A thread trimming, thread loosening and presser foot lifting mechanism and interlock sewing machine

Abstract

The invention belongs to the technical field of sewing machines, and specifically relates to a thread trimming, thread loosening and presser foot lifting mechanism and a stretch sewing machine, comprising a machine body, a stepping motor and a controller are arranged on one side of the machine body, a driving component is installed on the output shaft of the stepping motor, an arc-shaped lifting part 1 and an arc-shaped lifting part 2 are respectively formed at the upper and lower ends of the driving component, a presser foot action plate and a thread trimming action plate are connected to a rotating support shaft at one end, a presser foot action plate is connected to a presser foot action piece at the other end, a presser foot connecting rod assembly is arranged at one end of the presser foot action piece, a thread trimming driving shaft is connected to one end of the thread trimming driving shaft, a thread trimming connecting rod assembly is connected to the other end of the thread trimming driving shaft, and a thread loosening connecting rod assembly is connected to the other end of the thread trimming driving shaft, and the controller controls the stepping motor to rotate forward or reversely, and drives the presser foot action plate or the thread trimming action plate through the driving component, so as to perform presser foot lifting, thread trimming and thread loosening actions.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, in particular to a thread trimming, thread loosening and presser foot lifting mechanism and a stretch sewing machine. Background Art

[0002] At present, in the sewing machine industry, more and more manufacturers use stepper motors to drive the thread trimmer and presser foot lifting mechanisms. A stepper motor is installed on the back or bottom of the sewing machine, and the forward and reverse rotation of the stepper motor controls the thread trimmer and presser foot lifting mechanisms respectively.

[0003] For example, the Chinese utility model, patent number CN201721423924.8, discloses a thread cutting, thread loosening and presser foot lifting driving device for a stretch sewing machine and a stretch sewing machine, which drives the thread cutting, thread loosening and presser foot lifting actions through only one set of driving devices, thereby reducing the number of parts, simplifying the structure of the driving device, and reducing the weight of the driving device, making it miniaturized and facilitating the installation of the driving device.

[0004] Although this structure is relatively simple, the design of the cam is relatively complex, the overall accessories require high processing accuracy, production is inconvenient, and wear resistance and noise processing are relatively cumbersome. Summary of the invention

[0005] The purpose of the present invention is to provide a thread trimming, thread loosening and presser foot lifting mechanism and a stretch sewing machine, which solves the problems of noise, wear resistance and driving structure in the prior art through the upper and lower arc-shaped lifting parts of the driving member.

[0006] The object of the present invention is achieved in this way: a thread trimming, thread loosening and presser foot lifting mechanism, comprising

[0007] A machine body, a stepper motor and a controller are arranged on one side of the machine body, a driving member is installed on the output shaft of the stepper motor, and arc-shaped lifting part 1 and arc-shaped lifting part 2 are respectively formed at the upper and lower ends of the driving member;

[0008] A presser foot action plate is arranged on one side of the arc-shaped lifting part 1, one end of the presser foot action plate is connected to a presser foot action piece for linear motion, the other end of the presser foot action plate is provided with a pushing part 1 for being pushed by the arc-shaped lifting part 1, and one end of the presser foot action piece is provided with a presser foot connecting rod assembly;

[0009] A thread trimming action plate is arranged on one side of the arc-shaped lifting part 2, one end of the thread trimming action plate is connected to a thread trimming driving shaft for linear motion, the other end of the thread trimming action plate is provided with a pushing part 2 for being pushed by the arc-shaped lifting part 2, one end of the thread trimming driving shaft is connected to a thread trimming connecting rod assembly, and the other end of the thread trimming driving shaft is connected to a thread loosening connecting rod assembly;

[0010] The controller controls the stepper motor to rotate forward or reverse, and drives the presser foot action plate or the thread trimming action plate through the arc-shaped lifting parts at the upper and lower ends of the driving part, so as to perform the actions of lifting the presser foot, trimming the thread, and loosening the thread.

[0011] Preferably, the arc-shaped lifting portion 1 and the arc-shaped lifting portion 2 face opposite sides respectively, the end faces of the arc-shaped lifting portion 1 and the arc-shaped lifting portion 2 are formed with lifting curved surfaces, and one end of the arc-shaped lifting portion 1 and the arc-shaped lifting portion 2 is formed with a limiting hook portion.

[0012] Preferably, the presser foot actuating member can be linearly moved and sleeved on the fixed shaft, a pushing part three is installed on one side of the presser foot actuating member, the presser foot connecting rod assembly includes a presser foot moving plate rotatably installed on the machine body, a pushing part four is formed at the lower end of the presser foot moving plate, and the pushing part four is located on the movement trajectory of the pushing part three.

[0013] Preferably, the fixed shaft is installed in the mounting seat, a sliding sleeve 1 is arranged between the presser foot actuator and the fixed shaft, two rolling bearings 3 are installed on the pushing part 3, a linear cavity 2 is opened on the side of the mounting seat, one of the rolling bearings 3 is arranged in the linear cavity 2 to enable the presser foot actuator to maintain linear motion, and the other rolling bearing 3 is located on one side of the pushing part 4.

[0014] Preferably, one end of the thread trimming action plate is connected to a fixing piece, the fixing piece is fixedly connected to the thread trimming drive shaft, and the thread trimming drive shaft can be installed in the mounting seat for linear motion.

[0015] Preferably, a rolling bearing four is installed on one side of the fixing member, a linear cavity one is opened on the side of the mounting seat, and the rolling bearing four is arranged in the linear cavity one to enable the thread trimming drive shaft to maintain linear motion.

[0016] Preferably, the presser foot action plate and the thread trimmer action plate are respectively in the shape of an arc, one end of the presser foot action plate is hinged to the presser foot action piece, one end of the thread trimmer action plate is hinged to the fixing piece, the other end of the presser foot action plate is connected to a rotating support shaft, the other end of the thread trimmer action plate is connected to a rotating support shaft, the middle end of the presser foot action plate is provided with a pushing part 1 for being pushed by the arc-shaped lifting part 1, and the middle end of the thread trimmer action plate is provided with a pushing part 2 for being pushed by the arc-shaped lifting part 2.

[0017] Preferably, the presser foot action plate and the thread trimmer action plate are respectively L-shaped, and the pushing portion 1 and the pushing portion 2 are respectively located on both sides of the driving member.

[0018] Preferably, a rolling bearing 1 is installed on the pushing part 1, and a rolling bearing 2 is installed on the pushing part 2; a mounting seat is installed on one side of the body, and the mounting seat is located at the lower end surface of the motor, and the rotating support shaft is vertically installed in the mounting seat, a cushion sleeve 1 is arranged between the thread trimming action plate and the lower end surface of the mounting seat, a cushion sleeve 2 is arranged between the presser foot action plate and the upper end surface of the mounting seat, and a cushion sleeve 3 is arranged between the thread trimming action plate and the presser foot action plate; a reset spring is arranged between the fixing member and the mounting seat, a sliding sleeve 2 is arranged between the thread trimming drive shaft and the mounting seat, and a buffer washer 1 and a buffer washer 2 are installed on the thread trimming drive shaft, and the buffer washer 1 and the buffer washer 2 are respectively located on both sides of the mounting seat; a rotating bearing is arranged between the lower end of the output shaft and the mounting seat, and a top sleeve is installed between the rotating bearing and the driving member; a sensing part is formed at the lower end of the fixing member, and a magnet is arranged in the sensing part, and a sensor for detecting the magnet is installed on the body, the sensor is connected to the controller, and the sensor is located at the reset position of the fixing member.

[0019] A flat sewing machine comprises a machine body, on which a thread cutting assembly, a thread loosening assembly and a presser foot lifting assembly are respectively installed.

[0020] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0021] Through the design of the driving part, the present invention controls the stepping motor to rotate forward or reverse through the controller during the actual working process, and drives the presser foot action plate to move through the arc-shaped lifting part of the driving part to perform the presser foot lifting action, or drives the thread cutting action plate to move through the arc-shaped lifting part of the driving part to perform the thread cutting and loosening actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention.

[0023] Figure 2 The figure is a schematic diagram of the structure of the present invention with the cover shell removed.

[0024] Figure 3 A schematic diagram of the structure of the mounting base.

[0025] Figure 4 Schematic diagram of the structure of the thread trimming, thread loosening and presser foot lifting mechanism Figure 1 .

[0026] Figure 5 Schematic diagram of the structure of the thread trimming, thread loosening and presser foot lifting mechanism Figure 2 .

[0027] Figure 6 The structure diagram of the drive unit, presser foot action plate, and thread trimmer action plate Figure 1 .

[0028] Figure 7 The structure diagram of the drive unit, presser foot action plate, and thread trimmer action plate Figure 2 .

[0029] Figure 8 The structure diagram of the drive unit, presser foot action plate, and thread trimmer action plate Figure 3 .

[0030] Fig. 9 It is a schematic diagram of the structure of the thread trimming action plate and the presser foot action plate.

[0031] Reference numerals: 1-machine body; 2-stepping motor; 3-output shaft; 4-driving member;

[0032] 4a-arc lifting part 1; 4b-arc lifting part 2; 4c-lifting curved surface; 4d-limiting hook; 5-presser foot action plate; 5a-pushing part 1; 6-thread trimming action plate; 6a-pushing part 2;

[0033] 7-rotating support shaft; 8-presser foot actuating member; 8a-pushing part three; 9-presser foot connecting rod assembly; 9a-presser foot moving plate; 9b-pushing part four; 10-thread trimming drive shaft; 11-thread trimming connecting rod assembly; 12-thread loosening connecting rod assembly;

[0034] 13-rolling bearing one; 14-rolling bearing two; 15-connecting rod one; 16-fixed shaft; 19-mounting seat; 19a-linear cavity two; 19b-linear cavity one; 21-rolling bearing three; 22-connecting rod two; 23-fixing piece; 23a-sensing part; 24-rolling bearing four; 25-magnet; 26-sensor; 27-washer sleeve one; 28-washer sleeve two; 29-washer sleeve three; 30-reset spring; 31-sliding sleeve two; 32-buffer washer one; 33-buffer washer two; 34-rotating bearing; 35-top sleeve; 36-arc groove one; 37-arc groove two; 38-pin shaft one; 39-pin shaft two. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1:

[0037] A thread trimming, thread loosening and presser foot lifting mechanism, comprising

[0038] A machine body 1, a stepper motor 2 and a controller are arranged on one side of the machine body 1, a driving member 4 is mounted on an output shaft 3 of the stepper motor 2, and an arc-shaped lifting portion 1 4a and an arc-shaped lifting portion 2 4b are formed at the upper and lower ends of the driving member 4 respectively;

[0039] A presser foot action plate 5, which is arc-shaped and is arranged on one side of the arc-shaped lifting portion 4a, one end of the presser foot action plate 5 is connected to a rotation support shaft 7, the other end of the presser foot action plate 5 is connected to a presser foot action piece 8, a pushing portion 5a for the arc-shaped lifting portion 4a to push is arranged at the middle end of the presser foot action plate 5, and a presser foot connecting rod assembly 9 is arranged at one end of the presser foot action piece 8;

[0040] A thread trimming action plate 6, which is arc-shaped and is arranged on one side of the arc-shaped lifting portion 4b, one end of the thread trimming action plate 6 is connected to a rotation support shaft 7, the other end of the thread trimming action plate 6 is connected to a thread trimming drive shaft 10, a pushing portion 6a for the arc-shaped lifting portion 4b to push is arranged at the middle end of the thread trimming action plate 6, one end of the thread trimming drive shaft 10 is connected to a thread trimming connecting rod assembly 11, and the other end of the thread trimming drive shaft 10 is connected to a thread loosening connecting rod assembly 12;

[0041] In the actual working process, the controller controls the stepper motor 2 to rotate forward or reverse, and the arc-shaped lifting part 1 4a of the driving member 4 drives the presser foot action plate 5 to move, thereby performing the presser foot lifting action, or the arc-shaped lifting part 2 4b of the driving member 4 drives the thread cutting action plate 6 to move, thereby performing the thread cutting and loosening actions.

[0042] Look specifically Figure 6 The arc-shaped lifting portion 1 4a and the arc-shaped lifting portion 2 4b are left-handed lifting and right-handed lifting respectively, and the arc-shaped lifting portion 1 4a and the arc-shaped lifting portion 2 4b are facing opposite sides respectively. The end faces of the arc-shaped lifting portion 1 4a and the arc-shaped lifting portion 2 4b are formed with a lifting curved surface 4c, and the lifting curved surface 4c is an arc-shaped surface. The end face height of the lifting curved surface 4c at the end point is higher than the end face height at the starting point. Therefore, when the rolling bearings 13 and 14 move from the starting point to the end point of the lifting curved surface 4c, the action plates 5 and 6 will be driven to move.

[0043] Look specifically Figure 6 A limiting hook 4d is formed at one end of the arc-shaped lifting portion 1 4a and the arc-shaped lifting portion 2 4b. When the output shaft of the stepper motor drives the driving member to rotate clockwise, the lifting surface 4c of the pushing portion 2 6a on the arc-shaped lifting portion 2 4b moves. When the output shaft of the stepper motor drives the driving member to rotate counterclockwise, the lifting surface 4c of the pushing portion 1 5a on the arc-shaped lifting portion 1 4a moves. The limiting hook 4d has a limiting function. When the pushing portion 1 5a is located at the end of the lifting surface 4c on the arc-shaped lifting portion 1 4a, the limiting hook 4d of the arc-shaped lifting portion 1 4b abuts against one side end face of the pushing portion 2 6a, thereby realizing the limiting function.

[0044] Look specifically Figure 6A rolling bearing 13 is installed on the pushing part 1 5a, and a rolling bearing 14 is installed on the pushing part 2 6a. The rolling bearing 13 and the rolling bearing 14 move on the end surface of the lifting surface 4c respectively. The design of the rolling bearing can reduce friction and extend the service life.

[0045] Look specifically Fig. 9 The pushing portion can be a protruding part formed on the side of the presser foot action plate or the thread trimming action plate, so there is no need to install a rolling bearing 13, and the structure is simpler.

[0046] Combination Figure 5 and Figure 6 One end of the presser foot action plate 5 is hinged to the presser foot action piece 8 through a connecting rod 15. By adjusting the position angle of the hinge point, the installation angle of the presser foot action plate 5 can be adjusted. The presser foot action piece 8 can be linearly moved and sleeved on the fixed shaft 16, so as to ensure that the presser foot action piece 8 can move linearly. A pushing part 3 8a is installed on one side of the presser foot action piece 8. The presser foot connecting rod assembly 9 includes a presser foot moving plate 9a rotatably mounted on the machine body 1. A pushing part 4 9b is formed at the lower end of the presser foot moving plate 9a. The pushing part 4 9b is located on the movement trajectory of the pushing part 3 8a. When the presser foot action piece 8 moves linearly, the pushing part 4 9b will be pushed by the pushing part 3 8a, thereby moving the presser foot moving plate 9a to perform the presser foot lifting action.

[0047] Combination Figure 3 and Figure 4 The fixed shaft 16 is installed in the mounting seat 19, and a sliding sleeve 1 is arranged between the presser foot action piece 8 and the fixed shaft 16 to reduce friction and facilitate sliding. Two rolling bearings 3 21 are installed on the pushing part 3 8a. A linear cavity 2 19a is opened on the side of the mounting seat 19, one of the rolling bearings 3 21 is arranged in the linear cavity 2 19a to keep the presser foot action piece 8 in linear motion, and the other rolling bearing 3 21 is located on one side of the pushing part 4 9b, and is used to push the pushing part 4 9b during the movement of the presser foot action piece 8.

[0048] Combination Figure 2 and Figure 6 One end of the thread trimming action plate 6 is hinged with a fixing part 23 through a connecting rod 22. By adjusting the position angle of the hinge point, the installation angle of the thread trimming action plate 6 can be adjusted. The fixing part 23 is fixedly connected to the thread trimming drive shaft 10. The thread trimming drive shaft 10 can be installed in a linear motion in the mounting seat 19. The thread trimming drive shaft 10 is driven by the fixing part 23 to move to perform the thread trimming action.

[0049] Look specifically Figure 3A rolling bearing 24 is installed on one side of the fixing member 23, and a linear cavity 19b is opened on the side of the mounting seat 19. The rolling bearing 24 is arranged in the linear cavity 19b to keep the thread trimming drive shaft 10 in linear motion.

[0050] Look specifically Figure 4 A sensing portion 23a is formed at the lower end of the fixing member 23, and a magnet 25 is arranged in the sensing portion 23a. A sensor 26 for detecting the magnet 25 is installed on the body 1. The sensor 26 is connected to the controller and is located at the reset position of the fixing member 23. The sensor 26 is used to detect the position of the fixing member 23, so as to detect whether the scissors assembly is reset. When the scissors assembly is not detected to be reset, the electronic control suspends the operation of the motor and issues an alarm.

[0051] Combination Figure 1 A cover is installed on the outer periphery of the motor and the mounting seat 19. Figure 2 A mounting seat 19 is installed on one side of the body 1, and the mounting seat 19 is located at the lower end surface of the motor. The rotating support shaft 7 is vertically installed in the mounting seat 19. The design of the rotating support shaft 7 facilitates the support and rotation of the presser foot action plate 5 and the thread trimming action plate 6.

[0052] Combination Figure 2 and Figure 5 A cushion sleeve 27 is provided between the thread trimming action plate 6 and the lower end surface of the mounting seat 19, a cushion sleeve 28 is provided between the presser foot action plate 5 and the upper end surface of the mounting seat 19, and a cushion sleeve 3 29 is provided between the thread trimming action plate 6 and the presser foot action plate 5. The distance between the components is separated by the cushion sleeves to prevent interference and reduce friction, so as to facilitate their rotation.

[0053] Combination Figure 3 and Figure 4 A reset spring 30 is arranged between the fixing member 23 and the mounting seat 19 for resetting the thread trimming assembly. A sliding sleeve 2 31 is arranged between the thread trimming drive shaft 10 and the mounting seat 19. A buffer washer 1 32 and a buffer washer 2 33 are installed on the thread trimming drive shaft 10. The buffer washer 1 32 and the buffer washer 2 33 are respectively located on both sides of the mounting seat 19 to reduce impact force, reduce wear and extend service life; a rotating bearing 34 is arranged between the lower end of the output shaft 3 and the mounting seat 19 to improve the stability of the output shaft 3 during rotation, and a top sleeve 35 is installed between the rotating bearing 34 and the driving member 4 to further fix the installation position of the driving member 4.

[0054] A flat sewing machine adopts the thread trimming, thread loosening and presser foot lifting mechanism of the present invention, comprising a machine body 1, on which a thread trimming assembly, a thread loosening assembly and a presser foot lifting assembly are respectively installed, a thread trimming connecting rod assembly 11 comprises a thread trimming driving shaft 10, one end of which is connected to the thread trimming assembly and is used to perform the thread trimming action; a thread loosening connecting rod assembly 12 comprises a thread loosening connecting plate, the thread loosening connecting plate is connected to a thread loosening crank, the thread loosening crank is connected to the thread loosening assembly and is used to perform the thread loosening action; a presser foot connecting rod assembly 9 comprises a presser foot movable plate 9a rotatably mounted on the machine body 1, the presser foot movable plate 9a is connected to a presser foot plate through a presser foot hook, the presser foot plate is connected to a presser foot shaft, one end of the presser foot shaft is connected to a presser foot lifting assembly and is used to perform the presser foot lifting action.

[0055] Embodiment 2: The structure and principle of this embodiment are basically the same as those of Embodiment 1, and the difference lies in that: an arc groove 36 is formed on the presser foot actuating member 8, and a pin shaft 38 is installed at one end of the presser foot actuating plate 5, and the pin shaft 38 is rotatably and movably arranged in the arc groove 36, so that the presser foot actuating plate 5 and the presser foot actuating member 8 are hingedly connected; an arc groove 2 37 is formed on the fixing member 23, and a pin shaft 2 39 is installed at one end of the thread trimming action plate 6, and the pin shaft 2 39 is rotatably and movably arranged in the arc groove 2 37, so that the thread trimming action plate 6 and the fixing member 23 are hingedly connected. This embodiment does not need to install the connecting rod 15 and the connecting rod 22, thereby reducing the number of components and reducing costs.

[0056] Embodiment 3: The structure and principle of this embodiment are basically the same as those of Embodiment 1, except that: the shapes of the presser foot action plate 5 and the thread trimmer action plate 6 are respectively L-shaped, one end of the presser foot action plate 5 is fixedly connected to or integrally formed with the presser foot action member 8, one end of the thread trimmer action plate 6 is fixedly connected to or integrally formed with the fixing member 23, the pushing portion 1 5a and the pushing portion 2 6a are respectively arranged at the other ends of the presser foot action plate 5 and the thread trimmer action plate 6, the pushing portion 1 5a and the pushing portion 2 6a are respectively located on both sides of the driving member 4, and there is no need to install the rotating support shaft 7. This embodiment does not need to install the rotating support shaft 7, the connecting rod 1 15 and the connecting rod 2 2, thereby reducing the number of components and reducing costs.

[0057] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A thread trimming, thread loosening and presser foot lifting mechanism, characterized in that: include A machine body (1), a stepper motor (2) and a controller are arranged on one side of the machine body (1), a driving member (4) is mounted on an output shaft (3) of the stepper motor (2), and an arc-shaped lifting portion 1 (4a) and an arc-shaped lifting portion 2 (4b) are respectively formed at upper and lower ends of the driving member (4); A presser foot action plate (5) is arranged on one side of the arc-shaped lifting portion (4a); one end of the presser foot action plate (5) is connected to a presser foot action member (8) that moves linearly; the other end of the presser foot action plate (5) is provided with a pushing portion (5a) for being pushed by the arc-shaped lifting portion (4a); and one end of the presser foot action member (8) is provided with a presser foot connecting rod assembly (9); A thread trimming action plate (6) is arranged on one side of the arc-shaped lifting portion (4b); one end of the thread trimming action plate (6) is connected to a thread trimming driving shaft (10) for linear motion; the other end of the thread trimming action plate (6) is provided with a pushing portion (6a) for being pushed by the arc-shaped lifting portion (4b); one end of the thread trimming driving shaft (10) is connected to a thread trimming connecting rod assembly (11); and the other end of the thread trimming driving shaft (10) is connected to a thread loosening connecting rod assembly (12); The controller controls the stepping motor (2) to rotate forward or reverse, and drives the presser foot action plate (5) or the thread trimming action plate (6) through the arc-shaped lifting parts at the upper and lower ends of the driving member (4), thereby performing the presser foot lifting, thread trimming and thread loosening actions; the arc-shaped lifting part 1 (4a) and the arc-shaped lifting part 2 (4b) are respectively facing opposite sides, and the end surfaces of the arc-shaped lifting part 1 (4a) and the arc-shaped lifting part 2 (4b) are formed with a lifting curved surface (4c), and one end of the arc-shaped lifting part 1 (4a) and the arc-shaped lifting part 2 (4b) is formed with a limited position hook part (4d); one end of the thread trimming action plate (6) is connected to a fixing member (23), and the fixing member (23) is fixedly connected to the thread trimming drive shaft (10) , the thread trimming driving shaft (10) can be linearly moved and installed in the mounting seat (19); the shapes of the presser foot action plate (5) and the thread trimming action plate (6) are arc-shaped respectively, one end of the presser foot action plate (5) is hinged to the presser foot action member (8), one end of the thread trimming action plate (6) is hinged to the fixing member (23), the other end of the presser foot action plate (5) is connected to the rotation support shaft (7), the other end of the thread trimming action plate (6) is connected to the rotation support shaft (7), the middle end of the presser foot action plate (5) is provided with a pushing part 1 (5a) for being pushed by the arc-shaped lifting part 1 (4a), and the middle end of the thread trimming action plate (6) is provided with a pushing part 2 (6a) for being pushed by the arc-shaped lifting part 2 (4b).

2. The thread trimming, thread loosening and presser foot lifting mechanism according to claim 1, characterized in that: The presser foot moving member (8) is sleeved on the fixed shaft (16) in a linear motion manner, a pushing portion three (8a) is installed on one side of the presser foot moving member (8), the presser foot connecting rod assembly (9) comprises a presser foot moving plate (9a) rotatably installed on the machine body (1), a pushing portion four (9b) is formed at the lower end of the presser foot moving plate (9a), and the pushing portion four (9b) is located on the motion track of the pushing portion three (8a).

3. The thread trimming, thread loosening and presser foot lifting mechanism according to claim 2, characterized in that: The fixed shaft (16) is installed in the mounting seat (19), a sliding sleeve (1) is arranged between the presser foot action piece (8) and the fixed shaft (16), two rolling bearings (21) are installed on the pushing part (8a), a linear cavity (19a) is opened on the side of the mounting seat (19), one rolling bearing (21) is arranged in the linear cavity (19a) to enable the presser foot action piece (8) to maintain linear motion, and the other rolling bearing (21) is located on one side of the pushing part (9b).

4. The thread trimming, thread loosening and presser foot lifting mechanism according to claim 1, characterized in that: A rolling bearing four (24) is installed on one side of the fixing member (23), and a linear cavity one (19b) is opened on the side of the mounting seat (19), and the rolling bearing four (24) is arranged in the linear cavity one (19b) to enable the thread cutting drive shaft (10) to maintain linear motion.

5. The thread trimming, thread loosening and presser foot lifting mechanism according to claim 1, characterized in that: The presser foot action plate (5) and the thread trimmer action plate (6) are both L-shaped, and the push part 1 (5a) and the push part 2 (6a) are respectively located on both sides of the driving member (4).

6. The thread trimming, thread loosening and presser foot lifting mechanism according to claim 1, characterized in that: A rolling bearing 1 (13) is installed on the pushing part 1 (5a), and a rolling bearing 2 (14) is installed on the pushing part 2 (6a); a mounting seat (19) is installed on one side of the body (1), and the mounting seat (19) is located at the lower end surface of the motor. The rotating support shaft (7) is vertically installed in the mounting seat (19); a cushion sleeve 1 (27) is arranged between the thread trimming action plate (6) and the lower end surface of the mounting seat (19); a cushion sleeve 2 (28) is arranged between the presser foot action plate (5) and the upper end surface of the mounting seat (19); and a cushion sleeve 3 (29) is arranged between the thread trimming action plate (6) and the presser foot action plate (5); a reset spring (30) is arranged between the fixing member (23) and the mounting seat (19); and the thread trimming drive shaft (10) and the mounting seat are arranged at the same time. (19), a sliding sleeve (31) is arranged between the output shaft (3) and the mounting seat (19), a buffer washer (32) and a buffer washer (33) are installed on the thread trimming drive shaft (10), and the buffer washer (32) and the buffer washer (33) are respectively located on both sides of the mounting seat (19); a rotating bearing (34) is arranged between the lower end of the output shaft (3) and the mounting seat (19), and a top sleeve (35) is installed between the rotating bearing (34) and the driving member (4); a sensing part (23a) is formed at the lower end of the fixing member (23), and a magnet (25) is arranged in the sensing part (23a); a sensor (26) for detecting the magnet (25) is installed on the machine body (1), and the sensor (26) is connected to the controller, and the sensor (26) is located at the reset position of the fixing member (23).

7. A flat sewing machine, characterized in that: The thread trimming, thread loosening and presser foot lifting mechanism according to any one of claims 1 to 6 comprises a machine body (1), on which a thread trimming assembly, a thread loosening assembly and a presser foot lifting assembly are respectively mounted.

Images