An automatic roll changer for filter paper winding

Abstract

This invention relates to the field of filter paper winding machine technology, and proposes an automatic roll-changing machine for filter paper winding. The roll-changing frame is rotatably connected to the machine frame in the middle. Two core tubes are rotatably mounted at opposite ends of the roll-changing frame. The core tube closer to the paper feeding direction is in the replacement state, and the core tube further away from the paper feeding direction is in the use state. A swing frame is oscillatingly mounted on the machine frame. A glue-applying unit is located at the swing end of the swing frame. Multiple glue spray heads are all located on the glue-applying unit for applying glue. The glue-applying unit has a push-button switch for controlling the opening and closing of the glue spray heads. The push-button switch is located on the movement path of the core tube to be replaced. A torsion spring is located at the hinge end of the swing frame to provide force for the push-button switch to approach the core tube to be replaced. A cutting mechanism is located on the machine frame for cutting the filter paper between the two core tubes. This technical solution solves the problem of inconvenient roll changing in existing winding machines.

Description

Technical Field

[0001] This invention relates to the field of filter paper winding machine technology, specifically to an automatic roll changer for filter paper winding. Background Technology

[0002] Most filter papers are made of cotton fibers and are manufactured using different methods depending on their intended use. Because they are made of fibers, their surface has countless tiny pores that allow liquid particles to pass through, while larger solid particles cannot, thus achieving a solid-liquid separation filtration effect.

[0003] In the filter paper production process, filter paper needs to be stored in rolls for convenient transportation and storage. Generally, a winding machine is installed at the end of the filter paper production line for winding. When the core tube reaches the specified winding amount, a new core tube needs to be replaced. In existing technology, the winding machine lacks a roll-changing function or its function is incomplete, making core tube replacement time-consuming and labor-intensive, reducing work efficiency. Existing technology has not effectively solved these problems, causing inconvenience to the normal operation of the field. Therefore, there is an urgent need for an automatic roll-changing machine for filter paper winding to solve these problems. Summary of the Invention

[0004] This invention proposes an automatic roll-changing machine for filter paper winding, which solves the problem of inconvenient roll changing in related technologies.

[0005] The technical solution of the present invention is as follows: An automatic roll-changing machine for filter paper winding includes a frame, a roll-changing frame, core tubes, a gluing mechanism, and a cutting mechanism. The roll-changing frame is rotatably connected to the frame in the middle. There are two core tubes, which are rotatably installed at both ends of the roll-changing frame. The core tubes are detachably connected to the roll-changing frame. The core tube closer to the paper feeding direction is in a state to be replaced, and the core tube further away from the paper feeding direction is in a state of use.

[0006] The adhesive application mechanism includes a swing frame, an adhesive application unit, adhesive spray heads, and torsion springs. The swing frame is oscillatingly mounted on the machine frame. The adhesive application unit is located at the swing end of the swing frame. Multiple adhesive spray heads are mounted on the adhesive application unit for applying adhesive. The adhesive application unit has a push-button switch for controlling the opening and closing of the adhesive spray heads. The push-button switch is located on the movement path of the core cylinder to be replaced. The torsion spring is located at the hinge end of the swing frame and provides force to bring the push-button switch closer to the core cylinder to be replaced.

[0007] The cutting mechanism is mounted on the frame and is used to cut the filter paper at a position between the two core cylinders.

[0008] As a further technical solution, the cutting mechanism and the glue coating mechanism are located on both sides of the filter paper. The cutting mechanism includes a lifting frame and a cutting component. The lifting frame is slidably mounted on the frame. After the lifting frame slides, it moves closer to or away from the filter paper. The lifting frame is used to clamp the filter paper together with the core tube to be replaced. The cutting component is mounted on the lifting frame and is used to cut the filter paper at the position between the two core tubes.

[0009] As a further technical solution, the cutting component is a high-pressure water jet cutting unit, which is slidably mounted on the lifting frame in the transverse direction.

[0010] As a further technical solution, the cutting element is a serrated blade, which is slidably mounted vertically on the lifting frame to cut dotted lines on the filter paper.

[0011] As a further technical solution, an installation mechanism is also included. The installation mechanism includes a rotating seat and a locking mechanism. Two sets of rotating seats are arranged in pairs, and the two sets of rotating seats are respectively rotatably disposed at both ends of the roll changing frame. The number of locking mechanisms is the same as that of the rotating seats and they correspond one-to-one. The locking mechanisms are disposed on the rotating seats and are used to lock the core cylinder.

[0012] As a further technical solution, the locking mechanism includes a telescopic cylinder and a locking member. The telescopic cylinder is located at the center of the rotating seat, and the locking member is located on the telescopic end of the telescopic cylinder. The locking member is a truncated cone, with the large-diameter end of the truncated cone connected to the telescopic end of the telescopic cylinder, and the small-diameter end facing the core cylinder.

[0013] As a further technical solution, it also includes a lower winding inclined plate, a gravity sensor, and a flexible buffer plate. The lower winding inclined plate is disposed on the frame, and the highest end of the lower winding inclined plate is located below the core cylinder in use. The gravity sensor is disposed on the lower winding inclined plate and is located on the moving path of the core cylinder in use. The gravity sensor is electrically connected to the telescopic cylinder, and the flexible buffer plate is disposed at the lowest end of the lower winding inclined plate.

[0014] As a further technical solution, a pressure bar is also included, which is oscillatingly mounted on the frame, with the oscillating end of the pressure bar contacting the filter paper to ensure the tension of the filter paper.

[0015] As a further technical solution, the swing end of the pressure rod is rotatably equipped with a pressure roller, which contacts the filter paper.

[0016] The working principle and beneficial effects of this invention are as follows: In order to achieve automatic roll changing, a roll changing frame is set up, and a set of core tubes are installed at each end of the roll changing frame. The positions of the two core tubes are replaced by flipping the roll changing frame, thereby realizing automatic roll changing.

[0017] Specifically, the core tube and the winding frame are detachably connected, which makes it easy to disassemble the core tube after winding and to install the core tube for replacement.

[0018] To complete the roll change, the filter paper needs to be cut, and the cut ends of the filter paper are glued to the core tube to be replaced. Then, the winding process continues by controlling the rotation of the core tube to be replaced.

[0019] To ensure adhesion, a glue application mechanism is provided. During glue application, the roll changer flips over. During the flipping process, the core tube to be replaced will contact the push-button switch of the glue application unit. The glue application unit uses a conventional glue tank. After the core tube contacts the push-button switch, the push-button switch will control the glue spray head to open, thereby spraying glue onto the surface of the core tube. There are multiple glue spray heads, which spray glue at multiple points on the surface of the core tube to ensure stable adhesion.

[0020] As the roll changer continues to rotate, the core tube continues to rise to the glue application unit, overcoming the elastic force of the torsion spring, causing the swing frame to swing. As it continues to rotate, the core tube disengages from the push-button switch. At this point, under the action of the torsion spring, the swing frame resets, waiting for the next glue spraying action.

[0021] When changing rolls, the core cylinder in use has stopped rotating, but the filter paper production line is still working, and the subsequent filter paper is still being conveyed forward. As the core cylinder with the adhesive coating continues to rise, it contacts the filter paper and adheres to it, thus positioning the filter paper. The filter paper being conveyed later will temporarily lose tension and fall.

[0022] The filter paper is quickly cut by the cutting mechanism between the two core tubes. The core tube that has been wound up can then be unwound. As the changing frame continues to rotate, the newly replaced core tube will move to the position of the previous core tube and start a new round of winding. During the process of the newly replaced core tube moving to the position of the previous core tube, the filter paper that had sagged due to temporary loss of tension is straightened and regains tension. If the tension is insufficient, it can be solved by temporarily increasing the speed of the winding core tube. Thus, the changing operation is completed.

[0023] This solution achieves automatic roll changing through the combination of automatic glue spraying and automatic cutting, without requiring machine downtime, thus ensuring production efficiency. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of an automatic roll changer for filter paper winding according to the present invention from one angle.

[0026] Figure 2 Appendix to this invention Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 Appendix to this invention Figure 1 Enlarged view at point B in the middle;

[0028] Figure 4 Appendix to this invention Figure 1 Enlarged view at point C;

[0029] Figure 5 Appendix to this invention Figure 1 Enlarged view at point D;

[0030] Figure 6 This is a schematic diagram of the automatic roll changer for filter paper winding according to the present invention from another angle;

[0031] Figure 7 Appendix to this invention Figure 6 Enlarged view at point E in the middle;

[0032] Figure 8 This is a schematic diagram of the structure of the present invention when the cutting component is a serrated blade;

[0033] Figure 9 This is a schematic diagram of the roll changing frame of the present invention.

[0034] In the diagram: 1. Frame, 2. Roll changing frame, 3. Core cylinder, 4. Swing frame, 5. Glue application unit, 6. Glue spray head, 7. Torsion spring, 8. Push-button switch, 9. Lifting frame, 11. High-pressure water jet cutting unit, 12. Serrated blade, 13. Rotary seat, 14. Telescopic cylinder, 15. Locking element, 16. Lower winding slant plate, 17. Gravity sensor, 18. Flexible buffer plate, 19. Pressure bar, 20. Pressure roller. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1-9 As shown in the figure, this embodiment proposes an automatic roll-changing machine for filter paper winding, including a frame 1, a roll-changing frame 2, a core tube 3, a gluing mechanism, and a cutting mechanism. The roll-changing frame 2 is rotatably connected to the frame 1 in the middle. There are two core tubes 3, which are rotatably installed at both ends of the roll-changing frame 2. The core tubes 3 are detachably connected to the roll-changing frame 2. The core tube 3 closer to the paper feeding direction is in the replacement state, and the core tube 3 further away from the paper feeding direction is in the use state.

[0037] The glue application mechanism includes a swing frame 4, a glue application unit 5, glue spray heads 6, and a torsion spring 7. The swing frame 4 is oscillatingly mounted on the frame 1. The glue application unit 5 is located at the swing end of the swing frame 4. Multiple glue spray heads 6 are mounted on the glue application unit 5 for applying glue. The glue application unit 5 has a push-button switch 8 for controlling the opening and closing of the glue spray heads 6. The push-button switch 8 is located on the movement path of the core cylinder 3 to be replaced. The torsion spring 7 is located at the hinge end of the swing frame 4 and provides force to bring the push-button switch 8 closer to the core cylinder 3 to be replaced.

[0038] The cutting mechanism is located on the frame 1 and is used to cut the filter paper at a position between the two core cylinders 3.

[0039] In this embodiment, in order to achieve automatic roll changing, a roll changing frame 2 is set up, and a set of core cylinders 3 are installed at each end of the roll changing frame 2. The positions of the two core cylinders 3 are replaced by flipping the roll changing frame 2, thereby achieving automatic roll changing.

[0040] Specifically, the core tube 3 and the winding frame 2 are detachably connected, which makes it easy to disassemble the core tube 3 after winding and also easy to install the core tube 3 for replacement.

[0041] To complete the roll change, the filter paper needs to be cut and the cut ends of the filter paper are glued to the core cylinder 3 to be replaced. Then, the winding continues by controlling the rotation of the core cylinder 3 to be replaced.

[0042] To ensure adhesion, a glue application mechanism is provided. During glue application, the roll changer 2 flips over. During the flipping process, the core tube 3 to be replaced will contact the push-button switch 8 of the glue application unit 5. The glue application unit 5 uses a conventional glue box. After the core tube 3 contacts the push-button switch 8, the push-button switch will control the glue spray head 6 to open, thereby spraying glue onto the surface of the core tube 3. There are multiple glue spray heads 6, which spray glue at multiple points on the surface of the core tube 3 to ensure stable adhesion.

[0043] As the roll changer 2 continues to rotate, the core tube 3 continues to push up the glue application unit 5, overcoming the elastic force of the torsion spring 7, causing the swing frame 4 to swing. As it continues to rotate, the core tube 3 disengages from the push-button switch 8. At this time, under the action of the torsion spring 7, the swing frame 4 returns to its original position, waiting for the next glue spraying action.

[0044] When changing rolls, the core cylinder 3 in use has stopped rotating, but the filter paper production line is still working and the subsequent filter paper is still being conveyed forward. As the core cylinder 3 with the adhesive coating continues to rise, it contacts the filter paper and adheres to it, thus positioning the filter paper. The filter paper being conveyed later will temporarily lose tension and fall.

[0045] The filter paper is quickly cut by the cutting mechanism between the two core cylinders 3. The core cylinder 3 that has been wound up can then be unwound. As the changing frame 2 continues to rotate, the newly replaced core cylinder 3 will move to the position of the previous core cylinder 3 and start a new round of winding. During the process of the newly replaced core cylinder 3 moving to the position of the previous core cylinder 3, the filter paper that had previously sagged due to temporary loss of tension is straightened and regains tension. If the tension is insufficient, it can be solved by temporarily increasing the rotation speed of the winding core cylinder 3. Thus, the winding operation is completed.

[0046] This embodiment achieves automatic roll changing through the combination of automatic glue spraying and automatic cutting, without requiring machine downtime, thus ensuring production efficiency.

[0047] Furthermore, the cutting mechanism and the gluing mechanism are located on both sides of the filter paper, respectively. The cutting mechanism includes a lifting frame 9 and a cutting component. The lifting frame 9 is slidably mounted on the frame 1. After sliding, the lifting frame 9 moves closer to or away from the filter paper. The lifting frame 9 is used to clamp the filter paper together with the core cylinder 3 to be replaced. The cutting component is mounted on the lifting frame 9 and is used to cut the filter paper at a position between the two core cylinders 3.

[0048] In this embodiment, in order to ensure the stability of the filter paper during gluing and cutting, a lifting frame 9 is also provided. The lifting frame 9 is located above the filter paper, and the roll changing frame 2 is located below the filter paper. During gluing and cutting, the lifting frame 9 descends to contact the filter paper, and the core cylinder 3 rises to contact the filter paper after gluing. The two together clamp the filter paper and fix it. Then the cutting component performs the cutting operation to ensure its stability.

[0049] Furthermore, the cutting component is a high-pressure water jet cutting unit 11, which is slidably mounted on the lifting frame 9 in the transverse direction.

[0050] In this embodiment, the cutting component is preferably a high-pressure water jet cutting unit 11. The upper lifting frame 9 and the lower core cylinder 3 together hold the filter paper. Then, the high-pressure water jet cutting unit 11 slides laterally to cut the filter paper. The high-pressure water jet can ensure the flatness of the cut surface, and the cutting efficiency is very high. It will not generate dust or other pollutants, greatly reducing the risk of personal injury. It is very suitable for the working environment of the filter paper winding machine.

[0051] The cutting element can also be a serrated blade 12, which is slidably mounted on the lifting frame 9 along the vertical direction and is used to cut dotted lines on the filter paper.

[0052] In this embodiment, the cutting component can also be a serrated blade 12. After the upper lifting frame 9 and the lower core cylinder 3 clamp the filter paper together, the serrated blade 12 slides downward to contact and cut the filter paper, cutting a dotted line-shaped slit on the filter paper. Under the clamping of the lifting frame 9 and the core cylinder 3, when the filter paper is rolled down, a slight pulling force is applied to the core cylinder 3 to pull it off from the dotted line-shaped slit. The advantage of the dotted line-shaped slit is that the filter paper is not completely cut off and still retains a certain tension. The cut end of the filter paper will not fall down immediately until the core cylinder 3 provides pulling force when the filter paper is rolled down. After it is broken, the filter paper will be quickly retracted to prevent the filter paper end from falling down too early and interfering with other components or becoming contaminated.

[0053] Furthermore, it also includes an installation mechanism, which includes a rotating seat 13 and a locking mechanism. The rotating seats 13 are arranged in two sets, and the two sets of rotating seats 13 are respectively rotatably disposed at both ends of the roll changing frame 2. The number of locking mechanisms is the same as that of the rotating seats 13 and they correspond one-to-one. The locking mechanism is disposed on the rotating seat 13 and is used to lock the core cylinder 3.

[0054] In this embodiment, the mounting mechanism is used to position the core cylinder 3 on the rewinding frame 2. The rotating seats 13 are arranged in groups of two, and two groups are respectively set at both ends of the rewinding frame 2. The two rotating seats 13 in one group are respectively rotatably set on both sides of the rewinding frame 2 to drive the core cylinder 3 to rotate. A locking mechanism is installed on the rotating seat 13, which is used to quickly fix the core cylinder 3.

[0055] Furthermore, the locking mechanism includes a telescopic cylinder 14 and a locking member 15. The telescopic cylinder 14 is located at the center of the rotating seat 13, and the locking member 15 is located on the telescopic end of the telescopic cylinder 14. The locking member 15 is a truncated cone, with the large-diameter end of the truncated cone connected to the telescopic end of the telescopic cylinder 14, and the small-diameter end facing the core cylinder 3.

[0056] In this embodiment, the locking mechanism uses a telescopic cylinder 14 and a locking member 15. The locking member 15 is preferably a truncated cone with the small diameter end of the truncated cone facing the core cylinder 3, which facilitates insertion into the core cylinder 3. The telescopic cylinder 14 controls the locking member 15 to slide along the axial direction of the core cylinder 3, so that the locking member 15 is inserted into the core cylinder 3. Because the locking member 15 is truncated cone in shape, it can clamp the core cylinder 3, thereby achieving the positioning and locking of the core cylinder 3. Then, the rotating seat 13 drives the core cylinder 3 to rotate, ensuring normal winding.

[0057] Furthermore, it also includes a lower winding inclined plate 16, a gravity sensor 17, and a flexible buffer plate 18. The lower winding inclined plate 16 is disposed on the frame 1, and the highest end of the lower winding inclined plate 16 is located below the core cylinder 3 in use. The gravity sensor 17 is disposed on the lower winding inclined plate 16 and is located on the moving path of the core cylinder 3 in use. The gravity sensor 17 is electrically connected to the telescopic cylinder 14. The flexible buffer plate 18 is disposed at the lowest end of the lower winding inclined plate 16.

[0058] In this embodiment, in order to achieve automatic unwinding, a lower winding ramp 16 is also provided. During unwinding, as the roll changer 2 flips, the core cylinder 3 that has completed winding swings downward. The paper roll on the core cylinder 3 will contact the gravity sensor 17 on the lower winding ramp 16. After the gravity sensor 17 detects the pressure, it will send a signal to the main controller. The main controller controls the telescopic cylinder 14 in the locking mechanism to retract, so that the locking member 15 is pulled out from the core cylinder 3. The core cylinder 3 loses its support and falls naturally, rolling down along the lower winding ramp 16. During the rolling process, the weight of the paper roll itself will act on the filter paper, so that the filter paper breaks at the dotted knife edge. During the rolling process, a section of filter paper at the broken end will also be retracted. Finally, it rolls to the flexible buffer plate 18 to reduce the impact force generated by the rolling and complete the unwinding action.

[0059] Furthermore, it also includes a pressure rod 19, which is oscillatingly mounted on the frame 1. The oscillating end of the pressure rod 19 contacts the filter paper to ensure the tension of the filter paper.

[0060] The swing end of the pressure rod 19 is rotatably equipped with a pressure roller 20, which contacts the filter paper.

[0061] In this embodiment, in order to ensure that the filter paper can be received flat and tightly onto the core cylinder 3, the filter paper needs to maintain tension at all times. The pressure bar 19 is oscillatingly set on the frame 1, and a pressure roller 20 is set at the oscillating end of the pressure bar 19 so that the filter paper comes into contact with the pressure roller 20 before being returned to the core cylinder 3. The pressure roller 20 rolls on the filter paper. The pressure bar 19 and the pressure roller 20 are both located above the filter paper, and apply pressure to the filter paper with their own weight, thereby ensuring its tension.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic roll-changing machine for filter paper winding, characterized in that, The application relates to a filter paper cutting and replacing device, which comprises a rack (1), a roll replacing rack (2), core barrels (3), a glue applying mechanism and a cutting mechanism, the roll replacing rack (2) is rotationally connected to the middle of the rack (1), the core barrels (3) are two and are rotationally arranged at the two ends of the roll replacing rack (2), the core barrels (3) and the roll replacing rack (2) are detachably connected, the core barrel (3) close to the paper feeding direction is in a state to be replaced, and the core barrel (3) far from the paper feeding direction is in a state of use, the glue applying mechanism comprises a swing rack (4), a glue applying unit (5), glue spraying heads (6) and a torsional spring (7), the swing rack (4) is swingably arranged on the rack (1), the glue applying unit (5) is arranged at the swing end of the swing rack (4), the glue spraying heads (6) are arranged on the glue applying unit (5) and are used for spraying glue, the glue applying unit (5) is provided with a press switch (8), the press switch (8) is used for controlling the opening and closing of the glue spraying heads (6), the press switch (8) is located on the moving path of the core barrel (3) to be replaced, and the torsional spring (7) is arranged at the hinged end of the swing rack (4) and is used for providing the force for the press switch (8) to approach the core barrel (3) to be replaced, the cutting mechanism is arranged on the rack (1) and is used for cutting filter paper at the position between the two core barrels (3); the cutting mechanism and the glue applying mechanism are located on the two sides of the filter paper respectively, the cutting mechanism comprises a lifting frame (9) and a cutting piece, the lifting frame (9) is slidably arranged on the rack (1), the lifting frame (9) is used for approaching or moving away from the filter paper after sliding, the lifting frame (9) is used for clamping the filter paper together with the core barrel (3) to be replaced, and the cutting piece is arranged on the lifting frame (9) and is used for cutting the filter paper at the position between the two core barrels (3); the device further comprises a lower winding inclined plate (16), a gravity sensor (17) and a flexible buffer plate (18), the lower winding inclined plate (16) is arranged on the rack (1), the highest end of the lower winding inclined plate (16) is located below the core barrel (3) in use, the gravity sensor (17) is arranged on the lower winding inclined plate (16) and is located on the moving path of the core barrel (3) in use, and the flexible buffer plate (18) is arranged at the lowest end of the lower winding inclined plate (16).

2. The automatic roll changing type roll changing machine for filter paper roll winding according to claim 1, characterized in that, the cutting piece is a high-pressure water jet cutting unit (11), and the high-pressure water jet cutting unit (11) is slidably arranged on the lifting frame (9) in the transverse direction.

3. The automatic roll changing type roll changing machine for filter paper winding according to claim 1, characterized in that, the cutting piece is a sawtooth blade (12), the sawtooth blade (12) is slidably arranged on the lifting frame (9) in the vertical direction and is used for cutting a dotted line on the filter paper.

4. The automatic roll changing type roll changing machine for filter paper roll winding according to claim 3, characterized in that, the device further comprises a mounting mechanism, the mounting mechanism comprises rotating seats (13) and locking mechanisms, two groups of rotating seats (13) are arranged, the two groups of rotating seats (13) are rotationally arranged at the two ends of the roll replacing rack (2) respectively, the number of the locking mechanisms is the same as that of the rotating seats (13) and corresponds to the rotating seats (13) one by one, the locking mechanisms are arranged on the rotating seats (13) and are used for locking the core barrels (3).

5. The automatic roll changing type roll changing machine for filter paper roll winding according to claim 4, characterized in that, The locking mechanism comprises a telescopic cylinder (14) and a locking piece (15), the telescopic cylinder (14) is arranged at the center of the rotating seat (13), the locking piece (15) is arranged on the telescopic end of the telescopic cylinder (14), the locking piece (15) is a conical frustum, the large-diameter end of the conical frustum is connected with the telescopic end of the telescopic cylinder (14), and the small-diameter end faces the core barrel (3).

6. The automatic roll changing type roll changing machine for filter paper roll winding according to claim 5, wherein The gravity sensor (17) is electrically connected with the telescopic cylinder (14).

7. The automatic roll changing type roll changer for collecting filter paper according to claim 1, wherein Further comprising a pressing rod (19), the pressing rod (19) is swingly arranged on the rack (1), and the swing end of the pressing rod (19) contacts the filter paper, so that the tension of the filter paper is ensured.

8. The automatic roll changing type roll changing machine for filter paper roll winding according to claim 7, characterized in that, The swing end of the pressing rod (19) is rotationally provided with a press roller (20), and the press roller (20) contacts the filter paper.

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