Automatic thread cutting lockstitch sewing machine for leather clothing

Abstract

The utility model discloses an automatic thread cutting lockstitch sewing machine for leather clothing, and aims to solve the problem that once a fault occurs, an operator often difficultly directly touches and maintains a thread cutting device because the thread cutting device is usually mounted in the lockstitch sewing machine. According to the technical scheme, the automatic thread cutting lockstitch sewing machine is characterized by comprising a sewing table, a machine head is arranged on the sewing table, a presser foot mechanism is arranged on the machine head, a thread cutting mechanism is arranged on the presser foot mechanism, the thread cutting mechanism comprises a fixing frame and a thread cutting blade, and a linear driving device is arranged on the fixing frame; and a first connecting block is arranged at the output end of the linear driving device. According to the automatic thread cutting lockstitch sewing machine for the leather clothing, the thread cutting blade can accurately and rapidly rotate to a sewing material to cut off a sewing thread through ingenious cooperation of the linear driving device and the spiral through groove, the movable clamping block is easily driven by the driving part to be away from the fixed clamping block, and then the thread cutting blade can be rapidly taken down; the external wire cutting mechanism is compact in overall structure and convenient to disassemble, assemble and maintain.

Description

Technical Field

[0001] This utility model relates to the field of flat sewing machine technology, and more specifically, it relates to an automatic flat sewing machine for leather garments with slits. Background Technology

[0002] A flatbed sewing machine is a machine that uses a sewing thread to create a stitch on the fabric, allowing one or more layers of fabric to interweave or sew together. In leather garment making, flatbed sewing machines are used to sew multiple pieces of leather or leather with other materials together to form a complete garment. In this process, flatbed sewing machines not only ensure the stability of the leather garment's connection but also greatly improve production efficiency.

[0003] In the design of traditional flatbed sewing machines, while pursuing efficient sewing, attention was also paid to the tedious and time-consuming process of manually cutting the thread. In order to reduce the burden on operators, most modern flatbed sewing machines have integrated a thread cutting device under the table to quickly cut the sewing thread after sewing is completed.

[0004] As the usage time increases, the blades of the thread cutting device often fail to mesh properly due to wear or misalignment, resulting in poor thread cutting effect or complete inability to cut the sewing thread. In order to ensure the continuity of production and product quality, the thread cutting device needs to be repaired or replaced. However, since the thread cutting device is usually installed inside the flat sewing machine and has a relatively complex structure, once a malfunction occurs, it is often difficult for operators to directly access and repair it, which increases the difficulty and time cost of maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an automatic thread-cutting and flat-sewing machine for leather garments. Through the ingenious combination of a linear drive device and a spiral through-groove, the thread-cutting blade is driven to descend and rotate simultaneously, enabling the thread-cutting blade to accurately and quickly rotate to the seam and cut the thread. The drive unit can easily move the moving clamp away from the fixed clamp, allowing the thread-cutting blade to be quickly removed. The external thread-cutting mechanism has a compact overall structure and is easy to disassemble and maintain.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an automatic leather garment cutting and flat sewing machine, including a sewing table, a sewing head on the sewing table, a presser foot mechanism on the sewing head, a thread cutting mechanism on the presser foot mechanism, the thread cutting mechanism including a fixed frame and a thread cutting blade, a linear drive device on the fixed frame, a first connecting block on the output end of the linear drive device, a second connecting block rotatably connected to the first connecting block, a drive rod fixedly connected to the bottom of the second connecting block, a connecting assembly between the lower end of the drive rod and the thread cutting blade, the connecting assembly including a fixed clamping block and a movable clamping block for assembling the thread cutting blade, a drive part for driving the movable clamping block closer to or away from the fixed clamping block, a fixed sleeve on the fixed frame sleeved on the outside of the drive rod, a sliding column on the outer wall of the drive rod, and a through groove on the fixed sleeve for the sliding column to slide, the through groove extending spirally in the axial direction of the fixed sleeve.

[0007] The present invention is further configured such that: the linear drive device includes a lead screw vertically mounted on a fixed frame, both ends of the lead screw being rotatably engaged with the fixed frame, a motor for driving the lead screw to rotate is mounted on the fixed frame, a movable block is threaded onto the lead screw, the movable block has a Z-shaped structure, and the end of the movable block away from the lead screw is fixedly connected to a first connecting block.

[0008] The present invention is further configured such that: a roller is rotatably sleeved on the sliding column, and the roller is in contact with the inner wall of the through groove.

[0009] The present invention is further configured such that: the driving part includes a mounting seat disposed on a driving rod, a first wedge block is slidably connected to the mounting seat, a threaded rod is rotatably connected to one side of the first wedge block, the threaded rod passes through the mounting seat and is threadedly engaged with it, a second wedge block is slidably connected to the mounting seat and wedges into the first wedge block, and an elastic element is fixedly abutting between the second wedge block and the mounting seat, the second wedge block is fixedly connected to a movable clamping block, and a fixed clamping block is disposed on the side opposite to the movable clamping block and fixedly connected to the mounting seat.

[0010] The present invention is further configured such that: both the first wedge and the second wedge are provided with sliders on the side near the mounting base, the sliders are in the shape of an "I", and the mounting base is provided with a groove for the sliders to slide.

[0011] The present invention is further configured such that rubber pads are provided on the opposite sides of the moving clamp and the fixed clamp.

[0012] In summary, this utility model has the following beneficial effects:

[0013] Through the ingenious combination of linear drive device and spiral through groove, the cutting blade is driven to descend and rotate at the same time, so that the cutting blade can accurately and quickly rotate to the seam to cut the thread. The drive unit can easily move the moving clamp away from the fixed clamp, so the cutting blade can be quickly removed. The external cutting mechanism has a compact overall structure and is easy to disassemble and maintain. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the flat sewing machine of this utility model;

[0015] Figure 2 This is a schematic diagram of the tangent mechanism of this utility model. Figure 1 ;

[0016] Figure 3 This is a schematic diagram of the tangent mechanism of this utility model. Figure 2 ;

[0017] Figure 4 This is a schematic diagram of the structure of the connecting component of this utility model. Figure 1 ;

[0018] Figure 5 This is a schematic diagram of the structure of the connecting component of this utility model. Figure 2 .

[0019] In the diagram: 1. Sewing table; 2. Sewing head; 3. Presser foot mechanism; 4. Thread cutting mechanism; 41. Fixing frame; 42. Thread cutting blade; 43. Linear drive device; 44. First connecting block; 45. Second connecting block; 46. Drive rod; 47. Connecting assembly; 471. Fixed clamping block; 472. Moving clamping block; 473. Drive unit; 48. Fixing sleeve; 461. Sliding column; 481. Through groove; 431. Lead screw; 432. Moving block; 4611. Roller; 4731. Mounting base; 4732. First wedge; 4733. Threaded rod; 4734. Second wedge; 4735. Elastic element; 4736. Slider; 474. Rubber pad. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "set up / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] Reference Figures 1-5 An automatic thread-cutting and flat-sewing machine for leather garments includes a sewing table 1, a sewing head 2 fixedly mounted on the sewing table 1, a presser foot mechanism 3 fixedly mounted on the sewing head 2, and a thread-cutting mechanism 4 fixedly mounted on the presser foot mechanism 3. The thread-cutting mechanism 4 includes a fixing frame 41 and a thread-cutting blade 42. A linear drive device 43 is fixedly mounted on the fixing frame 41. A first connecting block 44 is fixedly provided on the output end of the linear drive device 43. A second connecting block 45 is rotatably connected to the first connecting block 44. A drive rod 46 is fixedly connected to the bottom of the second connecting block 45. A connecting assembly 47 is provided between the lower end of 46 and the tangent blade 42. The connecting assembly 47 includes a fixed clamping block 471 and a movable clamping block 472 for assembling the tangent blade 42, and a driving part 473 for driving the movable clamping block 472 to move closer to or away from the fixed clamping block 471. A fixed sleeve 48 is fixedly provided on the fixed frame 41 and sleeved on the outside of the driving rod 46. A sliding column 461 is fixedly provided on the outer wall of the driving rod 46. A through groove 481 is provided on the fixed sleeve 48 for the sliding column 461 to slide. The through groove 481 extends spirally in the axial direction of the fixed sleeve 48.

[0025] Furthermore, the linear drive device 43 includes a lead screw 431 vertically mounted on a fixed frame 41. Both ends of the lead screw 431 are rotatably engaged with the fixed frame 41. A motor for driving the lead screw 431 to rotate is fixedly mounted on the fixed frame 41. A moving block 432 is threaded onto the lead screw 431. The moving block 432 has a Z-shaped structure, and the end of the moving block 432 away from the lead screw 431 is fixedly connected to the first connecting block 44.

[0026] When the motor starts, it drives the lead screw 431 to rotate, causing the moving block 432 to move up and down along the lead screw 431 under the action of the thread. The transmission efficiency is high, and it can accurately control the up and down movement of the cutting blade 42, ensuring the accuracy and stability of the cutting action. The Z-shaped moving block 432 drives the first connecting block 44 to move synchronously, which can make the structure more compact.

[0027] Furthermore, a roller 4611 is rotatably sleeved on the sliding column 461. The roller 4611 fits against the inner wall of the through groove 481. The roller 4611 rolls in the through groove 481, which effectively reduces the frictional resistance between the sliding column 461 and the inner wall of the through groove 481, reduces wear, and improves service life.

[0028] Furthermore, the drive unit 473 includes a mounting base 4731 fixedly mounted on the drive rod 46. A first wedge block 4732 is slidably connected to the mounting base 4731. A threaded rod 4733 is rotatably connected to one side of the first wedge block 4732. The threaded rod 4733 passes through the mounting base 4731 and is threadedly engaged with it. A second wedge block 4734 is slidably connected to the mounting base 4731 and wedges into the first wedge block 4732. An elastic element 4735, specifically a spring, is fixedly abutted between the second wedge block 4734 and the mounting base 4731. The second wedge block 4734 is fixedly connected to the movable clamping block 472. A fixed clamping block 471 is disposed on the opposite side of the movable clamping block 472 and is fixedly connected to the mounting base 4731.

[0029] When the threaded rod 4733 is rotated, the first wedge 4732 slides horizontally on the mounting base 4731 and pushes the second wedge 4734 downward through the wedging action, thereby causing the moving clamp 472 to descend and approach the fixed clamp 471, clamping the tangent blade 42 between the fixed clamp 471 and the moving clamp 472. At the same time, the elastic element 4735 is compressed in this process. When the threaded rod 4733 is rotated in the opposite direction, the first wedge 4732 slides in the opposite direction along the mounting base 4731 and no longer pushes the second wedge 4734. Under the action of the spring, the second wedge 4734 slides upward along the mounting base 4731, thereby causing the moving clamp 472 to move away from the fixed clamp 471. The tangent blade 42 can be removed after the limit is released. The clamping and loosening between the moving clamp 472 and the fixed clamp 471 is achieved by using the wedging transmission and thread adjustment method, which is simple, flexible and reliable in operation.

[0030] Furthermore, a slider 4736 is fixedly provided on the side of the first wedge 4732 and the second wedge 4734 near the mounting base 4731. The slider 4736 is in the shape of an "I". The mounting base 4731 is provided with a groove for the slider 4736 to slide, which ensures the stable sliding of the first wedge 4732 and the second wedge 4734 on the mounting base 4731 and improves the stability and accuracy of the transmission.

[0031] Furthermore, rubber pads 474 are glued to the opposite sides of the movable clamping block 472 and the fixed clamping block 471. The design of the rubber pads 474 can increase the clamping force between the movable clamping block 472 and the fixed clamping block 471.

[0032] Working principle: The flatbed sewing machine in this embodiment is basically the same as the conventional flatbed sewing machine. The sewing table 1, the machine head 2 and the presser foot mechanism 3 can all adopt the existing technology structure. The difference is that the flatbed sewing machine sets the thread cutting mechanism 4 on the outside. When the flatbed sewing machine is sewing normally, the thread cutting blade 42 is located behind the presser foot mechanism 3, which avoids interfering with the normal sewing process. When the sewing operation is completed and the thread needs to be cut, the linear drive device 43 drives the first connecting block 44 to descend vertically, which in turn drives the connected second connecting block 45, drive rod 46, connecting assembly 47 and thread cutter 42 to descend as a whole. As the sliding column 461 on the drive rod 46 moves down, it is guided by the spiral groove 481 on the fixed sleeve 48, causing the sliding column 461 to reverse and drive the drive rod 46 to deflect within the fixed sleeve 48. This causes the second connecting block 45 connected at the upper end to deflect relative to the first connecting block 44 and the thread cutter 42 connected at the lower end to rotate, ultimately rotating the thread cutter 42 to the fabric to cut the thread. When the thread cutter 42 needs maintenance, the drive unit 473 drives the moving clamp 472 away from the fixed clamp 471, allowing the thread cutter 42 to be quickly removed. The external thread cutting mechanism 4 has a compact overall structure and is easy to disassemble and maintain.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An automatic flat sewing machine for leather garments, comprising a sewing table (1), wherein a sewing head (2) is provided on the sewing table (1), and a presser foot mechanism (3) is provided on the sewing head (2), characterized in that: The presser foot mechanism (3) is provided with a tangent mechanism (4), which includes a fixing frame (41) and a tangent blade (42). A linear drive device (43) is provided on the fixing frame (41), and a first connecting block (44) is provided on the output end of the linear drive device (43). A second connecting block (45) is rotatably connected to the first connecting block (44), and a drive rod (46) is fixedly connected to the bottom of the second connecting block (45). A connecting assembly (47) is provided between the lower end of the drive rod (46) and the tangent blade (42). The connecting assembly (47) includes a fixed clamping block (471) and a movable clamping block (472) for assembling the tangent blade (42), and a driving part (473) for driving the movable clamping block (472) closer to or away from the fixed clamping block (471). The fixed frame (41) is provided with a fixed sleeve (48) sleeved on the outside of the driving rod (46). The outer wall of the driving rod (46) is provided with a sliding column (461). The fixed sleeve (48) is provided with a through groove (481) for sliding the sliding column (461). The through groove (481) extends spirally in the axial direction of the fixed sleeve (48).

2. The automatic thread-cutting and flat-sewing machine for leather garments according to claim 1, characterized in that: The linear drive device (43) includes a lead screw (431) vertically mounted on a fixed frame (41). Both ends of the lead screw (431) are rotatably engaged with the fixed frame (41). A motor for driving the lead screw (431) to rotate is mounted on the fixed frame (41). A moving block (432) is threaded onto the lead screw (431). The moving block (432) has a Z-shaped structure, and the end of the moving block (432) away from the lead screw (431) is fixedly connected to a first connecting block (44).

3. The automatic thread-cutting and flat-sewing machine for leather garments according to claim 1, characterized in that: A roller (4611) is rotatably sleeved on the sliding column (461), and the roller (4611) is in contact with the inner wall of the through groove (481).

4. The automatic thread-cutting and flat-sewing machine for leather garments according to claim 1, characterized in that: The drive unit (473) includes a mounting base (4731) disposed on the drive rod (46). A first wedge (4732) is slidably connected to the mounting base (4731). A threaded rod (4733) is rotatably connected to one side of the first wedge (4732). The threaded rod (4733) passes through the mounting base (4731) and is threadedly engaged with it. A second wedge (4734) is slidably connected to the mounting base (4731) and wedges into the first wedge (4732). An elastic element (4735) is fixedly abutted between the second wedge (4734) and the mounting base (4731). The second wedge (4734) is fixedly connected to the movable clamping block (472). The fixed clamping block (471) is disposed on the side opposite to the movable clamping block (472) and is fixedly connected to the mounting base (4731).

5. The automatic thread-cutting and flat-sewing machine for leather garments according to claim 4, characterized in that: Both the first wedge (4732) and the second wedge (4734) are provided with sliders (4736) on the side near the mounting base (4731). The sliders (4736) are in the shape of an "I". The mounting base (4731) is provided with a groove for the sliders (4736) to slide.

6. The automatic thread-cutting and flat-sewing machine for leather garments according to claim 1, characterized in that: Rubber pads (474) are provided on the opposite sides of the moving clamp (472) and the fixed clamp (471).

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