Button sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a button sewing machine which comprises a thread trimming driving rod, a thread trimming fork opening pushed by a cam is formed in the upper end of the thread trimming driving rod, and the lower end of the thread trimming driving rod is connected with a thread trimming connecting rod assembly. The middle end of the lifting and pressing lever is rotatably arranged in the machine body, a pushing part for pushing the cam is formed at one end of the lifting and pressing lever, the other end of the lifting and pressing lever is connected with a lifting and pressing foot assembly, and a first thread loosening part is formed on the lifting and pressing lever; a thread loosening fork opening for a first thread loosening part to push is formed in the lower end of the thread loosening driving rod, the upper end of the thread loosening driving rod is connected with a thread loosening assembly, and in the rotating process of the cam, one side of the thread shearing fork opening is firstly pushed, so that the thread shearing action is executed through the thread shearing connecting rod assembly, then the lifting and pressing lever is pushed, and the presser foot lifting action is executed through the presser foot lifting assembly. The thread trimming and presser foot lifting procedures are completed in sequence.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a button sewing machine. Background Art

[0002] Existing button sewing machines are usually provided with a presser foot lifting mechanism, a thread cutting mechanism and a thread loosening mechanism, and are usually driven by mechanical force or an electromagnet.

[0003] For example, the Chinese utility model, with publication number CN217459840U, discloses a sewing machine, comprising: a frame, on which a first driving rod and a second driving rod are hinged; a driving disk, which is arranged between the first driving rod and the second driving rod, and the hinge axis of the first driving rod, the hinge axis of the second driving rod and the axis of the driving disk are arranged in parallel; a protrusion is arranged on the driving disk, when the driving disk rotates by a first angle in a preset direction, the protrusion contacts one end of the first driving rod to drive the first driving rod to rotate, and when the driving disk rotates by a second angle in the opposite direction of the preset direction, the protrusion contacts one end of the second driving rod to drive the second driving rod to rotate; a driving member, which is transmission-connected with the driving disk, and is used to drive the driving disk to rotate; a thread trimming mechanism, which is connected to the other end of the first driving rod; a presser foot mechanism, and the presser foot lifting mechanism is connected to the other end of the second driving rod.

[0004] By driving the drive disk forward and reverse rotation by the motor, the thread trimming and presser foot lifting processes are completed in sequence, thereby solving the technical problem in the related art that the thread trimming and presser foot lifting are performed simultaneously, resulting in a long thread head on the product after thread trimming. However, the structure of the thread trimming and presser foot lifting mechanism is complicated. When the drive disk rotates forward, it drives the thread trimming mechanism to complete the thread trimming action, and then the drive disk reverses to drive the presser foot lifting mechanism to complete the presser foot lifting action, which makes the response speed slow and the installation and debugging complicated. Therefore, the structure needs to be further improved. Utility Model Content

[0005] The utility model aims to provide a button sewing machine which solves the problems of the existing button sewing machine having speed limit, large vibration and noise during high-speed movement, no automatic oil supply and unstable presser foot lifting through reasonable new structural design.

[0006] The purpose of the utility model is achieved in this way: a button sewing machine, comprising

[0007] The machine base and the machine body, a stepper motor 1 is installed on the side of the machine body, and a cam is installed on the output shaft of the stepper motor 1;

[0008] A servo spindle motor is installed at the rear end of the machine body. The output shaft of the servo spindle motor is coaxially connected to the sewing machine spindle. The other end of the sewing machine spindle is connected to the needle bar assembly. A synchronous belt transmission mechanism is installed between the sewing machine spindle and the sewing machine lower shaft.

[0009] The other end of the lower shaft of the sewing machine is connected with a hook thread assembly, and an oil pump assembly is arranged in the machine base;

[0010] A thread trimming driving rod, wherein the upper end of the thread trimming driving rod is formed with a thread trimming fork for being pushed by a cam, and the lower end of the thread trimming driving rod is connected with a thread trimming connecting rod assembly;

[0011] A button lifting lever, the middle end of which is rotatably arranged in the machine body, one end of which is formed with a pushing portion for being pushed by the cam, and the other end of which is connected with a presser foot lifting assembly;

[0012] When the cam rotates by a first angle in a preset direction, the cam pushes one side of the thread trimming fork to perform a thread trimming action through the thread trimming link assembly;

[0013] When the cam rotates in a preset direction by a second angle, the cam pushes the other side of the thread trimming fork to force the thread trimming connecting rod assembly to reset; the cam pushes the buckle lifting lever to perform the presser foot lifting action through the presser foot lifting assembly.

[0014] Preferably, the thread cutting fork comprises a thread cutting portion and a resetting portion.

[0015] Preferably, the buckle lifting lever includes an upper and lower lever 1 and an upper and lower lever 2, a fixing hole is opened at one end of the upper and lower lever 1, a strip adjustment hole 2 is opened at one end of the upper and lower lever 2, and a connecting shaft is installed between the upper and lower lever 1 and the upper and lower lever 2.

[0016] Preferably, two stepper motors 2 are arranged in the machine body, and the output shafts of the two stepper motors 2 are respectively installed with swing rods, and the other ends of the swing rods are connected to the feeding slide plate.

[0017] Preferably, the synchronous belt transmission mechanism comprises a driving wheel installed on the periphery of the sewing machine main shaft and a driven wheel installed on the periphery of the sewing machine lower shaft, and a transmission belt is connected between the driven wheel and the driving wheel.

[0018] Preferably, an oil tank, an oil pump and a lower diverter valve are arranged in the machine base, an upper diverter valve is arranged in the machine body, the oil tank is connected to an oil suction pipe 1, the other end of the oil suction pipe 1 is connected to a three-way valve, the outlet of the three-way valve is connected to an oil suction pipe 2, the other end of the oil suction pipe 2 is connected to an oil pump, the output end of the oil pump is connected to an oil outlet pipe 3, the oil outlet pipe 3 is connected to the upper end of the upper diverter valve, the lower end of the upper diverter valve is respectively connected to an oil inlet sponge 1 and an oil outlet pipe 4, the other end of the oil inlet sponge 1 extends to the machine The lower end of the machine body is connected with an oil return pipe 4, and the other end of the oil return pipe 4 is connected to the oil tank.

[0019] Preferably, the needle bar assembly includes a needle bar crank arranged at the end of the sewing machine main shaft, the eccentric portion of the needle bar crank is connected to the needle bar connecting rod, the end of the needle bar connecting rod is provided with a needle bar clamp, and the needle bar clamp is fixed to the outer periphery of the needle bar, thereby driving the needle bar to reciprocate up and down.

[0020] Preferably, a wire loosening portion is formed on the buckle lifting lever, a wire loosening fork is formed at the lower end of the wire loosening driving rod for being pushed by the wire loosening portion, a wire loosening assembly is connected to the upper end of the wire loosening driving rod, and when the cam rotates by a second angle along a preset direction, the buckle lifting lever pushes the wire loosening driving rod to perform the wire loosening action through the wire loosening assembly.

[0021] Preferably, the wire loosening assembly includes a wire passing plate, a wire passing hole 1 is provided in the wire passing plate, a through groove for the upper end of the wire loosening driving rod to extend is provided on the machine body, and a wire passing hole 2 is provided on the upper end of the wire loosening driving rod. A wire clamping block and a movable wire plate are respectively provided on the wire passing plate, a wire clamping plate is formed on the movable wire plate, and a wire passing space is formed between the wire clamping plate and the wire clamping block. One end of the movable wire plate is rotatably connected to the machine body, and a spring is connected between the movable wire plate and the machine body to drive the wire clamping plate to keep moving toward the side close to the wire clamping block, and one end of the movable wire plate is formed with a wire loosening part 2 for the upper end of the wire loosening driving rod to push.

[0022] Preferably, the wire passing plates are respectively arranged on both sides of the through groove, and a strip-shaped adjustment hole is opened on the wire passing plate for the fastener to pass through; a protrusion is formed on the upper end of the wire loosening driving rod for pushing the wire loosening part two, and a protrusion is formed on the side of the wire loosening part two; a rotating shaft is installed in the middle of the wire clamping block, and the wire clamping block can be rotatably arranged on the wire passing plate.

[0023] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0024] The utility model adopts the design of the cam. In the actual working process, the cam will first push one side of the thread trimming fork during the rotation process to perform the thread trimming action through the thread trimming connecting rod assembly, and then push the buckle lifting lever to perform the presser foot lifting action through the presser foot lifting assembly, so that the thread trimming and presser foot lifting processes are completed in sequence, thereby solving the problem of long thread ends after thread trimming caused by simultaneous presser foot lifting and thread trimming in the prior art, and while lifting the presser foot, the cam pushes the other side of the thread trimming fork to force the thread trimming connecting rod assembly to reset, and the mechanical structure is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0026] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0027] Figure 3 The structure of the utility model is shown in FIG. Figure 3 .

[0028] Figure 4 It is a schematic diagram of the structure of the utility model when cutting wire.

[0029] Figure 5 It is a schematic diagram of the structure of the utility model when the presser foot is lifted.

[0030] Figure 6 This is a schematic diagram of the structure of the loose wire component when it is not working.

[0031] Figure 7 This is a schematic diagram of the working structure of the wire loosening component.

[0032] Figure 8 The internal oil supply structure of the utility model is shown in FIG. Figure 1 .

[0033] Fig. 9 The internal oil supply structure of the utility model is shown in FIG. Figure 2 .

[0034] Figure numerals: 1-body; 2-stepping motor 1; 3-cam; 4-thread trimming drive rod; 5-thread trimming fork; 6-thread trimming connecting rod assembly; 7-lifting lever; 8-pushing part; 9-presser foot lifting assembly; 10-thread loosening part 1; 11-thread loosening drive rod; 12-thread loosening fork; 13-thread loosening assembly; 14-thread passing plate; 15-thread passing hole 1; 16-through groove; 17-thread passing hole 2; 18-thread clamping block; 19-movable thread plate; 20-thread clamping plate; 21-thread passing space; 22-thread loosening part 2; 23-strip adjustment hole 1; 24-bump 1; 25-bump 2; 26-rotating shaft;

[0035] 27-thread trimmer; 28-reset unit; 29-upper and lower lever 1; 30-upper and lower lever 2; 31-bar adjustment hole 2; 32-connecting shaft; 33-stepping motor 2; 34-rocker; 35-feeding slide plate; 36-servo spindle motor; 37-sewing machine spindle; 38-sewing machine lower shaft; 39-synchronous belt transmission mechanism; 40-driving wheel; 41-driven wheel; 42-driving belt; 45-needle bar assembly; 46 -hook line assembly; 47-oil tank; 48-oil pump; 49-lower diverter valve; 50-upper diverter valve; 51-oil suction pipe one; 52-three-way valve; 53-oil suction pipe two; 54-oil outlet pipe three; 55-oil induction sponge one; 56-oil outlet pipe four; 57-oil return pipe one; 58-oil induction sponge two; 59-oil return pipe two; 60-oil return pipe four; 61-needle rod crank; 62-needle rod connecting rod; 63-needle rod clamp; 64-needle rod. DETAILED DESCRIPTION

[0036] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0037] A button sewing machine, comprising

[0038] The machine base and the machine body 1, the side of the machine body 1 is equipped with a stepper motor 2, and the output shaft of the stepper motor 2 is equipped with a cam 3, which respectively controls the thread trimming, presser foot lifting and thread loosening actions;

[0039] A servo spindle motor 36 is installed at the rear end of the machine body 1. The output shaft of the servo spindle motor 36 is coaxially connected to a sewing machine spindle 37. The other end of the sewing machine spindle 37 is connected to a needle bar assembly 45. A synchronous belt transmission mechanism 39 is installed between the sewing machine spindle 37 and the sewing machine lower shaft 38.

[0040] The other end of the sewing machine lower shaft 38 is connected to a hook thread assembly 46, and an oil pump assembly 47 is arranged in the machine base;

[0041] The needle bar assembly 45 and the hook thread assembly 46 are existing components in a button sewing machine.

[0042] A thread trimming driving rod 4, the upper end of which is formed with a thread trimming fork 5 for the cam 3 to push, and the lower end of which is connected with a thread trimming connecting rod assembly 6. When the cam 3 rotates, it will push the thread trimming fork 5 to drive the thread trimming driving rod 4 to move, thereby performing a thread trimming action;

[0043] A button lifting lever 7, the middle end of which is rotatably arranged in the machine body 1, one end of which is formed with a pushing portion 8 for being pushed by the cam 3, and the other end of which is connected with a presser foot lifting assembly 9. During the rotation process, the cam 3 will drive the button lifting lever 7 to move by pushing the pushing portion 8, thereby performing a presser foot lifting action, and a loosening portion 10 is formed on the button lifting lever 7;

[0044] A wire loosening driving rod 11, the lower end of which is formed with a wire loosening fork 12 for the wire loosening part 10 to push, and the upper end of the wire loosening driving rod 11 is connected with a wire loosening assembly 13, and the lifting and buckling lever 7, during the action, will also push the wire loosening driving rod 11 through the wire loosening part 10 and the wire loosening fork 12, so that the wire loosening assembly 13 performs the wire loosening action;

[0045] When the cam 3 rotates by a first angle along a preset direction, the cam 3 pushes one side of the thread trimming fork 5 to perform a thread trimming action through the thread trimming link assembly 6;

[0046] When the cam 3 rotates to a second angle along a preset direction, the cam 3 pushes the other side of the thread trimming fork 5 to force the thread trimming connecting rod assembly 6 to reset; the cam 3 pushes the buckle lifting lever 7 to perform the presser foot lifting action through the presser foot lifting assembly 9; the buckle lifting lever 7 pushes the thread loosening drive rod 11 to perform the thread loosening action through the thread loosening assembly 13.

[0047] The utility model uses a single stepping motor to drive the thread trimming and presser foot lifting actions respectively. Compared with the driving method using an electromagnet in the prior art, the utility model has lower costs, higher stability, is not easy to be damaged, and has a long service life.

[0048] The utility model adopts the design of the cam. In the actual working process, the cam 3 will first push one side of the thread trimming fork 5 during the rotation process to perform the thread trimming action through the thread trimming connecting rod assembly 6, and then push the buckle lifting lever 7 to perform the presser foot lifting action through the presser foot lifting assembly 9, so that the thread trimming and presser foot lifting processes are completed in sequence, thereby solving the problem of long thread ends after thread trimming caused by simultaneous presser foot lifting and thread trimming in the prior art, and while lifting the presser foot, the cam 3 pushes the other side of the thread trimming fork 5 to force the thread trimming connecting rod assembly 6 to reset. The mechanical structure is reliable, will not cause safety hazards in work due to the lack of reset, and improves the stability of the thread trimming and presser foot lifting actions.

[0049] The wire loosening assembly 13 includes a wire passing plate 14, a wire passing hole 15 is provided in the wire passing plate 14, a through groove 16 is provided on the body 1 for the upper end of the wire loosening driving rod 11 to extend, and a wire passing hole 2 17 is provided on the upper end of the wire loosening driving rod 11, and a wire clamping block 18 and a movable wire plate 19 are respectively provided on the wire passing plate 14, a wire clamping plate 20 is formed on the movable wire plate 19, and a wire passing space 21 is formed between the wire clamping plate 20 and the wire clamping block 18, one end of the movable wire plate 19 is rotatably connected to the body 1, and a spring is connected between the movable wire plate 19 and the body 1 to drive the wire clamping plate 20 to keep moving toward the side close to the wire clamping block 18, and one end of the movable wire plate 19 is formed with a wire loosening part 22 for the upper end of the wire loosening driving rod 11 to push.

[0050] The utility model adopts the design of the loose wire assembly 13, in the normal working process, first look at Figure 6 The upper end of the thread loosening driving rod 11 abuts against the thread loosening portion 22, so that the suture can move in the thread passing hole 15, the thread passing hole 17 and the thread passing space 21. When the presser foot is lifted, the thread loosening driving rod 11 rotates at the same time, and the thread loosening driving rod 11 is combined with the thread loosening driving rod 11 to move the thread through the thread hole 15, the thread passing hole 17 and the thread passing space 21. Figure 7 , its upper end moves toward the side away from the second thread loosening portion 22, and the action of the spring will drive the movable thread plate 19 to move toward the side close to the thread clamping block 18, thereby fixing the suture clamp between the thread clamping plate 20 and the thread clamping block 18. As the thread loosening drive rod 11 continues to rotate, the suture in the thread hole 17 will be driven to move forward, thereby realizing the thread loosening action.

[0051] Combination Figure 6 and Figure 7 The wire-passing plates 14 are respectively arranged on both sides of the through slot 16, and a strip-shaped adjustment hole 23 for fasteners to pass through is opened on the wire-passing plates 14, so as to adjust the installation position of the wire-passing plates 14, and the adjustment and installation are convenient.

[0052] The upper end of the wire loosening driving rod 11 is formed with a protrusion 24 for pushing the second wire loosening part 22 , and the side surface of the second wire loosening part 22 is formed with a protrusion 25 to facilitate pushing the second wire loosening part 22 .

[0053] A rotating shaft 26 is installed in the middle of the thread clamping block 18, and the thread clamping block 18 can be rotatably arranged on the thread passing plate 14, so that the end surface of the thread clamping plate 20 can be attached to the end surface of the thread clamping block 18, thereby fixing the suture.

[0054] The thread cutting fork 5 includes a thread cutting portion 27 and a reset portion 28. Figure 4 When the cam 3 rotates in a preset direction by a first angle, the cam 3 pushes the thread trimming portion 27 of the thread trimming fork 5 to perform the thread trimming action through the thread trimming link assembly 6; Figure 5 When the cam 3 continues to rotate to the second angle along the preset direction, the cam 3 pushes the reset portion 28 of the thread trimming fork 5 to force the thread trimming link assembly 6 to reset; then the cam 3 continues to rotate, which will push the button lifting lever 7 to perform the presser foot lifting action through the presser foot lifting assembly 9.

[0055] Look specifically Figure 3 The button lifting lever 7 includes an upper and lower lever 29 and an upper and lower lever 2 30. A fixing hole is opened at one end of the upper and lower lever 29, and a strip adjustment hole 2 31 is opened at one end of the upper and lower lever 2 30. During the installation process, in order to adjust the position of the upper and lower lever 2 30 and thus adjust the height of the presser foot, a connecting shaft 32 is installed between the upper and lower lever 29 and the upper and lower lever 2 30.

[0056] Look specifically Figure 1Two stepper motors 33 are arranged in the machine body 1, and the output shafts of the two stepper motors 33 are respectively installed with swing rods 34, and the other end of the swing rod 34 is connected to a feeding slide 35. The machine tool that controls the swing button through the eccentric crank combination of the two stepper motors 33 defines the X and Y direction components.

[0057] Look specifically Figure 1 A servo spindle motor 36 is installed at the rear end of the body 1, and the output shaft of the servo spindle motor 36 is connected to the sewing machine main shaft 37. The synchronous belt transmission mechanism 39 includes a driving wheel 40 installed on the periphery of the sewing machine main shaft 37 and a driven wheel 41 installed on the periphery of the sewing machine lower shaft 38. A transmission belt 42 is connected between the driven wheel 41 and the driving wheel 40. The transmission belt 42 can drive the sewing machine lower shaft 38 to rotate at a high speed, thereby solving the problem of low upper limit of needle movement speed in the button sewing machine using an eccentric connecting rod in the prior art, and has the advantages of shock absorption and noise reduction. An oil pump assembly 47 is arranged in the body 1, and the oil pump is connected to a plurality of oil pipes, so as to transport oil to various components in the sewing machine to achieve a lubrication effect.

[0058] Combination Figure 8 and Fig. 9 The base is provided with an automatic oil supply device, which includes an oil tank 47, an oil pump 48 and a lower diverter valve 49. An upper diverter valve 50 is provided in the body 1. The oil tank 47 is connected to an oil suction pipe 1 51, and the other end of the oil suction pipe 1 51 is connected to a three-way valve 52. The outlet of the three-way valve 52 is connected to an oil suction pipe 2 53, and the other end of the oil suction pipe 2 53 is connected to the oil pump 48. The output end of the oil pump 48 is connected to an oil outlet pipe 3 54, and the oil outlet pipe 3 54 is connected to the upper end of the upper diverter valve 50. The lower end of the upper diverter valve 50 is respectively connected to an oil induction sponge 1 55 and an oil outlet pipe 4 56, and the oil induction sponge 1 The other end of 55 extends into the machine head to supply oil to the needle rod assembly 45. The lower end of the machine head is connected to a return oil pipe 57, and the other end of the return oil pipe 57 is connected to the three-way valve 52. The other end of the oil outlet pipe 4 56 is connected to the upper end of the lower diverter valve 49. The lower end of the lower diverter valve 49 is respectively connected to an oil inlet sponge 2 58 and an oil return pipe 2 59. The other end of the oil inlet sponge 2 58 extends to the front end of the machine base to supply oil to the hook line assembly 46. The other end of the return oil pipe 2 59 is connected to the oil tank 47. The lower end of the machine body 1 is connected to a return oil pipe 4 60, and the other end of the return oil pipe 4 60 is connected to the oil tank 47.

[0059] When the oil pump is working, the oil in the oil tank can be drawn through the oil pipe and first transported to the diverter valve, and then transported to various components to achieve lubrication effect. It can effectively prevent excessive oil injection and ensure that the oil is not supplied too quickly. The upper diverter valve is located at the head of the machine and is relatively high. It can rely on gravity to automatically drain the oil to other parts of the sewing machine, so that the oil supply remains even and the oil supply speed remains slow.

[0060] The utility model adopts the design of the oil pump, so that in the actual working process, the oil in the oil tank is extracted through the oil suction pipe 2 and the oil suction pipe 1, and then the oil is first transported to the diverter valve through the oil outlet pipe 3 and the oil outlet pipe 4 respectively, and then a small amount of oil is continuously drained into the working parts through the oil guide cotton, so as to achieve continuous lubrication. Compared with the manual refueling in the prior art, the utility model can realize automatic refueling, which is easy to operate, ensures that the machine can run for a long time, and extends the service life.

[0061] Look specifically Figure 1 The needle bar assembly 45 includes a needle bar crank 61 arranged at the end of the sewing machine main shaft 37, the eccentric part of the needle bar crank 61 is connected to the needle bar connecting rod 62, and the end of the needle bar connecting rod 62 is provided with a needle bar clamp 63, and the needle bar clamp 63 is fixed to the outer periphery of the needle bar 64, thereby driving the needle bar 64 to move reciprocally up and down, thereby improving stability.

[0062] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A button sewing machine, characterized in that: include A machine base and a machine body (1), a stepper motor (2) is mounted on the side of the machine body (1), and a cam (3) is mounted on the output shaft of the stepper motor (2); A servo spindle motor (36) is installed at the rear end of the machine body (1); an output shaft of the servo spindle motor (36) is coaxially connected to a sewing machine spindle (37); the other end of the sewing machine spindle (37) is connected to a needle bar assembly (45); a synchronous belt transmission mechanism (39) is installed between the sewing machine spindle (37) and the sewing machine lower shaft (38); The other end of the sewing machine lower shaft (38) is connected with a hook thread assembly (46); A thread trimming driving rod (4), wherein the upper end of the thread trimming driving rod (4) is formed with a thread trimming fork (5) for being pushed by the cam (3), and the lower end of the thread trimming driving rod (4) is connected with a thread trimming connecting rod assembly (6); A button lifting lever (7), the middle end of which is rotatably arranged in the machine body (1), one end of which is formed with a pushing portion (8) for being pushed by the cam (3), and the other end of which is connected to a presser foot lifting assembly (9); When the cam (3) rotates by a first angle in a preset direction, the cam (3) pushes one side of the thread trimming fork (5) to perform a thread trimming action through the thread trimming link assembly (6); When the cam (3) rotates along a preset direction to a second angle, the cam (3) pushes the other side of the thread trimming fork (5) to force the thread trimming connecting rod assembly (6) to reset; the cam (3) pushes the button lifting lever (7) to perform a presser foot lifting action through the presser foot lifting assembly (9).

2. The button sewing machine according to claim 1, characterized in that: The thread cutting fork (5) comprises a thread cutting portion (27) and a resetting portion (28).

3. The button sewing machine according to claim 1, characterized in that: The buckle lifting lever (7) comprises an upper and lower lever 1 (29) and an upper and lower lever 2 (30), one end of the upper and lower lever 1 (29) is provided with a fixing hole, one end of the upper and lower lever 2 (30) is provided with a strip-shaped adjustment hole 2 (31), and a connecting shaft (32) is installed between the upper and lower lever 1 (29) and the upper and lower lever 2 (30).

4. The button sewing machine according to claim 1, characterized in that: Two stepper motors (33) are arranged in the machine body (1), and the output shafts of the two stepper motors (33) are respectively installed with swing rods (34), and the other end of the swing rod (34) is connected to a feeding slide plate (35).

5. The button sewing machine according to claim 1, characterized in that: The synchronous belt transmission mechanism (39) comprises a driving wheel (40) mounted on the outer periphery of a sewing machine main shaft (37) and a driven wheel (41) mounted on the outer periphery of a sewing machine lower shaft (38), and a transmission belt (42) is connected between the driven wheel (41) and the driving wheel (40).

6. The button sewing machine according to claim 1, characterized in that: An oil tank (47), an oil pump (48) and a lower diverter valve (49) are arranged in the machine base, an upper diverter valve (50) is arranged in the machine body (1), the oil tank (47) is connected to an oil suction pipe (51), the other end of the oil suction pipe (51) is connected to a three-way valve (52), the outlet of the three-way valve (52) is connected to an oil suction pipe (53), the other end of the oil suction pipe (53) is connected to an oil pump (48), the output end of the oil pump (48) is connected to an oil outlet pipe (54), the oil outlet pipe (54) is connected to the upper end of the upper diverter valve (50), the lower end of the upper diverter valve (50) is respectively connected to an oil inlet sponge (55) and an oil outlet pipe (56), the other end of the oil inlet sponge (55) is connected to the oil outlet pipe (56). One end extends into the machine head to supply oil to the needle rod assembly (45); the lower end of the machine head is connected to an oil return pipe (57); the other end of the oil return pipe (57) is connected to the three-way valve (52); the other end of the oil outlet pipe (56) is connected to the upper end of the lower diverter valve (49); the lower end of the lower diverter valve (49) is respectively connected to an oil inlet sponge (58) and an oil return pipe (59); the other end of the oil inlet sponge (58) extends to the front end of the machine base to supply oil to the hook wire assembly (46); the other end of the oil return pipe (59) is connected to the oil tank (47); the lower end of the machine body (1) is connected to an oil return pipe (60); the other end of the oil return pipe (60) is connected to the oil tank (47).

7. The button sewing machine according to claim 1, characterized in that: The needle bar assembly (45) comprises a needle bar crank (61) arranged at the end of the sewing machine main shaft (37); the eccentric portion of the needle bar crank (61) is connected to a needle bar connecting rod (62); the end of the needle bar connecting rod (62) is provided with a needle bar clamp (63); the needle bar clamp (63) is fixed to the outer periphery of the needle bar (64), thereby driving the needle bar (64) to move reciprocatingly up and down.

8. The button sewing machine according to claim 1, characterized in that: The buckle lifting lever (7) is formed with a wire loosening portion (10), the lower end of the wire loosening driving rod (11) is formed with a wire loosening fork (12) for being pushed by the wire loosening portion (10), the upper end of the wire loosening driving rod (11) is connected with a wire loosening assembly (13), and when the cam (3) rotates along a preset direction by a second angle, the buckle lifting lever (7) pushes the wire loosening driving rod (11) to perform a wire loosening action through the wire loosening assembly (13).

9. The button sewing machine according to claim 8, characterized in that: The wire loosening assembly (13) comprises a wire passing plate (14), a wire passing hole (15) is provided in the wire passing plate (14), a through slot (16) is provided on the machine body (1) for the upper end of the wire loosening driving rod (11) to extend out, a wire passing hole (17) is provided on the upper end of the wire loosening driving rod (11), a wire clamping block (18) and a movable wire plate (19) are respectively provided on the wire passing plate (14), and a wire clamping plate (18) is formed on the movable wire plate (19). 20), a wire passing space (21) is formed between the wire clamping plate (20) and the wire clamping block (18), one end of the movable wire plate (19) is rotatably connected to the machine body (1), a spring is connected between the movable wire plate (19) and the machine body (1) to drive the wire clamping plate (20) to keep moving toward the side close to the wire clamping block (18), and one end of the movable wire plate (19) is formed with a second loosening part (22) for being pushed by the upper end of the loosening driving rod (11).

10. The button sewing machine according to claim 9, characterized in that: The wire-passing plates (14) are respectively arranged on both sides of the through groove (16), and a strip-shaped adjustment hole (23) for a fastener to pass through is opened on the wire-passing plate (14); a convex block (24) for pushing the second wire-loosening part (22) is formed on the upper end of the wire-loosening driving rod (11), and a convex block (25) is formed on the side surface of the second wire-loosening part (22); a rotating shaft (26) is installed in the middle of the wire-clamping block (18), and the wire-clamping block (18) can be rotatably arranged on the wire-passing plate (14).

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