Pay-off device

Abstract

The utility model relates to the technical field of pay-off equipment, and discloses a pay-off device. The pay-off device comprises a frame body mechanism; the driving mechanism is installed on the frame body mechanism, and the driving mechanism can support the spool and drive the spool to rotate around the axis of the spool; the floating mechanism comprises a first support and a floating wire wheel, the floating wire wheel is rotatably installed on the first support, the first support can slide relative to the frame body mechanism in the first direction, an included angle is formed between the first direction and the horizontal direction, and a wire on the wire shaft passes through the lower side of the floating wire wheel in a winding mode; and the position detection mechanism can detect the position of the floating wire wheel in the first direction, and the position detection mechanism is electrically connected with the driving mechanism. According to the pay-off device disclosed by the utility model, the tension can be kept in a proper range through the action of the floating wire wheel in a range with relatively small fluctuation of the used wire speed, the adjustment frequency of the pay-off speed is reduced, the fluctuation of the tension is reduced, and the winding quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wire pay-off equipment, in particular to a wire pay-off device. Background Art

[0002] During the winding process of a disc-type motor winding, the length and tension state of the wire from the wire spool to the winding device are very crucial, affecting the stability of the winding process and the quality of the winding. Generally, the length of the wire reserved between the wire spool and the winding device should be appropriate, neither too long nor too short. The tension during the wire conveying process should also be appropriate to avoid problems such as wire jumping, winding, wire stretching, or uneven winding during the winding process due to excessive or insufficient tension.

[0003] In the related art, to ensure that the tension of the wire is controlled within an appropriate range, it is usually achieved by correspondingly controlling the wire pay-off speed of the wire spool based on the wire usage rate of the downstream winding device. However, since the winding of the winding does not use the wire at a uniform speed, the above method requires frequent adjustment of the wire pay-off speed, making it difficult to achieve a high degree of matching between wire pay-off and wire usage, resulting in tension fluctuations and affecting the quality of the winding. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wire pay-off device that can ensure that the tension is maintained within an appropriate range through the movement of a floating wire wheel within a relatively small range of wire usage speed fluctuations, reduce the frequency of wire pay-off speed adjustment, reduce tension fluctuations, and improve the quality of the winding.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The wire pay-off device includes:

[0007] A frame mechanism;

[0008] A driving mechanism, installed on the frame mechanism, which can support the wire spool and drive the wire spool to rotate around its own axis;

[0009] A floating mechanism, the floating mechanism includes a first bracket and a floating wire wheel, the floating wire wheel is rotatably installed on the first bracket, the first bracket can slide relative to the frame mechanism in a first direction, the first direction is set at an angle to the horizontal direction, and the wire on the wire spool is wound around the lower side of the floating wire wheel;

[0010] A position detection mechanism, which can detect the position of the floating wire wheel in the first direction, and the position detection mechanism is electrically connected to the driving mechanism.

[0011] As an alternative solution, the position detection mechanism includes a first detection component and a second detection component. The first detection component and the second detection component are arranged on the frame mechanism at intervals along a first direction. The first detection component can identify the floating mechanism (30) and is electrically connected to the driving mechanism. The second detection component can identify the floating mechanism and is electrically connected to the driving mechanism.

[0012] As an alternative solution, the first direction is the vertical direction.

[0013] As an alternative solution, the wire pay-off device further includes a fixed wire wheel rotatably installed on the frame mechanism. The wire is wound around the floating wire wheel and then around the fixed wire wheel.

[0014] As an alternative solution, the fixed wire wheel is located directly above the floating wire wheel.

[0015] As an alternative solution, the winding diameter of the floating wire wheel is greater than or equal to the diameter of the wire-winding part of the wire spool; and / or

[0016] The winding diameter of the fixed wire wheel is greater than or equal to the diameter of the wire-winding part of the wire spool.

[0017] As an alternative solution, the driving mechanism includes:

[0018] A support component, including a driving roller and a driven roller arranged in parallel and at intervals. The driving roller and the driven roller are both rotatably installed on the frame mechanism. The wire spool can be supported between the driving roller and the driven roller;

[0019] A driving component, capable of driving the driving roller to rotate.

[0020] As an alternative solution, the driving mechanism further includes a transmission component. The transmission component includes a driving wheel, a driven wheel and a flexible member. The driving wheel is connected to the output end of the driving component. The driven wheel is connected to the driving roller. The flexible member is wound around the driving wheel and the driven wheel.

[0021] As an alternative solution, a linear guide rail is arranged on the frame mechanism. The linear guide rail extends along the first direction. A slider is connected to the first bracket. The slider is in sliding fit with the linear guide rail.

[0022] As an alternative solution, the wire pay-off device includes at least two driving mechanisms, a corresponding number of floating mechanisms, and a corresponding number of position detection mechanisms. The wire on the spool driven by each driving mechanism is wound around one of the floating mechanisms respectively. Each position detection mechanism detects the position of one of the floating mechanisms in the first direction and is electrically connected to the corresponding driving mechanism.

[0023] The beneficial effects of the present utility model are as follows:

[0024] For the wire pay-off device of the present utility model, the spool is supported on the driving mechanism. The wire on the spool is wound around the lower side of the floating pulley and finally reaches the external winding device. The wire supports the floating pulley, and the tension of the wire is balanced with the gravity of the floating pulley. During the process of using the wire at different speeds by the winding device, if the wire usage speed changes greatly or continuously, the floating pulley will move to the limit position in the first direction. At this time, the position detection mechanism sends a signal to the driving mechanism, and the driving mechanism adjusts the wire pay-off speed according to this signal to make the wire pay-off speed match the current wire usage speed, ensuring that the wire tension is maintained within an appropriate range. When the wire usage speed fluctuates within a small range, the floating pulley floats in the first direction to change the length of the wire between the spool and the winding device, so as to keep the wire under appropriate tension, thereby reducing the adjustment frequency of the wire pay-off speed of the driving mechanism, reducing the tension fluctuation, and improving the winding quality. Description of the Drawings

[0025] Figure 1 is a schematic structural view of the wire pay-off device provided by the specific embodiment of the present utility model;

[0026] Figure 2 is a side view of the wire pay-off device provided by the specific embodiment of the present utility model;

[0027] Figure 3 is an exploded view of the partial structure of the wire pay-off device provided by the specific embodiment of the present utility model.

[0028] In the figure:

[0029] 10, frame body mechanism; 11, first frame body; 111, base; 112, profile; 12, second frame body;

[0030] 20, driving mechanism; 21, support assembly; 211, driving roller; 212, driven roller; 213, limiting member; 22, driving assembly; 23, transmission assembly; 231, driving wheel; 232, driven wheel; 233, flexible member;

[0031] 30, floating mechanism; 31, first support; 32, floating pulley; 321, first winding groove; 33, sensing member;

[0032] 40. Position detection mechanism; 41. First detection component; 42. Second detection component;

[0033] 51. Second bracket; 52. Fixed wire pulley;

[0034] 60. Spool;

[0035] 71. Linear guide rail; 72. Slide block;

[0036] 80. Wire. Detailed implementation mode

[0037] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0040] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0041] This embodiment provides a wire winding device which can cooperate with a wire winding device to wind a wire 80 around an iron core to form a winding.

[0042] As Figure 1 shown, the wire pay-off device includes a frame mechanism 10, a driving mechanism 20, a floating mechanism 30, a position detection mechanism 40 and a controller (not shown in the figure). Among them, the driving mechanism 20 is installed on the frame mechanism 10. The driving mechanism 20 can support a bobbin 60 and drive the bobbin 60 to rotate around its own axis. The driving mechanism 20 is electrically connected to the controller, and the controller can adjust the rotation speed of the driving mechanism 20 for driving the bobbin 60. The floating mechanism 30 includes a first bracket 31 and a floating wire wheel 32. The floating wire wheel 32 is rotatably installed on the first bracket 31. The first bracket 31 can slide relative to the frame mechanism 10 in a first direction. The first direction is set at an angle to the horizontal direction. The wire 80 on the bobbin 60 is wound around the lower side of the floating wire wheel 32. The position detection mechanism 40 can detect the position of the floating wire wheel 32 in the first direction. The position detection mechanism 40 is electrically connected to the controller to achieve electrical connection with the driving mechanism 20.

[0043] The wire pay-off device of the present utility model, as Figure 1 and Figure 2 shown, the bobbin 60 is supported on the driving mechanism 20. The wire 80 on the bobbin 60 is wound around the lower side of the floating wire wheel 32 and finally reaches an external wire winding device. The wire 80 supports the floating wire wheel 32, and the tension of the wire 80 is balanced with the gravity of the floating wire wheel 32. During the process of the wire winding device using the wire 80 at different speeds, if the wire using speed changes greatly or continuously, the floating wire wheel 32 will move to the limit position in the first direction. At this time, the position detection mechanism 40 sends a signal to the driving mechanism 20, and the driving mechanism 20 adjusts the wire pay-off speed according to this signal to make the wire pay-off speed match the current wire using speed, ensuring that the tension of the wire 80 is maintained within an appropriate range. When the wire using speed fluctuates within a small range, the floating wire wheel 32 floats in the first direction to change the length of the wire 80 between the bobbin 60 and the wire winding device, so as to keep the wire 80 under appropriate tension, thereby reducing the adjustment frequency of the wire pay-off speed of the driving mechanism 20, reducing the tension fluctuation, and improving the winding quality.

[0044] In this embodiment, the first direction is the vertical direction, ensuring that the floating mechanism 30 floats up and down more smoothly. In other embodiments, the first direction can also be set at an acute angle to the horizontal direction. In this embodiment, the tension of the wire 80 and the friction force of the first frame 11 on the floating mechanism 30 jointly balance the gravity of the floating mechanism 30.

[0045] As Figure 1As shown, the frame mechanism 10 includes a first frame 11 and a second frame 12. Among them, the floating mechanism 30 is installed on the first frame 11, and the driving mechanism 20 is installed on the second frame 12. By adjusting the relative position between the first frame 11 and the second frame 12, the total reserved length of the wire 80 between the spool 60 and the winding device can be adjusted to ensure an appropriate reserved length and guarantee the winding quality.

[0046] In this embodiment, as Figure 2 and Figure 3 shown, the first frame 11 includes a profile 112 and a base 111. The base 111 is supported on the ground. The profile 112 is connected to the base 111 and extends in the vertical direction to facilitate supporting the floating mechanism 30 that can float in the vertical direction. Specifically, a linear guide 71 is provided on the frame mechanism 10. The linear guide 71 extends in the vertical direction. A slider 72 is connected to the first bracket 31. The slider 72 is slidably engaged with the linear guide 71, thereby ensuring that the floating mechanism 30 can smoothly move in the vertical direction under the action of the wire 80. In this embodiment, the linear guide 71 is correspondingly arranged with the groove on the profile 112 to facilitate ensuring the accuracy of the installation direction of the linear guide 71.

[0047] As Figure 1 and Figure 2 shown, the wire paying-off device further includes a fixed wire wheel 52 rotatably installed on the frame mechanism 10. The wire 80 is wound around the floating wire wheel 32 and then wound around the fixed wire wheel 52. By providing the fixed wire wheel 52, under the condition that the position of the floating wire wheel 32 is constantly changing, the output direction of the wire 80 can be ensured to be constant, and thus it is convenient to accurately dock with the downstream winding device or other structures. In this embodiment, the wire paying-off device further includes a second bracket 51. The fixed wire wheel 52 is rotatably installed on the second bracket 51. Optionally, the second bracket 51 is installed at the groove of the profile 112. With such an arrangement, not only is it convenient to ensure that the fixed wire wheel 52 and the floating wire wheel 32 are vertically aligned, but also it is convenient to flexibly adjust the installation position of the fixed wire wheel 52 in the vertical direction.

[0048] As Figure 2 shown, the fixed wire wheel 52 is located directly above the floating wire wheel 32. By arranging the fixed wire wheel 52 and the floating wire wheel 32 in the vertical direction, on the premise of ensuring that the wire 80 has a sufficient reserved length, the structure of the wire paying-off device is made more compact, thereby reducing the floor area of the wire paying-off device.

[0049] In this embodiment, the winding diameter of the floating wire wheel 32 is greater than or equal to the diameter of the wire-winding part of the wire spool 60, and the winding diameter of the fixed wire wheel 52 is greater than or equal to the diameter of the wire-winding part of the wire spool 60. Compared with the prior art in which a guide wheel with a smaller diameter is used to guide the wire 80, setting the diameters of the floating wire wheel 32 and the fixed wire wheel 52 within the above range can reduce the risks of the wire 80 being bent, stretched, and twisted, and ensure the smoothness of the subsequent winding.

[0050] As Figure 1 shown, the driving mechanism 20 includes a support assembly 21 and a driving assembly 22. Among them, the support assembly 21 includes a driving roller 211 and a driven roller 212. The driving roller 211 and the driven roller 212 are arranged in parallel at intervals and are respectively rotatably mounted on the frame mechanism 10. The wire spool 60 can be supported between the driving roller 211 and the driven roller 212, and the driving assembly 22 can drive the driving roller 211 to rotate. The driving roller 211 drives the wire spool 60 to rotate through friction, so as to realize wire pay-off. By supporting the wire spool 60 with the driving roller 211 and the driven roller 212, not only can it be ensured that the axis of the wire spool 60 accurately falls in the middle of the driving roller 211 and the driven roller 212, which is convenient for calculating the reserved length of the wire 80 subsequently; but also it can be applicable to supporting wire spools 60 of different sizes. Optionally, the driving assembly 22 can be a motor. The driving roller 211 and the driven roller 212 are both mounted on the first frame 11.

[0051] To ensure the axial position stability of the wire spool 60, as Figure 1 shown, the support assembly 21 further includes a limiting member 213. Limiting members 213 are arranged at both ends of the driving roller 211 and the driven roller 212. The two limiting members 213 on the same roller respectively abut against the end faces of both ends of the wire spool 60, so as to axially limit the wire spool 60. Optionally, the limiting member 213 is of a cylindrical structure and sleeved on the driving roller 211 or the driven roller 212.

[0052] To realize the driving of the driving roller 211 by the driving mechanism 20, as Figure 1As shown, the driving mechanism 20 further includes a transmission assembly 23. The transmission assembly 23 includes a driving wheel 231, a driven wheel 232, and a flexible member 233. The driving wheel 231 is connected to the output end of the driving assembly 22, the driven wheel 232 is connected to the driving roller 211, and the flexible member 233 is wound around the driving wheel 231 and the driven wheel 232. By providing the driving wheel 231, the driven wheel 232, and the flexible member 233, not only can the rotational motion output by the motor be transmitted to the driving roller 211, but also the installation position of the driving assembly 22 can be changed, enabling the motor to be arranged below the support assembly 21, thereby making the structure of the wire pay-off device more compact. Optionally, in some embodiments, both the driving wheel 231 and the driven wheel 232 are sprockets, and the flexible member 233 is a chain. In some embodiments, both the driving wheel 231 and the driven wheel 232 are belt pulleys, and the flexible member 233 is a belt.

[0053] As Figure 3 As shown, the position detection mechanism 40 includes a first detection component 41 and a second detection component 42. The first detection component 41 and the second detection component 42 are arranged on the frame mechanism 10 at intervals in the first direction. The first detection component 41 can identify the floating mechanism 30 and is electrically connected to the driving mechanism 20. The second detection component 42 can identify the floating mechanism 30 and is electrically connected to the driving mechanism 20. In this embodiment, the first detection component 41 is arranged above the second detection component 42, and the second detection component 42 and the second detection component 42 are respectively located at both ends of the floating range of the floating mechanism 30.

[0054] Specifically, when the wire usage speed of the winding device increases (or switches from the stopped winding state to the starting winding state), the length of the wire 80 between the spool 60 and the winding device becomes shorter. The wire 80 drives the floating mechanism 30 to move upward to the first detection component 41. After the first detection component 41 identifies the floating mechanism 30, it sends a signal to the driving mechanism 20. After obtaining this signal, the driving mechanism 20 increases the wire pay-off speed (or switches from stopped wire pay-off to starting wire pay-off); when the wire usage speed of the winding device decreases (or switches from the winding state to the stopped winding state), the length of the wire 80 between the spool 60 and the winding device increases. The floating mechanism 30 moves downward to the second detection component 42. After the second detection component 42 identifies the floating mechanism 30, it sends a signal to the driving mechanism 20. After obtaining this signal, the driving mechanism 20 decreases the wire pay-off speed (or stops wire pay-off), thereby ensuring that the wire pay-off speed matches the wire usage speed and the tension of the wire 80 is maintained within an appropriate range.

[0055] Optionally, in this embodiment, both the first detection component 41 and the second detection component 42 are proximity switches. Correspondingly, the floating mechanism 30 further includes an induction component 33, which is connected to the first frame 11. When the induction component 33 moves to the position of the first detection component 41 / the second detection component 42, it is recognized by the first detection component 41 / the second detection component 42. Optionally, the induction component 33 can be a metal sheet. In other embodiments, the first detection component 41 and the second detection component 42 can also be other types of sensors. In another embodiment, the position detection mechanism 40 can also be a position sensor, which can monitor the position of the floating mechanism 30 in real time and send a signal to the controller when the position of the floating mechanism 30 is about to reach the limit position, so as to control the driving mechanism 20 to adjust the wire release speed.

[0056] In some embodiments, such as Figure 3 shown, at least two turns of first winding grooves 321 are provided on the floating wire wheel 32, and at least two turns of second winding grooves are provided on the fixed wire wheel 52. The wire 80 on the wire shaft 60 is wound around the first first winding groove 321 on the floating wire wheel 32 and then wound around the first second winding groove on the fixed wire wheel 52, and then wound around the second first winding groove 321 on the floating wire wheel 32, and finally wound around the second second winding groove on the fixed wire wheel 52 and then extended to the downstream winding device. This setting can increase the reserved length of the wire 80 without increasing the floor area of the wire release device. It should be noted that if the wire 80 is a flat wire, the number of winding times of the wire 80 on the floating wire wheel 32 and the fixed wire wheel 52 is preferably once.

[0057] In some cases, the windings of the motor need to combine two wires 80 together and then wind them into windings. In this case, a combining device needs to be provided between the wire release device and the winding device, and the wires 80 on the two wire shafts 60 also need to be released.

[0058] In order to enable the wire release device to release the wires 80 on two wire shafts 60 simultaneously, the wire release device includes at least two driving mechanisms 20, corresponding numbers of floating mechanisms 30 and corresponding numbers of position detection mechanisms 40. The wire 80 on the wire shaft 60 driven by each driving mechanism 20 is wound around one floating mechanism 30 correspondingly, and each position detection mechanism 40 correspondingly detects the position of one floating mechanism 30 in the first direction and is electrically connected to the corresponding driving mechanism 20. This setting can not only realize the simultaneous wire release of two wire shafts 60, but also ensure that the tension of each wire 80 is maintained within an appropriate range during the wire release process. In this embodiment, the wires 80 wound around the two floating wire wheels 32 are both wound around the above-mentioned fixed wire wheel 52 and then extended to the downstream combining device, so as to ensure that the extension directions of the two wires 80 are the same when entering the combining device. In this embodiment, at least two second winding grooves need to be provided on the fixed wire wheel.

[0059] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation on the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Pay-off device, characterized in that, Comprising: Frame mechanism (10); Drive mechanism (20), mounted on the frame mechanism (10), the drive mechanism (20) being capable of supporting a spool (60) and driving the spool (60) to rotate about its own axis; Floating mechanism (30), the floating mechanism (30) including a first bracket (31) and a floating wire wheel (32), the floating wire wheel (32) being rotatably mounted on the first bracket (31), the first bracket (31) being capable of sliding relative to the frame mechanism (10) in a first direction, the first direction being set at an angle to the horizontal direction, and the wire on the spool (60) being wound around the lower side of the floating wire wheel (32); Position detection mechanism (40), capable of detecting the position of the floating wire wheel (32) in the first direction, the position detection mechanism (40) being electrically connected to the drive mechanism (20).

2. The wire pay-off device according to claim 1, wherein The position detection mechanism (40) includes a first detection component (41) and a second detection component (42), the first detection component (41) and the second detection component (42) being spaced apart in the first direction on the frame mechanism (10), the first detection component (41) being capable of identifying the floating mechanism (30) and being electrically connected to the drive mechanism (20), and the second detection component (42) being capable of identifying the floating mechanism (30) and being electrically connected to the drive mechanism (20).

3. The wire pay-off device according to claim 1, characterized in that The first direction is the vertical direction.

4. The pay-off device according to any one of claims 1 to 3, characterized in that: The wire pay-off device further includes a fixed wire wheel (52) rotatably mounted on the frame mechanism (10), and the wire is wound around the fixed wire wheel (52) after being wound around the floating wire wheel (32).

5. The pay-off device according to claim 4, characterized in that The fixed wire wheel (52) is located directly above the floating wire wheel (32).

6. The wire pay-off device according to claim 4, characterized in that, The winding diameter of the floating wire wheel (32) is greater than or equal to the diameter of the wire winding portion of the spool (60); and / or The winding diameter of the fixed wire wheel (52) is greater than or equal to the diameter of the wire winding portion of the spool (60).

7. The pay-off device according to any one of claims 1 to 3, characterized in that: The drive mechanism (20) includes: Support assembly (21), including a driving roller (211) and a driven roller (212) arranged in parallel and spaced apart, the driving roller (211) and the driven roller (212) being rotatably mounted on the frame mechanism (10), and the spool (60) being capable of being supported between the driving roller (211) and the driven roller (212); Drive assembly (22), capable of driving the driving roller (211) to rotate.

8. The wire pay-off device according to claim 7, characterized in that, The drive mechanism (20) further includes a transmission assembly (23), the transmission assembly (23) including a driving wheel (231), a driven wheel (232) and a flexible member (233), the driving wheel (231) being connected to the output end of the drive assembly (22), the driven wheel (232) being connected to the driving roller (211), and the flexible member (233) being wound around the driving wheel (231) and the driven wheel (232).

9. The wire pay-off device according to any one of claims 1 to 3, characterized in that, A linear guide rail (71) is provided on the frame mechanism (10). The linear guide rail (71) extends in a first direction. A slider (72) is connected to the first bracket (31), and the slider (72) is in sliding fit with the linear guide rail (71).

10. The wire pay-off device according to any one of claims 1 to 3, characterized in that The wire paying-off device includes at least two driving mechanisms (20), corresponding numbers of floating mechanisms (30), and corresponding numbers of position detection mechanisms (40). The wire on the spool (60) driven by each driving mechanism (20) is wound around one of the floating mechanisms (30). Each position detection mechanism (40) correspondingly detects the position of one floating mechanism (30) in the first direction and is electrically connected to the corresponding driving mechanism (20).

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