Foot pressing and lifting structure and sewing machine

Abstract

The utility model relates to the field of sewing machines, and discloses a presser foot lifting structure and a sewing machine, which comprises a driving motor, a transmission mechanism, a presser foot transmission arm, a pressing rod and a presser foot arm, the driving motor serves as a power source to provide a power source for the foot pressing and lifting mechanism; one end of the transmission mechanism is connected with the driving motor, the other end of the transmission mechanism is connected with the presser foot transmission arm, and the driving motor drives the presser foot transmission arm to move through the transmission mechanism; the head end of the presser foot transmission arm is connected with the transmission mechanism, the tail end of the presser foot transmission arm is connected with the pressing rod, the middle of the presser foot transmission arm is fixed to the machine body through a connecting shaft, and the presser foot transmission arm can be driven by the transmission mechanism to rotate around the connecting shaft. One end of the pressing rod is detachably connected with the presser foot arm, the presser foot transmission arm drives the pressing rod to move in the rotating process, and the pressing rod drives the presser foot arm to move. According to the device, the foot pressing and lifting actions can be realized, and the foot pressing arm can be separated.

Description

Technical Field

[0001] The utility model relates to the field of sewing machines, in particular to a foot presser and lifter structure and a sewing machine. Background Art

[0002] Chinese patent CN202011191737.8- discloses a presser foot lifting and thread cutting device for an overlock sewing machine, which is also called an edge machine, an edge machine, and a bone machine. The main function is generally to prevent the seams of clothing from fuzzing. Overlock sewing machines can not only be used for hemming, but also for sewing T-shirts, sportswear, underwear, knitwear and other fabrics. Overlock sewing machines can cut and sew at the same time, and the seams are like mesh, which is also suitable for elastic fabrics.

[0003] Overlock sewing machines often require the use of a presser foot lifting action to assist in sewing fabrics. The prior art all lifts the presser foot by rotating the presser foot shaft, but this technology cannot achieve the automatic disengagement of the presser foot arm. A method is now proposed that can perform a tooth lifting action and also achieve the automatic disengagement of the presser foot arm. Utility Model Content

[0004] The utility model aims at the shortcomings of the prior art and provides a foot-pressing and lifting structure.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] A presser foot lifting structure, comprising a driving motor, a transmission mechanism, a presser foot transmission arm, a press rod, and a presser foot arm;

[0007] The driving motor is used as a power source to provide power to the foot pressing and lifting mechanism;

[0008] The transmission mechanism is used as a transmission member, one end of which is connected to the driving motor and the other end is connected to the presser foot transmission arm. The driving motor drives the presser foot transmission arm to move through the transmission mechanism.

[0009] The head end of the presser foot transmission arm is connected to the transmission mechanism, and the end end is connected to the press rod. The middle part of the presser foot transmission arm is fixed to the machine body through a connecting shaft, and the presser foot transmission arm can rotate around the connecting shaft driven by the transmission mechanism.

[0010] One end of the pressure rod is detachably connected to the presser foot arm. The presser foot transmission arm drives the pressure rod to move during rotation, and the pressure rod drives the presser foot arm to move.

[0011] Preferably, it also includes a limit block, which is located on the movement path of the presser foot arm. In the initial state, there is a distance between the limit block and the presser foot arm. The rotation of the presser foot transmission arm drives the pressure rod to move, and the pressure rod drives the presser foot arm to approach the limit block. When the presser foot arm collides with the limit block, the pressure rod continues to move to disengage from the cooperation with the presser foot arm.

[0012] Preferably, the presser foot arm and the presser rod are connected magnetically.

[0013] Preferably, a notch is provided on the presser foot arm, a slot is provided at the lower end of the press rod, the slot is inserted into the notch, a magnetic steel is provided in the slot, and at least the notch portion of the presser foot arm is made of iron.

[0014] Preferably, a limit pin is provided on the pressure rod, and the end of the presser foot transmission arm is located at the lower side of the limit pin. When the presser foot transmission arm rotates, the end rotates upward to conflict with the limit pin.

[0015] Preferably, the end of the presser foot transmission arm is a hook-shaped structure, and the limit pin falls into the hook opening of the hook-shaped structure when in contact.

[0016] Preferably, the transmission mechanism is a cam structure, and the head end of the presser foot transmission arm contacts the cam; the head end of the presser foot transmission arm is provided with a contact plate, and the contact plate contacts the cam.

[0017] Preferably, the connecting shaft is a columnar structure with threads, and the connecting shaft is threadedly connected to the body.

[0018] Preferably, the limit block is located directly above the presser foot arm, and the presser foot arm is connected to the presser foot shaft.

[0019] A sewing machine, a presser foot lifting structure.

[0020] The utility model adopts the above technical solution, and has the following significant technical effects:

[0021] The presser foot lifting structure designed by the utility model can not only realize the normal presser foot lifting action, but also realize the automatic disengagement of the presser foot arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the device.

[0023] Figure 2 yes Figure 1 Exploded diagram.

[0024] The technical names of the accompanying drawings are: 100-motor, 200-transmission mechanism, 300-presser foot transmission arm, 400-pressing rod, 501-presser foot arm, 301-connecting shaft, 401-magnetic steel, 402-limiting pin, 500-presser foot shaft, 600-limiting block, 502-notch, 403-slot, 302-hook structure, 303-contact plate. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] Example 1

[0027] A presser foot lifting structure, comprising a driving motor 100, a transmission mechanism 200, a presser foot transmission arm 300, a press rod 400, and a presser foot arm 501;

[0028] The driving motor 100 is used as a power source to provide power to the foot pressing and lifting mechanism;

[0029] The transmission mechanism 200 is used as a transmission member, one end of which is connected to the driving motor 100, and the other end of which is connected to the presser foot transmission arm 300. The driving motor 100 drives the presser foot transmission arm 300 to move through the transmission mechanism 200; in this embodiment, the transmission mechanism 200 is a cam;

[0030] The head end of the presser foot transmission arm 300 is connected to the transmission mechanism 200, and the tail end is connected to the pressure rod 400. The middle part of the presser foot transmission arm 300 is fixed to the body through the connecting shaft 301. The presser foot transmission arm 300 can rotate around the connecting shaft 301 under the drive of the transmission mechanism 200. In this embodiment, the presser foot transmission arm 300 is a rod-shaped structure, one end of which is driven by the transmission mechanism 200, and the other end drives the pressure rod 400 to move, and the presser foot transmission arm 300 acts as a lever.

[0031] One end of the pressing rod 400 is detachably connected to the presser foot arm 501. The pressing rod 400 is driven to move during the rotation of the presser foot transmission arm 300, and the pressing rod 400 drives the presser foot arm 501 to move. In this embodiment, the pressing rod 400 is not connected to the presser foot transmission arm 300 in real time. Only when the rotating end of the presser foot transmission arm 300 contacts the pressing rod 400, the pressing rod 400 is connected to the pressing rod 400, thereby driving the pressing rod 400 to move.

[0032] The presser foot arm 501 also includes a limit block 600, which is located on the movement path of the presser foot arm 501. In the initial state, there is a distance between the limit block 600 and the presser foot arm 501, and the distance is used to realize the presser foot lifting action. The presser foot transmission arm 300 rotates to drive the press rod 400 to move, and the press rod 400 drives the presser foot arm 501 to approach the limit block 600. When the presser foot arm 501 collides with the limit block 600, the press rod 400 continues to move and disengages from the presser foot arm 501. In order to achieve reliable detachable connection, the presser foot arm 501 and the press rod 400 are connected by magnetism.

[0033] For ease of understanding, additional explanation is given on the connection transmission between the pressure rod 400 and the presser foot transmission arm 300. A limit pin 402 is provided on the pressure rod 400. The limit pin 402 is located on the side of the pressure rod 400 body. The end of the presser foot transmission arm 300 is located on the lower side of the limit pin 402. When the presser foot transmission arm 300 rotates, the end rotates upward and conflicts with the limit pin 402.

[0034] In order to ensure that the end of the presser foot transmission arm 300 is in stable contact and transmission with the limit pin 402 , the end of the presser foot transmission arm 300 is a hook-shaped structure 302 , and the limit pin 402 falls into the hook opening of the hook-shaped structure 302 when in contact.

[0035] In this scheme, the transmission mechanism 200 is a cam structure, and the head end of the presser foot transmission arm 300 is in conflict with the cam; the head end of the presser foot transmission arm 300 is provided with a contact plate 303, and the contact plate 303 is in conflict with the cam. When the presser foot is lifted, the motor 100 drives the cam to rotate, and the head of the presser foot transmission arm 300 is pressed down during the rotation of the cam, and the end rotates upward to drive the pressing rod 400, and the pressing rod 400 drives the presser foot arm 501 to realize the presser foot lifting action.

[0036] The stopper 600 is located directly above the presser foot arm 501, and the presser foot arm 501 is connected with the presser foot shaft 500. The presser foot lifting action can be adjusted by adjusting the position of the stopper 600.

[0037] The utility model adopts the above technical solution, and has the following significant technical effects:

[0038] The presser foot lifting structure designed in the utility model can not only realize the normal presser foot lifting action, but also realize the automatic escape of the presser foot arm 501.

[0039] Example 2

[0040] The difference between this embodiment and embodiment 1 is that a notch 502 is provided on the presser foot arm 501, a slot 403 is provided at the lower end of the press rod 400, the slot 403 is inserted into the notch 502, a magnet 401 is provided in the slot 403, and at least the notch 502 part of the presser foot arm 501 is made of iron.

[0041] Example 3

[0042] The difference between this embodiment and the first embodiment is that the connecting shaft 301 is a columnar structure with threads, and the connecting shaft 301 is threadedly connected to the body.

[0043] Example 4

[0044] A sewing machine comprises the above-mentioned presser foot lifting structure.

Claims

1. A presser foot lifting structure, characterized in that: It comprises a driving motor (100), a transmission mechanism (200), a presser foot transmission arm (300), a presser rod (400), and a presser foot arm (501); The driving motor (100) serves as a power source to provide a power source for the foot pressing and lifting mechanism; The transmission mechanism (200) serves as a transmission member, one end of which is connected to the driving motor (100) and the other end of which is connected to the presser foot transmission arm (300). The driving motor (100) drives the presser foot transmission arm (300) to move through the transmission mechanism (200); The head end of the presser foot transmission arm (300) is connected to the transmission mechanism (200), and the tail end is connected to the press rod (400). The middle part of the presser foot transmission arm (300) is fixed to the machine body through a connecting shaft (301). The presser foot transmission arm (300) can rotate around the connecting shaft (301) under the drive of the transmission mechanism (200); One end of the pressing rod (400) is detachably connected to the presser foot arm (501); during the rotation of the presser foot transmission arm (300), the pressing rod (400) is driven to move, and the pressing rod (400) drives the presser foot arm (501) to move.

2. A presser foot lifting structure according to claim 1, characterized in that: The invention also comprises a limit block (600), the limit block (600) is located on the movement path of the presser foot arm (501), and in an initial state, there is a distance between the limit block (600) and the presser foot arm (501), the presser foot transmission arm (300) drives the press rod (400) to move during the rotation process, and the press rod (400) drives the presser foot arm (501) to approach the limit block (600), and when the presser foot arm (501) contacts the limit block (600), the press rod (400) continues to move and disengages from the cooperation with the presser foot arm (501).

3. A presser foot lifting structure according to claim 1 or 2, characterized in that: The presser foot arm (501) and the press rod (400) are connected magnetically.

4. A presser foot lifting structure according to claim 3, characterized in that: The presser foot arm (501) is provided with a notch (502), the lower end of the press rod (400) is provided with a slot (403), the slot (403) is plugged into the notch (502), a magnetic steel (401) is provided in the slot (403), and at least the notch (502) portion of the presser foot arm (501) is made of iron.

5. A presser foot lifting structure according to claim 1 or 2, characterized in that: A limit pin (402) is arranged on the pressure rod (400), and the end of the presser foot transmission arm (300) is located at the lower side of the limit pin (402). When the presser foot arm (501) rotates, the end rotates upward to contact the limit pin (402).

6. A presser foot lifting structure according to claim 5, characterized in that: The end of the presser foot transmission arm (300) is a hook-shaped structure (302), and the limit pin (402) falls into the hook opening of the hook-shaped structure (302) when in contact.

7. A presser foot lifting structure according to claim 1 or 2, characterized in that: The transmission mechanism (200) is a cam structure, and the head end of the presser foot transmission arm (300) abuts against the cam; the head end of the presser foot transmission arm (300) is provided with an abutment plate (303), and the abutment plate (303) abuts against the cam.

8. A presser foot lifting structure according to claim 1 or 2, characterized in that: The connecting shaft (301) is a columnar structure with threads, and the connecting shaft (301) is threadedly connected to the machine body.

9. A presser foot lifting structure according to claim 2, characterized in that: The limit block (600) is located directly above the presser foot arm (501), and the presser foot arm (501) is connected with the presser foot shaft (500).

10. A sewing machine, characterized in that: Equipped with a presser foot lifting structure as described in any one of claims 1 to claim 9.

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