Presser foot lifting mechanism of sewing machine

Abstract

The utility model provides a presser foot lifting mechanism of a sewing machine, particularly relates to the technical field of sewing machine manufacturing, and provides the presser foot lifting mechanism of the sewing machine aiming at the problem that the sewing machine is difficult to sew sewing materials with different thicknesses at high quality, which is provided with a driving motor, a presser foot rod and a presser foot, and is characterized by also comprising an eccentric wheel connecting rod and a lever, an eccentric wheel connecting rod is fixed to a driving shaft of the driving motor and hinged to a lever, the other end of the lever is hinged to a guide movable block, the guide movable block is fastened to the middle of a presser foot rod, and a presser foot is connected to the lower end of the presser foot rod. The presser foot lifting mechanism is used for driving the presser foot rod provided with the presser foot to move up and down in the sewing process so that the presser foot can ascend or descend, the sewing requirements of sewing materials with different thicknesses can be met, the technical effect that the sewing material stitch density consistency is achieved on the sewing materials with different thicknesses as far as possible is achieved, and the sewing quality is improved.

Description

Technical Field

[0001] The present application provides a presser foot lifting mechanism for a sewing machine, and specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] The cooperation between the presser foot and the feed dog of the sewing machine realizes the smooth sewing of the sewing material. During the sewing process, the pressure exerted by the presser foot on the sewing material is constant and single, which is determined by the spring set on the presser foot rod. When the sewing material is thinner or thicker, the sewing speed of the sewing material will change, causing the sewing stitches to change, thus affecting the consistency of the stitches. The stitches in the thinner part will be longer, and the stitches in the thicker part will appear denser. Such a constant pressure under the presser foot causes stitches of inconsistent density in sewing materials of different thicknesses, reducing the sewing quality. Therefore, the existing lowered presser foot has a single height and cannot meet the diverse sewing needs.

[0003] A presser foot lifting mechanism of a sewing machine with the announcement number CN203668641U is proposed, which includes a rotating shaft, a presser foot rod, a transmission lever and a cylinder fixed on the sewing machine housing, wherein the transmission lever is hinged on the sewing machine housing, the rotating shaft is connected to the housing and can rotate around its axis, the rotating shaft and the piston rod of the cylinder are perpendicular to each other, a presser foot lifting cam is fixedly connected to the rotating shaft, which can drive the transmission lever to rotate when the rotating shaft rotates, a transmission assembly is provided between the rotating shaft and the cylinder, and a transmission structure is provided between the transmission lever and the presser foot rod, which can drive the presser foot rod to lift upward when the transmission lever rotates. This scheme has the advantage of high automation, but this scheme has the problems of high noise and the need for an additional air supply system, and at the same time, the presser foot lifting mechanism is also difficult to meet the high-quality sewing requirements for sewing materials of different thicknesses. Summary of the invention

[0004] The present application is aimed at the problem that the above-mentioned sewing machine is difficult to sew different thicknesses of sewing materials with high quality, and proposes a presser foot lifting mechanism of a sewing machine, which has a driving motor, a presser foot rod and a presser foot, and is characterized in that it also has an eccentric wheel connecting rod and a lever, the driving shaft of the driving motor is fixed with an eccentric wheel connecting rod, the eccentric wheel connecting rod is hinged to the lever, the other end of the lever is hinged to a guide movable block, the guide movable block is fastened to the middle position of the presser foot rod, and the lower end of the presser foot rod is connected to the presser foot, and the presser foot can be indirectly lifted or lowered by the operation of the above-mentioned driving motor, so as to solve the above-mentioned technical problems.

[0005] The lever is movably arranged on the housing by means of a screw, so that the lever can rotate freely.

[0006] The installation position of the above-mentioned guide movable block is lower than the position where the screw is fixed, so as to ensure that the lifting force of the lever can directly act on the guide movable block and the presser foot rod.

[0007] The driving motor is fixed on the rear housing of the sewing machine head, and the driving shaft of the driving motor extends into the interior of the rear housing.

[0008] The presser foot lifting mechanism of the present application is used to be installed on the sewing machine head. The rotation angle of the driving shaft of the driving motor is controlled by the control system of the sewing machine. The control system controls the rotation angle of the eccentric wheel connecting rod by setting the rotation angle of the driving shaft, and then controls the lifting and lowering distance of the presser foot rod and the presser foot through the lever.

[0009] The advantage of the present application lies in that the presser foot lifting mechanism of the present application is used to drive the presser foot rod equipped with the presser foot to move up and down during the sewing process, so as to realize the lifting or lowering of the presser foot, adapt to the sewing needs of sewing materials of different thicknesses, and achieve the technical effect of achieving consistency of sewing material stitch density on sewing materials of different thicknesses as much as possible, thereby improving the sewing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of a presser foot lifting mechanism of the present application.

[0011] The names of the parts indicated by the numbers in the above drawings are as follows:

[0012] 10. Driving motor; 11. Driving shaft; 21. Eccentric wheel connecting rod; 22. Lever; 221. Screw; 23. Guide movable block; 24. Presser foot rod; 25. Presser foot. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1 The embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0014] See also Figure 1 The presser foot lifting mechanism of this embodiment is used to be installed on the sewing machine head. The presser foot lifting mechanism is used to drive the presser foot rod 24 installed with the presser foot 25 to move up and down during the sewing process to realize the lifting or lowering of the presser foot 25, adapting to the sewing needs of sewing materials of different thicknesses, and achieving the technical effect of achieving consistency of sewing material stitch density on sewing materials of different thicknesses as much as possible.

[0015] The presser foot lifting mechanism of the present application includes a driving motor 10, an eccentric wheel connecting rod 21, a lever 22, a guide movable block 23, a presser foot rod 24 and a presser foot 25. The driving motor 10 is fixed on the rear housing of the sewing machine head, and the driving shaft 11 of the driving motor 10 extends into the rear housing. Inside the housing, an eccentric wheel connecting rod 21 is fixed on the driving shaft 11, and the eccentric wheel connecting rod 21 is hinged to the lever 22; the lever 22 is movably arranged on the housing by a screw 221, so that the lever 22 can rotate with the screw 221, and the other end of the lever 22 is hinged on the guide movable block 23, and the guide movable block 23 is fastened to the middle position of the presser foot rod 24, and the installation position of the guide movable block 23 is lower than the fixed position of the screw 221, and the lower end of the presser foot rod 24 is connected to the presser foot 25.

[0016] Since the rotation angle of the driving shaft 11 of the driving motor 10 is controlled by the control system of the sewing machine. For sewing materials of different thicknesses, the control system can control the rotation angle of the eccentric wheel connecting rod 21 by setting the rotation angle of the driving shaft 11, and then control the lifting and lowering distance of the presser foot rod 24 and the presser foot 25 through the lever 22, thereby solving the problem of the single lifting height of the presser foot of the presser foot lifting mechanism in the prior art. In addition, the driving motor 10 is a stepping motor.

[0017] The above is only one of the preferred implementation methods of the present application and is not intended to limit the present invention. The scope of the patent implementation of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made by using the shape, structure, and principle of the description and drawings of the present application, or directly or indirectly applied in other related technical fields; any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the patent protection scope of the present application.

Claims

1. A presser foot lifting mechanism for a sewing machine, comprising a drive motor (10), a presser foot rod (24) and a presser foot (25), It is characterized in that The invention also comprises an eccentric wheel connecting rod (21) and a lever (22). The driving motor (10) comprises a driving shaft (11). The driving shaft (11) is fixed with an eccentric wheel connecting rod (21). The eccentric wheel connecting rod (21) is hingedly connected to the lever (22). The other end of the lever (22) is hingedly connected to a guide movable block (23). The guide movable block (23) is fastened to the middle position of a presser foot rod (24). The lower end of the presser foot rod (24) is connected with a presser foot (25).

2. A presser foot lifting mechanism for a sewing machine according to claim 1, It is characterized in that The lever (22) is movably arranged on the housing by means of a screw (221).

3. A presser foot lifting mechanism for a sewing machine according to claim 1, It is characterized in that The installation position of the guide movable block (23) is lower than the fixing position of the screw (221).

4. A presser foot lifting mechanism for a sewing machine according to claim 1, It is characterized in that The driving motor (10) is fixed on the rear housing of the sewing machine head, and the driving shaft (11) extends into the interior of the rear housing.

5. A presser foot lifting mechanism for a sewing machine according to claim 1, It is characterized in that The presser foot lifting mechanism is used for being installed on a sewing machine head.

6. A presser foot lifting mechanism for a sewing machine according to claim 1, It is characterized in that The rotation angle of the driving shaft (11) of the driving motor (10) is controlled by a control system of the sewing machine. The control system controls the rotation angle of the eccentric wheel connecting rod (21) by setting the rotation angle of the driving shaft (11), and then controls the lifting and lowering distances of the presser foot rod (24) and the presser foot (25) through the lever (22).

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