Raw material changing and receiving device for hygienic products

Abstract

The utility model relates to a raw material changing and receiving device for hygienic products. Comprising a feeding roller, a material preparing roller, material guiding assemblies and a discharging roller set which are connected to a back plate, the two material guiding assemblies are oppositely arranged, and a material guiding channel is formed between the two material guiding assemblies; heat sealing heads and cutting heads which are movably connected are arranged on a fixed seat of the material guiding assembly, the two groups of heat sealing heads correspond to the two groups of cutting heads, and the two groups of heat sealing heads are connected in a material guiding channel in an abutting manner; a film material on the feeding roller sequentially passes through the fixing base, the cutting head, the heat sealing head and the material guiding channel and then is wound on the discharging roller set, and a film material on the material preparing roller passes through the fixing base, the cutting head and the heat sealing head and then enters the material guiding channel. When the feeding roller is used for discharging, the roller can be preassembled on the material preparation roller, when a film material on the feeding roller is about to be used up, the film material on the feeding roller is compounded on a film material on the material preparation roller, and then the film material is cut, so that continuous discharging can be realized, and meanwhile, sufficient time is provided for replacing the roller; the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sanitary product production equipment, and particularly relates to a material changing and connecting device for raw materials of sanitary products. Background Art

[0002] In the current production of sanitary products, especially in the production of sanitary napkins, at the beginning of production, fabric lamination needs to be carried out for the bottom film layer. In order to achieve batch production, it is carried out in the form of feeding. Along with the operation of the production line, cutting and lamination are carried out, so that the production efficiency is improved. However, since the released fabric is fed through a roller, the capacity of each roller is limited and it is impossible to continuously feed along with the operation of the production line all the time. After using up one roller, the equipment needs to be stopped and a new roller needs to be installed before the equipment can operate again. During the process of changing the roller, production time will be consumed, resulting in a reduction in production efficiency. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a material changing and connecting device for raw materials of sanitary products. By setting a feeding roller and a standby roller, when the feeding roller feeds materials, a roller can be pre-installed on the standby roller. When the film material on the feeding roller is about to be used up, by laminating the film material on the feeding roller to the film material on the standby roller and then cutting, continuous feeding can be achieved, and at the same time, there is sufficient time to change the roller, improving the production efficiency.

[0004] To achieve the above object, the technical solution adopted by the utility model is:

[0005] A material changing and connecting device for raw materials of sanitary products includes a feeding roller, a standby roller, a material guiding component and a discharging roller group connected to a back plate. The material guiding component includes two groups, and the two groups of material guiding components are arranged oppositely and form a material guiding channel therebetween; on the fixing seat of the material guiding component, there are movably connected a heat sealer and a cutting head, and the two groups of heat sealers and cutting heads correspond to each other, and the two groups of heat sealers can be in butt-joint connection in the material guiding channel; the film material on the feeding roller sequentially passes through the fixing seat, the cutting head, the heat sealer and the material guiding channel and then winds around the discharging roller group, and the film material on the standby roller enters the material guiding channel after passing through the fixing seat, the cutting head and the heat sealer.

[0006] The material guiding assembly further includes a first cylinder and a second cylinder disposed on the fixed seat. The output end of the first cylinder is connected to the hot sealing head, and the output end of the second cylinder is connected to the cutting head. The material guiding assembly further includes a lower guide roller, an upper guide roller, a motor, and a third cylinder. The lower guide roller is rotatably connected to the lower end of the fixed seat. The third cylinder is disposed on the upper end of the fixed seat, and the output end of the third cylinder is connected to the upper guide roller. The upper guide roller is driven by the third cylinder to be in abutting connection with the lower guide roller. The motor is disposed on the fixed seat and drives the upper guide roller to rotate. The film material on the feeding roller sequentially passes between the upper guide roller and the lower guide roller, the cutting head, the hot sealing head, and the material guiding channel and then is wound around the discharging roller group. The film material on the material preparation roller passes between the upper guide roller and the lower guide roller, the cutting head, and the hot sealing head and then enters the material guiding channel.

[0007] The discharging roller group includes a buffer member and a discharging member. The buffer member includes a rotating plate, a buffer roller, and a servo motor. The rotating plate is rotatably connected to the back plate. The buffer roller is rotatably connected to the rotating plate. The servo motor is disposed on the back plate and drives the rotating plate to rotate. The discharging member includes a fixing plate and a discharging roller. The fixing plate is connected to the back plate. The discharging roller is rotatably connected to the fixing plate. The film material on the feeding roller that enters the discharging roller group first winds around the discharging roller and then winds around the buffer roller.

[0008] For the sanitary product raw material changing and feeding device adopting this structure, the two material guiding assemblies have the same structure and are symmetrically arranged left and right. There is a material guiding channel for the film material to pass between the two material guiding assemblies. The feeding roller and the material preparation roller provided on the back plate respectively lead out the film material to pass through the material guiding assembly and enter the material guiding channel. The film material on the feeding roller extends downward and enters the discharging roller group to be compounded in the production line. The material preparation roller is used to pre-install the roller for standby. After the film material on the feeding roller is used up, the material preparation roller continues to feed the material to maintain the continuity of feeding.

[0009] In order to achieve continuous material discharge, when the film material on the feed roller is about to run out, the film material on the preparation roller needs to be connected to the film material on the feed roller and the film material on the feed roller needs to be cut off. Therefore, a heat sealing head and a cutting head are arranged on the fixed seat of the material guide assembly. The two sets of heat sealing heads are arranged opposite to each other and abut against each other. The film material on the preparation roller first passes through the cutting head and then enters the interval where the heat sealing heads are located and is kept on standby. When the film material on the feed roller is about to run out, the rotation of the feed roller is stopped to stop the discharge of the film material, and the first cylinder is driven to make the two sets of heat sealing heads approach and abut against each other, so that the film material on the feed roller is hot-melted to the film material on the preparation roller, completing the bonding between each other. As a result, the film material on the feed roller is used up, and the second cylinder on this end of the feed roller is driven to make the cutting head move forward and abut against the film material on the feed roller, and the film material on the feed roller is cut off by heating and fusing, so that the film material on the preparation roller and the remaining film material wrapped on the discharge roller group form a coherent whole, ensuring continuous material discharge. After the cutting is completed, the feed roller can be replaced manually. Since it takes a certain amount of time for the film material on the preparation roller to be used up, there is sufficient time for the workers to replace it. When the film material on the preparation roller is used up, the same operation is repeated to replace the discharged film material to the feed roller.

[0010] The upper guide roller is located above the film material and is driven to rotate by a motor. At the same time, the upper guide roller can be separated from or abutted against the lower guide roller by the setting of the third cylinder. Therefore, when driving the film material to be discharged, the upper guide roller can be driven for transmission. When replacing the preparation roller, the film material on the preparation roller can be inserted between the upper guide roller and the lower guide roller. The film material is driven by the drive of the upper guide roller and passes through the cutting head and the heat sealing head in turn into the material guide. In order to ensure that the film material is no longer driven to extend after entering the material guide, an induction probe can be provided below the heat sealing head to stop discharging when the film material is sensed to pass through.

[0011] Since replacing the stock preparation roller requires completely stopping the discharge of the feeding roller, which means that the film material on the discharge roller group also needs to stop feeding, this will cause the entire production line to also need to completely stop to cooperate with the replacement of the stock preparation roller, seriously affecting the overall production progress. Therefore, a buffer member and a discharge member are provided on the discharge roller group. The buffer member is rotatably connected to the back plate through a rotating plate, and the rotating plate is driven to rotate by a servo motor. A buffer roller is provided on the rotating plate, and the discharge member is that the discharge roller is connected to the back plate through a fixing plate. The film material discharged from the feeding roller first winds around the discharge roller after passing through the guiding component, then winds around the buffer roller, and finally is led out and enters the production line for lamination. Then, when it is necessary to replace the film material on the stock preparation roller, first, the feeding roller is forced to stop rotating by a brake or other means, and the upper guiding roller also stops rotating synchronously, so that the film material on the feeding roller completely stops feeding. At this time, the rotating plate slowly rotates towards the fixing plate under the drive of the servo motor, so that the film material wound around the discharge roller and the buffer roller can be fed at the original speed, without affecting the production progress. At this time, the heat sealer heat-seals and fuses the two groups of film materials, and the cutting head cuts the film material on the feeding roller. After completing the sequential operations, the drive of the servo motor is stopped, and at the same time, the upper guiding roller is rotated to discharge the film material on the stock preparation roller at the original feeding speed. At this time, the transmission speed on the upper guiding roller can be slightly increased, and the servo motor is driven to rotate the rotating plate away from the fixing plate, so that a certain length of film material can be stored between the buffer roller and the discharge roller for use in the next replacement.

[0012] Further, the buffer roller and the discharge roller include several groups. The several buffer rollers are arranged in an array on the rotating plate, and the several discharge rollers are arranged in an array on the fixing plate. The film material entering the discharge roller group from the feeding roller winds back and forth between each group of discharge rollers and buffer rollers in turn.

[0013] Compared with the prior art, the advantages of the present utility model are as follows: Through the setting of the heat sealer and the cutting head on the guiding component, the film material on the feeding roller is heat-sealed and fused with the film material that has entered the guiding channel on the stock preparation roller when it is about to be used up, and is cut off by the cutting head, so that the film material on the stock preparation roller and the remaining film material wound around the discharge roller group form a continuous whole, ensuring continuous feeding. In order to avoid the complete stop of the feeding of the film material during the replacement process, a buffer member and a discharge member are provided on the discharge roller group to store the feeding film material between the buffer roller and the discharge roller. During the replacement, the rotating plate slowly rotates towards the fixing plate under the drive of the servo motor, so that the film material wound around the discharge roller and the buffer roller can be fed at the original speed, without affecting the production progress. After the replacement, the film material between the buffer roller and the discharge roller is re-stored for use in the next replacement. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0015] Figure 1 Is a perspective view of the present invention;

[0016] Figure 2 Is a top view of the present invention;

[0017] Figure 3 Is of the present invention Figure 2 A-A cross-sectional view;

[0018] Figure 4 Is of the present invention Figure 3 Partial enlarged view at B;

[0019] Figure 5 Is of the present invention Figure 3 Partial enlarged view at C.

[0020] Wherein: 1, back plate; 2, feeding roller; 3, stock preparation roller; 4, guiding component; 41, fixed seat; 42, heat sealer; 43, cutting head; 44, first cylinder; 45, second cylinder; 46, lower guiding roller; 47, upper guiding roller; 48, motor; 49, third cylinder; 5, discharging roller group; 51, buffer member; 511, rotating plate; 512, buffer roller; 513, servo motor; 52, discharging member; 521, fixing plate; 522, discharging roller; 6, guiding channel; 7, film material. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0022] The following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings:

[0023] Such as Figures 1-5As shown in the figure, a material changing device for raw materials of sanitary products includes a feeding roller 2, a stockpiling roller 3, a material guiding assembly 4, and a discharging roller group 5 connected to a back plate 1. The material guiding assembly 4 includes two groups, and the two groups of the material guiding assemblies 4 are arranged oppositely and form a material guiding channel 6 therebetween. A heat sealing head 42 and a cutting head 43 which are movably connected are provided on a fixed seat 41 of the material guiding assembly 4. The two heat sealing heads 42 and the cutting heads 43 correspond to each other, and the two heat sealing heads 42 are configured to be in abutting connection within the material guiding channel 6. The film material 7 on the feeding roller 2 sequentially passes through the fixed seat 41, the cutting head 43, the heat sealing head 42, and the material guiding channel 6 and then winds around the discharging roller group 5. The film material 7 on the stockpiling roller 3 enters the material guiding channel 6 after passing through the fixed seat 41, the cutting head 43, and the heat sealing head 42.

[0024] The material guiding assembly 4 further includes a first air cylinder 44 and a second air cylinder 45 provided on the fixed seat 41. An output end of the first air cylinder 44 is connected to the heat sealing head 42, and an output end of the second air cylinder 45 is connected to the cutting head 43. The material guiding assembly 4 further includes a lower guiding roller 46, an upper guiding roller 47, a motor 48, and a third air cylinder 49. The lower guiding roller 46 is rotatably connected to a lower end of the fixed seat 41. The third air cylinder 49 is provided on an upper end of the fixed seat 41. An output end of the third air cylinder 49 is connected to the upper guiding roller 47. The upper guiding roller 47 is driven by the third air cylinder 49 to be in abutting connection with the lower guiding roller 46. The motor 48 is provided on the fixed seat 41 and drives the upper guiding roller 47 to rotate. The film material 7 on the feeding roller 2 sequentially passes between the upper guiding roller 47 and the lower guiding roller 46, the cutting head 43, the heat sealing head 42, and the material guiding channel 6 and then winds around the discharging roller group 5. The film material 7 on the stockpiling roller 3 enters the material guiding channel 6 after passing between the upper guiding roller 47 and the lower guiding roller 46, the cutting head 43, and the heat sealing head 42.

[0025] The discharging roller group 5 includes a buffer member 51 and a discharging member 52. The buffer member 51 includes a rotating plate 511, a buffer roller 512, and a servo motor 513. The rotating plate 511 is rotatably connected to the back plate 1. The buffer roller 512 is rotatably connected to the rotating plate 511. The servo motor 513 is provided on the back plate 1 and drives the rotating plate 511 to rotate. The discharging member 52 includes a fixing plate 521 and a discharging roller 522. The fixing plate 521 is connected to the back plate 1. The discharging roller 522 is rotatably connected to the fixing plate 521. The film material 7 on the feeding roller 2 that enters the discharging roller group 5 first winds around the discharging roller 522 and then winds around the buffer roller 512.

[0026] Furthermore, the buffer roller 512 and the discharge roller 522 include several groups, several of the buffer rollers 512 are distributed in an array on the rotating plate 511, and several of the discharge rollers 522 are distributed in an array on the fixed plate 521, and the film material 7 entering the discharge roller group 5 on the feed roller 2 is wound back and forth between each group of discharge rollers 522 and the buffer roller 512 in turn.

[0027] Description of the working method of this utility model:

[0028] The raw material exchange device for sanitary products adopts this structure, and the two groups of material guide components 4 have the same structure and are symmetrical on the left and right. A material guide channel 6 for film material 7 to pass through is provided between the two groups of material guide components 4. The feed roller 2 and the preparation roller 3 provided on the back plate 1 each lead the film material 7 through the material guide component 4 and enter the material guide channel 6. The film material 7 of the feed roller 2 continues to extend downward and enters the discharge roller group 5, and enters the production line for compounding. The preparation roller 3 is used to install the roller in advance for standby. After the film material 7 on the feed roller 2 is used up, the preparation roller 3 is used to continue to discharge the material to maintain the continuity of the discharge.

[0029] In order to achieve continuous material discharge, when the film material 7 on the feed roller 2 is about to run out, the film material 7 on the preparation roller 3 needs to be connected to the film material 7 on the feed roller 2 and the film material 7 on the feed roller 2 needs to be cut off. Therefore, a heat sealing head 42 and a cutting head 43 are arranged on the fixed seat 41 of the material guide assembly 4. The two groups of heat sealing heads 42 are arranged opposite to each other and abut against each other. The film material 7 on the preparation roller 3 first passes through the cutting head 43 and then enters the interval where the heat sealing head 42 is located and is kept on standby. When the film material 7 on the feed roller 2 is about to run out, the rotation of the feed roller 2 is stopped to stop the discharge of the film material 7, and the first cylinder 44 is driven to make the two groups of heat sealing heads 42 approach and abut against each other, so that the film material 7 on the feed roller 2 is hot-melted on the film material 7 on the preparation roller 3, and the film material 7 on the feed roller 2 is completed. The film material 7 on the feed roller 2 is bonded to each other. Since the film material 7 on the feed roller 2 is used up, the second cylinder 45 on this end of the feed roller 2 is driven to make the cutting head 43 advance forward and abut against the film material 7 on the feed roller 2, and the film material 7 on the feed roller 2 is cut off by heating and melting, so that the film material 7 on the preparation roller 3 and the remaining film material 7 wound on the discharge roller group 5 form a coherent whole, ensuring continuous material discharge. After the cutting is completed, the feed roller 2 can be replaced manually. Since it takes a certain amount of time for the film material 7 on the preparation roller 3 to be used up, there is sufficient time for the workers to replace it. When the film material 7 on the preparation roller 3 is used up, repeat the same operation to replace the discharged film material 7 to the feed roller 2.

[0030] Since the film material 7 runs at a high speed in the material guiding channel 6 during the feeding process, if the film material 7 on the standby material roller 3 is to be extended into the material guiding channel 6 for standby after replacing the standby material roller 3 at this time, there will be certain danger when placing it manually. Therefore, a lower guide roller 46 and an upper guide roller 47 are arranged on the fixed seat 41. The lower guide roller 46 is located below the film material 7 and is in a driven state, and the upper guide roller 47 is located above the film material 7 and is driven to rotate by the motor 48. At the same time, the upper guide roller 47 can be separated from or abutted against the lower guide roller 46 by the arrangement of the third air cylinder 49. Therefore, when driving the film material 7 to feed, it can be driven by the upper guide roller 47. When replacing the standby material roller 3, the film material 7 on the standby material roller 3 can be inserted between the upper guide roller 47 and the lower guide roller 46, and the film material 7 is driven by the upper guide roller 47 to be transmitted and passes through the cutting head 43 and the heat sealer 42 in sequence and then enters the material guiding channel 6. In order to ensure that the film material 7 will not be driven to extend after just entering the material guiding channel 6, an induction probe can be arranged below the heat sealer 42 to stop feeding when it senses that the film material 7 passes through.

[0031] Since replacing the standby material roller 3 requires completely stopping the feeding of the feeding roller 2, which means that the film material 7 on the discharge roller group 5 also needs to stop feeding, this will cause the entire production line to also need to stop completely to cooperate with the replacement of the standby material roller 3, seriously affecting the overall production progress. Therefore, a buffer member 51 and a discharge member 52 are arranged on the discharge roller group 5. The buffer member 51 is rotatably connected to the back plate 1 through a rotating plate 511, and the rotating plate 511 is driven to rotate by a servo motor 513. A buffer roller 512 is arranged on the rotating plate 511, and the discharge member 52 is that the discharge roller 522 is connected to the back plate 1 through a fixing plate 521. The film material 7 discharged from the feeding roller 2 first winds around the discharge roller 522 after passing through the material guiding assembly 4, then winds around the buffer roller 512, and finally is exported to enter the production line for lamination. Then when the film material 7 on the standby material roller 3 needs to be replaced, first force the feeding roller 2 to stop rotating through a brake or other means, and the upper guide roller 47 also stops rotating synchronously, so that the film material 7 on the feeding roller 2 completely stops feeding. At this time, the rotating plate 511 slowly rotates towards the direction of the fixing plate 521 driven by the servo motor 513, so that the film material 7 wound around the discharge roller 522 and the buffer roller 512 can continue to feed at the original speed without affecting the production progress. At this time, the heat sealer 42 heat-seals and fuses the two groups of film materials 7, and the cutting head 43 cuts the film material 7 on the feeding roller 2. After completing the sequential operations, stop the drive of the servo motor 513, and at the same time, with the rotation of the upper guide roller 47, discharge the film material 7 on the standby material roller 3 at the original feeding speed. At this time, the transmission speed on the upper guide roller 47 can be slightly increased, and cooperate with the servo motor 513 to drive the rotating plate 511 to rotate away from the fixing plate 521, so that a certain length of film material 7 can be stored between the buffer roller 512 and the discharge roller 522 for use in the next replacement.

[0032] Due to the fast compounding speed on the production line, the film material 7 stored on a single set of buffer rollers 512 and discharge rollers 522 will be used up in a short time during replacement. If the operations of heat sealing and cutting are not completed after the reserved film material 7 is used up, it will cause the film material 7 to be directly pulled and broken, affecting the production progress. Therefore, a number of buffer rollers 512 distributed in an array are provided on the rotating plate 511, and a number of discharge rollers 522 distributed in an array are also provided on the fixed plate 521. The film material 7 winds back and forth between the discharge rollers 522 and the buffer rollers 512, which can effectively extend the reserved film material 7 and avoid the possibility of the film material 7 being pulled and broken due to insufficient reserved film material 7.

[0033] The beneficial effects of the present utility model are as follows: Through the setting of the heat sealing head 42 and the cutting head 43 on the material guiding assembly 4, the film material 7 on the feeding roller 2 is heat-sealed and fused with the film material 7 that has entered the material guiding channel 6 on the stock roller 3 when it is about to be used up, and is cut off by the cutting head 43, so that the film material 7 on the stock roller 3 and the remaining film material 7 wound around the discharge roller group 5 form a continuous whole, ensuring continuous feeding. In order to avoid the complete stop of the feeding of the film material 7 during the replacement process, a buffer member 51 and a discharge member 52 are provided on the discharge roller group 5, and the feeding film material 7 is reserved between the buffer roller 512 and the discharge roller 522. During replacement, the rotating plate 511 slowly rotates towards the fixed plate 521 driven by the servo motor 513, so that the film material 7 wound around the discharge roller 522 and the buffer roller 512 can be fed at the original speed without affecting the production progress. After the replacement is completed, the film material 7 between the buffer roller 512 and the discharge roller 522 is re-reserved for use in the next replacement.

[0034] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A raw material exchange device for sanitary products, characterized in that: It includes a feed roller, a preparation roller, a material guide assembly and a discharge roller group connected to the back plate, the material guide assembly includes two groups, the two groups of material guide assemblies are arranged opposite to each other and form a material guide channel between them; a movably connected heat sealing head and a cutting head are provided on the fixed seat of the material guide assembly, the two groups of heat sealing heads and the cutting heads correspond to each other, and the two groups of heat sealing heads are abutted and connected in the material guide channel; the film material on the feed roller passes through the fixed seat, the cutting head, the heat sealing head and the material guide channel in sequence and then is wound around the discharge roller group, and the film material on the preparation roller passes through the fixed seat, the cutting head and the heat sealing head and then enters the material guide channel; The material guiding assembly further comprises a first cylinder and a second cylinder arranged on a fixed seat, wherein an output end of the first cylinder is connected to a heat sealing head, and an output end of the second cylinder is connected to a cutting head; The material guiding assembly also includes a lower guide roller, an upper guide roller, a motor and a third cylinder. The lower guide roller is rotatably connected to the lower end of the fixed seat, the third cylinder is arranged at the upper end of the fixed seat, the output end of the third cylinder is connected to the upper guide roller, and the upper guide roller is abutted against the lower guide roller under the drive of the third cylinder. The motor is arranged on the fixed seat and drives the upper guide roller to rotate; the film material on the feed roller passes through the upper guide roller and the lower guide roller, the cutting head, the heat sealing head and the material guiding channel in sequence, and then is wound around the discharge roller group, and the film material on the preparation roller passes through the upper guide roller and the lower guide roller, the cutting head and the heat sealing head, and then enters the material guiding channel.

2. The raw material exchange device for sanitary products according to claim 1, characterized in that: The discharging roller group includes a buffer component and a discharging component, the buffer component includes a rotating plate, a buffer roller and a servo motor, the rotating plate is rotatably connected to the back plate, the buffer roller is rotatably connected to the rotating plate, the servo motor is arranged on the back plate and drives the rotating plate to rotate; the discharging component includes a fixed plate and a discharging roller, the fixed plate is connected to the back plate, and the discharging roller is rotatably connected to the fixed plate; the film material on the feed roller entering the discharging roller group is first wound around the discharging roller and then wound around the buffer roller.

3. The raw material exchange device for sanitary products according to claim 2, characterized in that: The buffer rollers and discharge rollers include several groups, several of the buffer rollers are distributed in an array on the rotating plate, and several of the discharge rollers are distributed in an array on the fixed plate. The film material entering the discharge roller group from the feed roller is wound back and forth between each group of discharge rollers and buffer rollers in turn.

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