Presser foot lifting and stitch length adjusting mechanism for a medium thickness sewing machine

Abstract

The utility model belongs to sewing machine technical field, concretely relates to a kind of lifting presser foot of medium-thick material sewing machine, stitch adjusting mechanism, including machine body, the lower part of machine body is provided with lower feed shaft, and one end of lower feed shaft is provided with feeding mechanism, and the other end of lower feed shaft is equipped with feed crank, and the upper part of machine body is provided with upper shaft, and one end of upper shaft is connected with main shaft motor for driving its rotation, and the outer periphery of upper shaft is equipped with feed eccentric wheel, and one end of feed eccentric wheel is formed with feed connecting rod, and the lower end of feed connecting rod is connected with feed crank, and the side surface of feed eccentric wheel is equipped with stitch adjusting wheel, the utility model is designed by the design of stepping motor one, so that when stepping motor one is rotated by driving shaft one and drives adjusting cam, it will be rotated by connecting rod one, connecting piece one, adjusting plate and stitch adjusting wheel, so that feed connecting rod moves up and down, to realize the adjustment of stitch, backstitch, and the adjustment operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a presser foot lifting and stitch length adjustment mechanism for a medium-thickness sewing machine. Background Technology

[0002] During the sewing process, sewing machines need to perform both forward and reverse stitches. Currently, reverse stitching on existing sewing machines is controlled manually. While this control method offers high controllability, it is inefficient and not conducive to high-efficiency sewing production. Some sewing machines use cylinders to perform reverse stitching, which improves efficiency; however, the movement of cylinders is too mechanized and not ideal for performing specialized reverse stitching operations.

[0003] As disclosed in CN206706349U, an automatic reverse-sewing sewing machine includes a sewing mechanism, an internal pressure mechanism, and a receiving mechanism. The sewing mechanism comprises a motor, a rotating shaft, a rotating wheel, a lifting rod, a needle holder, and a needle. The motor is connected to the rotating shaft, which passes through the center of the rotating wheel. The lifting rod has its two ends fixed to the circumference of the rotating wheel and the needle, respectively. The needle is inserted into the needle holder. The internal pressure mechanism includes an internal pressure handle, a bending connecting rod, an internal pressure foot bracket, and an internal pressure foot. The internal pressure foot is L-shaped, with one arm inserted into the internal pressure foot bracket. The bending connecting rod is W-shaped and has a support shaft in its middle. One support arm is fixed to the inner pressure handle, and the other support arm is fixed to the inner pressure foot; the receiving mechanism includes: a translation cylinder, a rotating plate, a translation handle, a linkage plate, a connecting frame, a translation rod, and a support base. The translation cylinder is connected to one end of the rotating plate, the translation handle is fixed to the linkage plate, the linkage plate has a downward pressing protrusion that abuts against the rotating plate, the upper end of the connecting frame has a rotating ring and a support rod, the rotating ring is penetrated by the rotating shaft, the rotating ring is located at the upper end of the support rod, the support rod is tangent to the rotating ring, the rotating plate is fixed to the rotating ring, and both ends of the translation rod have swing arms, the swing arms at both ends of the translation rod are respectively axially connected to the lower end of the support rod and the support base.

[0004] The existing technologies mentioned above still utilize cylinder drive, which can only achieve reverse stitching operation. The adjustment is relatively simple, and a separate cylinder is required to control the presser foot action, making the structure complex. Therefore, further improvements to the structure are needed. Utility Model Content

[0005] The purpose of this invention is to provide a presser foot lifting and stitch length adjustment mechanism for a medium-thickness sewing machine, which uses a stepper motor to drive the stitch length adjustment wheel, thus solving the problem of the existing single adjustment operation.

[0006] The purpose of this utility model is achieved as follows: A presser foot lifting and stitch length adjustment mechanism for a medium-thickness sewing machine includes a machine body. A lower feed shaft is located at the lower part of the machine body. A feeding mechanism is located at one end of the lower feed shaft, and a feeding crank is installed at the other end of the lower feed shaft. An upper shaft is located at the upper part of the machine body. One end of the upper shaft is connected to a main shaft motor for driving its rotation. A feeding eccentric wheel is installed on the outer circumference of the upper shaft. A feeding connecting rod is formed at one end of the feeding eccentric wheel. The lower end of the feeding connecting rod is connected to the feeding crank. A stitch length adjustment wheel is installed on the side of the feeding eccentric wheel, and an adjustment plate for driving its rotation is installed on the side of the stitch length adjustment wheel. A stepper motor is mounted on the side of the machine body. A drive shaft is mounted on the output end of the stepper motor. An adjusting cam and a presser foot crank are mounted on the outer periphery of the drive shaft. A connecting rod is formed on one end of the adjusting cam. A connector is connected to the other end of the connecting rod. The other end of the connector is connected to the adjusting plate to adjust the angle of the needle pitch adjusting wheel. A presser foot rotating seat is also fitted on the outer periphery of the drive shaft. A working part for the presser foot crank to push is provided on the side of the presser foot rotating seat. A pull rod assembly is connected to one end of the presser foot rotating seat. A presser foot plate is connected to the other end of the pull rod assembly. A presser foot mechanism is connected to the other end of the presser foot plate.

[0007] Preferably, the side of the stitch pitch adjusting wheel is formed with a groove, the adjusting plate is disposed in the groove, the adjusting plate is fixedly connected to the stitch pitch adjusting wheel, and a sleeve portion for mounting on the outer periphery of the upper shaft is formed in the adjusting plate.

[0008] Preferably, a linkage plate is installed on the side of the adjustment plate, and an adjustment part for pushing the adjustment plate is formed on the upper side of the linkage plate. A manual adjustment handle is installed on the linkage plate.

[0009] Preferably, a stepper motor 2 is installed at the lower part of the machine body, a drive shaft 2 is installed at the output end of the stepper motor 2, a gear 1 is installed on the outer periphery of the drive shaft 2, the gear 1 meshes with the gear 2, a wire-cutting shaft is provided inside the gear 2, the two ends of the wire-cutting shaft are respectively rotatably connected to the machine body, a wire-cutting crank is installed on the outer periphery of the upper end of the wire-cutting shaft, the wire-cutting crank is connected to a wire-cutting linkage mechanism, and the other end of the wire-cutting linkage mechanism is connected to a wire-cutting assembly.

[0010] Preferably, a bearing is provided between the second drive shaft and the machine body, and retaining rings are provided on both sides of the first gear and the first bearing.

[0011] Preferably, the tie rod assembly includes a screw and ball joint connectors mounted at both ends thereon.

[0012] Preferably, a bearing 2 is provided in the middle of the needle pitch adjusting wheel.

[0013] Preferably, a limit ring is installed on the other side of the needle pitch adjusting wheel.

[0014] The outstanding and beneficial technical effects of this utility model compared to the prior art are: 1. This utility model, through the design of a stepper motor, enables the stepper motor to drive the adjusting cam to rotate via the drive shaft, which in turn drives the stitch length adjusting wheel to rotate via the connecting rod, the connecting piece, and the adjusting plate. This causes the feeding connecting rod to move up and down, thereby achieving the adjustment of stitch length and backstitch, making the adjustment operation convenient.

[0015] 2. This utility model has an adjusting cam and a presser foot lifting crank installed on the outer periphery of the drive shaft, which can control the presser foot lifting and the stitch pitch adjustment mechanism separately with one motor, achieving the effect of one-to-two control. Compared with the prior art, there is no need to set up two cylinders for control, the structure is simpler and the cost is reduced, and the control is convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal mechanism of this utility model.

[0018] Figure 3 Schematic diagram of the feeding adjustment mechanism Figure 1 .

[0019] Figure 4 Schematic diagram of the feeding adjustment mechanism Figure 2 .

[0020] Figure 5 Schematic diagram of the feeding adjustment mechanism Figure 3 .

[0021] Figure 6 This is a schematic diagram of the presser foot lifting mechanism.

[0022] Reference numerals: 1-Machine body; 2-Lower feed shaft; 3-Feeding mechanism; 4-Feeding crank; 5-Upper shaft; 6-Main shaft motor; 7-Feeding eccentric wheel; 8-Feeding connecting rod; 9-Pint pitch adjusting wheel; 10-Adjusting plate; 11-Stepper motor one; 12-Drive shaft one; 13-Adjusting cam; 14-Pressure foot lifting crank; 15-Connecting rod one; 16-Connecting part one; 17-Pressure foot lifting rotating seat; 18-Working part; 19-Tie rod assembly; 2 0-Pressure foot plate; 21-Manual adjustment handle; 22-Card slot; 23-Sleeve part; 24-Linkage plate; 25-Adjustment part; 26-Stepper motor II; 27-Drive shaft II; 28-Gear I; 29-Gear II; 30-Wire cutting shaft; 31-Wire cutting crank; 32-Wire cutting linkage mechanism; 33-Wire cutting assembly; 34-Bearing I; 35-Retaining ring; 36-Screw; 37-Ball head connector; 38-Bearing II; 39-Limiting ring. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-6 As shown, a presser foot lifting and stitch length adjustment mechanism for a medium-thickness sewing machine includes a machine body 1. A lower feed shaft 2 is located at the lower part of the machine body 1. A feeding mechanism 3 is located at one end of the lower feed shaft 2, and a feeding crank 4 is installed at the other end of the lower feed shaft 2. An upper shaft 5 is located at the upper part of the machine body 1. A main shaft motor 6 for driving the upper shaft 5 is connected to one end of the upper shaft 5. A feeding eccentric wheel 7 is installed on the outer periphery of the upper shaft 5. A feeding connecting rod 8 is formed at one end of the feeding eccentric wheel 7. The lower end of the feeding connecting rod 8 is connected to the feeding crank 4. A stitch length adjustment wheel 9 is installed on the side of the feeding eccentric wheel 7. An adjustment plate 10 for driving the stitch length adjustment wheel 9 is installed on the side of the stitch length adjustment wheel 9. A stepper motor 11 is installed on the side of the machine body 1. A drive shaft 12 is installed at the output end of a stepper motor 11. An adjusting cam 13 and a presser foot crank 14 are respectively installed on the outer periphery of the drive shaft 12. A connecting rod 15 is formed at one end of the adjusting cam 13. A connector 16 is connected to the other end of the connecting rod 15. The other end of the connector 16 is connected to the adjusting plate 10 to adjust the angle of the needle pitch adjusting wheel 9. A presser foot rotating seat 17 is also sleeved on the outer periphery of the drive shaft 12. A working part 18 for the presser foot crank 14 to push is provided on the side of the presser foot rotating seat 17. A pull rod assembly 19 is connected to one end of the presser foot rotating seat 17. A presser foot plate 20 is connected to the other end of the presser foot plate 20. A presser foot mechanism is connected to the other end of the presser foot plate 20.

[0025] This utility model, through the design of a stepper motor, enables the stepper motor to drive the adjusting cam 13 to rotate via the drive shaft 12. This, in turn, drives the stitch length adjusting wheel 9 to rotate via the connecting rod 15, the connecting piece 16, and the adjusting plate 10. This causes the feeding connecting rod 8 to move up and down, thereby achieving the adjustment of stitch length and backstitch. The adjustment operation is convenient.

[0026] This invention features an adjusting cam 13 and a presser foot lifting crank 14 mounted on the outer periphery of the drive shaft 12. A single motor can control both the presser foot lifting mechanism and the stitch pitch adjustment mechanism, achieving a dual-function design. Compared to existing technologies, this design eliminates the need for separate cylinders, resulting in a simpler structure, reduced costs, and easier control.

[0027] The side of the stitch pitch adjusting wheel 9 is formed with a groove 22, and the adjusting plate 10 is disposed in the groove 22. The adjusting plate 10 is fixedly connected to the stitch pitch adjusting wheel 9. The adjusting plate 10 is formed with a sleeve portion 23 for mounting on the outer periphery of the upper shaft 5. Therefore, when the drive shaft 12 drives the adjusting cam 13 to move, it will drive the adjusting plate 10 to rotate on the outer periphery of the upper shaft 5 through the connecting rod 15 and the connecting piece 16, and at the same time drive the stitch pitch adjusting wheel 9 to rotate through the groove 22.

[0028] A linkage plate 24 is installed on the side of the adjustment plate 10. An adjustment part 25 for pushing the adjustment plate 10 is formed on the upper side of the linkage plate 24. A manual adjustment handle 21 is installed on the linkage plate 24. In actual use, the adjustment plate 10 can also be rotated by manually operating the manual adjustment handle 21, thereby realizing manual adjustment of the back seam.

[0029] A stepper motor 26 is installed at the lower part of the body 1. A drive shaft 27 is installed at the output end of the stepper motor 26. A gear 28 is installed on the outer periphery of the drive shaft 27. The gear 28 meshes with a gear 29. A wire-cutting shaft 30 is installed inside the gear 29. The two ends of the wire-cutting shaft 30 are rotatably connected to the body 1. A wire-cutting crank 31 is installed on the outer periphery of the upper end of the wire-cutting shaft 30. The wire-cutting crank 31 is connected to a wire-cutting linkage mechanism 32. The other end of the wire-cutting linkage mechanism 32 is connected to a wire-cutting assembly 33. Through the design of the stepper motor 26, the reciprocating wire-cutting action of the wire-cutting assembly 33 can be controlled by the forward and reverse rotation of the motor, which is convenient to control and conducive to realizing automated control.

[0030] A bearing 34 is provided between the drive shaft 27 and the body 1 to keep it rotating stably. Retaining rings 35 are provided on both sides of the gear 28 and the bearing 34 to prevent dust from entering the bearing and gear and extend their service life.

[0031] The tie rod assembly 19 includes a screw 36 and ball joint connectors 37 mounted at both ends thereon.

[0032] The needle pitch adjusting wheel 9 is provided with a bearing 38 in the middle to keep it rotating stably.

[0033] A limit ring 39 is installed on the other side of the needle pitch adjusting wheel 9.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A presser foot lifting and stitch length adjustment mechanism for a medium-thickness sewing machine, characterized in that, The machine includes a body (1), a lower feeding shaft (2) is provided at the lower part of the body (1), a feeding mechanism (3) is provided at one end of the lower feeding shaft (2), a feeding crank (4) is installed at the other end of the lower feeding shaft (2), an upper shaft (5) is provided at the upper part of the body (1), a main shaft motor (6) for driving its rotation is connected at one end of the upper shaft (5), a feeding eccentric wheel (7) is installed on the outer periphery of the upper shaft (5), a feeding connecting rod (8) is formed at one end of the feeding eccentric wheel (7), the lower end of the feeding connecting rod (8) is connected to the feeding crank (4), a needle pitch adjustment wheel (9) is installed on the side of the feeding eccentric wheel (7), an adjustment plate (10) for driving its rotation is installed on the side of the needle pitch adjustment wheel (9), a stepper motor (11) is installed on the side of the body (1), and the stepper motor (11) outputs... A drive shaft (12) is installed at the end. An adjustment cam (13) and a presser foot crank (14) are respectively installed on the outer periphery of the drive shaft (12). A connecting rod (15) is formed at one end of the adjustment cam (13). A connector (16) is connected to the other end of the connecting rod (15). The other end of the connector (16) is connected to the adjustment plate (10) to adjust the angle of the stitch pitch adjustment wheel (9). A presser foot rotating seat (17) is also sleeved on the outer periphery of the drive shaft (12). A working part (18) for the presser foot crank (14) to be pushed is provided on the side of the presser foot rotating seat (17). A pull rod assembly (19) is connected to one end of the presser foot rotating seat (17). A presser foot plate (20) is connected to the other end of the pull rod assembly (19). A presser foot mechanism is connected to the other end of the presser foot plate (20).

2. The presser foot lifting and stitch length adjustment mechanism of the medium-thickness sewing machine according to claim 1, characterized in that: The side of the needle pitch adjusting wheel (9) is formed with a groove (22), and the adjusting plate (10) is provided in the groove (22). The adjusting plate (10) is fixedly connected to the needle pitch adjusting wheel (9), and a sleeve part (23) for mounting on the outer periphery of the upper shaft (5) is formed in the adjusting plate (10).

3. The presser foot lifting and stitch length adjustment mechanism of the medium-thickness sewing machine according to claim 2, characterized in that: A linkage plate (24) is installed on the side of the adjustment plate (10), and an adjustment part (25) for pushing the adjustment plate (10) is formed on the upper side of the linkage plate (24). A manual adjustment handle (21) is installed on the linkage plate (24).

4. The presser foot lifting and stitch length regulating mechanism of a middle thickness sewing machine according to claim 1, wherein: The lower part of the body (1) is equipped with a stepper motor (26), the output end of the stepper motor (26) is equipped with a drive shaft (27), the outer periphery of the drive shaft (27) is equipped with a gear (28), the gear (28) meshes with a gear (29), a wire-cutting shaft (30) is provided inside the gear (29), the two ends of the wire-cutting shaft (30) are rotatably connected to the body (1), the upper end of the wire-cutting shaft (30) is equipped with a wire-cutting crank (31), the wire-cutting crank (31) is connected to a wire-cutting linkage mechanism (32), and the other end of the wire-cutting linkage mechanism (32) is connected to a wire-cutting assembly (33).

5. The presser foot lifting and stitch length regulating mechanism of a middle thickness sewing machine according to claim 4, wherein: A bearing (34) is provided between the second drive shaft (27) and the body (1), and retaining rings (35) are provided on both sides of the first gear (28) and the first bearing (34).

6. The presser foot lifting and stitch length adjustment mechanism of the medium-thickness sewing machine according to claim 1, characterized in that: The tie rod assembly (19) includes a screw (36) and ball joint connectors (37) mounted at both ends thereon.

7. The presser foot lifting and stitch length regulating mechanism of a middle thickness sewing machine according to claim 1, wherein: The needle pitch adjusting wheel (9) is provided with a bearing 2 (38) in the middle.

8. The presser foot lifting and stitch length adjustment mechanism of the medium-thickness sewing machine according to claim 1, characterized in that: A limit ring (39) is installed on the other side of the needle pitch adjusting wheel (9).

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