A sewing machine feeding structure

Abstract

This utility model provides a feeding structure for a sewing machine, belonging to the field of sewing machine technology. It solves the technical problem of the large overall structure of existing sewing machine feeding structures. This feeding structure includes a mounting base, a swing frame, a feeding motor, and a lifting and releasing mechanism. One end of the swing frame is rotatably connected to the feeding motor, and a drive wheel is fixed to the feeding motor. The other end of the swing frame is rotatably connected to a driven wheel. A feed belt connects the drive wheel and the driven wheel, with the feed end located at the driven wheel. A lifting and releasing rod assembly is provided between the lifting and releasing mechanism and the middle section of the swing frame. The lifting and releasing rod assembly includes an upper connector, a telescopic rod, and a spring. An eccentric wheel is fixed to the motor shaft of the lifting and releasing mechanism. The upper connector is connected to the eccentric wheel. The upper end of the telescopic rod passes through the upper connector, and the lower end of the telescopic rod is connected to the middle section of the swing frame. The upper end of the spring abuts against the connector, and the lower end of the spring abuts against the lower end of the telescopic rod. This utility model has the advantages of simple structure and continuous, smooth feeding.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a feeding structure for a sewing machine. Background Technology

[0002] The feeding structure is a mechanism on a sewing machine used to feed and move fabric during sewing. Currently, conventional feeding structures use a drag wheel for feeding, which is lifted when adjusting the fabric. For example, a sewing machine feeding device disclosed in Chinese patent literature [Application No. 202022245602.7] includes a motor bracket, a first motor mounted at the lower end of the bracket, a rotatable swing base connected to the first motor, a roller at the lower end of the swing base, and a transmission mechanism inside the swing base for connecting the first motor and the roller to drive the roller to rotate. The upper end of the motor bracket has a lifting component for connecting and controlling the swing of the swing base. In the above-mentioned prior art, a belt drive is used to rotate the roller to achieve feeding. The roller is located on one side of the belt drive mechanism, resulting in a large overall structure that occupies a significant amount of space during installation. Furthermore, the lack of a clamping structure during feeding leads to insufficient friction between the roller and the fabric, easily causing the roller to slip and resulting in discontinuous fabric feeding. Utility Model Content

[0003] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a feeding structure for a sewing machine. The technical problem solved by this utility model is to provide a compact feeding structure.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A sewing machine feeding structure includes a mounting base, a swing frame, a feeding motor, and a lifting and releasing mechanism. The feeding motor and the lifting and releasing mechanism are fixedly mounted on the mounting base. The swing frame is characterized in that one end is rotatably connected to the motor shaft of the feeding motor, a drive wheel is fixed to the motor shaft, and the other end of the swing frame is rotatably connected to a driven wheel. A feed belt is connected between the drive wheel and the driven wheel, with the feed end of the feed belt located at the driven wheel. A lifting and releasing rod assembly is provided between the lifting and releasing mechanism and the middle section of the swing frame. The lifting and releasing rod assembly includes an upper connector, a telescopic rod, and a spring. An eccentric wheel is fixed to the motor shaft of the lifting and releasing mechanism. The upper connector is connected to the eccentric wheel. The upper end of the telescopic rod passes through the upper connector and can move relative to the upper connector. The lower end of the telescopic rod is connected to the middle section of the swing frame. The upper end of the spring abuts against the connector, and the lower end of the spring abuts against the lower end of the telescopic rod.

[0006] During feeding, the electric motor lowers the swing frame, and under the action of the spring, the feeding end of the mop belt presses downward against the fabric. The feeding motor drives the mop belt to rotate, and the feeding end of the mop belt moves the fabric, thus feeding the fabric. When it is necessary to adjust or change the fabric, the electric motor raises the swing frame, and the feeding end of the mop belt is raised. The feeding end of the mop belt directly contacts the fabric, eliminating the need for rollers, making the structure simpler and more compact, requiring less installation space, and easier to adapt to different models. The spring provides clamping force during feeding, and the feeding end of the mop belt has sufficient friction with the fabric to avoid slippage and achieve continuous and smooth feeding.

[0007] In the above-mentioned sewing machine feeding structure, the swing frame includes a side plate and a swing rod. The swing rod is located outside the side plate and the front section of the swing rod extends forward. The front side of the side plate is provided with a reinforcing strip that extends forward and overlaps with the middle section of the swing rod.

[0008] In the above-described sewing machine feeding structure, a reinforcing baffle is provided on the upper side of the swing arm near the side plate, and the rear end of the reinforcing baffle coincides with the reinforcing strip. The reinforcing baffle not only improves the strength of the swing arm but also limits the movement of the feed belt.

[0009] In the above-described sewing machine feeding structure, a thickened portion is provided on the lower side of the swing arm near the side plate. The thickened portion increases the strength of the swing arm.

[0010] In the above-described sewing machine feeding structure, the thickness of the swing arm gradually decreases from the middle to the rear. The rear section of the swing arm overlaps with the side plate and the reinforcing strip, providing sufficient strength to reduce its thickness and thus lower the weight of the swing frame, thereby reducing the load on the feeding motor.

[0011] In the above-mentioned sewing machine feeding structure, the upper end of the telescopic rod is provided with a limiting flange, which can abut against the upper connector. When the feeding end of the feeder belt is pressed to feed the material, the limiting flange disengages from the upper connector.

[0012] In the above-described sewing machine feeding structure, the upper connector is provided with a threaded section, and an adjusting nut is screwed onto the threaded section. The upper end of the spring abuts against the adjusting nut. The adjusting nut can adjust the spring force to adapt the appropriate clamping force according to different fabric thicknesses and materials, ensuring that the feeding end of the feed belt has sufficient friction with the fabric, so as to achieve continuous and smooth feeding of different fabrics.

[0013] In the above-described sewing machine feeding structure, a tension bearing is rotatably connected to the swing frame and pressed against the feed belt pulley. The tension bearing keeps the feed belt taut, ensuring that the feed end of the feed belt can be fed at the set speed; using the bearing directly as the tension wheel simplifies the structure.

[0014] Compared with existing technologies, the feeding structure of this sewing machine has the advantages of simple structure and continuous and smooth feeding. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the feeding mechanism of this sewing machine.

[0016] Figure 2 This is a front view schematic diagram of the feeding structure of this sewing machine when the frame is in the feeding position.

[0017] Figure 3 This is a front view schematic diagram of the feeding structure of this sewing machine when the swing frame is raised.

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the display stand.

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of the display stand from another perspective.

[0020] Figure 6 This is a cross-sectional view of the lifting rod assembly.

[0021] In the diagram, 1. Mounting base; 2. Swing frame; 21. Side plate; 22. Reinforcing strip; 23. Swing rod; 24. Reinforcing flange; 25. Thickened part; 3. Feeding motor; 4. Lifting and discharging motor; 41. Eccentric wheel; 5. Upper connector; 51. Threaded section; 52. Telescopic rod; 53. Limiting flange; 54. Spring; 55. Adjusting nut; 6. Drive wheel; 61. Driven wheel; 62. Drag belt; 621. Feeding end; 63. Tensioning bearing. Detailed Implementation

[0022] 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.

[0023] like Figures 1 to 6 As shown, the sewing machine feeding structure includes a mounting base 1, a swing frame 2, a feeding motor 3, and a lifting and discharging motor 4. The feeding motor 3 and the lifting and discharging motor 4 are fixedly mounted on the mounting base 1. One end of the swing frame 2 is rotatably connected to the motor shaft of the feeding motor 3 via a bearing. A drive wheel 6 is fixed on the motor shaft of the feeding motor 3. The other end of the swing frame 2 is rotatably connected to a driven wheel 61. A feed belt 62 is connected between the drive wheel 6 and the driven wheel 61. The end of the feed belt 62 located at the driven wheel 61 is the feeding end 621. Annular baffles are provided on both sides of the driven wheel 61. The feed belt 62 is located between the two annular baffles. A tension bearing 63 is rotatably connected to the swing frame 2 and pressed against the feed belt 62 wheel. In this embodiment, the tension bearing 63 is pressed against the middle position of the upper side of the feed belt 62. The tension bearing 63 is a ball bearing, which is inexpensive and reliable.

[0024] A lifting rod assembly is provided between the middle section of the lifting generator 4 and the swing frame 2. The lifting rod assembly includes an upper connector 5, a telescopic rod 52, and a spring 54. An eccentric wheel 41 is fixed on the motor shaft of the lifting generator 4. The upper connector 5 is connected to the eccentric wheel 41. The eccentric wheel 41 drives the upper connector 5 to move up and down, thereby realizing the up and down movement of the lifting rod assembly. The upper end of the telescopic rod 52 passes through the upper connector 5 and can move relative to the upper connector 5. The upper end of the telescopic rod 52 is provided with a limiting flange 53, which can abut against the upper connector 5. The lower end of the telescopic rod 52... The upper connector 5 is connected to the middle section of the swing frame 2. A threaded section 51 is provided on the upper connector 5, and an adjusting nut 55 is screwed onto the threaded section 51. The upper end of the spring 54 abuts against the adjusting nut 55, and the lower end of the spring 54 abuts against the lower end of the telescopic rod 52. When the swing frame 2 is raised, the limiting protrusion 53 abuts against the upper connector 5 under the action of the spring 54. When the swing frame 2 is lowered, the telescopic rod 52 will move upward relative to the upper connector 5. At this time, under the action of the spring 54, the telescopic rod 52 will press down on the swing frame 2, thereby pressing the feeding end 621 of the mop belt 62 onto the fabric.

[0025] The swing frame 2 includes a side plate portion 21 and a swing rod portion 23. The swing rod portion 23 is located outside the side plate portion 21 and the front section of the swing rod portion 23 extends forward. The front side of the side plate portion 21 is provided with a reinforcing strip portion 22 that extends forward and overlaps with the middle section of the swing rod portion 23. The upper side of the swing rod portion 23 near the side plate portion 21 is provided with a reinforcing flange 24, and the rear end of the reinforcing flange 24 overlaps with the reinforcing strip portion 22. The lower side of the swing rod portion 23 near the side plate portion 21 is provided with a thickened portion 25. The thickness of the swing rod portion 23 gradually decreases from the middle to the rear end.

[0026] When feeding, the lifting motor 4 lowers the swing frame 2. Under the action of the spring 54, the feeding end 621 of the cloth belt 62 will press down on the fabric. The feeding motor 3 drives the cloth belt 62 to rotate, and the feeding end 621 of the cloth belt 62 will move the fabric to achieve the feeding of the fabric. When it is necessary to adjust or change the fabric, the lifting motor 4 raises the swing frame 2, and the feeding end 621 of the cloth belt 62 is raised upward.

[0027] 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 feeding structure for a sewing machine, comprising a mounting base (1), a swing frame (2), a feeding motor (3), and a lifting and discharging motor (4), wherein the feeding motor (3) and the lifting and discharging motor (4) are fixedly mounted on the mounting base (1), characterized in that, One end of the swing frame (2) is rotatably connected to the motor shaft of the feeding motor (3). A drive wheel (6) is fixed on the motor shaft of the feeding motor (3). The other end of the swing frame (2) is rotatably connected to a driven wheel (61). A mop belt (62) is connected between the drive wheel (6) and the driven wheel (61). The end of the mop belt (62) located at the driven wheel (61) is the feeding end (621). A lifting rod assembly is provided between the lifting and discharging machine (4) and the middle section of the swing frame (2). The components include an upper connector (5), a telescopic rod (52), and a spring (54). An eccentric wheel (41) is fixed on the motor shaft of the lifting discharge machine (4). The upper connector (5) is connected to the eccentric wheel (41). The upper end of the telescopic rod (52) passes through the upper connector (5) and can move relative to the upper connector (5). The lower end of the telescopic rod (52) is connected to the middle section of the swing frame (2). The upper end of the spring (54) abuts against the connector, and the lower end of the spring (54) abuts against the lower end of the telescopic rod (52).

2. The sewing machine feeding structure according to claim 1, characterized in that, The swing frame (2) includes a side plate (21) and a swing rod (23). The swing rod (23) is located outside the side plate (21) and the front section of the swing rod (23) extends forward. The front side of the side plate (21) is provided with a reinforcing strip (22) that extends forward and overlaps with the middle section of the swing rod (23).

3. The sewing machine feeding structure according to claim 2, characterized in that, The upper side of the swing arm (23) near the side plate (21) is provided with a reinforcing flange (24), and the rear end of the reinforcing flange (24) coincides with the reinforcing strip (22).

4. The sewing machine feeding structure according to claim 2, characterized in that, The lower side of the swing arm (23) near the side plate (21) is provided with a thickened part (25).

5. The sewing machine feeding structure according to claim 2, characterized in that, The thickness of the swing arm (23) gradually decreases from the middle to the rear end.

6. The sewing machine feeding structure according to any one of claims 1 to 5, characterized in that, The upper end of the telescopic rod (52) is provided with a limiting flange (53), which can abut against the upper connector (5). When the feeding end (621) of the mop belt (62) is pressed to feed the material, the limiting flange (53) disengages from the upper connector (5).

7. The sewing machine feeding structure according to any one of claims 1 to 5, characterized in that, The upper connector (5) is provided with a threaded section (51), and an adjusting nut (55) is screwed onto the threaded section (51). The upper end of the spring (54) abuts against the adjusting nut (55).

8. The sewing machine feeding structure according to any one of claims 1 to 5, characterized in that, The swing frame (2) is rotatably connected to a tension bearing (63) that is pressed against the pulley of the mop belt (62).

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