Sofa leather tension cutting device

Abstract

This invention relates to the field of sofa manufacturing technology, specifically a sofa leather tensioning and cutting device. It includes drive mounting plates facing each other, with fixed mounting brackets at the lower ends of each drive mounting plate. Fixed mounting plates are located at the outer ends of the fixed mounting brackets, and each fixed mounting plate has several fixed mounting holes. An arc-shaped mounting plate is located at the upper end of the drive mounting plates. The device also includes a leather cutting mechanism positioned between the arc-shaped mounting plates, comprising a working mounting plate positioned between the arc-shaped mounting plates. Two sets of leather tensioning and guiding mechanisms are symmetrically arranged on the left and right sides of the working mounting plate. Dual-sided tensioning combined with multi-point force transmission ensures the leather is flat and the cutting is stable and precise. A displacement cutting module allows for multi-angle adjustment to meet the processing needs of complex styles. Spacing adjustment and multi-stage telescopic columns adapt to different specifications of leather. A conductive ring, in conjunction with guide columns, ensures stable power supply for dynamic adjustment and reliable operation.

Description

Technical Field

[0001] This invention relates to the field of sofa manufacturing technology, and in particular to a sofa leather tensioning and cutting device. Background Technology

[0002] With the improvement of people's living standards, sofas have become an indispensable piece of furniture in modern homes. In the sofa manufacturing process, leather cutting is a crucial step, as its precision and efficiency directly affect the quality of the finished product and production costs. Traditional leather cutting is mostly done manually, using a cutter to cut along cardboard. However, this manual cutting method is not only inefficient and labor-intensive, but also makes it difficult to guarantee cutting precision, easily resulting in edge burrs or dimensional deviations, which cannot meet the needs of modern mass production.

[0003] To overcome the limitations of manual cutting, a series of mechanized leather cutting devices have emerged on the market. Currently, most common cutting devices use a method of tightening and fixing the leather on all four sides. This involves securing the leather to the cutting table using clamps or pressure rollers, and then the cutting head makes the cut. However, due to the inherent elasticity of leather, this method of tightening and fixing has significant drawbacks in practical applications: after cutting, the leather is prone to shrinkage at the cut due to stress release, causing it to curl and deform; if continuous cutting is performed, the deformed leather may overlap, leading to missed cuts or secondary cutting, significantly reducing the yield.

[0004] Furthermore, while some existing cutting equipment uses laser cutting technology, which enables non-contact processing, it is prone to producing scorch marks and a large heat-affected zone on the cut edges when cutting leather. It also poses a risk of burning natural materials such as genuine leather, affecting the product's appearance quality. On the other hand, cutting equipment using vibrating knives avoids heat damage, but it requires a high degree of tension on the leather during the cutting process. Insufficient or uneven tension can cause the leather to shift or wrinkle during cutting, leading to errors in the cut pattern.

[0005] Regarding the adjustability of the cutting mechanism, existing cutting devices mostly use fixed cutting heads or can only move within a single plane, making it difficult to make flexible adjustments at multiple angles and positions according to the needs of complex curved surfaces or irregular patterns. Although some devices can achieve lifting or translation of the cutting head, they lack axial rotation and deflection adjustment functions, which limits their ability to handle diverse cutting patterns.

[0006] In terms of leather transport and tension adjustment, the guiding mechanism of traditional cutting devices often has a fixed structure, making it difficult to adapt to different widths and thicknesses of leather. When processing leather of different specifications, manual replacement of parts or cumbersome mechanical adjustments are required, which is not only inconvenient to operate but also makes it difficult to guarantee adjustment accuracy. At the same time, during dynamic adjustment, the existing guiding mechanism often suffers from unstable power supply to moving parts due to limitations in the power supply structure, affecting the continuous and reliable operation of the equipment.

[0007] The present invention aims to solve the technical problems existing in the prior art, and to this end, proposes a sofa leather tensioning and cutting device. Summary of the Invention

[0008] The purpose of this invention is to provide a sofa leather tensioning and cutting device to solve the technical problems existing in the prior art.

[0009] By adopting the above technical solution, the present invention has the following beneficial effects: This invention provides a sofa leather tensioning and cutting device, comprising drive mounting plates facing each other, a fixed mounting bracket at the lower end of each drive mounting plate, a fixed mounting plate at the outer end of each fixed mounting bracket, a plurality of fixed mounting holes on the fixed mounting plate, and an arc-shaped mounting plate at the upper end of the drive mounting plate, and further comprising: A leather cutting mechanism is provided between the arc-shaped mounting plates. The leather cutting mechanism includes a working mounting plate provided between the arc-shaped mounting plates. A directional displacement cylinder is provided at the middle position of the working mounting plate, and a displacement cutting module is provided in conjunction with the directional displacement cylinder. Two sets of leather tensioning and guiding mechanisms are symmetrically arranged on the left and right sides of the working mounting plate. The leather tensioning and guiding mechanism includes a spacing adjustment module on the driving mounting plate and a tensioning and guiding module between the spacing adjustment modules.

[0010] As a further aspect of the present invention: several damping guide holes are symmetrically arranged at both ends of the working mounting plate, and damping guide posts are provided at the outer end of the arc-shaped mounting plate in conjunction with the damping guide holes.

[0011] As a further aspect of the present invention: the displacement cutting module includes a directional displacement column that is slidably arranged in conjunction with the directional displacement cylinder, and two symmetrical displacement guide plates are arranged on the upper two sides of the directional displacement column, with the displacement guide plates extending out of the directional displacement cylinder.

[0012] As a further aspect of the present invention: a displacement driving component is provided at the end of the upper displacement guide plate, and drive guide wheels are rotatably provided at both ends of the displacement driving component, with the drive guide wheels contacting the upper side of the working mounting plate.

[0013] As a further embodiment of the present invention: an axial rotation drive is provided at the end of the lower displacement guide plate, an axial rotation mounting bracket is rotatably provided at the lower end of the axial rotation drive, a deflection telescopic column is provided on the axial rotation mounting bracket via a deflection drive shaft, a tool mounting bracket is provided at the outer end of the deflection telescopic column, and a leather cutting knife is provided in conjunction with the tool mounting bracket.

[0014] As a further embodiment of the present invention: the spacing adjustment module includes spacing adjustment mounting plates arranged opposite each other on the left and right ends of the drive mounting plate, a spacing adjustment drive component is horizontally arranged on the drive mounting plate, and adjustment studs are symmetrically arranged at both ends of the spacing adjustment drive component. The spacing adjustment mounting plate is provided with adjustment screw holes in conjunction with the adjustment studs.

[0015] As a further embodiment of the present invention: the left and right ends of the drive mounting plate are symmetrically provided with directional guide posts in conjunction with the adjusting studs, and the ends of the spacing adjustment mounting plate are provided with directional guide holes in conjunction with the directional guide posts.

[0016] As a further embodiment of the present invention: the tensioning guide module includes a U-shaped mounting frame disposed at the outer end of the spacing adjustment mounting plate, and the U-shaped mounting frames on both sides of the drive mounting plate are arranged facing each other front to back, with two guide rollers arranged horizontally between the facing U-shaped mounting frames.

[0017] As a further aspect of the present invention: multiple telescopic columns are symmetrically arranged at both ends of the two guide rollers, and each of the multiple telescopic columns is provided with a guide wheel.

[0018] As a further embodiment of the present invention: a tensioning convex wheel is provided at the outer end of the upper multi-stage telescopic column, and a tensioning concave wheel is provided at the outer end of the lower multi-stage telescopic column.

[0019] As a further aspect of the present invention: a limiting shaft is provided on one side of both the tensioning convex wheel and the tensioning concave wheel, and a limiting rotating sleeve is provided in conjunction with the limiting rotating shaft. The upper and lower ends of the U-shaped mounting bracket are symmetrically provided with directional sliding holes, and the limiting rotating sleeves on both the upper and lower sides are provided with directional sliding pins in conjunction with the directional sliding holes. A limiting piece is provided at the outer end of the directional sliding pin extending out of the directional sliding hole, and a return spring is sleeved on each directional sliding pin. The two ends of the return spring are respectively connected to the limiting piece and the U-shaped mounting bracket.

[0020] As a further embodiment of the present invention: a conductive ring is provided at the outer end of the limiting rotating shaft, an annular conductive groove is provided on the inner side of the limiting rotating sleeve in conjunction with the conductive ring, a sliding conductive groove is provided at the middle position of the U-shaped mounting bracket, and a sliding conductive post is provided on the limiting rotating sleeve in conjunction with the sliding conductive groove.

[0021] Compared with the prior art, the beneficial effects of the present invention are: High cutting precision: The double-sided tensioning and guiding mechanism ensures that the leather remains flat and taut during cutting. Combined with multi-point balanced force transmission, it effectively reduces deformation and ensures stable and precise cutting.

[0022] High processing flexibility: The displacement cutting module can realize a wide range of movement, axial rotation and angular deflection of the cutting blade, which can meet the cutting needs of various complex patterns and has strong adaptability.

[0023] Wide range of applications: Through the spacing adjustment module and multi-stage telescopic columns, the tension and guide spacing can be flexibly adjusted to adapt to leathers of different widths and thicknesses, and it has dynamic self-adaptive capabilities.

[0024] Stable and reliable operation: The guide column, return spring and unique conductive ring power supply structure ensure the smoothness of the adjustment process and the continuous and stable power supply of moving parts during dynamic adjustment. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of a sofa leather tensioning and cutting device.

[0027] Figure 2 This is a schematic diagram of the leather cutting mechanism and spacing adjustment module in a sofa leather tensioning and cutting device.

[0028] Figure 3 This is a partial cross-sectional schematic diagram of the spacing adjustment module in a sofa leather tensioning and cutting device.

[0029] Figure 4 This is a partial cross-sectional schematic diagram of the leather cutting mechanism in a sofa leather tensioning and cutting device.

[0030] Figure 5 This is a three-dimensional structural diagram of a displacement cutting module in a sofa leather tensioning and cutting device.

[0031] Figure 6 This is a three-dimensional structural diagram of the tensioning guide module in a sofa leather tensioning and cutting device.

[0032] Figure 7 This is a three-dimensional schematic diagram of a sofa leather tensioning and cutting device, including a guide roller, multi-stage telescopic column, guide wheel, and limiting shaft.

[0033] Figure 8 for Figure 7 An enlarged schematic diagram of point a in the middle.

[0034] Figure 9 This is a partial cross-sectional schematic diagram of a limiting rotating sleeve in a sofa leather tensioning and cutting device.

[0035] 1-Fixed mounting bracket, 2-Fixed mounting plate, 3-Fixed mounting hole, 4-Drive mounting plate, 5-Gap adjustment drive component, 6-Arc-shaped mounting plate, 7-Working mounting plate, 8-Gap adjustment mounting plate, 9-U-shaped mounting bracket, 10-Guide roller, 11-Directional displacement cylinder, 12-Limiting rotating sleeve, 13-Damping guide post, 14-Adjusting stud, 15-Directional guide post, 16-Adjusting screw hole, 17-Directional guide hole, 18-Sliding conductive post, 19-Sliding conductive groove, 20-Multi-stage telescopic post, 21-Guide wheel 22-Tensioning convex wheel, 23-Tensioning concave wheel, 24-Limiting shaft, 25-Conductive ring, 26-Annular conductive groove, 27-Directional sliding column, 28-Directional sliding hole, 29-Reset spring, 30-Limiting plate, 31-Damping guide hole, 32-Drive guide wheel, 33-Leather cutting knife, 34-Directional displacement column, 35-Displacement drive component, 36-Axial rotation drive component, 37-Axial rotation mounting bracket, 38-Deflection drive shaft, 39-Deflection telescopic column, 40-Tool mounting bracket, 41-Displacement guide plate. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0038] Example 1, please refer to Figure 1 In this embodiment of the invention, a sofa leather tensioning and cutting device includes a drive mounting plate 4 facing each other, a fixed mounting bracket 1 at the lower end of each drive mounting plate 4, a fixed mounting plate 2 at the outer end of each fixed mounting bracket 1, a plurality of fixed mounting holes 3 on the fixed mounting plate 2, and an arc-shaped mounting plate 6 at the upper end of the drive mounting plate 4. The device also includes: A leather cutting mechanism is provided between the arc-shaped mounting plates 6, the leather cutting mechanism including a working mounting plate 7 provided between the arc-shaped mounting plates 6; Two sets of leather tensioning and guiding mechanisms are symmetrically arranged on the left and right sides of the working mounting plate 7.

[0039] The mounting plates 2 on both sides are fixed to the target equipment or to the target support frame through the mounting holes 3; The leather is fed into one set of leather tensioning and guiding mechanisms and then discharged from another set of leather tensioning and guiding mechanisms, so that the leather remains taut during the cutting process, ensuring stable cutting by the leather cutting mechanism. Example 2, based on Example 1, please refer to... Figures 1-5 In this embodiment of the invention, a directional displacement cylinder 11 is provided at the middle position of the working mounting plate 7, and a displacement cutting module is provided in conjunction with the directional displacement cylinder 11. Several damping guide holes 31 are symmetrically provided at both ends of the working mounting plate 7, and damping guide posts 13 are provided at the outer end of the arc-shaped mounting plate 6 in conjunction with the damping guide holes 31. With the cooperation of the damping guide holes 31 and the damping guide posts 13, the working mounting plate 7 does not slide except for the extension and retraction adjustment of the multi-stage telescopic column 20. The displacement cutting module includes a directional displacement column 34 that slides in conjunction with the directional displacement cylinder 11. Two symmetrical displacement guide plates 41 are arranged on the upper part of the directional displacement column 34, each extending out of the directional displacement cylinder 11. A displacement driving component 35 is provided at the end of the upper displacement guide plate 41. Drive guide wheels 32 are rotatably arranged at both ends of the displacement driving component 35, and the drive guide wheels 32 contact the upper side of the working mounting plate 7. An axial rotation driving component 36 is provided at the end of the lower displacement guide plate 41. An axial rotation mounting frame 37 is rotatably arranged at the lower end of the axial rotation driving component 36. A deflection telescopic column 39 is provided on the axial rotation mounting frame 37 via a deflection drive shaft 38. A tool mounting frame 40 is provided at the outer end of the deflection telescopic column 39, and a leather cutting blade 33 is provided in conjunction with the tool mounting frame 40.

[0040] The displacement drive 35 causes the drive guide wheel 32 to rotate, causing the drive guide wheel 32 to roll on the working mounting plate 7. At this time, the directional displacement column 34 slides and shifts along the directional displacement cylinder 11, thereby realizing the displacement movement of the displacement guide plate 41 and the axial rotation drive 36. While the device is moving, the axial rotation drive 36 drives the axial rotation mounting bracket 37 to rotate axially. Then, through the deflection drive shaft 38 and the deflection telescopic column 39, the position and angle of the tool mounting bracket 40 and the leather cutting knife 33 on it are adjusted to meet the needs of different cutting styles.

[0041] Example 3, based on Example 2, please refer to... Figures 6-9In this embodiment of the invention, the leather tensioning and guiding mechanism includes a spacing adjustment module disposed on the drive mounting plate 4, and tensioning and guiding modules disposed between the spacing adjustment modules; The spacing adjustment module includes a spacing adjustment mounting plate 8 with the left and right ends of the drive mounting plate 4 facing each other. A spacing adjustment drive component 5 is horizontally arranged on the drive mounting plate 4. Adjustment studs 14 are symmetrically arranged at both ends of the spacing adjustment drive component 5. Adjustment screw holes 16 are provided on the spacing adjustment mounting plate 8 in conjunction with the adjustment studs 14. Guiding posts 15 are symmetrically arranged on both the left and right ends of the drive mounting plate 4 in conjunction with the adjustment studs 14. Guiding holes 17 are provided at the ends of the spacing adjustment mounting plate 8 in conjunction with the guiding posts 15. The spacing adjustment drive 5 drives the adjusting studs 14 at both ends to rotate. With the cooperation of the adjusting studs 14 and the adjusting screw holes 16, the spacing between the spacing adjustment mounting plate 8 and the drive mounting plate 4 is adjusted, thereby realizing the tension adjustment in the leather guiding direction. At the same time, with the cooperation of the directional guide post 15 and the directional guide hole 17, the stability of the spacing adjustment process is improved. The tensioning guide module includes a U-shaped mounting frame 9 set at the outer end of the spacing adjustment mounting plate 8. The U-shaped mounting frames 9 on both sides of the drive mounting plate 4 are arranged facing each other. Two guide rollers 10 are arranged horizontally between the facing U-shaped mounting frames 9. Multi-stage telescopic columns 20 are symmetrically arranged at both ends of the two guide rollers 10. Each stage of the multi-stage telescopic column 20 is equipped with a guide wheel 21. The outer end of the upper multi-stage telescopic column 20 is equipped with a tensioning convex wheel 22, and the outer end of the lower multi-stage telescopic column 20 is equipped with a tensioning concave wheel 23. One side of each of the tensioning convex wheel 22 and tensioning concave wheel 23 is provided with a limiting pivot 24, and a limiting pivot sleeve 12 is provided in conjunction with the limiting pivot 24. The upper and lower ends of the U-shaped mounting bracket 9 are symmetrically provided with directional sliding holes 28. The limiting pivot sleeves 12 on both the upper and lower sides are provided with directional sliding pins 27 in conjunction with the directional sliding holes 28. The outer ends of the directional sliding pins 27 extending out of the directional sliding holes 28 are provided with limiting plates 30. The directional sliding pins 27 are all fitted with return springs 29. The two ends of the return springs 29 are respectively connected to the limiting plates 30 and the U-shaped mounting bracket 9. The outer end of the limiting rotating shaft 24 is provided with a conductive ring 25, and the inner side of the limiting rotating sleeve 12 is provided with an annular conductive groove 26 in conjunction with the conductive ring 25. The middle position of the U-shaped mounting bracket 9 is provided with a sliding conductive groove 19, and the limiting rotating sleeve 12 is provided with a sliding conductive post 18 in conjunction with the sliding conductive groove 19.

[0042] The leather is fed between two horizontal guide rollers 10. At the same time, the two ends of the leather are squeezed by the cooperation of the tensioning convex rollers 22 and tensioning concave rollers 23 at both ends. Meanwhile, the distance between the tensioning convex rollers 22, tensioning concave rollers 23 and guide rollers 10 is adjusted by the multi-stage telescopic column 20. On the one hand, the tension can be improved, and on the other hand, it can adapt to the tensioning and guiding of leather of different sizes. While the multi-stage telescopic column 20 is being adjusted, the distance between the guide rollers 21 is also adjusted as the length of the multi-stage telescopic column 20 is adjusted. The guide rollers 21 can work with the guide rollers 10 to increase the contact point and contact surface with the leather, improve the force balance of the leather, and reduce the amount of deformation during the cutting process. With the cooperation of the limiting rotating shaft 24 and the limiting rotating sleeve 12, the stable rotation of the guide roller 10 and the guide wheel 21 is ensured. At the same time, with the cooperation of the conductive ring 25 and the annular conductive groove 26, and the cooperation of the sliding conductive groove 19 and the sliding conductive column 18, the stable power supply of the multi-stage telescopic column 20 is ensured. By adjusting the extension and retraction of the limiting plate 30 and the return spring 29, and with the cooperation of the directional sliding hole 28 and the directional sliding column 27, the distance between the upper and lower facing guide rollers 10, the upper and lower facing guide wheels 21, the tensioning convex wheel 22 and the tensioning concave wheel 23 can be dynamically adjusted to adapt to leather of different thicknesses.

[0043] In the description of this specification, the 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 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] 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 sofa leather tension cutting device, comprising driving mounting plates arranged opposite to each other, the lower ends of the driving mounting plates are provided with fixed mounting frames, the outer ends of the fixed mounting frames are provided with fixed mounting plates, and the fixed mounting plates are provided with a plurality of fixed mounting holes, characterized in that, The upper end of the drive mounting plate is provided with an arc-shaped mounting plate, and it also includes: A leather cutting mechanism is provided between the arc-shaped mounting plates. The leather cutting mechanism includes a working mounting plate provided between the arc-shaped mounting plates. A directional displacement cylinder is provided at the middle position of the working mounting plate, and a displacement cutting module is provided in conjunction with the directional displacement cylinder. Two sets of leather tensioning and guiding mechanisms are symmetrically arranged on the left and right sides of the working mounting plate. The leather tensioning and guiding mechanism includes a spacing adjustment module on the driving mounting plate and a tensioning and guiding module between the spacing adjustment modules.

2. A sofa leather tension cutting device according to claim 1, characterized in that, The working mounting plate has several damping guide holes symmetrically arranged at both ends, and the outer end of the arc-shaped mounting plate is equipped with damping guide posts to match the damping guide holes.

3. A sofa leather tension cutting device according to claim 1, characterized in that, The displacement cutting module includes a directional displacement column that slides in conjunction with the directional displacement cylinder. Two symmetrical displacement guide plates are arranged on the upper two sides of the directional displacement column, and the displacement guide plates extend out of the directional displacement cylinder.

4. A sofa leather tension cutting device according to claim 3, characterized in that The upper displacement guide plate is equipped with a displacement drive component, and drive guide wheels are rotatably mounted at both ends of the displacement drive component. The drive guide wheels contact the upper side of the working mounting plate. The lower displacement guide plate is equipped with an axial rotation drive component, and an axial rotation mounting bracket is rotatably mounted at the lower end of the axial rotation drive component. A deflection telescopic column is mounted on the axial rotation mounting bracket via a deflection drive shaft. A tool mounting bracket is mounted on the outer end of the deflection telescopic column, and a leather cutting knife is mounted in conjunction with the tool mounting bracket.

5. A sofa leather tension cutting device according to claim 1, characterized in that, The spacing adjustment module includes a spacing adjustment mounting plate with its left and right ends facing each other. A spacing adjustment driving component is horizontally arranged on the driving mounting plate. Adjusting studs are symmetrically arranged at both ends of the spacing adjustment driving component. Adjusting screw holes are provided on the spacing adjustment mounting plate to cooperate with the adjusting studs. Guiding posts are symmetrically arranged on both ends of the driving mounting plate to cooperate with the adjusting studs. Guiding holes are provided at the ends of the spacing adjustment mounting plate to cooperate with the guiding posts.

6. A sofa leather tension cutting device according to claim 5, characterized in that The tensioning and guiding module includes a U-shaped mounting frame set at the outer end of the spacing adjustment mounting plate, and two U-shaped mounting frames on both sides of the drive mounting plate are arranged facing each other. Two guiding rollers are arranged horizontally between the facing U-shaped mounting frames.

7. A sofa leather tensioning and cutting device according to claim 6, characterized in that, Both ends of the two guide rollers are symmetrically equipped with multi-stage telescopic columns, and each stage of the multi-stage telescopic column is equipped with a guide wheel.

8. A sofa leather tensioning and cutting device according to claim 7, characterized in that, The upper multi-stage telescopic column has a tensioning convex wheel at its outer end, and the lower multi-stage telescopic column has a tensioning concave wheel at its outer end.

9. A sofa leather tensioning and cutting device according to claim 8, characterized in that, One side of each of the tensioning convex and concave wheels is provided with a limiting pivot, and a limiting rotating sleeve is provided in conjunction with the limiting pivot. The upper and lower ends of the U-shaped mounting bracket are symmetrically provided with directional sliding holes. The limiting rotating sleeves on both the upper and lower sides are provided with directional sliding pins in conjunction with the directional sliding holes. The outer ends of the directional sliding pins extending out of the directional sliding holes are provided with limiting plates, and the directional sliding pins are all fitted with return springs. The two ends of the return springs are respectively connected to the limiting plates and the U-shaped mounting bracket.

10. A sofa leather tensioning and cutting device according to claim 9, characterized in that, The outer end of the limiting rotating shaft is provided with a conductive ring, the inner side of the limiting rotating sleeve is provided with an annular conductive groove in conjunction with the conductive ring, the middle position of the U-shaped mounting bracket is provided with a sliding conductive groove, and the limiting rotating sleeve is provided with a sliding conductive post in conjunction with the sliding conductive groove.

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