Thread hooking device of sewing machine and sewing machine

Abstract

The invention relates to the technical field of sewing, in particular to a thread hooking device of a sewing machine and the sewing machine. A thread hooking device of a sewing machine comprises a machine shell, a main shaft, a first eccentric part, a connecting rod part and a thread hooking assembly, and the main shaft extends in the first direction and is rotationally installed on the machine shell; the first eccentric part is eccentrically connected with the main shaft and can rotate along with the main shaft; one end of the connecting rod piece forms an annular connecting part, and the annular connecting part is arranged outside the first eccentric piece in a sleeving mode and is in transmission connection with the first eccentric piece; the thread hooking assembly is rotationally installed on the machine shell, the thread hooking assembly is connected with the end, away from the first eccentric piece, of the connecting rod piece and can be driven by the connecting rod piece to move, the thread hooking assembly comprises a thread hooking piece, and when the curved needle retracts from the far stop point, the thread hooking piece swings towards the side close to the curved needle so as to hook the bottom thread located on the curved needle. The amount of bottom threads can be increased, and therefore the stretching requirement of the high-elastic fabric is met.

Description

Technical Field

[0001] This application relates to the field of sewing technology, and in particular to a thread hooking device for a sewing machine and a sewing machine. Background Technology

[0002] Sewing machines, widely used for sewing knitted and elastic fabrics, typically employ a chain-like stitch structure formed by interlocking top and bottom threads. When sewing highly elastic fabrics (such as yoga wear and sportswear), the fabric itself needs to withstand significant repeated stretching. This requires the chain-like stitch to possess not only sufficient strength but also excellent extensibility to match the fabric's tensile limits and prevent thread breakage or seam opening during wear or use.

[0003] Normally, a sewing machine uses a needle to pierce the fabric with the top thread, forming a loop as it returns to its starting position. Then, the looper moves forward, its tip precisely piercing this loop, simultaneously introducing the bobbin thread it carries. After hooking the thread, the loop returns to its starting position. During this process, the stitching cam rotates to tighten the bobbin thread. However, because the needle re-pierces the fabric (to secure the loop) at a later time, the thread supply is insufficient when sewing fabrics with high stretch (such as yoga wear). This results in the chain stitch not reaching the stretch limit of super-elastic fabrics, failing to meet the stretching requirements of highly elastic materials. Summary of the Invention

[0004] Therefore, it is necessary to provide a sewing machine with a thread hooking device and a sewing machine that can solve the above problems.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A thread hooking device for a sewing machine for hooking the thread thread on a looper of the sewing machine, the looper running in a first direction and having a distal stop point, the thread hooking device of the sewing machine comprising:

[0007] chassis;

[0008] The main shaft extends along a first direction and is rotatably mounted on the housing;

[0009] The first eccentric component is eccentrically connected to the main shaft and can rotate with the main shaft;

[0010] A connecting rod has an annular connecting portion at one end, which is sleeved on the outside of the first eccentric member and connected to the first eccentric member in a transmission manner.

[0011] A hook assembly is rotatably mounted on the housing. The hook assembly is connected to the end of the connecting rod away from the first eccentric member and can move under the drive of the connecting rod. The hook assembly includes a hook member. When the bent needle retracts from the far end point, the hook member swings toward the side closer to the bent needle to hook the bottom line located on the bent needle.

[0012] Understandably, this application, by setting a first eccentric member, a connecting rod, and a hook assembly, enables the connecting rod to be drivenly connected to the first eccentric member and rotatably connected to the hook assembly. When the first eccentric member rotates with the main shaft, the connecting rod can swing in a second direction and drive the hook assembly to rotate, thereby causing the hook assembly to swing and hook the bottom thread. The transmission of the first eccentric member and the connecting rod allows the hook assembly to swing with the rotation of the main shaft, enabling the hook assembly to be linked with the main shaft and perform a stable hooking action, increasing the amount of bottom thread and thus meeting the stretching requirements of high-elasticity fabrics.

[0013] In one embodiment, the hook assembly includes a transmission component and a rotating shaft component. One end of the transmission component is connected to the end of the connecting rod component facing the bent needle, and the other end is connected to one end of the rotating shaft component. The end of the rotating shaft component away from the transmission component is connected to the hook component and drives the hook component to swing.

[0014] It is understandable that by setting up transmission components and rotating shafts, the oscillation of the connecting rod in a plane can be converted into the rotational motion of the rotating shaft, thereby realizing the conversion and transmission of motion forms. This makes the power transmission path clearer and also makes the overall structure more compact and easier to arrange inside the sewing machine.

[0015] In one embodiment, the rotating shaft component includes a rotating shaft, the transmission component includes a transmission sleeve, the rotating shaft is rotatably connected to the housing and extends along a first direction, the transmission sleeve is sleeved outside the rotating shaft and can be circumferentially limited with the rotating shaft;

[0016] The transmission sleeve has a connecting part formed on the side near the main shaft, and the connecting part is rotatably connected to the connecting rod.

[0017] In one embodiment, the rotating shaft further includes a bushing, which is sleeved on the rotating shaft and rotatably connected to the rotating shaft, and the bushing is disposed between the rotating shaft and the housing.

[0018] Understandably, by setting a bushing between the shaft and the housing, it can serve as a support bearing for the shaft, reducing frictional resistance during shaft rotation, thereby ensuring smooth and flexible shaft rotation, improving transmission efficiency, reducing wear under long-term use, and extending the service life of the shaft.

[0019] In one embodiment, the hook assembly further includes a hook arm fixed to one end of the pivot member away from the transmission member and extending radially toward the direction of the bend needle, wherein the hook member is connected to the end of the hook arm extending toward the direction of the bend needle.

[0020] Understandably, by setting up a hook arm, the lever principle is used to amplify the displacement of the hook component end corresponding to the rotation angle of the shaft, thereby obtaining a larger hooking stroke without increasing the shaft rotation angle, increasing the effective working range of the hooking action, and improving the reliability and stability of the hooking.

[0021] In one embodiment, the hooking element is configured as a hooking paddle with a hook portion for hooking the bottom line.

[0022] This application also provides the following technical solutions:

[0023] A sewing machine includes a looper device and a thread hook device as described in any of the above embodiments.

[0024] In one embodiment, the sewing machine further includes a drive unit disposed in the housing and connected to the main shaft for transmission, and capable of driving the main shaft to rotate.

[0025] In one embodiment, the looper device includes a looper frame, a looper rod, a looper, and a transmission assembly. The looper frame is disposed on the machine housing and extends along a first direction. The looper rod extends along the first direction and passes through the looper frame, and is capable of moving back and forth along the first direction. The looper is disposed at one end of the looper rod near the thread hook of the sewing machine. One end of the transmission assembly is eccentrically connected to the main shaft, and the other end is connected to the looper rod, and is capable of driving the looper rod to move back and forth along the first direction under the drive of the main shaft.

[0026] Understandably, by setting up a bending needle device connected to the main shaft drive, since the bending needle device and the hooking device are both driven by the main shaft, the bending needle device and the hooking device can move synchronously, thereby ensuring that the hooking device can hook the line when the bending needle retracts, and ensuring the accuracy of the hooking action of the hooking device.

[0027] In one embodiment, the transmission assembly includes a second eccentric member, the phase angle difference between the second eccentric member and the first eccentric member being φ, where 60°≥φ≥20°.

[0028] Compared with existing technologies, the thread hooking device of the sewing machine is equipped with a first eccentric member, a connecting rod, and a thread hooking assembly. The connecting rod is drivenly connected to the first eccentric member and rotatably connected to the thread hooking assembly. When the first eccentric member rotates with the main shaft, the connecting rod can swing in a second direction and drive the thread hooking assembly to rotate, thereby causing the thread hooking member to swing and hook the bobbin thread. By utilizing the transmission of the first eccentric member and the connecting rod, the thread hooking member can swing with the rotation of the main shaft, enabling the thread hooking member to be linked with the main shaft and perform a stable thread hooking action, which can increase the amount of bobbin thread and thus meet the stretching requirements of high-elasticity fabrics. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the needle bending device and thread hooking device of the sewing machine provided in this application from one perspective.

[0031] Figure 2 This is a structural schematic diagram of the needle looper and thread hooking device of the sewing machine provided in this application from another perspective.

[0032] Figure 3 Provided for this application Figure 2 Enlarged view of point A in the middle.

[0033] Figure 4 An exploded view from one perspective of the needle bending device and thread hooking device of the sewing machine provided in this application.

[0034] Figure 5 An exploded view from another perspective of the needle looper and thread hooking device of the sewing machine provided in this application.

[0035] Figure 6 The timing and phase relationship diagram for the first eccentric component is shown.

[0036] Figure 7 The timing and phase relationship diagram for the second eccentric component is shown.

[0037] The component labels are as follows:

[0038] 100. Hooking device; 20. Main shaft; 30. First eccentric component; 31. Eccentric wheel; 40. Connecting rod; 41. Annular connecting part; 50. Hooking assembly; 51. Hooking component; 511. Hooking lever; 512. Hooking needle part; 52. Transmission component; 521. Transmission sleeve; 522. Connecting part; 523. Locking part; 524. Locking component; 53. Rotating shaft component; 531. Rotating shaft; 532. Bushing; 54. Hooking swing arm; 541. Fixing screw; 542. Limiting groove;

[0039] 200. Sewing machine; 201. Needle looper; 202. Needle looper frame; 203. Needle looper rod; 204. Needle looper; 205. Transmission assembly; 206. Second eccentric component; 207. Thread loop; 208. Borehole. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0045] Please see Figures 1 to 7 This application provides a thread hooking device 100 for a sewing machine 200. The thread hooking device 100 is disposed on the sewing machine 200. When the needle of the sewing machine 200 passes through the fabric, it forms a thread loop 207. The curved needle 204 located below the fabric has a bottom thread 208. When the curved needle 204 passes through the thread loop 207 and retracts, the thread hooking device 100 of the sewing machine 200 is used to hook the bottom thread 208.

[0046] Specifically, the hooking device 100 includes a housing (not shown), a main shaft 20, a first eccentric member 30, a connecting rod 40, and a hooking assembly 50. The main shaft 20 extends along a first direction x and is rotatably mounted on the housing. The first eccentric member 30 is eccentrically connected to the main shaft 20 and can rotate with the main shaft 20. One end of the connecting rod 40 forms an annular connecting portion 41, which is sleeved on the outside of the first eccentric member 30 and is drively connected to the first eccentric member 30. The hooking assembly 50 is rotatably mounted on the housing. The hooking assembly 50 is connected to the end of the connecting rod 40 away from the first eccentric member 30 and can move under the drive of the connecting rod 40. The hooking assembly 50 includes a hooking member 51. When the bent needle 204 retracts from the far end point, the hooking member 51 swings toward the side closer to the bent needle 204 to hook the bottom line 208 located on the bent needle 204.

[0047] In the prior art, when the stitching cam rotates to tighten the bobbin 208, the timing of needle insertion (i.e., the needle piercing the fabric again to fix the thread loop 207) is relatively late, resulting in insufficient thread supply when sewing fabrics with high stretch (such as yoga clothes). On the one hand, the thread loop 207 may clump together due to the lack of bobbin 208, causing bulges on the fabric. On the other hand, insufficient bobbin 208 will also fail to meet the stretching requirements of high-elasticity fabrics. This application sets up a first eccentric member 30, a connecting rod 40, and a hook assembly 50, so that the connecting rod 40 is connected to the first eccentric member 30 in a transmission manner and is rotatably connected to the hook assembly 50. When the first eccentric member 30 rotates with the main shaft 20, the connecting rod 40 can swing in the second direction and drive the hook assembly 50 to rotate, thereby causing the hook member 51 to swing to hook the bobbin 208. The hooking member 51 can swing with the rotation of the main shaft 20 by using the transmission of the first eccentric member 30 and the connecting rod member 40. This allows the hooking member 51 to be linked with the main shaft 20 and perform a stable hooking action, which can increase the amount of thread in the bottom thread 208. This not only avoids the problem of fabric bulging caused by the gathering of the thread loop 207, but also meets the stretching requirements of high elastic fabric.

[0048] like Figures 1 to 5 As shown, the first eccentric member 30 is configured as an eccentric wheel 31. One end of the connecting rod 40 forms an annular connecting portion 41 and is sleeved on the eccentric wheel 31, and can swing with the rotation of the eccentric wheel 31. The eccentric wheel 31 can be limited to the main shaft 20 by a convex-concave fit or by using screws, clips, etc., so that the eccentric wheel 31 can rotate together with the main shaft 20. A sliding bearing bushing or needle roller bearing can also be provided between the annular connecting portion 41 and the eccentric wheel 31 to make the movement of the connecting rod 40 smoother, reduce the wear of the connecting rod 40, and improve the service life of the connecting rod 40.

[0049] Furthermore, retaining rings are provided on both sides of the annular connecting part 41 of the connecting rod 40 so that the connecting rod 40 will not move relative to the main shaft 20 in the first direction x, which can ensure that the connecting rod 40 will not deviate, thereby accurately transmitting the rotation of the eccentric wheel 31 to the hook assembly 50.

[0050] In other embodiments, the first eccentric member 30 and the connecting rod member 40 can also be replaced by structures such as crank and connecting rod, worm gear and worm, which are common in the prior art and will not be described in detail here.

[0051] like Figures 2 to 5As shown, the hook assembly 50 includes a transmission component 52 and a rotating shaft component 53. One end of the transmission component 52 is connected to the end of the connecting rod 40 facing the bent needle 204, and the other end is connected to one end of the rotating shaft component 53. The end of the rotating shaft component 53 away from the transmission component 52 is connected to the hook component 51, driving the hook component 51 to swing. Thus, by setting the transmission component 52 and the rotating shaft component 53, the swinging motion of the connecting rod 40 in one plane can be converted into the rotational motion of the rotating shaft component 53, thereby realizing the conversion and transmission of motion forms. This makes the power transmission path clearer and also makes the overall structure more compact and easier to arrange inside the sewing machine 200. Here, the transmission component 52 and the rotating shaft component 53 can be set separately or integrally molded to reduce the number of parts, facilitate the assembly of the hook device 100, and improve assembly efficiency.

[0052] In one embodiment, the rotating shaft 53 includes a rotating shaft 531, and the transmission component 52 includes a transmission sleeve 521. The rotating shaft 531 is rotatably connected to the housing and extends along a first direction x. The transmission sleeve 521 is sleeved on the rotating shaft 531 and can be circumferentially limited with the rotating shaft 531. A connecting portion 522 is formed on the side of the transmission sleeve 521 near the main shaft 20, and the connecting portion 522 is rotatably connected to the connecting rod 40. Here, the connecting portion 522 and the connecting rod 40 can be rotatably connected by means of a pin, universal joint, bearing, etc.

[0053] In this embodiment, the transmission sleeve 521 is sleeved on the outside of the rotating shaft 531, and its circumferential surface is broken along the axis to form two locking portions 523 on both sides of the break. By providing a locking member 524 to cooperate with the two locking portions 523, the transmission sleeve 521 and the rotating shaft 531 can be tightly fitted, thereby limiting the circumferential positioning of the transmission sleeve 521 and the rotating shaft 531. Here, the locking portion 523 can be configured as a threaded hole, and the locking member 524 can be configured as a bolt.

[0054] In other embodiments, the transmission sleeve 521 and the rotating shaft 531 can also be connected by means of a convex-concave fit or direct fixing with screws to achieve circumferential limiting.

[0055] like Figure 3 and Figure 5 As shown, the rotating shaft component 53 also includes a bushing 532, which is sleeved on the rotating shaft 531 and rotatably connected to it. The bushing 532 is positioned between the rotating shaft 531 and the housing. Thus, by providing the bushing 532 between the rotating shaft 531 and the housing, it acts as a support bearing for the rotating shaft 531, reducing frictional resistance during rotation. This ensures smooth and flexible rotation of the rotating shaft 531, improves transmission efficiency, reduces wear during long-term use, and extends the service life of the rotating shaft 531.

[0056] In one embodiment, the hook assembly 50 further includes a hook arm 54, which is fixed to the end of the rotating shaft 53 away from the transmission member 52 and extends radially toward the direction of the bent needle 204. The hook member 51 is connected to the end of the hook arm 54 extending toward the direction of the bent needle 204. Thus, by providing the hook arm 54, the displacement of the end of the hook member 51 corresponding to the rotation angle of the rotating shaft 531 is amplified using the lever principle, thereby obtaining a larger hooking stroke without increasing the rotation angle of the rotating shaft 531, increasing the effective working range of the hooking action, and improving the reliability and stability of the hooking. Here, the hook arm 54 can be manufactured separately from the rotating shaft 531 or integrally with the rotating shaft 531 to reduce the number of parts, facilitate the assembly of the hook device 100, and improve assembly efficiency.

[0057] In one embodiment, the hooking member 51 is configured as a hooking lever 511, which has a hook portion 512 for hooking the bottom thread 208. Here, when the hook portion 512 hooks the bottom thread 208, its cross-sectional area gradually decreases along the direction close to the bottom thread 208, and its shape is needle-like, making it easier to insert into the loop 207 formed by the bottom thread 208, thereby facilitating the hooking of the bottom thread 208. The hooking lever 511 can be fixed to the hooking arm 54 by means of screw connection, snap connection, interference fit, etc., or it can be integrally formed with the hooking arm 54.

[0058] In this embodiment, the hook assembly 50 further includes a fixing screw 541, a limiting groove 542 is formed on the hook arm 54, and the hook lever 511 is partially accommodated in the limiting groove 542. The fixing screw 541 is perpendicular to the hook lever 511 and passes through the hook arm 54 and the hook lever 511, and is used to fix the hook lever 511 to the hook arm 54.

[0059] like Figures 1 to 5 As shown, this application also provides the following technical solutions:

[0060] A sewing machine 200 includes a needle, a looper device 201, and a thread hook device 100 as described in any of the above embodiments. A thread is attached to the needle, and when the needle retracts after passing through the fabric, it forms a loop 207.

[0061] In one embodiment, the sewing machine 200 further includes a drive unit, which is disposed in the machine housing and connected to the main shaft 20 for transmission, and is capable of driving the main shaft 20 to rotate. Here, the drive unit can be configured as a stepper motor, servo motor, or other structure. The drive unit and the main shaft 20 can be connected by means of gear connection, key connection, or other methods to enable the main shaft 20 to rotate when the drive unit is started.

[0062] like Figure 2 and Figure 5As shown, the needle bending device 201 includes a needle bending frame 202, a needle bending rod 203, a needle bending 204, and a transmission assembly 205. The needle bending frame 202 is disposed on the machine housing and extends along the first direction x. The needle bending rod 203 extends along the first direction x and passes through the needle bending frame 202, and can move back and forth along the first direction x. The needle bending 204 is disposed at one end of the needle bending rod 203 near the hooking device 100. One end of the transmission assembly 205 is eccentrically connected to the main shaft 20, and the other end is connected to the needle bending rod 203, and can drive the needle bending rod 203 to move back and forth along the first direction x under the drive of the main shaft 20. Thus, by setting up a needle bending device 201 that is connected to the main shaft 20 for transmission, since the needle bending device 201 and the hooking device 100 are both driven by the main shaft 20, the needle bending device 201 and the hooking device 100 can move synchronously, thereby ensuring that the hooking component 51 can hook the line when the needle bending 204 retracts, and ensuring the accuracy of the hooking action of the hooking device 100. Here, the specific structure of the transmission component 205 is quite common in the prior art and will not be described in detail.

[0063] In one embodiment, the transmission assembly 205 includes a second eccentric member 206, the phase angle difference between the second eccentric member 206 and the first eccentric member 30 being φ, where 60°≥φ≥20°. Specifically, the structure of the second eccentric member 206 can be referred to that of the first eccentric member 30, and will not be described in detail here.

[0064] Here, the phase angle difference φ between the second eccentric member 206 and the first eccentric member 30 can be selected as φ=20°, φ=30°, φ=40°, φ=50°, φ=60°, etc. The user can select the corresponding value of the phase angle difference φ between the second eccentric member 206 and the first eccentric member 30 according to the structure of different hooking devices 100 and bending needle devices 201.

[0065] like Figure 6 and Figure 7 As shown, the timing and phase relationship of two key moving parts during the rotation of the main shaft 20 of the sewing machine 200 is illustrated, representing the motion law of the first eccentric part 30 and the second eccentric part 206. Figure 6 The linear displacement of the first eccentric member 30 representing the drive hook assembly 50 exhibits a standard sine or near-sine wave characteristic, corresponding to the "hooking-resetting" reciprocating motion of the hook assembly 50. Figure 7 The linear displacement of the second eccentric component 206 representing the driving bend needle 204 exhibits a standard sine or near-sine wave characteristic, corresponding to the "forward-backward" reciprocating motion of the bend needle 204.

[0066] The specific operating steps of the looper device 201 and the thread hook device 100 of the sewing machine 200 in this application are as follows:

[0067] 1. The sewing machine 200 has a top thread connected to its needle. When the needle is lifted after passing through the fabric, the top thread forms multiple loops 207 (usually 3 loops 207) spaced apart along the first direction x below the fabric. The sewing machine 200 has a bobbin thread 208 connected to its loop 204. The loop 204 moves along the first direction x of the loops 207 and passes through the loops 207 under the drive of the main shaft 20 and the transmission assembly 205.

[0068] 2. After the bend needle 204 reaches the far end point, it moves in the opposite direction. The bottom thread 208 forms a loop at the far end point. During this process, the hooking part 51 swings under the drive of the main shaft 20 and the transmission of the first eccentric part 30, the connecting rod part 40, the transmission part 52, and the rotating shaft part 53. When the bottom thread 208 loop 207 is formed, the hooking part of the hooking part 51 hooks the bottom thread 208. When the wire-beating cam takes up the line, the hooking part 51 can reduce the amount of line taken up by the wire-beating cam, thereby increasing the amount of line in the bottom thread 208.

[0069] 3. The needle descends again to perform the "back-insertion" action: the needle passes through the fabric and accurately inserts into the knot formed by the bobbin 208 and loop 207. The back-insertion action fixes the loop 207 formed in the previous cycle and interlocks with the bobbin 208, ultimately forming a chain stitch with higher elongation potential on the fabric. Subsequently, the needle rises, the looper 204 and the hook 51 return to their original positions, and the stitching cam tightens the excess stitch, completing this stitch formation cycle. All components then work together to enter the next working cycle.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A thread hooking device for a sewing machine for hooking a thread bobbin (208) on a looper (204) of a sewing machine (200), the looper (204) running in a first direction and having a distal end, characterized in that, The thread hook device (100) of the sewing machine (200) includes: chassis; A main shaft (20) extends along a first direction and is rotatably mounted on the housing; The first eccentric component (30) is eccentrically connected to the main shaft (20) and can rotate with the main shaft (20); The connecting rod (40) has an annular connecting part (41) at one end. The annular connecting part (41) is sleeved on the outside of the first eccentric member (30) and is connected to the first eccentric member (30) in a transmission manner. The hook assembly (50) is rotatably mounted on the housing. The hook assembly (50) is connected to the end of the connecting rod (40) away from the first eccentric member (30) and can move under the drive of the connecting rod (40). The hook assembly (50) includes a hook member (51). When the bent needle (204) retracts from the far end point, the hook member (51) swings toward the side close to the bent needle (204) to hook the bottom line (208) located on the bent needle (204).

2. The thread hooking device of the sewing machine according to claim 1, characterized in that, The hook assembly (50) includes a transmission component (52) and a rotating shaft component (53). One end of the transmission component (52) is connected to the end of the connecting rod component (40) facing the bent needle (204), and the other end is connected to one end of the rotating shaft component (53). The end of the rotating shaft component (53) away from the transmission component (52) is connected to the hook component (51) and drives the hook component (51) to swing.

3. The thread hooking device of the sewing machine according to claim 2, characterized in that, The rotating shaft component (53) includes a rotating shaft (531), and the transmission component (52) includes a transmission sleeve (521). The rotating shaft (531) is rotatably connected to the housing and extends along a first direction. The transmission sleeve (521) is sleeved on the rotating shaft (531) and can be circumferentially limited with the rotating shaft (531). The transmission sleeve (521) has a connecting part (522) on the side near the main shaft (20), and the connecting part (522) is rotatably connected to the connecting rod (40).

4. The thread-hooking device of the sewing machine according to claim 3, characterized in that, The rotating shaft (53) also includes a bushing (532), which is sleeved on the rotating shaft (531) and rotatably connected to the rotating shaft (531). The bushing (532) is disposed between the rotating shaft (531) and the housing.

5. The thread hooking device of the sewing machine according to claim 2, characterized in that, The hook assembly (50) further includes a hook arm (54), which is fixed to one end of the pivot (53) away from the transmission member (52) and extends radially toward the direction of the bend (204) along the pivot (53). The hook member (51) is connected to the end of the hook arm (54) extending toward the direction of the bend (204).

6. The thread-hooking device of the sewing machine according to claim 1, characterized in that, The hooking member (51) is configured as a hooking paddle (511), which has a hook portion (512) for hooking the bottom line (208).

7. A sewing machine, characterized in that, It includes a bender device (201) and a hook-and-line device (100) as described in any one of claims 1-6.

8. The sewing machine according to claim 7, characterized in that, The sewing machine (200) also includes a drive unit, which is disposed in the machine housing and connected to the main shaft (20) for transmission, and is capable of driving the main shaft (20) to rotate.

9. The sewing machine according to claim 7, characterized in that, The looper device (201) includes a looper frame (202), a looper rod (203), a looper (204), and a transmission assembly (205). The looper frame (202) is disposed on the machine housing and extends along a first direction. The looper rod (203) extends along the first direction and passes through the looper frame (202), and can move back and forth along the first direction. The looper (204) is disposed at one end of the looper rod (203) near the hook device (100) of the sewing machine (200). One end of the transmission assembly (205) is eccentrically connected to the main shaft (20), and the other end is connected to the looper rod (203), and can drive the looper rod (203) to move back and forth along the first direction under the drive of the main shaft (20).

10. The sewing machine according to claim 9, characterized in that, The transmission assembly (205) includes a second eccentric member (206), and the phase angle difference between the second eccentric member (206) and the first eccentric member (30) is φ, where 60°≥φ≥20°.

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