Presser foot lifting and thread trimming integrated transmission mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a sewing machine presser foot lifting and thread trimming integrated transmission mechanism which comprises a sewing machine body, a servo motor, a thread trimming mechanism, a presser foot lifting mechanism and a driving mechanism, the servo motor is fixed on one side of the sewing machine body, and the driving mechanism at the output end of the servo motor is provided with a first driving portion and a second driving portion. The servo motor drives the thread trimming mechanism and the presser foot lifting mechanism respectively, the thread trimming mechanism drives a cutter to trim threads through a swing rod, a connecting rod and other components, the presser foot lifting mechanism lifts a presser foot through a linkage piece, a linkage rod and the like, and the servo motor rotates forwards and backwards to drive the controller to control the two mechanisms to act. The sewing machine is simple in structure and stable in operation, noise interference is effectively reduced, a quiet and comfortable working environment is created for operators, sewing efficiency of workers is improved, meanwhile, a stable working state can still be kept under the condition of long-time high-frequency use, and the failure rate of equipment is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically a sewing machine presser foot lifting and thread cutting integrated transmission mechanism. Background Technology

[0002] As a key piece of equipment in industries such as garment manufacturing, sewing machines greatly improve sewing efficiency and quality. Their internal structure is precise and complex, and the presser foot lifting and thread cutting transmission mechanisms are indispensable and important parts. The presser foot lifting transmission mechanism realizes the raising and lowering of the presser foot, which facilitates the changing of fabric and adjustment of position. The thread cutting transmission mechanism drives the blade to cut the thread when sewing is completed, accurately controlling the thread cutting length and improving the level of automation and sewing quality.

[0003] The existing presser foot lifting and wire cutting transmission mechanism consists of electromagnet, armature, return spring, transmission link, presser foot, cutter and other parts. The working principle is as follows: when the electromagnet is energized, it attracts the armature. The armature is connected to the transmission link. The transmission link drives the presser foot or cutter to move, realizing the action of lifting the presser foot or cutting the wire.

[0004] The existing sewing machine presser foot lifting and thread trimming mechanisms have the following drawbacks: Using electromagnets to drive the presser foot and thread trimming generates significant noise due to the energized engagement mechanism. This noise can potentially damage the operator's hearing and, with prolonged exposure, easily leads to operator fatigue, affecting work performance and efficiency. Furthermore, the electromagnet drive has a certain delay, failing to respond quickly and accurately to operating commands, resulting in excessively long interruptions in the sewing process. This severely impacts worker efficiency, making it difficult to increase output per unit time. Moreover, electromagnets are prone to overheating under high-frequency use, leading to damage and a high equipment failure rate. Frequent failures not only increase maintenance costs but also delay production due to equipment downtime, causing economic losses for the company. Therefore, to address these issues, a sewing machine presser foot lifting and thread trimming integrated transmission mechanism is proposed. Utility Model Content

[0005] To overcome the shortcomings of existing sewing machine presser foot lifting and thread cutting mechanisms, a new integrated transmission mechanism for sewing machine presser foot lifting and thread cutting is proposed.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The sewing machine presser foot lifting and thread cutting integrated transmission mechanism of this utility model includes a sewing machine body and a servo motor. The servo motor is fixedly mounted on one side of the sewing machine body. The sewing machine body is equipped with a thread cutting mechanism for cutting the thread and a presser foot lifting mechanism for lifting the presser foot. The output end of the servo motor is equipped with a drive mechanism. The drive mechanism is equipped with a first drive part for driving the thread cutting mechanism to cut the thread and a second drive part for driving the presser foot lifting mechanism to lift the presser foot.

[0007] Preferably, the thread-cutting mechanism includes a swing arm rotatably mounted on one side of the sewing machine body via a first rotating rod. One end of the swing arm is a first abutting part that cooperates with a first driving part. The other end of the swing arm is rotatably mounted with a first connecting rod. The other end of the first connecting rod is rotatably mounted with a second connecting rod. A second rotating rod is rotatably mounted on the sewing machine body via a mounting block. One end of the second connecting rod is rotatably connected to the second rotating rod. A cutter is fixedly mounted on the second rotating rod.

[0008] Preferably, the presser foot lifting mechanism includes a linkage component rotatably mounted on the sewing machine body via a third rotating rod. The linkage component is provided with a second abutment portion that cooperates with the second drive unit. A linkage rod is fixedly mounted at the other end of the third rotating rod, and a long rod is fixedly mounted at the other end of the linkage rod. A presser foot for pressing the fabric is mounted at the other end of the long rod.

[0009] Preferably, the drive mechanism includes a transmission disk fixedly mounted on the output end of the servo motor, and both the first drive unit and the second drive unit are mounted on the transmission disk.

[0010] Preferably, the servo motor is equipped with a forward and reverse drive controller, and the forward and reverse rotation of the servo motor can drive the wire cutting mechanism and the pressure foot lifting mechanism to perform wire cutting or pressure foot lifting actions respectively.

[0011] Preferably, a first torsion spring for driving the swing arm to reset is fitted on the first rotating rod, and the two ends of the first torsion spring abut against the swing arm and one side of the sewing machine body, respectively. A second torsion spring for driving the linkage component to reset is fitted on the third rotating rod, and the two ends of the second torsion spring abut against the linkage component and one side of the sewing machine body, respectively.

[0012] The beneficial effects of this utility model are:

[0013] Through structural optimization, this invention achieves the lifting of the presser foot and the thread cutting action via mechanical transmission, resulting in smooth operation and effectively reducing noise interference. This creates a quieter and more comfortable working environment for operators. Furthermore, by utilizing a servo motor paired with a forward and reverse drive controller, this invention can quickly and accurately respond to operating commands, driving the thread cutting mechanism and presser foot lifting mechanism to act promptly, greatly improving the sewing efficiency of workers. At the same time, it can maintain a stable working state even under long-term, high-frequency use, reducing the equipment failure rate. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a perspective view of the overall structure of this utility model;

[0016] Figure 2 This is an enlarged view of the structure of the wire-cutting mechanism and the pressure foot lifting mechanism of this utility model;

[0017] Legend:

[0018] 1. Sewing machine body; 2. Servo motor; 3. Thread cutting mechanism; 301. First rotating rod; 302. Swing rod; 303. First abutment part; 304. First connecting rod; 305. Second connecting rod; 306. Mounting block; 307. Second rotating rod; 308. Cutting blade; 4. Presser foot lifting mechanism; 401. Third rotating rod; 402. Linkage component; 403. Second abutment part; 404. Linkage rod; 405. Long rod; 406. Presser foot; 5. Drive mechanism; 501. First drive part; 502. Second drive part; 6. First torsion spring; 7. Second torsion spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Specific implementation examples are given below.

[0021] Please see Figures 1-2The present invention discloses a sewing machine presser foot lifting and thread cutting integrated transmission mechanism, comprising a sewing machine body 1 and a servo motor 2. The servo motor 2 is fixedly mounted on one side of the sewing machine body 1. The sewing machine body 1 is equipped with a thread cutting mechanism 3 for cutting thread and a presser foot lifting mechanism 4 for lifting the presser foot. A drive mechanism 5 is mounted on the output end of the servo motor 2. The drive mechanism 5 is equipped with a first drive part 501 for driving the thread cutting mechanism 3 to cut thread and a second drive part 502 for driving the presser foot lifting mechanism 4 to lift thread. The drive mechanism 5 includes a transmission disk 503 fixedly mounted on the output end of the servo motor 2. Both the first drive part 501 and the second drive part 502 are mounted on the transmission disk 503. The thread cutting mechanism 3 includes a swing rod 302 rotatably mounted on one side of the sewing machine body 1 via a first rotating rod 301. One end of the swing rod 302 is a first abutment part 303 that cooperates with the first drive part 501. The other end of the swing rod 302... One end of the sewing machine body 1 is rotatably equipped with a first connecting rod 304, and the other end of the first connecting rod 304 is rotatably equipped with a second connecting rod 305. A second rotating rod 307 is rotatably equipped on the sewing machine body 1 via a mounting block 306. One end of the second connecting rod 305 is rotatably connected to the second rotating rod 307. A cutter 308 is fixedly mounted on the second rotating rod 307. The presser foot lifting mechanism 4 includes a linkage 402 rotatably mounted on the sewing machine body 1 via a third rotating rod 401. The linkage 402 is provided with a second abutment 403 that cooperates with the second drive part 502. A linkage rod 404 is fixedly provided on the other end of the third rotating rod 401. A long rod 405 is fixedly mounted on the other end of the linkage rod 404. A presser foot 406 for pressing the fabric is mounted on the other end of the long rod 405. A forward and reverse drive controller is provided on the servo motor 2. The forward and reverse rotation of the servo motor 2 can drive the thread cutting mechanism 3 and the presser foot lifting mechanism 4 to perform thread cutting or presser foot lifting actions, respectively.During operation, when thread cutting is required during sewing, the operator controls the forward and reverse drive controller to make the servo motor 2 rotate forward. The output shaft of the servo motor 2 drives the transmission disk 503, which is fixedly connected to it, to rotate synchronously. The first drive part 501 on the transmission disk 503 begins to move as the transmission disk 503 rotates. When the first drive part 501 rotates to contact the first abutment part 303 of the swing arm 302, the first drive part 501 applies a pushing force to the first abutment part 303. Since the swing arm 302 is rotatably mounted on the sewing machine body 1 through the first rotating rod 301, this pushing force causes the swing arm 302 to rotate around... The first rotating rod 301 makes a circular motion. The rotation of the swing rod 302 is transmitted to the second connecting rod 305 through the first connecting rod 304. The rotational connection between the first connecting rod 304 and the second connecting rod 305 ensures the effective transmission of force and the conversion of the direction of motion. Under the drive of the first connecting rod 304, the second connecting rod 305 drives the second rotating rod 307 to rotate around the rotating point on the mounting block 306 mounted on the sewing machine body 1. Since the cutter 308 is fixed on the second rotating rod 307, the rotation of the second rotating rod 307 directly drives the cutter 308 to move to the sewing thread position. The cutting edge of the cutter 308 is used to cut the sewing thread, completing the thread cutting action.

[0022] When it is necessary to lift the presser foot 406 to change or adjust the fabric, the operator operates the forward / reverse drive controller again, causing the servo motor 2 to rotate in the reverse direction. The transmission disc 503 rotates in the reverse direction along with the motor output shaft, and the second drive unit 502 on it moves accordingly. When the second drive unit 502 rotates to contact the second abutment part 403 of the linkage 402, the second drive unit 502 applies a thrust to the second abutment part 403. Under the action of this thrust, the linkage 402 rotates around the third rotating rod 401. The rotation of the linkage 402 is transmitted to the long rod 405 through the linkage rod 404 fixedly connected to it. Since the linkage rod 404 and the long rod 405 are rigidly connected, the rotation of the linkage 402... The movement of the rod 405 causes the long rod 405 to move upward, which in turn lifts the presser foot 406, allowing the fabric to be easily replaced or its position adjusted. Through the structural optimization of this invention, the lifting of the presser foot and the cutting of the thread are achieved through mechanical transmission, resulting in smooth operation and effectively reducing noise interference, creating a quieter working environment for the operator. Furthermore, this invention utilizes a servo motor 2 paired with a forward and reverse drive controller, which can quickly and accurately respond to operating commands, driving the thread cutting mechanism 3 and the presser foot lifting mechanism 4 to act promptly, greatly improving work efficiency. At the same time, it can maintain a stable working state even under long-term high-frequency use, reducing the equipment failure rate.

[0023] Furthermore, a first torsion spring 6 for driving the swing arm 302 to reset is fitted on the first rotating rod 301, with both ends of the first torsion spring 6 abutting against the swing arm 302 and one side of the sewing machine body 1, respectively. A second torsion spring 7 for driving the linkage 402 to reset is fitted on the third rotating rod 401, with both ends of the second torsion spring 7 abutting against the linkage 402 and one side of the sewing machine body 1, respectively. During operation, after the thread cutting action is completed, the servo motor 2 controls the first driving part 501 to rotate away from the first abutting part 303. The first driving part 501 and the swing arm 302... The first contact part 303 separates, at which point the swing arm 302 is no longer pushed by the first drive part 501. Previously, during the wire cutting process, when the swing arm 302 rotated around the first rotating rod 301, the first torsion spring 6 was twisted and stored elastic potential energy. When the external force disappears, the first torsion spring 6 begins to release elastic potential energy, generating a reverse torque. This torque acts on the swing arm 302, causing the swing arm 302 to rotate in the opposite direction around the first rotating rod 301 until the swing arm 302 returns to its initial position. During this process, the elastic force of the first torsion spring 6 is transmitted through the swing arm 302, the first connecting rod 304, and the second connecting rod 501. The lever 305 transmits power, causing the second rotating lever 307 and the cutter 308 to return to their initial positions, preparing for the next wire cutting operation. After the presser foot lifting action is completed, the second drive unit 502, driven by the servo motor 2, rotates away from the second abutment part 403, separating it from the second abutment part 403 of the linkage 402. The linkage 402 is no longer subjected to the thrust of the second drive unit 502. Previously, during the presser foot lifting process, when the linkage 402 rotated around the third rotating lever 401, the second torsion spring 7 was torn, storing elastic potential energy. When the external force disappears, the second torsion spring 7 releases its elastic potential energy. The potential energy generates a reverse torque, which acts on the linkage 402, causing the linkage 402 to rotate in the opposite direction around the third rotating rod 401. The reverse rotation of the linkage 402 is transmitted through the linkage rod 404 and the long rod 405, causing the presser foot 406 to fall back to the initial position of pressing the fabric, completing the reset process of the presser foot lifting mechanism 4. This utility model achieves automatic reset and continuous operation through the design and cooperation of the above structure, which greatly improves the continuity and efficiency of sewing machine operation, allowing operators to focus more on sewing work and reducing the tediousness and time cost of operation.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] 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 claimed utility model.

Claims

1. A sewing machine presser foot lifting and thread cutting integrated transmission mechanism, comprising a sewing machine body (1) and a servo motor (2), characterized in that: The servo motor (2) is fixedly mounted on one side of the sewing machine body (1). The sewing machine body (1) is equipped with a thread-cutting mechanism (3) for cutting thread and a presser foot lifting mechanism (4) for lifting the presser foot. The output end of the servo motor (2) is equipped with a drive mechanism (5). The drive mechanism (5) is equipped with a first drive part (501) for driving the thread-cutting mechanism (3) to cut thread and a second drive part (502) for driving the presser foot lifting mechanism (4) to lift. When the first drive part (501) rotates to contact the first abutment part (303) of the swing arm (302), the first drive part (501) applies a pushing force to the first abutment part (303). This pushing force causes the swing arm (302) to make a circular motion around the first rotating rod (301) and transmits it to the second drive part (304) through the first connecting rod (304). The connecting rod (305) drives the second rotating rod (307) to rotate around the rotating point on the mounting block (306) mounted on the sewing machine body (1). The second rotating rod (307) is fixedly equipped with a cutter (308). Since the cutter (308) is fixed on the second rotating rod (307), the rotation of the second rotating rod (307) directly drives the cutter (308) to move to the sewing position and complete the thread cutting action. When the second drive unit (502) rotates to contact the second abutment part (403) of the linkage (402), the second drive unit (502) applies a pushing force to the second abutment part (403). The rotation of the linkage (402) will drive the long rod (405) to move upward. The upward movement of the long rod (405) directly drives the presser foot (406) to lift, so that the fabric can be easily replaced or its position adjusted.

2. The sewing machine presser foot lifting and thread cutting integrated transmission mechanism according to claim 1, characterized in that: The thread-cutting mechanism (3) includes a swing arm (302) rotatably mounted on one side of the sewing machine body (1) via a first rotating rod (301). One end of the swing arm (302) is a first abutting part (303) that cooperates with the first driving part (501). The other end of the swing arm (302) is rotatably mounted with a first connecting rod (304). The other end of the first connecting rod (304) is rotatably mounted with a second connecting rod (305). The sewing machine body (1) is rotatably mounted with a second rotating rod (307) via a mounting block (306). One end of the second connecting rod (305) is rotatably connected to the second rotating rod (307).

3. The sewing machine presser foot lifting and thread cutting integrated transmission mechanism according to claim 2, characterized in that: The presser foot lifting mechanism (4) includes a linkage (402) rotatably mounted on the sewing machine body (1) via a third rotating rod (401). The linkage (402) is provided with a second abutment (403) that cooperates with the second drive unit (502). A linkage rod (404) is fixedly mounted at the other end of the third rotating rod (401). A long rod (405) is fixedly mounted at the other end of the linkage rod (404). A presser foot (406) for pressing the fabric is mounted at the other end of the long rod (405).

4. The sewing machine presser foot lifting and thread cutting integrated transmission mechanism according to claim 1, characterized in that: The drive mechanism (5) includes a transmission disk (503) fixedly mounted on the output end of the servo motor (2), and the first drive unit (501) and the second drive unit (502) are both mounted on the transmission disk (503).

5. The sewing machine presser foot lifting and thread cutting integrated transmission mechanism according to claim 1, characterized in that: The servo motor (2) is equipped with a forward and reverse drive controller. The forward and reverse rotation of the servo motor (2) can drive the wire cutting mechanism (3) and the pressure foot lifting mechanism (4) to perform wire cutting or pressure foot lifting actions respectively.

6. The sewing machine presser foot lifting and thread cutting integrated transmission mechanism according to claim 3, characterized in that: The first rotating rod (301) is fitted with a first torsion spring (6) for driving the swing arm (302) to reset. The two ends of the first torsion spring (6) abut against the swing arm (302) and the sewing machine body (1) respectively. The third rotating rod (401) is fitted with a second torsion spring (7) for driving the linkage (402) to reset. The two ends of the second torsion spring (7) abut against the linkage (402) and the sewing machine body (1) respectively.

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