M-fold folding device

Abstract

This invention discloses an M-folding device, belonging to the field of medical dressing technology. It includes a folding structure, a roller conveying structure, and a 90° flipping structure. The folding structure comprises a frame, a conveyor plate, an input roller, a roller traction mechanism, and N folding plates. The input roller is located below and in front of the conveyor plate, and the roller traction mechanism is located adjacent to the rear of the conveyor plate. The folding plates are vertically arranged. The conveyor plate is arranged obliquely upwards from front to back and is composed of N+1 angular plates. Multiple angular plates are arranged in a fan shape with their apexes aligned. Folding plates are placed between adjacent angular plates, and the N folding plates and N+1 angular plates are arranged alternately. The folding plates extend from the front to the rear of the conveyor plate, with the lower side of the front end above the conveyor plate and the lower side of the rear end below the conveyor plate. Some or all of the angular plates fold the fabric, with a maximum number of folds of 2N-1. The height of the rear end of the angular plates is adjustable, and the distance between the lower rear end of the folding plate and the rear end of the angular plate is adjustable.

Description

Technical Field

[0001] This invention belongs to the field of medical dressing technology, and specifically relates to an M-fold folding device that is highly adaptable. Background Technology

[0002] Medical dressings can be made from non-woven fabric through processes such as cutting, folding, and packaging. In terms of folding methods, folding includes longitudinal folding and transverse folding; in terms of folding forms, folding includes bifolding, inward quad folding, and M-folding.

[0003] For example, patent application number CN202110156959.4 discloses a bed cover production and processing machine for bedspreads and pillowcases, including a machine body, a feeding rack, a traction device, a first flanging device, a second flanging device, an ultrasonic continuous edge pressing device, a V-shaped ultrasonic edge sealing device, a V-shaped roller cutter, an M-folding device, and a product cutting and forming device; the feeding rack is equipped with a support frame and a correction device, and a first support rod is provided on one side of the support frame. The support frame is located at the end of the correction device away from the traction device. The traction device is composed of a traction mechanism, and an elastic band is provided inside the traction mechanism. The first flanging device is located at the end of the traction device away from the feeding rack. The first flanging device is composed of a first ball screw and a first flanging mechanism, and a first flanging block is provided at one end of the first flanging mechanism. The second flanging device is composed of a second ball screw, a second flanging mechanism, and a first support assembly. The second flanging mechanism is located on the second ball screw. The second flanging mechanism has a second flanging block at one end. The ultrasonic continuous pressing device is located between the first flanging device and the second flanging device. The V-shaped ultrasonic sealing device is located at the end of the second flanging device away from the ultrasonic continuous pressing device. The V-shaped ultrasonic sealing device consists of a third ball screw and a first sealing mechanism, with the first sealing mechanism located on the third ball screw. The V-shaped roller cutter is located at the end of the V-shaped ultrasonic sealing device away from the second flanging device. The M-folding device is located at the end of the V-shaped roller cutter away from the V-shaped ultrasonic sealing device. The M-folding device consists of a first guide roller, a second guide roller, a first support column, and a second support column. Multiple first guide rollers and second guide rollers are staggered. The product cutting and forming device is located at the end of the M-folding device away from the V-shaped roller cutter. The product cutting and forming device consists of a conveying device and a cutting device, with the cutting device located at the end of the conveying device away from the M-folding device.

[0004] For example, patent application number 202210274676.4 discloses a device for preparing disposable bed sheets, which includes, from front to back, a feeding structure, an elastic band traction structure, an upper folding structure, an ultrasonic continuous sealing structure, a lower folding structure, a V-shaped ultrasonic sealing structure, a V-shaped roller cutting structure, an M-folding structure, and a slitting structure. The elastic band traction structure feeds two elastic bands to the upper side of the left and right sides of the fabric, the upper folding structure is used to fold the left and right sides of the fabric upward to form upper folds to cover the corresponding elastic bands, and the lower folding structure is used to fold the left and right sides of the fabric downward. The fabric is formed with a lower flange. The V-shaped ultrasonic sealing structure is used to form an outward-facing V-shaped seal on the left and right sides of the fabric and the corresponding lower flange. The V-shaped roller cutting structure is used to roll cut the fabric on the left and right sides and inside the V-shaped seal to form a V-shaped opening that matches the V-shaped seal. The ultrasonic continuous sealing structure is used to press the inner end of the upper flange onto the fabric. The inner end of the V-shaped seal is located inside the elastic band, and the weld point on the elastic band is denser than the weld points at other locations. The V-shaped opening is located outside the elastic band. The slitting structure is used to slit the fabric and elastic band at the V-shaped opening.

[0005] Existing technologies typically employ multiple folding rods (arranged in a fan shape and staggered vertically) to fold fabrics, which usually only allows for the production of products of a single specification and has poor applicability. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides an M-folding device that can produce products of various specifications (such as different numbers of folds, different folding widths, etc.) by adjusting the rotating frame, folding plate, and angled plate. The technical solution is as follows:

[0007] This invention provides an M-folding device, which includes a folding structure, a roller conveying structure 2, and a 90° flipping structure 3 arranged sequentially from front to back. The 90° flipping structure 3 allows a vertical fabric 1 to be flipped to a horizontal position. The folding structure includes a frame 4, a conveyor plate 5, an input roller 6, a roller traction mechanism 8, and N folding plates 7. The input roller 6 and the roller conveying structure 2 are driven by corresponding structures with coordinated speeds. The input roller 6 is located below and in front of the conveyor plate 5 and is arranged horizontally. The roller traction mechanism 8 is located adjacent to and behind the conveyor plate 5 and is arranged vertically. The roller conveying structure 2 is arranged vertically and is located directly behind the roller traction mechanism 8. The folding plates 7 are arranged vertically and their lower sides are horizontal or diagonally upward from front to back. The conveyor plate 5 is diagonally upward from front to back and is composed of N+1 angular plates 10. The angle of inclination is greater than the angle of inclination of the lower side of the folding plate 7; the angle plate 10 is an isosceles triangle with its rear end as the apex angle, multiple angle plates 10 are distributed in a fan shape with their apex angles aligned, the corresponding sides of adjacent angle plates 10 are parallel to form a strip channel, a folding plate 7 is provided in the strip channel along its direction, N folding plates 7 and N+1 angle plates 10 are arranged alternately, the folding plate 7 has a gap with the angle plates 10 on both sides; the folding plate 7 extends from the front part of the conveying plate 5 to the rear part of the conveying plate 5, its front lower side is above the conveying plate 5, and its rear lower side is below the conveying plate 5; some or all of the angle plates 10 fold the fabric 1, the maximum number of folds is 2N-1 folds; the height of the front ends of multiple angle plates 10 is aligned, the height of the rear end of the angle plate 10 can be adjusted up and down, and the distance between the lower rear end of the folding plate 7 and the rear end of the angle plate 10 can be adjusted.

[0008] In this case, only the K adjacent corner plates 10 fold the fabric 1, where K is less than or equal to N+1; for the K corner plates 10, if the end of the folded fabric 1 is located outside the corresponding folding plate 7, then the rear end of the corner plate 10 corresponding to the end of the fabric 1 is lower than the rear end of the other corner plates 10 to form a low-position corner plate, and the rear end of the middle corner plate 10 is flush.

[0009] In this embodiment of the invention, the frame 4 includes a base 41, a rotating frame 42, a rotating shaft 43, a front door bracket 44, and a rear door bracket 45. The input roller 6 is located on the front side of the base 41. The rotating frame 42 is located above the base 41 and is angularly adjustable on the base 41. The two corner plates 10 at the left and right ends are low-position corner plates. If folding requires low-position corner plates, the rotating frame 42 is adjusted so that the corner plate 10 at the left or right end corresponds to the corresponding end of the fabric 1, and the corner plate 10 at the other end of the fabric 1 is adjusted downwards or not. If folding does not require low-position corner plates, the rotating frame 42 is adjusted so that the fabric 1 is located between the two corner plates 10 at both ends. The rotating frame 42 is horizontally set, and its rear end is rotatably mounted on the base 4 via a vertically set rotating shaft 43. The front end of the device is slidably mounted on the base 41 via multiple rollers, and the front and rear ends are respectively provided with a front door bracket 44 and a rear door bracket 45. The front part of the base 41 is provided with an arc-shaped track for the rollers to slide on, and a handwheel adjustment mechanism is provided between the arc-shaped track and the rotating frame 42. The arc-shaped track is coaxially arranged with the rotating shaft 43, which is located directly below the center of the fan shape. The front door bracket 44 is an arc-shaped frame that protrudes forward and is located above the conveyor plate 5. The rear door bracket 45 is located adjacent to the rear of the conveyor plate 5. The angle plate 10 is provided on the rotating frame 42, the roller traction mechanism 8 is provided on the rear door bracket 45, and the folding plate 7 is arranged radially along the fan shape, with its front and rear ends respectively provided on the front door bracket 44 and the rear door bracket 45.

[0010] Furthermore, the frame 4 in this embodiment of the invention also includes 2N+2 lifting adjustment structures 46. The front and rear of each angle plate 10 are mounted on the rotating frame 42 via the lifting adjustment structure 46. The lifting adjustment structure 46 includes a sleeve vertically mounted on the rotating frame 42 and a single-rod joint bearing between the sleeve and the lower side of the angle plate 10. The straight rod at the lower part of the single-rod joint bearing is inserted into the sleeve and locked with bolts, and the ring seat at the upper part is adjustablely mounted on the lower side of the angle plate 10.

[0011] Specifically, in this embodiment of the invention, the upper front end of the folding plate 7 is mounted on the top beam of the front door bracket 44 via a hinge seat 47, and its rear end is mounted on the top beam of the rear door bracket 45 via a universal connector 48. The hinge seat 47 can be adjusted along the direction of the folding plate 7, and its axis of rotation is perpendicular to the folding plate 7. The universal connector 48 includes a vertically arranged vertical connecting rod, a longitudinal connecting rod arranged in the front-back direction, a longitudinal motion joint between the upper end of the vertical connecting rod and the front end of the longitudinal connecting rod, and a transverse motion joint in the middle of the longitudinal connecting rod. The vertical connecting rod is located on the upper rear side of the folding plate 7. The axis of rotation of the longitudinal motion joint is horizontally arranged and perpendicular to the folding plate 7, allowing the vertical connecting rod to be adjusted in the front-back direction. The axis of rotation of the transverse motion joint is perpendicular to the axis of rotation of the longitudinal motion joint, allowing the front part of the longitudinal connecting rod to be adjusted in the left-right direction. The longitudinal connecting rod is arranged obliquely upward from front to back, and its rear part is adjustable on the rear door bracket 45. The longitudinal motion joint is provided with a limiting bolt to restrict the forward rotation of the vertical connecting rod.

[0012] In this embodiment of the invention, the roller traction mechanism 8 is located adjacent to the center of the fan-shaped circle and includes two adjustment frames and traction rollers on its inner side. The two adjustment frames are respectively adjustable to the left and right on the two vertical beams of the rear door type bracket 45. The two traction rollers are arranged side by side and are respectively located on the left and right sides of the fabric 1. The traction rollers are arranged vertically.

[0013] Preferably, in this embodiment of the invention, the upper rear end of the folding plate 7 is provided with a notch 11, the rear end of the angled plate 10 is located at the notch 11, and the vertical connecting rod is located in front of the notch 11.

[0014] In this embodiment of the invention, the angled plate 10 is arranged obliquely upward from front to back, with its front end being a right-angled side or a forward-protruding arc-shaped side, its front end being bent downward in an arc shape, its front part being made of plastic, and its rear part being made of metal and connected to an electrostatic discharge wire.

[0015] Preferably, the lower part of the folding plate 7 in this embodiment of the invention is covered with antistatic tape, and an antistatic structure 9 is provided between the folding structure and the roller conveying structure 2; the antistatic structure 9 is located on the left or right side of the fabric 1 and is located on the side that is the upper side after the fabric 1 is flipped over; the roller conveying structure 2 includes two plastic rollers arranged side by side and driven synchronously, one of which is a straight roller, and the other plastic roller is composed of a plurality of plastic rings arranged vertically and vertically and is located on the same side as the antistatic structure 9.

[0016] Specifically, in this embodiment of the invention, N is an integer from 3 to 8, and the apex angle of the angled plate 10 is 10-25°.

[0017] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The embodiments of the present invention provide an M-folding device, which can produce products of various specifications (such as different numbers of folds, different folding widths, etc.) by adjusting the rotating frame, folding plate, and corner plate. In addition, this patent uses surface folding instead of rod folding, which generates more static electricity due to friction; various methods are used to remove static electricity. Furthermore, the fabric in this patent is horizontally input and horizontally output after folding, facilitating subsequent processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the M-fold folding device provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0020] Figure 3 This is a top view of the M-folding device provided in an embodiment of the present invention;

[0021] Figure 4 This is a structural diagram of the combination of the rear end of the conveyor plate, the rear end of the folding plate, and the roller traction mechanism;

[0022] Figure 5 This is a diagram illustrating the fabric when it is folded 7 times.

[0023] Figure 6 This is a diagram illustrating the fabric when it is folded 9 times.

[0024] Figure 7 This is a diagram illustrating the fabric when it is folded 6 times.

[0025] Figure 8 This is a diagram showing the fabric when it is folded into three sections.

[0026] Figure 9 yes Figure 5 A schematic diagram of products with different fold widths is generated.

[0027] In the diagram: 1. Fabric, 2. Roller conveyor structure, 3. 90° flipping structure, 4. Frame, 5. Conveyor plate, 6. Input roller, 7. Folding plate, 8. Roller traction mechanism, 9. Static elimination structure, 10. Angle plate, 11. Notch;

[0028] 41 Base, 42 Rotating frame, 43 Spinning shaft, 44 Front door bracket, 45 Rear door bracket, 46 Lifting and adjusting structure, 47 Hinge seat, 48 Universal connector. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] See Figure 1-4 This invention provides an M-folding device, which includes a folding structure, a roller conveying structure 2, and a 90° flipping structure 3 arranged sequentially from front to back. The 90° flipping structure 3 allows the vertical fabric 1 to be flipped to a horizontal position, and it is composed of multiple inclined flipping rods; this is an existing structure. The roller conveying structure 2 is used to convey the fabric 1 backward and to roll and shape the folded fabric 1.

[0031] The folding structure includes a frame 4, a conveyor plate 5, an input roller 6, a roller traction mechanism 8, and N folding plates 7. N is an integer from 3 to 8. The input roller 6 and the roller conveying structure 2 are both driven by corresponding structures with synchronized speeds. The input roller 6 is located below and in front of the conveyor plate 5, arranged horizontally. Horizontal fabric 1 passes behind the input roller 6 and then upwards. The roller traction mechanism 8 (a non-powered structure) is located adjacent to and behind the conveyor plate 5, and is vertically arranged. The roller conveying structure 2 is vertically arranged and located directly behind the roller traction mechanism 8. Vertical fabric 1 passes between the two plastic rollers of the roller conveying structure 2. The folding plates 7 are vertically arranged, with their lower sides horizontal or inclined upwards from front to back (preferably slightly inclined, specifically less than 5°). The conveyor plate 5 is inclined upwards from front to back (adjustable), and is composed of N+1 angular plates 10, with an inclination angle greater than that of the lower side of the folding plates 7. The angled plate 10 is an isosceles triangle with its rear end as the apex angle, and the apex angle of the angled plate 10 is 10-25°. Multiple angled plates 10 are arranged in a fan shape with their apexes aligned. The corresponding sides of adjacent angled plates 10 are parallel, forming a strip channel (arranged radially along the fan shape). A folding plate 7 is arranged along its direction within the strip channel. N folding plates 7 are arranged alternately with N+1 angled plates 10, and there are gaps between the folding plates 7 and the angled plates 10 on both sides to allow the fabric 1 to pass through. The folding plate 7 extends from the front of the conveyor plate 5 to the rear of the conveyor plate 5. Its lower front side is located above the conveyor plate 5, its lower rear side is located below the conveyor plate 5, and its rear end is basically aligned with the rear end of the angled plate 10. Partial (middle or edge) or all of the angled plates 10 fold the fabric 1, with a maximum number of folds of 2N-1 folds. The front ends of multiple angled plates 10 are aligned at the same height; the height of the rear end of the angled plate 10 can be adjusted up and down, and its front end can also be adjusted up and down. The distance between the lower rear end of the folding plate 7 and the rear end of the angle plate 10 can be adjusted to produce products with different folding widths and to accommodate adjustments in the number of folds.

[0032] In this configuration, only adjacent K corner plates 10 fold the fabric 1, where K is less than or equal to N+1. For example... Figure 6-7 For K-shaped corner plates 10, if the end of the folded fabric 1 is located outside the corresponding folding plate 7, then the rear end of the corner plate 10 corresponding to the end of the fabric 1 is lower than the rear ends of the other corner plates 10 to form a low-position corner plate so that the fabric 1 at the end can be lifted up, and the rear ends of the middle corner plates 10 (K-2 or K-1) are flush. Figure 5 and 8 -9. If the end of the folded fabric 1 is located inside the corresponding folding plate 7, the K-block corner plate 10 used for folding is flush.

[0033] Among them, see Figure 1-4 In this embodiment of the invention, the frame 4 includes a base 41, a rotating frame 42, a rotating shaft 43, a front door bracket 44, a rear door bracket 45, and 2N+2 lifting and adjusting structures 46, etc. The input roller 6 is located on the front side of the base 41, and the rotating frame 42 is located above the base 41 and is angularly adjustable on the base 41. The two corner plates 10 at the left and right ends are low-position corner plates. If folding requires low-position corner plates, the rotating frame 42 is adjusted so that the corner plate 10 at the left or right end corresponds to the corresponding end of the fabric 1, and the corner plate 10 at the other end of the fabric 1 is adjusted downwards or not. If folding does not require low-position corner plates, the rotating frame 42 is adjusted so that the fabric 1 is located between the two corner plates 10 at both ends.

[0034] The rotating frame 42 is horizontally positioned, with its rear end rotatably mounted on the base 41 via a vertically positioned pivot 43. Its front end slides on the base 41 via multiple rollers. A front-door bracket 44 and a rear-door bracket 45 are respectively located at its front and rear ends, each with a fan-shaped structure. The front of the base 41 has an arc-shaped track for the rollers to slide on, and a handwheel adjustment mechanism is provided between the track and the rotating frame 42. The arc-shaped track is circular and coaxial with the pivot 43. The pivot 43 is located directly below the center of the fan shape. The front-door bracket 44 is a forward-protruding arc-shaped frame located above the conveyor plate 5 and above the fabric 1. The rear-door bracket 45 is located adjacent to and behind the conveyor plate 5, arranged in a left-right direction. Angle plate 10 is mounted on rotating frame 42 via two lifting adjustment structures 46. Roller traction mechanism 8 is mounted on rear door support 45. Folding plate 7 is arranged radially along a fan shape, with its front and rear ends mounted on front door support 44 and rear door support 45 respectively. The front and rear parts of each angle plate 10 are mounted on rotating frame 42 via lifting adjustment structures 46. The lifting adjustment structure 46 includes a sleeve vertically mounted on rotating frame 42 and a single-rod spherical bearing between the sleeve and the lower side of angle plate 10. The straight rod at the lower part of the single-rod spherical bearing is inserted into the sleeve and locked with bolts. Its upper ring seat is adjustablely positioned on the lower side of angle plate 10 (with elongated holes along the front-rear direction).

[0035] Specifically, see Figure 1-4In this embodiment of the invention, the upper front end of the folding plate 7 is mounted on the top beam of the front door bracket 44 via a hinge seat 47, and its rear end is mounted on the top beam of the rear door bracket 45 via a universal connector 48. The hinge seat 47 is adjustable along the direction of the folding plate 7, and its axis of rotation is perpendicular to the folding plate 7, allowing the folding plate 7 to be adjusted vertically. The universal connector 48 includes a vertically arranged vertical connecting rod, a longitudinal connecting rod arranged in the front-rear direction, a longitudinal motion joint between the upper end of the vertical connecting rod and the front end of the longitudinal connecting rod, and a transverse motion joint in the middle of the longitudinal connecting rod. The vertical connecting rod is located on the upper rear side of the folding plate 7. The axis of rotation of the longitudinal motion joint is horizontally arranged and perpendicular to the folding plate 7, allowing the vertical connecting rod to be adjusted front-rear. The axis of rotation of the transverse motion joint is perpendicular to the axis of rotation of the longitudinal motion joint, allowing the front part of the longitudinal connecting rod to be adjusted left-right. The longitudinal connecting rod is arranged obliquely upwards from front to back, and its rear end is adjustable on the rear door bracket 45. The rear ends of multiple longitudinal connecting rods are close to each other. The longitudinal motion joint is equipped with a limiting bolt to restrict the forward rotation of the vertical connecting rod (e.g., Figure 2 As shown, it is located in front of the vertical connecting rod, and its lower end rests against the protrusion on the front side of the vertical connecting rod.

[0036] In this embodiment of the invention, the roller traction mechanism 8 is located adjacent to the center of the fan-shaped circle and includes two adjustment frames and traction rollers on its inner side. The two adjustment frames are respectively arranged on the two vertical beams of the rear door type bracket 45 in a left-right adjustable manner to facilitate the adjustment of the distance between the two traction rollers (the thickness of the fabric 1 is different, the number of folds is different, etc., and the thickness after folding will change). The two traction rollers are arranged side by side and are located on the left and right sides of the fabric 1 respectively. The traction rollers are arranged vertically.

[0037] Preferably, see Figure 1 and 4 In this embodiment of the invention, the upper rear end of the folding plate 7 is provided with a notch 11 to reduce friction, the rear end of the angle plate 10 is located at the notch 11, and the vertical connecting rod is located in front of the notch 11.

[0038] To reduce friction and remove static electricity, this patent designs the angled plate 10, the folding plate 7, and the roller conveying structure 2. In this embodiment, the angled plate 10 is arranged obliquely upwards from front to back. Its front end (the base of an isosceles triangle) is a right-angled side or a forward-protruding arc-shaped side. Its front end is bent downwards in an arc shape. The front part is made of plastic (specifically, to ensure strength, the upper layer is plastic and the lower layer is metal), and the rear part is made of metal (to ensure strength, the rear end of the angled plate 10 experiences greater force) and is connected to a static discharge wire. The lower part of the folding plate 7 is covered with anti-static tape (which is also relatively smooth). A static elimination structure 9 is provided between the folding structure and the roller conveying structure 2. The static elimination structure 9 is located on the left or right side of the fabric 1, on the side where the fabric 1 is flipped over, and is vertically arranged. The roller conveyor structure 2 includes two plastic rollers arranged side by side and driven synchronously. One of the plastic rollers is a straight roller, and the other plastic roller is composed of multiple plastic rings arranged at intervals and located on the same side as the antistatic structure 9.

[0039] The above description is only a preferred embodiment of the present invention and is 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 M-folding device, characterized in that, The system includes a folding structure, a roller conveying structure (2), and a 90° flipping structure (3) arranged sequentially from front to back. The 90° flipping structure (3) allows the vertical fabric (1) to be flipped to a horizontal position. The folding structure includes a frame (4), a conveying plate (5), an input roller (6), a roller traction mechanism (8), and N folding plates (7). The input roller (6) and the roller conveying structure (2) are driven by corresponding structures and their speeds are coordinated. The input roller (6) is located in front of and below the conveying plate (5) and is arranged in the left-right direction. The roller traction mechanism (8) is located adjacent to and behind the conveying plate (5) and is arranged vertically. The roller conveying structure (2) is arranged vertically and is located directly behind the roller traction mechanism (8). The folding plate (7) is arranged vertically and its lower side is horizontal or diagonally upward from front to back. The conveyor plate (5) is arranged obliquely upward from front to back, and it is composed of N+1 angular plates (10). Its tilt angle is greater than the tilt angle of the lower side of the folding plate (7). The angle plate (10) is an isosceles triangle with its rear end being the apex. Multiple angle plates (10) are arranged in a fan shape with their apex aligned. The corresponding sides of adjacent angle plates (10) are parallel to form a strip channel. A folding plate (7) is provided in the strip channel along its direction. N folding plates (7) and N+1 angle plates (10) are arranged alternately. The folding plate (7) has a gap with the angle plates (10) on both sides. The folding plate (7) extends from the front of the conveying plate (5) to the rear of the conveying plate (5), with its lower front side located above the conveying plate (5) and its lower rear side located below the conveying plate (5). Some or all of the angle plates (10) fold the fabric (1), with a maximum number of folds of 2N-1; the front ends of multiple angle plates (10) are aligned at the same height, the rear end of the angle plates (10) can be adjusted up and down, and the distance between the lower rear end of the folding plate (7) and the rear end of the angle plate (10) can be adjusted. The frame (4) includes a base (41), a rotating frame (42), a rotating shaft (43), a front door bracket (44) and a rear door bracket (45). The input roller (6) is located on the front side of the base (41). The rotating frame (42) is located above the base (41) and is angularly adjustable on the base (41). The two corner plates (10) at the left and right ends are low corner plates. If the folding requires the low corner plates, adjust the rotating frame (42) so that the corner plates (10) at the left or right end correspond to the corresponding end of the fabric (1), and adjust the corner plates (10) at the other end of the fabric (1) downwards or without adjusting them. If the folding does not require the low corner plates, adjust the rotating frame (42) so that the fabric (1) is located between the two corner plates (10) at both ends. The rotating frame (42) is horizontally positioned, with its rear end rotatably mounted on the base (41) via a vertically positioned pivot (43). Its front end slides on the base (41) via multiple rollers. A front door-type bracket (44) and a rear door-type bracket (45) are respectively provided at its front and rear ends. The front of the base (41) has an arc-shaped track for the rollers to slide on, and a handwheel adjustment mechanism is provided between the arc-shaped track and the rotating frame (42). The arc-shaped track is coaxial with the pivot (43). Located directly below the center of the fan-shaped structure; the front door bracket (44) is a forward-protruding arc-shaped frame located above the conveyor plate (5); the rear door bracket (45) is located adjacent to the rear of the conveyor plate (5); the angle plate (10) is mounted on the rotating frame (42); the roller traction mechanism (8) is mounted on the rear door bracket (45); the folding plate (7) is arranged radially along the fan-shaped structure and its front and rear ends are respectively mounted on the front door bracket (44) and the rear door bracket (45).

2. The M-folding device according to claim 1, characterized in that, Only the adjacent K corner plates (10) fold the fabric (1), where K is less than or equal to N+1; for the K corner plates (10), if the end of the folded fabric (1) is located outside the corresponding folding plate (7), the rear end of the corner plate (10) corresponding to the end of the fabric (1) is lower than the rear end of the other corner plates (10) to form a low-position corner plate, and the rear end of the middle corner plate (10) is flush.

3. The M-folding device according to claim 1, characterized in that, The frame (4) also includes 2N+2 lifting adjustment structures (46). The front and rear of each angle plate (10) are mounted on the rotating frame (42) via the lifting adjustment structure (46). The lifting adjustment structure (46) includes a sleeve mounted vertically on the rotating frame (42) and a single-rod joint bearing between the sleeve and the lower side of the angle plate (10). The straight rod at the lower part of the single-rod joint bearing is inserted into the sleeve and locked with bolts. The ring seat at the upper part is adjustable and located on the lower side of the angle plate (10).

4. The M-folding device according to claim 1, characterized in that, The upper front end of the folding plate (7) is mounted on the top beam of the front door bracket (44) via a hinge seat (47), and its rear end is mounted on the top beam of the rear door bracket (45) via a universal connector (48). The hinge seat (47) can be adjusted along the direction of the folding plate (7), and its axis of rotation is perpendicular to the folding plate (7). The universal connector (48) includes a vertically arranged vertical connecting rod, a longitudinal connecting rod arranged along the front-rear direction, a longitudinal motion joint between the upper end of the vertical connecting rod and the front end of the longitudinal connecting rod, and the middle part of the longitudinal connecting rod. The lateral movement joint has a vertical connecting rod located on the upper rear part of the folding plate (7). The axis of rotation of the longitudinal movement joint is horizontal and perpendicular to the folding plate (7), allowing the vertical connecting rod to be adjusted forward and backward. The axis of rotation of the lateral movement joint is perpendicular to the axis of rotation of the longitudinal movement joint, allowing the front part of the longitudinal connecting rod to be adjusted left and right. The longitudinal connecting rod is arranged obliquely upward from front to back, and its rear part is adjustable forward and backward on the rear door bracket (45). The longitudinal movement joint is provided with a limiting bolt to restrict the forward rotation of the vertical connecting rod.

5. The M-folding device according to claim 4, characterized in that, The roller traction mechanism (8) is located adjacent to the center of the fan and includes two adjustment frames and traction rollers on its inner side. The two adjustment frames are respectively adjustable to the left and right on the two vertical beams of the rear door bracket (45). The two traction rollers are arranged side by side and are located on the left and right sides of the fabric (1). The traction rollers are arranged vertically.

6. The M-folding device according to claim 4, characterized in that, The upper rear end of the folding plate (7) is provided with a notch (11), the rear end of the angle plate (10) is located at the notch (11), and the vertical connecting rod is located in front of the notch (11).

7. The M-folding device according to claim 1, characterized in that, The angled plate (10) is arranged obliquely upward from front to back. Its front end is a right-angled side or a forward-protruding arc side. Its front end is bent downward in an arc. Its front part is made of plastic, and its rear part is made of metal and connected to an electrostatic discharge wire.

8. The M-folding device according to claim 7, characterized in that, The lower part of the folding plate (7) is covered with antistatic tape, and an antistatic structure (9) is provided between the folding structure and the roller conveying structure (2); the antistatic structure (9) is located on the left or right side of the fabric (1) and is located on the side that is the upper side after the fabric (1) is flipped over; the roller conveying structure (2) includes two plastic rollers arranged side by side and driven synchronously, one of which is a straight roller, and the other plastic roller is composed of multiple plastic rings arranged vertically and vertically and is located on the same side as the antistatic structure (9).

9. The M-folding device according to claim 1, characterized in that, N is an integer from 3 to 8, and the apex angle of the angled plate (10) is 10-25°.

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