Reducing cutter mechanism

Abstract

The invention discloses a reducing cutter mechanism which comprises a rack, a plurality of cutter mechanisms and cutter groove rollers capable of getting away from or getting close to the cutter mechanisms are installed in the rack, a sliding shaft driven by a motor to move in the length direction is installed in a cutter shaft base of each cutter mechanism, and a plurality of shear type stretching assemblies are symmetrically installed on the two sides of each cutter shaft base. The shear type stretching assemblies are provided with fixed shafts and movable shafts, the fixed shafts are installed on the cutter shaft seats, the movable shafts are installed on the sliding shafts, the cutter plate assembly matched with the cutter groove roller is installed between the two symmetrical shear type stretching assemblies, and the rotating radius of the cutter plate assembly can be adjusted in real time through stretching and contracting of the shear type stretching assemblies. The packaging bag cutting device can be quickly adapted to production of packaging bags with different length specifications, and when small-size packaging bags are produced, two groups of cutting board assemblies are symmetrically mounted, so that the operation mode that two times of cutting are completed through single-circle rotation is realized, and the cutting frequency in unit time is doubled; and for a large-size packaging bag, the single-tool mode can be flexibly switched, and diversified production requirements can be met.

Description

Technical Field

[0001] This invention relates to a production line for packaging bags such as cement bags and chemical bags, and in particular to a variable diameter cutting mechanism. Background Technology

[0002] In the production of packaging bags such as cement bags and chemical bags, paper rolls, as the core raw material, need to be processed into shape through multiple key processes such as gluing, cutting, and bag making. Among them, the cutting process directly determines the dimensional accuracy and production efficiency of the packaging bags, and is an important link affecting product quality and production efficiency. In existing technologies, the cutting process typically relies on the rotational motion of a cutting tool mechanism. Its working principle is as follows: the cutter rotates with the mechanism, and after each cut, it must rotate one full revolution back to the initial cutting position before the next cut can be performed. The circumference of the cutter's rotation radius directly corresponds to the length of the packaging bag. However, this traditional cutting tool mechanism has significant technical limitations: on the one hand, because the radius of the cutting tool mechanism is fixed, when producing packaging bags of different sizes, the entire cutting tool mechanism needs to be replaced. This not only increases equipment adjustment time and labor costs but also reduces production flexibility and continuity. On the other hand, due to limitations such as the weight of the cutting tool mechanism and its structural stability, the rotational speed of the cutter cannot be significantly increased, resulting in low efficiency—only one cut can be completed per revolution—which restricts the overall production line's capacity improvement. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a variable diameter cutting mechanism.

[0004] The technical solution adopted by this invention to solve its technical problem is: A variable diameter cutting mechanism includes a frame, within which a conveyor roller assembly for feeding paper is installed. Several cutting mechanism units are also installed within the frame. Corresponding to each cutting mechanism, a slotted roller is mounted on the frame that can move away from or closer to the cutting mechanism. Each cutting mechanism includes a cutting shaft seat, within which a sliding shaft driven by a motor and moving along its length is installed. Several sets of scissor-type extension assemblies are symmetrically mounted on both sides of the cutting shaft seat. Each scissor-type extension assembly has a fixed shaft and a moving shaft. The fixed shaft is mounted on the cutting shaft seat, and the moving shaft is mounted on the sliding shaft. A blade plate assembly that cooperates with the slotted roller is installed between two symmetrical scissor-type extension assemblies.

[0005] A lifting plate is slidably mounted inside the frame via a slide rail. The line connecting the centers of the cutting tool mechanism and the cutting groove roller is parallel to the length direction of the slide rail. The cutting groove roller is mounted on the lifting plate.

[0006] The scissor extension assembly includes a first fixed rotating arm, a second fixed rotating arm, a first movable rotating arm, and a second movable rotating arm. One end of the first fixed rotating arm and the second fixed rotating arm are mounted on the cutter shaft seat via the fixed shaft. The other end of the first fixed rotating arm is mounted on the first movable rotating arm via the first hinge shaft. The other end of the second fixed rotating arm is mounted on the second movable rotating arm via the second hinge shaft. The first movable rotating arm and the second movable rotating arm are mounted on the sliding shaft via the movable shaft.

[0007] The first and second rotating arms extend outwards to have mounting portions, and the blade assembly is mounted on the end of the mounting portion.

[0008] The blade assembly includes a support plate, on both sides of which are hinged along the length direction a plurality of arranged clips are mounted. The clips are U-shaped and their openings are clamped to the side of the support plate. A blade plate for mounting a cutting blade is detachably mounted between the top surface of the support plate and the clips. A slidable connecting rod is mounted on the bottom of the support plate, and a push block is mounted on the connecting rod corresponding to the opening of the clip. The clips are provided with an inclined surface corresponding to the push block.

[0009] One end of the connecting rod is equipped with a swing arm that rotates synchronously with the rotating nut. A guide wheel is installed at the end of the swing arm. The support plate has an end bearing installed at the same end of the swing arm. An "L"-shaped groove is provided on the end bearing. The guide wheel is movably installed in the "L"-shaped groove. A spring for resetting the connecting rod is installed at the other end of the support plate.

[0010] The "L"-shaped groove has a locking slot on its side wall along the length of the support plate.

[0011] The two symmetrical clips are connected at their bottoms by a tension spring.

[0012] The blade plate is provided with several mounting holes for accommodating different cutting blades.

[0013] The frame is provided with insertion holes for inserting the blade plate.

[0014] The beneficial effects of this invention are as follows: This invention has several tool mechanisms installed within a frame. Corresponding to these tool mechanisms, the frame has grooved rollers that can move away from or closer to the tool mechanisms. Each tool mechanism includes a tool shaft seat, within which a sliding shaft driven by a motor and moving along its length is installed. Several sets of scissor-type extension assemblies are symmetrically installed on both sides of the tool shaft seat. Each scissor-type extension assembly has a fixed shaft and a moving shaft. The fixed shaft is mounted on the tool shaft seat, and the moving shaft is mounted on the sliding shaft. Between two symmetrical scissor-type extension assemblies, a blade assembly that cooperates with the grooved rollers is installed. By extending and retracting the scissor-type extension assemblies, the rotation radius of the blade assembly can be adjusted in real time, allowing for rapid adaptation to the production of packaging bags of different lengths. When producing small-sized packaging bags, by symmetrically installing two sets of blade assemblies, a single-turn rotation completes two cuts, doubling the number of cuts per unit time and increasing the production capacity by one time compared to traditional single-blade mechanisms. For large-sized packaging bags, a flexible single-blade mode can be switched, ensuring cutting stability while accommodating diverse production needs. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram of the lifting connecting plate; Figure 3 This is a structural diagram of the cutting tool mechanism; Figure 4 This is an exploded view of the tool mechanism; Figure 5 This is one of the structural diagrams of a scissor-type extension assembly; Figure 6 This is the second structural diagram of the scissor-type extension assembly; Figure 7 This is one of the structural diagrams of the blade assembly; Figure 8 This is the second structural diagram of the blade assembly; Figure 9 This is an exploded view of the blade assembly; Figure 10 This is a structural diagram of the clip; Figure 11 This is a structural diagram of the end bearing component. Detailed Implementation

[0017] 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 and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0018] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0019] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0020] Reference Figure 1-11 A variable diameter cutting mechanism includes a frame 1, within which a conveyor roller group 2 for feeding paper is installed, and within the frame 1 are several cutting tool mechanisms 4 (attached). Figure 1 The image shows only one set of the aforementioned tool mechanism 4 and groove roller 3 structure. The frame 1 is equipped with a groove roller 3 that can move away from or closer to the tool mechanism 4. The tool mechanism 4 includes a tool shaft seat 5. A sliding shaft 7 driven by a motor 6 to move along the length direction is installed inside the tool shaft seat 5. Several sets of scissor extension assemblies 8 are symmetrically installed on both sides of the tool shaft seat 5. Each scissor extension assembly 8 is equipped with a fixed shaft 9 and a moving shaft 10. The fixed shaft 9 is installed on the tool shaft seat 5, and the moving shaft 10 is installed on the sliding shaft 7. A symmetrical scissor extension assembly 8 is installed between each other. The blade assembly 11, which cooperates with the groove roller 3, drives the sliding shaft 7 via the motor 6 to extend and retract the scissor extension assembly 8. The rotation radius of the blade assembly 11 can be adjusted in real time, allowing for quick adaptation to the production of packaging bags of different lengths. When producing small-sized packaging bags, by symmetrically installing two sets of blade assemblies 11, a single-turn rotation completes two cuts, doubling the number of cuts per unit time and increasing the production capacity by one time compared to the traditional single-blade mechanism. For large-sized packaging bags, the system can flexibly switch to single-blade mode, ensuring cutting stability while accommodating diverse production needs.

[0021] A lifting plate 13 is slidably mounted inside the frame 1 via a slide rail 12. The line connecting the centers of the cutter mechanism 4 and the groove roller 3 is parallel to the length direction of the slide rail 12. The groove roller 3 is mounted on the lifting plate 13.

[0022] When the rotation radius of the blade assembly 11 changes, the relationship between the blade and the groove roller 3 also changes. Therefore, the groove roller 3 needs to change in accordance with the change of the blade assembly 11. For example, if the radius of the blade assembly 11 increases by 5 mm, the groove roller 3 needs to move 5 mm away from the blade assembly 11 to re-engage the blade assembly 11 and the groove roller 3. If the groove roller 3 does not move, the blade will collide with the blade due to the increase in the rotation radius of the blade assembly 11.

[0023] Furthermore, the slide rail 12 is symmetrically fixed inside the frame 1, and a slider 36 is installed on the outer side of the lifting connecting plate 13 corresponding to the slide rail 12, and the slider 36 is slidably installed on the slide rail 12.

[0024] Furthermore, the motor 6 uses a lead screw and lead screw nut or other conventional transmission mechanism to drive the sliding shaft 7 to slide. Similarly, a lead screw and lead screw nut or other conventional transmission mechanism can also be used to drive the lifting connecting plate 13 to slide (e.g., Figure 2 As shown in A), the transmission mechanisms on both sides achieve synchronous transmission through the transmission link 45.

[0025] The scissor-type extension assembly 8 includes a first fixed rotating arm 14, a second fixed rotating arm 15, a first movable rotating arm 16, and a second movable rotating arm 17. One end of the first fixed rotating arm 14 and the second fixed rotating arm 15 are mounted on the cutter shaft seat 5 via the fixed shaft 9. The other end of the first fixed rotating arm 14 is mounted on the first movable rotating arm 16 via the first hinge shaft 43. The other end of the second fixed rotating arm 15 is mounted on the second movable rotating arm 17 via the second hinge shaft 44. The first movable rotating arm 16 and the second movable rotating arm 17 are mounted on the sliding shaft 7 via the movable shaft 10. By levering the principle, the movement stroke of the sliding shaft is amplified, realizing a wide range of radius adjustment for the cutter assembly. The structure is highly rigid and has excellent load-bearing capacity.

[0026] The first movable rotating arm 16 and the second movable rotating arm 17 extend outward to have mounting portions 18, and the blade assembly 11 is mounted on the end of the mounting portion 18.

[0027] Furthermore, the mounting part 18 is provided with a mounting hole 42, and the blade assembly 7 is provided with a mounting shaft 37 corresponding to the mounting hole 42, and the mounting shaft 37 is installed in the mounting hole 42.

[0028] The cutter shaft seat 5 is provided with an elongated hole 38 corresponding to the sliding trajectory of the moving shaft 10, which provides precise guiding constraint for the moving shaft 10, ensuring that the trajectory is stable when the sliding shaft drives each moving arm to move, avoiding deviation and jamming, and ensuring the smooth extension and contraction of the scissor assembly.

[0029] The blade assembly 11 includes a support plate 19. Several clamps 20 are hinged to both sides of the support plate 19 along its length. Each clamp 20 has a U-shaped structure, and its opening is clamped to the side of the support plate 19. A blade plate 22 for mounting a cutter 21 is detachably mounted between the top surface of the support plate 19 and the clamps 20. A slidable connecting rod 23 is mounted on the bottom of the support plate 19, and a pusher is mounted on the connecting rod 23 corresponding to the opening of the clamps 20. Block 24, the clamp 20 is provided with an inclined surface 25 corresponding to the push block 24. During installation, the blade 22 is inserted between the top surface of the support plate 19 and the clamp 20. Pulling the connecting rod 23 causes the push block 24 to slide along the inclined surface 25, causing the clamp 20 to rotate, thereby pressing the blade 22 onto the support plate 19. During disassembly, pushing the connecting rod 23 to reset it means that no external force is applied to the clamp 20, and the blade 22 can be easily pulled out. The operation is simple and convenient.

[0030] The bottom of the support plate 19 is provided with a groove 39, and the connecting rod 23 is installed in the groove 39. The groove 39 is located at the position of the clamp 20 and has a notch 40 in the direction of the clamp 20. The two sides of the push block 24 extend into the notch 40, and the inclined surface 25 is located at the notch 40. Since the cutter 21 is facing the product, the bottom of the support plate 19 is suitable for installation on the machine. When assembled on the machine, only the bottom of the support plate 19 abuts against the installation position, and the entire push block 24 is hidden inside the support plate 19. The design of all components extending beyond the bottom of the support plate 19 can reduce the structure of the assembly surface and make installation more convenient.

[0031] One end of the connecting rod 23 is equipped with a swing arm 27 that rotates synchronously with the rotating nut 26. A guide wheel 28 is installed at the end of the swing arm 27. The support plate 19 has an end bearing 29 installed at the same end of the swing arm 27. An "L"-shaped groove 30 is provided on the end bearing 29. The guide wheel 28 is movably installed in the "L"-shaped groove 30. A spring 31 for resetting the connecting rod 23 is installed at the other end of the support plate 19.

[0032] The worker rotates the rotating nut 26 using a tool (such as a wrench), and the swing arm 27 rotates synchronously, causing the guide wheel 28 to rotate around the rotating nut 26. When the guide wheel 28 rolls relative to the "L"-shaped groove 30, the swing arm 27 moves accordingly (at the same time, the spring 31 is further compressed; after the movement is completed, the length direction of the swing arm 27 is consistent with the stretching direction of the spring 31). The rotating nut 26 moves outward, thereby pushing out the connecting rod 23. At this time, the push block 24 moves towards the clamp 20 and slides along the inclined surface 25, causing the clamp 20 to rotate, thereby pressing the blade plate 22 onto the support plate 19, thus completing the installation of the blade plate 22. When the worker rotates the rotating nut 26 in the opposite direction, the length direction of the swing arm 27 forms an angle with the stretching direction of the spring 31, and the spring 31 can pull the connecting rod 23 to reset. At this time, the blade plate 22 can be pulled out.

[0033] The frame 1 is provided with an insertion hole 35 for inserting the blade plate 22. When the blade plate 22 is disassembled or assembled, first rotate the blade plate assembly 11 to align the blade plate 22 with the insertion hole 35, rotate the rotating nut 26 to reset the connecting rod 23, and release the clamp 20 from pressing the blade plate 22. At this time, the blade plate 22 can be pulled out from the insertion hole 35.

[0034] The L-shaped groove 30 has a slot 32 on its side wall along the length of the support plate 19. After the blade plate 22 is installed, the guide wheel 28 is engaged in the slot 32, which serves as a limit and prevents it from being released automatically.

[0035] The two symmetrical clips 20 are connected at their bottoms by a tension spring 33. When the blade plate 22 is not inserted, the tension spring 33 pulls the clips 20 tight, causing the clips 20 to tend to move away from the top surface of the support plate 19. This keeps the distance between the clips 20 and the top surface of the support plate 19 at its maximum, making it easier to insert the blade plate 22.

[0036] The support plate 19 has several hinge seats 41 arranged along its length on both sides, and the clip 20 is hingedly installed in the hinge seats 41.

[0037] The support plate 19 has several hinge seats 32 arranged along its length on both sides, and the clip 20 is hingedly installed in the hinge seat 32.

[0038] The blade plate 22 is provided with a number of mounting holes 34 for adapting to different cutting blades, which can be compatible with the installation requirements of cutting blades of different specifications and types, expand the applicability of the mechanism, eliminate the need to customize blade plates for different cutting blades, and reduce equipment adaptation costs.

[0039] In this invention, the term "a plurality of" refers to two or more unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present 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.

[0042] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A variable diameter cutting mechanism, comprising a frame (1), wherein a conveyor roller assembly (2) for conveying paper is installed within the frame (1), characterized in that... The frame (1) is equipped with several cutting tool mechanisms (4). The frame (1) is equipped with a cutting groove roller (3) that can move away from or closer to the cutting tool mechanism (4) in the direction of the cutting tool mechanism (4). The cutting tool mechanism (4) includes a cutting shaft seat (5). A sliding shaft (7) driven by a motor (6) to move along the length direction is installed in the cutting shaft seat (5). Several sets of scissor extension assemblies (8) are symmetrically installed on both sides of the cutting shaft seat (5). The scissor extension assembly (8) is equipped with a fixed shaft (9) and a moving shaft (10). The fixed shaft (9) is installed on the cutting shaft seat (5), and the moving shaft (10) is installed on the sliding shaft (7). A blade plate assembly (11) that cooperates with the cutting groove roller (3) is installed between two symmetrical scissor extension assemblies (8).

2. The variable diameter cutting mechanism according to claim 1, characterized in that... The frame (1) is slidably mounted with a lifting plate (13) via a slide rail (12). The line connecting the centers of the cutting tool mechanism (4) and the cutting groove roller (3) is parallel to the length direction of the slide rail (12). The cutting groove roller (3) is mounted on the lifting plate (13).

3. The variable diameter cutting mechanism according to claim 1, characterized in that... The scissor extension assembly (8) includes a first fixed rotating arm (14), a second fixed rotating arm (15), a first movable rotating arm (16), and a second movable rotating arm (17). One end of the first fixed rotating arm (14) and the second fixed rotating arm (15) are mounted on the cutter shaft seat (5) via the fixed shaft (9). The other end of the first fixed rotating arm (14) is mounted on the first movable rotating arm (16) via the first hinge shaft. The other end of the second fixed rotating arm (15) is mounted on the second movable rotating arm (17) via the second hinge shaft. The first movable rotating arm (16) and the second movable rotating arm (17) are mounted on the sliding shaft (7) via the movable shaft (10).

4. The variable diameter cutting mechanism according to claim 3, characterized in that... The first movable rotating arm (16) and the second movable rotating arm (17) extend outward to have mounting portions (18), and the blade assembly (11) is mounted on the end of the mounting portion (18).

5. The variable diameter cutting mechanism according to claim 1, characterized in that... The blade assembly (11) includes a support plate (19). Several clamps (20) are hinged to both sides of the support plate (19) along the length direction. The clamps (20) are U-shaped. The openings of the clamps (20) are clamped to the side of the support plate (19). A blade plate (22) for mounting a cutter (21) is detachably installed between the top surface of the support plate (19) and the clamps (20). A slidable connecting rod (23) is installed at the bottom of the support plate (19). A push block (24) is installed on the connecting rod (23) corresponding to the opening of the clamp (20). The clamp (20) is provided with an inclined surface (25) corresponding to the push block (24).

6. The variable diameter cutting mechanism according to claim 5, characterized in that... One end of the connecting rod (23) is equipped with a swing arm (27) that rotates synchronously with the rotating nut (26). A guide wheel (28) is installed at the end of the swing arm (27). The support plate (19) is located at the same end of the swing arm (27) and has an end bearing (29) installed thereon. An "L"-shaped groove (30) is provided on the end bearing (29). The guide wheel (28) is movably installed in the "L"-shaped groove (30). A spring (31) for resetting the connecting rod (23) is installed at the other end of the support plate (19).

7. The variable diameter cutting mechanism according to claim 5, characterized in that... A slot (32) is provided on the side wall of the "L"-shaped groove (30) in the length direction of the support plate (19).

8. The variable diameter cutting mechanism according to claim 5, characterized in that... The bottoms of the two symmetrical clips (20) are connected by a tension spring (33).

9. The variable diameter cutting mechanism according to claim 5, characterized in that... The blade plate (22) is provided with a number of mounting holes (34) for adapting to different cutting blades.

10. The variable diameter cutting mechanism according to claim 5, characterized in that... The frame (1) is provided with insertion holes (35) for inserting the blade plate (22).

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