Combined mechanism for trimming threads and adjusting feed lifting amount of lockstitch sewing machine and lockstitch sewing machine

Abstract

The utility model relates to the technical field of lockstitch sewing machines, in particular to a combined mechanism for trimming threads and adjusting feed lifting amount of a lockstitch sewing machine and the lockstitch sewing machine. Comprising a thread trimming mechanism, a feed lifting amount adjusting mechanism and a first driving motor, and the first driving motor drives the thread trimming mechanism and the feed lifting amount adjusting mechanism; a rotating area of a motor shaft of the driving motor I can be at least divided into a thread trimming area and a feed lifting amount adjusting area; when the motor shaft rotates in the thread trimming area, the thread trimming mechanism executes a thread trimming action, and the feed lifting amount adjusting mechanism does not execute effective feed rack height adjustment; when the motor shaft rotates in the feed lifting amount adjusting area, the feed lifting amount adjusting mechanism adjusts the effective height of the feed rack, and the thread trimming mechanism does not execute the thread trimming action; the feed lifting amount adjusting mechanism comprises a feed lifting assembly, a feed lifting amount adjusting assembly and a feed lifting amount adjusting assembly, the combined assembly is simultaneously connected with the feed lifting assembly, the driving motor I and the upper shaft; the upper shaft transmits power to the feed lifting assembly through the combined assembly, and the first driving motor adjusts the transmission amplitude between the upper shaft and the feed lifting assembly through the combined assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of lockstitch sewing machines, in particular to a combined mechanism for thread trimming and adjusting tooth lifting amount of a lockstitch sewing machine and the lockstitch sewing machine. Background Art

[0002] In the process of sewing fabrics by sewing machines, multiple different mechanisms such as the presser foot lifting mechanism, thread trimming mechanism, thread hooking mechanism and feeding mechanism need to work together. In today's industrial production, sewing machines are usually driven by servo motors to improve the processing efficiency and controllability of sewing machines. Due to the size of the sewing machine shell, in order to improve the coordination of the movements of various mechanisms inside the sewing machine, a single motor is usually used inside the sewing machine to drive several mechanisms at the same time to make better use of the space inside the sewing machine and improve the stability of the sewing machine in working state.

[0003] When a sewing action is completed, the sewing thread will be cut in time through the thread trimming action to ensure that the next sewing action can be performed stably. During the operation of the industrial sewing machine, after the thread trimming mechanism completes the thread trimming, the feed dog will drive the fabric to move so that the needle bar can drive the sewing thread to continue sewing at the unsewn position on the fabric.

[0004] The current technology has the following shortcomings:

[0005] In the existing technology, sewing machines are generally unable to control the raising and lowering of the feed dog in real time; if a separate motor is configured to control the feed dog, the structure of the sewing machine will become complicated, which is not conducive to production. Utility Model Content

[0006] The utility model aims to provide a combined mechanism for thread trimming and adjusting the tooth lifting amount of a lockstitch sewing machine and the lockstitch sewing machine, which can realize the thread trimming action and the tooth lifting action at the same time.

[0007] The purpose of this utility model is achieved in this way:

[0008] A combined mechanism for thread trimming and adjusting the amount of thread lifting of a lockstitch sewing machine, comprising:

[0009] A thread cutting mechanism, which is used to cut the sewing thread;

[0010] A tooth lifting adjustment mechanism, which is used to control the height to which the tooth frame is lifted;

[0011] A driving motor 1 drives the thread trimming mechanism and the tooth lifting amount adjustment mechanism; the rotation area of ​​the motor shaft of the driving motor 1 can be divided into at least a thread trimming area and a tooth lifting amount adjustment area; when the motor shaft rotates in the thread trimming area, the thread trimming mechanism performs a thread trimming action, and the tooth lifting amount adjustment mechanism does not perform an effective tooth frame height adjustment; when the motor shaft rotates in the tooth lifting amount adjustment area, the tooth lifting amount adjustment mechanism adjusts the effective height of the tooth frame, and the thread trimming mechanism does not perform a thread trimming action;

[0012] Wherein, the tooth lifting amount adjustment mechanism comprises:

[0013] A tooth lifting assembly connected to one end of the tooth frame, the tooth lifting assembly is used to change the height of the tooth frame; a feed tooth is installed on the tooth frame;

[0014] A combined component simultaneously connects the tooth lifting component, a driving motor 1 and an upper shaft; the upper shaft transmits power to the tooth lifting component through the combined component, and the driving motor 1 adjusts the transmission amplitude between the upper shaft and the tooth lifting component through the combined component.

[0015] Preferably, the driving motor 1 is a dual-shaft motor, the first motor shaft of which drives the combined component, and the second motor shaft of which drives the thread trimming mechanism;

[0016] The thread trimming mechanism comprises:

[0017] A second crank, which is sleeved on the second motor shaft, and a roller is provided on the second crank;

[0018] a second cam, the roller abutting against an inner surface of the second cam;

[0019] a thread trimmer connecting rod connected to the second cam, and capable of driving the thread trimmer connecting rod to rotate when the second cam rotates;

[0020] The thread trimming connecting rod is connected to the thread trimming crank, and the thread trimming crank is provided with a thread trimmer; when the thread trimming connecting rod rotates, the thread trimmer crank drives the thread trimmer to move and cut the sewing thread;

[0021] The thread trimmer crank and the thread trimmer are connected via a connecting piece 1, and the connecting piece 1 is formed with a through hole 1, so that the connecting piece 1 can be sleeved on the end of the shuttle wheel of the rotary hook assembly and can drive the shuttle wheel to rotate;

[0022] The combined components include:

[0023] The swing seat is connected to the first motor shaft of the driving motor 1 through the transmission assembly 1, so that the driving motor 1 can drive the swing seat to swing within a set angle; the swing seat is connected to the tooth lifting assembly through a driving crank to drive the tooth lifting assembly to control the height of the feed dog;

[0024] An eccentric connecting rod assembly, one end of which is connected to the swing seat so that the swing seat can be connected to the upper shaft;

[0025] Transmission assembly 2, the two ends of which are respectively arranged on the upper shaft and the rotary hook shaft, so that the swing seat can be connected to the rotary hook shaft;

[0026] The shuttle wheel is arranged on the rotating shuttle shaft so that the shuttle wheel can be driven by the rotating shuttle shaft.

[0027] Preferably, the combined component comprises:

[0028] The swing seat is connected to the first motor shaft of the driving motor 1 through the transmission assembly 1, so that the driving motor 1 can drive the swing seat to swing within a set angle; the swing seat is connected to the tooth lifting assembly through a driving crank to drive the tooth lifting assembly to control the height of the feed dog;

[0029] An eccentric connecting rod assembly has one end connected to the swing seat, so that the swing seat is connected to the upper shaft.

[0030] Preferably, a first support shaft and a second support shaft are respectively provided on both sides of the swing seat, and the first support shaft is connected to the transmission assembly 1; the first support shaft and the second support shaft are provided on the same axis and extend into the two sides of the swing seat respectively;

[0031] The specific structure between the first support shaft and the swing seat is: a circular hole is provided on one side of the swing seat, and the end of the first support shaft extends into the circular hole and supports the swing seat; the swing seat and the first support shaft do not directly transmit power; a second toggle member is installed on the first support shaft, and a second slide groove for setting a toggle pin is provided on the second toggle member, and a toggle pin is provided on one side of the front part of the swing seat, and the toggle pin is inserted into the second slide groove, so that the swing seat can swing synchronously with the second toggle member.

[0032] Preferably, the transmission assembly 1 comprises:

[0033] A first crank connected to the first motor shaft, wherein a slider is disposed at one end of the first crank;

[0034] A first toggle member, which is provided with a first sliding groove, and the slider can slide in the first sliding groove;

[0035] The first toggle member and the first crank are respectively fixed on the first support shaft or the first motor shaft;

[0036] A second toggle member is also provided on the first support shaft, and a second slide groove for setting a toggle pin is provided on the second toggle member. The toggle pin can be inserted into the swing seat and the second slide groove, so that the swing seat can swing synchronously with the second toggle member.

[0037] Preferably, the swing seat is U-shaped, and a first connecting member is hinged on both side walls on the inner side of the front portion of the swing seat, the other end of the first connecting member is coaxially hinged with the second connecting member and the lower end of the eccentric connecting rod assembly, and the other end of the second connecting member is hinged with the movable end of the driving crank;

[0038] The upper end of the eccentric connecting rod assembly is sleeved on the upper shaft and receives the power;

[0039] The driving crank is fixedly mounted on the tooth lifting shaft and drives the tooth lifting shaft to reciprocate.

[0040] A flat sewing machine, comprising a combined mechanism for trimming and adjusting the amount of thread lifting of the flat sewing machine as described above, and also comprising

[0041] A feeding assembly connected to the other end of the tooth frame, the feeding assembly is used to drive the tooth frame to swing back and forth in the horizontal direction; the tooth lifting assembly and the feeding assembly cooperate to drive the feed tooth to complete the feeding action;

[0042] The feeding assembly comprises:

[0043] A tooth frame seat, the lower end of which is formed into a clamping sleeve, the tooth frame is hinged at the upper end of the tooth frame seat, and the tooth frame seat is used to drive the tooth frame to swing back and forth;

[0044] A shaft rod is inserted into the clamping sleeve and locked to the outside of the shaft rod by the clamping sleeve. The axial position and angular position of the tooth holder seat on the shaft rod can be adjusted by loosening the clamping sleeve.

[0045] A tooth frame crank, one end of which is sleeved on the shaft and is used to drive the shaft to rotate;

[0046] A feeding crank, which is used to connect to the second driving motor, and the feeding crank is connected to the tooth frame crank through a feeding connecting rod;

[0047] The tooth lifting assembly includes a tooth lifting crank, which is connected to the other end of the tooth frame and is used to drive the tooth frame to move up and down.

[0048] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0049] The combined assembly is connected to the tooth lifting assembly and the upper shaft through a driving crank and an eccentric connecting rod assembly respectively, so that the drive motor three can drive the tooth lifting assembly to perform the tooth lifting action through the combined assembly; and the drive motor one in the present technical solution is a dual-axis motor, a motor shaft at one end of which is connected to the thread cutting mechanism, and a motor shaft at the other end is connected to the combined assembly, so that the drive motor one and the drive motor three can be connected through the combined assembly, and the transmission amplitude between the upper shaft, the tooth lifting assembly and the thread cutting mechanism can be adjusted accordingly to realize the thread cutting action and the tooth lifting action. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the utility model.

[0051] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0052] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0053] Figure 4 It is a schematic diagram of a drive motor 1 of the utility model and a transmission structure on its motor shaft.

[0054] Figure 5 It is a schematic diagram of the cooperation between the second crank and the second cam of the utility model.

[0055] Figure 6 It is a structural schematic diagram of the thread trimming mechanism of the utility model.

[0056] Figure 7 This is an exploded view of the rotary hook assembly, connector and thread trimmer connecting rod of the utility model.

[0057] Figure 8 It is a side view of the utility model.

[0058] Fig. 9 for Figure 1 Enlarged view of point C in the middle.

[0059] Reference numerals:

[0060] 1. Tooth rack; 11. Feeding teeth;

[0061] 2. Tooth lifting assembly; 21. Tooth lifting crank; 22. Driving crank; 23. Tooth lifting shaft;

[0062] 3. Feeding assembly; 31. Tooth frame seat; 32. Shaft; 33. Tooth frame crank; 34. Feeding connecting rod; 35. Feeding crank; 36. Driving motor 2; 37. Tightening sleeve;

[0063] 4. Driving motor 1; 41. First motor shaft; 42. Second motor shaft; 43. Transmission assembly 1; 431. First crank; 432. Sliding block; 433. First toggle member; 434. First slide slot; 44. Fixed plate;

[0064] 5. Thread trimming mechanism; 51. second crank; 52. roller; 53. second cam; 54. thread trimming connecting rod; 55. thread trimming crank; 56. thread trimming knife; 57. connecting piece 1; 58. through hole 1;

[0065] 6. Swing seat; 61. First support shaft; 62. Second support shaft; 63. Eccentric connecting rod assembly; 64. Second toggle member; 65. Second slide groove; 66. First connecting member; 67. Second connecting member; 68. Toggle pin;

[0066] 7. Rotary hook assembly; 71. Hook wheel; 73. Thread hook crank;

[0067] 8. Upper shaft; 81. Needle bar driving assembly; 811. Third cam; 812. Needle bar crank; 813. Needle bar connecting rod; 814. Stop block; 815. Third slide; 82. Needle bar; 83. Driving motor three;

[0068] 9. Rotary hook shaft; 91. Transmission assembly 2; 911. Bevel gear 1; 912. Bevel gear 2; 92. Transmission connecting rod; 921. Bevel gear 1; 922. Bevel gear 2. DETAILED DESCRIPTION

[0069] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0070] Embodiment 1:

[0071] like Figure 1-Figure 4 The combined mechanism for thread trimming and adjusting the amount of tooth lifting of a lockstitch sewing machine shown in the figure comprises:

[0072] A thread cutting mechanism 5, which is used to cut the sewing thread;

[0073] A tooth lifting adjustment mechanism, which is used to control the height to which the tooth frame 1 is lifted;

[0074] The driving motor 4 drives the thread trimming mechanism 5 and the tooth lifting amount adjustment mechanism; the rotation area of ​​the motor shaft of the driving motor 4 can be divided into at least a thread trimming area and a tooth lifting amount adjustment area; when the motor shaft rotates in the thread trimming area, the thread trimming mechanism 5 performs the thread trimming action, and the tooth lifting amount adjustment mechanism does not perform effective height adjustment of the tooth frame 1; when the motor shaft rotates in the tooth lifting amount adjustment area, the tooth lifting amount adjustment mechanism adjusts the effective height of the tooth frame 1, and the thread trimming mechanism 5 does not perform the thread trimming action;

[0075] Among them, the tooth lifting amount adjustment mechanism includes:

[0076] The tooth lifting assembly 2 is connected to one end of the tooth frame 1, and the tooth frame 1 is equipped with a feed tooth 11; the tooth lifting assembly 2 is used to change the height of the tooth frame 1 so that the tooth frame 1 can fit on the fabric, increasing the friction between the feed tooth 11 and the fabric.

[0077] The joint assembly is connected to the tooth lifting assembly 2, the drive motor 1 4 and the upper shaft 8 at the same time. The upper shaft 8 is connected to the drive motor 3 83, and the drive motor 3 83 is used to drive the upper shaft 8 to be installed. The upper shaft 8 transmits power to the tooth lifting assembly 2 through the joint assembly, and the drive motor 1 4 can adjust the transmission amplitude between the upper shaft 8 and the tooth lifting assembly 2 through the joint assembly.

[0078] like Figure 1-Figure 6 As shown, the driving motor 14 is a double-shaft motor, and a first motor shaft 41 and a second motor shaft 42 extend from its two ends respectively. The first motor shaft 41 is used to drive the lifting assembly 2 of the lifting amount adjustment mechanism to perform an action, and the second motor shaft 42 is used to drive the thread trimming mechanism 5 to perform a thread trimming action. Fixed plates 44 are provided at both ends of the driving motor 14, so that the driving motor 14 can be screwed to the lower side of the working platform of the sewing equipment.

[0079] The thread trimming mechanism 5 comprises:

[0080] A second crank 51, which is sleeved on the second motor shaft 42, and a roller 52 is provided on the second crank 51;

[0081] A second cam 53, the roller 52 abuts against the inner surface of the second cam 53;

[0082] A thread trimmer link 54 connected to the second cam 53, which can drive the thread trimmer link 54 to rotate when the second cam 53 rotates;

[0083] The thread trimming connecting rod 54 is connected to the thread trimming crank 55, and a thread trimming knife 56 is arranged on the thread trimming crank 55; when the thread trimming connecting rod 54 rotates, the thread trimming crank 55 drives the thread trimming knife 56 to move and cut the sewing thread;

[0084] The thread trimmer crank 55 and the thread trimmer 56 are connected via a connector 57, and the connector 57 is formed with a through hole 58, so that the connector 57 can be sleeved on the end of the shuttle wheel 71 of the rotary shuttle assembly 7 and can drive the shuttle wheel 71 to rotate.

[0085] The second motor shaft 42 is provided with a second crank 51, on which a second cam 53 is provided, and the second cam 53 drives the thread trimming crank 55 to move through the thread trimming connecting rod 54. In this embodiment, the working curved surface of the second cam 53 is its inner side wall, and the roller 52 on the second crank 51 can abut against the working curved surface of the second cam 53 to drive the second cam 53 to rotate, and then the second cam 53 drives the thread trimming mechanism 5 to perform an action. The roller 52 is arranged inside the second cam 53, and the position of the roller 52 can also be limited, and the roller 52 is prevented from being separated from the second cam 53, so that the movement between the second cam 53 and the second crank 51 is more stable.

[0086] Further, as Figure 5-Figure 7 As shown, the thread trimmer crank 55 is disposed at one end of the thread trimmer connecting rod 54;

[0087] The other end of the thread trimming connecting rod 54 is also connected to a thread hooking crank 73 .

[0088] The joint components include:

[0089] The swing seat 6 is connected to the first motor shaft 41 of the driving motor 4 through the transmission assembly 43, so that the driving motor 4 can drive the swing seat 6 to swing within a set angle; the swing seat 6 is connected to the tooth lifting assembly 2 through the driving crank 22 to drive the tooth lifting assembly 2 to control the height of the feed dog 11;

[0090] One end of the eccentric connecting rod assembly 63 is connected to the swing seat 6 so that the swing seat 6 can be connected to the upper shaft 8.

[0091] Further, it includes a transmission assembly 2 91, the two ends of which are respectively arranged on the upper shaft 8 and the rotary hook shaft 9, so that the swing seat 6 can be connected to the rotary hook shaft 9;

[0092] The shuttle wheel 71 is passed through the rotary hook shaft 9 so that the shuttle wheel 71 can be driven by the rotary hook shaft 9 .

[0093] Transmission assembly 2 91 includes:

[0094] A bevel gear 911 is sleeved on the upper shaft 8;

[0095] The second bevel gear 912 is sleeved on one end of the rotary hook shaft 9, and the other end of the rotary hook shaft 9 is connected to the rotary hook assembly 7;

[0096] The transmission connecting rod 92 has a bevel gear part 1 921 formed on its upper end and a bevel gear part 2 922 formed on its lower end. The bevel gear part 1 921 can mesh with the bevel gear part 1 911, and the bevel gear part 2 912 can mesh with the bevel gear part 2 922, so that the upper shaft 8 can drive the rotary hook shaft 9 to rotate.

[0097] In the present technical solution, a transmission assembly 2 91 is provided to connect the upper shaft 8 and the rotary hook shaft 9, so as to realize transmission between the upper shaft 8 and the rotary hook shaft 9.

[0098] like Figure 1-Figure 4 As shown, a first support shaft 61 and a second support shaft 62 are respectively provided on both sides of the swing seat 6, and the first support shaft 61 is connected to the transmission assembly 43; the first support shaft 61 and the second support shaft 62 are provided on the same axis and extend into the two sides of the swing seat 6 respectively. The first support shaft 61 and the second support shaft 62 can be used to fix the position of the swing seat 6, so that the swing seat 6 can only rotate around the axis of the first support shaft 61 and the second support shaft 62, and the first support shaft 61 can drive the swing seat 6 to move.

[0099] The transmission component 43 includes:

[0100] A first crank 431 connected to the first motor shaft 41 , and a slider 432 is disposed at one end of the first crank 431 ;

[0101] A first toggle member 433 is provided with a first sliding groove 434, and the slider 432 can slide in the first sliding groove 434;

[0102] The first shifting member 433 and the first crank 431 are respectively fixed on the first supporting shaft 61 or the first motor shaft 41, so that the driving motor 1 4 can drive the swing seat 6 to swing.

[0103] The specific structure between the first support shaft 61 and the swing seat 6 is: a round hole is provided on one side of the swing seat 6 , and the end of the first support shaft 61 extends into the round hole and supports the swing seat 6 .

[0104] The swing seat 6 and the first support shaft 61 are not directly transmitted. A second toggle member 64 is installed on the first support shaft 61. A second slide groove 65 for setting a toggle pin is provided on the second toggle member 64. A toggle pin 68 is provided on one side of the front part of the swing seat 6. The toggle pin is inserted into the second slide groove 65, so that the swing seat 6 can swing synchronously with the second toggle member 64. The structure of the toggle pin 68 is not only easy to install and assemble, but also can provide a sufficient fixing effect, and then the second toggle member 64 can be more stable when toggling the swing seat 6 through the stable sliding of the toggle pin 68 in the second slide groove 65. The first support shaft 61 can be driven by the toggle pin 68 while supporting the swing seat 6, thereby ensuring that the swing seat 6 can swing synchronously with the second toggle member 64, and improving the accuracy of the transmission effect.

[0105] like Figure 1-Figure 6As shown, the swing seat 6 is U-shaped, and a first connecting member 66 is hinged on both side walls on the inner side of the front portion of the swing seat 6, the other end of the first connecting member 66 is coaxially hinged with the second connecting member 67 and the lower end of the eccentric connecting rod assembly 63, and the other end of the second connecting member 67 is hinged with the movable end of the driving crank 22;

[0106] The upper end of the eccentric connecting rod assembly 63 is sleeved on the upper shaft 8 and receives the power;

[0107] The driving crank 22 is fixedly mounted on the tooth lifting shaft 23 and drives the tooth lifting shaft 23 to reciprocate.

[0108] The first connecting member 66 is connected to the eccentric connecting rod assembly 63 so that the swing seat 6 is connected to the upper shaft 8 and the upper shaft 8 can drive the swing seat 6 to swing.

[0109] The second connecting member 67 is connected to the driving crank 22, and the driving crank 22 drives the tooth lifting amount adjustment mechanism to work through the tooth lifting shaft 23. The tooth lifting shaft 23 is also fixed inside the sewing machine so that the tooth lifting shaft 23 can only rotate. Therefore, the end of the driving crank 22 is also fixed, and the driving crank 22 can only rotate around the tooth lifting shaft 23.

[0110] The upper end of the eccentric connecting rod assembly 63 is connected to the upper shaft 8, so that the eccentric connecting rod assembly 63 can only rotate around the upper shaft 8. The lower end of the eccentric connecting rod assembly 63 is connected to the swing seat 6 through the first connecting member 66 and the second connecting member 67.

[0111] The swing path of the swing seat 6 can be limited by driving the crank 22 and the eccentric connecting rod assembly 63, so that the swing seat 6 can swing along the designed route.

[0112] like Figure 1-Figure 8 The flat sewing machine shown in the figure comprises a combined mechanism for cutting thread and adjusting the amount of tooth lifting of the flat sewing machine as described above, and also comprises

[0113] The feeding assembly 3 is connected to the other end of the tooth frame 1, and is used to drive the tooth frame 1 to swing back and forth in the horizontal direction; the tooth lifting assembly 2 and the feeding assembly 3 cooperate to drive the feeding tooth 11 to complete the feeding action;

[0114] The feeding assembly 3 comprises:

[0115] The tooth frame seat 31 has a lower end formed into a clamping sleeve 37, and the tooth frame 1 is hinged at the upper end of the tooth frame seat 31. The tooth frame seat 31 is used to drive the tooth frame 1 to swing back and forth;

[0116] The shaft 32 is inserted into the clamping sleeve 37 and locked to the outside of the shaft 32 by the clamping sleeve 37. The axial position and angular position of the tooth holder seat 31 on the shaft 32 can be adjusted by loosening the clamping sleeve 37.

[0117] A tooth frame crank 33, one end of which is sleeved on the shaft 32, and is used to drive the shaft 32 to rotate;

[0118] A feeding crank 35, which is used to connect to the second driving motor 36, and the feeding crank 35 is connected to the tooth frame crank 33 through a feeding connecting rod 34;

[0119] The tooth lifting assembly 2 includes a tooth lifting crank 21, which is connected to the other end of the tooth frame 1. The tooth lifting crank 21 is used to drive the tooth frame 1 to move up and down.

[0120] The tooth frame seat 31 has a lower end formed into a clamping sleeve 37, and the tooth frame 1 is hinged at the upper end of the tooth frame seat 31. The tooth frame seat 31 is used to drive the tooth frame 1 to swing back and forth;

[0121] The shaft 32 is inserted into the clamping sleeve 37 and locked to the outside of the shaft 32 by the clamping sleeve 37. The axial position and angular position of the tooth holder seat 31 on the shaft 32 can be adjusted by loosening the clamping sleeve 37.

[0122] A tooth frame crank 33, one end of which is sleeved on the shaft 32, and is used to drive the shaft 32 to rotate;

[0123] A feeding crank 35, which is used to connect to a driving source, and the feeding crank 35 is connected to the tooth frame crank 33 through a feeding connecting rod 34;

[0124] The tooth lifting assembly 2 includes a tooth lifting crank 21, which is connected to the other end of the tooth frame 1. The tooth lifting crank 21 is used to drive the tooth frame 1 to move up and down.

[0125] like Fig. 9 As shown, in this embodiment, the needle bar drive assembly 81 includes:

[0126] A third cam 811, which is sleeved on the end of the upper shaft 8;

[0127] A needle bar crank 812 is connected to the third cam 811, and can drive the needle bar crank 812 to move when the third cam 811 rotates;

[0128] A needle bar connecting rod 813, the upper end of which is connected to the needle bar crank 812, and the lower end of which is connected to the needle bar 82;

[0129] The third slide groove 815: It is fixed on the sewing machine housing, and a limit block 814 is also formed on the needle bar connecting rod 813. The limit block 814 can slide along the third slide groove 815, so as to fix the moving path of the needle bar 82 connected to the needle bar connecting rod 813, so that the needle bar 82 can move in the vertical direction.

[0130] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine, characterized in that: include: A thread cutting mechanism (5) for cutting the sewing thread; A tooth lifting adjustment mechanism, which is used to control the height to which the tooth frame (1) is lifted; A driving motor (4) drives the thread trimming mechanism (5) and the tooth lifting amount adjustment mechanism; the rotation area of ​​the motor shaft of the driving motor (4) can be divided into at least a thread trimming area and a tooth lifting amount adjustment area; when the motor shaft rotates in the thread trimming area, the thread trimming mechanism (5) performs a thread trimming action, and the tooth lifting amount adjustment mechanism does not perform an effective height adjustment of the tooth frame (1); when the motor shaft rotates in the tooth lifting amount adjustment area, the tooth lifting amount adjustment mechanism adjusts the effective height of the tooth frame (1), and the thread trimming mechanism (5) does not perform a thread trimming action; Wherein, the tooth lifting amount adjustment mechanism comprises: A tooth lifting component (2) connected to one end of the tooth frame (1), the tooth lifting component (2) being used to change the height of the tooth frame (1); a feed tooth (11) is installed on the tooth frame (1); A combined component simultaneously connects the tooth lifting component (2), a drive motor (4) and an upper shaft (8); the upper shaft (8) transmits power to the tooth lifting component (2) through the combined component, and the drive motor (4) adjusts the transmission amplitude between the upper shaft (8) and the tooth lifting component (2) through the combined component.

2. The combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to claim 1, characterized in that: The driving motor 1 (4) is a double-shaft motor, wherein the first motor shaft (41) drives the combined component, and the second motor shaft (42) drives the thread trimming mechanism (5); The thread cutting mechanism (5) comprises: A second crank (51) sleeved on the second motor shaft (42), wherein the second crank (51) is provided with a roller (52); a second cam (53), the roller (52) abutting against the inner surface of the second cam (53); A thread trimming connecting rod (54) connected to the second cam (53), which can drive the thread trimming connecting rod (54) to rotate when the second cam (53) rotates; The thread trimming connecting rod (54) is connected to a thread trimming crank (55), and a thread trimming knife (56) is arranged on the thread trimming crank (55); when the thread trimming connecting rod (54) rotates, the thread trimming crank (55) drives the thread trimming knife (56) to move and cut the sewing thread; The thread trimmer crank (55) and the thread trimmer knife (56) are connected via a connecting piece (57), and the connecting piece (57) is formed with a through hole (58) so that the connecting piece (57) can be sleeved on the end of the shuttle wheel (71) of the rotary shuttle assembly (7) and can drive the shuttle wheel (71) to rotate.

3. The combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to claim 1, characterized in that: The combined components include: The swing seat (6) is connected to the first motor shaft (41) of the driving motor (4) through a transmission assembly (43), so that the driving motor (4) can drive the swing seat (6) to swing within a set angle; the swing seat (6) is connected to the tooth lifting assembly (2) through a driving crank (22) to drive the tooth lifting assembly (2) to control the height of the feed dog (11); An eccentric connecting rod assembly (63) has one end connected to the swing seat (6), so that the swing seat (6) is connected to the upper shaft (8).

4. The combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to claim 3, characterized in that: A first support shaft (61) and a second support shaft (62) are respectively arranged on both sides of the swing seat (6), and the first support shaft (61) is connected to the transmission component 1 (43); the first support shaft (61) and the second support shaft (62) are arranged on the same axis and extend into the two sides of the swing seat (6) respectively; The specific structure between the first support shaft (61) and the swing seat (6) is as follows: a circular hole is provided on one side of the swing seat (6), and the end of the first support shaft (61) extends into the circular hole and supports the swing seat (6); the swing seat (6) and the first support shaft (61) do not directly transmit power; a second toggle member (64) is installed on the first support shaft (61), and a second slide groove (65) for setting a toggle pin is provided on the second toggle member (64), and a toggle pin (68) is provided on one side of the front part of the swing seat (6), and the toggle pin is inserted into the second slide groove (65), so that the swing seat (6) can swing synchronously with the second toggle member (64).

5. A combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to claim 3 or 4, characterized in that: The transmission assembly 1 (43) comprises: A first crank (431) connected to the first motor shaft (41), wherein a slider (432) is provided at one end of the first crank (431); A first toggle member (433) is provided with a first sliding groove (434), and the slider (432) can slide in the first sliding groove (434); The first shifting member (433) and the first crank (431) are respectively fixed on the first supporting shaft (61) or the first motor shaft (41); The first support shaft (61) is also provided with a second toggle member (64), and the second toggle member (64) is provided with a second slide groove (65) for arranging a toggle pin, and the toggle pin can be inserted into the swing seat (6) and the second slide groove (65), so that the swing seat (6) can swing synchronously with the second toggle member (64).

6. The combined mechanism for thread trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to claim 5, characterized in that: The swing seat (6) is U-shaped, and a first connecting member (66) is hinged on both side walls on the inner side of the front portion of the swing seat (6), the other end of the first connecting member (66) is coaxially hinged with the second connecting member (67) and the lower end of the eccentric connecting rod assembly (63), and the other end of the second connecting member (67) is hinged with the movable end of the driving crank (22); The upper end of the eccentric connecting rod assembly (63) is sleeved on the upper shaft (8) and receives power; The driving crank (22) is fixedly mounted on the tooth lifting shaft (23) and drives the tooth lifting shaft (23) to reciprocate.

7. A lockstitch sewing machine, characterized in that: A combined mechanism for trimming and adjusting the thread lifting amount of a lockstitch sewing machine according to any one of claims 1 to 6, further comprising A feeding assembly (3) connected to the other end of the tooth frame (1), the feeding assembly (3) being used to drive the tooth frame (1) to swing back and forth in the horizontal direction; the tooth lifting assembly (2) and the feeding assembly (3) cooperate to drive the feeding tooth (11) to complete the feeding action; The feeding assembly (3) comprises: A tooth frame seat (31), the lower end of which is formed into a clamping sleeve (37), the tooth frame (1) is hinged at the upper end of the tooth frame seat (31), and the tooth frame seat (31) is used to drive the tooth frame (1) to swing back and forth; A shaft (32) is inserted into the clamping sleeve (37) and is locked to the outside of the shaft (32) by the clamping sleeve (37). The axial position and angular position of the tooth holder seat (31) on the shaft (32) can be adjusted by loosening the clamping sleeve (37); A tooth frame crank (33), one end of which is sleeved on the shaft (32) and is used to drive the shaft (32) to rotate; A feeding crank (35) used for connecting to a second driving motor (36), wherein the feeding crank (35) is connected to the tooth frame crank (33) via a feeding connecting rod (34); The tooth lifting component (2) comprises a tooth lifting crank (21), the tooth lifting crank (21) is connected to the other end of the tooth frame (1), and the tooth lifting crank (21) is used to drive the tooth frame (1) to move up and down.

Images