Presser foot device of sewing machine

Abstract

The utility model discloses a presser foot device of a sewing machine, which comprises a presser foot rod capable of lifting, the lower end of the presser foot rod is connected with a bowl-shaped presser foot, and a stepping motor used for driving the presser foot rod to lift is arranged on one side of a sewing machine head. The material pressing height of the presser foot is controlled through the stepping motor, the sewing requirements of cloth with different thicknesses can be met, and the sewing quality is improved.

Description

Technical Field

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

[0002] The invention patent with the patent number of 202020379150.9 discloses a presser foot assembly of a sewing machine, including a mounting plate and a presser foot, a driving member is fixedly provided on the mounting plate, an adapter plate is provided on the output shaft of the driving member, and the driving member can drive the adapter plate to move up and down reciprocatingly, and a through hole is opened on the connecting plate, a rotating shaft is passed through the through hole, and a mounting seat 1 and a mounting seat 2 are respectively connected to the rotating shaft, and the presser foot is connected to the mounting seat 1, and when there is an uneven place when pressing the cloth, the presser foot can be tightly attached to the cloth under the tension of the spring. When the sewing cloth is uneven, the rotating shaft can rotate at any angle with the joint bearing in the joint bearing, so that the presser foot can change with the inclination of the template surface. Due to the setting of the spring, the joint bearing and the rotating shaft, the ability of the presser foot to automatically adjust is improved, so that the presser foot always slides parallel to the template surface, avoiding the phenomenon of template deformation and cloth displacement. There are certain defects in the content disclosed in this patent. The device controls the height of the presser foot through a cylinder, and the height of the presser foot cannot be freely adjusted. When the thickness difference of the fabric is too large, the device cannot be used. Summary of the invention

[0003] In view of the above technical problems, the utility model provides a presser foot device for a sewing machine, which can accurately control the material pressing height of the presser foot according to the thickness of the sewing material and adapt to the sewing requirements of different sewing materials.

[0004] The utility model solves the above technical problems by adopting the following technical solution: a presser foot device of a sewing machine comprises a presser foot rod which can be raised and lowered, a bowl-shaped presser foot is connected to the lower end of the presser foot rod, and a stepping motor for driving the presser foot rod to be raised and lowered is arranged on one side of the sewing machine head.

[0005] In order to optimize the above technical solution, the utility model also includes the following improved technical solution.

[0006] The power output shaft of the stepper motor is connected with a transmission screw, and a transmission nut on the transmission screw is connected with the presser foot rod through a presser foot transmission plate.

[0007] The presser foot device is provided with a guide fixing plate connected to the front part of the sewing machine housing, the guide fixing plate is provided with a guide track through a track mounting plate, and the guide slide block on the guide track is connected to the presser foot transmission plate.

[0008] The presser foot device is provided with a top plate for installing a stepper motor, a presser foot fixing plate and a fixed connecting plate; the fixed connecting plate is installed with a positioning sensor, and the presser foot transmission plate is installed with a positioning piece matched with the positioning sensor.

[0009] A positioning connecting lower plate is connected below the fixed connecting plate, and a presser foot limiting column is arranged on the positioning connecting lower plate.

[0010] Compared with the prior art, the presser foot device for a sewing machine of the utility model controls the material pressing height of the presser foot through a stepping motor, can adapt to the sewing requirements of fabrics of different thicknesses, and improves the sewing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall three-dimensional structure of an embodiment of the utility model.

[0012] Figure 2 It is a three-dimensional structural schematic diagram of the presser foot device of the utility model.

[0013] Figure 3 yes Figure 2 Schematic diagram from another perspective. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings.

[0015] Figures 1 to 3 Shown is a schematic structural diagram of the utility model.

[0016] The accompanying drawings are marked as follows: guide fixing plate 1, track mounting plate 2, guide track 3, presser foot transmission plate 4, transmission nut 5, transmission screw 6, stepper motor mounting plate 7, top plate 8, presser foot fixing plate 9, fixed connecting plate 10, stepper motor 11, positioning connecting upper plate 12, positioning sensor 13, positioning piece 14, positioning connecting lower plate 15, guide slider 16, presser foot connecting plate 17, bowl-shaped presser foot 18, presser foot rod 19, presser foot limiting column 20.

[0017] The utility model discloses a presser foot device for a sewing machine, comprising a stepping motor 11 and a presser foot rod 19. The stepping motor 11 drives a presser foot transmission plate 4 to move up and down through a transmission screw 6. The presser foot transmission plate 4 drives a presser foot connecting plate 17 to move. The presser foot transmission plate 4 drives the presser foot rod 19 to move up and down through the presser foot connecting rod, thereby realizing the presser foot lifting function and specifically controlling the height of the presser foot according to the size of the cloth.

[0018] like Figure 1 , Figure 2 and Figure 3As shown, a presser foot fixing plate 9 is installed on the side of the front part of the sewing machine housing, and the presser foot fixing plate 9 is fixedly connected to the top plate 8, and the top plate 8 is fixedly connected to the fixed connecting plate 10. The fixed connecting plate 10 is equipped with a stepper motor 11 through the stepper motor mounting plate 7, and the stepper motor mounting plate 7 has a through hole for the transmission nut 5 to pass through. The lower part of the fixed connecting plate 10 is fixedly connected to the positioning connecting upper plate 12, and the positioning connecting upper plate 12 is fixedly connected to the positioning connecting lower plate 15, and a positioning sensor 13 is installed at the connection between the positioning connecting upper plate 12 and the positioning connecting lower plate 15, and a presser foot limiting column 20 is installed on the positioning connecting lower plate 15 to limit the lowest position of the presser foot transmission plate 4 when the presser foot transmission plate 4 moves downward.

[0019] The front part of the sewing machine housing is provided with a guide fixing plate 1, the guide fixing plate 1 is provided with a guide track 3 through a track mounting plate 2, the guide track 3 is slidably connected with a guide slider 16, the guide slider 16 is fixedly connected with a presser foot transmission plate 4, one end of the presser foot transmission plate 4 is provided with a transmission nut 5 and a threaded hole for a transmission screw 6 to pass through, and the other end is provided with a positioning plate 14, which is sensed by a positioning sensor 13 when the presser foot transmission plate 4 is raised, and the position of the sensor is recorded as a zero point for movement each time the machine is running, and different positions are recorded with the zero point as a reference point according to different needs, so as to ensure that the position reached each time will not deviate; when the positioning sensor 13 senses, the positioning sensor 13 controls the stepping motor 11 to stop rotating, and the stepping motor 11 controls the presser foot transmission plate 4 to stop rising. The lower end of the presser foot transmission plate 4 is fixedly connected with a presser foot connecting plate 17, and the presser foot connecting plate 17 is fixedly connected with a bowl-shaped presser foot 18 through a presser foot rod 19.

[0020] The stepper motor 11 drives the transmission screw 6 to rotate, and the transmission screw 6 drives the presser foot transmission plate 4 to move through the transmission nut 5. Since the guide slider 16 moves on the guide rail 3, the presser foot transmission plate 4 is also restricted from moving in other directions, and can only move longitudinally along the guide rail 3. The presser foot transmission plate 4 drives the presser foot connecting rod to rise and fall, and the presser foot connecting rod controls the lifting and lowering of the height of the bowl-shaped presser foot 18 through the presser foot rod 19.

[0021] The best embodiment of the present invention has been described, and various changes or modifications made by ordinary technicians in this field will not depart from the scope of the present invention.

Claims

1. A presser foot device for a sewing machine, comprising a presser foot rod (19) capable of being raised and lowered, wherein the lower end of the presser foot rod (19) is connected to a bowl-shaped presser foot (18), wherein: A stepper motor (11) for driving the presser foot rod (19) to rise and fall is arranged on one side of the sewing machine head; a power output shaft of the stepper motor (11) is connected with a transmission screw (6); a transmission nut (5) on the transmission screw (6) is connected with the presser foot rod (19) through a presser foot transmission plate (4).

2. The presser foot device according to claim 1, characterized in that: A guide fixing plate (1) connected to the front part of a sewing machine housing is provided. The guide fixing plate (1) is provided with a guide track (3) via a track mounting plate (2). A guide slide block (16) on the guide track (3) is connected to the presser foot transmission plate (4).

3. The presser foot device according to claim 2, characterized in that: A top plate (8) for mounting a stepping motor (11), a presser foot fixing plate (9) and a fixed connecting plate (10) are provided; the fixed connecting plate (10) is provided with a positioning sensor (13), and the presser foot transmission plate (4) is provided with a positioning piece (14) matched with the positioning sensor (13).

4. The presser foot device according to claim 3, characterized in that: A positioning connection lower plate (15) is connected below the fixed connection plate (10), and a presser foot limiting column (20) is mounted on the positioning connection lower plate (15).

Images