An adaptive intelligent paper guiding and stabilizing control system

Abstract

The application discloses a self-adaptive intelligent paper guiding and stabilizing control system, which comprises a shell, a fan is installed on the top of the shell, a drying cylinder and a vacuum cylinder are rotationally connected to the inside of the shell at equal intervals, and a motor is installed below the front face of the shell; the top of the inner wall of the shell is penetrated through and fixed with a main pipe, the inside of the main pipe is communicated with the fan, branch pipes are fixed at equal intervals at the bottom of the main pipe, the inside of the branch pipe is communicated with the inside of the main pipe, and a valve is installed in the inside of the branch pipe. The self-adaptive intelligent paper guiding and stabilizing control system can effectively reduce the paper guiding time, improve the success rate of paper guiding, adjust the tension of the paper strip, prevent the paper strip from being folded when being rolled, clean the surface of the drying cylinder, prevent dust on the drying cylinder from adhering to the paper, and improve the cleaning effect of the cleaning roller.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking machines, and in particular to an adaptive intelligent paper guiding and stabilizing control system. Background Art

[0002] Nowadays, paper is sprayed in the headbox, vacuum-dehydrated on the forming wire, and passed through the press section with pressurized felt, where the paper web is pressed and formed, and the moisture in the paper web is further removed before entering the steam-heated drying cylinder group for drying. In order to improve the physical indicators of the paper web, a sizing machine is added accordingly to improve the water resistance, tear resistance, and disassembly resistance of the paper web. For example, a paper stabilizing device for a paper machine with the publication number "CN213358139U" is provided. By providing a partition component on one side of the paper stabilizing mechanism, the negative pressure zone formed between the paper stabilizing mechanism and the thousand-wire mesh is narrowed, thereby increasing the negative pressure in the negative pressure zone above the partition component, further making the paper web more tightly adsorbed on the dryer mesh. Even at high speed and low grammage, the paper web can be well and smoothly connected between the first drying cylinder, the second drying cylinder and the vacuum cylinder, greatly reducing the sticking and folding phenomena caused by insufficient negative pressure, thereby reducing paper breaks in the paper machine and improving the operating rate. In addition, the modification cost is low and the modification time is short, thereby improving production efficiency. However, the paper stabilizing device for a paper machine still has the following disadvantages during actual use:

[0003] The above mechanism lacks a structure for cleaning the surfaces of the first and second drying cylinders during use, causing a large amount of dust to easily adhere to the surfaces of the first and second drying cylinders and stick to the surface of the paper during paper transportation, resulting in poor paper quality. It is also inconvenient to adjust the paper according to the width and tension of different papers, resulting in unevenness and indentation when the paper is rolled up.

[0004] When the existing papermaking machine's paper drawing and stabilizing mechanism is in use, the upper and lower cylinders of the drying section use independent dryer fabric structures. Therefore, when the paper moves from the lower cylinder to the upper cylinder, there is no dryer fabric to guide it. The success rate of wet paper drawing is extremely low and the paper is time-consuming. After the paper is successfully drawn and expanded, the paper width swings greatly after entering the drying cylinder early, which is extremely easy to break and tear. There are many paper fibers and stickies, which affects production and may even reduce the speed of operation or make it impossible to produce low-weight paper grades.

[0005] Therefore, we propose an adaptive intelligent paper threading and stabilizing control system to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide an adaptive intelligent paper-leading and stabilizing control system to solve the problems raised in the above-mentioned background technology that the existing intelligent paper-leading and stabilizing control systems on the market lack a structure for cleaning the surfaces of the first drying cylinder and the second drying cylinder during use, are inconvenient to adjust according to the width and tension of different papers, have a long paper-leading time, and have a low success rate for paper-leading.

[0007] To achieve the above object, the present application provides the following technical scheme: an adaptive intelligent paper guiding and stabilizing control system, comprising a shell, a fan is installed on the top of the shell, a drying cylinder and a vacuum cylinder are rotationally connected at equal intervals inside the shell, and a motor is installed below the front of the shell;

[0008] Further comprising: a main pipe is fixed through the top of the inner wall of the shell, the inside of the main pipe is communicated with the fan, branch pipes are fixed at equal intervals at the bottom of the main pipe, the inside of the branch pipe is communicated with the inside of the main pipe, a valve is installed in the inside of the branch pipe, and a paper stabilizer is fixedly connected to the outside of the vacuum cylinder;

[0009] The paper stabilizer is communicated with the inside of the branch pipe, an axle rod is rotationally connected through one end inside the shell, the front end of the axle rod is fixedly connected with the output end of the motor, a fixed rod is fixedly connected to the front end inside the shell, and a first threaded rod is rotationally connected to the rear end inside the shell;

[0010] The outside of the first threaded rod and the fixed rod is sleeved with a first sleeve block, a support seat is fixedly connected to the top of the side surface of the first sleeve block, the two ends of the drying cylinder are connected with the side surface of the first sleeve block, a limiting ring is sleeved to the outside of the two ends of the drying cylinder, and a wind speed sensor is installed on one side inside the paper stabilizer.

[0011] Preferably, the axle rod and the outside of the front end of the cleaning roller are drivingly connected through a belt pulley assembly, a transmission rod is sleeved to the outside of the tail end of the axle rod, a ratchet assembly is installed at the connecting position of the transmission rod and the axle rod, and the tail end of the ratchet assembly and the bottom of the first threaded rod are drivingly connected through a second bevel gear set.

[0012] Through the above technical scheme, when the axle rod reversely rotates, the ratchet assembly drives the transmission rod to rotate.

[0013] Preferably, the first sleeve block and the first threaded rod are threadedly connected on the left side, and the first sleeve block and the fixed rod are slidingly connected on the right side.

[0014] Through the above technical scheme, the first sleeve block is raised and lowered on the first threaded rod and the fixed rod.

[0015] Preferably, second threaded rods are rotationally connected to the left and right sides inside the support seat, second sleeve blocks are threadedly sleeved to the outside of the two second threaded rods, and the top of the second sleeve block and the inner wall of the support seat are slidingly and claspingly connected.

[0016] Through the above technical scheme, the two limiting rings are moved closer to each other and farther away from each other, so as to limit the paper strips of different widths.

[0017] Preferably, the bottom of the second block is fixedly connected to the top of the limiting ring, a rotating rod is rotatably connected through the top of the inner wall of the support seat, and the bottom of the rotating rod is connected to the opposite ends of the two second threaded rods through a first bevel gear set.

[0018] By adopting the above technical solution, the rotating rod drives the two second threaded rods to rotate using the first bevel gear set.

[0019] Preferably, a cleaning roller is rotatably connected to the interior of the limiting ring, and the outer side of the cleaning roller is in contact with the outer side of the drying cylinder. A rotating block is fixed on the outer side of one end of the cleaning roller, and a vibration block is provided on the outer side of the other end of the cleaning roller.

[0020] By adopting the above technical solution, the rotation of the cleaning roller can drive the rotating block to rotate.

[0021] Preferably, movable rods are hinged on both the left and right sides of the interior of the shell, and a striking block is fixedly connected to the side of one end of the movable rod, and magnets are installed on the side of the other end of the movable rod and the side of the rotating block.

[0022] By adopting the above technical solution, the dust on the surface of the cleaning roller can be shaken off by using the striking block to strike the vibration block back and forth.

[0023] Preferably, the movable rod is arranged in a "V" shape, and a vortex spring is installed at the connection position between the axial end in the middle of the movable rod and the outer shell, the positions of the two magnets correspond to each other, and the magnetic properties of the opposing surfaces of the two magnets are the same, and the positions of the striking block and the vibration block correspond to each other.

[0024] By adopting the above technical solution, the stored force of the vortex spring can be used to drive the movable rod to reset.

[0025] Preferably, a dryer net is provided on the outside of the vacuum cylinder, and holes are opened on the outsides of the vacuum cylinder and the dryer net, and the holes correspond to the bottom of the paper stabilizer.

[0026] By adopting the above technical solution, the paper strips can be easily removed by using a dryer net.

[0027] Compared with the prior art, the present invention has the following beneficial effects: the adaptive intelligent paper threading and stabilization control system can effectively reduce paper threading time and improve the success rate of paper threading. It can also adjust the tension of the paper strip so that the paper strip will not be creased when it is rewound. It can also clean the surface of the drying cylinder to prevent dust on the drying cylinder from sticking to the paper, and at the same time improve the cleaning effect of the cleaning roller. The specific details are as follows;

[0028] 1. A paper stabilizer is provided. When the paper strip is threaded, the valve opens and the air blown out by the fan is dispersed into each branch pipe through the main pipe. The paper is threaded in the threading area through high vacuum adsorption, which greatly shortens the threading time and improves the threading success rate. When the paper strip is threaded successfully, the dryer mesh is provided during the expansion process, so that the stickies are on the outside of the mesh and then fall off the mesh surface due to the centrifugal force.

[0029] 2. A cleaning roller is provided. When the motor drives the shaft to rotate forward, the transmission rod does not rotate. The pulley assembly drives the cleaning roller to rotate, cleaning the surface of the drying cylinder to prevent dust on the drying cylinder from sticking to the paper. When the motor drives the shaft to rotate backward, the ratchet assembly drives the transmission rod to rotate, and the second bevel gear set drives the first threaded rod to rotate, which then causes the first set of blocks to drive the drying cylinder to move upward, thereby adjusting the tension of the paper.

[0030] 3. A striking block is provided. When the cleaning roller rotates, it can drive the rotating block to rotate. At this time, the positions of the two magnets correspond to each other, and due to the principle that like-charged magnets repel each other, the movable rod can be rotated, and then the stored force of the vortex spring can drive the movable rod to reset, so that the striking block at the other end can reciprocately knock on the vibration block, so that the vibration generated by the knocking can shake off the dust or impurities on the surface of the cleaning roller, thereby improving the subsequent cleaning effect of the cleaning roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0032] Figure 2 It is a schematic diagram of a partial side sectional structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the side cross-section structure of the vacuum cylinder of the present invention;

[0035] Figure 5 This is a schematic diagram of the top view of the movable rod of the present invention;

[0036] Figure 6 This is a schematic side cross-sectional view of the paper stabilizer of the present invention;

[0037] Figure 7 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0038] Figure 8 It is a schematic side view of the limiting ring structure of the present invention.

[0039] In the figure: 1. Outer casing; 2. Drying cylinder; 3. Vacuum cylinder; 4. Fan; 5. Branch pipe; 6. Main pipe; 7. Paper stabilizer; 8. Valve; 9. Drying net; 10. Cleaning roller; 11. Shaft; 12. Pulley assembly; 13. Fixed rod; 14. Support seat; 15. First set of blocks; 16. First threaded rod; 17. Second threaded rod; 18. Rotating rod; 19. Second set of blocks; 20. First bevel gear set; 21. Limiting ring; 22. Transmission rod; 23. Second bevel gear set; 24. Vibrating block; 25. Rotating block; 26. Magnet; 27. Movable rod; 28. Vortex spring; 29. ​​Striking block; 30. Hole; 31. Wind speed sensor; 32. Ratchet assembly. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1-8 The present invention provides a technical solution: an adaptive intelligent paper threading and stabilizing control system, comprising a housing 1, a fan 4 is installed on the top of the housing 1, and a drying cylinder 2 and a vacuum cylinder 3 are rotatably connected at equal intervals inside the housing 1, and a motor is installed below the front of the housing 1;

[0042] The invention also includes: a main pipe 6 is fixed through the top of the inner wall of the shell 1, and the interior of the main pipe 6 is connected to the fan 4, and branch pipes 5 are fixed at equal intervals at the bottom of the main pipe 6, the branch pipes 5 are connected to the interior of the main pipe 6, and valves 8 are installed inside the branch pipes 5, and a paper stabilizer 7 is fixedly connected to the outside of the vacuum cylinder 3; the paper stabilizer 7 is connected to the interior of the branch pipe 5, one end of the interior of the shell 1 is rotatably connected to a shaft rod 11, and the front end of the shaft rod 11 is fixedly connected to the output end of the motor, the front end of the interior of the shell 1 is fixedly connected to a fixing rod 13, and the shell 1 The rear end of the interior is rotatably connected to a first threaded rod 16; the outsides of the first threaded rod 16 and the fixed rod 13 are both sleeved with a first sleeve block 15, and the upper side of the first sleeve block 15 is fixedly connected to a support base 14. The two ends of the drying cylinder 2 are respectively connected to the side surfaces of the first sleeve block 15. The outer sides of the two ends of the drying cylinder 2 are sleeved with a limit ring 21. A wind speed sensor 31 is installed on one side of the interior of the paper stabilizer 7. The outside of the vacuum cylinder 3 is provided with a dryer fabric 9. The outsides of the vacuum cylinder 3 and the dryer fabric 9 are provided with a hole 30, which corresponds to the bottom of the paper stabilizer 7.

[0043] like Figure 1 、 Figure 2 and Figure 6As shown, when the paper strip is threaded, the system automatically adjusts to the threading state, activates valve 8, and starts fan 4, causing fan 4 to generate suction. At this time, the suction passes through the main pipe 6 and each branch pipe 5 and enters the paper stabilizer 7. At this time, the vacuum cylinder 3 rotates and makes its holes 30 correspond to the paper stabilizer 7, providing vacuum for the vacuum cylinder 3. The surface of the vacuum cylinder 3 wrapped by the dryer fabric 9 is connected to the dryer fabric 9 through another part of the holes 30. Then, the outer surface of the dryer fabric 9 can absorb the paper web, greatly reducing the threading time and greatly improving the threading success rate. Improvement, when the paper strip is successfully guided, during the expansion process, the valve 8 of the bellows automatically switches to the full-width paper stabilization state. After the full width is rolled up, the system will calculate and adjust according to the quantitative and vehicle speed, and detect the air volume of the fan 4 through the wind speed sensor 31, so that it can adaptively adjust the frequency to ensure that the paper web reaches the best stability and stretchability on the cylinder surface and the mesh surface, and further pass through the dryer mesh 9 so that the adhesive of the paper strip is outside the dryer mesh 9, and then separated from the mesh surface and falls off by the centrifugal force, thereby reducing the generation of paper hair and the accumulation and falling of a large amount of paper hair causing paper breaks.

[0044] The shaft 11 is connected to the outer side of the front end of the cleaning roller 10 through a pulley assembly 12, and a transmission rod 22 is sleeved on the outer side of the tail end of the shaft 11, and a ratchet assembly 32 is installed at the connection position of the transmission rod 22 and the shaft 11, and the tail end of the ratchet assembly 32 and the bottom of the first threaded rod 16 are connected through a second bevel gear set 23, the left first set block 15 and the first threaded rod 16 are threadedly connected, and the right first set block 15 and the fixed rod 13 are slidably connected, the left and right sides of the support seat 14 are rotatably connected to the second threaded rod 17, and the outer sides of the two second threaded rods 17 are sleeved with second sets of blocks 19, the top of the second set of blocks 19 and the inner wall of the support seat 14 are slidably engaged, the bottom of the second set of blocks 19 is fixedly connected to the top of the limit ring 21, the top of the inner wall of the support seat 14 is rotatably connected with a rotating rod 18, and the bottom of the rotating rod 18 and the opposite ends of the two second threaded rods 17 are connected through the first bevel gear set 20;

[0045] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 and Figure 8As shown, the rotating rod 18 is then rotated so that the rotating rod 18 drives the two second threaded rods 17 to rotate using the first bevel gear set 20. At this time, the two second sets of blocks 19 drive the two limit rings 21 to move closer to or away from each other, thereby limiting the paper strips of different widths. Then the motor is started, and the motor drives the shaft 11 to rotate forward. At this time, the transmission rod 22 will not rotate, so that the shaft 11 drives the cleaning roller 10 to rotate using the pulley assembly 12, and cleans the dust on the surface of the drying cylinder 2 to prevent dust from sticking to the paper strip on the drying cylinder 2. When the motor drives the shaft 11 to reverse, the ratchet assembly 32 can drive the transmission rod 22 to rotate, and at the same time, the second bevel gear set 23 is used to drive the first threaded rod 16 to rotate, and then the first set of blocks 15 drives the drying cylinder 2 to move upward, thereby adjusting the tension of the paper strip, so that the paper strip will not be creased when it is rolled up.

[0046] The interior of the limiting ring 21 is rotatably connected to the cleaning roller 10, and the outer side of the cleaning roller 10 is in contact with the outer side of the drying cylinder 2. A rotating block 25 is fixed on the outer side of one end of the cleaning roller 10, and a vibrating block 24 is provided on the outer side of the other end of the cleaning roller 10. The left and right sides of the interior of the shell 1 are hinged with movable rods 27, and a striking block 29 is fixedly connected to the side of one end of the movable rod 27, and magnets 26 are installed on the side of the other end of the movable rod 27 and the side of the rotating block 25. The movable rod 27 is arranged in a "V" shape, and a vortex spring 28 is installed at the connection position between the axial end in the middle of the movable rod 27 and the shell 1. The positions of the two magnets 26 correspond to each other, and the magnetic properties of the opposing surfaces of the two magnets 26 are the same. The striking block 29 corresponds to the position of the vibrating block 24.

[0047] like Figure 2 and Figure 5 As shown, when the cleaning roller 10 rotates, it can drive the rotating block 25 at one end to rotate. At this time, the rotating block 25 corresponds to the position of the two magnets 26 on the movable rod 27, and due to the principle of like-sex repulsion of magnets 26, the movable rod 27 can be rotated (at this time, the vortex spring 28 is storing force), so that the striking block 29 at the other end of the movable rod 27 moves and knocks the vibration block 24. When the rotating block 25 is away from the movable rod 27, the stored force of the vortex spring 28 can drive the movable rod 27 to reset, so that the striking block 29 knocks the vibration block 24 back and forth, so that the vibration generated during the knocking can shake off the dust or impurities on the surface of the cleaning roller 10, thereby improving the subsequent cleaning effect of the cleaning roller 10.

[0048] Working principle of this embodiment: When using the adaptive intelligent paper threading and stabilizing control system, combined with Figures 1-8As shown, first, the fan 4 is started to generate suction, and the paper web can be adsorbed by the vacuum cylinder 3, thereby greatly reducing the paper threading time and greatly improving the paper threading success rate. When the paper strip is successfully threaded, the wind speed sensor 31 detects the air volume of the fan 4, so that it can adaptively adjust the frequency to ensure that the paper web reaches the best stability and stretchability on the cylinder surface and the wire surface. Further, the adhesive on the paper strip is outside the dryer wire 9 and then separated from the wire surface and falls due to the centrifugal force, thereby reducing the generation of paper hair and the accumulation and falling of a large amount of paper hair causing paper breakage. Then, by rotating the rotating rod 18, the two second sets of blocks 19 drive the two limit rings 21 to move closer to or away from each other, so that paper strips of different widths can be threaded. Limit, then the motor drives the shaft 11 to rotate forward, at this time the cleaning roller 10 rotates and cleans the dust on the surface of the drying cylinder 2, and when the motor drives the shaft 11 to reverse, at this time the first set of blocks 15 drives the drying cylinder 2 to move upward, and then the tension of the paper strip can be adjusted so that the paper strip will not have creases when it is rolled up. At the same time, when the cleaning roller 10 rotates, the principle of like-sex repulsion of the magnet 26 can be used to make the movable rod 27 rotate, and under the action of the vortex spring 28, the striking block 29 reciprocates to knock the vibration block 24, so that the vibration generated by the knocking can shake off the dust or impurities on the surface of the cleaning roller 10, thereby improving the subsequent cleaning effect of the cleaning roller 10, thereby completing a series of tasks.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adaptive intelligent paper guiding and stabilizing control system, comprising a housing (1), a fan (4) being installed on the top of the housing (1), a drying cylinder (2) and a vacuum cylinder (3) being rotatably connected at equal intervals inside the housing (1), and a motor being installed below the front surface of the housing (1); It is characterized in that Also includes: A main pipe (6) is fixed through the top of the inner wall of the shell (1), and the interior of the main pipe (6) is connected to the fan (4), and branch pipes (5) are fixed at equal intervals on the bottom of the main pipe (6), and the branch pipes (5) are connected to the interior of the main pipe (6), and valves (8) are installed inside the branch pipes (5). A paper stabilizer (7) is fixedly connected to the outside of the vacuum cylinder (3); The paper stabilizer (7) is connected to the inside of the branch pipe (5), one end of the inside of the housing (1) is rotatably connected to a shaft (11), and the front end of the shaft (11) is fixedly connected to the output end of the motor, the front end of the inside of the housing (1) is fixedly connected to a fixing rod (13), and the rear end of the inside of the housing (1) is rotatably connected to a first threaded rod (16); The first threaded rod (16) and the fixed rod (13) are both sleeved with a first sleeve block (15) on their outer sides, and a support seat (14) is fixedly connected to the upper side of the first sleeve block (15); the two ends of the drying cylinder (2) are respectively connected to the side of the first sleeve block (15); the two ends of the drying cylinder (2) are both sleeved with a limit ring (21) on their outer sides; and a wind speed sensor (31) is installed on one side of the interior of the paper stabilizer (7); A cleaning roller (10) is rotatably connected to the interior of the limiting ring (21), and the outer side of the cleaning roller (10) is in contact with the outer side of the drying cylinder (2). A rotating block (25) is fixedly sleeved on the outer side of one end of the cleaning roller (10), and a vibrating block (24) is provided on the outer side of the other end of the cleaning roller (10). The left and right sides of the housing (1) are hingedly connected to movable rods (27), and a striking block (29) is fixedly connected to the side surface of one end of the movable rod (27), and magnets (26) are installed on the side surface of the other end of the movable rod (27) and the side surface of the rotating block (25); The movable rod (27) is arranged in a "V" shape, and a vortex spring (28) is installed at the connection position between the shaft end in the middle of the movable rod (27) and the housing (1). The positions of the two magnets (26) correspond to each other, and the magnetic properties of the opposing surfaces of the two magnets (26) are the same. The positions of the striking block (29) and the vibration block (24) correspond to each other.

2. The adaptive intelligent web threading and stabilization control system according to claim 1, characterized in that: The shaft (11) is connected to the outer side of the front end of the cleaning roller (10) through a pulley assembly (12); a transmission rod (22) is sleeved on the outer side of the rear end of the shaft (11); a ratchet assembly (32) is installed at the connection position between the transmission rod (22) and the shaft (11); and the rear end of the ratchet assembly (32) and the bottom of the first threaded rod (16) are connected through a second bevel gear assembly (23).

3. The adaptive intelligent web threading and stabilization control system according to claim 1, characterized in that: The first set block (15) on the left side is connected to the first threaded rod (16) by a threaded connection, and the first set block (15) on the right side is connected to the fixed rod (13) by a sliding connection.

4. The adaptive intelligent web threading and stabilization control system according to claim 1, characterized in that: The left and right sides of the support seat (14) are both rotatably connected to second threaded rods (17), and the outer sides of the two second threaded rods (17) are both threadedly connected to second sleeve blocks (19), and the top of the second sleeve blocks (19) is connected to the inner wall of the support seat (14) in a sliding engagement.

5. The adaptive intelligent web threading and stabilization control system according to claim 4, characterized in that: The bottom of the second set block (19) is fixedly connected to the top of the limiting ring (21), the top of the inner wall of the support seat (14) is rotatably connected to a rotating rod (18), and the bottom of the rotating rod (18) and the opposite ends of the two second threaded rods (17) are transmission-connected via a first bevel gear set (20).

6. The adaptive intelligent web threading and stabilization control system according to claim 1, characterized in that: A dryer net (9) is provided on the outside of the vacuum cylinder (3), and holes (30) are provided on the outsides of the vacuum cylinder (3) and the dryer net (9), and the holes (30) correspond to the bottom of the paper stabilizer (7).

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