Thread trimming mechanism of sewing machine and sewing machine
By introducing a capture piece driving mechanism into the sewing machine, actively separating the arc-shaped capture piece and the first thread-cutter, the wear and collision problems caused by passive motion are solved, and stable bottom line capture and efficient seam-starting effect are achieved.
Patent Information
- Application Number
- CN202420662840.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-04-01
AI Technical Summary
In the thread cutting mechanism of existing sewing machines, the movement of the bottom thread capturing member is passive, resulting in an increased risk of wear and collision between the arc-shaped capture piece and the first thread cutting knife.
A thread cutting mechanism of a sewing machine is designed, and a capture member driving mechanism is adopted. Through the cooperation of the coil and the iron core, the bottom line capture member is actively driven to separate from the first thread cutting knife to avoid the downward pressure of the second thread cutting knife, and the elastic structure is used to keep the capture member in the capture position.
It effectively reduces wear and collision problems, ensures smooth thread cutting, improves the seam line rate, ensures stable capture of the bottom line head, and prevents the bird's nest from becoming larger.
Smart Images
Figure CN223134760U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sewing equipment, in particular to a thread cutting mechanism of a sewing machine and a sewing machine. Background Art
[0002] When a flat sewing machine starts sewing, it is easy to have the phenomenon that the thread cannot be picked up at the start of sewing. A mechanism is needed to capture the end of the bobbin thread after thread cutting. The utility model patent with the application number CN2022202590516 discloses a thread cutting mechanism of a sewing machine, which is provided with a bobbin thread capture member. A second capture portion is provided on the outer arc surface of the arc-shaped capture piece of the bobbin thread capture member, and is matched with the first capture portion on the first thread cutting knife to form a bobbin thread capture structure. However, in this technical solution, the movement of the bobbin thread capture member is passive. When starting the thread cutting action, the second thread cutting knife needs to press down the arc-shaped capture piece or lift up the first thread cutting knife to open the arc-shaped capture piece and the first thread cutting knife, and then the second thread cutting knife is inserted between the arc-shaped capture piece and the first thread cutting knife. This will increase the wear of the second thread cutting knife and the arc-shaped capture piece or the first thread cutting knife, and there is also a risk of collision. Summary of the Utility Model
[0003] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the utility model is to provide a thread cutting mechanism of a sewing machine and a sewing machine, which can actively separate the arc-shaped capture piece and the first thread cutting knife before thread cutting to avoid wear and collision problems.
[0004] To achieve the above object, the utility model provides a thread cutting mechanism of a sewing machine, which is used for thread cutting at the bobbin of the sewing machine. The thread cutting mechanism includes a first thread cutting knife, a second thread cutting knife and a bobbin thread capture member. The first thread cutting knife is fixedly installed on the outer peripheral side of the bobbin. The second thread cutting knife is arranged on the outer peripheral side of the bobbin and can rotate around the bobbin to engage or separate from the first thread cutting knife. A thread cutting hook for driving the bobbin thread to move towards the first thread cutting knife is provided on the second thread cutting knife. The bobbin thread capture member includes an arc-shaped capture piece arranged along the outer peripheral side of the bobbin. A first capture portion is provided on the side surface of the first thread cutting knife facing the bobbin. A second capture portion is provided on the outer arc surface of the arc-shaped capture piece. The thread cutting mechanism further includes a capture member driving mechanism, which can drive the bobbin thread capture member to move close to the first thread cutting knife to a capture position. When the bobbin thread capture member is in the capture position, the second capture portion is matched with the first capture portion of the first thread cutting knife to form a bobbin thread capture structure, or drive the bobbin thread capture member to move to a position where the arc-shaped capture piece is far away from the first thread cutting knife.
[0005] Furthermore, the thread cutting mechanism further includes a fixedly arranged capture positioning surface. When the bobbin thread capture member moves to abut against the capture positioning surface, it is in the capture position.
[0006] Further, the driving mechanism of the catching member includes a housing, a coil, an iron core, and an elastic structure. The housing is fixedly installed in the sewing machine. The coil is installed in the housing. The iron core is arranged in the coil. The bobbin thread catching member is installed on the iron core. When the coil is energized, the iron core drives the bobbin thread catching member to move to a position where the arc-shaped catching piece is away from the first thread cutter. The elastic force of the elastic structure can drive the bobbin thread catching member to move towards the catching position, and when the coil is not energized, the elastic structure can keep the bobbin thread catching member at the catching position.
[0007] Further, the driving mechanism of the catching member is installed on the housing of the sewing machine. A catching member limiting groove is provided on the housing. The bobbin thread catching member includes a catching member mounting portion. The catching member mounting portion is connected to the driving mechanism of the catching member and is located in the catching member limiting groove.
[0008] Further, the catching member mounting portion of the bobbin thread catching member is sleeved on the iron core. The driving mechanism of the catching member further includes a fastener structure for locking and fixing the catching member mounting portion on the iron core. When the fastener structure is loosened, the bobbin thread catching member can rotate around the iron core.
[0009] Further, the iron core has a catching member connection section and a shoulder surface at one end of the catching member connection section. An external thread is provided on the catching member connection section. The catching member mounting portion is sleeved on the catching member connection section through a through hole. The fastener structure includes a locking nut screwed on the catching member connection section. The locking nut presses the catching member mounting portion against the shoulder surface.
[0010] Further, a receiving center hole is formed in the housing. The coil and the iron core are both located in the receiving center hole. A notch is further provided on the hole wall of the receiving center hole. The power lead of the coil extends out from the notch.
[0011] Further, the driving mechanism of the catching member further includes a guide bushing fixed in the housing and a guide rod located in the guide bushing. The guide rod is fixedly connected to the iron core.
[0012] Further, a housing mounting portion is provided in the housing of the driving mechanism of the catching member. A strip-shaped hole is formed in the housing mounting portion. The housing mounting portion is fixedly connected to the housing of the sewing machine by bolts. The bolts are located in the strip-shaped hole.
[0013] The present utility model also provides a sewing machine, including the above-mentioned thread cutting mechanism.
[0014] As described above, the thread cutting mechanism and the sewing machine involved in the present utility model have the following beneficial effects:
[0015] 1. By setting up a catcher driving mechanism, the bottom thread catcher is changed from a passive action to an active action, which can actively drive the arc-shaped catcher to separate from the first thread cutter before thread cutting, avoiding the downward pressure action of the second thread cutter on the arc-shaped catcher, effectively reducing wear and collision problems, and ensuring that the second thread cutter can smoothly enter between the arc-shaped catcher and the first thread cutter.
[0016] 2. The catcher driving mechanism controls the energization of the control coil and uses the iron core to drive the movement of the bottom thread catcher, which is convenient to control and has a simple structure.
[0017] 3. The thread cutting mechanism can keep the position of the bottom thread end, fix it in a small area, and also ensure that when starting sewing, the surface thread loop can accurately catch the bottom thread end, with a good starting sewing thread feeding rate. When starting sewing, the caught bottom thread end is released to ensure that the bottom thread bird's nest will not become larger. Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of the thread cutting mechanism of the present utility model.
[0019] Figure 2 It is an exploded view of the thread cutting mechanism of the present utility model.
[0020] Figure 3 It is a schematic structural diagram of the catcher driving mechanism in the present utility model.
[0021] Figure 4 It is a schematic structural diagram of the part of the catcher driving mechanism located inside the housing in the present utility model.
[0022] Figure 5 It is a schematic structural diagram of the iron core, guide bushing and spring in the present utility model.
[0023] Figure 6 It is a schematic structural diagram of the sewing machine housing in the present utility model.
[0024] Figure 7 It is a schematic working diagram of the thread cutting mechanism of the present utility model before thread cutting.
[0025] Figure 8 It is a schematic working diagram of the thread cutting mechanism of the present utility model during thread cutting.
[0026] Description of the Reference Numerals in the Drawings
[0027] 1 Machine housing
[0028] 11 Catching and positioning surface
[0029] 12 Catcher limiting groove
[0030] 13 Counterbore
[0031] 14 Threaded hole
[0032] 15 Housing mounting surface
[0033] 2 Rotating hook
[0034] 3 First thread cutter
[0035] 4 Second thread cutter
[0036] 5 Bobbin thread catcher
[0037] 51 Arc-shaped catching piece
[0038] 52 Catcher mounting part
[0039] 6 Catcher driving mechanism
[0040] 61 Housing
[0041] 611 Housing mounting part
[0042] 612 Slot
[0043] 613 Notch
[0044] 62 Coil
[0045] 621 Power supply lead
[0046] 63 Iron core
[0047] 631 Catcher connection segment
[0048] 632 Shoulder surface
[0049] 64 Spring
[0050] 65 Locking nut
[0051] 66 Guide bushing
[0052] 67 Guide rod
[0053] 68 Pressure plate
[0054] 7 Second thread cutter holder
[0055] 8 Bolt Detailed implementation manners
[0056] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.
[0057] It should be noted that the structures, proportions, sizes, etc. depicted in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of narration and understanding, and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.
[0058] Refer to Figures 1 to 8 , the present utility model provides a thread cutting mechanism for a sewing machine, which is used to be arranged at the bobbin case 2 of the sewing machine for thread cutting. The thread cutting mechanism includes a first thread cutting knife 3, a second thread cutting knife 4, and a bobbin thread catching member 5. The first thread cutting knife 3 is fixedly installed on the outer peripheral side of the bobbin case 2. The second thread cutting knife 4 is arranged on the outer peripheral side of the bobbin case 2 and can rotate around the bobbin case 2 to engage or separate from the first thread cutting knife 3. A thread cutting hook for driving the bobbin thread towards the first thread cutting knife 3 is provided on the second thread cutting knife 4. Existing structures such as a thread cutting bulge and a thread separating part can also be provided on the second thread cutting knife 4. The bobbin thread catching member 5 includes an arc-shaped catching piece 51 arranged along the outer peripheral side of the bobbin case 2. A first catching part is provided on the side surface of the first thread cutting knife 3 facing the bobbin case 2. A second catching part cooperating with the first catching part is provided on the outer arc surface of the arc-shaped catching piece 51. The specific structures of the first thread cutting knife 3, the second thread cutting knife 4, and the bobbin thread catching member 5 can all adopt existing designs. The main improvement of the present utility model lies in that a catching member driving mechanism 6 is further provided. The catching member driving mechanism 6 can drive the bobbin thread catching member 5 to move close to the second thread cutting knife 4 to the catching position, and when the bobbin thread catching member 5 is in the catching position, the second catching part cooperates with the first catching part of the first thread cutting knife 3 to form a bobbin thread catching structure, or drive the bobbin thread catching member 5 to move to the position where the arc-shaped catching piece 51 is away from the first thread cutting knife 3.
[0059] The basic working principle of the thread cutting mechanism involved in the present utility model is as follows: During normal operation, refer to Figure 7, the second thread cutter 4 remains stationary and moves away from the first thread cutter 3. At this time, the bottom thread catcher 5 is in the catching position, the arc-shaped catching piece 51 is close to the first thread cutter 3, the second catching portion on the arc-shaped catching piece 51 is close to or abuts against the first catching portion on the first thread cutter 3, and the rotary hook 2 can rotate normally. When thread cutting is required, the catcher driving mechanism 6 operates to drive the bottom thread catcher 5 to move. The arc-shaped catching piece 51 moves a certain distance in the direction away from the first thread cutter 3 (i.e., the direction close to the rotary hook 2), so that a certain distance is separated between the arc-shaped catching piece 51 and the first thread cutter 3. Then, the second thread cutter 4 rotates towards the first thread cutter 3 driven by the second thread cutter holder 7. The second thread cutter 4 can drive the bottom thread and the top thread to be smoothly inserted between the arc-shaped catching piece 51 and the first thread cutter 3 and extend between the first catching portion and the second catching portion. Then, the second thread cutter 4 and the first thread cutter 3 bite to cut the thread, and the bottom thread and the top thread complete thread cutting within the opening of the opened bottom thread catching structure. See Figure 7 . After thread cutting is completed, the second thread cutter 4 rotates back to its original position and leaves the first thread cutter 3. The catcher driving mechanism 6 operates to drive the bottom thread catcher 5 to return to the catching position. The second catching portion on the arc-shaped catching piece 51 cooperates with the first catching portion on the first thread cutter 3 to catch the bottom thread end, thus ensuring the stable position of the bottom thread end after thread cutting. By setting the catcher driving mechanism 6, compared with the existing design, the bottom thread catcher 5 is changed from a passive action to an active action, and the arc-shaped catching piece 51 can be actively driven to separate from the first thread cutter 3 before thread cutting, avoiding the downward pressing action of the second thread cutter 4 on the arc-shaped catching piece 51, effectively reducing the wear problem and the collision problem, and ensuring that the second thread cutter 4 can smoothly enter between the arc-shaped catching piece 51 and the first thread cutter 3.
[0060] In this embodiment, see Figure 1 , as a preferred design, a fixed catching and positioning surface 11 is provided on the machine shell 1 of the sewing machine. When the bottom thread catcher 5 moves close to the first thread cutter 3 and abuts against the catching and positioning surface 11, it reaches the catching position, thereby ensuring the stable position of the bottom thread catcher 5. Of course, the catching and positioning surface 11 can also be provided on other fixed parts of the sewing machine.
[0061] In this embodiment, see Figure 1, as a preferred design, the catcher driving mechanism 6 includes a housing 61, a coil 62, an iron core 63 and an elastic structure. The housing 61 is fixedly installed in the sewing machine to play a role in protection and support. The coil 62 is installed in the housing 61, the iron core 63 is arranged in the coil 62, the bobbin catcher 5 is installed on the iron core 63. When the coil 62 is energized, the iron core 63 moves axially, driving the bobbin catcher 5 to move to a position where the arc-shaped catcher piece 51 is away from the first thread cutter 3. The elastic force of the elastic structure can drive the bobbin catcher 5 to move towards the catching position, and when the coil 62 is not energized, the elastic structure can keep the bobbin catcher 5 in the catching position. With the above design, by controlling the energization and de-energization of the coil 62, the separation or retention of the arc-shaped catcher piece 51 and the first thread cutter 3 can be controlled, with a simple structure and convenient control.
[0062] In this embodiment, as a preferred design, refer to Figure 1 , Figure 6 and Figure 7 , the catcher driving mechanism 6 is installed on the housing 1 of the sewing machine. The housing 1 is provided with a catcher limiting groove 12. The bobbin catcher 5 includes a catcher mounting portion 52. The catcher mounting portion 52 is connected to the catcher driving mechanism 6 and is located in the catcher limiting groove 12. The groove bottom surface of the catcher limiting groove 12 constitutes a catching positioning surface 11. The catcher driving mechanism 6 drives the bobbin catcher 5 to move in the catcher limiting groove 12. The catcher limiting groove 12 plays a role in limiting and guiding to prevent the bobbin catcher 5 from deflecting. Preferably, the housing 61 is provided with a separation positioning surface for positioning the position when the bobbin catcher 5 is separated from the first thread cutter 3. When the iron core 63 drives the positioned bobbin catcher 5 to move away from the first thread cutter 3 until the catcher mounting portion 52 abuts against the separation positioning surface, the catcher mounting portion 52 stops moving to achieve accurate positioning.
[0063] In this embodiment, further, refer to Figure 1, the catching part mounting part 52 of the bottom line catching part 5 is sleeved on the iron core 63. The catching part driving mechanism 6 further includes a fastener structure for locking and fixing the catching part mounting part 52 on the iron core 63. When the fastener structure is loosened, the bottom line catching part 5 can rotate around the iron core 63. Among them, the iron core 63 has a catching part connecting section 631 and a shoulder surface 632 at one end of the catching part connecting section 631. The catching part connecting section 631 is provided with an external thread. The catching part mounting part 52 is sleeved on the catching part connecting section 631 through a through hole. The fastener structure includes a locking nut 65 screwed on the catching part connecting section 631. The locking nut 65 presses the catching part mounting part 52 against the shoulder surface 632. A counterbore 13 for accommodating the catching part connecting section 631 and the locking nut 65 is also provided on the bottom surface of the catching part limiting groove 12. During assembly, when the locking nut 65 is loosened, the bottom line catching part 5 can be adjusted to rotate on the iron core 63, which is convenient for positioning and installing the bottom line catching part 5 into the catching part limiting groove 12. After the bottom line catching part 5 is installed in place, tightening the locking nut 65 can fix the bottom line catching part 5 on the iron core 63.
[0064] In this embodiment, referring to Figure 3 , Figure 4 and Figure 7 , as a preferred design, a receiving center hole is provided in the housing 61 of the catching part driving mechanism 6. The coil 62 and the iron core 63 are both located in the receiving center hole, and a pressing plate 68 is used to fix the opening of the receiving center hole. The pressing plate 68 presses on the coil 62 to fix the coil 62 in the housing 61. The end of the iron core 63 extends out from the through hole in the middle of the pressing plate 68. The closed space formed by the pressing plate 68 and the receiving center hole should be slightly larger than the axial length of the iron core 63 in the receiving center hole, so that the iron core 63 has a certain axial movement space. A notch 613 is also provided on the hole wall of the receiving center hole. The power lead 621 of the coil 62 extends out from the notch 613 for connection to the power supply. The pressing plate 68 has a convex part specifically extending into the notch 613, and the two work together to protect the power lead 621 of the coil 62.
[0065] In this embodiment, referring to Figure 3 , Figure 4 and Figure 7 , as a preferred design, the catching part driving mechanism 6 further includes a guide bushing 66 fixed in the housing 61 and a guide rod 67 located in the guide bushing 66. The guide rod 67 is fixedly connected to the iron core 63. The material of the guide bushing 66 is preferably wear-resistant, oil-resistant and corrosion-resistant, and a copper sleeve can be specifically used. The guide rod 67 can be made of stainless steel to reduce the friction between the two. Preferably, a guide bushing 66 is also provided on the outer peripheral surface of the iron core 63 to guide the iron core 63 itself. Through the guide bushing 66 and the guide rod 67, the movement of the iron core 63 can be restricted and guided, so as to stabilize the movement of the bottom line catching part 5.
[0066] In this embodiment, referring to Figure 3 、 Figure 4 and Figure 7 , preferably, the elastic structure adopts a spring 64 sleeved on the guide rod 67, with a stable installation position. One end of the spring 64 abuts against the iron core 63, and the other end abuts against the end face of the guide bushing 66 on the outside of the guide rod 67. The guide bushing 66 can prevent the spring 64 from falling off the guide rod 67. When the iron core 63 drives the bottom thread catcher 5 to move away from the first thread cutter 3, the spring 64 is compressed, applying an axial elastic force to the iron core 63.
[0067] In this embodiment, referring to Figure 2 、 Figure 3 and Figure 6 , preferably, the housing 61 of the catcher driving mechanism 6 is provided with a housing mounting portion 611. A strip-shaped hole 612 is formed on the housing mounting portion 611. The housing mounting portion 611 is fixedly connected to the housing 1 of the sewing machine through a bolt 8. The housing 1 is provided with a housing mounting surface 15, and a threaded hole 14 is formed on the housing mounting surface 15. During installation, the housing mounting portion 611 of the housing 61 is closely attached to the housing mounting surface 15, and then the bolt 8 is passed through the strip-shaped hole 612 and screwed into the threaded hole 14, thereby positioning and installing the housing 61 on the housing mounting surface 15. Moreover, through the strip-shaped hole 612, the installation position of the housing 61 can be adjusted, facilitating assembly.
[0068] The catcher driving mechanism 6 in the present utility model is not limited to the above-mentioned driving method using the coil 62, the iron core 63 and the elastic structure, and other suitable mechanisms can also be adopted, such as pneumatic, stepper motor, electric cylinder and other driving methods.
[0069] The thread cutting mechanism of the present utility model is not only applicable to a single-blade thread cutting mechanism, but also applicable to a double-blade and large rotary hook 2 thread cutting mechanism, and can ensure that the thread cutting mechanism without a lifting portion on the first thread cutter 3 can complete the capture of the bottom thread after thread cutting.
[0070] The present utility model also provides a sewing machine, including the above-mentioned thread cutting mechanism. The catcher driving mechanism 6 of the thread cutting mechanism is controlled by the electric control system of the sewing machine. The electric control system actively controls the movement of the arc-shaped catcher 51 by controlling the on-off of the coil 62.
[0071] As can be seen from the above, the thread cutting mechanism and the sewing machine of the present utility model have the following beneficial effects:
[0072] 1. By setting the catcher driving mechanism 6, the bottom thread catcher 5 is changed from a passive action to an active action, which can actively drive the arc-shaped catcher 51 to separate from the first thread cutter 3 before thread cutting, avoiding the downward pressing action of the second thread cutter 4 on the arc-shaped catcher 51, effectively reducing wear and collision problems, and ensuring that the second thread cutter 4 can smoothly enter between the arc-shaped catcher 51 and the first thread cutter 3.
[0073] 2. The catcher driving mechanism 6 controls the energization of the control coil 62 and uses the iron core 63 to drive the bottom thread catcher 5 to move, which is convenient to control and has a simple structure.
[0074] 3. The thread cutting mechanism can maintain the position of the bottom thread end, fix it in a small area, and ensure that during starting sewing, the top thread loop can accurately catch the bottom thread end, having a good starting sewing thread feeding rate. During starting sewing, the caught bottom thread end is released to ensure that the bottom thread bird's nest will not become larger.
[0075] In summary, the utility model effectively overcomes various disadvantages in the prior art and has high industrial utilization value.
[0076] The above embodiments are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the utility model should still be covered by the claims of the utility model.
Claims
1. A thread cutting mechanism for a sewing machine, which is used to be arranged at the bobbin case (2) of the sewing machine for thread cutting. The thread cutting mechanism includes a first thread cutting knife (3), a second thread cutting knife (4) and a bobbin thread catcher (5). The first thread cutting knife (3) is fixedly installed on the outer peripheral side of the bobbin case (2). The second thread cutting knife (4) is arranged on the outer peripheral side of the bobbin case (2) and can rotate around the bobbin case (2) to engage or separate from the first thread cutting knife (3). A thread cutting hook for driving the bobbin thread to move towards the first thread cutting knife (3) is provided on the second thread cutting knife (4). The bobbin thread catcher (5) includes an arc-shaped catching piece (51) arranged along the outer peripheral side of the bobbin case (2). A first catching part is provided on the side surface of the first thread cutting knife (3) facing the bobbin case (2). A second catching part is provided on the outer arc surface of the arc-shaped catching piece (51). It is characterized in that: It further includes a catcher driving mechanism (6), which can drive the bottom thread catcher (5) to move close to the first thread cutter (3) to the catching position. When the bottom thread catcher (5) is in the catching position, the second catching part and the first catching part of the first thread cutter (3) cooperate to form a bottom thread catching structure, or drive the bottom thread catcher (5) to move to a position where the arc-shaped catching piece (51) is away from the first thread cutter (3).
2. The wire cutting mechanism according to claim 1, characterized in that: It further includes a fixedly arranged catching positioning surface (11), and the bottom thread catcher (5) is in the catching position when it moves and abuts against the catching positioning surface (11).
3. The wire cutting mechanism according to claim 1 or 2, characterized in that: The catcher driving mechanism (6) includes a housing (61), a coil (62), an iron core (63) and an elastic structure. The housing (61) is fixedly installed in the sewing machine. The coil (62) is installed in the housing (61). The iron core (63) is arranged in the coil (62). The bottom thread catcher (5) is installed on the iron core (63). When the coil (62) is energized, the iron core (63) drives the bottom thread catcher (5) to move to a position where the arc-shaped catching piece (51) is away from the first thread cutter (3). The elastic force of the elastic structure can drive the bottom thread catcher (5) to move towards the catching position, and when the coil (62) is not energized, the elastic structure can keep the bottom thread catcher (5) in the catching position.
4. The wire cutting mechanism according to claim 3, characterized in that: The catcher driving mechanism (6) is installed on the housing (1) of the sewing machine. The housing (1) is provided with a catcher limiting groove (12). The bottom thread catcher (5) includes a catcher mounting part (52). The catcher mounting part (52) is connected to the catcher driving mechanism (6) and is located in the catcher limiting groove (12).
5. The wire cutting mechanism according to claim 4, characterized in that: The catcher mounting part (52) of the bottom thread catcher (5) is sleeved on the iron core (63). The catcher driving mechanism (6) further includes a fastener structure for locking and fixing the catcher mounting part (52) on the iron core (63). When the fastener structure is loosened, the bottom thread catcher (5) can rotate around the iron core (63).
6. The wire cutting mechanism according to claim 5, wherein: The iron core (63) has a catcher connection section (631) and a shoulder surface (632) at one end of the catcher connection section (631). The catcher connection section (631) is provided with an external thread. The catcher mounting part (52) is sleeved on the catcher connection section (631) through a through hole. The fastener structure includes a locking nut (65) screwed on the catcher connection section (631). The locking nut (65) presses the catcher mounting part (52) against the shoulder surface (632).
7. The wire cutting mechanism according to claim 3, characterized in that: A receiving center hole is formed in the housing (61). The coil (62) and the iron core (63) are both located in the receiving center hole. A notch (613) is further provided on the hole wall of the receiving center hole. The power lead (621) of the coil (62) extends out from the notch (613).
8. The wire cutting mechanism according to claim 3, wherein: The catcher driving mechanism (6) further includes a guide bushing (66) fixed in the housing (61) and a guide rod (67) located in the guide bushing (66). The guide rod (67) is fixedly connected to the iron core (63).
9. The wire cutting mechanism according to claim 3, wherein: The housing (61) of the catching member driving mechanism (6) is provided with a housing mounting portion (611). A strip-shaped hole (612) is formed in the housing mounting portion (611). The housing mounting portion (611) is fixedly connected to the machine housing (1) of the sewing machine by bolts (8), and the bolts (8) are located in the strip-shaped hole (612).
10. A sewing machine, characterized in that: Comprising a thread cutting mechanism according to any one of claims 1 to 9.