An arcuate knife device

Abstract

The application discloses an arc-shaped knife device and belongs to the technical field of sheet processing equipment. The arc-shaped knife device comprises a rack, a knife roller and a supporting roller, the knife roller and the supporting roller are rotationally connected with the rack, the knife roller comprises a supporting shaft and two knife bodies, the two knife bodies are slidably connected with the supporting shaft through a connecting mechanism, the supporting shaft is provided with an adjusting mechanism for adjusting the distance between the two knife bodies, the supporting shaft is rotationally connected with the rack through a sliding seat, the sliding seat is slidably connected with the rack, and the rack is provided with a driving mechanism for driving the sliding seat to slide. The two knife bodies can slide on the supporting shaft, the distance between the two knife bodies can be adjusted through the adjusting mechanism, different sheet widths can be adapted, different shearing styles can be realized by adjusting the distance between the two knife bodies, and the knife roller has replaceable applicability.

Description

Technical Field

[0001] This invention relates to the field of sheet processing equipment technology, and in particular to an arc-shaped blade device. Background Technology

[0002] When cutting sheets in batches, curved blade devices are often required. These devices utilize a blade roller with a curved blade and a support roller to press against each other, allowing the sheet material to be cut according to the shape of the curved blade. Existing blade rollers are generally customized according to the shape requirements of the product, which limits their use. Therefore, a new type of curved blade device is needed to solve this problem. Summary of the Invention

[0003] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an arc-shaped knife device.

[0005] To achieve the above objectives, the technical solution of the present invention is: an arc-shaped cutter device, comprising a frame, a cutter roller, and a support roller, wherein the cutter roller and the support roller are rotatably connected to the frame, the cutter roller includes a support shaft and two cutter bodies, the two cutter bodies are slidably connected to the support shaft via a connecting mechanism, the support shaft is provided with an adjusting mechanism for adjusting the distance between the two cutter bodies, the support shaft is rotatably connected to the frame via a slide block, the slide block is slidably connected to the frame, and the frame is provided with a driving mechanism for driving the slide block to slide.

[0006] By adopting the above technical solution, two blades that can slide on the support shaft are used. The distance between the two blades can be adjusted by the adjustment mechanism, thereby adapting to different sheet widths or achieving different cutting patterns by adjusting the distance between the blades. This makes the blade roller replaceable. The drive mechanism can drive the slide block to move the blade roller upward, forming a gap with the support roller. This facilitates the threading of the sheet and prevents the sliding of the blades from damaging the support roller.

[0007] Preferably, the connecting mechanism includes two connecting discs and a plurality of connecting rods. Two support shafts are provided, and the two support shafts are rotatably connected to both sides of the frame. The two connecting discs are fixedly connected to the two support shafts respectively. The plurality of connecting rods are fixedly connected to the two connecting discs respectively, and each connecting rod, and the plurality of connecting rods on the two connecting discs, are slidably connected to the two blade bodies. This invention utilizes a plurality of connecting rods fixed to the connecting discs, allowing the blade bodies to slide and be adjusted. Simultaneously, the connecting discs can transmit rotation to the blade bodies. The connecting discs are rotatably connected to the frame via support shafts, and the blade bodies are driven by rotating the support shafts.

[0008] Preferably, the adjusting mechanism includes an adjusting shaft disposed between the two connecting discs, with both ends of the adjusting shaft rotatably connected to the two connecting discs respectively. Both blades are threadedly connected to the adjusting shaft, and the threads between the two blades and the adjusting shaft have opposite directions of rotation. The adjusting shaft is provided with a limiting mechanism to restrict the relative rotation between the adjusting shaft and the blades. In this invention, the two ends of the adjusting shaft rotate relative to the two connecting discs, allowing the adjusting shaft to rotate relative to the blades. Through the threaded connection between the blades and the adjusting shaft, when the adjusting shaft rotates, the two blades will move closer or further apart under the action of the threads with opposite directions of rotation, thereby achieving the effect of adjusting the spacing. The relative rotation between the adjusting shaft and the blades and connecting discs can be limited by the limiting mechanism, so that the adjusting shaft will not rotate relative to the blades when the blades are rotating.

[0009] Preferably, the limiting mechanism includes a friction sleeve, a friction ring, and a slide rod. The slide rod is connected to the adjusting shaft, the friction sleeve is sleeved on the slide rod, and the friction sleeve is slidably connected to the slide rod. An elastic element is provided between the friction sleeve and the slide rod. The friction ring is fixedly connected to the blade body and has an annular groove. The friction sleeve is inserted into the annular groove. The slide rod is provided with a fixing structure for limiting the sliding of the friction sleeve. This invention utilizes the elastic element to ensure that the friction sleeve is tightly embedded in the annular groove of the friction ring. Both the head of the friction sleeve and the friction ring are made of plastic, and their mutual pressure generates significant friction. This friction limits the relative rotation between the adjusting shaft and the blade body, pushing the friction sleeve to overcome the elastic force of the elastic element and slide. This allows the friction sleeve to disengage from the annular groove of the friction ring, thereby releasing the restriction on the adjusting shaft. The fixing mechanism keeps the friction sleeve in a disengaged state from the friction ring, facilitating subsequent operations.

[0010] Preferably, the fixing structure includes a locking post and a limiting guide groove. The limiting guide groove is formed on the friction sleeve. The locking post is fixedly connected to the sliding rod, and the friction sleeve is rotatably connected to the sliding rod. This invention utilizes an L-shaped limiting guide groove. By pulling the friction sleeve, the locking post on the sliding rod is engaged in the vertical portion of the limiting guide groove. Then, by rotating the friction sleeve, the locking post enters the horizontal portion of the limiting guide groove, thus restricting the axial sliding of the friction sleeve.

[0011] Preferably, the slide rod is rotatably connected to the adjusting shaft. After the friction sleeve disengages from the annular groove and is fixed by the fixing mechanism, the slide rod can be rotated to a vertical position, thus serving as a handle for rotating the adjusting shaft.

[0012] Preferably, the driving mechanism includes a screw and an adjusting block. The adjusting block is threadedly connected to the screw, and the screw is rotatably connected to the frame. The top surface of the adjusting block abuts against the bottom surface of the slide block, and both abutting surfaces of the adjusting block and the slide block are inclined surfaces. This invention utilizes the threaded connection between the adjusting block and the screw, allowing the adjusting block to slide when the screw is rotated. Combined with the inclined surfaces between the adjusting block and the slide block, and the weight of the slide block, this enables the slide block to slide up and down.

[0013] Preferably, both the support roller and the cutter roller are equipped with pulleys, and the two pulleys are interconnected by a belt. The pulley on the support roller is driven by a motor, and the frame is equipped with a tensioning mechanism for tensioning the belt. This invention achieves the transmission relationship between the support roller and the cutter roller through a belt and pulleys. The motor is connected to the pulley on the support roller, providing power to the entire device. The tensioning mechanism automatically tensions the belt after the slide moves the cutter roller, maintaining the transmission relationship between the pulley and the motor. This allows the motor's self-locking mechanism to restrict the rotation of the connecting disc and the cutter body on the cutter roller, enabling relative rotation between the adjusting shaft and the cutter body.

[0014] Preferably, the tensioning mechanism includes two tensioning rollers, which are respectively disposed on both sides of the pulley on the cutter roller, and the height of the two tensioning rollers is higher than that of the pulley. The two pulleys and the two tensioning rollers are interconnected by a belt. The tensioning rollers are connected to the frame via a slider, which is rotatably connected to the tensioning rollers and slidably connected to the frame. An elastic element two is disposed between the slider and the frame. This invention utilizes the elastic element two in a compressed state to allow both tensioning rollers to apply upward thrust to the belt, thereby achieving belt tensioning. When the slide block moves the cutter roller upward, the elastic element two releases its elastic force, causing the slider to slide, which in turn drives the tensioning rollers to tension the belt again, thus ensuring that the transmission relationship between the cutter roller and the motor is maintained.

[0015] Preferably, the slide block is fixedly connected to two support rods, which are located on opposite sides of the top of the slide block. Pressure plates are slidably connected to the two support rods, and elastic elements are sleeved on both support rods. Both elastic elements are positioned between the pressure plates and the slide block. A drive rod is rotatably connected to the frame, and the drive rod is threadedly connected to the pressure plates. This invention utilizes the elastic elements positioned between the slide block and the pressure plates to allow the cutter roller to apply pressure to the support roller using the elastic force generated by the compression of the elastic elements. This results in a better shearing effect for the cutter roller and reduces the number of cases where cuts are not made. Rotating the drive rod allows the threaded drive to move the pressure plates, thereby adjusting the distance between the pressure plates and the slide block, and thus adjusting the elastic force of the elastic elements.

[0016] In summary, the beneficial effects of this invention are: 1. By using two blades that can slide on the support shaft, the distance between the two blades can be adjusted through an adjustment mechanism, thereby adapting to different sheet widths or achieving different cutting patterns by adjusting the distance between the blades, thus making the blade roller replaceable.

[0017] 2. The drive mechanism can drive the slide block to move the cutter roller upward, forming a gap between it and the support roller. This facilitates the threading of the sheet and prevents the sliding of the cutter from damaging the support roller.

[0018] 3. The elastic element allows the friction sleeve to be tightly fitted into the groove of the friction ring. Both the head of the friction sleeve and the friction ring are made of plastic. The mutual pressure can generate a large friction force. The friction force is used to limit the relative rotation between the adjusting shaft and the cutter body. The friction sleeve is fixed by the fixing mechanism and rotated to a vertical position, which can be used as a handle when rotating the adjusting shaft, making the rotation more effortless.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0020] Undoubtedly, such and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and figures.

[0021] To make the above and other objects, features and advantages of the present invention more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0023] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure; Figure 2 Schematic diagram of cross-section structure Figure 1 ; Figure 3 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a schematic diagram of the side structure; Figure 5 Schematic diagram of cross-section structure Figure 2 .

[0026] Explanation of main reference numerals: 1. Frame; 2. Support roller; 3. Support shaft; 4. Cutter body; 5. Slide; 6. Connecting plate; 7. Connecting rod; 8. Adjusting shaft; 9. Friction sleeve; 10. Friction ring; 11. Slide rod; 12. Elastic element one; 13. Locking pin; 14. Limiting guide groove; 15. Screw; 16. Adjusting block; 17. Pulley; 18. Belt; 19. Tensioning wheel; 20. Slider; 21. Elastic element two; 22. Support rod; 23. Pressure plate; 24. Elastic element three; 25. Drive rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies are not connected through a transitional structure, but rather formed as a whole through a connecting structure. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] like Figure 1-5 As shown, an arc-shaped cutter device includes a frame 1, a cutter roller, and a support roller 2. Both the cutter roller and the support roller 2 are rotatably connected to the frame 1. The cutter roller includes a support shaft 3 and two cutter bodies 4. The two cutter bodies 4 are slidably connected to the support shaft 3 through a connecting mechanism. The support shaft 3 is provided with an adjustment mechanism for adjusting the distance between the two cutter bodies 4. The support shaft 3 is rotatably connected to the frame 1 through a slide block 5. The slide block 5 is slidably connected to the frame 1. The frame 1 is provided with a driving mechanism for driving the slide block 5 to slide.

[0032] By adopting the above technical solution, two blades 4 that can slide on the support shaft 3 are used. The distance between the two blades 4 can be adjusted by the adjustment mechanism, so as to adapt to different sheet widths or to achieve different cutting patterns by adjusting the distance between the blades 4. This makes the blade roller replaceable. The drive mechanism can drive the slide block 5 to slide and drive the blade roller to move upward, forming a gap with the support roller 2. This not only facilitates the threading of the sheet, but also prevents the sliding of the blades 4 from damaging the support roller 2.

[0033] The connecting mechanism includes two connecting discs 6 and several connecting rods 7. Two support shafts 3 are provided, and each support shaft 3 is rotatably connected to one side of the frame 1. The two connecting discs 6 are fixedly connected to the two support shafts 3. The several connecting rods 7 are fixedly connected to the two connecting discs 6, and each connecting rod 7 on the two connecting discs 6 is slidably connected to one of the two blade bodies 4. The connecting rods 7 fixed to the connecting discs 6 allow the blade bodies 4 to slide against the connecting discs 6, enabling adjustment of the blade bodies 4. Simultaneously, the connecting discs 6 can transmit rotation to the blade bodies 4. The connecting discs 6 are rotatably connected to the frame 1 via the support shafts 3. Driving the support shafts 3 to rotate drives the blade bodies 4.

[0034] The adjustment mechanism includes an adjustment shaft 8, which is positioned between two connecting discs 6. Both ends of the adjustment shaft 8 are rotatably connected to the two connecting discs 6. Two cutter bodies 4 are threadedly connected to the adjustment shaft 8, with the threads between the two cutter bodies 4 and the adjustment shaft 8 rotating in opposite directions. The adjustment shaft 8 is equipped with a limiting mechanism to restrict the relative rotation between the adjustment shaft 8 and the cutter bodies 4. The rotation of the adjustment shaft 8 between the two connecting discs 6 allows relative rotation between the adjustment shaft 8 and the cutter bodies 4. Through the threaded connection between the cutter bodies 4 and the adjustment shaft 8, when the adjustment shaft 8 rotates, the two cutter heads will move closer or further apart under the action of the oppositely rotating threads, thus achieving the effect of adjusting the spacing. The relative rotation between the adjustment shaft 8 and the cutter bodies 4 and connecting discs 6 can be limited by the limiting mechanism, preventing relative rotation between the adjustment shaft 8 and the cutter heads when the cutter bodies 4 are rotating.

[0035] The limiting mechanism includes a friction sleeve 9, a friction ring 10, and a slide rod 11. The slide rod 11 is connected to the adjusting shaft 8. The friction sleeve 9 is sleeved on the slide rod 11 and is slidably connected to the slide rod 11. An elastic element 12 is provided between the friction sleeve 9 and the slide rod 11. The friction ring 10 is fixedly connected to the cutter body 4. The friction ring 10 has an annular groove, and the friction sleeve 9 is inserted into the annular groove. The slide rod 11 is provided with a fixing structure for limiting the sliding of the friction sleeve 9. The friction sleeve 9 is tightly fitted into the annular groove of the friction ring 10 by using the elastic element 12. Both the head of the friction sleeve 9 and the friction ring 10 are made of plastic, and the mutual pressure can generate a large friction force. The friction force restricts the relative rotation between the adjusting shaft 8 and the cutter body 4, and pushes the friction sleeve 9 to slide against the elastic force of the elastic element 12, so that the friction sleeve 9 can be disengaged from the annular groove of the friction ring 10, thereby releasing the restriction on the adjusting shaft 8. The fixing mechanism can keep the friction sleeve 9 in the state of being disengaged from the friction ring 10, thereby facilitating subsequent operations.

[0036] The fixing structure includes a locking post 13 and a limiting guide groove 14. The limiting guide groove 14 is formed on the friction sleeve 9. The locking post 13 is fixedly connected to the slide rod 11, and the friction sleeve 9 is rotatably connected to the slide rod 11. Using the L-shaped limiting guide groove 14, by pulling the friction sleeve 9, the locking post 13 on the slide rod 11 is engaged in the vertical part of the limiting guide groove 14. Then, by rotating the friction sleeve 9, the locking post 13 is engaged in the horizontal part of the limiting guide groove 14, so that the locking post 13 can restrict the axial sliding of the friction sleeve 9.

[0037] The slide rod 11 is rotatably connected to the adjusting shaft 8. After the friction sleeve 9 is disengaged from the annular groove and fixed by the fixing mechanism, the slide rod 11 can be rotated to make it vertical, thus serving as a handle for rotating the adjusting shaft 8.

[0038] The drive mechanism includes a screw 15 and an adjusting block 16. The adjusting block 16 is threadedly connected to the screw 15, and the screw 15 is rotatably connected to the frame 1. The top surface of the adjusting block 16 abuts against the bottom surface of the slide block 5, and both abutting surfaces of the adjusting block 16 and the slide block 5 are inclined surfaces. The threaded connection between the adjusting block 16 and the screw 15 allows the adjusting block 16 to slide when the screw 15 is rotated. Combined with the inclined surfaces between the adjusting block 16 and the slide block 5, and the weight of the slide block 5, this allows the slide block 5 to slide up and down.

[0039] Both the support roller 2 and the cutter roller are equipped with pulleys 17, which are connected to each other via a belt 18. The pulleys 17 on the support roller 2 are driven by a motor, and the frame 1 is equipped with a tensioning mechanism for tensioning the belt 18. The transmission relationship between the support roller 2 and the cutter roller is realized through the belt 18 and the pulleys 17. The motor is connected to the pulleys 17 on the support roller 2 to provide power for the entire device. The tensioning mechanism can automatically tension the belt 18 after the slide 5 drives the cutter roller to move, so that the pulleys 17 and the motor still maintain the transmission relationship. Thus, the self-locking of the motor can restrict the rotation of the connecting disc 6 and the cutter body 4 on the cutter roller, allowing the adjusting shaft 8 to rotate relative to the cutter body 4.

[0040] The tensioning mechanism includes two tensioning rollers 19, which are respectively disposed on both sides of the pulley 17 on the cutter roller. The height of the two tensioning rollers 19 is higher than that of the pulley 17. The pulley 17 and the two tensioning rollers 19 are connected to each other by a belt 18. The tensioning rollers 19 are connected to the frame 1 through a slider 20. The slider 20 is rotatably connected to the tensioning rollers 19 and slidably connected to the frame 1. An elastic element 21 is provided between the slider 20 and the frame 1. The elastic element 21, when in a compressed state, allows both tensioning rollers 19 to apply upward thrust to the belt 18, thereby tensioning the belt 18. When the slide block 5 moves the cutter roller upward, the elastic element 21 releases its elastic force, causing the slider 20 to slide. This causes the slider 20 to drive the tensioning rollers 19 to tension the belt 18 again, thus ensuring that the transmission relationship between the cutter roller and the motor is maintained.

[0041] The slide 5 is fixedly connected to two support rods 22, which are located on both sides of the top of the slide 5. Pressure plates 23 are slidably connected to the two support rods 22. Elastic elements 24 are fitted onto each support rod 22 and are positioned between the pressure plates 23 and the slide 5. A drive rod 25 is rotatably connected to the frame 1 and threadedly connected to the pressure plates 23. Through the elastic elements 24 positioned between the slide 5 and the pressure plates 23, the cutter roller can apply pressure to the support roller 2 using the elastic force generated by the compression of the elastic elements 24, thereby improving the cutting effect and reducing the number of cases where the cutter fails to cut. Rotating the drive rod 25 allows the pressure plates 23 to move via the thread, thus adjusting the distance between the pressure plates 23 and the slide 5, and consequently adjusting the elastic force of the elastic elements 24.

[0042] It should be noted that many specific details have been set forth in the above description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

Claims

1. An arc-shaped cutter device, comprising a frame (1), a cutter roller, and a support roller (2), wherein the cutter roller and the support roller (2) are rotatably connected to the frame (1), characterized in that: The cutter roller includes a support shaft (3) and two cutter bodies (4). The two cutter bodies (4) are slidably connected to the support shaft (3) through a connecting mechanism. The support shaft (3) is provided with an adjustment mechanism for adjusting the distance between the two cutter bodies (4). The support shaft (3) is rotatably connected to the frame (1) through a slide (5). The slide (5) is slidably connected to the frame (1). The frame (1) is provided with a driving mechanism for driving the slide (5) to slide. The connecting mechanism includes two connecting discs (6) and several connecting rods (7). There are two support shafts (3), and the two support shafts (3) are rotatably connected to both sides of the frame (1). The two connecting discs (6) are fixedly connected to the two support shafts (3), and the several connecting rods (7) are fixedly connected to the two connecting discs (6). Each connecting rod (7) is slidably connected to the two blade bodies (4). The adjustment mechanism includes an adjustment shaft (8), which is disposed between the two connecting discs (6), and both ends of the adjustment shaft (8) are rotatably connected to the two connecting discs (6) respectively. Both blades (4) are threadedly connected to the adjustment shaft (8), and the threads between the two blades (4) and the adjustment shaft (8) are opposite in direction. The adjustment shaft (8) is provided with a limiting mechanism for limiting the relative rotation of the adjustment shaft (8) and the blades (4). The limiting mechanism includes a friction sleeve (9), a friction ring (10), and a slide rod (11). The slide rod (11) is connected to the adjusting shaft (8). The friction sleeve (9) is sleeved on the slide rod (11) and the friction sleeve (9) is slidably connected to the slide rod (11). An elastic element (12) is provided between the friction sleeve (9) and the slide rod (11). The friction ring (10) is fixedly connected to the blade body (4). The friction ring (10) has an annular groove. The friction sleeve (9) is inserted into the annular groove. The slide rod (11) is provided with a fixing structure for limiting the sliding of the friction sleeve (9). The fixing structure includes a locking post (13) and a limiting guide groove (14). The limiting guide groove (14) is formed on the friction sleeve (9). The locking post (13) is fixedly connected to the slide rod (11), and the friction sleeve (9) is rotatably connected to the slide rod (11). The slide bar (11) is rotatably connected to the adjusting shaft (8).

2. The arc-shaped knife device according to claim 1, characterized in that: The driving mechanism includes a screw (15) and an adjusting block (16). The adjusting block (16) is threadedly connected to the screw (15). The screw (15) is rotatably connected to the frame (1). The top surface of the adjusting block (16) abuts against the bottom surface of the slide (5). The abutting surfaces of the adjusting block (16) and the slide (5) are both inclined surfaces.

3. The arc-shaped knife device according to claim 1, characterized in that: Both the support roller (2) and the cutter roller are provided with pulleys (17), and the two pulleys (17) are connected to each other by a belt (18). The pulleys (17) on the support roller (2) are driven by a motor, and the frame (1) is provided with a tensioning mechanism for tensioning the belt (18).

4. The arc-shaped knife device according to claim 3, characterized in that: The tensioning mechanism includes two tensioning wheels (19), which are respectively disposed on both sides of the pulley (17) on the cutter roller, and the height of the two tensioning wheels (19) is higher than that of the pulley (17). The two pulleys (17) and the two tensioning wheels (19) are connected to each other by the belt (18). The tensioning wheel (19) is connected to the frame (1) by a slider (20). The slider (20) is rotatably connected to the tensioning wheel (19) and slidably connected to the frame (1). An elastic element (21) is provided between the slider (20) and the frame (1).

5. The arc-shaped knife device according to claim 1, characterized in that: The slide (5) is fixedly connected to two support rods (22), which are located on both sides of the top of the slide (5). A pressure plate (23) is slidably connected to the two support rods (22). An elastic element (24) is sleeved on each of the two support rods (22). The two elastic elements (24) are both arranged between the pressure plate (23) and the slide (5). The frame (1) is rotatably connected to a drive rod (25), which is threadedly connected to the pressure plate (23).

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