Backstitch mechanism of industrial sewing machine

Abstract

The utility model discloses a backstitch mechanism of an industrial sewing machine, which relates to the technical field of sewing and comprises a table board, two support legs are fixedly connected to the lower side of the table board, pedals are rotatably connected to opposite surfaces of the two support legs, a power component is fixedly connected to the lower side of the table board, and the power component is rotatably connected to the lower side of the table board. The power assembly is rotationally connected with the pedal through a connecting rod, and the upper side of the table plate is fixedly connected with a machine head. According to the utility model, through the arrangement of the buffer assembly and the anti-bounce assembly, when external vibration is transmitted to the bottom plate, the vibration is absorbed by the first damping spring, and the second damping spring and the third damping spring convert kinetic energy of the distance sensor into elastic potential energy of the two damping springs, so that the distance sensor is prevented from bouncing under the action of the vibration; it is ensured that electronic components in the distance sensor cannot jump when the distance sensor is in a vibration environment for a long time, normal use of the distance sensor is ensured, and it is ensured that a user can accurately switch the backstitching mode.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing, in particular to a reverse sewing mechanism of an industrial sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. When using a sewing machine to sew clothes, handbags and other products, it repeatedly sews more lines back and forth at the starting point or the end. This is called reverse sewing. Some electric sewing machines also have a reverse sewing mechanism that switches the thread direction.

[0003] However, there are still some deficiencies in the reverse stitching mechanism of the current industrial sewing machine. For example, a reverse stitching wrench mechanism for an industrial sewing machine disclosed in Chinese Patent Publication No. CN215829046U, the technical solution of which includes a reverse stitching wrench, an upper limit pin, a torsion spring, an axial position pin, a pressure sensor and other structures, and the reverse stitching wrench is pressed down to cause a pressure change through the pressure sensor to control the start or stop of the reverse stitching or the close stitching, and has the characteristics of high sensing sensitivity, accurate positioning, simple overall structure, and convenient and quick installation. However, the industrial sewing machine will inevitably vibrate frequently during use, and being in a vibrating environment for a long time will also cause the electronic components inside the sensor to jump, which may easily cause the sensor to malfunction. Therefore, a reverse stitching mechanism for an industrial sewing machine is needed to solve the above-mentioned deficiencies. Utility Model Content

[0004] The purpose of the present application is to provide a reverse stitching mechanism for an industrial sewing machine to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a reverse stitch mechanism of an industrial sewing machine, comprising a table top, wherein two supporting legs are fixedly connected to the lower side of the table top, and pedals are rotatably connected to the opposite surfaces of the two supporting legs, a power assembly is fixedly connected to the lower side of the table top, and the power assembly is rotatably connected to the pedal through a connecting rod, a machine head is fixedly connected to the upper side of the table top, a lighting desk lamp is fixedly connected to the upper side of the table top, a bottom plate is fixedly connected to the upper side of the machine head, a dust cover is detachably connected to the upper side of the bottom plate, a avoidance hole is provided on the upper side of the dust cover, a lever is slidably connected to the inner wall of the avoidance hole, a connecting plate is slidably connected to the inner wall of the dust cover, a switching assembly is fixedly connected to the upper side of the connecting plate, a buffer assembly is fixedly connected to the upper side of the bottom plate, a mounting groove is provided on the upper side of the bottom plate, and an anti-jump assembly is fixedly connected inside the mounting groove.

[0006] Preferably, the switching assembly includes two guide bars fixedly connected to the upper side of the connecting plate, the opposite surfaces of the two guide bars are slidably connected with the same connecting slider, the lower side of the connecting slider is slidably connected to the upper side of the connecting plate, the upper side of the connecting plate is fixedly connected with a mounting plate, the upper side of the mounting plate is provided with a U-shaped groove, and the upper side of the connecting plate is fixedly connected with a distance sensor.

[0007] Preferably, the switching assembly also includes a rotating column rotatably connected to the upper side of the connecting plate, the surface of the rotating column is fixedly connected to a mounting sleeve, the inner wall of the mounting sleeve is slidably connected to a movable rod, the end of the movable rod close to the rotating column is fixedly connected to a return spring, the end of the return spring away from the movable rod is fixedly connected to the inner wall of the mounting sleeve, the upper side of the movable rod is fixedly connected to the bottom end of the shift rod, the lower side of the movable rod is fixedly connected to a connecting rod, the surface of the connecting plate is slidably connected to the U-shaped groove, and the lower side of the mounting sleeve is rotatably connected to the upper side of the connecting slider.

[0008] Preferably, the buffer assembly includes a lower sleeve fixedly connected to the upper side of the bottom plate, the surface of the lower sleeve is slidably connected to a connecting ring, the lower side of the connecting plate is fixedly connected to an upper sleeve, the surface of the upper sleeve is slidably connected to the inner wall of the connecting ring, the inner bottom wall of the lower sleeve is fixedly connected to a first damping spring, and the top end of the first damping spring is fixedly connected to the inner top wall of the upper sleeve.

[0009] Preferably, the left and right sides of the connecting ring are fixedly connected with connecting sleeves, the inner walls of the two connecting sleeves are slidably connected with buffer sliders, the side of the buffer slider close to the connecting ring is fixedly connected with a second damping spring, and the end of the second damping spring away from the buffer slider is fixedly connected to the inner wall of the connecting sleeve.

[0010] Preferably, a movable hole is formed through the upper side of the connecting sleeve, the upper side of the buffer slider is rotatably connected to a first buffer rod, one end of the first buffer rod away from the buffer slider is rotatably connected to the lower side of the connecting plate, the lower side of the buffer slider is rotatably connected to a second buffer rod, and one end of the second buffer rod away from the buffer slider is rotatably connected to the upper side of the bottom plate.

[0011] Preferably, the anti-jump assembly includes a light rod fixedly connected to the inner wall of the mounting groove, and two anti-jump sliders are slidably connected to the surface of the light rod, and the opposite surfaces of the two anti-jump sliders are fixedly connected to the same third damping spring, and the upper sides of the two anti-jump sliders are rotatably connected to a third buffer rod, and one end of the third buffer rod away from the anti-jump slider is rotatably connected to the lower side of the connecting plate, and the number of the mounting grooves is two, and the two mounting grooves are symmetrically arranged on the upper side of the base plate with the horizontal midline of the upper side of the base plate as the axis of symmetry.

[0012] In summary, the technical effects and advantages of the utility model are:

[0013] In the utility model, by setting a switching component, when the user toggles the lever, the movement of the lever drives the movable rod to move, and the movement of the movable rod drives the connecting rod and the installation sleeve to move. The movement trajectory of the connecting rod is limited by the reset spring and the U-shaped groove, thereby limiting the stop position of the lever, and the movement of the installation sleeve drives the connecting slider to move. The distance sensor detects that the connecting slider has moved, and the electrical signal sent is transmitted to the machine head. The machine head receives the signal and changes the direction of the threading, and starts the reverse sewing movement. The threading mode is easy to switch, and has the characteristics of high induction sensitivity, accurate positioning, simple overall structure, and convenient and quick installation.

[0014] By setting a buffer component and an anti-jump component, when external vibration is transmitted to the bottom plate, the vibration is absorbed by the first damping spring. When the vibration is large and causes the internal parts to jump, the distance sensor moves downward under the action of inertia, the movement of the distance sensor drives the connecting plate to move downward, the movement of the connecting plate drives the third buffer rod to move downward, and the movement of the third buffer rod drives the two anti-jump sliders to approach each other. At this time, the third damping spring is squeezed to generate elastic force, which hinders the movement trend of the two anti-jump sliders and drives the two anti-jump sliders to stop approaching until they return to their original positions. At the same time, when the connecting plate moves downward, the first buffer rod and the second buffer rod are retracted to each other, pushing the buffer slider to squeeze the second damping spring. The second damping spring is squeezed to generate elastic force, which hinders the movement of the buffer slider until the buffer slider returns to its original position. In essence, by setting the second damping spring and the third damping spring, the kinetic energy of the distance sensor is converted into the elastic potential energy of the two damping springs, thereby avoiding the distance sensor from jumping under the action of vibration, ensuring that the distance sensor is in a vibration environment for a long time without causing the electronic components inside the distance sensor to jump, ensuring the normal use of the distance sensor, and ensuring that the user can accurately switch to the reverse stitching mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the machine head in the embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the dust cover in the embodiment of the present application;

[0019] Figure 4 This is a schematic cross-sectional view of the dust cover in the embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the connecting plate in the embodiment of the present application;

[0021] Figure 6 This is a schematic cross-sectional view of the installation sleeve in the embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of the buffer assembly (connection plate cross-section) in the embodiment of the present application;

[0023] Figure 8 It is a schematic diagram of the cross-sectional structure of the connecting ring (upper sleeve cross-sectional view, lower sleeve cross-sectional view) in the embodiment of the present application;

[0024] Fig. 9 This is a schematic cross-sectional structural diagram of a connecting sleeve in an embodiment of the present application;

[0025] Fig.10 It is a schematic diagram of the three-dimensional structure of the anti-jump component (bottom plate cross-section) in the embodiment of the present application.

[0026] In the figure: 1. supporting leg; 2. pedal; 3. power assembly; 4. table top; 5. machine head; 6. lighting desk lamp; 7. dust cover; 8. avoidance hole; 9. lever; 10. bottom plate; 11. connecting plate; 12. distance sensor; 13. mounting plate; 14. U-shaped groove; 15. connecting rod; 16. rotating column; 17. mounting sleeve; 18. movable rod; 19. reset spring; 20. guide strip; 21. connecting slider; 22. lower sleeve; 23. connecting ring; 24. upper sleeve; 25. first damping spring; 26. connecting sleeve; 27. buffer slider; 28. first buffer rod; 29. ​​second buffer rod; 30. second damping spring; 31. mounting groove; 32. light rod; 33. anti-jump slider; 34. third damping spring; 35. third buffer rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example: Reference Figure 1-10The reverse stitching mechanism of an industrial sewing machine shown in the figure includes a table top 4, two supporting legs 1 are fixedly connected to the lower side of the table top 4, and the opposite surfaces of the two supporting legs 1 are rotatably connected to a pedal 2, a power assembly 3 is fixedly connected to the lower side of the table top 4, and the power assembly 3 is rotatably connected to the pedal 2 through a connecting rod, a machine head 5 is fixedly connected to the upper side of the table top 4, a lighting desk lamp 6 is fixedly connected to the upper side of the table top 4, a base plate 10 is fixedly connected to the upper side of the machine head 5, a dust cover 7 is detachably connected to the upper side of the base plate 10, an avoidance hole 8 is opened on the upper side of the dust cover 7, a lever 9 is slidably connected to the inner wall of the avoidance hole 8, a connecting plate 11 is slidably connected to the inner wall of the dust cover 7, a switching assembly is fixedly connected to the upper side of the connecting plate 11, a buffer assembly is fixedly connected to the upper side of the base plate 10, a mounting groove 31 is opened on the upper side of the base plate 10, and an anti-jump assembly is fixedly connected inside the mounting groove 31.

[0029] Through the above structure, by setting the table top 4, support legs 1, pedals 2, power components 3 and machine heads 5, a simple representation of the currently commonly used industrial sewing machine is provided, which is only used for schematic illustration and will not be elaborated on here. By setting the bottom plate 10 as the installation platform, the dust cover 7 can protect the internal switching components, buffer components and anti-jump components to reduce the adverse effects brought about by the complex working environment of the industrial sewing machine. The switching component can help the user to quickly switch the reverse stitching mode, and has the characteristics of high sensing sensitivity, accurate positioning, simple overall structure, and convenient and quick installation. The buffer component and the anti-jumping component can absorb the vibration transmitted by the operation of the machine head 5, avoiding the distance sensor 12 from jumping under the action of vibration, ensuring that the distance sensor 12 is in a vibration environment for a long time will not cause the electronic components inside the distance sensor 12 to jump, ensuring the normal use of the distance sensor 12, and ensuring that the user can accurately switch the reverse stitching mode.

[0030] As a preferred implementation scheme in this embodiment, the switching component includes two guide bars 20 fixedly connected to the upper side of the connecting plate 11, the opposite surfaces of the two guide bars 20 are slidably connected with the same connecting slider 21, the lower side of the connecting slider 21 is slidably connected to the upper side of the connecting plate 11, the upper side of the connecting plate 11 is fixedly connected with a mounting plate 13, the upper side of the mounting plate 13 is provided with a U-shaped groove 14, and the upper side of the connecting plate 11 is fixedly connected with a distance sensor 12.

[0031] By setting two guide bars 20 to constrain the movement trajectory of the connecting slider 21, the U-shaped groove 14 on the mounting plate 13 can facilitate the lever 9 to stop at a fixed position. The distance sensor 12 will generate an electrical signal when the detected object moves. The emitted electrical signal is transmitted to the machine head 5. The machine head 5 will change the direction of the wiring after receiving the signal and start the reverse sewing movement.

[0032] In this embodiment, the switching assembly also includes a rotating column 16 rotatably connected to the upper side of the connecting plate 11, the surface of the rotating column 16 is fixedly connected to a mounting sleeve 17, the inner wall of the mounting sleeve 17 is slidably connected to a movable rod 18, the end of the movable rod 18 close to the rotating column 16 is fixedly connected to a reset spring 19, the end of the reset spring 19 away from the movable rod 18 is fixedly connected to the inner wall of the mounting sleeve 17, the upper side of the movable rod 18 is fixedly connected to the bottom end of the shift rod 9, the lower side of the movable rod 18 is fixedly connected to a connecting rod 15, the surface of the connecting plate 11 is slidably connected to the U-shaped groove 14, and the lower side of the mounting sleeve 17 is rotatably connected to the upper side of the connecting slider 21.

[0033] The reset spring 19 is provided to facilitate the movement of the movable rod 18 in the installation sleeve 17. When the connecting rod 15 moves inside the U-shaped groove 14, the reset spring 19 always has traction on the movable rod 18, ensuring that the connecting rod 15 will finally stop at both ends of the U-shaped groove 14 and will not move easily.

[0034] As a preferred implementation scheme in this embodiment, the buffer assembly includes a lower sleeve 22 fixedly connected to the upper side of the base plate 10, the surface of the lower sleeve 22 is slidably connected with a connecting ring 23, the lower side of the connecting plate 11 is fixedly connected with an upper sleeve 24, the surface of the upper sleeve 24 is slidably connected to the inner wall of the connecting ring 23, the inner bottom wall of the lower sleeve 22 is fixedly connected with a first damping spring 25, and the top end of the first damping spring 25 is fixedly connected to the inner top wall of the upper sleeve 24.

[0035] The first damping spring 25 is provided to absorb the vibration transmitted by the machine head 5. When the vibration is large and causes the internal parts to jump, the distance sensor 12 moves downward under the action of inertia, and the movement of the distance sensor 12 drives the connecting plate 11 to move downward. At this time, the first damping spring 25 is squeezed to limit the movement of the connecting plate 11, driving the connecting plate 11 to stop moving until it returns to its original position, thereby reducing the adverse effect of the vibration on the distance sensor 12.

[0036] In this embodiment, the left and right sides of the connecting ring 23 are fixedly connected with connecting sleeves 26, and the inner walls of the two connecting sleeves 26 are slidably connected with buffer sliders 27. The side of the buffer slider 27 close to the connecting ring 23 is fixedly connected with a second damping spring 30, and the end of the second damping spring 30 away from the buffer slider 27 is fixedly connected to the inner wall of the connecting sleeve 26.

[0037] By providing the connecting sleeve 26 as a mounting platform, the connecting sleeve 26 will limit the movement trajectory of the buffer slider 27 , and the second damping spring 30 will limit the movement speed of the buffer slider 27 .

[0038] In this embodiment, a movable hole is opened through the upper side of the connecting sleeve 26, and the upper side of the buffer slider 27 is rotatably connected to the first buffer rod 28, and the end of the first buffer rod 28 away from the buffer slider 27 is rotatably connected to the lower side of the connecting plate 11, and the lower side of the buffer slider 27 is rotatably connected to the second buffer rod 29, and the end of the second buffer rod 29 away from the buffer slider 27 is rotatably connected to the upper side of the base plate 10.

[0039] The movable hole is provided to facilitate the installation of the first buffer rod 28 and the second buffer rod 29. When the connecting plate 11 moves downward, the first buffer rod 28 and the second buffer rod 29 are retracted to each other, pushing the buffer slider 27 to squeeze the second damping spring 30. The second damping spring 30 is squeezed to generate elastic force, which hinders the movement of the buffer slider 27 until the buffer slider 27 returns to its original position. In essence, the second damping spring 30 is provided to convert the kinetic energy of the distance sensor 12 into the elastic potential energy of the two damping springs, thereby avoiding the distance sensor 12 from jumping due to vibration, ensuring that the distance sensor 12 is in a vibration environment for a long time without causing the electronic components inside the distance sensor 12 to jump, thereby ensuring the normal use of the distance sensor 12 and ensuring that the user can accurately switch to the reverse stitching mode.

[0040] As a preferred implementation scheme in this embodiment, the anti-jump assembly includes a light rod 32 fixedly connected to the inner wall of the mounting groove 31, and two anti-jump sliders 33 are slidably connected to the surface of the light rod 32. The opposite surfaces of the two anti-jump sliders 33 are fixedly connected to the same third damping spring 34. The upper sides of the two anti-jump sliders 33 are both rotatably connected to a third buffer rod 35, and one end of the third buffer rod 35 away from the anti-jump slider 33 is rotatably connected to the lower side of the connecting plate 11. There are two mounting grooves 31, and the two mounting grooves 31 are symmetrically arranged on the upper side of the base plate 10 with the horizontal midline of the upper side of the base plate 10 as the symmetry axis.

[0041] The installation groove 31 is provided to provide an installation space for the anti-jumping component. The surface of the light rod 32 is smooth, so that the two anti-jumping sliders 33 can move quickly along the surface of the light rod 32. When the external vibration is transmitted to the bottom plate 10, the distance sensor 12 moves downward under the action of inertia, and the movement of the distance sensor 12 drives the connecting plate 11 to move downward. The movement of the connecting plate 11 drives the third buffer rod 35 to move downward, and the movement of the third buffer rod 35 drives the two anti-jumping sliders 33 to move closer to each other. At this time, the third damping spring 34 is squeezed to generate elastic force, which hinders the movement trend of the two anti-jumping sliders 33 and drives the two anti-jumping sliders 33 to stop approaching until they return to their original positions. In essence, the third damping spring 34 is provided to convert the kinetic energy of the distance sensor 12 into the elastic potential energy of the two damping springs, thereby avoiding the distance sensor 12 from jumping under the action of vibration, ensuring that the distance sensor 12 is in a vibration environment for a long time without causing the electronic components inside the distance sensor 12 to jump, ensuring the normal use of the distance sensor 12, and ensuring that the user can accurately switch to the reverse stitching mode.

[0042] The working principle of the utility model is as follows: a reverse stitching mechanism of an industrial sewing machine. When the user needs to switch the reverse stitching mode, the lever 9 is toggled, and the movement of the lever 9 drives the movable rod 18 to move. The movement of the lever 9 drives the movable rod 18 to move. The movement of the movable rod 18 drives the connecting rod 15 and the installation sleeve 17 to move. The movement trajectory of the connecting rod 15 is limited by the reset spring 19 and the U-shaped groove 14, thereby limiting the stop position of the lever 9. The movement of the installation sleeve 17 drives the connecting slider 21 to move. The distance sensor 12 detects that the connecting slider 21 moves, and the emitted electrical signal is transmitted to the machine head 5. The machine head 5 receives the signal and changes the direction of the wiring, and starts the reverse stitching movement. The wiring mode is simple to switch, and has the characteristics of high sensing sensitivity, accurate positioning, simple overall structure, and convenient and quick installation. When the external vibration is transmitted to the bottom plate 10, the vibration is absorbed by the first damping spring 25. When the vibration is large and causes the internal parts to jump, the distance sensor 12 moves downward under the action of inertia, and the movement of the distance sensor 12 drives the connecting plate 11 to move downward. The movement of the plate 11 drives the third buffer rod 35 to move downward, and the movement of the third buffer rod 35 drives the two anti-jumping sliders 33 to approach each other. At this time, the third damping spring 34 is squeezed to generate elastic force, which hinders the movement trend of the two anti-jumping sliders 33 and drives the two anti-jumping sliders 33 to stop approaching until they return to their original positions. At the same time, when the connecting plate 11 moves downward, the first buffer rod 28 and the second buffer rod 29 retract against each other, pushing the buffer slider 27 to squeeze the second damping spring 30. The second damping spring 30 is squeezed to generate elastic force, which hinders the movement of the buffer slider 27 until the buffer slider 27 returns to its original position. In essence, by providing the second damping spring 30 and the third damping spring 34, the kinetic energy of the distance sensor 12 is converted into the elastic potential energy of the two damping springs, thereby avoiding the distance sensor 12 from jumping under the action of vibration, ensuring that the distance sensor 12 is in a vibration environment for a long time without causing the electronic components inside the distance sensor 12 to jump, ensuring the normal use of the distance sensor 12, and ensuring that the user can accurately switch to the reverse stitching mode.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reverse stitching mechanism for an industrial sewing machine, comprising a table top (4), characterized in that: The lower side of the table top (4) is fixedly connected to two supporting legs (1), and the opposite surfaces of the two supporting legs (1) are rotatably connected to pedals (2). The lower side of the table top (4) is fixedly connected to a power assembly (3), and the power assembly (3) is rotatably connected to the pedals (2) via a connecting rod. The upper side of the table top (4) is fixedly connected to a machine head (5), and the upper side of the table top (4) is fixedly connected to a lighting desk lamp (6). The upper side of the machine head (5) is fixedly connected to a bottom plate (10), and the bottom plate (10) A dust cover (7) is detachably connected to the upper side of the bottom plate (10), a avoidance hole (8) is provided on the upper side of the dust cover (7), a lever (9) is slidably connected to the inner wall of the avoidance hole (8), a connecting plate (11) is slidably connected to the inner wall of the dust cover (7), a switching assembly is fixedly connected to the upper side of the connecting plate (11), a buffer assembly is fixedly connected to the upper side of the bottom plate (10), a mounting groove (31) is provided on the upper side of the bottom plate (10), and an anti-jump assembly is fixedly connected inside the mounting groove (31).

2. The reverse stitching mechanism of an industrial sewing machine according to claim 1, characterized in that: The switching assembly comprises two guide bars (20) fixedly connected to the upper side of a connecting plate (11); the opposite surfaces of the two guide bars (20) are slidably connected to a same connecting slider (21); the lower side of the connecting slider (21) is slidably connected to the upper side of the connecting plate (11); the upper side of the connecting plate (11) is fixedly connected to a mounting plate (13); the upper side of the mounting plate (13) is provided with a U-shaped groove (14); and the upper side of the connecting plate (11) is fixedly connected to a distance sensor (12).

3. The reverse stitching mechanism of an industrial sewing machine according to claim 2, characterized in that: The switching assembly also includes a rotating column (16) rotatably connected to the upper side of the connecting plate (11); a mounting sleeve (17) is fixedly connected to the surface of the rotating column (16); a movable rod (18) is slidably connected to the inner wall of the mounting sleeve (17); an end of the movable rod (18) close to the rotating column (16) is fixedly connected to a return spring (19); an end of the return spring (19) away from the movable rod (18) is fixedly connected to the inner wall of the mounting sleeve (17); the upper side of the movable rod (18) is fixedly connected to the bottom end of the shifting rod (9); the lower side of the movable rod (18) is fixedly connected to the connecting rod (15); the surface of the connecting plate (11) is slidably connected to the U-shaped groove (14); and the lower side of the mounting sleeve (17) is rotatably connected to the upper side of the connecting slider (21).

4. The reverse stitching mechanism of an industrial sewing machine according to claim 1, characterized in that: The buffer assembly comprises a lower sleeve (22) fixedly connected to the upper side of the bottom plate (10), the surface of the lower sleeve (22) being slidably connected to a connecting ring (23), the lower side of the connecting plate (11) being fixedly connected to an upper sleeve (24), the surface of the upper sleeve (24) being slidably connected to the inner wall of the connecting ring (23), the inner bottom wall of the lower sleeve (22) being fixedly connected to a first damping spring (25), the top end of the first damping spring (25) being fixedly connected to the inner top wall of the upper sleeve (24).

5. The reverse stitching mechanism of an industrial sewing machine according to claim 4, characterized in that: The left and right sides of the connecting ring (23) are fixedly connected to connecting sleeves (26), the inner walls of the two connecting sleeves (26) are slidably connected to buffer sliders (27), a second damping spring (30) is fixedly connected to the side of the buffer slider (27) close to the connecting ring (23), and the end of the second damping spring (30) away from the buffer slider (27) is fixedly connected to the inner wall of the connecting sleeve (26).

6. The reverse stitching mechanism of an industrial sewing machine according to claim 5, characterized in that: A movable hole is formed through the upper side of the connecting sleeve (26); the upper side of the buffer slider (27) is rotatably connected to a first buffer rod (28); one end of the first buffer rod (28) away from the buffer slider (27) is rotatably connected to the lower side of the connecting plate (11); the lower side of the buffer slider (27) is rotatably connected to a second buffer rod (29); one end of the second buffer rod (29) away from the buffer slider (27) is rotatably connected to the upper side of the bottom plate (10).

7. The reverse stitching mechanism of an industrial sewing machine according to claim 1, characterized in that: The anti-jumping assembly comprises a light rod (32) fixedly connected to the inner wall of the mounting groove (31); two anti-jumping sliders (33) are slidably connected to the surface of the light rod (32); the opposite surfaces of the two anti-jumping sliders (33) are fixedly connected to the same third damping spring (34); the upper sides of the two anti-jumping sliders (33) are both rotatably connected to a third buffer rod (35); one end of the third buffer rod (35) away from the anti-jumping slider (33) is rotatably connected to the lower side of the connecting plate (11); the number of the mounting grooves (31) is two, and the two mounting grooves (31) are symmetrically arranged on the upper side of the base plate (10) with the horizontal midline of the upper side of the base plate (10) as the symmetry axis.

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