A multi-point negative pressure air distribution type tissue folding roller

Abstract

This utility model relates to the technical field of household paper processing equipment, specifically a multi-point negative pressure air distribution type paper towel folding roller, including a fixed hollow central shaft and a folding roller body rotatably sleeved on the outside. The outer periphery of the folding roller body is provided with a cutter mounting groove and a cutter groove. In this utility model, negative pressure is obtained simultaneously from multiple positions at both ends and the middle through the same axial long hole, shortening the air extraction distance at different positions within the long hole, enabling the negative pressure to be transmitted to each axial area of ​​the folding roller more quickly, reducing the suction difference between the middle and both ends of the roller body, and keeping the paper in a relatively uniform adsorption state along the width direction. Furthermore, the vent holes on the central shaft, the connecting air holes on the folding roller body, and the air covers at both ends cooperate with each other, and can sequentially connect or close the corresponding air passages as the folding roller body rotates. The staggered hole relationship between the cutter groove and the cutter mounting groove is used to arrange the adsorption and release sequence, which is beneficial for the timely and stable transfer of the paper to another folding roller after cutting.

Description

Technical Field

[0001] This utility model relates to the technical field of household paper processing equipment, specifically a multi-point negative pressure gas distribution type paper towel folding roller. Background Technology

[0002] Facial tissues, including paper towels and tissue paper, are typically processed continuously using staggered folding equipment. After the paper web enters the equipment, it is adsorbed, cut, transferred, and staggered folded by folding rollers rotating in opposite directions. To ensure the paper web moves along a predetermined path with the folding rollers, a negative pressure channel extending axially is usually provided inside the roller body. Air suction holes on the roller surface are connected to the negative pressure channel. When the folding roller rotates to the corresponding working position, the negative pressure channel connects to a negative pressure source, thereby performing staged adsorption or release of the paper web.

[0003] As the length of the folding roller increases, the axial length of the negative pressure channel also increases accordingly. When the negative pressure is mainly input from the end of the negative pressure channel or from a few local positions, the distance from different axial positions within the negative pressure channel to the negative pressure input position varies. This can easily cause inconsistencies in the speed at which negative pressure is established and the resulting adsorption force at each axial position. Areas far from the negative pressure input position are particularly prone to problems such as slow negative pressure establishment or insufficient adsorption force.

[0004] During the paper towel folding process, the adsorption and retention of the paper web before and after cutting, as well as the transfer of the paper web to another folding roller after cutting, require the establishment and release of negative pressure in different rotation ranges of the folding roller. If the negative pressure response in the negative pressure channel is slow or the axial suction is unevenly distributed, the paper web may locally lift off, shift, or fail to transfer properly during the cutting and handover process, which will affect subsequent folding and continuous conveying.

[0005] Therefore, how to quickly establish negative pressure in the corresponding working range of a long axial negative pressure channel, improve the suction distribution at different positions of the folding roller in the axial direction, and meet the negative pressure switching requirements between paper web cutting and holding and paper folding processes are technical problems that need to be solved in this field. Utility Model Content

[0006] The purpose of this invention is to provide a multi-point negative pressure air distribution type paper towel folding roller to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-point negative pressure air distribution type tissue paper folding roller, comprising a fixed hollow central shaft and a folding roller body rotatably sleeved outside it, the folding roller body having a cutter mounting groove and a cutter groove, the folding roller body having multiple axial elongated holes, and surface suction holes communicating with the corresponding axial elongated holes at the cutter mounting groove and the cutter groove; the inner cavity of the central shaft is connected to a negative pressure source through a central shaft negative pressure connector, and the outer periphery of the central shaft has vent holes for the cutter groove and vent holes for the cutter mounting groove communicating with the inner cavity and located at different circumferential positions; the folding roller body has Multiple sets of radial main connecting holes are provided. One end of the radial main connecting hole is connected to the corresponding axial long hole, and the other end is selectively connected to the vent hole of the knife groove or the vent hole of the knife mounting groove as the folding roller rotates. Both ends of the folding roller are provided with paper folding air cover and paper breaking air cover fixed relative to the central axis. The paper folding air cover is selectively connected to the end hole of the axial long hole of the corresponding knife groove, and the paper breaking air cover is selectively connected to the end hole of the axial long hole of the corresponding knife mounting groove. When the same axial long hole is in the corresponding working phase, it is simultaneously connected to the negative pressure source through the end holes of both ends and the radial main connecting holes.

[0008] Furthermore, the plurality of axial elongated holes include axial elongated holes for tool grooves that correspond one-to-one with tool grooves and axial elongated holes for tool mounting grooves that correspond one-to-one with tool mounting grooves.

[0009] Furthermore, there are a total of eight axial elongated holes, four of which are axial elongated holes for knife grooves and the other four are axial elongated holes for knife mounting grooves; the knife grooves and knife mounting grooves are respectively provided in four along the circumference of the folding roller body.

[0010] Furthermore, the folding roller body is provided with four sets of radial main connecting holes at circumferential intervals. Each set of radial main connecting holes includes five knife groove connecting air holes and two tool mounting groove connecting air holes arranged axially. The five knife groove connecting air holes are connected to the same axial long hole of the knife groove, and the two tool mounting groove connecting air holes are connected to the same axial long hole of the tool mounting groove. The central shaft is provided with five knife groove venting holes and two tool mounting groove venting holes.

[0011] Furthermore, the surface suction holes are spaced apart along the axial direction of the knife groove and the knife mounting groove. One end of the surface suction hole is located on the outer peripheral surface of the folding roller body, and the other end is connected to the corresponding axial elongated hole and separated from the center hole of the folding roller body.

[0012] Furthermore, the paper-cutting air cover and the paper-folding air cover are fixed to the equipment frame. Each paper-cutting air cover is provided with a paper-cutting air cover inlet, and each paper-folding air cover is provided with a paper-folding air cover inlet. The paper-cutting air cover inlet and the paper-folding air cover inlet are respectively connected to a negative pressure source. The paper-cutting air cover and the paper-folding air cover are respectively provided with ventilation holes facing the end face of the folding roller.

[0013] Furthermore, the radial main connecting hole is arranged radially along the folding roller body and intersects with the axial elongated hole. The port of the radial main connecting hole located on the outer periphery of the folding roller body is closed by a sealing member, and the hole segment located between the central hole and the axial elongated hole of the folding roller body remains connected.

[0014] Furthermore, the center of the vent hole in the tool slot and the vent hole in the tool mounting slot form a central angle of 68.5° relative to the central axis in a projection plane perpendicular to the central axis.

[0015] Furthermore, the vent holes of the knife groove and the vent holes of the knife mounting groove are provided with removable sealing gaskets. The sealing gaskets protrude from the outer peripheral surface of the central shaft and slide against the inner wall of the folding roller body. A dust removal gap is formed between the remaining outer peripheral surface of the central shaft and the inner wall of the folding roller body.

[0016] Furthermore, a fork groove is provided on the outer periphery of the folding roller body, with the groove opening facing the radial outer side of the folding roller body. The fork of the fork mechanism has a working position that extends into the fork groove and pushes the paper away from the outer peripheral surface of the folding roller body.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model obtains negative pressure from multiple positions at both ends and the middle through the same axial long hole, shortening the air extraction distance at different positions within the long hole. This allows the negative pressure to be transmitted to each axial region of the folding roller more quickly, reducing the suction difference between the middle and both ends of the roller body. This keeps the paper in a relatively uniform adsorption state along the width direction. Furthermore, the ventilation holes on the central shaft, the connecting air holes on the folding roller body, and the air covers at both ends work together to sequentially connect or close the corresponding air passages as the folding roller body rotates. The staggered hole relationship between the knife groove and the knife mounting groove is used to arrange the adsorption and release sequence, which is beneficial for the timely and stable transfer of the paper to another folding roller after cutting. 2. In this utility model, the sealing gasket only fits against the inner wall of the folding roller in the ventilation area, which can reduce the leakage of negative pressure to other areas or the interconnection of different air passages; the sealing gasket can be replaced individually after wear, and the dust removal gap formed in other positions can also be used to introduce positive pressure gas to blow away paper scraps and dust, which makes it easy to keep the internal air passages unobstructed. 3. In this utility model, the shift fork groove is directly set on the folding roller body, so that the shift fork can extend into the shift fork groove and push the folded paper away from the roller surface, which is beneficial for the continuous downward conveying of the paper and can reduce the space occupied by setting up a separate shift fork avoidance structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the two folding rollers in an embodiment of this application; Figure 2 This is a schematic diagram of the central shaft structure in an embodiment of this application; Figure 3 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a schematic diagram of the overall structure of the origami fan cover and the paper-cutting fan cover after installation in the embodiments of this application; Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point B; Figure 6 This is a schematic diagram of the cooperation structure between the end of the folding roller and the folding air cover and the paper-cutting air cover in the embodiments of this application; Figure 7 This is a cross-sectional view of the two folding rollers in an embodiment of this application. Figure 8 This is a cross-sectional view of a single folding roller in an embodiment of this application; Figure 9 for Figure 1 A magnified schematic diagram of the structure at point C.

[0019] In the diagram: 1. Central shaft; 2. Folding roller body; 2a. Knife mounting groove; 2b. Knife groove; 2c. Knife locking groove hole; 2d. Central shaft connecting sleeve; 3. Folding roller end cap; 4. Axial elongated hole; 5. Radial main connecting hole; 6. Surface suction hole; 7. Small suction hole inside the groove; 8. Auxiliary suction hole; 9. Paper break air cover; 10. Paper break air cover air inlet; 11. Folding air cover; 12. Folding air cover air inlet; 13. Flange; 14. Vent hole; 15. Central shaft negative pressure pipe; 16. Knife groove connecting air hole; 17. Knife mounting groove connecting air hole; 18. Shift fork groove; 19. Knife groove vent hole; 20. Knife mounting groove vent hole; 21. Sealing gasket; 22. Dust removal gap. Detailed Implementation

[0020] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0021] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0023] The technical solution of this application will be further described below with reference to the accompanying drawings. It should be noted that the drawings are mainly used to show the position, fit and connection relationship between the components, and the actual size and proportion of each component can be determined according to the specifications of the tissue folding device.

[0024] The axial direction mentioned in this application refers to the direction along the axis of the central axis 1, the radial direction refers to the direction perpendicular to the axis of the central axis 1 and toward or away from the axis of the central axis 1, and the circumferential direction refers to the direction around the axis of the central axis 1. The negative pressure mentioned in this application refers to the air pressure that is lower than the external environmental pressure of the folding roller 2. The constant negative pressure refers to the negative pressure provided by the negative pressure equipment and maintained relatively stable within the corresponding working range, and does not require the negative pressure value to be absolutely constant at any time.

[0025] This embodiment provides a multi-point negative pressure air distribution type tissue folding roller for use in the staggered folding of tissues such as facial tissues and paper towels. The tissue folding device has two folding rollers arranged side by side, with the axes of the two folding rollers parallel to each other and rotating in opposite directions, so that the knife mounting groove 2a of one folding roller can sequentially cooperate with the knife groove 2b of the other folding roller to complete the adsorption, cutting, transfer, folding and separation of paper.

[0026] Please refer to the attached diagram in the instruction manual for details. Figures 1 to 9 Each folding roller includes a central shaft 1 and a folding roller body 2. The central shaft 1 is fixedly installed on the equipment frame and remains stationary during equipment operation. The folding roller body 2 is rotatably sleeved outside the central shaft 1 and is driven by the transmission mechanism of the folding equipment to rotate relative to the central shaft 1. The end of the folding roller body 2 is provided with a folding roller end cap 3. The central shaft 1 passes through the central hole of the folding roller body 2, and the central shaft connecting sleeve 2d is sleeved outside the central shaft 1 and located at the end of the folding roller body 2 to form the assembly position between the central shaft 1 and the end of the folding roller body 2.

[0027] The outer periphery of the folding roller 2 is circumferentially spaced with knife grooves 2b and knife mounting grooves 2a. In this embodiment, four knife grooves 2b and four knife mounting grooves 2a are provided. The knife mounting groove 2a is used to install a paper cutting knife. The knife can be held in the knife mounting groove 2a by cooperating with the corresponding locking member through the locking groove hole 2c. The cutting edge of the knife faces the knife groove 2b of another folding roller. The knife groove 2b is used to receive the paper released from the opposite knife mounting groove 2a at the junction of two folding rollers, and to drive the received paper to form a crease and continue to be conveyed.

[0028] The folding roller body 2 is provided with multiple axially elongated holes 4 extending along its axial direction, and each axially elongated hole 4 forms an end face opening on the axial end face of the folding roller body 2. In this embodiment, a total of eight axially elongated holes 4 are provided, of which four axially elongated holes 4 correspond one-to-one with four knife grooves 2b, and the other four axially elongated holes 4 correspond one-to-one with four tool mounting grooves 2a. Each axially elongated hole 4 serves as the axial negative pressure main channel for the corresponding knife groove 2b or tool mounting groove 2a.

[0029] Surface suction holes 6 are provided at the cutter groove 2b and the cutter mounting groove 2a. The surface suction holes 6 extend inward from the outer surface of the folding roller body 2 and communicate with the corresponding axial elongated holes 4. The surface suction holes 6 include groove-in-groove suction holes 7 provided in the corresponding groove and auxiliary suction holes 8 provided on the corresponding groove surface or adjacent roller surface. The groove-in-groove suction holes 7 and the auxiliary suction holes 8 are spaced apart along the axial direction of the folding roller body 2, and their inner ends terminate at the corresponding axial elongated holes 4, without continuing to penetrate to the center hole of the folding roller body 2.

[0030] Therefore, the surface suction holes 6 are used to disperse the negative pressure in the axial elongated holes 4 to the outer surface of the folding roller body 2 and directly adsorb the paper. By using multiple spaced surface suction holes 6, the negative pressure can be distributed along the width of the paper to multiple adsorption positions, reducing the situation where the suction force is concentrated in a single position, causing local paper depression or uneven adsorption.

[0031] The folding roller body 2 is also provided with multiple sets of radial main connecting holes 5 arranged radially along the folding roller body 2 and intersecting with the corresponding axial elongated holes 4. The openings of the holes located on one side of the center hole of the folding roller body 2 rotate together with the folding roller body 2. The radial main connecting holes 5 are divided into knife groove connecting air holes 16 and knife mounting groove connecting air holes 17 according to the axial elongated holes 4 they connect to.

[0032] Specifically, each axial elongated hole 4 corresponding to the cutter groove 2b is connected to five cutter groove connecting air holes 16 arranged axially at intervals; each axial elongated hole 4 corresponding to the cutter mounting groove 2a is connected to two cutter mounting groove connecting air holes 17 arranged axially at intervals. Corresponding to the four cutter grooves 2b and the four cutter mounting grooves 2a, the cutter groove connecting air holes 16 and the cutter mounting groove connecting air holes 17 form four sets of air distribution hole groups along the circumference of the folding roller body 2.

[0033] The aforementioned radial main connecting hole 5 can be machined by drilling from the outer periphery of the folding roller body 2 towards the central hole. The drilled hole passes through the corresponding axial elongated hole 4 and extends to the central hole of the folding roller body 2. After machining, the machined opening of the radial main connecting hole 5 on the outer periphery of the folding roller body 2 is closed by a plug, sealing member, or component installed in the groove, while the hole section between the central hole of the folding roller body 2 and the axial elongated hole 4 remains connected. Therefore, the closure is only used to close the machined opening on the outer periphery of the radial main connecting hole 5 and will not cut off the internal airflow path between the central shaft 1 and the axial elongated hole 4.

[0034] The radial main connecting hole 5 is mainly used to input negative pressure into the axial elongated hole 4, and does not directly undertake the dispersion and adsorption of the paper surface; the surface suction hole 6 is mainly used to adsorb the paper using the negative pressure in the axial elongated hole 4. The two form an interconnected but functionally different air passage structure through the axial elongated hole 4.

[0035] The central shaft 1 is a hollow tube shaft with an axially extending negative pressure cavity inside. The end of the central shaft 1 is provided with a central shaft negative pressure connector 15, which is connected to an external negative pressure device through a negative pressure pipeline.

[0036] The central shaft 1 is provided with a tool groove vent 19 and a tool mounting groove vent 20 communicating with its internal negative pressure chamber. In this embodiment, five tool groove vents 19 are arranged at intervals along the axial direction of the central shaft 1. The five tool groove vents 19 are used to communicate one-to-one with the five tool groove connecting vents 16 corresponding to the axial long hole 4 corresponding to a certain tool groove 2b when the working phase is entered.

[0037] Two vent holes 20 for the tool mounting slot are provided at axial intervals along the central axis 1. The two vent holes 20 for the tool mounting slot are used to connect one-to-one with the two vent holes 17 of the tool mounting slot corresponding to the axial long hole 4 when a certain tool mounting slot 2a enters the working phase.

[0038] The vent hole 19 in the knife slot and the vent hole 20 in the knife mounting slot are located at different circumferential positions on the central axis 1. In this embodiment, the center of the vent hole 19 in the knife slot and the vent hole 20 in the knife mounting slot form a central angle of 68.5° relative to the axis of the central axis 1 in a projection plane perpendicular to the axis of the central axis 1. This circumferential misalignment is used to form a phase difference between the negative pressure working area of ​​the knife mounting slot 2a and the negative pressure working area of ​​the knife slot 2b, so that the adsorption, cutting and release of paper by the knife mounting slot 2a and the receiving, folding and conveying of paper by the knife slot 2b are performed in a predetermined order.

[0039] A sealing gasket 21 is provided around the vent hole 19 in the cutter groove and the vent hole 20 in the cutter mounting groove. The sealing gasket 21 is installed on the outer periphery of the central shaft 1 and protrudes from the other outer periphery of the central shaft 1. The sealing gasket 21 slides against the inner wall of the central hole of the folding roller body 2 on the side facing the folding roller body 2, thereby partially sealing the air distribution area where the vent hole 19 in the cutter groove and the vent hole 20 in the cutter mounting groove are located.

[0040] When the corresponding blade groove connecting air hole 16 or the blade mounting groove connecting air hole 17 rotates to the air distribution area defined by the sealing gasket 21, the corresponding connecting air hole communicates with the vent on the central shaft 1; when the corresponding connecting air hole leaves the air distribution area with the folding roller body 2, the connecting air hole is covered by the non-ventilated area on the outer periphery of the sealing gasket 21 or the central shaft 1, thereby closing the negative pressure input in the middle of the corresponding axial elongated hole 4. The sealing gasket 21 adopts a detachable structure, and after its sliding contact surface with the inner wall of the folding roller body 2 wears, it can be removed from the central shaft 1 and replaced.

[0041] Both ends of the folding roller body 2 are provided with folding air covers 11 and paper-breaking air covers 9. That is, each folding roller is equipped with two folding air covers 11 and two paper-breaking air covers 9, and each axial end is provided with one folding air cover 11 and one paper-breaking air cover 9. The folding air covers 11 and paper-breaking air covers 9 are kept stationary by flanges 13 or fixed mounting structures on the equipment frame, and cooperate with the end face of the rotating folding roller body 2.

[0042] The paper-cutting air cover 9 is equipped with a paper-cutting air cover inlet 10, and the paper-folding air cover 11 is equipped with a paper-folding air cover inlet 12. Both the paper-cutting air cover inlet 10 and the paper-folding air cover inlet 12 are connected to an external negative pressure device via negative pressure pipelines. Both the paper-cutting air cover 9 and the paper-folding air cover 11 have ventilation holes 14 facing the end face of the folding roller body 2. The paper-cutting air cover 9 and the paper-folding air cover 11 are made of a wear-resistant material suitable for sliding relative to the end face of the folding roller body 2.

[0043] The paper-breaking air cover 9 is used to control the negative pressure on the end face of the axially elongated hole 4 corresponding to the cutter mounting groove 2a, and the paper-folding air cover 11 is used to control the negative pressure on the end face of the axially elongated hole 4 corresponding to the cutter groove 2b. When the folding roller body 2 rotates, the end face of the axially elongated hole 4 rotates with the folding roller body 2.

[0044] When a certain axially elongated hole 4 rotates to the corresponding working phase, the end holes at both ends of the axially elongated hole 4 are connected to the vent holes 14 of the corresponding air covers at both ends; the end holes of the same type of axially elongated hole 4 that are not in the corresponding working phase are covered by the non-ventilated area of ​​the air cover. Thus, the fixed air cover and the rotating end holes together constitute a mechanical periodic air distribution structure.

[0045] The air distribution positions of the folding air cover 11 and the paper breaking air cover 9 on the end face of the folding roller body 2 are set according to the corresponding working phases with the air distribution positions of the knife groove ventilation hole 19 and the knife mounting groove ventilation hole 20 on the central shaft 1, so that the end face negative pressure input and the middle negative pressure input of the same axial long hole 4 are connected synchronously.

[0046] When the axial elongated hole 4 corresponding to a certain cutter groove 2b enters the negative pressure working phase of the cutter groove, the end holes at both ends of the axial elongated hole 4 are connected to the two folding air covers 11 respectively. At the same time, the five cutter groove connecting air holes 16 corresponding to the axial elongated hole 4 are connected to the five cutter groove vent holes 19 on the central shaft 1. Therefore, the same axial elongated hole in the cutter groove simultaneously obtains negative pressure from two end face positions and five middle positions.

[0047] When the axial long hole 4 corresponding to a certain tool mounting slot 2a enters the negative pressure working phase of the tool mounting slot, the end holes at both ends of the axial long hole 4 are connected to the two paper break air covers 9 respectively. At the same time, the two tool mounting slot connecting air holes 17 corresponding to the axial long hole 4 are connected to the two tool mounting slot ventilation holes 20 on the central shaft 1. Therefore, the same tool mounting slot axial long hole can obtain negative pressure from both end face positions and both middle positions at the same time.

[0048] The aforementioned end-face negative pressure and central negative pressure act together on the same axial elongated hole 4, rather than acting separately on different axial elongated holes 4. The phase correspondence between the end-face air cover air distribution position and the central shaft air distribution position is used to synchronize the two negative pressure inputs; the circumferential misalignment between the tool groove vent 19 and the tool mounting groove vent 20 is used to form the negative pressure working sequence between the tool groove 2b and the tool mounting groove 2a, and the two belong to different air distribution relationships.

[0049] In the central negative pressure path, the gas passes sequentially through the surface of the folding roller 2 where the paper is located, the surface suction hole 6, the axial elongated hole 4, the knife groove connecting air hole 16 or the knife mounting groove connecting air hole 17, the knife groove ventilation hole 19 or the knife mounting groove ventilation hole 20, the internal negative pressure chamber of the central shaft 1, and the central shaft negative pressure pipe 15, and finally enters the external negative pressure equipment.

[0050] In the end face negative pressure path, the gas passes sequentially through the surface of the folding roller 2 where the paper is located, the surface suction hole 6, the end hole of the axial long hole 4, the ventilation hole 14 on the folding air cover 11 or the paper breaking air cover 9, the air inlet 12 of the folding air cover or the air inlet 10 of the paper breaking air cover, and finally enters the external negative pressure equipment.

[0051] Since the same axial long hole 4 has two end face negative pressure input positions and multiple middle negative pressure input positions, it can shorten the airflow transmission distance from different axial regions within the axial long hole 4 to adjacent negative pressure input positions, so that the axial long hole 4 can quickly establish negative pressure after entering the working phase, and improve the distribution of negative pressure and suction along the axial direction of the folding roller body 2.

[0052] The paper folding process in this embodiment is as follows: The paper is fed by the paper feeding mechanism of the folding equipment between two folding rollers and first adheres to the area of ​​the cutter mounting groove 2a of one of the folding rollers. When the axial elongated hole 4 corresponding to the cutter mounting groove 2a rotates to the negative pressure working phase of the cutter mounting groove, both ends of the axial elongated hole 4 are connected to negative pressure through the paper cutting air cover 9, and the middle part is connected to negative pressure through the air hole 17 connecting the cutter mounting groove and the air vent 20 of the cutter mounting groove. The surface suction hole 6 at the cutter mounting groove 2a adsorbs the paper, so that the paper adheres to the surface of the folding roller body 2 before cutting.

[0053] As the folding roller 2 continues to rotate, the cutter installed in the cutter mounting groove 2a cooperates with the cutter groove 2b of the opposite folding roller to cut the paper. During the cutting process, the cutter mounting groove 2a maintains negative pressure to reduce the paper from slipping, drifting or deviating from the predetermined conveying position before and after cutting.

[0054] After being cut, the paper continues to move toward the junction of the two folding rollers along the cutter mounting groove 2a. In this embodiment, the end hole corresponding to the cutter mounting groove 2a and the air hole 17 connecting the cutter mounting groove leave the corresponding negative pressure air distribution area about 5° before reaching the junction position, so that the negative pressure at the cutter mounting groove 2a is released before the junction.

[0055] At the same time, the axial elongated hole 4 corresponding to the knife groove 2b of the opposite folding roller enters the knife groove negative pressure working phase. The two end holes of the axial elongated hole 4 are connected to the folding air covers 11 at both ends, and its five knife groove connecting air holes 16 are connected to the five knife groove ventilation holes 19 on the central shaft 1, so that the surface suction hole 6 at the knife groove 2b generates negative pressure.

[0056] When the cutter mounting slot 2a and the opposite cutter slot 2b reach the intersection position, the negative pressure on the cutter mounting slot 2a side has been closed or is being released, while the negative pressure on the cutter slot 2b side has been established. The paper is transferred from the cutter mounting slot 2a to the opposite cutter slot 2b. Under the action of negative pressure, the cutter slot 2b receives the paper and drives the paper to continue to rotate, so that the paper forms a crease and is interlaced with another piece of paper.

[0057] The negative pressure of the cutter groove 2b mainly acts on the lower half of the folding roller and is maintained until the paper reaches the release position. A shift fork groove 18 is provided on the outer periphery of the folding roller body 2. After the paper reaches the release position, the end hole corresponding to the cutter groove 2b and the air hole 16 connecting the cutter groove leave the corresponding negative pressure distribution area, closing the negative pressure of the cutter groove 2b; the shift fork of the shift fork mechanism extends into the shift fork groove 18, releasing the paper from the outer periphery of the folding roller body 2 and conveying it downwards. The two folding rollers alternately complete the above actions, causing the cutter mounting groove 2a of one folding roller to alternately engage with the cutter groove 2b of the other folding roller, forming a continuous paper folding process.

[0058] As a dust removal implementation method, since the sealing gasket 21 protrudes beyond the rest of the outer peripheral surface of the central shaft 1, only the sealing gasket 21 partially slides against the inner wall of the central hole of the folding roller body 2, forming a dust removal gap 22 between the rest of the outer peripheral surface of the central shaft 1 and the inner wall of the central hole of the folding roller body 2. During dust removal, the dust removal gap 22 is connected to a positive pressure air source, allowing the positive pressure gas to flow along the gap 22 to blow away paper scraps and dust entering between the central shaft 1 and the folding roller body 2, thereby reducing the accumulation of paper scraps and dust at the gas distribution position and the sliding contact position. This process is positive pressure blowing or positive pressure dust removal, not adsorption of paper using positive pressure.

[0059] This embodiment employs eight axial elongated holes 4, five knife groove vent holes 19, two knife mounting groove vent holes 20, and the corresponding number of connecting vent holes. In other embodiments, the number of axial elongated holes 4, knife groove connecting vent holes 16, knife mounting groove connecting vent holes 17, knife groove vent holes 19, and knife mounting groove vent holes 20 can be adjusted according to the length of the folding roller body 2, the number of knife grooves 2b and knife mounting grooves 2a, and the negative pressure requirements, as long as the same axial elongated hole 4 entering the working phase can simultaneously obtain negative pressure from its end face and the middle position distributed along the axial direction.

[0060] 68.5° is the preferred phase angle between the vent hole 19 in the knife groove and the vent hole 20 in the knife mounting groove in this embodiment. In embodiments where the diameter of the folding roller, the number of knives, the number of grooves, or the paper feeding sequence changes, this phase angle can be adjusted according to the order required for the knife mounting groove 2a to release the negative pressure and the knife groove 2b to establish the negative pressure.

[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-point negative pressure air distribution type paper towel folding roller, comprising a fixed hollow central shaft (1) and a folding roller body (2) rotatably sleeved thereon, the folding roller body (2) having a cutter mounting groove (2a) and a cutter groove (2b), the folding roller body (2) having multiple axial elongated holes (4), and surface suction holes (6) communicating with the corresponding axial elongated holes (4) at the cutter mounting groove (2a) and the cutter groove (2b), characterized in that: The inner cavity of the central shaft (1) is connected to the negative pressure source through the central shaft negative pressure pipe (15). The outer periphery of the central shaft (1) is provided with a knife groove vent (19) and a knife mounting groove vent (20) that are connected to its inner cavity and located at different circumferential positions. The folding roller body (2) is provided with multiple sets of radial main connecting holes (5). One end of the radial main connecting hole (5) is connected to the corresponding axial long hole (4), and the other end is connected to the knife groove vent (19) or the knife mounting groove vent (20) as the folding roller body (2) rotates. The folding roller (2) is provided with a paper-folding air cover (11) and a paper-breaking air cover (9) fixed relative to the central shaft (1) at both ends of the axial direction. The paper-folding air cover (11) is selectively connected to the end hole of the axial long hole (4) of the corresponding knife groove (2b), and the paper-breaking air cover (9) is selectively connected to the end hole of the axial long hole (4) of the corresponding knife mounting groove (2a). When the same axial long hole (4) is in the corresponding working phase, it is simultaneously connected to the negative pressure source through the end holes of both ends and the radial main connecting hole (5).

2. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The multiple axial elongated holes (4) include axial elongated holes for the tool groove (2b) and axial elongated holes for the tool mounting groove (2a) that correspond one-to-one with the tool mounting groove (2b).

3. The multi-point negative pressure air distribution type tissue folding roller according to claim 2, characterized in that: There are a total of eight axial long holes (4), four of which are axial long holes for knife grooves and the other four are axial long holes for knife mounting grooves; the knife grooves (2b) and the knife mounting grooves (2a) are respectively provided in four along the circumference of the folding roller body (2).

4. The multi-point negative pressure air distribution type tissue folding roller according to claim 3, characterized in that: The folding roller body (2) is provided with four sets of radial main connecting holes (5) spaced apart along the circumference. Each set of radial main connecting holes (5) includes five knife groove connecting air holes (16) arranged along the axial direction and two knife mounting groove connecting air holes (17). The five knife groove connecting air holes (16) are connected to the same knife groove axial long hole, and the two knife mounting groove connecting air holes (17) are connected to the same knife mounting groove axial long hole. The central shaft (1) is provided with five knife groove ventilation holes (19) and two knife mounting groove ventilation holes (20).

5. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The surface suction holes (6) are spaced apart along the axial direction of the knife groove (2b) and the knife mounting groove (2a). One end of the surface suction hole (6) is located on the outer circumferential surface of the folding roller body (2), and the other end is connected to the corresponding axial elongated hole (4) and separated from the center hole of the folding roller body (2).

6. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The paper-breaking air cover (9) and the paper-folding air cover (11) are fixed to the equipment frame. Each paper-breaking air cover (9) is provided with a paper-breaking air cover inlet (10), and each paper-folding air cover (11) is provided with a paper-folding air cover inlet (12). The paper-breaking air cover inlet (10) and the paper-folding air cover inlet (12) are respectively connected to the negative pressure source. The paper-breaking air cover (9) and the paper-folding air cover (11) are respectively provided with ventilation holes (14) facing the end face of the folding roller body (2).

7. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The radial main connecting hole (5) is arranged radially along the folding roller body (2) and intersects with the axial long hole (4). The port of the radial main connecting hole (5) located on the outer periphery of the folding roller body (2) is closed by a sealing member, and the hole section between the central hole of the folding roller body (2) and the axial long hole (4) remains connected.

8. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The center of the vent hole (19) in the tool slot and the vent hole (20) in the tool mounting slot form a circle with an angle of 68.5° relative to the axis of the central axis (1) in the projection plane perpendicular to the axis of the central axis (1).

9. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The vent hole (19) of the knife groove and the vent hole (20) of the knife mounting groove are provided with a removable sealing gasket (21). The sealing gasket (21) protrudes from the outer peripheral surface of the central shaft (1) and slides against the inner wall of the folding roller (2). The remaining outer peripheral surface of the central shaft (1) and the inner wall of the folding roller (2) form a dust removal gap (22).

10. The multi-point negative pressure air distribution type tissue folding roller according to claim 1, characterized in that: The outer periphery of the folding roller (2) is provided with a fork groove (18), the groove opening of the fork groove (18) faces the radial outer side of the folding roller (2), and is used for the working position of the fork of the fork mechanism extending into the fork groove (18) and pushing the paper away from the outer periphery of the folding roller (2).

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