Motor-driven upper differential mechanism of sewing machine

Abstract

The utility model discloses a motor-driven upper differential mechanism of a sewing machine, and particularly relates to the technical field of sewing machines, the motor-driven upper differential mechanism of the sewing machine comprises an upper shaft, a material pressing presser foot, a differential presser foot, a differential motor and a transmission assembly, the transmission assembly is used for driving a differential feeding shaft to rotate under the driving of the differential motor, and the differential feeding shaft is driven by the differential motor to rotate. The differential feeding shaft is fixedly connected with a feeding groove block, the feeding sliding block is connected into an open groove of the feeding groove block in a sliding mode, the feeding sliding block is rotationally connected to one end of the feeding swing arm, the feeding swing sleeve is fixedly connected to the front end of the feeding swing shaft, and the feeding swing rod is inserted into the feeding swing sleeve in a sliding mode and can move up and down relative to the feeding swing sleeve. The rear end of the differential presser foot handle is rotatably connected to the lower end of the feeding swing rod, and the differential presser foot is fixedly connected to the front end of the differential presser foot handle. The independent differential motor is adopted to drive the differential presser foot to feed the needle pitch, the complex mechanical transmission structure of pure mechanical differential and mechanical driving and non-adjustable differential needle pitch structure is simplified, and the fault risk is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a sewing machine, particularly a differential mechanism for the motor drive of a sewing machine. Background Technology

[0002] The working principle of existing sewing machines is that the needle bar drives the lead thread, which, under the drive of the drive device, passes through a curved needle with a wound thread at the bottom of the fabric, causing the lead thread and the wound thread to intertwine to achieve sewing. Existing sewing machines typically include a needle bar insertion and skipping stitch mechanism, a differential adjustment mechanism, and a fabric feeding mechanism. The differential adjustment mechanism adjusts the feeding speed and feed distance of the two feed teeth to overcome the deformation caused by slippage or shortening of the upper and lower layers of fabric, thereby completing the fabric feeding function and adjusting to various elastic fabrics.

[0003] Currently, the differential adjustment and main feed adjustment parts of sewing machines on the market are usually driven by a motor to rotate the main shaft, and then the main shaft is linked by a series of cranks and connecting rods. The differential adjustment and main feed adjustment parts are also linked together. Therefore, there are technical problems such as complex structure, large space occupation, large linkage load, high energy consumption of motor and other power control parts, and high overall manufacturing and use costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a differential mechanism for the motor drive of a sewing machine.

[0005] The objective of this utility model can be achieved through the following technical solution: A motor-driven differential mechanism for a sewing machine, comprising an upper shaft, a presser foot, a differential presser foot, and a differential presser foot lifting and lowering structure, characterized in that it further comprises a differential motor and a differential presser foot feeding structure. The differential presser foot feeding structure includes a differential presser foot handle, a feeding swing rod, a feeding swing sleeve, a feeding swing shaft, a feeding swing arm, a feeding slider, a feeding groove block, a differential feeding shaft, and a transmission assembly. The differential motor is fixedly connected to the machine housing, the differential feeding shaft is rotatably connected to the machine housing, and the transmission assembly is connected between the differential motor and the differential feeding shaft, and is used for driving the differential motor. The differential feeding shaft is rotated by the lower drive. The differential feeding shaft is fixedly connected to a feeding trough block. The feeding trough block has an open slot. The feeding slider is slidably connected in the open slot. The feeding slider is rotatably connected to one end of the feeding swing arm. The other end of the feeding swing arm is fixedly connected to the rear end of the feeding swing shaft. The feeding swing shaft is rotatably mounted on the machine housing. A feeding swing sleeve is fixedly mounted at the front end of the feeding swing shaft. The feeding swing rod is slidably inserted into the feeding swing sleeve and can move up and down relative to the feeding swing sleeve. The rear end of the differential pressure foot handle is rotatably connected to the lower end of the feeding swing rod. The differential pressure foot is fixedly connected to the front end of the differential pressure foot handle.

[0006] In the differential mechanism of the motor drive of the aforementioned sewing machine, the differential presser foot lifting and lowering structure includes a lifting eccentric wheel, a lifting connecting rod, a lifting crank, a lifting crank shaft, a lifting swing arm, a first lifting roller, a lifting swing arm, a presser rod guide, a lifting pin, a lifting rod, a second lifting roller, and a presser foot rod. The lifting eccentric wheel is fixedly connected to the upper shaft. One end of the lifting connecting rod is rotatably sleeved on the lifting eccentric wheel, and the other end is hinged to one end of the lifting crank. The other end of the lifting crank is fixedly connected to the lifting crank shaft. The lifting crankshaft is rotatably connected to the machine housing. One end of the lifting swing arm is fixedly connected to the lifting crankshaft, and the other end is connected to a lifting roller. The lifting roller abuts against one end of the lifting swing rod. The lifting swing rod is hinged to the pressure rod guide, and the other end of the lifting swing rod abuts against the lifting pin. The pressure foot rod is slidably connected in the machine housing. The lifting rod is slidably connected in the inner cavity of the pressure foot rod. The lifting pin is connected to the upper end of the lifting rod. The lower end of the lifting rod is connected to the differential pressure foot handle through a second lifting roller.

[0007] In the differential mechanism of the motor drive of the above-mentioned sewing machine, a spring is provided in the inner cavity of the presser foot bar to apply downward pressure to the lifting rod. When the lifting rod swings in the direction of moving downward relative to the lifting pin, the lifting rod is pushed downward by the pressure of the spring to move the differential presser foot down.

[0008] In the differential mechanism of the motor drive of the aforementioned sewing machine, the presser foot bar is slidably connected to the machine housing via a bushing. Adding a bushing at the mounting position increases the installation stability and smooth movement of the presser foot bar.

[0009] In the differential mechanism of the motor drive of the sewing machine described above, a presser foot mounting base is fixedly connected below the presser foot bar, the presser foot is fixedly connected to the presser foot mounting base, a slider is slidably connected to the feed swing arm, and the slider is slidably connected in the guide groove of the presser foot mounting base. When the feed swing arm swings, the slider slides in the guide groove of the presser foot mounting base.

[0010] In the differential mechanism of the motor drive of the above sewing machine, a spring is provided in the housing above the presser foot bar to apply downward pressure to the presser foot bar and to keep the presser foot pressed on the sewing material when it is not lifted.

[0011] In the differential mechanism of the motor drive of the aforementioned sewing machine, the pressure bar guide is fixedly connected to the presser foot bar. When it is necessary to lift the presser foot to prevent sewing, the presser foot lifting mechanism can achieve this by pushing the pressure bar guide upward.

[0012] In the differential mechanism of the motor drive of the above-mentioned sewing machine, the feeding swing shaft is rotatably connected to the machine housing through a bushing.

[0013] In the differential mechanism of the motor drive of the above-mentioned sewing machine, the differential feed shaft is rotatably connected to the machine housing through a bushing.

[0014] In the differential mechanism of the motor drive of the aforementioned sewing machine, the transmission assembly includes a feeding rocker arm, a differential feeding connecting rod, and a differential feeding crank. One end of the differential feeding crank is fixedly connected to the motor shaft of the differential motor, and the other end is hinged to one end of the differential feeding connecting rod. The other end of the differential feeding connecting rod is hinged to one end of the feeding rocker arm, and the other end of the feeding rocker arm is fixedly mounted on the differential feeding shaft. This embodiment uses a three-bar drive structure, but four-bar, five-bar, or other drive structures can also be used.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. An independent differential motor is used to drive the differential presser foot feeding needle pitch, realizing electronic and digital control. It also simplifies the complex mechanical transmission structure of pure mechanical differential and mechanical drive with no differential needle pitch adjustment, reducing the risk of failure.

[0017] 2. The differential motion mechanism and the differential motor are connected by a feeding shaft, which only transmits torque, reduces the extra load on the motor, and improves motion reliability;

[0018] 3. The differential motor should be installed away from the rear of the sewing machine head to allow space for the installation of additional devices such as electronic rear wheels. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of this utility model installed on the casing.

[0021] Figure 3 This is a schematic diagram of the structure of this utility model installed on the casing at another angle.

[0022] In the diagram, 1. Housing; 2. Upper shaft; 3. Lifting eccentric wheel; 4. Lifting connecting rod; 5. Lifting crank; 6. Opening slot; 7. Lifting swing arm; 8. Lifting roller one; 9. Lifting swing arm; 10. Pressure rod guide frame; 11. Lifting pin; 12. Lifting rod; 13. Lifting roller two; 14. Differential pressure foot handle; 15. Pressure foot rod; 16. Differential pressure foot; 17. Feeding swing arm; 18. Feeding swing sleeve; 19. Feeding swing shaft; 20. Feeding swing arm; 21. Feeding slider; 22. Feeding groove block; 23. Differential feeding shaft; 24. Feeding rocker arm; 25. Differential feeding connecting rod; 26. Differential feeding crank; 27. Differential motor; 28. Pressure foot mounting base; 29. ​​Pressure foot; 30. Slider. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] Reference Figures 1-3 This embodiment is a differential mechanism for the motor drive of a sewing machine, which further includes a differential presser foot lifting and lowering structure and a differential presser foot feeding structure.

[0025] Differential presser foot lifting and lowering structure: A rotating upper shaft 2 is installed on the housing 1. A lifting and lowering eccentric wheel 3, which is locked together with the upper shaft 2 and is optional, is installed on the upper shaft 2. A lifting and lowering connecting rod 4 is installed on the lifting and lowering eccentric wheel 3. The lifting and lowering eccentric wheel 3 rotates in the inner hole of one end of the lifting and lowering connecting rod 4, driving this end of the lifting and lowering connecting rod 4 to move around the center of the upper shaft 2. A rotary bearing can be optionally installed between the lifting and lowering eccentric wheel 3 and the lifting and lowering connecting rod 4 to improve smooth operation. The other end of the lifting linkage 4 is connected to one end of the lifting crank 5. The other end of the lifting crank 5 is fixedly installed on the lifting crank shaft. The lifting crank shaft is rotatably installed on the housing 1. The other end of the lifting crank 7 is fixedly installed on the lifting arm 7. The other end of the lifting arm 7 is installed on the lifting roller 8. When the differential presser foot 16 is lifted during sewing, the lifting roller 8 abuts against the lifting lever 9. The lifting lever 9 is rotatably installed on the presser rod guide frame 10. The other end of the lifting lever 9 abuts against the lifting pin 11, pushing the lifting pin 11 to move upward. The lifting pin 11 is installed on the upper end of the lifting rod 12. The lower end of the lifting rod 12 is connected to the differential presser foot handle 14 through the roller 13. The lifting rod 12 is installed inside the presser foot rod 15 and can move relative to it. The up and down movement of the lifting rod 12 drives the differential presser foot handle 14 and the differential presser foot 16 installed on the differential presser foot handle 14 to lift and lower.

[0026] Differential presser foot feeding structure: The rear end of the differential presser foot handle 14 is rotatably mounted on the lower end of the feeding swing arm 17. The feeding swing arm 17 is installed in the feeding swing sleeve 18 and can move up and down relative to it. The feeding swing sleeve is fixedly mounted on one end of the feeding swing shaft 19. The feeding swing shaft 19 is rotatably mounted on the machine housing 1, and the rear end of the feeding swing shaft 19 is fixedly mounted with the feeding swing arm 20. The other end of the feeding swing arm 20 is mounted with the feeding slider 21. The feeding slider 21 can rotate around its own center on the feeding swing arm 20. The feeding slider 21 is in the feeding groove 22. The feed chute 22 can slide relative to the feed chute 23 at one end. The other end of the feed chute 22 is fixedly installed at one end of the differential feed shaft 23. The differential feed shaft 23 is rotatably installed in the housing 1. The other end of the differential feed shaft 23 is fixedly installed with a feed rocker arm 24. The other end of the feed rocker arm 24 is rotatably connected to one end of the differential feed connecting rod 25. The other end of the differential feed connecting rod 25 is rotatably connected to one end of the differential feed crank 26. The other end of the differential feed crank 26 is fixedly installed on the differential motor 27. The differential motor 27 is fixedly installed on the housing 1.

[0027] Furthermore, the presser foot lever 15 is mounted vertically within the housing 1, and a bushing can be added at the mounting position to increase the installation stability and smooth movement of the presser foot lever 15.

[0028] Furthermore, a spring is provided inside the presser foot lever 15 to apply downward pressure to the lifting lever 12. When the lifting lever 9 swings in the direction of downward movement relative to the lifting pin 11, the lifting lever 12 is pushed downward by the spring to lower the differential presser foot 16.

[0029] Furthermore, a pressure rod guide 10 is fixedly installed on the pressure foot rod 15. When it is necessary to lift the pressure foot 29 to prevent sewing, the pressure foot lifting mechanism will lift the pressure rod guide 10 by pushing it upward.

[0030] Furthermore, a presser foot mounting base 28 is fixedly installed below the presser foot rod 15, and the pressing presser foot 29 is fixedly installed on the presser foot mounting base 28. A slider 30 is installed in the middle of the feeding swing rod 17. The slider 30 is in the guide groove of the presser foot mounting base 28. When the feeding swing rod 17 swings, the slider 30 slides back and forth in the guide groove of the presser foot mounting base 28.

[0031] Furthermore, a spring is installed inside the housing 1 above the presser foot 15 to apply downward pressure to the presser foot 15, so that the presser foot 29 can continue to press on the sewing material when it is not lifted.

[0032] Furthermore, the rotating structures of the feeding swing shaft 19 and the differential feeding shaft 23 located in the housing 1 can be respectively equipped with bushing two and bushing three to improve installation stability and rotation smoothness.

[0033] In this embodiment, the sewing machine spindle drives the differential presser foot's lifting and lowering motion, and an independent differential motor 27 drives the differential presser foot 16 to move horizontally. During sewing, the lifting and lowering amplitude of the differential presser foot 16 remains almost constant; therefore, the upper shaft 2 drives stable operation. Since the horizontal movement amplitude of the differential presser foot 16, i.e., the sewing stitch length, is frequently adjusted, the independent differential motor 27 allows for convenient electronic adjustment of the differential feed stitch length and enables synchronous adjustment with the electronic lower feed.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A motor-driven differential mechanism for a sewing machine, comprising an upper shaft (2), a presser foot (29), a differential presser foot (16), and a differential presser foot lifting and lowering structure, characterized in that, It also includes a differential motor (27) and a differential presser foot feeding structure. The differential presser foot feeding structure includes a differential presser foot handle (14), a feeding swing arm (17), a feeding swing sleeve (18), a feeding swing shaft (19), a feeding swing arm (20), a feeding slider (21), a feeding trough block (22), a differential feeding shaft (23), and a transmission assembly. The differential motor (27) is fixedly connected to the housing (1), and the differential feeding shaft (23) is rotatably connected to the housing (1). The transmission assembly is connected between the differential motor (27) and the differential feeding shaft (23) and is used to drive the differential feeding shaft (23) to rotate under the drive of the differential motor (27). The differential feeding shaft (23) is fixedly connected to the feeding trough block (22). Block (22) has an open slot (6), the feeding slider (21) is slidably connected in the slot (6), the feeding slider (21) is rotatably connected to one end of the feeding swing arm (20), the other end of the feeding swing arm (20) is fixedly connected to the rear end of the feeding swing shaft (19), the feeding swing shaft (19) is rotatably mounted on the housing (1), and the front end of the feeding swing shaft (19) is fixedly mounted with a feeding swing sleeve (18), the feeding swing rod (17) is slidably inserted into the feeding swing sleeve (18) and can move up and down relative to the feeding swing sleeve (18), the rear end of the differential pressure foot handle (14) is rotatably connected to the lower end of the feeding swing rod (17), and the differential pressure foot (16) is fixedly connected to the front end of the differential pressure foot handle (14).

2. The differential mechanism for the motor drive of the sewing machine according to claim 1, characterized in that, The differential presser foot lifting and lowering structure includes a lifting eccentric wheel (3), a lifting connecting rod (4), a lifting crank (5), a lifting crank shaft, a lifting swing arm (7), a first lifting roller (8), a lifting swing arm (9), a pressure rod guide (10), a lifting pin (11), a lifting rod (12), a second lifting roller (13), and a presser foot rod (15). The lifting eccentric wheel (3) is fixedly connected to the upper shaft (2). One end of the lifting connecting rod (4) is rotatably sleeved on the lifting eccentric wheel (3), and the other end is hinged to one end of the lifting crank (5). The other end of the lifting crank (5) is fixedly connected to the lifting crank shaft, and the lifting crank shaft is rotatably connected to the housing ( 1) One end of the lifting swing arm (7) is fixedly connected to the lifting crank shaft, and the other end is connected to the lifting roller (8). The lifting roller (8) abuts against one end of the lifting swing rod (9). The lifting swing rod (9) is hinged to the pressure rod guide (10), and the other end of the lifting swing rod (9) abuts against the lifting pin (11). The pressure foot rod (15) is slidably connected in the housing (1). The lifting rod (12) is slidably connected in the inner cavity of the pressure foot rod (15). The lifting pin (11) is connected to the upper end of the lifting rod (12). The lower end of the lifting rod (12) is connected to the differential pressure foot handle (14) through the lifting roller (2) (13).

3. The differential mechanism for the motor drive of the sewing machine according to claim 2, characterized in that, The inner cavity of the presser foot rod (15) is provided with a spring for applying downward pressure to the lifting rod (12). When the lifting rod (9) swings downward relative to the lifting pin (11), the lifting rod (12) is pushed downward by the pressure of the spring to lower the differential presser foot (16).

4. The differential mechanism for the motor drive of the sewing machine according to claim 2 or 3, characterized in that, The presser foot rod (15) is slidably connected to the housing (1) via a bushing.

5. The differential mechanism for the motor drive of the sewing machine according to claim 2, characterized in that, A presser foot mounting base (28) is fixedly connected below the presser foot rod (15). The pressing foot (29) is fixedly connected to the presser foot mounting base (28). A slider (30) is slidably connected to the feeding swing rod (17). The slider (30) is slidably connected in the guide groove of the presser foot mounting base (28). When the feeding swing rod (17) swings, the slider (30) slides in the guide groove of the presser foot mounting base (28).

6. The differential mechanism for the motor drive of the sewing machine according to claim 5, characterized in that, A spring is provided inside the housing (1) above the presser foot bar (15) to apply downward pressure to the presser foot bar (15) and to allow the presser foot (29) to continue pressing on the sewing material when it is not lifted.

7. The differential mechanism for the motor drive of the sewing machine according to claim 2, 5, or 6, characterized in that, The pressure rod guide (10) is fixedly connected to the pressure foot rod (15).

8. The differential mechanism for the motor drive of the sewing machine according to claim 1, 2, 3, 5, or 6, characterized in that, The feeding swing shaft (19) is rotatably connected to the housing (1) through the bushing.

9. The differential mechanism for the motor drive of a sewing machine according to claim 1, 2, 3, 5, or 6, characterized in that, The differential feeding shaft (23) is connected to the housing (1) by a bushing.

10. The differential mechanism for the motor drive of a sewing machine according to claim 1, 2, 3, 5, or 6, characterized in that, The transmission assembly includes a feeding rocker arm (24), a differential feeding connecting rod (25), and a differential feeding crank (26). One end of the differential feeding crank (26) is fixedly connected to the motor shaft of the differential motor (27), and the other end is hinged to one end of the differential feeding connecting rod (25). The other end of the differential feeding connecting rod (25) is hinged to one end of the feeding rocker arm (24), and the other end of the feeding rocker arm (24) is fixedly installed on the differential feeding shaft (23).

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