Rotary head die cutting machine flat cutter device

Abstract

The utility model discloses a kind of rotary head template machine flat cutter devices, to provide a kind of cutting knife mechanism, reliable, stable operation, the device includes cylinder, cutting knife assembly, connecting assembly, cutter shaft seat and cutter shaft sleeve, cutting knife assembly includes moving knife transmission rod, fixed knife, fixed seat, moving knife and spring piece, moving knife is fixed on moving knife transmission rod upper end, fixed seat is cooperated in moving knife transmission rod upper end near moving knife, spring piece and fixed knife are sequentially fixed on fixed seat, moving knife transmission rod lower end passes through cutter shaft sleeve inlayed in cutter shaft seat, and is connected with cylinder by connecting assembly, cylinder action, moving knife transmission rod and moving knife are driven by connecting assembly and go up and down, cooperate with fixed knife to realize shearing, the utility model is by optimizing the cooperation structure of moving knife and fixed knife, and set spring piece auxiliary pressing cloth, effectively improve the shearing effect and reliability, its connecting assembly structure is compact, transmission is stable, overall performance is superior.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, specifically to a flat knife device for a rotating head template machine. Background Technology

[0002] In the sewing processing industry, including clothing, bags, and leather goods, automated and intelligent sewing equipment has become key to improving production efficiency and product quality. Among them, template sewing machines have gained widespread application due to their precise pattern sewing capabilities and low operating threshold. However, traditional template sewing machines face the problem of thread cutting after completing a sewing process.

[0003] Existing automatic thread-cutting devices, such as certain rotating blade or hook-blade structures, while achieving automatic thread-cutting, are often quite complex in structure, with numerous transmission components and a large footprint. This is acceptable for ordinary flatbed sewing machines with fixed heads, but for modern high-speed, multi-angle rotating head template machines, the space around the rotary hook assembly is extremely limited and rotates with the head, making it difficult to arrange the large thread-cutting device. Uneven mass distribution can even affect the stability and dynamic performance of the head rotation.

[0004] Furthermore, another significant drawback of existing thread-cutting devices is their insufficient ability to handle thread ends. Many devices fail to effectively control the remaining thread ends after cutting the thread, especially the bobbin thread. This problem may not be noticeable when using conventional sewing threads such as cotton or polyester; however, when dealing with highly elastic threads, the thread contracts due to its elasticity upon cutting. Without a mechanism to hold it in place, the bobbin thread can easily retract below the needle plate. This directly leads to a series of malfunctions during the next sewing process, such as the bobbin thread failing to be hooked out, needle not starting, and skipped stitches, severely impacting production continuity and yield. While some designs attempt to incorporate a thread-clamping function, these are often structurally complex, have low reliability, or require an additional drive source, further increasing system cost and maintenance difficulty.

[0005] Therefore, there is an urgent need in this field for a flat-blade thread cutting device that is compact in structure, efficient in transmission, reliable in thread cutting, and can automatically clamp the bottom thread end after cutting, especially suitable for rotary head template machines and high elastic sewing threads. Utility Model Content

[0006] To address the technical deficiencies in the background art, this utility model proposes a flat blade device for a rotating head template machine, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A flat blade device for a rotating head template machine includes a cylinder, a cutting blade assembly, a connecting assembly, a blade shaft seat, and a blade shaft sleeve. The blade shaft sleeve is embedded inside the blade shaft seat. The cutting blade assembly includes a moving blade drive rod, a fixed blade, a fixed seat, a moving blade, and a spring plate. The moving blade is fixed to the upper end of the moving blade drive rod. The fixed seat is fitted to the upper end of the moving blade drive rod near the moving blade. The spring plate is fixed to the upper end of the fixed seat. The fixed blade is fixed to the upper end of the spring plate. The lower end of the moving blade drive rod passes through the blade shaft sleeve. The lower end of the moving blade drive rod is fixedly connected to the connecting assembly. The other end of the connecting assembly is fixedly connected to the cylinder.

[0007] As a further technical solution of this utility model, the connecting component includes a fisheye connector, a flat blade connecting rod, and a flat blade connecting rod connector. The fisheye connector is fixedly connected to the cylinder, and the other end of the fisheye connector is rotatably connected to the flat blade connecting rod. The other end of the flat blade connecting rod is rotatably connected to the flat blade connecting rod connector.

[0008] As a further technical solution of this utility model, the cylinder is arranged horizontally, and a mounting base is fixed on the side of the cylinder near the cutter assembly. The mounting base has a hollow structure, and the fisheye connector is located in the hollow part of the mounting base.

[0009] As a further technical solution of this utility model, the cutting head of the moving blade is formed with a wedge-shaped part, the thickness of the wedge-shaped part decreases as the distance from the fixed seat decreases, the upper end surface of the wedge-shaped part is an inclined surface, and the lower end surface of the wedge-shaped part is a horizontal surface.

[0010] As a further technical solution of this utility model, the fixed blade is bent upward in a Z-shaped structure, the fixed blade head is located above the wedge-shaped part, and the lower end face of the fixed blade head is lower than the highest point of the upper end face of the wedge-shaped part.

[0011] As a further technical solution of this utility model, the spring sheet is bent upward in a Z-shaped structure, the upper end face of the end of the spring sheet away from the fixed seat is higher than the lower end face of the wedge-shaped part, the end of the spring sheet away from the fixed seat is bent downward, and the end of the spring sheet away from the fixed seat is lower than the lower end face of the wedge-shaped part.

[0012] As a further technical solution of this utility model, an adapter plate is fixed at the lower end of the fixed base.

[0013] The beneficial effects of this utility model are as follows: It adopts a cylinder and connecting rod transmission structure, resulting in a small overall size that can be easily integrated into the rotary hook assembly of a rotary head template machine, optimizing the equipment's spatial layout and making it suitable for high-speed, multi-angle sewing operations; the flat-blade cutting assembly, through the precise cooperation of the moving and fixed blades, can quickly and cleanly cut various types of sewing threads, especially providing excellent cutting effects on elastic threads, and is highly versatile; during the thread cutting process, the spring plate cooperates with the wedge-shaped part of the moving blade to clamp the bottom thread end while cutting the thread, effectively preventing thread slippage or failure to stitch when starting the needle, thus improving sewing quality and efficiency; the device has a simple and reasonable structure, stable transmission, and key components are easy to disassemble and replace, reducing equipment maintenance costs and improving production continuity and economy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the present utility model; Figure 2 This is a front view of an embodiment of the present utility model; Figure 3 This is a top view of an embodiment of the present utility model; Wherein: 1-Cylinder; 2-Cutter assembly; 21-Moving cutter drive rod; 22-Fixed cutter; 23-Fixed seat; 24-Moving cutter; 25-Spring plate; 26-Wedge-shaped part; 3-Connecting assembly; 31-Fisheye connector; 32-Flat cutter connecting rod; 33-Flat cutter connecting rod connector; 4-Cutter shaft seat; 5-Cutter shaft bushing; 6-Mounting seat; 7-Adapter plate. Detailed Implementation

[0015] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0016] like Figure 1As shown, the core of this utility model lies in providing a compact, efficient, precise, and long-lasting rotary head template machine flat blade device, including a cylinder 1, a cutting blade assembly 2, a connecting assembly 3, a blade shaft seat 4, and a blade shaft sleeve 5. The blade shaft sleeve 5 is embedded inside the blade shaft seat 4 using an interference fit. The cutting blade assembly 2 integrates a moving blade drive rod 21, a fixed blade 22, a fixing seat 23, a moving blade 24, and a spring plate 25. The moving blade 24 is fixed to the top of the moving blade drive rod 21 with screws. On the moving blade drive rod 21, immediately below the moving blade 24, a fixing seat 23 is fixed. A spring plate 25 with elasticity is fixed to the upper end of the fixing seat 23 with fasteners. The fixed blade 22 is also fixedly mounted on the upper end of the spring plate 25. The lower end of the moving blade drive rod 21 passes through the fixing seat 23 and the blade shaft sleeve 5 in sequence, and is finally fixedly connected to the connecting assembly 3. The other end of the connecting component 3 is connected to the output end of the cylinder 1, thereby accurately transmitting the linear reciprocating motion of the cylinder 1 to the cutting component 2.

[0017] like Figure 1 As shown, the connecting assembly 3 comprises three parts: a fisheye connector 31, a flat blade connecting rod 32, and a flat blade connecting rod connector 33. One end of the fisheye connector 31 is fixedly connected to the output end of the cylinder 1 via a thread, and the other end is rotatably connected to the flat blade connecting rod 32 via a bearing. The other end of the flat blade connecting rod 32 is rotatably connected to the flat blade connecting rod connector 33 via a pin, and the flat blade connecting rod connector 33 is fixedly connected to the lower end of the moving blade transmission rod 21. This multi-joint structure connecting assembly 3 can convert the thrust and pull of the cylinder 1 into the reciprocating rotational motion of the moving blade transmission rod 21, significantly reducing wear and operating noise.

[0018] like Figures 1 to 3 As shown, a mounting base 6 is fixed on the side of cylinder 1 near the cutter assembly 2. This mounting base 6 is designed as a hollow frame structure, its internal space accommodating the fisheye connector 31 and part of the flat blade connecting rod 32, which not only increases structural rigidity but also serves as a dustproof feature. The mounting base 6, fixed to the side of cylinder 1 near the cutter assembly 2, securely fixes the cylinder to the template machine head component, improving the overall stability of the device.

[0019] like Figures 2 to 3 As shown, the blade head of the moving blade 24 is divided into a wedge-shaped portion 26. The thickness of the wedge-shaped portion 26 gradually increases along the direction close to the fixed base 23. The upper end face of the wedge-shaped portion 26 is inclined, while the lower end face remains horizontal. This asymmetrical wedge design, with an upward inclination and a downward flatness, allows the inclined surface of the moving blade 24 to easily engage with the fixed blade 22 to cut the sewing thread when rotating for cutting. The lower end face of the wedge-shaped portion 26, when engaging with the fixed blade 22 to complete the cutting, can engage with the spring plate 25 to clamp the thread end and prevent it from falling off.

[0020] like Figures 1 to 2 As shown, the fixed blade 22 is designed with a Z-shaped bending shape. Through bending, its blade tip is positioned directly above the blade tip of the moving blade 24. The lower end face of the fixed blade 22 is slightly lower in height than the highest point of the upper end face of the moving blade 24. This means that during cutting, the blade portion of the moving blade 24 rotates towards the fixed blade 22, forming a precise cutting angle with minimal overlap. This arrangement easily accomplishes the task of cutting sewing thread.

[0021] like Figure 2 As shown, the spring sheet 25 is bent into a Z-shaped structure. The end of the spring sheet 25 near the fixed base 23 is firmly pressed, while the end away from the fixed base 23 is a free end. Its upper plane is precisely slightly higher than the lower end face of the wedge-shaped portion 26, and the end of this free end is also bent downwards, making it lower than the lower end face of the wedge-shaped portion 26. This design allows the spring sheet 25 to not only serve a connecting function, but its Z-shaped structure itself is also a highly efficient elastic body. When the moving blade 24 completes its cutting and returns to its original position, the elasticity of the spring sheet 25 quickly recovers, cooperating with the lower end face of the moving blade 24 to clamp the bottom thread end, effectively preventing thread slippage or failure to sew when starting the needle. Especially with highly elastic sewing threads, this ensures stable threading on the next operation, improving sewing quality and efficiency. The downward bend at the end serves to limit movement and enhance elasticity.

[0022] like Figure 2 As shown, an adapter plate 7 is added to the lower end of the fixed blade 22 seat of the fixed blade 22. The adapter plate 7 allows for flexible adjustment of the installation position of the fixed blade 22 assembly, greatly enhancing the versatility and adaptability of the flat blade device. Simultaneously, the adapter plate 7 increases the connection rigidity and overall mass of the fixed blade 22 side, making the working process smoother and quieter.

[0023] The flat blade device is mounted on the template machine via the adapter plate 7 and the fixed base 23. During operation, the movement of the cylinder 1 drives the fisheye connector 31 to reciprocate horizontally. Since the fisheye connector 31 and the flat blade connecting rod 32, as well as the flat blade connecting rod 32 and the flat blade connecting rod connector 33, are rotatably connected, and with the fixation of the blade shaft seat 4 and the presence of the blade shaft sleeve 5, the moving blade transmission rod 21 can reciprocate with the movement of the cylinder 1, simultaneously driving the moving blade 24 to reciprocate horizontally, thereby cutting the thread. Simultaneously, due to the presence of the spring plate 25, after cutting, the moving blade 24 returns to the starting position, and the spring plate 25 quickly rises, engaging with the lower end face of the moving blade 24 to firmly clamp the thread end, ensuring stable thread loading during the next operation, thus improving sewing efficiency and quality.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A flat blade device for a rotating head template machine, characterized in that: The device includes a cylinder (1), a cutter assembly (2), a connecting assembly (3), a cutter shaft seat (4), and a cutter shaft sleeve (5). The cutter shaft sleeve (5) is embedded inside the cutter shaft seat (4). The cutter assembly (2) includes a moving cutter drive rod (21), a fixed cutter (22), a fixed seat (23), a moving cutter (24), and a spring plate (25). The moving cutter drive rod (21) has a fixed cutter (24) fixed at its upper end. The fixed seat (23) is fitted to the moving cutter drive rod (21) near the moving cutter (24). The fixed seat (25) is fixed at its upper end. The fixed cutter (22) is fixed at its upper end. The lower end of the moving cutter drive rod (21) passes through the cutter shaft sleeve (5). The lower end of the moving cutter drive rod (21) is fixedly connected to the connecting assembly (3). The other end of the connecting assembly (3) is fixedly connected to the cylinder (1).

2. The rotary head template machine flat knife device as described in claim 1, characterized in that: The connecting assembly (3) includes a fisheye connector (31), a flat blade connecting rod (32), and a flat blade connecting rod connector (33). The fisheye connector (31) is fixedly connected to the cylinder (1). The other end of the fisheye connector (31) is rotatably connected to the flat blade connecting rod (32), and the other end of the flat blade connecting rod (32) is rotatably connected to the flat blade connecting rod connector (33).

3. The rotary head template machine flat knife device as described in claim 2, characterized in that: The cylinder (1) is arranged horizontally, and a mounting base (6) is fixed on the side of the cylinder (1) near the cutter assembly (2). The mounting base (6) is a hollow structure, and the fisheye connector (31) is located in the hollow part of the mounting base (6).

4. The rotary head template machine flat knife device as described in claim 1, characterized in that: The cutting head of the moving blade (24) is formed with a wedge-shaped part (26). The thickness of the wedge-shaped part (26) decreases as the distance from the fixed seat (23) decreases. The upper end face of the wedge-shaped part (26) is an inclined surface, and the lower end face of the wedge-shaped part (26) is a horizontal surface.

5. The rotary head template machine flat knife device as described in claim 4, characterized in that: The fixed blade (22) bends upward in a Z-shaped structure. The blade head of the fixed blade (22) is located above the wedge-shaped part (26), and the lower end face of the blade head of the fixed blade (22) is lower than the highest point of the upper end face of the wedge-shaped part (26).

6. The rotary head template machine flat blade device as described in claim 4, characterized in that: The spring sheet (25) is bent upward in a Z-shaped structure. The upper end face of the end of the spring sheet (25) away from the fixed seat (23) is higher than the lower end face of the wedge-shaped part (26). The end of the spring sheet (25) away from the fixed seat (23) is bent downward. The end of the spring sheet (25) away from the fixed seat (23) is lower than the lower end face of the wedge-shaped part (26).

7. The rotary head template machine flat knife device as described in claim 1, characterized in that: The lower end of the fixed base (23) is fixed with an adapter plate (7).

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