Roller shutter screen device

Abstract

The invention provides a roller shutter screen device. The roller shutter screen device comprises a reel, a first hanging rope and a roller shutter screen. The reel can rotate around the rotating shaft of the reel. And one end of the first hanging rope is connected with the reel. And one end of the roller shutter screen is connected with the other end of the first hanging rope. When the reel rotates in the first direction, the first hanging rope stretches relative to the reel so as to release the roller shutter screen. When the reel rotates in the second direction, the first hanging rope is wound relative to the reel so as to store the roller shutter screen, and the first direction is opposite to the second direction. The roller shutter screen device can meet the long-distance lifting requirement, and the visual display layout requirements of large-space places such as shopping malls, stations and exhibition halls are met.

Description

Roller screen device Technical Field

[0001] This invention belongs to the technical field of screen display devices, and more specifically, relates to a roller shutter screen device. Background Technology

[0002] In large public buildings such as shopping malls, train stations, and exhibition halls, the roller shutter LED display screens in this scenario need to meet the requirements of long-distance lifting and lowering. In some scenarios, the display screen also needs to be lowered to the ground to facilitate the installation, debugging, and daily maintenance of the screen.

[0003] The roller shutter LED display screen in the relevant technology can only realize the short-distance lifting and lowering of the display screen from the roller. Its actual descent distance is usually only about 1 meter away from the roller. It cannot adapt to the long-distance lifting and lowering needs of more than 10 meters in large clear height spaces, and it is difficult to meet the visual display layout requirements of large spaces such as shopping malls, stations, and exhibition halls. Summary of the Invention

[0004] The purpose of this invention is to provide a roller shutter screen device to solve the technical problem that existing roller shutter displays cannot adapt to long-distance lifting and lowering in spaces with large headroom.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a roller shutter screen device, comprising:

[0006] A reel, the reel being rotatable about its own axis of rotation;

[0007] A first lifting rope, one end of which is connected to the reel;

[0008] A roller blind screen, one end of which is connected to the other end of the first hanging rope;

[0009] When the roller rotates in a first direction, the first hanging rope extends relative to the roller to release the roller blind screen; when the roller rotates in a second direction, the first hanging rope winds around the roller to store the roller blind screen, the first direction and the second direction being opposite.

[0010] Furthermore, the surface of the reel is provided with a groove, and one end of the first hanging rope is connected to the groove wall. When the reel rotates along the first direction or the second direction, the first hanging rope stretches or wraps around the groove.

[0011] Furthermore, multiple grooves and multiple first hanging ropes are provided, with the multiple grooves spaced apart along the axial direction of the reel, and each of the multiple grooves corresponding to a multiple of the first hanging ropes.

[0012] Furthermore, the spacing between two adjacent grooves is equal.

[0013] Furthermore, the roller shutter screen device includes a support member and a bearing, the outer ring of the bearing being connected to the support member, and the inner ring of the bearing being connected to the roller.

[0014] Furthermore, the roller shutter screen device includes a first driving member, the driving shaft of the first driving member being connected to the roller, and the first driving member being used to drive the roller to rotate along its own rotation axis.

[0015] Furthermore, the roller shutter screen device includes a second hanging rope and a crossbeam, with one end of the second hanging rope connected to the crossbeam and the other end connected to the roller shutter screen.

[0016] Furthermore, multiple second hanging ropes are provided, and the multiple second hanging ropes are spaced apart along the length direction of the crossbeam.

[0017] Furthermore, the roller blind screen device includes a cable take-up device and a cable, the cable being electrically connected to the roller blind screen, the cable being wound around the roller, and the cable take-up device being used to store the cable.

[0018] Furthermore, the roller shutter screen device includes a first roller, a second roller, and a second driving member. The first roller and the second roller are rotatably mounted on the take-up device, and the second driving member is mounted on the take-up device. The drive shaft of the second driving member is connected to the first roller. A cable is provided between the first roller and the second roller, and the surfaces of the first roller and the second roller are in contact with the cable.

[0019] The second driving member can drive the first roller to rotate in the first direction, so that the first roller and the second roller can drive the cable to be released from the take-up device. The second driving member can also drive the first roller to rotate in the second direction, so that the first roller and the second roller can drive the cable to be taken in by the take-up device.

[0020] Compared with the prior art, the beneficial effects of the roller blind screen device provided by the present invention are as follows: The roller blind screen device of the present invention includes a roller, a first hanging rope, and a roller blind screen. The roller is rotatable about its own rotation axis. One end of the first hanging rope is connected to the roller. One end of the roller blind screen is connected to the other end of the first hanging rope. When the roller rotates in a first direction, the first hanging rope unwinds relative to the roller to release the roller blind screen; when the roller rotates in a second direction, the first hanging rope winds around the roller to retract the roller blind screen, the first direction and the second direction being opposite.

[0021] This application sets up a first hanging rope connected to a roller, and connects one end of the roller shutter screen to the end of the first hanging rope away from the roller. When the roller rotates in a first direction, it causes the first hanging rope to stretch relative to the roller, which can release the length of the first hanging rope to drive the roller shutter screen to descend a long distance away from the roller. Moreover, the length of the first hanging rope can be flexibly set according to the actual lifting and lowering requirements of a large space with a large headroom, which can adapt to the long-distance lifting and lowering requirements of more than 10 meters, and meet the visual display layout requirements of large spaces such as shopping malls, stations, and exhibition halls. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a structural schematic diagram of the roller shutter screen device provided in a preferred embodiment of the present invention.

[0024] Figure 2 is a front view of the roller shutter screen device provided in a preferred embodiment of the present invention.

[0025] Figure 3 is a front view of the roller shutter screen device provided in the preferred embodiment of the present invention in the retracted state.

[0026] Figure 4 is a structural schematic diagram of the take-up device provided in a preferred embodiment of the present invention.

[0027] The main markings in the attached figures are as follows:

[0028] 100. Scroll; 110. Groove;

[0029] 200. First hoisting rope;

[0030] 300. Roller blind screen;

[0031] 400. First driving component;

[0032] 500. Second hoisting rope;

[0033] 600, crossbeam;

[0034] 710. Take-up device; 720. Cable; 730. First roller; 740. Second roller; 750. Second drive unit. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0036] As shown in Figures 1 to 3, in some embodiments, the roller blind screen device includes a roller 100, a first hanging rope 200, and a roller blind screen 300. The roller 100 is rotatable about its own axis of rotation. One end of the first hanging rope 200 is connected to the roller 100. One end of the roller blind screen 300 is connected to the other end of the first hanging rope 200. When the roller 100 rotates in a first direction, the first hanging rope 200 unwinds relative to the roller 100 to release the roller blind screen 300. When the roller 100 rotates in a second direction, the first hanging rope 200 winds around the roller 100 to retract the roller blind screen 300; the first and second directions are opposite. The first direction can be clockwise, and the second direction can be counterclockwise. Alternatively, the first direction can be counterclockwise, and the second direction can be clockwise.

[0037] By setting a first hanging rope 200 connected to the roller 100, one end of the roller blind 300 is connected to the end of the first hanging rope 200 away from the roller 100. When the roller 100 rotates in the first direction, it drives the first hanging rope 200 to stretch relative to the roller 100. This releases the length of the first hanging rope 200 to drive the roller blind 300 to descend a long distance away from the roller 100. The length of the first hanging rope 200 can be flexibly set according to the actual lifting requirements of a large clear height space, which can adapt to long-distance lifting requirements of more than 10 meters and meet the visual display layout requirements of large spaces such as shopping malls, stations, and exhibition halls.

[0038] In some embodiments, the roller 100 is the core rotating support component of the roller blind screen device. The roller 100 can be a cylindrical structure capable of bidirectional rotation around its central axis. The roller 100 serves as the basic carrier for the winding and unwinding of the first hanging rope 200, and its installation position is adapted to the high-altitude fixed point requirements of large clear-height spaces such as shopping malls, stations, and exhibition halls. Specifically, the roller 100 can be a steel pipe or an aluminum pipe.

[0039] As shown in Figures 1 and 2, in some embodiments, the surface of the reel 100 is provided with a groove 110. One end of the first hanging rope 200 is connected to the groove wall of the groove 110. When the reel 100 rotates in a first direction or a second direction, the first hanging rope 200 stretches or wraps around the groove 110.

[0040] It should be noted that the groove 110 provides a connection and storage space for the first hanging rope 200. One end of the first hanging rope 200 is fixedly connected to the groove wall of the groove 110, so that the connecting end of the first hanging rope 200 is confined inside the groove 110 and cannot be arbitrarily shifted. When the roller 100 rotates in the first direction, the first hanging rope 200 connected to the groove wall of the groove 110 rotates with the roller 100, and completes an unfolding action relative to the groove 110, thereby releasing the first hanging rope 200 to drive the roller blind 300 to descend. When the roller 100 rotates in the second direction, the rotation of the roller 100 causes the first hanging rope 200 to gradually roll back and fit against the groove wall of the groove 110, and completes a winding action along the trajectory of the groove 110, so that the first hanging rope 200 is orderly stored in the groove 110, realizing the upward storage of the roller blind 300. The groove 110 provides a place and movement trajectory for the first hanging rope 200, so that the winding and stretching of the first hanging rope 200 are all along the groove wall of the groove 110. This effectively prevents the first hanging rope 200 from axially shifting and sliding during the rotation of the roller 100, or from irregularly winding or knotting with other parts of the roller 100 surface. This ensures the orderly operation of the first hanging rope 200 and provides a basis for the smooth lifting and lowering of the roller screen 300.

[0041] In some embodiments, multiple grooves 110 and multiple first hanging ropes 200 are provided. The multiple grooves 110 are spaced apart along the axial direction of the roll 100, and the multiple grooves 110 correspond one-to-one with the multiple first hanging ropes 200.

[0042] It should be noted that multiple first hanging ropes 200 are arranged at intervals along the axial direction of the roller spool 100 and connected together to the roller blind 300. This evenly distributes the weight of the roller blind 300 and the tensile load during the lifting process to multiple axial points of the roller spool 100, significantly improving the overall load-bearing limit of the device and adapting to the long-distance lifting requirements of large-size and heavy roller blinds 300. In addition, this structure can ensure the synchronous lifting of the roller blind 300, prevent the roller blind 300 from tilting and getting stuck, and ensure that the extension and winding trajectory of each first hanging rope 200 is limited by the groove 110. Moreover, when the roller spool 100 rotates, the length and speed of each first hanging rope 200 are completely synchronized, avoiding uneven local force and tilting problems of the roller blind 300 caused by asynchronous lifting of the hanging ropes. This ensures that the roller blind 300 always remains vertical during long-distance lifting and lowering, preventing the roller blind 300 from scraping or getting stuck with the surrounding structure due to tilting.

[0043] Specifically, the number of grooves 110 and the first hanging rope 200 can be three.

[0044] Specifically, the spacing between two adjacent grooves 110 is equal. This arrangement ensures that the tension of the multiple first hanging ropes 200 is evenly applied to equidistant points along the axial direction of the reel 100. This ensures that the stress distribution at all axial positions is completely consistent during the rotation and load-bearing process of the reel 100, completely eliminating the problem of excessive local stress caused by uneven spacing of the grooves 110. It also prevents structural damage such as bending, deformation, and cracking of the reel 100 due to unbalanced stress distribution, thus ensuring the structural stability and smooth rotation of the reel 100.

[0045] As shown in Figure 1, in some embodiments, the roller shutter screen device includes a first drive member 400. The drive shaft of the first drive member 400 is connected to the roller 100. The first drive member 400 is used to drive the roller 100 to rotate along its own rotation axis.

[0046] The first drive unit 400 provides a power source for the rotation of the roller 100. The drive shaft of the first drive unit 400 is coaxially and fixedly connected to the roller 100, so that the rotational power of the drive shaft can be directly transmitted to the roller 100. The first drive unit 400 can output rotational power in a first direction or a second direction according to control commands, driving the drive shaft to rotate in the corresponding direction, thereby driving the roller 100 to rotate synchronously around its own rotation axis in the same direction, realizing precise control of the rotation direction and speed of the roller 100. When the first drive unit 400 drives the roller 100 to rotate in the first direction, the roller 100 drives the first hanging rope 200 to stretch relative to the groove 110 to release the roller blind 300; when the first drive unit 400 drives the roller 100 to rotate in the second direction, the roller 100 drives the first hanging rope 200 to wind relative to the groove 110 to store the roller blind 300. The first driving component 400 provides a continuous and stable driving force for the rotation of the roller 100, replacing non-automatic methods such as manual driving, and realizing the electric and automated control of the lifting and lowering action of the roller screen 300. The lowering release and raising storage of the roller screen 300 can be completed without manual intervention.

[0047] Specifically, the first driving component 400 can be a motor.

[0048] In some embodiments, the roller shutter screen device includes a support member and a bearing. The outer ring of the bearing is connected to the support member, and the inner ring of the bearing is connected to the roller 100.

[0049] The support component provides a basic load-bearing structure for the fixed installation of the bearing and the reel 100, serving as the load-bearing foundation for the entire device and providing a stable mounting point and load-bearing surface for the bearing. The bearing adopts a structural design with an inner and outer ring that rotate relative to each other. The outer ring is fixedly connected to the support component, forming an integrated static structure, while the inner ring is fixedly connected to the reel 100, forming an integrated rotating structure. The inner ring of the bearing can perform low-friction circumferential rotation relative to the outer ring, thereby driving the reel 100 connected to the inner ring to achieve flexible and smooth rotational movement relative to the support component connected to the outer ring, with the bearing's rotation center as the axis. At the same time, the structural constraints of the bearing limit the position of the rotation axis of the reel 100, ensuring the coaxiality of the reel 100's rotation.

[0050] Specifically, two support members can be provided. The two support members are respectively provided at both ends of the reel 100. The two support members serve as the fixed load-bearing foundation of the device, and are firmly set at both ends of the axial direction of the reel 100, providing independent and symmetrical mounting support points for the bearings.

[0051] Specifically, two bearings can be installed. The two bearings are correspondingly installed with two support components.

[0052] Specifically, the support member can be a support sidewall.

[0053] In some embodiments, the first hanging rope 200 is a flexible load-bearing connector with high load-bearing and tensile strength. One end of the rope is fixedly connected to the outer peripheral wall of the roller 100, and the connection points are evenly arranged along the axial direction of the roller 100 to ensure force balance. The first hanging rope 200 can be wound or unwound as the roller 100 rotates.

[0054] Specifically, the first hoisting rope 200 can be a steel wire rope.

[0055] In some embodiments, the roller blind 300 is a flexible display component, serving as the main functional unit of the roller blind screen device. The top edge of the roller blind 300 is fixedly connected to the other end of the first hanging rope 200 away from the roller shaft 100. The overall position of the roller blind 300 is determined by the extended or wound state of the first hanging rope 200, naturally hanging below it. The roller blind 300 and the roller shaft 100 have a vertically corresponding spatial relationship.

[0056] Specifically, the roller shutter screen 300 can be an LED screen.

[0057] As shown in Figures 1 and 2, in some embodiments, the roller shutter screen device includes a second hanging rope 500 and a crossbeam 600. One end of the second hanging rope 500 is connected to the crossbeam 600, and the other end is connected to the roller shutter screen 300.

[0058] It should be noted that the crossbeam 600 is a rigid load-bearing connector. The crossbeam 600 serves as a force transfer and connection carrier between the first hanging rope 200 and the second hanging rope 500, receiving the lifting and lowering traction force transmitted by the first hanging rope 200 and evenly distributing it to each of the second hanging ropes 500. One end of each of the multiple second hanging ropes 500 is fixedly connected to the crossbeam 600, and the other end is fixedly connected to the top of the roller shutter screen 300, allowing the roller shutter screen 300 to be suspended below the crossbeam 600 via the second hanging ropes 500. When the first hanging rope 200 expands or winds around the roller spool 100, it drives the crossbeam 600 to perform a synchronized vertical lifting and lowering movement. The lifting and lowering of the crossbeam 600 synchronously transmits traction force to the roller shutter screen 300 through each of the second hanging ropes 500, thereby causing the roller shutter screen 300 to complete the lowering or raising motion together with the crossbeam 600.

[0059] Specifically, the second suspension rope 500 can be a steel wire rope.

[0060] Specifically, multiple second hanging ropes 500 are provided, and the multiple second hanging ropes 500 are spaced apart along the length direction of the crossbeam 600.

[0061] Specifically, the crossbeam 600 is arranged parallel to the roller 100. With this arrangement, when the crossbeam 600 moves vertically up and down with the first hanging rope 200, its overall posture always remains parallel to the roller 100, and the lifting trajectory and lifting height at both ends of the crossbeam 600 remain synchronized. This avoids the problem of the roller shutter screen 300 tilting or tipping over due to uneven force, prevents the screen from scraping or getting stuck with the surrounding structure, and ensures the smoothness of the roller shutter screen 300's long-distance lifting and lowering.

[0062] As shown in Figures 1 and 2, in some embodiments, the roller shutter screen device includes a cable retractor 710 and a cable 720. The cable 720 is electrically connected to the roller shutter screen 300 and is wound around the roller 100. The cable retractor 710 is used to store the cable 720.

[0063] It should be noted that cable 720 serves as the power supply and signal transmission carrier for the roller shutter screen 300. It maintains a stable electrical connection with the roller shutter screen 300, providing power support and a signal transmission channel for the normal display and control of the roller shutter screen 300. Cable 720 is wound around the roller spool 100 according to the lifting and lowering requirements of the roller shutter screen 300, adapting to the rotational movement of the roller spool 100. Cable retractor 710 is a dedicated storage component for cable 720, forming a coordinated cable 720 winding and unwinding system with the roller spool 100. When the roller 100 rotates in the first direction, causing the roller shutter screen 300 to descend, the cable 720 wound around the roller 100 gradually extends and releases as the roller shutter screen 300 moves downward. The cable retractor 710 works in sync to unwind the cable 720, ensuring that the released length of the cable 720 matches the descending height of the roller shutter screen 300. When the roller 100 rotates in the second direction, causing the roller shutter screen 300 to rise and be stored, the cable retractor 710 initiates the storage action, orderly retracting and storing the extended cable 720. At the same time, the cable 720 is rewound around the roller 100 as the roller 100 rotates. Through the coordinated action of the cable retractor 710 and the roller 100, the unwinding and rewinding of the cable 720 is always consistent with the rising and falling rhythm of the roller shutter screen 300.

[0064] As shown in Figure 4, the roller shutter screen device includes a first roller 730, a second roller 740, and a second drive member 750. The first roller 730 and the second roller 740 are rotatably mounted on a cable take-up unit 710, and the second drive member 750 is mounted on the cable take-up unit 710. The drive shaft of the second drive member 750 is connected to the first roller 730. A cable 720 is provided between the first roller 730 and the second roller 740, and the surfaces of both the first roller 730 and the second roller 740 are in contact with the cable 720. Specifically, the first roller 730 and the second roller 740 can be rubber rollers.

[0065] The second drive member 750 can drive the first roller 730 to rotate in the first direction, so that the first roller 730 and the second roller 740 drive the cable 720 to be released from the take-up device 710. The second drive member 750 can drive the first roller 730 to rotate in the second direction, so that the first roller 730 and the second roller 740 drive the cable 720 to be taken into the take-up device 710.

[0066] During the screen's ascent, the first drive unit 400 drives the reel 100 to rotate in the second direction, causing the first hanging rope 200 to wind into the groove 110 of the reel 100. At this time, the second drive unit 750 drives the first roller 730 to rotate in the second direction, and the take-up coil 710 takes in the cable 720. The first drive unit 400 continues to drive the reel 100 to rotate, sequentially winding the crossbeam 600 and the roller shutter screen 300 onto the reel 100. One end of the cable 720 is fixed to the crossbeam 600, and the cable 720 is also wound onto the reel 100. At this point, the second drive unit 750 rotates in the opposite direction, i.e., in the first direction, releasing the cable 720 from the take-up coil 710, so that the cable 720 released from the take-up coil 710 winds onto the reel 100.

[0067] During the screen descent, the first drive unit 400 drives the roller 100 to rotate in a first direction, thereby releasing the first hanging rope 200 from the groove 110 of the roller 100. At this time, the second drive unit 750 drives the first roller 730 to rotate in the first direction, thereby releasing the cable 720 from the take-up device 710. The first drive unit 400 continues to drive the roller 100 to rotate, thereby unfolding the roller screen 300 and causing it to descend.

[0068] The first drive unit 400 and the second drive unit 750 can coordinate and control their speeds through software programs to ensure that the cable 720 will not be pulled by force during the winding process, thus preventing malfunctions.

[0069] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless a specific order is expressly specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0070] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roller shutter screen device, characterized in that, include: A reel, the reel being rotatable about its own axis of rotation; A first hanging rope, one end of which is connected to the roller; a roller blind, one end of which is connected to the other end of the first hanging rope; when the roller rotates in a first direction, the first hanging rope extends relative to the roller to release the roller blind; when the roller rotates in a second direction, the first hanging rope winds around the roller to store the roller blind, wherein the first direction and the second direction are opposite.

2. The roller shutter screen device as described in claim 1, characterized in that, The surface of the reel is provided with a groove, and one end of the first hanging rope is connected to the groove wall. When the reel rotates along the first direction or the second direction, the first hanging rope stretches or wraps around the groove.

3. The roller shutter screen device as described in claim 2, characterized in that, Both the groove and the first hanging rope are provided in multiple ways. The multiple grooves are spaced apart along the axial direction of the reel, and each of the multiple grooves corresponds to one of the multiple first hanging ropes.

4. The roller shutter screen device as described in claim 3, characterized in that, The spacing between two adjacent grooves is equal.

5. The roller shutter screen device as claimed in claim 1, characterized in that, The roller shutter screen device includes a support member and a bearing. The outer ring of the bearing is connected to the support member, and the inner ring of the bearing is connected to the roller.

6. The roller shutter screen device as claimed in claim 1, characterized in that, The roller shutter screen device includes a first driving member, the driving shaft of the first driving member being connected to the roller, and the first driving member being used to drive the roller to rotate along its own rotation axis.

7. The roller shutter screen device as claimed in claim 1, characterized in that, The roller shutter screen device includes a second hanging rope and a crossbeam, with one end of the second hanging rope connected to the crossbeam and the other end connected to the roller shutter screen.

8. The roller shutter screen device as claimed in claim 7, characterized in that, Multiple second hanging ropes are provided, and the multiple second hanging ropes are spaced apart along the length direction of the crossbeam.

9. The roller shutter screen device as claimed in claim 1, characterized in that, The roller shutter screen device includes a cable take-up device and a cable. The cable is electrically connected to the roller shutter screen and is wound around the roller. The cable take-up device is used to store the cable.

10. The roller shutter screen device as claimed in claim 9, characterized in that, The roller shutter screen device includes a first roller, a second roller, and a second driving member. The first roller and the second roller are rotatably mounted on the cable take-up device, and the second driving member is mounted on the cable take-up device. The drive shaft of the second driving member is connected to the first roller. A cable is disposed between the first roller and the second roller, and the surfaces of the first roller and the second roller are in contact with the cable. The second driving member can drive the first roller to rotate in a first direction, so that the first roller and the second roller pull the cable out of the cable take-up device. The second driving member can also drive the first roller to rotate in a second direction, so that the first roller and the second roller pull the cable back into the cable take-up device.

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