Laser slitting mechanism

Abstract

The utility model relates to the technical field of lithium battery coating, in particular to a laser slitting mechanism which comprises a first adjusting assembly and a second adjusting assembly. The second adjusting assembly is arranged at the adjusting end of the first adjusting assembly and is suitable for being driven by the first adjusting assembly to reciprocate in the first direction; the at least one laser assembly is arranged at the adjusting end of the second adjusting assembly and is suitable for being driven by the second adjusting assembly to reciprocate in the second direction so as to cut the to-be-cut piece; wherein the second direction is perpendicular to the first direction; the first position sensor is arranged at the adjusting end of the first adjusting assembly, is in communication connection with the first adjusting assembly and is suitable for detecting the moving position of the second adjusting assembly; and the second position sensor is arranged at the adjusting end of the second adjusting assembly, is in communication connection with the second adjusting assembly and is suitable for detecting the moving position of the laser assembly. The problems that an existing on-roller slitting mechanism is difficult to achieve accurate tool setting, a cutting ring needs to be replaced frequently due to abrasion in the production process, and the production efficiency is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery coating, in particular to a laser cutting mechanism. Background Art

[0002] During the rolling process of the film, it is necessary to perform a trimming process on the film according to actual needs. With the continuous development of new energy battery technology, the application of roller slitting mechanisms in the new energy industry is becoming more and more extensive. The existing roller slitting mechanism usually includes a slitting frame and a slitting knife. The slitting knife uses a ring knife set on the slitting frame to cut the pole pieces on the pressure roller. However, it is difficult to achieve precise knife alignment during the slitting process, and the ring knife needs to be frequently replaced due to wear during the production process, which affects production efficiency. Utility Model Content

[0003] The utility model provides a laser slitting mechanism, which solves the problem that the existing roller slitting mechanism is difficult to achieve accurate knife alignment, and the ring knife needs to be frequently replaced due to wear during the production process, which affects the production efficiency.

[0004] In view of this, the utility model provides a laser cutting mechanism, comprising:

[0005] a first regulating component;

[0006] A second adjusting component, disposed at an adjusting end of the first adjusting component, adapted to be driven by the first adjusting component to reciprocate along a first direction;

[0007] At least one set of laser components, arranged at the adjustment end of the second adjustment component, adapted to be driven by the second adjustment component to reciprocate along a second direction to cut the workpiece to be cut; wherein the second direction is perpendicular to the first direction;

[0008] a first position sensor, disposed at an adjustment end of the first adjustment component and in communication connection with the first adjustment component, and adapted to detect a moving position of the second adjustment component;

[0009] The second position sensor is arranged at the adjustment end of the second adjustment component and is communicatively connected with the second adjustment component, and is suitable for detecting the moving position of the laser component.

[0010] Optionally, the laser assembly includes a laser and a galvanometer, and the laser is arranged at the adjustment end of the second adjustment assembly; the laser is connected to the galvanometer via a connecting plate, and the output end of the laser corresponds to the input end of the galvanometer.

[0011] Optionally, the first adjustment component includes a first driving member, a first fixed seat and a first slider; at least one first guide rail is provided on the first fixed seat; the first slider is slidably connected to the first guide rail; the first driving member is connected to the first fixed seat, and the output end of the first driving member is connected to the first slider, suitable for driving the first slider to slide reciprocatingly on the first guide rail; wherein, the second adjustment component and the first position sensor are both arranged on the first slider; the first guide rail is arranged along the first direction.

[0012] Optionally, the first adjustment component also includes a first screw rod, which is rotatably arranged on the first fixed seat along the length direction of the first guide rail; the first driving member is a first servo motor, and the output end of the first servo motor is drivingly connected to the first screw rod, suitable for driving the first screw rod to rotate; the first screw rod is connected to the first slider through a first nut seat.

[0013] Optionally, the first servo motor is drivingly connected to the first screw via a first coupling.

[0014] Optionally, the first driving member is connected to the first fixing seat via a first mounting seat.

[0015] Optionally, the second adjustment component includes a second driving member, a second fixed seat and a second slider; at least one second guide rail is provided on the second fixed seat; the second slider is slidably connected to the second guide rail; the second driving member is connected to the second fixed seat, and the output end of the second driving member is connected to the second slider, suitable for driving the second slider to slide back and forth on the second guide rail; wherein the laser assembly and the second position sensor are both arranged on the second slider; the second guide rail is arranged along the second direction.

[0016] Optionally, the second adjustment component also includes a second screw rod, which is rotatably arranged on the second fixed seat along the length direction of the second guide rail; the second driving member is a second servo motor, and the output end of the second servo motor is drivingly connected to the second screw rod, suitable for driving the second screw rod to rotate; the second screw rod is connected to the second slider through a second nut seat.

[0017] Optionally, the second servo motor is drivingly connected to the second screw via a second coupling.

[0018] Optionally, the second driving member is connected to the second fixing seat via a second mounting seat.

[0019] The technical solution of this utility model has the following advantages:

[0020] In the utility model, when it is necessary to cut a workpiece to be cut by a laser assembly, the first adjusting assembly is fixed to an external device so that the output end of the laser assembly faces the workpiece to be cut, and then the position of the laser assembly can be adjusted in the first direction and the second direction according to the first position sensor and the position information fed back by the first position sensor by the first adjusting assembly and the second adjusting assembly, so as to accurately determine the position of the laser assembly, improve the accuracy of the adjustment, ensure the accuracy of the cutting position, and make the laser assembly start cutting the workpiece in the accurate position. At the same time, during the cutting process, the position of the laser assembly can also be adjusted in real time by the first adjusting assembly and the second adjusting assembly to improve the flexibility and accuracy of cutting. The number of components can be set to one, two, three or more groups to perform cutting at the same time to improve efficiency. The specific selection can be made according to actual conditions. The laser cutting mechanism provided by the utility model can be applied to the pole piece cutting process in the lithium battery manufacturing process. By using laser components to cut the pole pieces, compared with the ring knife cutting method, there is no need to align the knife, precise cutting can be achieved, and there is no need to frequently change the knife, thereby improving production efficiency. The laser component cuts the pole piece by focusing a high-energy laser beam. The cut after cutting is relatively flat, smooth and has clear edges, avoiding burrs and improving the production quality of the pole piece. At the same time, continuous cutting can be achieved with fast cutting speed and high efficiency. Precise positioning can avoid damage to the pressure roller and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of the laser cutting mechanism provided by the utility model at a first viewing angle;

[0023] Figure 2 This is a schematic diagram of the local structure of the laser cutting mechanism provided by the utility model at a second viewing angle.

[0024] Description of reference numerals:

[0025] 1. First position sensor; 2. Second position sensor; 3. Laser; 4. Vibrating mirror; 5. Connecting plate; 6. First driving member; 7. First fixed seat; 8. First slider; 9. First guide rail; 10. First screw rod; 11. First coupling; 12. First mounting seat; 13. Second driving member; 14. Second fixed seat; 15. Second slider; 16. Second guide rail; 17. Second screw rod; 18. Second mounting seat. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] See also Figure 1 and Figure 2The present embodiment provides a laser cutting mechanism, comprising: a first adjusting component; a second adjusting component, arranged at the adjusting end of the first adjusting component, suitable for being driven by the first adjusting component to reciprocate along the first direction; at least one group of laser components, arranged at the adjusting end of the second adjusting component, suitable for being driven by the second adjusting component to reciprocate along the second direction to cut the workpiece to be cut; wherein the second direction is perpendicular to the first direction; a first position sensor 1, arranged at the adjusting end of the first adjusting component, and connected in communication with the first adjusting component, suitable for detecting the moving position of the second adjusting component; a second position sensor 2, arranged at the adjusting end of the second adjusting component, and connected in communication with the second adjusting component, suitable for detecting the moving position of the laser component.

[0032] It should be noted that the output end of the laser component is facing the workpiece to be cut; communication connection refers to the communication between connected devices through signal transmission interaction, including wired connection (such as through wires, network cables, etc.) and wireless connection (such as WiFi, 4g connection, etc.).

[0033] In this embodiment, when it is necessary to cut the workpiece to be cut by the laser assembly, the first adjusting assembly is fixed to the external device so that the output end of the laser assembly is facing the workpiece to be cut, and then the position of the laser assembly can be adjusted in the first direction and the second direction according to the first position sensor 1 and the position information fed back by the first position sensor 1 through the first adjusting assembly and the second adjusting assembly, so as to accurately determine the position of the laser assembly, improve the accuracy of the adjustment, ensure the accuracy of the cutting position, and make the laser assembly start to cut the workpiece in the accurate position. At the same time, during the cutting process, the position of the laser assembly can also be adjusted in real time by the first adjusting assembly and the second adjusting assembly to improve the flexibility and accuracy of cutting. The number of optical components can be set to one, two, three or more groups to perform cutting at the same time to improve efficiency. The specific selection can be made according to actual conditions. The laser cutting mechanism provided in this embodiment can be applied to the pole piece cutting process in the lithium battery manufacturing process. By using laser components to cut the pole pieces, compared with the ring knife cutting method, there is no need to align the knife, precise cutting can be achieved, and there is no need to frequently change the knife, thereby improving production efficiency; the laser component cuts the pole piece by focusing a high-energy laser beam. The cut after cutting is relatively flat, smooth and has clear edges, avoiding burrs and improving the production quality of the pole piece. At the same time, continuous cutting can be achieved with fast cutting speed and high efficiency. Precise positioning can avoid damage to the pressure roller and increase the service life.

[0034] Example 2

[0035] As a further improvement to Example 1, Figure 1 and Figure 2As shown, the laser assembly includes a laser 3 and a galvanometer 4. The laser 3 is arranged at the adjustment end of the second adjustment assembly; the laser 3 is connected to the galvanometer 4 through a connecting plate 5, and the output end of the laser 3 corresponds to the input end of the galvanometer 4.

[0036] In this embodiment, the high-energy laser beam emitted by the laser 3 is focused onto the cut piece through the galvanometer 4. The galvanometer 4 stabilizes the laser beam and adjusts the output power, thereby improving the scope of application.

[0037] Specifically, the laser cutting mechanism further includes a controller, and the first adjustment component, the second adjustment component, the first position sensor 1, and the second position sensor 2 are all connected to the controller in communication. The controller controls, and according to the position information fed back by the first position sensor 1 and the second position sensor 2, the position of the laser component is confirmed, and then the position of the laser component is adjusted by the first adjustment component and the second adjustment component, so as to improve the degree of automation and accuracy.

[0038] Based on the above implementation, in a preferred implementation, Figure 1 and Figure 2 As shown, the first adjustment component includes a first driving member 6, a first fixed seat 7 and a first slider 8; at least one first guide rail 9 is provided on the first fixed seat 7; the first slider 8 is slidably connected to the first guide rail 9; the first driving member 6 is connected to the first fixed seat 7, and the output end of the first driving member 6 is connected to the first slider 8, which is suitable for driving the first slider 8 to slide reciprocatingly on the first guide rail 9; wherein the second adjustment component and the first position sensor 1 are both arranged on the first slider 8; the first guide rail 9 is arranged along the first direction.

[0039] It should be noted that when the number of the first guide rails 9 is greater than or equal to two, the plurality of first guide rails 9 are arranged in parallel and side by side; the first position sensor 1 is communicatively connected with the first driving member 6 .

[0040] In this embodiment, a first guide rail 9 is provided on the first fixed seat 7 to slide in cooperation with the first slider 8, so as to improve the stability of the first slider 8 when sliding. During adjustment, the first driving member 6 drives the first slider 8 to slide on the first guide rail 9, and at the same time, the adjustment is performed according to the information fed back by the first position sensor 1, thereby driving the laser assembly and the second adjustment assembly to move in the first direction. At the same time, the moving position of the first slider 8 is detected by the first position sensor 1, so as to cooperate with the second position sensor 2 to determine the position of the laser assembly.

[0041] Based on the above implementation, in a preferred implementation, Figure 1 and Figure 2As shown, the first adjustment component also includes a first screw rod 10, which is rotatably arranged on the first fixed seat 7 along the length direction of the first guide rail 9; the first driving member 6 is a first servo motor, and the output end of the first servo motor is drivingly connected to the first screw rod 10, suitable for driving the first screw rod 10 to rotate; the first screw rod 10 is connected to the first slider 8 through a first nut seat.

[0042] It should be noted that the first nut seat is threadedly sleeved on the first screw rod 10 .

[0043] In this embodiment, when the position of the laser assembly needs to be adjusted in the first direction, the first servo motor drives the first screw rod 10 to rotate, thereby driving the first nut seat to move on the first screw rod 10, and then driving the first slider 8 to slide on the first guide rail 9 to achieve adjustment of the laser assembly in the first direction.

[0044] Specifically, the number of the first guide rails 9 is two, and they are symmetrically arranged on both sides of the first screw rod 10, so as to improve the stability of the first adjustment component during the adjustment process.

[0045] As a convertible implementation method, this embodiment does not limit the specific structure of the first driving member 6. The first driving member 6 can be a cylinder, a hydraulic cylinder, a gear rack assembly or a linear motor driving assembly.

[0046] Based on the above implementation, in a preferred implementation, Figure 1 As shown, the first servo motor is drivingly connected to the first screw rod 10 via a first coupling 11 .

[0047] In this embodiment, the first servo motor is drivingly connected to the first screw rod 10 via the first coupling 11 , and the first coupling 11 has the functions of buffering, vibration reduction and overload protection during the process of transmitting torque.

[0048] Based on the above implementation, in a preferred implementation, Figure 1 and Figure 2 As shown, the first driving member 6 is connected to the first fixing seat 7 via the first mounting seat 12 .

[0049] In this embodiment, the first driving member 6 is installed via the first mounting seat 12 to improve the connection strength and stability, thereby increasing the service life.

[0050] Based on the above implementation, in a preferred implementation, Figure 1 and Figure 2As shown, the second adjustment component includes a second driving member 13, a second fixed seat 14 and a second slider 15; at least one second guide rail 16 is provided on the second fixed seat 14; the second slider 15 is slidably connected to the second guide rail 16; the second driving member 13 is connected to the second fixed seat 14, and the output end of the second driving member 13 is connected to the second slider 15, suitable for driving the second slider 15 to slide reciprocatingly on the second guide rail 16; wherein the laser assembly and the second position sensor 2 are both arranged on the second slider 15; the second guide rail 16 is arranged along the second direction.

[0051] It should be noted that when the number of the second guide rails 16 is greater than or equal to two, the plurality of second guide rails 16 are arranged in parallel and side by side; the second position sensor 2 is communicatively connected with the second driving member 13 .

[0052] In this embodiment, a second guide rail 16 is provided on the second fixed seat 14 to slide in cooperation with the second slider 15, thereby improving the stability of the second slider 15 when sliding. During adjustment, the second driving member 13 drives the second slider 15 to slide on the second guide rail 16, and at the same time, adjustment is performed according to the information fed back by the second position sensor 2, thereby driving the laser assembly and the second adjustment assembly to move in the second direction. At the same time, the moving position of the second slider 15 is detected by the second position sensor 2, so as to cooperate with the second position sensor 2 to determine the position of the laser assembly.

[0053] Specifically, the second fixing seat 14 is disposed on the first sliding block 8 .

[0054] Based on the above implementation, in a preferred implementation, Figure 1 As shown, the second adjustment component also includes a second screw rod 17, which is rotatably arranged on the second fixed seat 14 along the length direction of the second guide rail 16; the second driving member 13 is a second servo motor, and the output end of the second servo motor is drivingly connected to the second screw rod 17, suitable for driving the second screw rod 17 to rotate; the second screw rod 17 is connected to the second slider 15 through a second nut seat.

[0055] It should be noted that the second nut seat is threadedly sleeved on the second screw rod 17 .

[0056] In this embodiment, when the position of the laser assembly needs to be adjusted in the second direction, the second servo motor drives the second screw rod 17 to rotate, thereby driving the second nut seat to move on the second screw rod 17, and then driving the second slider 15 to slide on the second guide rail 16 to achieve adjustment of the laser assembly in the second direction.

[0057] Specifically, the number of the second guide rails 16 is two, and the two sides of the second screw rod 17 are symmetrically arranged to improve the stability of the second adjustment component during the adjustment process.

[0058] As a convertible implementation, this embodiment does not limit the specific structure of the second driving member 13. The second driving member 13 can be a cylinder, a hydraulic cylinder, a rack and pinion assembly, or a linear motor driving assembly.

[0059] On the basis of the above-mentioned embodiment, in a preferred embodiment, the second servo motor is drivingly connected to the second screw rod 17 via a second coupling.

[0060] In this embodiment, the second servo motor is drivingly connected to the second screw rod 17 via a second coupling, and the second coupling has the functions of buffering, vibration reduction and overload protection during the process of transmitting torque.

[0061] Based on the above implementation, in a preferred implementation, Figure 1 As shown, the second driving member 13 is connected to the second fixing seat 14 via the second mounting seat 18 .

[0062] In this embodiment, the second driving member 13 is installed via the second mounting seat 18 to improve the connection strength and stability, thereby increasing the service life.

[0063] The specific working principle of the laser cutting mechanism provided in this embodiment is as follows: when it is necessary to cut the workpiece to be cut by the laser assembly, it is fixed to the external device through the first fixing seat 7 so that the galvanometer 4 faces the workpiece to be cut, and then the position of the laser assembly is determined according to the first position sensor 1 and the position information fed back by the first position sensor 1, and then according to the position to be cut, the first slider 8 and the second slider 15 are adjusted to slide on the first guide rail 9 and the second guide rail 16 respectively through the first driving member 6 and the second driving member 13, and the position of the laser assembly can be adjusted in the first direction and the second direction. After the position is adjusted, the high-energy laser beam emitted by the laser 3 passes through the galvanometer 4 and is then focused on the workpiece with cutting, so as to accurately determine the position of the laser assembly, improve the accuracy of the adjustment, ensure the accuracy of the cutting position, so that the laser assembly is in the correct position to start cutting the workpiece to be cut, and at the same time during the cutting process , the position of the laser component can also be adjusted in real time by the first adjustment component and the second adjustment component to improve the flexibility and accuracy of cutting. The number of laser components can be set to one, two, three or more groups to cut at the same time and improve efficiency. The specific selection can be made according to the actual situation. The laser cutting mechanism provided in this embodiment can be applied to the pole piece cutting process in the lithium battery manufacturing process. By using the laser component to cut the pole piece, compared with the ring knife cutting method, there is no need to align the knife, and accurate cutting can be achieved, and there is no need to change the knife frequently, thereby improving production efficiency; the laser component cuts the pole piece by focusing the high-energy laser beam, and the cut after cutting is relatively flat, smooth and has clear edges, avoiding burrs, improving the production quality of the pole piece, and realizing continuous cutting at the same time. The cutting speed is fast and the efficiency is high. The pressure roller is avoided from being damaged by precise positioning, thereby improving the service life. It solves the problem that the existing roller slitting mechanism is difficult to achieve accurate knife alignment during the slitting process, and the ring knife needs to be frequently changed due to wear during the production process, which affects the production efficiency.

[0064] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A laser cutting mechanism, characterized in that: include: a first regulating component; A second adjusting component, disposed at an adjusting end of the first adjusting component, adapted to be driven by the first adjusting component to reciprocate along a first direction; At least one set of laser components, arranged at the adjustment end of the second adjustment component, adapted to be driven by the second adjustment component to reciprocate along a second direction to cut the workpiece to be cut; wherein the second direction is perpendicular to the first direction; A first position sensor (1), arranged at an adjustment end of the first adjustment component and in communication connection with the first adjustment component, and adapted to detect a moving position of the second adjustment component; The second position sensor (2) is arranged at the adjustment end of the second adjustment component and is in communication connection with the second adjustment component, and is suitable for detecting the moving position of the laser component.

2. The laser cutting mechanism according to claim 1, characterized in that: The laser assembly comprises a laser (3) and a galvanometer (4); the laser (3) is arranged at the adjustment end of the second adjustment assembly; the laser (3) is connected to the galvanometer (4) via a connecting plate (5); the output end of the laser (3) corresponds to the input end of the galvanometer (4).

3. The laser cutting mechanism according to claim 1, characterized in that: The first adjustment component comprises a first driving member (6), a first fixed seat (7) and a first slider (8); at least one first guide rail (9) is provided on the first fixed seat (7); the first slider (8) is slidably connected to the first guide rail (9); the first driving member (6) is connected to the first fixed seat (7), and the output end of the first driving member (6) is connected to the first slider (8), suitable for driving the first slider (8) to slide back and forth on the first guide rail (9); wherein the second adjustment component and the first position sensor (1) are both arranged on the first slider (8); the first guide rail (9) is arranged along a first direction.

4. The laser cutting mechanism according to claim 3, characterized in that: The first adjustment assembly further comprises a first screw rod (10), the first screw rod (10) being rotatably arranged on the first fixed seat (7) along the length direction of the first guide rail (9); the first driving member (6) being a first servo motor, the output end of the first servo motor being drivingly connected to the first screw rod (10), and being suitable for driving the first screw rod (10) to rotate; the first screw rod (10) being connected to the first slider (8) via a first nut seat.

5. The laser cutting mechanism according to claim 4, characterized in that: The first servo motor is drivingly connected to the first screw rod (10) via a first coupling (11).

6. The laser cutting mechanism according to claim 3, characterized in that: The first driving member (6) is connected to the first fixing seat (7) via a first mounting seat (12).

7. The laser cutting mechanism according to any one of claims 1 to 6, characterized in that: The second adjustment component comprises a second driving member (13), a second fixed seat (14) and a second slider (15); the second fixed seat (14) is provided with at least one second guide rail (16); the second slider (15) is slidably connected to the second guide rail (16); the second driving member (13) is connected to the second fixed seat (14), and the output end of the second driving member (13) is connected to the second slider (15), suitable for driving the second slider (15) to slide back and forth on the second guide rail (16); wherein the laser component and the second position sensor (2) are both arranged on the second slider (15); the second guide rail (16) is arranged along the second direction.

8. The laser cutting mechanism according to claim 7, characterized in that: The second adjustment assembly further comprises a second screw rod (17), the second screw rod (17) being rotatably arranged on the second fixed seat (14) along the length direction of the second guide rail (16); the second driving member (13) is a second servo motor, the output end of the second servo motor is drivingly connected to the second screw rod (17), and is suitable for driving the second screw rod (17) to rotate; the second screw rod (17) is connected to the second slider (15) via a second nut seat.

9. The laser cutting mechanism according to claim 8, characterized in that: The second servo motor is drivingly connected to the second screw rod (17) via a second coupling.

10. The laser cutting mechanism according to claim 7, characterized in that: The second driving member (13) is connected to the second fixing seat (14) via a second mounting seat (18).

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