Double-shaft stepping motor driving structure of flat seaming machine

Abstract

The utility model discloses a double-shaft stepping motor driving structure of a flat seaming machine, which comprises a stepping motor, a power output shaft of the stepping motor is provided with double output ends, one end of the power output shaft is connected with a presser foot lifting transmission shaft through a rear shaft cam, and the presser foot lifting transmission shaft is used for executing presser foot lifting actions. The other end of the power output shaft is connected with a thread trimming transmission shaft and a thread loosening transmission shaft through a front shaft cam, the thread trimming transmission shaft is connected with a thread trimming device used for executing thread trimming action, and the thread loosening transmission shaft is connected with a thread loosening device used for executing thread loosening action. A longitudinal single-shaft motor is changed into the transverse double-shaft motor, one end of the power output shaft is connected with the presser foot lifting device, the other end of the power output shaft is connected with the thread loosening and trimming device, the stepping motor can drive the presser foot rod to move when rotating and can drive the thread loosening and trimming device when rotating reversely, the driving structure is more compact, the requirement for the installation space is reduced, and cost is reduced. And the operation efficiency and stability of a mechanical system are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and particularly to a dual-axis stepping motor drive structure for an overlock sewing machine. Background Art

[0002] The overlock sewing machine is also known as a special sewing machine. It uses sewing thread to form one or more stitches on the sewing material, and interweaves or stitches multiple layers of sewing materials together. With the improvement of the mechanization degree of clothing manufacturing, various types of sewing machines are generally equipped with an automatic thread cutting mechanism for cutting the thread after sewing and an automatic presser foot lifting mechanism for lifting the presser foot before and after sewing, etc., to enrich the functions of the overlock sewing machine.

[0003] At present, the thread cutting and presser foot lifting actions of the overlock sewing machine consist of two parts, and most machines use a single-axis stepping motor to realize the functions of lifting the presser foot and cutting the thread. Summary of the Invention

[0004] Aiming at the technical problems in the prior art that the motor drives the presser foot lifting, thread cutting, and thread loosening unstably, and the installation space of the overlock sewing machine is small, the utility model provides a dual-axis stepping motor drive structure for an overlock sewing machine, which realizes the automatic thread cutting, thread loosening, and presser foot lifting actions of the overlock sewing machine. By improving the motor installation structure and transmission structure, the operation stability is improved, and it has the advantages of simple operation, compact structure, and reduced installation space.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows: a dual-axis stepping motor drive structure for an overlock sewing machine, including a stepping motor. The power output shaft of the stepping motor has a dual output end. One end of the power output shaft is connected to a presser foot drive shaft for performing the presser foot lifting action through a rear shaft cam, and the other end of the power output shaft is connected to a thread cutting drive shaft and a thread loosening drive shaft through a front shaft cam. The thread cutting drive shaft is connected to a thread cutting device for performing the thread cutting action, and the thread loosening drive shaft is connected to a thread loosening device for performing the thread loosening action.

[0006] To optimize the above technical solution, the utility model further includes the following improved technical solutions.

[0007] A rotatable front shaft drive handle is provided on one side of the above stepping motor. One end of the front shaft drive handle is connected to the thread cutting drive shaft through a front shaft connecting rod and a transmission plate, and the other end is installed with a first roller cooperating with the front shaft cam.

[0008] A rotatable thread loosening drive shaft is installed in the sewing machine head. One end of the thread loosening drive shaft is connected to the thread loosening device through a thread loosening connecting rod, and the other end is fixedly connected to a thread loosening drive handle; the thread cutting drive shaft is movably connected to the thread loosening drive handle through a thread loosening connecting rod.

[0009] The above-mentioned thread-cutting transmission shaft is installed on the mounting base of the stepper motor, passes through the second lug and the first lug in sequence, and is fixedly connected to the thread-loosening connecting block at the rear end. The thread-loosening connecting rod is fixedly installed on the thread-loosening connecting block; the thread-loosening spring is sleeved on the thread-cutting transmission shaft and is located between the thread-cutting hoop and the first lug.

[0010] The sewing machine head is rotatably installed with a cam drive plate. A second roller is rotatably installed at the lower end of the cam drive plate. The second roller cooperates with the rear shaft cam. The upper end of the cam drive plate is connected to the presser foot drive plate on the presser foot transmission shaft through a presser foot lifting connecting rod.

[0011] The above-mentioned presser foot transmission shaft is rotatably installed in the sewing machine head. One end of the presser foot transmission shaft is connected to the presser foot lever through a connecting rod and a sliding rod. The other end of the presser foot transmission shaft is fixedly connected to the presser foot drive plate through a presser foot drive block.

[0012] The above-mentioned presser foot transmission shaft is sleeved with a presser foot spring for resetting.

[0013] Compared with the prior art, the dual-axis stepper motor drive structure of the present utility model changes the longitudinal single-axis motor into a transverse dual-axis motor. One end of the power output shaft is connected to the presser foot device, and the other end is connected to the thread-loosening and thread-cutting device. When the stepper motor rotates, it can drive the presser foot lever to move. When rotating in the reverse direction, it can drive the thread-cutting and thread-loosening device. The drive structure is more compact, reducing the installation space requirements, and greatly improving the efficiency and stability of the mechanical system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic three-dimensional structure diagram of an embodiment of the present utility model.

[0015] Figure 2 is a schematic overall structure diagram of another perspective of an embodiment of the present utility model.

[0016] Figure 3 is a schematic exploded three-dimensional structure diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further describes the embodiments of the present utility model in detail with reference to the drawings.

[0018] Figures 1 to 3 Shown is a schematic structure diagram of the present utility model.

[0019] The accompanying drawings are marked as follows: heightening block 1, front axle driving handle 2, front axle cam 3, fixing column 4, front axle connecting rod 5, loose shear spring 6, loose wire connecting block 7, stepping motor 8, loose wire connecting rod 9, loose wire driving handle 10, loose wire transmission shaft 11, loose wire connecting rod 12, presser foot lifting driving block 13, presser foot lifting transmission plate 14, foot lifting connecting rod 15, presser foot lifting spring 16, cam transmission plate 17, presser foot lifting transmission shaft 18, connecting rod 19, sliding bar 20, presser foot rod 21, thread trimming transmission shaft 22, pin 23, rear axle cam 24, first roller 25, first axial screw 26, second axial screw 27, transmission plate 28, thread trimming clamp 29, thread trimming clamp 30, first lug 31, second lug 32, second roller 33, fourth axial screw 34, cam spring 35, third axial screw 36, mounting seat 37.

[0020] The double-axis stepper motor driving structure of the interlock sewing machine of the utility model comprises a stepper motor 8, a front shaft cam 3 and a rear shaft cam 24. One end of the power output shaft of the stepper motor 8 is connected to the presser foot lifting transmission shaft 18 through the rear shaft cam 24, and is responsible for performing the presser foot lifting action. The other end of the power output shaft is connected to the thread trimming transmission shaft 22 and the thread loosening transmission shaft 11 through the front shaft cam 3, and respectively performs the thread trimming action of the thread trimming device and the thread loosening action of the thread loosening device.

[0021] like Figure 1 , Figure 3 The mounting seat 37 of the stepper motor 8 shown in the figure fixes the heightening block 1 through the fixing column 4, and the heightening block 1 is provided with a rotatable front axle driving handle 2. The middle part of the front axle driving handle 2 is rotatably connected to the heightening block 1 through a first rotating shaft, one end of the front axle driving handle 2 is fixedly connected to the front axle connecting rod 5 through a screw, and the other end is provided with a first roller 25 matched with the front axle cam 3.

[0022] When the stepper motor 8 rotates, the power output shaft drives the front axle cam 3 to rotate, and the front axle cam 3 moves the first roller 25 through the cam surface, so that the front axle connecting rod 5 rotates around the first rotating shaft.

[0023] The front axle connecting rod 5 is rotatably connected to one end of the transmission plate 28 through the first axial screw 26, and the other end of the transmission plate 28 is rotatably connected to the wire trimmer clamp 29 through the second axial screw 27. The wire trimmer clamp 29 is mounted on the wire trimmer transmission shaft 22. The wire trimmer transmission shaft 22 is mounted on the mounting seat 37 of the stepper motor 8, and passes through the second lug 32 and the first lug 31 in sequence and is finally fixedly connected to the wire loosening connection block 7. The loosening spring 6 is sleeved on the wire trimmer transmission shaft 22 and is located between the wire trimmer clamp 30 and the first lug 31.

[0024] The front axle connecting rod 5 drives the transmission plate 28 to move through the first axial screw 26, and the transmission plate 28 drives the thread trimmer clamp 29 to move axially along the thread trimmer transmission shaft 22 through the second axial screw 27. The front end of the thread trimmer transmission shaft 22 is connected to the thread trimmer device. When the front axle cam 3 drives the thread trimmer transmission shaft 22 to move axially backward, the thread trimmer device realizes the thread trimming function. After the thread trimming is completed, the thread trimmer transmission shaft 22 is reset by the loosening spring 6 to return to its original position.

[0025] A thread loosening transmission shaft 11 is installed in the sewing machine head, one end of which is connected to the thread loosening device through a thread loosening connecting rod 12, and the other end is fixedly connected to the thread loosening driving handle 10. Figure 3 The upper end of the wire loosening connection block 7 is connected to the wire loosening connection rod 9 by means of screws. A long groove is formed at the upper end of the wire loosening connection rod 9. The long groove is slidably connected to the wire loosening driving handle 10 by means of a third axial screw 36.

[0026] The thread trimming transmission shaft 22 and the thread loosening connection block 7 move axially backward together, and the thread loosening connection block 7 drives the thread loosening connection rod 9 to move in the same direction. When the thread loosening connection rod 9 moves, it drives the thread loosening driving handle 10 and the thread loosening transmission shaft 11 to rotate together, and the thread loosening transmission shaft 11 drives the thread loosening connecting rod 12 to rotate, and the thread loosening device realizes the thread loosening function. After the thread loosening is completed, the thread loosening device drives the thread loosening transmission shaft 11 to reset through the shear loosening spring 6.

[0027] like Figure 2 , Figure 3 The sewing machine head shown is rotatably mounted with a cam transmission plate 17 through a fourth axial screw 34, and a cam spring 35 is mounted on the fourth axial screw 34. After the cam transmission plate 17 is rotated, the cam spring 35 can be used to reset. The lower end of the cam transmission plate 17 is rotatably mounted with a second roller 33 through a pin 23, and the second roller 33 cooperates with the rear shaft cam 24. The upper end of the cam transmission plate 17 is connected to the presser foot lifting transmission plate 14 through a presser foot lifting connecting rod 15. One end of the power output shaft of the stepping motor 8 drives the rear shaft cam 24 to rotate, and the rear shaft cam 24 moves the second roller to rotate the cam transmission plate 17.

[0028] A rotatable presser foot lifting transmission shaft 18 is installed in the sewing machine head, one end of which is fixedly connected to a connecting rod 19, and the other end of which is fixedly connected to a presser foot lifting driving block 13. A presser foot lifting transmission plate 14 is fixedly installed on the presser foot lifting transmission shaft 18 and connected to the presser foot lifting driving block 13. A spring is connected to the presser foot lifting transmission plate 14 on the presser foot lifting transmission shaft 18. A presser foot rod 21 that can move up and down is installed in the sewing machine head, and the presser foot rod 21 is movably connected to one end of a slide bar 20, and the other end of the slide bar 20 is rotatably connected to the connecting rod 19.

[0029] The cam drive plate 17 drives the presser foot drive plate 14 and the presser foot drive shaft 18 to rotate together around the axis of the presser foot drive shaft 18 through the presser foot lifting connecting rod 15. The presser foot drive shaft 18 drives the presser foot rod 21 to move up and down through the connecting rod 19 and the slide rod 20, realizing the function of lifting the presser foot. After the presser foot is lifted, the presser foot device drives the presser foot drive shaft 18 to reset through the presser foot spring 16 and the cam spring 35.

[0030] The front axle drive handle 2 can be installed on the heightening block 1 or directly on the housing of the stepper motor 8.

[0031] The best embodiments of the present invention have been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present invention.

Claims

1. A double-axis stepper motor driving structure for a flat sewing machine, comprising a stepper motor (8), characterized in that: The power output shaft of the stepper motor (8) has two output ends, one end of the power output shaft is connected to a presser foot lifting transmission shaft (18) for performing a presser foot lifting action through a rear shaft cam (24), and the other end of the power output shaft is connected to a thread trimming transmission shaft (22) and a thread loosening transmission shaft (11) through a front shaft cam (3), the thread trimming transmission shaft (22) is connected to a thread trimming device for performing a thread trimming action, and the thread loosening transmission shaft (11) is connected to a thread loosening device for performing a thread loosening action.

2. The dual-axis stepper motor drive structure according to claim 1, characterized in that: A rotatable front axle driving handle (2) is provided on one side of the stepper motor (8); one end of the front axle driving handle (2) is connected to the thread trimmer transmission shaft (22) via a front axle connecting rod (5) and a transmission plate (28); and the other end is provided with a first roller (25) that cooperates with the front axle cam (3).

3. The dual-axis stepper motor drive structure according to claim 2, characterized in that: A rotatable thread loosening transmission shaft (11) is installed in the sewing machine head. One end of the thread loosening transmission shaft (11) is connected to the thread loosening device through a thread loosening connecting rod (12), and the other end is fixedly connected to the thread loosening driving handle (10); the thread cutting transmission shaft (22) is movably connected to the thread loosening driving handle (10) through a thread loosening connecting rod (9).

4. The dual-axis stepper motor driving structure according to claim 3 is characterized in that: The thread trimmer transmission shaft (22) is mounted on a mounting seat (37) of a stepper motor (8), and passes through a second lug (32) and a first lug (31) in sequence, and a rear end is fixedly connected to a thread loosening connection block (7), and the thread loosening connection rod (9) is fixedly mounted on the thread loosening connection block (7); a thread loosening spring (6) is sleeved on the thread trimmer transmission shaft (22) and is located between a thread trimmer clamp (30) and the first lug (31).

5. The dual-axis stepper motor driving structure according to claim 1 is characterized in that: A cam transmission plate (17) is rotatably mounted on the sewing machine head, a second roller (33) is rotatably mounted on the lower end of the cam transmission plate (17), the second roller (33) cooperates with a rear shaft cam (24), and the upper end of the cam transmission plate (17) is connected to a presser foot lifting transmission plate (14) on a presser foot lifting transmission shaft (18) through a presser foot lifting connecting rod (15).

6. The dual-axis stepper motor driving structure according to claim 5 is characterized in that: The presser foot lifting transmission shaft (18) is rotatably mounted in the sewing machine head, one end of the presser foot lifting transmission shaft (18) is connected to the presser foot rod (21) through a connecting rod (19) and a sliding rod (20), and the other end of the presser foot lifting transmission shaft (18) is fixedly connected to the presser foot lifting transmission plate (14) through a presser foot lifting driving block (13).

7. The dual-axis stepper motor driving structure according to claim 6 is characterized in that: The presser foot lifting transmission shaft (18) is sleeved with a presser foot lifting spring (16) for resetting.

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