Paper special-shaped edge cutting device

Abstract

The utility model relates to the technical field of paper edge cutting, in particular to a paper special-shaped edge cutting device. The edge cutting device comprises an abutting roller, an edge cutting roller, a rotating driving piece and a moving driving piece. The surface of the abutting roller is sleeved with a deformable first flexible sleeve. The surface of the edge cutting roller is sleeved with an edge cutting ring, the edge cutting ring comprises a plurality of edge cutting units which are sequentially arranged in the circumferential direction of the edge cutting roller, and each edge cutting unit comprises a plurality of cutting side edges; an edge cutting channel for paper to pass through is formed between the abutting roller and the edge cutting roller; the movable driving part drives the abutting roller or / and the edge cutting roller to move, so that the edge cutting ring abuts against the first flexible sleeve, and the first flexible sleeve deforms; the rotation driving part drives the edge cutting roller and the edge cutting ring to rotate so that the multiple cutting side edges can cut paper in sequence. The paper edge cutting device is suitable for edge cutting of soft, thin and easy-to-deform paper.

Description

Technical Field

[0001] The utility model relates to the technical field of paper edge trimming, in particular to a device for trimming special-shaped edges of paper. Background Art

[0002] During the paper production process, in order to meet the paper size requirements, both sides of the paper need to be trimmed, and usually a corresponding paper trimming device needs to be used for the trimming work.

[0003] Existing paper trimming devices usually use blades to trim both sides of a paper. Generally, they can only trim the side edges of the paper smoothly and flatly, and cannot cut out paper with different edge shapes.

[0004] Patent document CN209289426U discloses a corrugated cardboard cutting device comprising a work platform for placing corrugated cardboard, a cutting mechanism disposed above the work platform, and a telescopic mechanism for driving the cutting mechanism up and down. The work platform comprises a base plate, support legs fixed below the base plate, fixed baffles fixed to the front and rear edges of the base plate, a top plate fixedly connected to the upper end of the fixed baffles, an elastic support with its lower end fixed to the base plate, and a pressure plate fixed to the upper end of the elastic support. During use, the distance between the screw rods of the trimming blades and the mounting base plate is adjusted according to the desired trimming requirements of the corrugated cardboard. The trimming blades at the edges of the corrugated cardboard to be trimmed are adjusted downward, while the trimming blades corresponding to the edges of the corrugated cardboard not to be trimmed are removed or adjusted upward. A cylinder drives a telescopic arm downward, and the mounting base plate presses the corrugated cardboard downward along with the telescopic arm. The lower trimming blade cuts the edge of the corrugated cardboard on the pressure plate, while the higher trimming blade does not cut the corrugated cardboard, thereby enabling the cutting of edges of different desired shapes.

[0005] This prior art suffers from the following problems: First, it is only suitable for trimming irregular edges on thicker, harder corrugated cardboard that is less susceptible to deformation under stress, but is not suitable for thinner, softer, and more easily deformed paper, such as cigarette wrapping paper and tipping paper. The inventors analyze this issue: This is primarily because each irregularly shaped unit in an irregular edge has multiple cutting edges. The prior art approach involves simultaneously pressing down on and cutting multiple cutting blades to create the irregular unit. For example, the rectangular unit in the prior art embodiment has three cutting edges: the longitudinal cutting blade, the front transverse cutting blade, and the rear transverse cutting blade simultaneously press down to create the rectangular unit. However, for thin, soft paper, if the edges are subjected to multiple downward forces simultaneously, the pressure area is relatively large, and the edges can easily deform and fold, causing the cutting line to deviate from the intended path, compromising the trimming effect. Second, when cutting other edge shapes, the prior art requires changing the shape of each cutting blade and adjusting the height of each cutting blade, which is complex and prone to errors. Utility Model Content

[0006] The utility model aims to solve the above problems and provides a cutting device which can cut various irregular-shaped edges from thin, soft and easily deformed paper, especially cigarette paper.

[0007] The technical solution to the problem solved by the present invention is to provide a device for trimming the irregular edges of paper, comprising an abutting roller, a trimming roller, a rotating drive member and a movable drive member; the surface of the abutting roller is covered with a first deformable flexible sleeve; the surface of the trimming roller is covered with a trimming ring, the trimming ring comprises a plurality of trimming units arranged in sequence along the circumferential direction of the trimming roller, the trimming unit comprising a plurality of cutting side edges; a trimming channel for paper to pass through is formed between the abutting roller and the trimming roller; the movable drive member drives the abutting roller and / or the trimming roller to move, so that the trimming ring is pressed against the first flexible sleeve and the first flexible sleeve is deformed; the rotating drive member drives the trimming roller and the trimming ring to rotate, so that the plurality of cutting side edges cut the paper in sequence.

[0008] As a preferred embodiment of the present invention, the trimming unit includes a side surface and a front surface away from the trimming roller, and the edge between the front surface and the side surface forms the cutting side edge; the front surface includes a pressing portion that can press against the paper during the rotary trimming process.

[0009] As a preference of the present invention, the front side and / or the side side includes an anti-wear portion that can never come into contact with the paper during the rotary trimming process, and the anti-wear portion is arranged between the pressing portion and the cutting side edge.

[0010] As a preferred embodiment of the present invention, the trimming ring further includes a connecting portion, and a plurality of the trimming units are connected to one connecting portion; the connecting portion is in interference connection with the trimming roller.

[0011] As a preferred embodiment of the present invention, the trimming roller sleeve is provided with a second flexible sleeve, and the trimming ring sleeve is provided on the second flexible sleeve; the side of the connecting portion close to the second flexible sleeve includes an abutting portion, and a raised portion protruding in a direction close to the second flexible sleeve relative to the abutting portion; the abutting portion abuts against the second flexible sleeve, and the raised portion presses against the second flexible sleeve and causes the second flexible sleeve to be concave and deformed.

[0012] As a preferred embodiment of the present invention, the connecting portion includes a first half ring and a second half ring, and two ends of the first half ring are respectively connected to two ends of the second half ring through elastic members.

[0013] As a preferred embodiment of the present invention, the trimming roller is provided with two trimming rings, and a Teflon sleeve is provided between the two trimming rings.

[0014] As a preferred embodiment of the present invention, a gap is provided between the trimming unit and the trimming roller, and the end of the Teflon sleeve is inserted into the gap.

[0015] As a preferred embodiment of the present invention, a lubricating layer is provided on the surface of the first flexible sleeve.

[0016] As a preferred embodiment of the present invention, it further includes a transport roller group for transporting paper through the trimming channel.

[0017] Beneficial effects of the utility model:

[0018] 1. This application provides a method for rotary cutting of irregularly shaped edges. Under the rotary structure, the multiple cutting edges of the trimming unit cut the paper sequentially, rather than simultaneously as in the prior art. Therefore, each cut applies only a single linear pressure to the paper, rather than the surface pressure resulting from the combination of multiple linear pressures as in the prior art. This reduces the likelihood of paper deformation and effectively ensures effective trimming. Based on this, the trimming device of this application is suitable for various papers, especially soft, thin, and easily deformed papers, and particularly suitable for cigarette paper.

[0019] 2. In this application, edges of different shapes can be cut simply by replacing the trimming ring of the trimming unit with different shapes. The operation is simple and the application range is wide.

[0020] 3. In some embodiments, a pressing portion is provided to stabilize the edge after a single side edge cut, preventing deformation that could cause the next side edge cut to deviate from the path, thereby ensuring effective trimming. In some embodiments, a wear-resistant portion is provided to prevent the edge from being rubbed by the solid parts of the trimming unit near the cut side edge, causing it to move and deform with the rotation of the trimming unit, thereby ensuring effective trimming.

[0021] 4. In some embodiments, the trimming ring is in interference connection with the trimming roller to prevent the trimming ring from moving during the trimming process and affecting the trimming effect.

[0022] 5. In some embodiments, a Teflon sleeve and / or a lubricating layer is provided to prevent the paper body from being damaged due to excessive friction between the abutting roller and the trimming roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of the overall structure of a device for trimming irregular-shaped edges of paper;

[0024] Figure 2 The present invention is a structural schematic diagram of an embodiment of an abutting roller and a trimming roller in a device for trimming irregular-shaped edges of paper;

[0025] Figure 3 The present invention is a schematic structural diagram of another embodiment of an abutting roller and a trimming roller in a device for trimming irregular-shaped edges of paper;

[0026] Figure 4 The present invention is a schematic diagram of an embodiment of a trimming unit in a device for trimming irregular-shaped edges of paper;

[0027] Figure 5 This is a schematic diagram of another embodiment of a trimming unit in a device for trimming irregular-shaped edges of paper;

[0028] Figure 6 This is a schematic diagram of another embodiment of a trimming unit in a device for trimming irregular-shaped edges of paper;

[0029] Figure 7 The present invention is a schematic diagram of the working of a device for trimming irregular-shaped edges of paper;

[0030] Figure 8 The present invention is a front view of an embodiment of a trimming roller and a trimming ring in a device for trimming irregular edges of paper;

[0031] Figure 9 The present invention is a side view of an embodiment of a trimming roller and a trimming ring in a device for trimming irregular edges of paper;

[0032] In the figure: abutment roller 1, first flexible sleeve 11, trimming roller 2, second flexible sleeve 21, Teflon sleeve 22, trimming ring 3, connecting part 31, abutment part 311, protrusion 312, elastic member 313, trimming unit 32, cutting side edge 321, pressing part 322, anti-wear part 323, rotating drive member 41, moving drive member 42, transport roller group 5. DETAILED DESCRIPTION

[0033] The following are specific implementations of the present invention, and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0034] A device for trimming irregular edge of paper, such as Figure 1 、 2 3, it includes an abutting roller 1, a trimming roller 2, a rotating drive member 41, and a moving drive member 42. The surface of the abutting roller 1 is covered with a deformable first flexible sleeve 11, and the surface of the trimming roller 2 is covered with a trimming ring 3. In this application, the moving drive member 42 drives the abutting roller 1 and the trimming roller 2 to clamp the paper, and clamp them to a state where the trimming ring 3 can deform the first flexible sleeve 11; then the rotating drive member 41 drives the trimming roller 2 and the trimming ring 3 to rotate to trim the paper.

[0035] The abutting roller 1 and the trimming roller 2 are arranged in parallel, so that a trimming channel for paper to pass through is formed between the abutting roller 1 and the trimming roller 2. In some embodiments, two parallel support plates can be provided, and the abutting roller 1 and the trimming roller 2 are both arranged between the two support plates.

[0036] In some embodiments, in order to make the paper always in a tensioned state in the trimming channel to improve the trimming effect and to improve the trimming efficiency, as shown in FIG. Figure 1 As shown, the paper also includes a transport roller group 5 for transporting paper through the trimming channel. The structure of the transport roller group 5 is not limited and can be any roller group commonly used in the prior art, for example, including at least a payout shaft, a first pressing group, a second pressing group, and a take-up shaft. The first and second pressing groups each include two press rollers. Paper is unwound from the payout shaft, smoothed between the two press rollers of the first press roller group, and then fed into the trimming channel and maintained tensioned on the first flexible sleeve 11 of the abutting roller 1. It is then fed between the two press rollers of the second press roller group for secondary smoothing before being fed to the take-up shaft for rewinding.

[0037] On this basis, in some embodiments, in order to improve the smoothing effect, the distance between the two paper pressing rollers in the first and second pressing groups can be adjusted, for example, one of the paper pressing rollers is connected to a cylinder; for another example, one paper pressing roller is connected to a rotating roller, and the rotating roller is connected to the cylinder through a connecting rod, and the rotating roller is driven to rotate by the movement of the cylinder piston rod, thereby driving the paper pressing roller to press on the other pressing roller to flatten the paper.

[0038] The movable driving member 42 is used to drive the contact roller 1 and / or the trimming roller 2 to move, so as to control the distance of the trimming channel and the cutting force. The structure of the movable driving member 42 is not limited. In some embodiments, it can be as follows: Figure 2 and Figure 3 As shown, a chute is provided on the support plate. The guide direction of the chute is parallel to the direction from the abutting roller 1 to the trimming roller 2. The two ends of the abutting roller 1 are respectively set in the chute by sliders. The moving drive member 42 is a cylinder. The piston rod of the cylinder is connected to the abutting roller 1. The cylinder controls the abutting roller 1 to move along the chute toward or away from the trimming roller 2.

[0039] In this application, the tight contact between the abutting roller 1 and the trimming roller 2 is very important. Generally speaking, the cylinder can prevent the abutting roller 1 from moving away from the trimming roller 2 during the trimming process. In some embodiments, in order to further ensure that the abutting roller 1 does not move in the reverse direction during the trimming process, such as Figure 3 As shown, the top of the slider of the abutting roller 1 is set in an inclined surface, and there is also a connecting rod that cooperates with the inclined surface of the slider, and a counterweight connected to the connecting rod and set above the abutting roller 1. Under the action of the gravity of the counterweight, the connecting rod has a tendency to move downward and pushes the slider to slide toward the trimming roller 2, thereby pushing the abutting roller 1 to press against the surface of the trimming roller 2, thereby ensuring the smooth progress of the cutting work.

[0040] The rotary drive 41 drives the trimming roller 2 and trimming ring 3. The structure of the rotary drive 41 is not limited; in some embodiments, a servo motor can be used. The central axis of the trimming roller 2 passes through the support plate and is connected to the motor's output shaft directly or through a speed reducer. Furthermore, to ensure the rotational stability of the trimming roller 2, each end of the central axis is connected to the two support plates via a rotary bearing.

[0041] The material of the first flexible sleeve 11 sleeved on the surface of the abutting roller 1 is not limited. In some embodiments, a material with good elastic deformation, such as rubber, is used so that after being deformed by an external force, it can return to its original shape when the external force is removed, so that it can continue to press against the trimming roller 2. The installation method of the abutting roller 1 and the first flexible sleeve 11 is not limited. Preferably, the connection is detachable so that the first flexible sleeve 11 can be replaced when it is worn out after long-term use or its deformation is no longer reversible. The detachable connection method is not limited. In some embodiments, it can be as follows Figure 2 As shown, a retaining groove is provided on the surface of the abutment roller 1, and a retaining strip is provided on the inner wall of the first flexible sleeve 11. The retaining groove and the retaining strip cooperate to connect the first flexible sleeve 11 to the abutment roller 1 and prevent relative rotation between the two. In some embodiments, retaining rings can be provided at both ends of the central axis of the abutment roller 1. The central axis of the abutment roller 1 and the retaining rings are both provided with radial holes and connected by radial screws to prevent the retaining rings from axial movement and relative rotation with the abutment roller 1. The two ends of the first flexible sleeve 11 are then abutted against the retaining rings to prevent axial movement of the first flexible sleeve 11 during use.

[0042] According to the need of single-side trimming or double-side trimming, the trimming ring 3 provided on the surface of the trimming roller 2 can be one or two. Figure 2 As shown, when two trimming rings 3 are provided, the two trimming rings 3 are respectively provided at both ends of the trimming roller 2 in the axial direction. In addition, the thickness of the trimming ring 3 in the radial direction of the trimming roller 2 is smaller than the thickness of the first flexible sleeve 11 in the radial direction of the abutting roller 1 to prevent the trimming ring 3 from pressing against the hard body of the abutting roller 1 and causing wear.

[0043] The trimming ring 3 includes a plurality of trimming units 32 arranged in sequence along the circumferential direction of the trimming roller 2. The shape of the trimming unit 32 is determined according to the required edge shape. Figure 4 As shown, the trimming unit 32 is semicircular, so that a wavy edge can be cut. Figure 5 As shown, the trimming unit 32 is triangular, so that a sharp tooth-shaped edge can be cut. Figure 6 As shown, the trimming unit 32 is rectangular, so that it can cut out a square tooth-shaped edge. Figure 4 、 5As can be seen from Figure 6, as long as the edge is irregular or non-linear, the trimming unit 32 always has multiple cutting edges 321. Figure 4 The arc-shaped trimming unit 32 can be viewed as a plurality of very short lines connected in sequence, and these lines are the cutting edges 321 . Figure 5 The triangular trimming unit 32 in FIG. 3 obviously has two cutting side edges 321 . Figure 6 The rectangular trimming unit 32 has three cutting side edges 321. For the sake of convenience, the three cutting side edges 321 are respectively recorded as 321 (a), 321 (b), and 321 (c).

[0044] by Figure 6 Taking the rectangular trimming unit 32 in FIG. 3 as an example, the cutting method of the present application is as follows: Figure 7 As shown, the trimming roller 2 rotates counterclockwise. First, the cutting edge 321(a) axially parallel to the trimming roller 2 contacts the paper for the first linear cut, creating a straight slit perpendicular to the paper's feed direction. Then, the cutting edge 321(b) axially parallel to the trimming roller 2 contacts the paper for the second linear cut, creating a straight slit parallel to the paper's feed direction. This straight slit is continuous with the previous straight slit, forming an L-shaped cut. Finally, the cutting edge 321(c) axially parallel to the trimming roller 2 contacts the paper for the third linear cut, creating a straight slit perpendicular to the paper's feed direction. This straight slit is continuous with the previous L-shaped cut, forming a U-shaped cut. This cut removes a rectangular block from the paper's edge. By continuously conveying the paper and using a number of trimming units 32 spaced apart, multiple rectangular blocks can be cut from the paper's edge at intervals along its feed direction, resulting in a square tooth-shaped edge.

[0045] The trimming unit 32 may be as follows: Figure 4 、 5 The physical structure shown in FIG. 1 includes a front surface away from the trimming roller 2 and a back surface close to the trimming roller 2. The front surface and the back surface are the side surfaces. The edge between the front surface and the side surface forms a cutting side edge 321; it can also be as shown in FIG. Figure 6 The hollow frame structure shown is formed by connecting a number of cutting knives end to end. The blades of the cutting knives are located between the side and front sides of the frame structure and are the cutting side edges 321 .

[0046] Generally speaking, in order to improve the cutting effect, the sharper the cutting side edge 321, the better, so a frame-structured trimming unit 32 is selected. However, in this application, since a sequential cutting method is adopted, the edge will be partially disconnected after the previous cutting side edge 321 is cut. In this case, the edge is more likely to deform. Therefore, in this application, a simple frame structure is not the most preferred. In some embodiments, a pressing portion 322 that can press against the paper during the rotary trimming process needs to be provided. For example, Figure 4 As shown, a solid trimming unit 32 is used to retain its front solid part, and its front solid part can be used as a pressing part 322 to press the paper. Figure 5 As shown, the central part of the front side retains a central part parallel to the plane where the two cutting side edges 321 are located, and this central part is used as the pressing part 322. Figure 6 As shown, a solid block is added in the middle of the frame structure, and its front side is used as the pressing part 322. Figure 7 During the cutting process of the cutting edge 321 ( b ), the pressing portion 322 can press against the paper.

[0047] In some embodiments, based on the pressing portion 322, in order to simultaneously ensure the pressing effect and achieve the sharp cutting effect, the following can be used: Figure 5 As shown, the portion between the cutting side edge 321 and the pressing portion 322 is set as a concave surface that is recessed toward the center of the trimming unit 32, making the cutting side edge 321 relatively sharper. At the same time, because it is a concave surface, it will never contact the paper during the rotary trimming process and will become an anti-wear portion 323. After the cutting side edge 321 completes the cutting, it will not rub against the paper and cause the paper to deform. The side surface can also be set as a concave surface that is recessed toward the center of the trimming unit 32 to serve as the anti-wear portion 323. It can also be as shown in FIG. Figure 6 As shown, a gap is left between the solid block and the frame as the pressing portion 322 to serve as the anti-wear portion 323. At this time, the outer side of the frame can be set to a concave surface that is recessed toward the center of the trimming unit 32 to serve as the anti-wear portion 323. Figure 7 When the cutting edge 321 (a) contacts the paper and continues to cut, since the surfaces on both sides are either concave or empty, it will not contact the paper and drive the paper to move; after the cutting edge 321 (b) cuts a short distance, the pressing part 322 presses on the paper again to keep the paper stable.

[0048] The trimming ring 3 also includes an annular connecting portion 31 to facilitate the connection between the trimming units 32 and the installation and removal of the trimming units 32 from the trimming roller 2. The trimming units 32 are connected to a connecting portion 31. The trimming units 32 are installed by connecting the connecting portion 31 to the trimming roller 2. The connecting portion 31 and the trimming roller 2 are preferably detachably connected to facilitate the replacement of the trimming ring 3 with trimming units 32 of different shapes or the adjustment of the distance between the two trimming rings 3 to adjust the required paper width.

[0049] In some embodiments, on the basis of the detachable connection, the installation stability of the trimming ring 3 on the trimming roller 2 affects the trimming effect, so it is considered to connect the connecting portion 31 with the trimming roller 2 through interference to prevent the trimming ring 3 from rotating and moving. The interference connection method is not limited, for example, Figure 8 、 9 As shown, first, a second flexible sleeve 21 is sleeved on the trimming roller 2. The material and connection method of the second flexible sleeve 21 can refer to the first flexible sleeve 11, ensuring that the second flexible sleeve 21 does not rotate relative to the trimming roller 2 and does not move axially. Next, the trimming ring 3 is sleeved on the second flexible sleeve 21, and the side of the control connection portion 31 close to the second flexible sleeve 21 includes an abutment portion 311 and a protrusion 312 that protrudes relative to the abutment portion 311 in the direction closer to the second flexible sleeve 21. In this application, a ball groove and a ball are provided on the inner ring of the connection portion 31 to form the protrusion 312. The diameter of the ball groove is smaller than the diameter of the ball, so that the ball can roll in the ball groove without falling out of the ball groove. Then when the connecting part 31 is installed to the trimming roller 2, the abutting part 311 abuts against the second flexible sleeve 21, and the protrusion 312 will press against the second flexible sleeve 21 and cause the second flexible sleeve 21 to be concave and deformed, thereby achieving an interference connection and limiting the rotation and movement of the trimming ring 3.

[0050] In some embodiments, in order to facilitate the installation of the trimming ring 3 and further improve the interference fit between the trimming ring 3 and the trimming roller 2, as shown in FIG. Figure 9As shown, the connecting portion 31 includes a first half ring and a second half ring, with the ends of the first half ring connected to the ends of the second half ring via an elastic member 313. The elastic member 313 allows the distance between the first and second half rings to be increased to facilitate the removal and installation of the trimming ring 3. The elastic action of the elastic member 313 also allows the first and second half rings to be tightened to the trimming roller 2. Grooves are provided at the ends of the first and second half rings, with the ends of the elastic member 313 positioned within the grooves. This allows the elastic member 313 to be concealed within the trimming ring 3 when the first and second half rings are connected to form a complete ring body, preventing it from protruding and affecting the trimming function of the trimming ring 3 or being affected by external forces that could affect the installation stability of the trimming ring 3. Furthermore, a positioning groove is provided in the first half ring, and a positioning block is provided in the second half ring. The cooperation between the positioning groove and the positioning block ensures the accuracy of the connection between the first and second half rings.

[0051] In some embodiments, since the paper is clamped between the abutment roller 1 and the trimming roller 2 and requires continuous transport, a lubricating layer may be provided on the abutment roller 1 and the trimming roller 2 to prevent friction between the first flexible sleeve 11 and the second flexible sleeve 21, which could damage the paper during the trimming process. For the trimming roller 2, the lubricating layer should not affect the installation stability of the trimming ring 3. Therefore, in embodiments with two trimming rings 3, a Teflon sleeve 22 is provided between the two trimming rings 3 to reduce friction. The trimming rings 3 still maintain an interference fit with the second flexible sleeve 21. Furthermore, Teflon sleeves 22 of different widths can be interchanged depending on the width of the paper. In some embodiments, to ensure the stability of the Teflon sleeve 22, a gap may be provided between the trimming unit 32 and the trimming roller 2. The end of the Teflon sleeve 22 is inserted into the gap, and the trimming ring 3 compresses the Teflon sleeve 22. In an embodiment where only one edge needs to be trimmed and only one trimming ring 3 is provided, a snap ring can be added on the other side of the trimming roller 2 to stop the circumferential movement of the Teflon sleeve 22. Regarding the abutting roller 1, a lubricating layer, such as a polytetrafluoroethylene coating, can be directly provided on the surface of the first flexible sleeve 11, which has little effect on the trimming effect.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A device for trimming irregular-shaped edges of paper, characterized by: It comprises an abutting roller (1), a trimming roller (2), a rotating driving member (41) and a moving driving member (42); The surface of the abutting roller (1) is covered with a deformable first flexible cover (11); The trimming roller (2) is provided with a trimming ring (3) on its surface, the trimming ring (3) comprising a plurality of trimming units (32) sequentially arranged along the circumferential direction of the trimming roller (2), the trimming units (32) comprising a plurality of cutting side edges (321); a trimming channel for paper to pass through is formed between the abutting roller (1) and the trimming roller (2); The moving drive member (42) drives the contact roller (1) and / or the trimming roller (2) to move, so that the trimming ring (3) is pressed against the first flexible sleeve (11), and the first flexible sleeve (11) is deformed; The rotating driving member (41) drives the trimming roller (2) and the trimming ring (3) to rotate, so that the plurality of cutting side edges (321) cut the paper in sequence; The thickness of the trimming ring (3) along the radial direction of the trimming roller (2) is smaller than the thickness of the first flexible sleeve (11) along the radial direction of the abutting roller (1).

2. The device for trimming irregular-shaped edges of paper according to claim 1, characterized in that: The trimming unit (32) comprises a side surface and a front surface away from the trimming roller (2), wherein the edge between the front surface and the side surface forms the cutting side edge (321); the front surface comprises a pressing portion (322) capable of pressing against the paper during the rotary trimming process.

3. The device for trimming irregular-shaped edges of paper according to claim 2, characterized in that: The front surface and / or side surface includes an anti-wear portion (323) that is always unable to abut against the paper during the rotary trimming process, and the anti-wear portion (323) is arranged between the pressing portion (322) and the cutting side edge (321).

4. The device for trimming irregular-shaped edges of paper according to claim 1, characterized in that: The trimming ring (3) further comprises a connecting portion (31), and a plurality of the trimming units (32) are connected to one of the connecting portions (31); the connecting portion (31) is interference-connected with the trimming roller (2).

5. The device for trimming irregular-shaped edges of paper according to claim 4, characterized in that: The trimming roller (2) is sleeved with a second flexible sleeve (21), and the trimming ring (3) is sleeved on the second flexible sleeve (21); A surface of the connecting portion (31) close to the second flexible sleeve (21) includes an abutting portion (311) and a protruding portion (312) protruding relative to the abutting portion (311) in a direction close to the second flexible sleeve (21); The abutting portion (311) abuts against the second flexible sleeve (21), and the raised portion (312) presses against the second flexible sleeve (21), causing the second flexible sleeve (21) to be concave and deformed.

6. A paper irregular edge trimming device according to claim 4 or 5, characterized in that: The connecting portion (31) comprises a first half ring and a second half ring, and two ends of the first half ring are respectively connected to two ends of the second half ring via elastic members (313).

7. A paper irregular edge trimming device according to claim 1 or 4, characterized in that: The trimming roller (2) is provided with two trimming rings (3), and a Teflon sleeve (22) is provided between the two trimming rings (3).

8. The device for trimming irregular-shaped edges of paper according to claim 7, characterized in that: A gap is provided between the trimming unit (32) and the trimming roller (2), and the end of the Teflon sleeve (22) is inserted into the gap.

9. The device for trimming irregular-shaped edges of paper according to claim 1, characterized in that: A lubricating layer is provided on the surface of the first flexible sleeve (11).

10. The device for trimming irregular-shaped edges of paper according to claim 1, characterized in that: It also includes a transport roller group (5) for transporting paper through the trimming channel.

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