Combined fiber web feeding machine
The combined fiber web feeding machine addresses issues of fiber web expansion and damage by compressing and clamping the web with a 'V'-shaped space and traction feeding, enhancing transportation efficiency and product quality.
Patent Information
- Application Number
- CN202420940581.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-04
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-04
AI Technical Summary
Existing fiber web feeding mechanisms in pre-puncture machines result in fiber web expansion, leading to increased conveying resistance, uneven feeding, and fiber damage due to large groove rollers and annular web guides, which compromises the quality of the finished product.
A combined fiber web feeding machine with a clamping feeding device and traction feeding device, utilizing a 'V'-shaped space to compress and clamp the fiber web, followed by traction feeding rollers to prevent expansion and ensure smooth transportation, minimizing resistance and draft rate.
The solution effectively prevents fiber web blockage and expansion, ensuring smooth transportation and improved product quality by reducing contact with rollers and using carbon curtains for anti-static properties.
Smart Images
Figure CN222249384U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of nonwoven mechanical equipment, in particular to a combined fiber web feeding machine. Background Art
[0002] like Figure 3 As shown, the clamping feeding device of the existing pre-puncture machine generally includes a frame 1, a fiber web conveying mechanism and a power mechanism. The above-mentioned fiber web conveying mechanism and power mechanism are both installed on the frame 1, and the power mechanism is connected to the fiber web conveying mechanism in a transmission manner. The fiber web conveying mechanism generally includes an upper annular clamping curtain 2, a lower annular clamping curtain 3, an upper groove roller 4, a lower groove roller 5, an upper active roller 6, a lower active roller 7, an upper tensioning roller 8 and a lower tensioning roller 9. Both ends of the upper and lower groove rollers 4, 5 and the upper and lower active rollers 6, 7 and the upper and lower tensioning rollers 8, 9 can be rotatably installed on the frame 1. The upper tensioning roller 8 is located at the upper rear of the upper active roller 6, and the lower tensioning roller 9 is located at the lower rear of the lower active roller 7; the upper annular clamping curtain 2 is tensioned on the upper active roller 6 and the upper tensioning roller 8. The upper and lower annular clamping curtains 3 are tensioned on the lower active roller 7 and the lower tensioning roller 9, and a backward-falling "V"-shaped space 10 is formed between the upper annular clamping curtain 2 and the lower annular clamping curtain 3. The distance between the upper and lower annular clamping curtains 2 and 3 at the inlet of the backward-falling "V"-shaped space 10 is relatively large, and the distance between the upper and lower annular clamping curtains 2 and 3 at the outlet of the backward-falling "V"-shaped space 10 is relatively small. The upper groove roller 4 and the lower groove roller 5 are installed at the outlet of the backward-falling "V"-shaped space 10. The power mechanism generally includes a motor 11, and the motor 11 is synchronously driven and connected with the upper and lower active rollers 6 and 7 and the upper and lower groove rollers 4 and 5.
[0003] When the fiber web enters the "V"-shaped space 10 between the upper and lower annular clamping curtains 2 and 3, the fiber web is transported backward to between the upper and lower grooved rollers 4 and 5 through the cooperation of the upper and lower annular clamping curtains 2 and 3, and then transported backward to the needle plate of the pre-needling machine by the upper grooved roller 4 and the lower grooved roller 5.
[0004] The diameter of the upper and lower groove rollers 4, 5 is generally about 215 mm. At the same time, the upper and lower groove rollers 4, 5 are generally embedded with an annular web guide sheet 12 to further improve the ability of the upper and lower groove rollers 4, 5 to transport the fiber web.
[0005] Since the diameters of the upper and lower groove rollers 4 and 5 are relatively large, and the distance between the nip points of the upper and lower groove rollers 4 and 5 and the first row of needles of the pre-puncture machine is generally about 120 mm, the fiber web will expand after leaving the nip points of the upper and lower groove rollers 4 and 5. Therefore, when the fiber web is fed into the pre-puncture machine, the fiber web conveying distance is long and the conveying resistance is large, resulting in a large traction rate and uneven feeding. At the same time, since the upper and lower groove rollers 4 and 5 are generally embedded with annular mesh guides 12, the fibers of the fiber web are easily scratched and damaged, thereby reducing the quality of the finished product. Utility Model Content
[0006] The technical problem to be solved by the utility model is to provide a combined fiber web feeder, which can compress the multi-layer fiber web output by the web laying machine and effectively prevent the occurrence of blockage due to the rebound expansion of the fiber web, thereby improving the quality of the finished product. The technical solution adopted is as follows:
[0007] A combined fiber web feeding machine comprises a frame and a clamping feeding device, the clamping feeding device comprises a fiber web conveying mechanism and a power mechanism, the fiber web conveying mechanism and the power mechanism are both mounted on the frame, and the power mechanism is connected to the fiber web conveying mechanism in a transmission manner; the fiber web conveying mechanism comprises an upper annular transmission assembly and a lower annular transmission assembly, the lower annular transmission assembly is arranged below the upper annular transmission assembly, and a "V"-shaped space that falls backward is formed between the lower annular transmission assembly and the upper annular transmission assembly; the characteristic is that the combined fiber web feeding machine also comprises a traction feeding device, the traction feeding device is mounted on the frame and is located behind the clamping feeding device, the traction feeding device comprises two traction feeding rollers that are arranged side by side and rotate relatively up and down, and the gap between the two traction feeding rollers constitutes a fiber web feeding inlet; the rear end of the lower annular transmission assembly and the rear end of the upper annular transmission assembly both extend between the two traction feeding rollers, and the gap between the rear end of the lower annular transmission assembly and the rear end of the upper annular transmission assembly is directly opposite to the fiber web feeding inlet.
[0008] The combined fiber web feeding machine is composed of a clamping feeding device and a traction feeding device. The clamping feeding device first compresses and clamps the multi-layer fiber web output by the web laying machine through a "V"-shaped space and then moves the fiber web to the fiber web feeding port of the traction feeding device. The fiber web is then clamped and compressed by two traction feeding rollers of the traction feeding device and transported backward. After being compacted and held, the fiber web is fed to the needle punching area of the pre-puncture machine. The fiber web conveying mechanism forms a backward "V"-shaped space between the lower annular conveying component and the upper annular conveying component, and the rear ends of the lower annular conveying component and the upper annular conveying component are both extended into the fiber web feeding port of the traction feeding device, so that the angle of the "V"-shaped space (or triangular area) formed in front of the fiber web feeding port is very small, thereby compressing the multi-layer fiber web output by the web laying machine and effectively preventing the occurrence of blockage due to the rebound and expansion of the fiber web, so that the fiber web conveying process is quite smooth, and its resistance is small and the draft rate is small, thereby improving the quality of the finished product.
[0009] As a preferred embodiment of the utility model, the upper annular transmission component includes an upper active roller, an upper support roller, an upper feeding roller and an upper annular clamping curtain, the upper active roller, the upper support roller and the upper feeding roller can be rotatably installed on the frame, the upper annular clamping curtain is tensioned by the upper active roller, the upper support roller and the upper feeding roller, and the upper annular clamping curtain has an upper clamping section that gradually tilts downward from front to back and a lower return section above it; the lower annular transmission component includes a lower active roller, a lower support roller, a lower feeding roller and a lower annular clamping curtain, the lower active roller, the lower support roller, the lower The feeding rollers are all rotatably mounted on the frame, the lower annular clamping curtain is tensioned by the lower active roller, the lower support roller and the lower feeding roller, the lower annular clamping curtain has a lower clamping section that gradually tilts upward from front to back and an upper return section below it; the upper feeding roller and the lower feeding roller are both arranged between the two traction feeding rollers and are located in front of the fiber web feeding inlet; the upper active roller and the lower active roller are both connected to the power output end of the power mechanism by transmission; the "V"-shaped space is formed between the upper clamping section of the upper annular clamping curtain and the lower clamping section of the lower annular clamping curtain. When working, the upper active roller and the lower active roller rotate under the drive of the power mechanism, and then drive the upper annular clamping curtain and the lower annular clamping curtain to move along their running directions respectively, and use the upper clamping section of the upper annular clamping curtain and the lower clamping section of the lower annular clamping curtain to compress and clamp the fiber web and then approach the fiber web feeding inlet. Since the upper annular clamping curtain wraps up the upper active roller, the upper support roller and the upper feeding roller, and the lower annular clamping curtain wraps up the lower active roller, the lower support roller and the lower feeding roller; the upper annular clamping curtain is under the tension of the upper active roller, the upper support roller and the upper feeding roller, and the lower annular clamping curtain is under the tension of the lower active roller, the lower support roller and the lower feeding roller, a backward-inverted "V"-shaped space is formed between the upper annular clamping curtain and the lower annular clamping curtain. After passing through the "V"-shaped space, the fiber web reaches the fiber web feeding entrance, and is then clamped and compressed by two traction feeding rollers and transported backward. During the transmission process of the fiber web, the fiber web always contacts only with the upper annular clamping curtain or the lower annular clamping curtain, and does not contact with the roller, so the surface and uniformity of the fiber web are not damaged.
[0010] As a further preferred embodiment of the present invention, the diameter of the lower feeding roller and the diameter of the upper feeding roller are at most 0.1 times the diameter of the traction feeding roller. More preferably, the diameter of the lower feeding roller and the diameter of the upper feeding roller are 0.05-0.08 times the diameter of the traction feeding roller. Specifically, the diameter of the traction feeding roller is 155 mm, and the diameter of the lower feeding roller and the diameter of the upper feeding roller are both 10 mm. This makes it easier to install the lower feeding roller and the upper feeding roller at a position closer to the fiber web feeding port, so that the angle of the "V"-shaped space (or triangle area) formed in front of the fiber web feeding port is smaller.
[0011] As a further preferred solution of the utility model, the upper annular clamping curtain and the lower annular clamping curtain are both carbon curtains. Since the carbon curtain has the advantages of anti-static and non-sticky fibers, the ability of the clamping feeding device to transport the fiber web can be greatly improved.
[0012] The power mechanism may include a motor and a chain transmission mechanism, and the motor is synchronously connected to the upper active roller and the lower active roller through the chain transmission mechanism. A tensioning wheel may be installed between the motor and the upper active roller and the lower active roller to enhance the driving ability of the motor to the upper active roller and the lower active roller.
[0013] In order to prevent the upper annular clamping curtain or the lower annular clamping curtain from being offset during the conveying process, an automatic correcting device is provided on the upper annular clamping curtain and the lower annular clamping curtain. The automatic correcting device includes a correcting mechanism and a correcting stroke detector. The correcting mechanism includes a correcting roller, a cylinder, a bearing, a bearing seat and a slide groove. The rotating shaft of the correcting roller is installed on the bearing seat through a bearing, the slide groove is fixed on the frame, the bearing seat can be slidably installed in the slide groove, the piston rod of the cylinder is connected to the bearing seat, the correcting roller is pressed against the upper annular clamping curtain or the lower annular clamping curtain (a limiting component is respectively provided on both sides of the correcting roller, and the fiber web feeding entrance or the lower annular clamping curtain is between the two limiting components), and the correcting roller has not only a correcting effect but also a tensioning effect on the upper annular clamping curtain or the lower annular clamping curtain; the correcting stroke detector is installed on the frame above the two side edges of the upper annular clamping curtain or the lower annular clamping curtain, and the correcting stroke detector is connected to the cylinder through a controller. In this way, the automatic deviation-correcting device can prevent the upper annular clamping curtain or the lower annular clamping curtain from deviating, thereby ensuring that the upper annular clamping curtain and the lower annular clamping curtain can transport the fiber web stably and accurately.
[0014] As a further preferred solution of the utility model, the upper feeding roller and the lower feeding roller are respectively mounted on the frame via a tripod, the tripod is mounted on the frame, and the upper feeding roller and the lower feeding roller are respectively rotatably mounted on the rear end of the corresponding tripod. Specifically, the rear end of the tripod is an acute angle and is arranged toward the fiber web feeding inlet. This makes it easier to install the lower feeding roller and the upper feeding roller at a position closer to the fiber web feeding inlet, and can play a tensioning role on the front end of the upper annular clamping curtain or the lower annular clamping curtain to prevent it from interfering with the rotation of the two traction feeding rollers.
[0015] As a preferred solution of the utility model, the roller surface of the traction feeding roller is provided with a plurality of annular grooves arranged in sequence and at equal distances along its axial direction, thereby improving the ability of the two traction feeding rollers to transport the fiber web.
[0016] As a further preferred embodiment of the utility model, a web guide is installed on the annular groove. Specifically, the web guide can be made of nylon material, thereby further improving the ability of the two traction feed rollers to transport the fiber web.
[0017] Compared with the prior art, the utility model has the following advantages:
[0018] This combined fiber web feeding machine is composed of a clamping feeding device and a traction feeding device. The clamping feeding device first compresses and clamps the multi-layer fiber web output by the web laying machine through a "V"-shaped space and then brings it close to the fiber web feeding port of the traction feeding device. The two traction feeding rollers of the traction feeding device clamp and compress it and transport it backward. After being compacted and held, it is fed into the needle punching area of the pre-puncture machine. The clamping feeding device can form a "V"-shaped space with a very small angle in front of the fiber web feeding port, thereby compressing the multi-layer fiber web output by the web laying machine and effectively preventing the occurrence of blockage due to the rebound and expansion of the fiber web, so that the transportation process of the fiber web is quite smooth, and its resistance and draft rate are small, thereby improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of a combined fiber web feeding machine according to a preferred embodiment of the utility model.
[0020] Figure 2 yes Figure 1 Enlarged view of point A.
[0021] Figure 3 It is a structural schematic diagram of a clamping feeding device of an existing pre-piercing machine. DETAILED DESCRIPTION
[0022] like Figure 1-Figure 2As shown, the combined fiber web feeding machine comprises a frame 1, a traction feeding device 2 and a clamping feeding device 3; the traction feeding device 2 comprises two traction feeding rollers 21 arranged side by side and relatively rotating, and the gap between the two traction feeding rollers 21 constitutes a fiber web feeding port 201; the clamping feeding device 3 comprises a fiber web conveying mechanism 31 and a power mechanism 32, both of which are mounted on the frame 1, and the power mechanism 32 is connected to the fiber web conveying mechanism 31 in transmission; the clamping feeding device 3 is arranged in front of the traction feeding device 2, and the fiber web conveying mechanism 31 comprises an upper annular transmission component 311 and a lower annular transmission component 322. The lower annular conveying assembly 312 is arranged below the upper annular conveying assembly 311. The upper annular conveying assembly 311 includes an upper active roller 3111, an upper support roller 3112, an upper feeding roller 3113 and an upper annular clamping curtain 3114. The upper active roller 3111, the upper support roller 3112 and the upper feeding roller 3113 are all rotatably mounted on the frame 1. The upper annular clamping curtain 3114 is tensioned by the upper active roller 3111, the upper support roller 3112 and the upper feeding roller 3113. The upper annular clamping curtain 3114 has an upper pinching section 31141 which is gradually inclined downward from front to back and is located above it. The lower annular conveying assembly 312 comprises a lower active roller 3121, a lower supporting roller 3122, a lower feeding roller 3123 and a lower annular clamping curtain 3124. The lower active roller 3121, the lower supporting roller 3122 and the lower feeding roller 3123 are all rotatably mounted on the frame 1. The lower annular clamping curtain 3124 is tensioned by the lower active roller 3121, the lower supporting roller 3122 and the lower feeding roller 3123. The lower annular clamping curtain 3124 has a lower pinching section 31241 which is gradually inclined upward from front to back and an upper return section 31242 thereunder; the upper feeding roller 3113, the lower feeding roller 3123 and the lower feeding roller 3124 are all rotatably mounted on the frame 1. The lower annular clamping curtain 3124 is tensioned by the lower active roller 3121, the lower supporting roller 3122 and the lower feeding roller 3123. The rollers 3123 are arranged between the two traction feeding rollers 21 and are located in front of the fiber web feeding entrance 201; the upper active roller 3111 and the lower active roller 3121 are both transmission connected to the power output end of the power mechanism 32; a backward-inverted "V"-shaped space 10 is formed between the upper clamping section 31141 of the upper annular clamping curtain 3114 and the lower clamping section 31241 of the lower annular clamping curtain 3124, and the rear ends of the upper clamping section 31141 and the lower clamping section 31241 both extend between the two traction feeding rollers 21, and the gap between the rear ends of the upper clamping section 31141 and the lower clamping section 31241 is directly opposite to the fiber web feeding entrance 201.
[0023] In this embodiment, the diameter of the traction feeding roller 21 is 155 mm, and the diameters of the lower feeding roller 3123 and the upper feeding roller 3113 are both 10 mm. This makes it easier to install the lower feeding roller 3123 and the upper feeding roller 3113 closer to the fiber web feeding port 201, so that the angle of the "V"-shaped space 10 formed in front of the fiber web feeding port 201 is smaller.
[0024] In this embodiment, the upper annular clamping curtain 3114 and the lower annular clamping curtain 3124 are carbon curtains. Since the carbon curtain has the advantages of anti-static and non-sticky fibers, the ability of the clamping feeding device 3 to transport the fiber web can be greatly improved.
[0025] In this embodiment, the power mechanism 32 includes an upper motor 321, an upper chain transmission mechanism 322, a lower motor 323 and a lower chain transmission mechanism 324. The upper motor 321 and the lower motor 323 are both installed on the frame 1. The upper motor 321 is connected to the upper active roller 3111 through the upper chain transmission mechanism 322, and the lower motor 323 is connected to the lower active roller 3121 through the lower chain transmission mechanism 324.
[0026] In order to prevent the upper annular clamping curtain 3114 or the lower annular clamping curtain 3124 from being offset during the conveying process, in the present embodiment, an automatic deviation correcting device 325 is provided on the upper annular clamping curtain 3114 and the lower annular clamping curtain 3124. The automatic deviation correcting device 325 includes a deviation correcting mechanism and a deviation correcting stroke detector. The deviation correcting mechanism includes a deviation correcting roller, a cylinder, a bearing, a bearing seat and a slide groove. The rotating shaft of the deviation correcting roller is installed on the bearing seat through a bearing. The slide groove is fixed on the frame 1. The bearing seat can be slidably installed in the slide groove. The piston rod of the cylinder and the shaft The support is connected, and the deviation correction roller is pressed against the upper annular clamping curtain 3114 or the lower annular clamping curtain 3124 (a limiting component is provided on both sides of the deviation correction roller, and the fiber web feeding port 201 or the lower annular clamping curtain 3124 is located between the two limiting components). The deviation correction roller not only has a deviation correction function but also a tensioning function on the upper annular clamping curtain 3114 or the lower annular clamping curtain 3124; the deviation correction stroke detector is installed on the frame 1 above the two sides of the upper annular clamping curtain 3114 or the lower annular clamping curtain 3124, and the deviation correction stroke detector is connected to the cylinder through a controller. In this way, the automatic deviation correction device 325 can prevent the upper annular clamping curtain 3114 or the lower annular clamping curtain 3124 from running off, thereby ensuring that the upper annular clamping curtain 3114 and the lower annular clamping curtain 3124 can transport the fiber web smoothly and accurately.
[0027] In this embodiment, the upper feeding roller 3113 and the lower feeding roller 3123 are respectively installed on the frame 1 through a tripod 33, and the tripod 33 is installed on the frame 1. The upper feeding roller 3113 and the lower feeding roller 3123 are respectively rotatably installed on the rear end of the corresponding tripod 33.
[0028] In this embodiment, the roller surface of the traction feeding roller 21 is provided with a plurality of annular grooves (not shown) distributed in sequence along the axial direction thereof, and a web guide 22 is installed on the annular groove, and the web guide 22 is made of nylon material. This can further improve the web conveying capacity of the two traction feeding rollers 21.
[0029] The following is a brief description of the working principle of this combined fiber web feeding machine:
[0030] During operation, the multi-layer fiber web output by the web laying machine is first compressed and clamped by the clamping feeding device 3 and conveyed backward. The upper active roller 3111 and the lower active roller 3121 of the clamping feeding device 3 rotate under the drive of the power mechanism 32, and then drive the upper annular clamping curtain 3114 and the lower annular clamping curtain 3124 to move along their running directions respectively. The "V"-shaped space 10 formed by the upper clamping section 31141 of the upper annular clamping curtain 3114 and the lower clamping section 31241 of the lower annular clamping curtain 3124 is used to compress and clamp the multi-layer fiber web output by the web laying machine, and transmit it to the fiber web feeding entrance 201 of the traction feeding device 2. Then, the two traction feeding rollers 21 of the traction feeding device 2 make relative rotation motion, clamp and compress the fiber web and convey it backward, and feed it into the needle punching area of the pre-puncture machine after compaction and gripping.
[0031] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The technical personnel of the technical field to which the utility model belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.
Claims
1. A combined fiber web feeder, comprising a frame and a clamping feeding device, the clamping feeding device comprising a fiber web conveying mechanism and a power mechanism, the fiber web conveying mechanism and the power mechanism are both mounted on the frame, the power mechanism is in driving connection with the fiber web conveying mechanism; the fiber web conveying mechanism comprises an upper annular conveying assembly and a lower annular conveying assembly, the lower annular conveying assembly is arranged below the upper annular conveying assembly, a backward-inverted "V"-shaped space is formed between the lower annular conveying assembly and the upper annular conveying assembly; the characteristics are: The combined fiber web feeding machine also includes a traction feeding device, which is installed on the frame and located behind the clamping feeding device. The traction feeding device includes two traction feeding rollers that are arranged side by side and rotate relatively to each other. The gap between the two traction feeding rollers constitutes a fiber web feeding inlet; the rear end of the lower annular conveying component and the rear end of the upper annular conveying component both extend between the two traction feeding rollers, and the gap between the rear end of the lower annular conveying component and the rear end of the upper annular conveying component is opposite to the fiber web feeding inlet.
2. A combined web feeding machine according to claim 1, characterized in that: The upper annular transmission assembly includes an upper active roller, an upper support roller, an upper feeding roller and an upper annular clamping curtain, which are all rotatably mounted on the frame, and the upper annular clamping curtain is tensioned by the upper active roller, the upper support roller and the upper feeding roller, and the upper annular clamping curtain has an upper clamping section that gradually tilts downward from front to back and a lower return section above it; the lower annular transmission assembly includes a lower active roller, a lower support roller, a lower feeding roller and a lower annular clamping curtain, and the lower active roller, the lower support roller and the lower feeding roller are all rotatably mounted on the frame, and the upper annular clamping curtain is tensioned by the upper active roller, the upper support roller and the upper feeding roller, and the upper annular clamping curtain has an upper clamping section that gradually tilts downward from front to back and a lower return section above it; the lower annular transmission assembly includes a lower active roller, a lower support roller, a lower feeding roller and a lower annular clamping curtain, and the lower active roller, the lower support roller and the lower feeding roller are all The lower annular clamping curtain is rotatably mounted on the frame, and is tensioned by a lower active roller, a lower supporting roller and a lower feeding roller. The lower annular clamping curtain comprises a lower clamping section which is gradually inclined upward from front to back and an upper return section below the lower annular clamping curtain; the upper feeding roller and the lower feeding roller are both arranged between the two traction feeding rollers and are located in front of the fiber web feeding port; the upper active roller and the lower active roller are both transmission-connected to the power output end of the power mechanism; the "V"-shaped space is formed between the upper clamping section of the upper annular clamping curtain and the lower clamping section of the lower annular clamping curtain.
3. A combined web feeding machine according to claim 2, characterized in that: The diameter of the lower feeding roller and the diameter of the upper feeding roller are at most 0.1 times the diameter of the traction feeding roller.
4. A combined web feeding machine according to claim 3, characterized in that: The diameter of the lower feeding roller and the diameter of the upper feeding roller are 0.05-0.08 times the diameter of the traction feeding roller.
5. A combined web feeding machine according to claim 2, characterized in that: The upper feeding roller and the lower feeding roller are respectively installed on the frame through a tripod, the tripod is installed on the frame, and the upper feeding roller and the lower feeding roller are respectively rotatably installed on the rear end of the corresponding tripod.
6. A combined web feeding machine according to claim 2, characterized in that: The upper annular clamping curtain and the lower annular clamping curtain are both made of carbon curtains.
7. A combined web feeder according to any one of claims 1 to 6, characterized in that: The roller surface of the traction feeding roller is provided with a plurality of annular grooves which are arranged in sequence and at equal intervals along the axial direction thereof.
8. A combined web feeding machine according to claim 7, characterized in that: A guide mesh is installed on the annular groove.