Machine base transmission mechanism and sewing machine

Abstract

According to the technical scheme, the engine base transmission mechanism and the sewing machine are provided, the engine base transmission mechanism comprises a thread trimming mechanism and a rotating shuttle mechanism, the thread trimming mechanism comprises a movable cutter driven by a driving shaft to rotate, and the rotating shuttle mechanism comprises a rotating shuttle driven by a rotating shuttle shaft to rotate; the movable cutter is rotationally arranged on the peripheral side of the rotating shuttle, and the driving shaft and the rotating shuttle shaft are coaxially arranged. According to the machine base transmission mechanism, the thread trimming mechanism and the rotating shuttle mechanism are coaxially arranged, the circumferential size of the machine base transmission mechanism can be effectively reduced, and therefore the installation space of the transmission mechanism is reduced. On the basis, the area, perpendicular to the cross section of the driving shaft, of the machine base can be effectively reduced, so that the machine base can be applied to closing-in sewing operation of small-opening sleeve-shaped products.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, specifically to a base transmission mechanism and a sewing machine. Background Technology

[0002] To improve production efficiency and automation, industrial sewing needs to consider various ancillary tasks in addition to the main sewing operations. These tasks, which were initially performed by operators, have now been integrated into industrial sewing equipment as the industry has evolved.

[0003] A patent application (CN115679562A) entitled "A Thread Trimming Mechanism for a Sewing Machine" discloses a thread trimming mechanism for a sewing machine. This mechanism is driven by a drive mechanism independently located beside the rotary hook. This structural design leads to a complex internal space layout for the machine base, making it difficult to coordinate the rational arrangement of internal components. Furthermore, it results in an increased volume of the machine base, hindering miniaturization. However, in some special applications, the volume of the machine base is limited. For example, when closing the sides of cylindrical products with limited circumferential dimensions, such as cup holders, the machine base needs to be inserted into the cylindrical product. In this case, the increased size of the machine base significantly limits the types of products it can be used with. Utility Model Content

[0004] Because existing thread-cutting mechanisms are bulky, have large base sizes, and are limited in application scenarios, this application provides a base transmission mechanism and sewing machine with optimized internal space layout and compact base size.

[0005] The present invention provides a base transmission mechanism, including a wire cutting mechanism and a rotary hook mechanism. The wire cutting mechanism includes a moving blade driven to rotate by a drive shaft, and the rotary hook mechanism includes a rotary hook driven to rotate by a rotary hook shaft.

[0006] The moving cutter is rotatably positioned on the periphery of the rotary hook, and the drive shaft is coaxially arranged with the rotary hook shaft.

[0007] Preferably, the drive shaft is coaxially sleeved with the rotary hook shaft.

[0008] Preferably, the rotary shuttle shaft passes through the hollow core of the drive shaft, and the rotary shuttle shaft is coaxially rotatable relative to the drive shaft.

[0009] Preferably, the wire cutting mechanism further includes a power device for driving the moving blade, the power device being disposed at the tail of the machine base and being connected to a drive shaft.

[0010] Preferably, the wire cutting mechanism further includes a fixed blade, and during the rotation of the moving blade, the surfaces of the moving blade and the fixed blade slide against each other; the cutting edge of the fixed blade of the wire cutting mechanism shears relative to the cutting edge of the moving blade.

[0011] Preferably, the fixed blade elastically presses against the surface of the moving blade.

[0012] A sewing machine comprising the base transmission mechanism described in any of the preceding claims.

[0013] The base transmission mechanism of this application effectively reduces the circumferential dimension of the base transmission mechanism by coaxially arranging the thread-cutting mechanism and the rotary hook mechanism, thereby reducing the installation space of the transmission mechanism. Furthermore, it effectively reduces the area of ​​the base perpendicular to the drive shaft cross-section, allowing the base to be used for the finishing sewing of small-opening, sleeve-shaped products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the installation of the base transmission mechanism of this application;

[0015] Figure 2 This is a partially exploded schematic diagram of the base transmission mechanism;

[0016] Figure 3 This is a schematic diagram of the base transmission mechanism;

[0017] Figure 4 This is a schematic diagram of the overall transmission mechanism of the machine base.

[0018] In the picture:

[0019] 1: Thread cutting mechanism; 11: Fixed blade; 111: Fixed blade edge; 12: Moving blade; 121: Moving blade edge; 13: Drive shaft; 14: Power unit; 2: Rotary shuttle mechanism; 21: Rotary shuttle; 23: Rotary shuttle shaft. Detailed Implementation

[0020] The present patent type will be described in detail below with reference to the accompanying drawings and specific embodiments. In this specification, the dimensions in the drawings do not represent actual size ratios. The drawings are only used to illustrate the relative positional and connection relationships between the components. Components with the same name or the same reference numerals represent similar or identical structures and are limited to illustrative purposes.

[0021] Figure 1 This is a schematic diagram of the installation of the base transmission mechanism of this application. Figure 2 This is a partially exploded schematic diagram of the base transmission mechanism. Figure 3This is a schematic diagram of the base transmission mechanism. It includes a wire cutting mechanism 1 and a rotary shuttle mechanism 2. The wire cutting mechanism 1 includes a fixed blade 11 fixed on the base and a movable blade 12. The movable blade 12 is fixedly connected to a drive shaft 13, which drives the movable blade 12 to rotate. During the rotation of the movable blade 12, the fixed blade edge 111 of the fixed blade 11 and the movable blade edge 121 of the movable blade 12 shear against each other to cut the bottom and top lines entering the movable blade edge 121 from the dividing port of the movable blade 12. The rotary shuttle mechanism 2 includes a rotary shuttle 21 fixed on a rotary shuttle shaft 23. To simplify the base design, the movable blade 12 is placed around the rotary shuttle 21 and rotates around it. The rotary shuttle shaft 23 is coaxial with the drive shaft 13. During the thread cutting process, the drive shaft 13 drives the moving blade 12 to rotate around the rotary shuttle 21. During the rotation, the moving blade edge 121 and the fixed blade edge 111 cut against each other. The fixed blade edge 111 adheres to the surface of the moving blade edge 121 under its own elasticity or the elasticity of an external elastic element. Under the rotation of the moving blade edge 121, the fixed blade edge 111 and the moving blade edge 121 cut off the bottom thread and the top thread during rotation.

[0022] In the technical solution of this application, the rotation drive mechanism of the moving blade edge 121 does not occupy extra space in the machine head because it is coaxially set with the rotary hook shaft 23. Similarly, the moving blade edge 121 is set on the outside of the rotary hook 21 and around the rotary hook 21, which also has a limited impact on the volume of the machine head. Therefore, compared with the prior art, the size of the machine head can be significantly reduced, making the machine head slender and miniaturized. Products with small circumferential size, such as cup sleeves, can be fitted onto the machine head for sewing, and thus can be used for the side ring sealing of products with small circumferential size, such as cup sleeves.

[0023] like Figure 2 Structural decomposition diagram and Figure 3 The structural diagram shows that the drive shaft 13 and the rotary hook shaft 23 are coaxially fitted together, with the rotary hook shaft 23 passing through the hollow core of the drive shaft 13. Therefore, only one set of drive shafts needs to be coaxially installed from the root of the machine base to the head of the machine base. Compared with setting separate drive mechanisms for the rotary hook mechanism 2 and drive mechanisms for the wire cutting mechanism 1, the cross-sectional dimension of the machine base perpendicular to the axial direction can be compressed, enabling the finishing operation of products with small circumferential dimensions.

[0024] like Figure 4 The schematic diagram shows the overall structure of the machine base, with the transmission mechanism housed within it. The power unit 14 of the thread-cutting mechanism 1 may not be located within the head space; it can be derived from the main power unit of the sewing machine via a camshaft or similar mechanism, or it can be installed independently. Figure 4The diagram illustrates a case where the power mechanism is independently configured. To accommodate the size of the compressor head, the power unit 14 is preferably located at the rear of the compressor base, connected to the drive shaft 13. Transmission between the two is achieved via a synchronous belt. The power unit 14 is commonly a servo motor, but other power units such as linear motors or electromagnets can also be used.

[0025] The above description is merely a preferred embodiment of this patent type and is not intended to limit the scope of this patent type. Without departing from the design spirit of this patent type, all modifications and improvements made by those skilled in the art to the technical solutions of this patent type should fall within the protection scope defined by the claims of this patent type.

Claims

1. A base transmission mechanism, comprising a wire-cutting mechanism (1) and a rotary hook mechanism (2), characterized in that, The wire cutting mechanism (1) includes a movable blade (12) driven to rotate by a drive shaft (13), and the rotary shuttle mechanism (2) includes a rotary shuttle (21) driven to rotate by a rotary shuttle shaft (23). The moving blade (12) is rotatably arranged around the circumference of the rotary hook (21), and the drive shaft (13) is coaxially arranged with the rotary hook shaft (23).

2. The base transmission mechanism as described in claim 1, characterized in that, The drive shaft (13) is coaxially sleeved with the shuttle shaft (23).

3. The base transmission mechanism as described in claim 2, characterized in that, The rotary shuttle shaft (23) passes through the hollow core of the drive shaft (13), and the rotary shuttle shaft (23) and the drive shaft (13) can rotate coaxially relative to each other.

4. The base transmission mechanism as described in any one of claims 1-3, characterized in that, The wire cutting mechanism (1) also includes a power device (14) for driving the moving blade (12). The power device (14) is located at the tail of the machine base and is connected to the drive shaft (13).

5. The base transmission mechanism as described in any one of claims 1-3, characterized in that, The thread cutting mechanism (1) also includes a fixed blade (11) that is fixedly arranged. During the rotation of the moving blade (12), the surfaces of the moving blade (12) and the fixed blade (11) slide against each other. The fixed blade edge (111) of the thread cutting mechanism (1) and the moving blade edge (121) of the moving blade (12) cut against each other to cut the sewing thread.

6. The base transmission mechanism as described in claim 5, characterized in that, The fixed blade (11) elastically presses against the surface of the moving blade (12).

7. A sewing machine, characterized in that, Includes the base drive mechanism as described in any one of claims 1-6.

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