A bending needle device and waistband machine
By using linear drive components and magnetic automated control, the problem of easy loss and loosening of bolts in the looper device has been solved, achieving reliable fixation of the looper seat and efficient threading, thus improving sewing quality and automation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG WEIBIMA INTELLIGENT SEWING TECH CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-06-02
AI Technical Summary
In existing technologies, the bolts in the looper device are prone to being lost or loosened during threading, which increases the difficulty of threading and leads to unstable sewing quality.
A linear drive assembly is used to drive the insert shaft to fix and release the bent needle holder, and the magnetic repulsion principle is used to automatically swing it to the operating position, eliminating the need for manual bolt fixing and improving the degree of automation.
It effectively avoids the problems of easy loss and loosening of bolts, provides more operating space and higher visibility, reduces the difficulty of threading, and improves the fixation reliability and automation of the sewing position.
Smart Images
Figure CN224313843U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sewing equipment technology, specifically relating to a bending needle device and a waistband machine. Background Technology
[0002] In the sewing industry, to flexibly meet customers' sewing needs for different needle positions, various types of loopers are pre-installed on the looper holder of waistband sewing machines. However, when the looper needs to be threaded, the surrounding components such as the needle plate not only obstruct the operator's view but also reduce the operating space for threading, increasing the difficulty and time cost of threading.
[0003] To reduce the difficulty of threading loopers, invention patent application CN200610059747X discloses a looper pull-out device in a double-thread lockstitch sewing machine. The looper seat, used to fix the looper, can swing back and forth between the sewing operation position and a forward-tilting position relative to the looper rod. This allows the looper seat to swing to a forward-tilting position with more operating space and higher visibility when threading is needed, thereby reducing threading difficulty and improving threading efficiency. Simultaneously, to ensure the stability of the looper at the sewing operation position during operation, the patent includes a fixing-releasing mechanism that allows the looper seat to be fixed and detached from the sewing operation position. This fixing-releasing mechanism includes a bolt hole and a bolt. The bolt hole is formed through a protruding part of the looper seat with a looper rod insertion hole, and the bolt is screwed into the bolt hole. By turning the bolt, the relative fixation or release of the looper seat and looper rod can be achieved. Therefore, it can be seen that when the looper needs to be threaded, this patent requires manually loosening the bolts to release the relative fixation between the looper seat and the looper rod, so as to switch the looper seat from the sewing operation position to the forward tilting position. After the looper is threaded and the looper seat returns to the sewing operation position, the bolts need to be tightened to fix the looper seat and the looper rod relative to each other, so as to fix the looper seat in the sewing operation position. Not only is there a possibility that the bolts may be lost, but during long-term operation of the equipment, the bolts are also very likely to gradually loosen due to equipment vibration, causing the looper seat to shift axially and affecting the sewing quality. Utility Model Content
[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a looper device and waistband machine that can reliably fix the looper seat at the sewing position.
[0005] To achieve the above and other related objectives, this utility model provides a looper device, including a looper shaft and a looper seat, wherein the looper seat is used to mount a looper; the looper seat is axially fixed and rotatably mounted on the looper shaft; the looper device further includes a clutch assembly and a linear drive assembly; the clutch assembly includes an insert shaft, which is movably inserted into the looper seat; the linear drive assembly is used to drive the insert shaft to reciprocate along its own axis, so that the looper seat is circumferentially fixed or unfixed with the looper shaft; when the looper seat is unfixed with the looper shaft, the looper seat can rotate around the axis of the looper shaft; this utility model only needs to drive the insert shaft to reciprocate through the linear drive assembly to achieve the fixing and unfixing of the looper seat at the sewing position, effectively avoiding the problem of easy loss and loosening of bolts when using traditional bolt fixing, and ensuring the reliability of the looper seat's restoration and fixation.
[0006] Preferably, the clutch assembly 40 includes a socket 41, which is fixedly connected to the bent needle shaft 10; the insertion shaft 42 can be inserted and engaged with the socket 41 under the drive of the linear drive assembly 50, and fix the bent needle seat 20 to the socket 41.
[0007] Preferably, the bend holder is provided with a first magnet, and the socket is provided with a second magnet that cooperates with the first magnet; when the bend holder is released from the socket, the second magnet and the first magnet have the same polarity; in this way, the mechanism of like poles repelling each other can be used to make the released bend holder automatically swing to a position close to the operator's position.
[0008] Preferably, both the first magnet and the second magnet are permanent magnets.
[0009] Preferably, the first magnet is a permanent magnet and the second magnet is an electromagnet; by adjusting the direction of the current in the electromagnet, the polarity of the electromagnet is the same as or opposite to that of the permanent magnet; in this way, the swing control of the bent needle seat after the fixation is released can be realized by utilizing the mechanism that like poles repel and unlike poles attract.
[0010] Preferably, the insert shaft is arranged parallel to the bent needle shaft.
[0011] Preferably, the linear drive assembly drives the insert shaft to reciprocate along its own axial direction via a lever; the lever has a mounting portion and a shift fork portion, the mounting portion of the lever is axially fixed to the movable end of the linear drive assembly and can rotate circumferentially relative to the movable end of the linear drive assembly; the shift fork portion has a groove extending along the length direction of the lever, the insert shaft is axially engaged with the shift fork portion and can slide within the groove; thus, the insert shaft can achieve smooth swinging of the bending needle seat without completely withdrawing from the bending needle seat, thereby reducing the travel of the insert shaft.
[0012] Preferably, the insert shaft includes an insert shaft body that slides with the slot, and two first retaining rings are fixedly spaced on the insert shaft body, the two first retaining rings cooperating to restrict the axial position of the shift fork.
[0013] Preferably, the outer wall of the insert shaft is provided with an annular groove; the shift fork is engaged in the annular groove, and the thickness of the shift fork matches the width of the annular groove.
[0014] Preferably, the linear drive assembly includes a telescopic drive member, which is used to drive the insertion shaft to reciprocate along its own axial direction.
[0015] This utility model also provides a waistband machine, which includes the above-mentioned needle bending device.
[0016] As described above, the bending needle device and waistband machine provided by this utility model have the following beneficial effects:
[0017] This utility model's looper device and waistband machine, when needing to thread a looper, first use a linear drive assembly to drive the insert shaft out of the socket to release the looper seat from the socket. Then, using the mechanism of magnetic repulsion, the released looper seat is automatically swung to a position close to the operator's position, thus providing a larger operating space for threading and reducing or avoiding obstruction of the threading view by components such as the needle plate, resulting in higher visibility. After threading, simply rotate the looper seat back to its previous position, and then use the linear drive assembly to drive the insert shaft to simultaneously insert into the socket and looper seat, achieving automatic fixation between the looper seat and the socket. Throughout the entire operation, no manual fixing with bolts is required, effectively avoiding the problems of easy loss or loosening of bolts in existing technologies, ensuring the reliability of the looper seat's fixation at the sewing position, and greatly reducing manual operation steps, resulting in a high degree of automation. Attached Figure Description
[0018] Figure 1 This is a perspective view of a bending needle device provided in an embodiment of this application.
[0019] Figure 2 for Figure 1 A 3D view after removing the casing.
[0020] Figure 3 for Figure 2 A 3D view after removing the bend and connector.
[0021] Figure 4 for Figure 3 An embodiment of a curved needle seat.
[0022] Figure 5 for Figure 3 One embodiment of a socket.
[0023] Figure 6 for Figure 3 A schematic diagram of the center lever.
[0024] Figure 7 for Figure 3 Example 1 of the middle insertion shaft.
[0025] Figure 8 for Figure 3 Example 2 of the middle insertion shaft.
[0026] Figure 9 for Figure 3 The diagram shows the state of the looper device at the sewing position.
[0027] Figure 10 for Figure 3 The diagram shows the state of the bending needle device in the operating position.
[0028] Figure 11 This is a top view of the bent needle device at the sewing position in another embodiment.
[0029] Figure 12 for Figure 11 Top view showing the release of the looper device at the sewing position.
[0030] Explanation of reference numerals in the attached figures
[0031] 10-inch bend shaft;
[0032] 20, a bent needle seat, a first needle shaft hole 20a, a first insert shaft hole 20b, a bent needle seat body 21, and an ear seat 22;
[0033] 30 bent needle, 31 connecting seat;
[0034] Clutch assembly 40, socket 41, socket body 411, second pin shaft hole 41a, second insertion shaft hole 41b, opening groove 41c, clamping part 412, bolt hole 412a, insertion shaft 42, insertion shaft body 421, first retaining ring 422, annular groove 42, bolt 43.
[0035] Linear drive assembly 50, telescopic drive component 51, adapter plate 52, push-pull rod 53;
[0036] First magnet 61, second magnet 62, magnet mounting base 621;
[0037] 70 lever, 71 mounting part, 72 shift fork part, 721 slot;
[0038] Limiting sleeve 80;
[0039] Casing 90, driver mounting plate 91. Detailed Implementation
[0040] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.
[0041] Please see Figures 1 to 12 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.
[0042] like Figure 1 and Figure 2 As shown, the bend needle device provided by this utility model includes a bend needle shaft 10 and a bend needle seat 20; wherein, the bend needle seat 20 is used to install the bend needle 30; the bend needle seat 20 is axially fixed and can be circumferentially rotatably mounted on the bend needle shaft 10; in this way, the bend needle seat 20 can rotate around the axis of the bend needle shaft 10 to switch between the sewing position and the operating position close to the threader; when the bend needle seat 20 rotates to the operating position, it can not only provide a larger operating space for threading the bend needle, but also reduce the obstruction of the threading field of vision by the needle plate and other components, and reduce the difficulty of threading.
[0043] For ease of description, in the following embodiments, the axial direction of the bend shaft 10 is defined as the left-right direction, the side of the bend shaft 10 closer to the threader is defined as the front direction, the side of the bend shaft away from the threader is defined as the rear direction, and the direction orthogonal to both the left-right and front-rear directions is defined as the up-down direction. Based on this, Figure 1 In the view shown, the x-direction is the forward direction, the y-direction is the left direction, and the z-direction is the upward direction.
[0044] To ensure the reliability of the looper 30 and the ease of threading, the looper seat 20 at the sewing position needs to be fixed and released. Since the looper seat 20 is always axially fixed to the looper shaft 10, it is only necessary to fix and release the looper seat 20 circumferentially at the sewing position.
[0045] To achieve circumferential fixing and release of the looper seat 20 at the sewing position, such as Figure 2As shown, the bending device of this application also includes a clutch assembly 40 and a linear drive assembly 50; wherein, the clutch assembly 40 includes an insert shaft 42, and the insert shaft 42 is movably disposed on the bending needle seat 20; the insert shaft 42 is arranged parallel to or at an angle to the bending needle shaft 10, which is not limited, as long as there is no motion interference; the linear drive assembly 50 is used to drive the insert shaft 42 to reciprocate along its own axis, so that the insert shaft 42 is inserted into or withdrawn from the bending needle seat 20, thereby realizing the circumferential fixation or release of the bending needle seat 20 and the bending needle shaft 10.
[0046] Since the bent needle seat 20 and the bent needle shaft 10 are always axially fixed, and the insert shaft 42 is automatically driven to move by the linear drive assembly 50, the circumferential fixing and fixing release of the bent needle seat 20 can be realized. This not only effectively avoids the problem of easy loss and loosening of bolts when using bolt fixing in the prior art, and ensures the fixing reliability of the bent needle seat 20, but also has the advantage of high degree of automation.
[0047] In a further embodiment, such as Figure 2 As shown, the clutch assembly 40 also includes a socket 41, which is fixedly mounted on the bent needle shaft 10. The insert shaft 41 can be inserted into the socket 41 under the drive of the linear drive assembly, thereby fixing the bent needle seat 20 to the socket 41. In other words, the insert shaft 41 can be inserted into both the bent needle seat 20 and the socket 41 simultaneously to ensure the reliability of the circumferential fixation of the bent needle seat 20.
[0048] Figure 11 , Figure 12 The diagrams show a fixed top view and a detached top view of the looper device at the sewing position in the above embodiment. Figure 11 It can be seen that when the linear drive assembly 50 drives the insertion shaft 42 to simultaneously engage with the looper seat 20 and the socket 41, the looper seat 20, the looper shaft 10, and the socket 41 can be relatively fixed to ensure the reliability of the looper seat 20 at the sewing position. Figure 12 It can be seen that when the linear drive assembly 50 drives the insertion shaft 42 to simultaneously exit the socket 41 and the bent needle holder 20, the circumferential fixation between the bent needle holder 20 and the bent needle shaft 10 is released, allowing the bent needle holder 20 to rotate around the bent needle shaft 10 to a position close to the operator's position, so as to facilitate subsequent bent needle threading operations.
[0049] but Figure 11 , Figure 12 The looper device of the embodiment shown has a defect that the insertion shaft 42 has a large travel distance when the looper seat 20 is fixed and unfixed at the sewing position, resulting in a large space occupation of the looper device in the left and right directions.
[0050] To reduce the travel of the insert shaft 42, in a further embodiment, such as Figure 2 and Figure 3As shown, the insert shaft 42 and the bending needle shaft 10 are arranged in parallel, and the linear drive assembly 50 drives the insert shaft 42 to reciprocate along its own axis via the lever 70; the structure of the lever 70 is as follows. Figure 6 As shown, the lever 70 has a mounting portion 71 and a shift fork portion 72; wherein, the mounting portion 71 of the lever 70 is axially fixed to the movable end of the linear drive assembly 50 and can rotate circumferentially relative to the movable end of the linear drive assembly 50; the shift fork portion 72 has a groove 721 extending along the length direction of the lever, and the insert shaft 42 is axially engaged with the shift fork portion 72 and can slide within the groove 721.
[0051] Thus, the insert shaft 42 only needs to be partially inserted into or completely withdrawn from the socket 41 to achieve circumferential fixation or fixation release of the looper seat 20, effectively reducing the travel of the insert shaft 42 when switching between circumferential fixation and fixation release of the looper seat 20 at the sewing position.
[0052] Figure 9 and Figure 10 The diagrams show the state of the looper device, including the lever 70, in the sewing position and the operating position, respectively. Figure 9 and Figure 10 It can be seen that when threading a bent needle is required, the linear drive assembly 50 is used to drive the lever 70 to move away from the socket 41, so that the lever 70 drives the insert shaft 42 out of the socket 41, thereby releasing the fixed position of the bent needle holder 20. During this process, the insert shaft 42 is always inserted into the bent needle holder 20. Then, the bent needle holder 20 is swung closer to the operating position of the threader. During this process, the insert shaft 42 slides upward along the slot 721 of the lever 70 while pushing the slot 721 around the linear drive assembly 50. The movable end of the looper 20 rotates to ensure smooth swinging of the looper 20. When the looper 20 needs to be restored after threading, it must first be swung to the sewing position. During this process, the insert shaft 42 slides down along the slot 721 of the lever 70 while pushing the slot 721 to rotate around the movable end of the linear drive assembly 50. Then, the linear drive assembly 50 drives the lever 70 to move towards the socket 41, so that the insert shaft 42 is partially inserted into the socket 41 through the lever 70, thereby achieving circumferential fixation of the looper 20.
[0053] In order to achieve the requirement that the insert shaft 42 and the fork portion 72 be axially engaged and slide within the slot 721, the insert shaft 42 has the following preferred embodiments.
[0054] Example 1 of insert shaft 42: Figure 7As shown, the insert shaft 42 includes an insert shaft body 421 and two first retaining rings 422. The two first retaining rings 422 are spaced apart on the insert shaft body 421, and the distance between the two first retaining rings 422 is adapted to the thickness of the shift fork portion 72. When the shift fork portion 72 is inserted between the two first retaining rings 422, the two first retaining rings 422 cooperate to restrict the axial position of the shift fork portion 72, so as to realize the snap-fit fixation of the shift fork portion 72 and the insert shaft 42 in the axial direction of the insert shaft 42. At the same time, the part of the insert shaft body 421 located between the two first retaining rings 422 can enter the slot 721 of the shift fork portion 72 and slide with the slot 721, so that when the bent needle seat 20 swings around the bent needle shaft 10, the insert shaft 42 passing through the bent needle seat 20 can slide and rotate in the slot 721 of the lever 70, so as to ensure that the insert shaft 42 can swing around the bent needle shaft 10 together with the bent needle seat 20.
[0055] Example 2 of insert shaft 42: Figure 8 As shown, the outer wall of the insert shaft 42 is provided with an annular groove 42a; the shift fork 72 is engaged in the annular groove 42a so that the slot 721 of the shift fork 72 slides with the bottom of the groove of the annular groove 42a; in addition, the thickness of the shift fork 72 matches the width of the annular groove 42a so that the opposite side walls of the annular groove 42a can be used to axially limit the shift fork 72 so that the linear drive assembly 50 can drive the insert shaft 42 to move along its own axis through the shift lever 70.
[0056] In a preferred embodiment, such as Figure 11 and Figure 12 As shown, the socket 41 is located on one side of the bent needle seat 20, and the other side of the bent needle seat 20 is provided with a limiting sleeve 80 fixed on the bent needle shaft 10; the limiting sleeve 80 cooperates with the socket 41 to limit the axial position of the bent needle seat 20 on the bent needle shaft 10.
[0057] In a preferred embodiment, such as Figure 4 As shown, the bend needle holder 20 includes a bend needle holder body 21 and two ear seats 22; wherein, the bend needle holder body 21 is provided with a first needle shaft hole 20a for the bend needle shaft 10 to pass through; the two ear seats 22 are spaced apart on the rear side of the bend needle holder body 21 along the axial direction of the first needle shaft hole 20a, and the two ear seats 22 are provided with first insertion shaft holes 20b that slide and engage with the insertion shaft 42; at this time, as Figure 3 As shown, the fork portion 72 of the lever 70 is preferably disposed between the two lugs 22 so that the mounting position of the linear drive assembly 50 is closer to the socket 41, thereby further reducing the space occupied by the bending needle device in the left-right direction.
[0058] In an alternative embodiment, such as Figure 2 As shown, the bent needle 30 is fixed on the connecting seat 31, and the connecting seat 31 is detachably fixed to the bent needle seat body 21 of the bent needle seat 20 by bolts.
[0059] In a preferred embodiment, such as Figure 2 and Figure 5 As shown, the socket 41 is fitted onto the bent pin shaft 10, and then the socket 41 is detachably fixed to the bent pin shaft 10 using bolts 43; at this time, the structure of the socket 41 is as follows. Figure 5 As shown, the socket 41 includes a socket body 411, which has a second pin shaft hole 41a for the bending pin shaft 10 to pass through and a second insertion shaft hole 41b that mates with the insertion shaft 42. The second pin shaft hole 41a is located in front of the second insertion shaft hole 41b, and the front wall of the socket body 411 has an opening groove 41c that communicates with the second pin shaft hole 41a. Thus, the upper and lower side walls of the opening groove 41c can form two spaced clamping parts 412. The two clamping parts 412 are provided with bolt holes 412a that mate with bolts 43. When the socket 41 is inserted into the bending pin shaft 10 through the second pin shaft hole 41a, tightening the bolts 43 in the bolt holes 412a will tighten the two clamping parts 412 and lock the socket 41 onto the bending pin shaft 10.
[0060] Of course, in other embodiments, the socket 41 can also be fixed to the bent pin shaft 10 by welding, interference fit or other means.
[0061] In a preferred embodiment, such as Figure 3 As shown, a first magnet 61 is provided on the bent needle holder 20, and a second magnet 62 that cooperates with the first magnet 61 is provided on the socket 41. When the bent needle holder 20 is released from the socket 41, the second magnet 62 and the first magnet 61 have the same polarity, so as to use the mechanism of like poles repelling each other to automatically swing the released bent needle holder 20 to the operating position, so as to further reduce the manual operation steps.
[0062] Specifically, such as Figure 3 As shown, the first magnet 61 is fixed to the bottom of the looper seat 20 and is located on the rear side of the looper seat 20; the second magnet 62 is fixed to the bottom of the socket 41 through the magnet mounting base 621; when the looper seat 20 is in the sewing position, the first magnet 61 and the second magnet 62 are arranged vertically.
[0063] In some embodiments, both the first magnet 61 and the second magnet 62 are permanent magnets.
[0064] Of course, in other embodiments, the first magnet 61 is a permanent magnet and the second magnet 62 is an electromagnet; thus, by adjusting the direction of the current in the electromagnet, the polarity of the electromagnet can be the same as or opposite to that of the permanent magnet. Therefore, when the bent needle holder 20 is released from its fixed position, the mechanism of like poles repelling each other can be used to automatically swing the released bent needle holder 20 to the operating position; after threading is completed, the mechanism of opposite poles attracting each other can be used to automatically swing the released bent needle holder 20 to the sewing position, further improving the degree of automation.
[0065] It should be noted that the linear drive assembly 50 and the electromagnet are controlled by a control device equipped with a control panel. Since the mechanism by which the control device controls the linear drive assembly 50 and the electromagnet is conventional technology, it will not be described in detail here.
[0066] like Figure 2 As shown, the linear drive assembly 50 mentioned above includes a telescopic drive member 51, which is used to drive the insert shaft 42 to reciprocate along its own axial direction. The structure of the telescopic drive member 51 includes, but is not limited to, various linear drive members that can achieve linear reciprocating movement in a given direction, such as linear motors, motor screw mechanisms, cylinders, and hydraulic cylinders.
[0067] In an alternative embodiment, such as Figure 1 and Figure 2 As shown, the linear drive assembly 50 also includes an adapter plate 52 and a push-pull rod 53, and the drive end of the telescopic drive member 51 is connected to the push-pull rod 53 through the adapter plate 52; wherein, both the telescopic drive member 51 and the push-pull rod 53 are located on the side of the adapter plate 52 near the socket 41, and the mounting part 71 of the lever 70 is rotatably mounted on the push-pull rod 53. At this time, in order to ensure the movement stability of the push-pull rod 53, an additional guide support seat is required to guide and support the push-pull rod 53.
[0068] In an alternative embodiment, such as Figure 1 and Figure 2 As shown, the bending device also includes a housing 90 with an open top; wherein, the bending shaft 10 is fixedly disposed inside the housing 90, and the housing 90 has a drive mounting plate 91 for mounting the telescopic drive member 51; at this time, the guide support can be fixedly disposed on the drive mounting plate 91.
[0069] This utility model also includes a waistband machine, which includes the above-mentioned needle bending device.
[0070] In summary, this invention optimizes the bending needle device, transforming the original bolt-fixed bending needle seat 20 at the sewing position into a scheme where a linear drive assembly drives the insert shaft to lock the bending needle seat 20. This not only avoids the problems of bolt loss and loosening but also eliminates the manual fixing and unfixing steps, improving automation. Furthermore, the inclusion of the first magnet 61 and the second magnet 62 enables the automatic swinging of the bending needle seat 20 after fixing is released, replacing the manual swinging step and further enhancing automation. Therefore, this invention effectively overcomes the various shortcomings of the prior art and possesses high industrial applicability.
[0071] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A needle bending device, comprising a needle bending shaft (10) and a needle bending seat (20), the needle bending seat (20) being used to mount a needle (30); characterized in that, The bend holder (20) is axially fixed and circumferentially rotatable on the bend shaft (10); the bend device also includes a clutch assembly (40) and a linear drive assembly (50); the clutch assembly (40) includes a insert shaft (42) which is movably inserted on the bend holder (20); the linear drive assembly (50) is used to drive the insert shaft (42) to reciprocate along its own axis so that the bend holder (20) is circumferentially fixed or unfixed with the bend shaft (10); when the bend holder (20) is unfixed with the bend shaft (10), the bend holder (20) can rotate around the axis of the bend shaft (10).
2. The needle bending device according to claim 1, characterized in that, The clutch assembly (40) includes a socket (41) which is fixedly connected to the bent needle shaft (10); the insertion shaft (42) can be inserted into the socket (41) under the drive of the linear drive assembly (50), and the bent needle seat (20) is fixed to the socket (41).
3. The needle bending device according to claim 2, characterized in that, The bent needle holder (20) is provided with a first magnet (61), and the socket (41) is provided with a second magnet (62) that cooperates with the first magnet (61); when the bent needle holder (20) and the socket (41) are fixedly released, the second magnet (62) and the first magnet (61) have the same polarity.
4. The needle bending device according to claim 3, characterized in that, Both the first magnet (61) and the second magnet (62) are permanent magnets.
5. The needle bending device according to claim 4, characterized in that, The first magnet (61) is a permanent magnet, and the second magnet (62) is an electromagnet; by adjusting the direction of the current in the electromagnet, the polarity of the electromagnet is the same as or opposite to that of the permanent magnet.
6. A needle bending device according to any one of claims 1 to 5, characterized in that, The insert shaft (42) is arranged parallel to the bent needle shaft (10).
7. A needle bending device according to claim 6, characterized in that, The linear drive assembly (50) drives the insert shaft (42) to reciprocate along its own axial direction via a lever (70); the lever (70) has a mounting part (71) and a shift fork part (72), the mounting part (71) of the lever (70) is axially fixed to the movable end of the linear drive assembly (50) and can rotate circumferentially relative to the movable end of the linear drive assembly (50); the shift fork part (72) has a slot (721) extending along the length direction of the lever, the insert shaft (42) is axially engaged with the shift fork part (72) and can slide in the slot (721).
8. A needle bending device according to claim 7, characterized in that, The insert shaft (42) includes an insert shaft body (421) that slides with the slot (721). Two first retaining rings (422) are fixedly spaced on the insert shaft body (421). The two first retaining rings (422) cooperate to restrict the axial position of the shift fork (72).
9. A needle bending device according to claim 7, characterized in that, The outer wall of the insert shaft (42) is provided with an annular groove (42a); the shift fork (72) is engaged in the annular groove (42a), and the thickness of the shift fork (72) matches the width of the annular groove (42a).
10. A waistband machine, characterized in that, Includes the bending needle device according to any one of claims 1 to 9.