Interacting amount adjusting mechanism of presser foot of lockstitch sewing machine and lockstitch sewing machine

Abstract

The utility model relates to the technical field of lockstitch sewing machine, especially for a lockstitch sewing machine's presser foot interactive quantity adjusting mechanism and lockstitch sewing machine, including manual adjusting lever, connecting rod and the presser foot a of connecting rod lower end fixed connection, the lower end of manual adjusting lever is connected with the presser foot b, be connected with the crank mechanism on the connecting rod, the crank mechanism includes upper end crank mechanism and side crank mechanism, and the upper end crank mechanism is butt joined with the step motor, drive the upper end crank mechanism and the height adjustment of connecting rod in vertical direction under the drive of step motor, the utility model drives the crank mechanism linkage adjustment presser foot height through step motor, has realized the accurate electric control adjustment of presser foot interactive quantity, effectively solved the problem that traditional manual regulation efficiency is low, electric scheme stability is insufficient, promoted the transmission stability and the regulation accuracy, and the accuracy of presser foot movement in vertical direction is ensured with the limiting structure.

Description

Technical Field

[0001] This utility model relates to the field of flat sewing machine technology, specifically to a presser foot interaction adjustment mechanism for a flat sewing machine and a flat sewing machine. Background Technology

[0002] Flatbed sewing machines are the most widely used basic equipment in the garment and home textile sewing industries. They are mainly used for straight or curved stitching of fabrics, forming lockstitch through the interlacing of needle and thread and shuttle thread, resulting in strong and neat stitches. Their core structure includes the sewing head, feeding mechanism, presser foot device, and transmission system. They are compatible with various fabrics such as cotton, linen, silk, and synthetic fibers, and are widely used in the mass production of shirts, trousers, curtains, and other products.

[0003] Traditional mechanical adjustment mechanisms require manual operation and cannot respond to changes in fabric thickness in real time during sewing. Furthermore, the presser foot height can only be fixed at the highest or lowest point, and cannot be stopped at any position. This results in poor pressure adaptability for fabrics of different thicknesses, which can easily cause wrinkles or poor feeding.

[0004] Therefore, a presser foot interaction adjustment mechanism for a flatbed sewing machine and a flatbed sewing machine are needed to improve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a presser foot interaction adjustment mechanism for a flat sewing machine and a flat sewing machine in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A presser foot adjustment mechanism for a flat sewing machine includes a manual adjustment rod, a connecting rod, and a presser foot a fixedly connected to the lower end of the connecting rod. The lower end of the manual adjustment rod is connected to a presser foot b. A crank mechanism is connected to the connecting rod. The crank mechanism includes an upper crank mechanism and a side crank mechanism. The upper crank mechanism is connected to a stepper motor. Driven by the stepper motor, the upper crank mechanism and the connecting rod are adjusted in the vertical direction.

[0007] As a preferred embodiment of this utility model, the upper crank mechanism includes a connecting ring a fixedly connected to the output end of the stepper motor. A convex shaft a is fixedly connected to the side of the connecting ring a. A connecting piece a is rotatably connected to the outer side of the convex shaft a. A transmission piece b is rotatably connected to one end of the connecting piece a. The transmission piece b is triangular in shape, and the lower end of the transmission piece b is rotatably connected to the upper end of the connecting rod.

[0008] As a preferred embodiment of this utility model, a limiting member is provided on one side of the lower end of the transmission member b, and a limiting groove is formed on the inner side of the limiting member. The protrusion on one side of the lower end of the transmission member b is inserted into the limiting groove.

[0009] As a preferred embodiment of this utility model, the side crank mechanism includes a connecting piece b that is rotatably connected to the upper convex shaft b of the connecting rod. One end of the connecting piece b is rotatably connected to a fixed shaft a, and a connecting piece is fixedly connected to the side of the fixed shaft a. The lower end of the connecting piece is rotatably connected to the fixed shaft b. The upper end of the connecting piece is connected to a connecting piece c by bolts, and a connecting rod is fixedly connected to the end of the connecting piece c. A limit rod is rotatably connected inside the connecting rod.

[0010] As a preferred embodiment of this utility model, the manual adjustment lever includes an adjustment lever, and the lower end of the adjustment lever is connected to a pressure foot b.

[0011] A flat sewing machine includes the presser foot interaction amount adjustment mechanism described above, and also includes a machine body. The presser foot interaction amount adjustment mechanism is disposed at the front end of the machine body, and a thread clamping mechanism is disposed on the side of the machine body.

[0012] As a preferred embodiment of this utility model, the wire clamping mechanism includes an electrically controlled wire clamp and a mechanical wire clamp, and the machine body is respectively provided with an installation end b and an installation end a for installing the mechanical wire clamp and the electrically controlled wire clamp.

[0013] As a preferred embodiment of this utility model, a sleeve is fitted on the outer side of the adjusting rod, a hook is fixedly connected to the side of the sleeve, and a spring is provided between the sleeve and the inner side of the machine body, with the spring fitted on the outer side of the adjusting rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses a stepper motor to drive a crank mechanism to adjust the height of the presser foot, achieving precise electronic control adjustment of the presser foot's interaction. This effectively solves the problems of low efficiency in traditional manual adjustment and insufficient stability in electric solutions, improving transmission stability and adjustment accuracy. Combined with a limit structure, it ensures the accuracy of the presser foot's vertical movement. This invention employs a dual configuration of electronic control and mechanical thread clamps to further optimize stitch quality and achieve better thread clamping function during sewing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pressure foot interaction adjustment mechanism in this utility model; Figure 2 This is a first-view perspective perspective view of the flat sewing machine of this utility model; Figure 3 This is a second-view perspective perspective view of the flat sewing machine of this utility model; Figure 4 This is a third-person perspective view of the flat sewing machine of this utility model; Figure 5 This is a fourth-view perspective view of the flat sewing machine of this utility model.

[0016] In the diagram: Stepper motor 1, Connecting ring a2, Cam shaft a3, Adjusting rod 4, Spring 5, Connector a6, Transmission component b7, Connecting rod 8, Limiting component 9, Cam shaft b10, Presser foot a11, Connector b12, Fixed shaft a13, Fixed shaft b14, Connecting piece 15, Connector c16, Presser foot b17, Machine body 18, Mounting end a19, Mounting end b20, Sleeve 21, Wire hook 22, Electrically controlled wire clamp 23, Mechanical wire clamp 24. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Please see Figure 1-5 This utility model provides a technical solution: For an example, please refer to... Figure 1A presser foot adjustment mechanism for a flat sewing machine includes a manual adjustment rod, a connecting rod 8, and a presser foot a11 fixedly connected to the lower end of the connecting rod 8. The lower end of the manual adjustment rod is connected to a presser foot b17. A crank mechanism is connected to the connecting rod 8. The crank mechanism includes an upper crank mechanism and a side crank mechanism. The upper crank mechanism is connected to a stepper motor 1. Driven by the stepper motor 1, the upper crank mechanism and the connecting rod 8 are adjusted in the vertical direction.

[0022] The upper crank mechanism includes a connecting ring a2 fixedly connected to the output end of the stepper motor 1. A convex shaft a3 is fixedly connected to the side of the connecting ring a2. A connecting piece a6 is rotatably connected to the outer side of the convex shaft a3. A transmission piece b7 is rotatably connected to one end of the connecting piece a6. The transmission piece b7 is triangular in shape. The lower end of the transmission piece b7 is rotatably connected to the upper end of the connecting rod 8. A limiting piece 9 is provided on one side of the lower end of the transmission piece b7. A limiting groove is opened on the inner side of the limiting piece 9. A protrusion on one side of the lower end of the transmission piece b7 is inserted into the limiting groove. The side crank mechanism includes a connector b12 that is rotatably connected to the upper convex shaft b10 of the connecting rod 8. One end of the connector b12 is rotatably connected to a fixed shaft a13, and a connecting piece 15 is fixedly connected to the side of the fixed shaft a13. The lower end of the connecting piece 15 is rotatably connected to the fixed shaft b14. The upper end of the connecting piece 15 is connected to a connector c16 by bolts, and the end of the connector c16 is fixedly connected to a connecting rod 8. A limit rod is rotatably connected inside the connecting rod 8. The manual adjustment rod includes an adjustment rod 4, and the lower end of the adjustment rod 4 is connected to a pressure foot b17.

[0023] Stepper motor 1 serves as the core power source, and its output end is directly connected to connecting ring a2, driving connecting ring a2 to rotate around the motor shaft. The convex shaft a3 on the side of connecting ring a2 rotates synchronously with it. The rotational motion is transmitted to transmission component b7 through the rotating connecting piece a6. Transmission component b7 has a triangular structure, and its lower end is rotatably connected to the upper end of connecting rod 8. Under the pushing and pulling action of connecting piece a6, transmission component b7 performs lever motion with the vertex of the triangle as the fulcrum, thereby driving connecting rod 8 to rise and fall in the vertical direction, realizing the height adjustment of presser foot a11. The protrusion on one side of the lower end of the transmission component b7 is embedded in the limiting groove of the limiting component 9 to limit the lateral displacement of the transmission component b7 and ensure that the connecting rod 8 moves only in the vertical direction. The side crank mechanism is connected to the connecting rod 8 through the convex shaft b10. The connecting component b12 rotates around the fixed shaft a13. At the same time, the connecting piece 15 is fixed to the machine body through the fixed shaft b14 to form a triangular stable structure, which counteracts the lateral force when the connecting rod 8 rises and falls, and improves the adjustment accuracy.

[0024] The manual adjustment lever directly controls the presser foot b17 via the adjustment lever 4. The thread hook 22 on the outside of the sleeve 21 is used to guide the sewing thread. The spring 5 is sleeved on the outside of the adjustment lever 4 to provide a return spring force, realizing dual-mode compatibility of manual fine adjustment and electric adjustment.

[0025] A type of flatbed sewing machine, please refer to Figure 2 , 3 4 and 5, including the aforementioned presser foot interaction adjustment mechanism, include a body 18. The presser foot interaction adjustment mechanism is located at the front end of the body 18. A wire clamping mechanism is provided on the side of the body 18. The wire clamping mechanism includes an electrically controlled wire clamp 23 and a mechanical wire clamp 24. The body 18 is provided with an installation end b20 and an installation end a19 for installing the mechanical wire clamp 24 and the electrically controlled wire clamp 23, respectively.

[0026] Please refer to Figure 5 A sleeve 21 is fitted on the outer side of the adjusting rod 4. A hook 22 is fixedly connected to the side of the sleeve 21. A spring 5 is provided between the sleeve 21 and the inner side of the machine body 18. The spring 5 is fitted on the outer side of the adjusting rod 4.

[0027] The mounting ends a19 and b20 of the machine body 18 are respectively equipped with an electronically controlled thread clamp 23 and a mechanical thread clamp 24. The dual thread clamping system automatically or manually adjusts the thread tension according to sewing needs, and works in conjunction with the presser foot height change to ensure uniform stitches.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A presser foot interaction adjustment mechanism for a flat sewing machine, comprising a manual adjustment rod, a connecting rod (8), and a presser foot a (11) fixedly connected to the lower end of the connecting rod (8), wherein a presser foot b (17) is connected to the lower end of the manual adjustment rod, characterized in that: A crank mechanism is connected to the connecting rod (8). The crank mechanism includes an upper crank mechanism and a side crank mechanism. The upper crank mechanism is connected to a stepper motor (1). Under the drive of the stepper motor (1), the upper crank mechanism and the connecting rod (8) are adjusted in the vertical direction.

2. The presser foot interaction adjustment mechanism of the flat sewing machine according to claim 1, characterized in that: The upper crank mechanism includes a connecting ring a (2) fixedly connected to the output end of the stepper motor (1). A convex shaft a (3) is fixedly connected to the side of the connecting ring a (2). A connecting piece a (6) is rotatably connected to the outer side of the convex shaft a (3). A transmission piece b (7) is rotatably connected to one end of the connecting piece a (6). The transmission piece b (7) is triangular in shape, and the lower end of the transmission piece b (7) is rotatably connected to the upper end of the connecting rod (8).

3. The presser foot interaction adjustment mechanism of the flat sewing machine according to claim 2, characterized in that: A limiting member (9) is provided on one side of the lower end of the transmission member b (7). A limiting groove is opened on the inner side of the limiting member (9). The protrusion on one side of the lower end of the transmission member b (7) is inserted into the limiting groove.

4. The presser foot interaction adjustment mechanism of the flat sewing machine according to claim 3, characterized in that: The side crank mechanism includes a connector b (12) that is rotatably connected to the upper convex shaft b (10) of the connecting rod (8). One end of the connector b (12) is rotatably connected to a fixed shaft a (13), and a connecting piece (15) is fixedly connected to the side of the fixed shaft a (13). The lower end of the connecting piece (15) is rotatably connected to the fixed shaft b (14). The upper end of the connecting piece (15) is connected to a connector c (16) by bolts, and the end of the connector c (16) is fixedly connected to a connecting rod (8). A limit rod is rotatably connected inside the connecting rod (8).

5. The presser foot interaction adjustment mechanism of the flat sewing machine according to claim 4, characterized in that: The manual adjustment lever includes an adjustment lever (4), and the lower end of the adjustment lever (4) is connected to a pressure foot b (17).

6. A flatbed sewing machine, comprising the presser foot interaction adjustment mechanism as described in any one of claims 1-5, characterized in that: Includes a body (18), the pressure foot interaction adjustment mechanism is located at the front end of the body (18), and a wire clamping mechanism is provided on the side of the body (18).

7. The flat sewing machine according to claim 6, characterized in that: The wire clamping mechanism includes an electrically controlled wire clamp (23) and a mechanical wire clamp (24). The body (18) is provided with an installation end b (20) and an installation end a (19) for installing the mechanical wire clamp (24) and the electrically controlled wire clamp (23), respectively.

8. The flat sewing machine according to claim 7, characterized in that: A sleeve (21) is fitted on the outside of the adjusting rod (4), and a hook (22) is fixedly connected to the side of the sleeve (21). A spring (5) is provided between the sleeve (21) and the inside of the body (18), and the spring (5) is fitted on the outside of the adjusting rod (4).

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