Waste silk recovery device and waste silk recovery system

Abstract

The utility model provides a waste wire recovery device and a waste wire recovery system, and relates to the technical field of metal wire manufacturing. The waste silk recycling device comprises a driving assembly and a winding assembly, the winding assembly comprises a winding piece and a limiting piece, the winding piece is detachably connected with the limiting piece, the winding piece is used for winding waste silk, one of the winding piece and the limiting piece is connected with the driving assembly, and the other one of the winding piece and the limiting piece is connected with the driving assembly. And the driving assembly can drive one of the winding piece and the limiting piece to rotate. According to the waste wire recycling device, waste wires are recycled through cooperation of the driving assembly and the winding assembly, manual winding is not needed, the wire unwinding time is shortened, the labor cost is reduced, and the waste wire recycling efficiency is improved. Meanwhile, the waste wires can be stripped from the wire winding piece by separating the wire winding piece from the limiting piece, a cutter does not need to be used for cutting, the wire winding assembly is prevented from being scratched, the wire winding assembly can be repeatedly used, and therefore the waste wire recycling cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire manufacturing, in particular to a waste wire recycling device and a waste wire recycling system. BACKGROUND

[0002] In the drawing process of metal wire, some defects will inevitably occur, which will cause the drawn wire to not meet the requirements, such as the surface of the metal wire being not smooth or the performance not meeting the requirements. Therefore, recycling the waste wire that does not meet the requirements and then re-melting and casting is an important process in the manufacturing process of metal wire.

[0003] At present, in the production process of metal wire, a cylindrical spool is used for winding. When it is detected that the metal wire on a spool is unqualified, an operator needs to rewind the wire from the spool. There are two ways to rewind the wire. The first way is to manually directly wind the wire, which needs to consume a lot of time and labor cost, and the efficiency is also very low. The second way is to use a cutter to directly cut the wire to rewind the wire, which will cause the spool to be scratched and cannot be used again, thereby increasing the production cost. Therefore, the above two ways of rewinding the wire cannot meet the requirements of waste wire recycling. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a waste wire recycling device and a waste wire recycling system to solve the problem that the existing rewinding method cannot meet the requirements of waste wire recycling.

[0005] According to an aspect of the present application, a waste wire recycling device is provided, which comprises a driving assembly and a winding assembly. The winding assembly comprises a winding piece and a limiting piece. The winding piece is detachably connected with the limiting piece. The winding piece is used for winding waste wire. One of the winding piece and the limiting piece is connected with the driving assembly, so that the driving assembly can drive one of the winding piece and the limiting piece to rotate.

[0006] Preferably, the winding piece comprises an abutting portion and a winding portion. The winding portion is connected with the abutting portion and the limiting piece at two ends thereof in the axial direction of the winding assembly. Part of the limiting piece protrudes in the radial direction of the winding assembly relative to the winding portion. Part of the abutting portion protrudes in the radial direction relative to the winding portion.

[0007] Preferably, in the direction in which the abutting portion points to the limiting piece, the diameter of the winding portion gradually decreases.

[0008] A first isosceles trapezoidal cross section is obtained by cutting the winding portion in a plane passing through the axis of the winding piece. The bottom angle of the first isosceles trapezoidal cross section is greater than or equal to 45 degrees and less than 90 degrees.

[0009] Preferably, the waste silk recycling device further comprises a fastener, the limiting member comprises a limiting portion, the limiting portion is provided with a first connecting hole, the winding portion is provided with a second connecting hole, and the fastener can pass through the first connecting hole and the second connecting hole.

[0010] Preferably, the limiting member further comprises a connecting portion, the connecting portion is connected with the winding portion, the driving assembly comprises a driving member and a rotating shaft, the driving member is connected with the rotating shaft so that the driving member can drive the rotating shaft to rotate, and the rotating shaft is connected with the connecting portion.

[0011] Preferably, the winding portion is provided with a first mounting hole, the connecting portion can extend into the first mounting hole and abut against a hole wall of the first mounting hole.

[0012] Preferably, the connecting portion is provided with a first through hole extending along the axial direction;

[0013] The abutting portion is provided with a second mounting hole, the first through hole, the first mounting hole and the second mounting hole are in communication, the rotating shaft passes through the first mounting hole, the second mounting hole and the first through hole and is threadedly connected with the connecting portion.

[0014] Preferably, in the direction in which the limiting portion points to the abutting portion, the diameter of the connecting portion is tapered;

[0015] A second isosceles trapezoid cross section is obtained by cutting the connecting portion in a plane passing through the axis of the limiting member, the bottom angle of the second isosceles trapezoid cross section is greater than or equal to 45 degrees and less than 90 degrees.

[0016] According to another aspect of the present application, a waste silk recycling system is provided, the waste silk recycling system comprises a supporting device and the above-described waste silk recycling device, the supporting device is used for supporting a spool, and the spool is wound with the waste silk.

[0017] Preferably, the supporting device comprises a supporting member and a fixing member, the supporting member is fixed on the fixing member, the supporting member can pass through the spool so that the spool can rotate relative to the supporting member.

[0018] In the metal wire production process, the metal wire is wound on the spool, and when the metal wire on the spool is detected to be unqualified, the waste wire recovery device of the application is used for waste wire recovery. When the waste wire recovery device of the application is used for waste wire recovery, the winding part and the limiting part need to be installed first, and the end of the waste wire on the spool is bonded to the winding part, and then one of the winding part and the limiting part is driven to rotate by the driving assembly, so that the waste wire is wound on the winding part. During the waste wire winding process, the limiting part can block the waste wire to prevent the waste wire from falling off the winding part; after the waste wire winding is completed, the winding part and the limiting part are disassembled, so that the winding part and the limiting part are separated, at this time, the limiting part no longer blocks the waste wire, and the waste wire can be peeled off from the winding part. In this way, the waste wire recovery device of the application realizes the recovery of the waste wire through the cooperation of the driving assembly and the winding assembly, without manual winding and rewinding, reducing the rewinding time and labor cost, and improving the efficiency of waste wire recovery. At the same time, the winding part and the limiting part are separated, and the waste wire can be peeled off from the winding part without using a knife, avoiding scratching the winding assembly, and the winding assembly can be reused, thereby reducing the cost of waste wire recovery. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 The structure of the waste wire recovery device is shown;

[0021] Figure 2 The structure of the winding part is shown;

[0022] Figure 3 The structure of the limiting part is shown;

[0023] Figure 4 The structure of the driving assembly is shown;

[0024] Figure 5 The relative position diagram of the rotating shaft and the winding assembly is shown;

[0025] Figure 6 The structure of the waste wire recovery system is shown;

[0026] Figure 7 The relative position diagram of the supporting device and the spool is shown.

[0027] Icon: 100 - waste silk recycling device; 110 - driving assembly; 111 - housing; 112 - rotating shaft; 120 - winding assembly; 121 - winding piece; 1211 - abutting part; 1212 - winding part; 1213 - first mounting hole; 1214 - second mounting hole; 122 - limiting piece; 1221 - connecting part; 1222 - limiting part; 1223 - first connecting hole; 200 - supporting device; 210 - supporting piece; 220 - fixing piece; 300 - spool; 400 - waste silk. DETAILED DESCRIPTION

[0028] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0029] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatuses, and / or systems to those skilled in the art. Further, the description should not be interpreted as implying that any particular element, feature, structure, or characteristic is essential.

[0030] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on", "connected to", "coupled to", "bonds to", "on top of", or "covering" another element, it can be directly on, connected to, coupled to, bonds to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly bonds to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0031] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0032] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being called a first element, component, region, layer or section can also be called a second element, component, region, layer or section, without departing from the example teachings.

[0033] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0034] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms, i.e., to mean "including, but not limited to", "including, but not limited to", "including, but not limited to" and "including, but not limited to", respectively.

[0035] Variations in the shapes of the elements shown in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes of the elements shown in the drawings, but include variations in shapes that would occur as a result of manufacturing processes.

[0036] Features of the examples described herein can be combined with one another in various ways. In addition, although the examples described herein have various configurations, other configurations are possible in accordance with the disclosure.

[0037] A waste thread recycling device 100 is provided according to an aspect of the present disclosure, as Figure 1As shown, the waste silk recovery device 100 includes a driving assembly 110 and a winding assembly 120, the winding assembly 120 includes a winding piece 121 and a limiting piece 122, the winding piece 121 is detachably connected with the limiting piece 122, the winding piece 121 is used for winding the waste silk 400, one of the winding piece 121 and the limiting piece 122 is connected with the driving assembly 110, so that the driving assembly 110 can drive one of the winding piece 121 and the limiting piece 122 to rotate.

[0038] In the metal wire production process, the metal wire is wound on the bobbin 300, when it is detected that the metal wire on the bobbin 300 is unqualified, the waste silk 400 recovery is carried out using the waste silk recovery device 100 of the application. When the waste silk 400 recovery is carried out using the waste silk recovery device 100 of the application, the winding piece 121 and the limiting piece 122 need to be installed first, and the end of the waste silk 400 on the bobbin 300 is bonded on the winding piece 121, then one of the winding piece 121 and the limiting piece 122 is driven to rotate by the driving assembly 110, so that the waste silk 400 is wound on the winding piece 121, during the winding of the waste silk 400, the limiting piece 122 can block the waste silk 400 to avoid the waste silk 400 falling off the winding piece 121; after the winding of the waste silk 400 is completed, the winding piece 121 and the limiting piece 122 are disassembled, so that the winding piece 121 and the limiting piece 122 are separated, at this time, the limiting piece 122 does not block the waste silk 400, and the waste silk 400 can be stripped from the winding piece 121. In this way, the waste silk recovery device 100 of the application realizes the recovery of the waste silk 400 by cooperation of the driving assembly 110 and the winding assembly 120, without manual winding, which reduces the time and labor cost of the wire withdrawal, and improves the efficiency of the waste silk 400 recovery. At the same time, the waste silk 400 can be stripped from the winding piece 121 by separating the winding piece 121 and the limiting piece 122, without using a cutter to cut, which avoids scratching the winding assembly 120, and the winding assembly 120 can be reused, thereby reducing the cost of the waste silk 400 recovery.

[0039] In the embodiment of the application, as shown in Figure 2 and Figure 5As shown, the winding member 121 comprises an abutting portion 1211 and a winding portion 1212, one end of the winding portion 1212 in the axial direction of the winding assembly 120 is connected with the abutting portion 1211, and the other end of the winding portion 1212 in the axial direction of the winding assembly 120 is detachably connected with the limiting member 122. Part of the limiting member 122 protrudes in the radial direction of the winding assembly 120 relative to the winding portion 1212, and part of the abutting portion 1211 protrudes in the radial direction of the winding assembly 120 relative to the winding portion 1212. The size of the winding portion 1212 in the axial direction is greater than the size of the abutting portion 1211 in the axial direction. In this way, when the waste silk 400 is recycled, the end of the waste silk 400 can be bonded on the winding portion 1212. Since part of the limiting member 122 protrudes in the radial direction of the winding assembly 120 relative to the winding portion 1212, and part of the abutting portion 1211 protrudes in the radial direction of the winding assembly 120 relative to the winding portion 1212, this allows the abutting portion 1211 and the limiting member 122 to limit the waste silk 400 when the driving assembly 110 drives the winding assembly 120 to rotate for winding, so as to avoid the waste silk 400 from falling off the winding portion 1212 during winding.

[0040] Preferably, the abutting portion 1211 and the winding portion 1212 can be integrally formed.

[0041] Further, in the direction in which the abutting portion 1211 points to the limiting member 122, the diameter of the winding portion 1212 tapers, that is, the winding portion 1212 is in the shape of a circular truncated cone. In this way, after the winding member 121 and the limiting member 122 are detached, since the diameter of the winding portion 1212 close to the limiting member 122 side is smaller than the diameter of the winding portion 1212 close to the abutting portion 1211 side, the waste silk 400 can be easily peeled off from the side of the winding portion 1212 away from the abutting portion 1211.

[0042] Optionally, the winding portion 1212 is cut by a plane passing through the axis of the winding member 121 to obtain a first isosceles trapezoidal cross section, the base angle of the first isosceles trapezoidal cross section is greater than or equal to 45 degrees and less than 90 degrees, so as to ensure that the waste silk 400 can be peeled off from the side of the winding portion 1212 away from the abutting portion 1211.

[0043] Preferably, the base angle of the first isosceles trapezoidal cross section is 75 degrees.

[0044] In addition, as Figure 2 and Figure 5As shown, the winding portion 1212 is provided with a first mounting hole 1213 penetrating the winding portion 1212 along the axial direction, and the abutting portion 1211 is provided with a second mounting hole 1214 penetrating the abutting portion 1211 along the axial direction. The first mounting hole 1213 and the second mounting hole 1214 are communicated, and the rotating shaft 112 in the following driving assembly 110 can pass through the first mounting hole 1213 and the second mounting hole 1214 and be connected with the limiting piece 122. An end of the winding portion 1212 away from the abutting portion 1211 is provided with a second connecting hole (not shown) so as to facilitate the connection of the winding portion 1212 with the limiting piece 122 through a fastener. Figure 2

[0045] In the embodiments of the present application, as shown in Figure 4 The driving assembly 110 comprises a driving piece, a rotating shaft 112 and a housing 111. The driving piece is arranged inside the housing 111, and a part of the rotating shaft 112 extends into the inside of the housing 111 and is connected with the driving piece, so that the driving piece can drive the rotating shaft 112 to rotate. The rotating shaft 112 is connected with the connecting portion 1221 in the limiting piece 122, so that the rotating shaft 112 can drive the winding assembly 120 to rotate, thereby enabling the waste silk 400 to be wound on the winding portion 1212.

[0046] Preferably, the driving piece is a servo motor, and an output shaft of the servo motor is connected with the rotating shaft 112 through a shaft coupling, so that the servo motor can drive the rotating shaft 112 to rotate.

[0047] Alternatively, the rotating shaft 112 can also be connected with the winding piece 121, so that the rotating shaft 112 can drive the winding assembly 120 to rotate.

[0048] In the embodiments of the present application, as shown in Figure 3 and Figure 5 The limiting piece 122 comprises a limiting portion 1222 provided with a first connecting hole 1223 penetrating the limiting portion 1222, and the extension direction of the first connecting hole 1223 is parallel to the axial direction. The fastener can pass through the first connecting hole 1223 and the second connecting hole on the winding portion 1212 to realize the connection of the limiting portion 1222 with the winding portion 1212. The fastener can also be removed from the first connecting hole 1223 and the second connecting hole to separate the limiting piece 122 from the winding piece 121.

[0049] ​Optionally, the fastener is a screw, and threads are arranged on the hole wall of the first connecting hole 1223 and the hole wall of the second connecting hole, and the fastener can be matched with the threads on the hole wall of the first connecting hole 1223 and the threads on the hole wall of the second connecting hole, so that the winding member 121 is connected with the abutting member. The number of the first connecting holes 1223 can be multiple, and the multiple first connecting holes 1223 are arranged around the first mounting hole 1213, and each first connecting hole 1223 is correspondingly provided with a second connecting hole, and the first connecting hole 1223 and the corresponding second connecting hole are connected by the fastener.

[0050] Further, the limiting member 122 further comprises a connecting portion 1221, and the connecting portion 1221 is connected with the winding portion 1212. The connecting portion 1221 extends into the first mounting hole 1213 and abuts with the hole wall of the first mounting hole 1213, so as to realize the connection between the limiting member 122 and the winding member 121, and the limiting member 122 and the winding member 121 can rotate synchronously.

[0051] Preferably, in the direction in which the limiting portion 1222 points to the abutting portion 1211, the diameter of the connecting portion 1221 is tapered; a planar section of the connecting portion 1221 passing through the axis of the limiting member 122 obtains a second isosceles trapezoidal section, and the base angle of the second isosceles trapezoidal section is greater than or equal to 45 degrees and less than 90 degrees, that is, the connecting portion 1221 is in the shape of a circular truncated cone. By setting the connecting portion 1221 in the shape of a circular truncated cone, the connecting portion 1221 can be conveniently installed into the first mounting hole 1213.

[0052] Preferably, the base angle of the second isosceles trapezoidal section is 75 degrees.

[0053] Optionally, the connecting portion 1221 and the limiting portion 1222 are integrally formed. Part of the connecting portion 1221 can be in interference fit with the first mounting hole 1213, so as to ensure the stability of the installation between the connecting portion 1221 and the limiting portion 1222. When the limiting member 122 is connected with the winding member 121, the axis of the limiting member 122 coincides with the axis of the winding member 121.

[0054] Further, the connecting portion 1221 is provided with a first through hole penetrating the connecting portion 1221 in the axial direction, and the hole wall of the first through hole is provided with threads, and the outer side wall of the rotating shaft 112 is also provided with threads, and the threads on the hole wall of the first through hole are matched with the threads on the outer side wall of the rotating shaft 112, so that the rotating shaft 112 is connected with the connecting portion 1221, and the rotating shaft 112 can drive the winding assembly 120 to rotate.

[0055] In addition, the limiting portion 1222 is provided with a second through hole penetrating the limiting portion 1222 in the axial direction, and the first through hole and the second through hole are communicated, so that the rotating shaft 112 can pass out of the second through hole.

[0056] The waste filament recycling device 100 of this application can quickly wind waste filament 400 onto the winding member 121 and smoothly remove the waste filament 400 from the winding member 121, thereby improving the efficiency of waste filament 400 recycling. The winding member 120 can be reused, thereby reducing the cost of waste filament 400 recycling.

[0057] According to another aspect of this application, a waste filament recycling system is provided, such as... Figure 6 As shown, the waste wire recycling system includes a support device 200 and the aforementioned waste wire recycling device 100. The support device 200 supports a bobbin 300 on which waste wire 400 is wound. During the metal wire production process, the metal wire is wound onto the bobbin 300. When the metal wire on the bobbin 300 is detected to be substandard, the bobbin 300 can be mounted on the support device 200 to facilitate the recycling of the waste wire 400 on the bobbin 300.

[0058] Furthermore, such as Figure 6 and Figure 7 As shown, the support device 200 includes a support member 210 and a fixing member 220. The support member 210 is rod-shaped, and the fixing member 220 is cuboid-shaped. The support member 210 is fixed to the fixing member 220. The support member 210 can pass through the bobbin 300, allowing the bobbin 300 to rotate relative to the support member 210. The axis of the bobbin 300 is parallel to the axis of the winding assembly 120. During waste wire 400 recycling, the support member 210 passes through the bobbin 300, and the end of the waste wire 400 on the bobbin 300 is adhered to the winding portion 1212. Then, the drive unit is activated to wind the waste wire 400 onto the winding portion 1212. After the waste wire 400 is completely wound onto the winding portion 1212, the fastener is removed, and the limiting member 122 is moved out, thereby allowing the waste wire 400 to be peeled off from the winding portion 1212.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste thread recycling device characterized by comprising: The waste silk recycling device comprises a driving assembly and a winding assembly, the winding assembly comprises a winding piece and a limiting piece, the winding piece is detachably connected with the limiting piece, the winding piece is used for winding waste silk, and one of the winding piece and the limiting piece is connected with the driving assembly, so that the driving assembly can drive one of the winding piece and the limiting piece to rotate.

2. The waste thread recycling device according to claim 1, characterized by The winding piece comprises an abutting portion and a winding portion, two ends of the winding portion in the axial direction of the winding assembly are connected with the abutting portion and the limiting piece respectively, and part of the limiting piece protrudes in the radial direction of the winding assembly relative to the winding portion.

3. The waste thread recycling device according to claim 2, characterized in that, In the direction in which the abutting portion points to the limiting piece, the diameter of the winding portion gradually decreases; A first isosceles trapezoidal cross section is obtained by cutting the winding portion along a plane passing through the axis of the winding piece, the bottom angle of the first isosceles trapezoidal cross section is greater than or equal to 45 degrees and less than 90 degrees.

4. The waste thread recovery device according to claim 2 or 3, characterized in that, The waste silk recycling device further comprises a fastener, the limiting piece comprises a limiting portion, the limiting portion is provided with a first connecting hole, the winding portion is provided with a second connecting hole, and the fastener can pass through the first connecting hole and the second connecting hole.

5. The waste thread recycling device according to claim 4, characterized in that, The limiting piece further comprises a connecting portion, the connecting portion is connected with the winding portion, the driving assembly comprises a driving piece and a rotating shaft, the driving piece is connected with the rotating shaft, so that the driving piece can drive the rotating shaft to rotate, and the rotating shaft is connected with the connecting portion.

6. The waste thread recycling device according to claim 5, characterized in that, The winding portion is provided with a first mounting hole, the connecting portion can extend into the first mounting hole and abut against the hole wall of the first mounting hole.

7. The waste thread recycling device according to claim 6, characterized in that, The connecting portion is provided with a first through hole extending in the axial direction; The abutting portion is provided with a second mounting hole, the first through hole, the first mounting hole and the second mounting hole are in communication, the rotating shaft passes through the first mounting hole, the second mounting hole and the first through hole, and is threadedly connected with the connecting portion.

8. The waste thread recycling device according to claim 5, wherein In the direction in which the limiting portion points to the abutting portion, the diameter of the connecting portion gradually decreases; A second isosceles trapezoidal cross section is obtained by cutting the connecting portion along a plane passing through the axis of the limiting piece, the bottom angle of the second isosceles trapezoidal cross section is greater than or equal to 45 degrees and less than 90 degrees.

9. A waste thread recovery system characterized by, The waste silk recycling system comprises a supporting device and the waste silk recycling device according to any one of claims 1-8, the supporting device is used for supporting a bobbin, and the bobbin is wound with the waste silk.

10. The waste thread recovery system according to claim 9, characterized in that, The supporting device comprises a supporting piece and a fixing piece, the supporting piece is fixed on the fixing piece, and the supporting piece can pass through the bobbin, so that the bobbin can rotate relative to the supporting piece.

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