pressing rod has the same diameter as the driving roller, the ends of the pressing rod are respectively formed with a third end portion and a fourth end portion, and the third end portion and the fourth end portion are arranged in the connecting portion; the third end portion is connected with a second driven wheel, the second driven wheel is linked with the second driving wheel, and the second driving wheel and the second driven wheel have the same rotating speed.

[0010] As a preferred embodiment, the guide device is a first guide end and a second guide end formed at the ends of the guide groove, the first guide end is higher than the second guide end in the direction of gravity, a transition section is formed between the first guide end and the second guide end, the connecting portion is arranged at the end of the second guide end, and the hanging rod slides from the first guide end to the second guide end through the transition section under the action of gravity, so as to exert pressure on the pressing rod.

[0011] As a preferred embodiment, the guide groove is a straight groove forming an angle of 45° with the direction of gravity.

[0012] As a preferred embodiment, the guide groove is a parabolic arc-shaped groove.

[0013] As a preferred embodiment, the second driving wheel and the second driven wheel are sprockets, and the second driving wheel and the second driven wheel are driven through a chain.

[0014] As a preferred embodiment, the second driving wheel and the second driven wheel are linked through two or more sprocket groups, and the sprocket groups are connected and driven through a gear group.

[0015] As a preferred embodiment, the gear set comprises a connecting plate, a driving gear, a driven gear, a second driven gear, a second driving gear, the connecting plate is rotationally connected with the driving gear and the driven gear, the driving gear is engaged with the driven gear, the driving gear is coaxially connected with the second driven gear, the driven gear is coaxially connected with the second driving gear, the second driven gear and the second driving gear are sprocket wheels, the second driving gear is linked with the second driven gear through a chain, and the second driving gear is linked with the second driven gear through a chain, so as to realize torque transmission between the second driving gear and the second driven gear.

[0016] As a preferred embodiment, the feeding device further comprises a driven roller, the axis of the driven roller is parallel to the axis of the driving roller, and the driven roller is rotationally connected to the frame; the driving roller and the driven roller are circumferentially sleeved with a transmission belt, and the driving roller drives the driven roller through the transmission belt.

[0017] As a preferred embodiment, the feeding device comprises a pressure adjusting roller, the pressure adjusting roller is rotationally connected above the driving roller, the axis of the pressure adjusting roller is parallel to the axis of the driving roller, and a feeding gap for material passing is formed between the pressure adjusting roller and the driving roller.

[0018] The end of the pressure adjusting roller is provided with an adjusting device, and the adjusting device can adjust the relative distance between the pressure adjusting roller and the driving roller.

[0019] As a preferred embodiment, the feeding device further comprises a rewinding mechanism, the rewinding mechanism comprises a rewinding rod, the rewinding rod is rotationally connected to the frame, and the rewinding mechanism further comprises a driving device for driving the rewinding rod to rotate.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1.The synchronous unwinding mechanism of the present application, by setting the driving power device, the output shaft of the power device is linked with the first driving wheel and the first driven wheel, the torque is transmitted to the driving roller, the driving roller rotates, and the feeding function is realized; the second driving wheel connected with the driving roller is linked with the second driven wheel, the torque is transmitted to the compression rod, and the unwinding function is realized; the material is wound on the hanging rod, the hanging rod slides from the first guide end to the second guide end through the transition section under the action of the guide device, the compression rod arranged between the connecting parts is compressed, the downward pressure is applied to the compression rod, the friction between the material and the compression rod is large, the material on the hanging rod will not cause too much material discharge or directly pull the material from the feeding end, causing the feeding to be interrupted, and the setting of the compression rod can also avoid the situation that the material is accumulated, adhered, dropped and polluted due to too fast unwinding inertia; by setting the diameter of the compression rod and the driving roller to be the same, and the rotating speed of the second driving wheel and the second driven wheel being the same, the linear speed of the driving roller and the compression rod is the same, that is, the feeding speed of the driving roller and the unwinding speed of the compression rod always remain consistent, avoiding the gradual change of the unwinding speed caused by the decreasing radius of the material roll due to the continuous material discharge and consumption in the prior art, and further ensuring the synchronous and uniform unwinding of the unwinding mechanism. Through the structure of the embodiment, the unwinding speed does not need to be controlled by the rotating speed of the motor, and the detection device such as the controller, the electromagnetic valve, the cylinder and the ultrasonic range finder can realize synchronous and uniform unwinding, the structure is simple, the cost is low, and the function is powerful.

[0022] 2.The synchronous unwinding mechanism of the present application, by setting the guide device as the first guide end and the second guide end formed at both ends of the guide groove, and the first guide end being higher than the second guide end in the direction of gravity, a transition section is formed between the first guide end and the second guide end, the hanging rod is driven by gravity to apply downward pressure to the compression rod; the gravity is reasonably utilized, the structure is simple, and the energy is saved.

[0023] 2.The synchronous unwinding mechanism of the present application, by setting the guide groove as a parabolic arc-shaped groove, as the diameter of the unwinding material roll becomes smaller and smaller, the horizontal displacement becomes smaller and smaller, and the vertical displacement becomes larger and larger accordingly; so that the unwinding material roll is continuously unwound, the material is continuously reduced, the downward pressure applied by the hanging rod to the compression rod is also continuously reduced, and the friction between the two will also change; by setting the guide groove as a parabolic arc-shaped groove, the downward inclination of the hanging rod is gradually increased, the gravity loss due to the reduction of the material is compensated, the downward pressure is maintained constant, the unwinding friction is kept stable, and the synchronous and uniform unwinding of the unwinding mechanism is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the synchronous unwinding mechanism of the present application;

[0025] Figure 2Another angle view of the structure of the synchronous playback roll mechanism of the present application;

[0026] Figure 3 A sectional view of the synchronous playback roll mechanism of the present application;

[0027] Figure 4 A front view of the synchronous playback roll mechanism of the present application;

[0028] Figure 5 A partial enlarged view of part B of the synchronous playback roll mechanism of the present application;

[0029] Figure 6 A schematic view of the internal structure of the synchronous playback roll mechanism of the present application;

[0030] Figure 7 Another angle view of the internal structure of the synchronous playback roll mechanism of the present application;

[0031] Figure 8 A schematic view of one embodiment of the guide slot of the synchronous playback roll mechanism of the present application;

[0032] Figure 9 A schematic view of another embodiment of the guide slot of the synchronous playback roll mechanism of the present application;

[0033] Figure 10 A front view of another embodiment of the guide slot of the synchronous playback roll mechanism of the present application;

[0034] Figure 11 A partial enlarged view of part A of the synchronous playback roll mechanism of the present application.

[0035] In the figure: 100, frame; 200, transmission assembly; 210, power device; 211, first driving wheel; 220, feeding device; 230, driving roller; 231, first driven wheel; 232, second driving wheel; 240, driven roller; 250, pressure adjusting roller; 251, adjusting device; 252, adjusting hole; 253, adjusting rod; 260, transmission belt; 300, unwinding mechanism; 310, material; 320, hanging material rod; 330, pressure rod; 331, second driven wheel; 332, third end; 333, fourth end; 341, first side plate; 342, second side plate; 350, guide slot; 351, first guide end; 352, second guide end; 353, transition section; 354, connecting part; 400, gear set; 410, connecting plate; 420, driving gear; 421, second driven wheel; 430, driven gear; 431, second driving wheel; 500, winding mechanism; 510, fifth end; 511, third driven wheel; 520, winding rod. DETAILED DESCRIPTION

[0036] Hereinafter, the application will be further described in conjunction with the drawings and specific embodiments, it should be noted that, in the absence of conflict, the following described embodiments or technical features between each can be combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in the embodiments can be purchased from the market. Examples of embodiments are shown in the drawings, in which the same or similar reference numbers represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended only to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0038] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or connected through an intermediate medium, or the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] Embodiment one:

[0041] Referring to Figures 1-11 A synchronous unwinding mechanism, comprising a rack 100, a transmission assembly 200 and an unwinding mechanism 300;

[0042] The rack 100 has a certain bearing capacity and plays a fixed supporting and protective role for each part of the synchronous unwinding mechanism;

[0043] The transmission assembly 200 is installed on the rack 100, and the transmission assembly 200 comprises a power device 210 and a feeding device 220.

[0044] The power device 210 provides driving force for the operation of the synchronous unwinding mechanism, and the power device 210 can be one of a stepper motor and a servo motor; the power device 210 comprises an output shaft and a first driving wheel 211, and the first driving wheel 211 is connected to the output shaft.

[0045] The feeding device 220 comprises a driving roller 230, a first driven wheel 231 and a second driving wheel 232, the driving roller 230 has a first end and a second end, the first end is connected to the first driven wheel 231, and the first driven wheel 231 is linked with the first driving wheel 211; the second end is connected with the second driving wheel 232.

[0046] The unwinding mechanism 300 comprises oppositely arranged first and second side plates 341 and 342, and the first and second side plates 341 and 342 are provided with guide grooves 350 on opposite sides; the guide grooves 350 are provided with connecting portions 354 at the ends.

[0047] The first and second side plates 341 and 342 are rotatably connected with a material hanging rod 320, and the material hanging rod 320 is circumferentially wound with a material 310 for conveying; the two ends of the material hanging rod 320 are slidably connected in the guide grooves 350, and the guide grooves 350 are provided with guide devices for driving the material hanging rod 320 to slide to the connecting portions 354.

[0048] Specifically, the guide grooves 350 are formed with first and second guide ends 351 and 352 at the two ends, the first guide end 351 is higher than the second guide end 352 in the direction of gravity, and a transition section 353 is formed between the first and second guide ends 351 and 352, and the material hanging rod 320 slides from the first guide end 351 to the second guide end 352 through the transition section 353 under the action of gravity; of course, in addition to using gravity to make the material hanging rod 320 slide to the second guide end 352, other guide devices can also be used, such as a motor driving the material hanging rod 320 to slide to the second guide end 352, or installing a tension spring, etc., to avoid excessive impact force, which can be understood by those skilled in the art.

[0049] The first and second side plates 341 and 342 are also rotatably connected with a pressing rod 330, the pressing rod 330 has the same diameter as the driving roller 230, and the pressing rod 330 is formed with third and fourth ends 332 and 333 at the two ends, and the third and fourth ends 332 and 333 are arranged at the connecting portions 354 of the first and second side plates 341 and 342, respectively; the third end 332 is connected with a second driven wheel 331, the second driven wheel 331 is linked with the second driving wheel 232, and the second driving wheel 232 and the second driven wheel 331 have the same rotational speed.

[0050] The driving power device 210, the power device 210 output shaft through the first driving wheel 211 and the first driven wheel 231 linkage, the torque is transmitted to the driving roller 230, the driving roller 230 rotates, realizes the feeding function; through the second driving wheel 232 connected with the driving roller 230 and the second driven wheel 331 linkage, the torque is transmitted to the compression rod 330, realizes the unwinding function;

[0051] The material 310 is wound on the material hanging rod 320, the material hanging rod 320 slides from the first guide end 351 to the second guide end 352 through the transition section 353 under the action of gravity, the compression rod 330 arranged between the connecting portions 354 is compressed, the compression rod 330 is applied with a downward pressure, a greater friction force is realized between the material 310 and the compression rod 330, the material 310 on the material hanging rod 320 will not cause too much material discharge or directly pull the material from the feeding end due to the unwinding inertia, resulting in the interruption of feeding, since the compression rod 330 and the driving roller 230 have the same diameter, the transmission ratio of the second driving wheel 232 and the second driven wheel 331 is 1:1, the linear speed of the driving roller 230 and the compression rod 330 is the same, that is, the feeding speed of the driving roller 230 and the unwinding speed of the compression rod 330 always remain consistent, avoiding the gradual change of the unwinding speed caused by the decreasing radius of the material 310 due to the continuous material discharge in the prior art, further ensuring the synchronous and uniform unwinding of the unwinding mechanism 300.

[0052] Specifically, the linkage between the first driven wheel 231 and the first driving wheel 211 can be realized by a gear set, a chain wheel, a belt wheel or a combination thereof; in the embodiment, the first driving wheel 211 and the first driven wheel 231 are synchronous belt wheels, the first driving wheel 211 and the first driven wheel 231 are driven by a synchronous belt, which has the advantages of accurate transmission ratio, small shaft force, compact structure and the like.

[0053] In some embodiments, the second driving wheel 232 and the second driven wheel 331 are chain wheels, and the second driving wheel 232 and the second driven wheel 331 are driven by a chain; the chain transmission can provide a larger transmission distance, and has accurate transmission ratio and high transmission efficiency.

[0054] In other embodiments, the second driving wheel 232 and the second driven wheel 331 are linked by multiple sets of sprockets, and the sprocket sets are connected by a gear set 400. In this embodiment, the gear set 400 includes a connecting plate 410, on which a driving gear 420 and a driven gear 430 are rotatably connected. The driving gear 420 is coaxially connected to a second driven wheel 421, and the driven gear 430 is coaxially connected to a second driving wheel 431. Both the second driven wheel 421 and the second driving wheel 431 are sprockets. The second driving wheel 232 is linked with the second driven wheel 421 through a chain, transmitting torque to the driving gear 420. The driving gear 420 drives the driven gear 430 through meshing, thereby transmitting torque to the second driving wheel 232. The second driving wheel 232 is linked with the second driven wheel 331 through a chain, thereby realizing the torque transmission between the second driving wheel 232 and the second driven wheel 331. The above structure can maximize the distance between the second driving wheel 232 and the second driven wheel 331, and achieve high transmission efficiency and stable transmission.

[0055] like Figure 8 In one embodiment of the guide groove 350 shown, the guide groove 350 is a straight groove forming a 45° angle with the direction of gravity. The 45° inclined straight line facilitates the smooth sliding of the hanging rod 320 in the guide groove 350 and makes the structure of the synchronous unwinding mechanism more compact.

[0056] like Figures 9-10 In another embodiment of the guide groove 350 shown, the guide groove 350 is arc-shaped. Specifically, as the diameter of the unwound material roll decreases, its lateral displacement decreases, while its longitudinal displacement increases accordingly, similar to the parabolic principle, and is designed as an arc. As the unwound material roll continues to move, the material 310 also decreases, thus the downward pressure applied by the hanging rod 320 and the pressing rod 330 also decreases, and the friction between them will also change. By setting the guide groove 350 as arc-shaped, the gradual increase in the downward inclination of the hanging rod 320 compensates for the weight loss due to the reduction of material 310, maintains a constant downward pressure, and thus maintains the stability of the unwound friction.

[0057] In some embodiments, the feeding device 220 further comprises a driven roller 240, the axis of the driven roller 240 is parallel to the axis of the driving roller 230, and specifically, the driven roller 240 is a movable roller with two ends fastened to the rack 100 and a middle rod part rotatable; the driving roller 230 and the driven roller 240 are circumferentially sleeved with a conveying belt 260, the driving roller 230 is driven, the driven roller 240 is driven by the conveying belt 260, and the linkage of the driving roller 230 and the driven roller 240 is realized. By arranging the driven roller 240, the material 310 first passes through the driven roller 240 and then is brought to the driving roller 230 by the conveying belt 260, which greatly increases the contact area of the feeding device 220 and the material 310, improves the feeding efficiency, reduces the friction loss, and through the arrangement of the driven roller 240, the material 310 is straightened and aligned in advance, and the unwinding quality is improved.

[0058] The feeding device 220 further comprises a pressure adjusting roller 250, the pressure adjusting roller 250 is rotatably connected above the driving roller 230, the axis of the pressure adjusting roller 250 is parallel to the axis of the driving roller 230, and the pressure adjusting roller 250 and the driving roller 230 form a feeding gap for the material 310 to pass through; the end of the pressure adjusting roller 250 is provided with an adjusting device 251, the relative distance between the pressure adjusting roller 250 and the driving roller 230 can be adjusted by the adjusting device 251, so as to adjust the feeding gap, thereby controlling the friction of the material 310 on the conveying belt 260 and controlling the feeding tension; in the present embodiment, the pressure adjusting roller 250 is also arranged above the driven roller 240, and the feeding tension is further adjusted.

[0059] The adjusting device 251 comprises an adjusting hole 252 and an adjusting rod 253, the adjusting hole 252 is arranged at the end of the pressure adjusting roller 250, the adjusting rod 253 is fixed to the rack 100, and the adjusting hole 252 and the adjusting rod 253 are threadedly matched or buckled matched, so as to realize the movement of the end of the pressure adjusting roller 250 on the adjusting rod 253; the adjusting device 251 can further be provided with a locking device to lock the end of the pressure adjusting roller 250 on the adjusting rod 253 to avoid loosening.

[0060] In some preferred embodiments, a rewinding mechanism 500 is further arranged, the rewinding mechanism 500 comprises a rewinding rod 520, the end of the rewinding rod 520 forms a fifth end part 510 and a sixth end part, the fifth end part 510 and the sixth end part are rotatably connected to the rack 100, and the rewinding mechanism 500 further comprises a driving device for driving the rotation of the rewinding rod 520.

[0061] The driving device is a third driven wheel 511 connected to the fifth end 510, and the third driven wheel 511 can be provided as a belt pulley; the fourth end 333 of the pressing rod 330 is connected with a belt pulley, and the two belt pulleys are circumferentially sleeved with a belt. The pressing rod 330 drives the rewinding rod 520 to rewind the material film through the belt and the belt pulley, so as to realize synchronous operation of unwinding and rewinding. By transmitting torque in the form of a belt drive, when the material 310 tension is too large during rewinding, the belt pulley and the belt slip to release the pressure, thereby avoiding damage to the material 310 and protecting the machine.

[0062] In addition to the above belt drive arrangement, the driving device can also be arranged to be driven by a motor or other driving form alone, combined with a sensing device, which starts the motor to rewind the rewinding rod 520 when it senses that the material 310 film is loose. This case can not be synchronized with unwinding, but it ensures that the film rewinding will not be loose or fall off.

[0063] Although only some parts and embodiments of the present application have been illustrated and described, many modifications and changes (for example, changes in the size, dimension, structure, shape and proportion of various elements, mounting arrangement, material use, color, orientation, etc.) can be made by those skilled in the art without departing from the scope and spirit of the claims.

[0064] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A synchronous unwinding mechanism, characterized in that, include: frame; A transmission assembly is mounted on the frame and includes a power unit and a feeding device. The power unit includes an output shaft and a first drive wheel, with the first drive wheel mounted on the output shaft. The feeding device includes a drive roller, a first driven wheel, and a second drive wheel. The drive roller has a first end and a second end formed at its two ends. The first end is connected to the first driven wheel, which is linked to the first drive wheel. The second drive wheel is connected to the second end. An unwinding mechanism, comprising a first side plate and a second side plate disposed opposite to each other, wherein a guide groove is provided on the opposite side of the first side plate and the second side plate, and a connecting part is provided at the end of the guide groove; A hanging rod is rotatably connected between the first side plate and the second side plate. The two ends of the hanging rod are slidably connected to the guide groove. A guide device is provided on the guide groove. The guide device is used to drive the hanging rod to slide towards the connecting part. The guide device is a tension spring. Material for conveying is circumferentially wound on the hanging rod. A clamping rod is rotatably connected between the first side plate and the second side plate. The clamping rod has the same diameter as the drive roller. The clamping rod has a third end and a fourth end formed at its two ends. The third end and the fourth end are respectively disposed at the connecting part. A second driven wheel is connected to the third end. The second driven wheel is linked with the second drive wheel. The second drive wheel and the second driven wheel rotate at the same speed. The guiding device consists of a first guiding end and a second guiding end formed at both ends of a guide groove. The first guiding end is higher than the second guiding end in the direction of gravity. A transition section is formed between the first guiding end and the second guiding end. The connecting part is located at the end of the second guiding end. Under the action of gravity, the hanging rod slides from the first guiding end through the transition section to the second guiding end, thereby applying pressure to the clamping rod. The guide groove is a parabolic arc groove. The parabolic arc groove causes the hanging rod to gradually increase its downward tilt as the diameter of the unwound material roll continuously decreases. The feeding device also includes a driven roller, the axis of which is parallel to the axis of the driving roller, and the driven roller is rotatably connected to the frame; a transmission belt is circumferentially sleeved on the driving roller and the driven roller, and the driving roller drives the driven roller through the transmission belt; The feeding device includes a pressure adjusting roller, which is rotatably connected above the drive roller. The pressure adjusting roller is parallel to the axis of the drive roller, and a feeding gap is formed between the pressure adjusting roller and the drive roller to allow material to pass through. The end of the pressure adjusting roller is provided with an adjustment device, which can adjust the relative distance between the pressure adjusting roller and the drive roller; A pressure adjustment roller is also installed above the driven roller; The adjustment device includes an adjustment hole and an adjustment rod. The adjustment hole is located at the end of the pressure adjustment roller, and the adjustment rod is fixed to the frame. The adjustment hole and the adjustment rod are engaged by a snap-fit, thereby enabling the end of the pressure adjustment roller to move on the adjustment rod. The adjustment device is also equipped with a locking device, which locks the end of the pressure adjustment roller to the adjustment rod to prevent loosening. The second driving wheel and the second driven wheel are sprockets, and the second driving wheel and the second driven wheel are driven by a chain. The second driving wheel and the second driven wheel are linked by two or more sets of sprockets, and the sprocket sets are connected and driven by gear sets. The gear set includes a connecting plate, a driving gear, a driven gear, a second driven gear, and a second driving gear. The connecting plate is rotatably connected to the driving gear and the driven gear, and the driving gear meshes with the driven gear. The driving gear is coaxially connected to the second driven gear, and the driven gear is coaxially connected to the second driving gear. Both the second driven gear and the second driving gear are sprockets. The second driving gear is linked to the second driven gear via a chain, and the second driving gear is linked to the second driven gear via a chain, thereby realizing torque transmission between the second driving gear and the second driven gear.

2. The synchronous unwinding mechanism according to claim 1, characterized in that, It also includes a rewinding mechanism, which includes a rewinding rod rotatably connected to the frame. The rewinding mechanism also includes a drive device for driving the rewinding rod to rotate.

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