Presser foot lifting and thread loosening transmission device of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a presser foot lifting and thread loosening transmission device of a sewing machine, which comprises a presser foot lifting transmission mechanism and a thread loosening transmission mechanism which are assembled on a machine head, and a turntable for driving the presser foot lifting transmission mechanism and the thread loosening transmission mechanism to act, a guide rail through groove is formed in the rotary table, a transverse section and an arc section of the guide rail through groove are used for presser foot lifting and thread loosening operation respectively, the linkage swing rod is assembled on one side of the machine head in a rotating mode, and a second idler wheel of the linkage swing rod is matched with an arc-shaped guide groove of the rotary table to achieve thread loosening. The mechanical structure is greatly simplified, the mechanism compactness is improved, precise and independent control over presser foot lifting and thread loosening actions is achieved, energy consumption is reduced, the response speed is increased, and maintenance is convenient.

Description

A sewing machine presser foot lifting and thread loosening transmission device Technical Field

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

[0002] Sewing machines are essential equipment for sewing clothes and fabrics. They can quickly and accurately sew fabrics together and are widely used in the mass production of clothing, bags, etc. They are indispensable tools in the textile and apparel industry. The presser foot device is an important component to ensure the smooth feeding of fabric during the sewing process and to make the stitches even and neat. The thread loosening mechanism is also an important component. During the sewing machine's actions such as backstitching, starting a stitch, or ending a stitch, the thread is briefly loosened to ensure a smooth thread supply and maintain a stable sewing process.

[0003] The existing presser foot lifting and thread loosening transmission mechanisms have the following drawbacks: due to the limitations of the covert sewing machine structure, the thread loosening mechanism and the presser foot lifting mechanism are not on the same plane, so the transmission structure in the existing technology is often cumbersome when using the same power source to drive the thread loosening mechanism and the presser foot lifting mechanism. Therefore, in order to solve the above problems, a sewing machine presser foot lifting and thread loosening transmission device is proposed. Summary of the Invention

[0004] To overcome the shortcomings of existing presser foot lifting and thread loosening transmission mechanisms, a presser foot lifting and thread loosening transmission device for sewing machines is proposed.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The sewing machine presser foot lifting and thread loosening transmission device of this utility model includes a presser foot lifting transmission mechanism and a thread loosening transmission mechanism assembled on the machine head. One end of the presser foot lifting transmission mechanism is linked to a guide rail plate, and one end of the thread loosening transmission mechanism is linked to a linkage swing rod. A turntable is provided on one side of the machine head through a driving device for driving the guide rail plate and the linkage swing rod to perform presser foot lifting and thread loosening operations respectively.

[0006] Preferably, the guide rail plate has a guide rail groove, and the turntable is equipped with a first roller that cooperates with the guide rail groove and is eccentrically arranged. The guide rail groove includes a horizontal section that cooperates with the first roller to perform the lifting of the pressure foot operation, and an arc section that cooperates with the first roller to perform the loosening of the line operation.

[0007] Preferably, the linkage lever is rotatably mounted on one side of the machine head, and a second roller is mounted on one end of the linkage lever. The turntable has an arc-shaped guide groove that cooperates with the second roller to perform the line loosening operation. When the second roller enters the arc-shaped guide groove, the first roller is located in the arc segment. When the first roller is located in the horizontal segment, the second roller is located in the end plane of the turntable.

[0008] Preferably, a first tension spring is connected between the linkage lever and the machine head to make the second roller abut against the turntable.

[0009] Preferably, a second tension spring is connected between the guide rail plate and the machine head to reset the guide rail plate.

[0010] Preferably, the drive device for the turntable is a servo motor, which is controlled by a controller mounted on the machine head.

[0011] The beneficial effects of this utility model are:

[0012] 1. Highly integrated structure: A single power source drives a non-coplanar mechanism, eliminating complex cross-plane transmission components, significantly simplifying the structure, improving the compactness of the mechanism, and adapting to compact head designs;

[0013] 2. Precise and independent action: The forward and reverse rotation of the turntable controls the lifting of the presser foot and the loosening of the thread respectively, realizing the separation of timing, avoiding interference, ensuring precise coordination between the lifting of the presser foot and the tension of the loosening thread, and improving sewing stability. 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 is a three-dimensional structural view of the present invention.

[0016] Figure 2 is a three-dimensional structural view of the guide rail plate, linkage swing rod, and turntable of this utility model;

[0017] Figure 3 is a side view of the three-dimensional structure of Figure 2;

[0018] Legend:

[0019] 1. Machine head; 2. Presser foot lifting transmission mechanism; 201. First connecting rod; 202. Second connecting rod; 203. Rotating rod; 204. Presser foot; 205. Third roller; 3. Wire loosening transmission mechanism; 301. Wire clamping disc; 302. Cam; 303. Third connecting rod; 304. Fourth connecting rod; 4. Guide rail plate; 401. Guide rail through groove; 4011. Horizontal section; 4012. Arc section; 5. Linkage swing rod; 501. Second roller; 6. Turntable; 601. First roller; 602. Arc-shaped guide groove; 603. End plane; 7. First tension spring; 8. Second tension spring; 9. Servo motor. Detailed Implementation

[0020] 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.

[0021] Specific implementation examples are given below.

[0022] Please refer to Figures 1-3. The sewing machine presser foot lifting and thread loosening transmission device of this utility model includes a presser foot lifting transmission mechanism 2 and a thread loosening transmission mechanism 3 mounted on the machine head 1. One end of the presser foot lifting transmission mechanism 2 is linked to a guide rail plate 4, and one end of the thread loosening transmission mechanism 3 is linked to a linkage swing rod 5. A turntable 6 is provided on one side of the machine head 1 via a driving device for driving the guide rail plate 4 and the linkage swing rod 5 to perform presser foot lifting and thread loosening operations respectively. The driving device of the turntable 6 is a servo motor 9, which is controlled by a controller provided on the machine head 1. The guide rail plate 4 has a guide rail groove 401. The turntable 6 is equipped with a first roller 601 that cooperates with the guide rail groove 401 and is eccentrically arranged. The guide rail groove 401 includes a horizontal section 4011 that cooperates with the first roller 601 to perform presser foot lifting operation and an arc section 4012 that cooperates with the first roller 601 to perform thread loosening operation.

[0023] The linkage lever 5 is rotatably mounted on one side of the machine head 1. One end of the linkage lever 5 is equipped with a second roller 501. The turntable 6 is provided with an arc-shaped guide groove 602 that cooperates with the second roller 501 to perform the line loosening operation. When the second roller 501 enters the arc-shaped guide groove 602, the first roller 601 is located in the arc segment 4012. When the first roller 601 is located in the horizontal segment 4011, the second roller 501 is located in the end plane 603 of the turntable 6.

[0024] The presser foot lifting transmission mechanism 2 includes a first connecting rod 201 assembled and connected to the guide rail plate 4, a second connecting rod 202 rotatably mounted on one side of the first connecting rod 201, and a rotating rod 203 rotatably mounted on the machine head 1 via a fixed frame. One end of the second connecting rod 202 is rotatably connected to one side of the rotating rod 203. It also includes a presser foot 204 rotatably mounted on the machine head 1. A third roller 205 is mounted on one side of the presser foot 204. One end of the rotating rod 203 has an arc-shaped chamfer, and the arc-shaped chamfer abuts against the third roller 205. A return spring is connected between the presser foot 204 and the machine head 1.

[0025] The wire loosening transmission mechanism 3 includes a wire clamping disc 301 mounted on the machine head 1. The wire clamping disc 301 includes an upper disc and a lower disc. A connecting rod on the upper disc slides into the inner cavity of the machine head 1. It also includes a cam 302 rotatably mounted inside the machine head 1. The driving surface of the cam 302 abuts against the connecting rod on the upper disc. A third connecting rod 303 is mounted on one side of the cam 302. A fourth connecting rod 304 is rotatably mounted on the other end of the third connecting rod 303. The other end of the fourth connecting rod 304 is rotatably connected to the linkage swing rod 5.

[0026] During operation, initially, turntable 6 is stationary, the first roller 601 is located at the horizontal section 4011 of the guide rail groove 401, and the presser foot 204 presses the fabric under the action of the return spring. The upper and lower plates of the thread clamping plate 301 clamp the sewing thread. When it is necessary to lift the presser foot, the servo motor 9 drives the turntable 6 to rotate clockwise according to the preset program in the direction shown in Figure 1. The first roller 601 moves to the right along the horizontal section 4011 and pushes the guide rail plate 4 to swing counterclockwise. The guide rail plate 4 drives the first connecting rod 201 and pulls the second connecting rod. When rod 202 moves, the second connecting rod 202 drives the rotating rod 203 to rotate counterclockwise around the fixed frame. The arc-shaped chamfer of the rotating rod 203 lifts the third roller 205 of the pressure foot 204, causing the pressure foot 204 to rise against the return spring force, completing the lifting action. At this time, the second roller 501 is located at the end plane 603 of the turntable 6, and the wire loosening mechanism is not triggered. When a wire loosening operation is required, the servo motor 9 controls the turntable 6 to rotate counterclockwise in the opposite direction to the rotation direction when lifting the pressure foot. As the turntable 6 rotates in the opposite direction, the first roller 601... 1. When the guide rail plate 4 enters the arc section 4012 from the horizontal section 4011 of the guide rail slot 401, the guide rail plate 4 will return clockwise. At the same time, during the reversal of the turntable 6, the second roller 501 will fall into the arc-shaped guide groove 602 of the turntable 6. The arc-shaped guide groove 602 constrains the second roller 501. The turntable 6 continues to rotate, causing the linkage rocker arm 5 to swing clockwise around its fulcrum. At the same time as the turntable 6 reverses, due to the special shape of the arc section 4012, the arc section 4012 becomes the first roller 601. The arc-shaped motion provides the movement space. The clockwise swing of the linkage lever 5 pulls the third linkage 303 through the fourth linkage 304. During the pulling process, the third linkage 303 drives the cam 302 to rotate. The cam 302 has a driving surface with a specific shape. As the cam 302 rotates, its driving surface lifts the connecting rod of the upper plate in the thread clamping plate 301. Since the connecting rod of the upper plate is lifted, the upper plate of the thread clamping plate 301 separates from the lower plate, and the originally clamped thread is released, thus realizing the thread loosening operation.

[0027] The lifting of the presser foot and the loosening of the thread are achieved through the rotation and trajectory of the turntable 6 in different directions, thus achieving "time-separation". By controlling the forward and reverse rotation of the turntable 6, the lifting of the presser foot and the loosening of the thread are realized separately, making the control of the two actions more precise and independent. This utility model integrates non-coplanar motion into the same power source through a single turntable 6 composite trajectory drive, simplifying the traditional complex transmission structure, significantly improving the compactness and reliability of the mechanism, eliminating the interference risk and "dead point" problem of cross-plane transmission, ensuring precise coordination between the lifting of the presser foot and the loosening of the thread. The single servo motor 9 drive scheme reduces energy consumption, improves response speed, adapts to compact equipment layout, and is easy to maintain. By adjusting the trajectory parameters, it can be quickly adapted to different models, breaking through the constraints of space on transmission design, and improving the efficiency and versatility of the core mechanism of the sewing machine.

[0028] Furthermore, a first tension spring 7 is connected between the linkage lever 5 and the machine head 1 to make the second roller 501 abut against the turntable 6. During operation, when the second roller 501 is located at the end plane 603 of the turntable 6, the tension of the first tension spring 7 keeps the linkage lever 5 at its initial angle, ensuring that the second roller 501 is in contact with the surface of the turntable 6 and eliminating mechanical gaps. When the second roller 501 enters the arc-shaped guide groove 602, the linkage lever 5 swings, causing the first tension spring 7 to be compressed. After the slack line action is completed, the first tension spring 7 releases its elastic potential energy to drive the linkage lever 5 to quickly reset, preparing for the next cycle action.

[0029] Furthermore, a second tension spring 8 is connected between the guide rail plate 4 and the machine head 1 to reset the guide rail plate 4. During operation, when the turntable 6 drives the first roller 601 to rotate and push the guide rail plate 4 to swing, the second tension spring 8 is stretched and stores elastic potential energy. When the first roller 601 moves from the horizontal section 4011 to the arc section 4012, the second tension spring 8 releases its potential energy, assisting in driving the guide rail plate 4 to reset clockwise. With the fast response of the servo motor 9, the overall working efficiency of the machine is improved.

[0030] 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.

[0031] 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 loosening transmission device, comprising a presser foot lifting transmission mechanism (2) and a thread loosening transmission mechanism (3) mounted on the machine head (1), characterized in that: One end of the lifting press foot transmission mechanism (2) is linked to a guide rail plate (4), and one end of the loosening transmission mechanism (3) is linked to a linkage swing rod (5). A turntable (6) is provided on one side of the machine head (1) via a drive device to drive the guide rail plate (4) and the linkage swing rod (5) to perform lifting press foot and loosening operations respectively.

2. The presser foot and thread tension release drive for a sewing machine according to claim 1, wherein: The guide rail plate (4) is provided with a guide rail groove (401), and the turntable (6) is equipped with a first roller (601) that cooperates with the guide rail groove (401) and is eccentrically arranged. The guide rail groove (401) includes a horizontal section (4011) that cooperates with the first roller (601) to perform the lifting of the presser foot operation, and an arc section (4012) that cooperates with the first roller (601) to perform the loosening of the line operation.

3. The sewing machine presser foot lifting and thread loosening transmission device according to claim 1, characterized in that: The linkage lever (5) is rotatably mounted on one side of the machine head (1). One end of the linkage lever (5) is equipped with a second roller (501). The turntable (6) has an arc-shaped guide groove (602) that cooperates with the second roller (501) to perform the line loosening operation. When the second roller (501) enters the arc-shaped guide groove (602), the first roller (601) is located in the arc segment (4012). When the first roller (601) is located in the horizontal segment (4011), the second roller (501) is located in the end plane (603) of the turntable (6).

4. The presser foot-lifting and thread-relaxing transmission device of a sewing machine according to claim 1, characterized in that: A first tension spring (7) is connected between the linkage lever (5) and the machine head (1) to make the second roller (501) abut against the turntable (6).

5. The presser foot and thread tension release drive for a sewing machine according to claim 1, wherein: A second tension spring (8) is connected between the guide rail plate (4) and the machine head (1) to reset the guide rail plate (4).

6. The sewing machine presser foot lifting and thread loosening transmission device according to claim 1, characterized in that: The drive device for the turntable (6) is a servo motor (9), which is controlled by a controller set on the machine head (1).

Images