WO2024113433A1

WO2024113433A1 - Presser foot lifting mechanism of sewing machine

Info

Publication number: WO2024113433A1
Application number: PCT/CN2022/139903
Authority: WO
Inventors: 毕兴国
Original assignee: 浙江美机缝纫机有限公司
Priority date: 2022-12-02
Filing date: 2022-12-19
Publication date: 2024-06-06
Also published as: CN115787203A

Abstract

Disclosed in the present invention are a presser foot lifting mechanism of a sewing machine, comprising a mounting frame, a transmission shaft, a swing shaft, a swing seat, a torsion spring, an ejector rod, and a presser foot assembly. The mounting frame is fixedly mounted at the bottom of a machine base of the sewing machine, the transmission shaft passes through the mounting frame, the swing shaft is connected to the machine base by means of a shaft sleeve, and a gear assembly forming a transmission connection is provided between the transmission shaft and the swing shaft; the swing seat is fixedly mounted on the swing shaft, the torsion spring is limitedly mounted at one end of the swing shaft by means of a circlip, and one end of the torsion spring is limited by the bottom of the machine base, and the other end is fastened on the swing seat; the lower end of the ejector rod is connected to the swing seat, and the upper end of the ejector rod is in linkage connection with the presser foot assembly by means of a swing crank and a pull rod. According to the present invention, the presser foot lifting mechanism is driven in a gear transmission manner, and the assembly manner of components is relatively simple; moreover, the physical output of an operator can be reduced by a gear output ratio, thereby realizing control with less effort, and avoiding idle running.

Description

A presser foot lifting mechanism for a sewing machine

Technical Field

The invention relates to the technical field of sewing machines, and in particular to a presser foot lifting mechanism of a sewing machine.

Background technique

The presser foot lifting mechanism is one of the basic mechanisms of conventional sewing machines. When sewing is completed, the presser foot needs to be lifted so that the sewing material can be taken out from under the presser foot. In the early sewing machines, the presser foot lifting action was manually pulled up by the presser foot lifting wrench, and later the right knee drove the knee rest device to drive the presser foot to lift. In recent years, with the continuous development of electronic technology, the application of motor presser foot lifting has gradually increased.

Among the above common presser foot lifting methods, the pure manual presser foot lifting method has been replaced. Currently, the most common method is to use the knee to drive other related parts to lift the presser foot. This mechanism technology is relatively mature and the cost is relatively low. The disadvantage is that it is relatively physically demanding. The most advanced is the motor presser foot lifting, and the touch type is the most labor-saving, but the cost is relatively high and it is suitable for high-end sewing machines. Therefore, a mechanism that can comprehensively make up for these defects is needed.

Summary of the invention

The purpose of the present invention is to solve the problems raised in the above background technology and to provide a presser foot lifting mechanism for a sewing machine.

In order to solve the above technical problems, the technical solution of the present invention is: a presser foot lifting mechanism of a sewing machine, comprising a mounting frame, a transmission shaft, a swing shaft, a swing seat, a torsion spring, a push rod, and a presser foot assembly;

The mounting frame is fixedly mounted on the bottom of the sewing machine base, the transmission shaft is inserted into the mounting frame, the swing shaft is connected to the base through a shaft sleeve, and a gear assembly forming a transmission connection is provided between the transmission shaft and the swing shaft; the swing seat is fixedly mounted on the swing shaft, and the torsion spring is limitedly mounted on the end of the swing shaft through a retaining spring, one end of the torsion spring is limited at the bottom of the base, and the other end is buckled on the swing seat; the lower end of the push rod is connected to the swing seat, and the upper end of the push rod is linked to the presser foot assembly through a swing crank and a pull rod.

In the above-mentioned presser foot lifting mechanism of a sewing machine, the gear assembly includes gear A and gear B, gear A is fixedly installed at the middle of the transmission shaft, and gear B is fixedly installed at one end of the swing shaft.

In the above-mentioned presser foot lifting mechanism of a sewing machine, the transmission shaft and the swing shaft are installed in a vertical relationship, and the gear A and the gear B are meshed with each other.

In the above-mentioned presser foot lifting mechanism of a sewing machine, the swing seat is a U-shaped structure, the axial hole at one end of the swing seat is fixedly connected to the swing shaft and fixed with screws, and the other end of the swing seat is provided with a groove for the push rod to contact and face the tail of the push rod.

In the above-mentioned presser foot lifting mechanism of a sewing machine, the push rod is in the shape of a slender rod, the upper end of the push rod is movably connected to the connecting hole of the swing crank, and the swing crank is fixedly installed with the machine head by an axial screw; the threaded hole at the other end of the swing crank is connected to the pull rod hole by an axial screw.

In the above-mentioned presser foot lifting mechanism of a sewing machine, the power source of the transmission shaft drives the presser foot lifting mechanism through a traditional knee rest device.

The beneficial effects of the present invention are:

The present invention uses the knee to drive the knee rest device as a driving source. The difference is that the power transmission adopts a gear transmission method to drive the presser foot lifting mechanism. The component assembly method is relatively simple, the driving structure of the presser foot lifting is simplified, and the production cost is reduced. The structure is very easy to install and easy to adjust. The physical output of the operator can be reduced through the gear output ratio, so that a small amount of force can achieve a big effect without idle travel, which reduces the operator's experience.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of the present invention;

Fig. 2 is an exploded view of the present invention;

FIG3 is an exploded view of a part of the structure of the present invention;

FIG. 4 is a perspective view of a partial structure of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to FIGS. 1 to 4 , the present invention provides a presser foot lifting mechanism for a sewing machine, which is characterized by comprising a mounting frame 1, a transmission shaft 2, a swing shaft 23, a swing seat 6, a torsion spring 7, a push rod 9, and a presser foot assembly 8;

The mounting frame 1 is fixedly installed at the bottom of the sewing machine base, the transmission shaft 2 is inserted into the mounting frame 1, the swing shaft 23 is connected to the base through the shaft sleeve 5, and a gear assembly forming a transmission connection is provided between the transmission shaft 2 and the swing shaft 23; the gear assembly includes a gear A3 and a gear B4, the gear A3 is fixedly installed at the middle of the transmission shaft 2, and the gear B4 is fixedly installed at one end of the swing shaft 23. The transmission shaft 2 and the swing shaft 23 are installed in a vertical relationship, and the gear A3 and the gear B4 are meshed with each other, thereby forming a transmission connection between the transmission shaft 2 and the swing shaft 23.

The swing seat 6 is fixedly installed on the swing shaft 23. The swing seat 6 is a U-shaped structure. The shaft hole at one end of the swing seat 6 is fixedly connected to the swing shaft 23 and fixed with screws. The torsion spring 7 is limited by a retaining spring and is installed at the end of the swing shaft 23. One end of the torsion spring 7 is limited at the bottom of the machine base and the other end is buckled on the swing seat 6 to play a resetting role.

The push rod 9 is in the shape of a slender rod, and a groove 601 is provided at the other end of the swing seat 6 for the push rod 9 to contact and face the tail of the push rod 9, so that the lower end of the push rod 9 is connected to the swing seat 6; the upper end of the push rod 9 is movably connected to the connecting hole 102 of the swing crank 10, and the swing crank 10 is fixedly installed with the machine head by the axial screw 21; the threaded hole 103 at the other end of the swing crank 10 is connected with the pull rod hole 111 by the axial screw 24, so that the upper end of the push rod 9 is linked to the presser foot assembly 8 through the swing crank 10 and the pull rod 11.

The power source of the transmission shaft 2 can be driven by a traditional knee rest device, or by a motor driving the transmission shaft 2 to drive the presser foot lifting mechanism; when the transmission shaft 2 drives the gear A3, it drives the gear B4 and then drives the swing shaft 23, the swing shaft 23 synchronously drives the swing seat 6, and the groove 601 of the swing seat 6 supports the push rod 9 to lift the push rod 9; the push rod 9 drives the swing crank 10, and under the action of the lever, the swing crank 10 drives the pull rod 11, and the pull rod 11 pulls up the presser foot assembly 8 to complete the presser foot lifting work.

The above is a detailed introduction to the presser foot lifting mechanism of a sewing machine provided by an embodiment of the present invention. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention. At the same time, for general technical users in this field, according to the idea of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

A presser foot lifting mechanism for a sewing machine, characterized in that it comprises a mounting frame (1), a transmission shaft (2), a swing shaft (23), a swing seat (6), a torsion spring (7), a push rod (9), and a presser foot assembly (8);

The mounting frame (1) is fixedly mounted on the bottom of the sewing machine base, the transmission shaft (2) is inserted into the mounting frame (1), the swing shaft (23) is connected to the base through a shaft sleeve (5), and a gear assembly is provided between the transmission shaft (2) and the swing shaft (23) to form a transmission connection; the swing seat (6) is fixedly mounted on the swing shaft (23), the torsion spring (7) is limitedly mounted on the end of the swing shaft (23) through a retaining spring, one end of the torsion spring (7) is limited at the bottom of the base, and the other end is buckled on the swing seat (6); the lower end of the push rod (9) is connected to the swing seat (6), and the upper end of the push rod (9) is linked to the presser foot assembly (8) through a swing crank (10) and a pull rod (11).
A presser foot lifting mechanism for a sewing machine according to claim 1, characterized in that: the gear assembly comprises a gear A (3) and a gear B (4), the gear A (3) is fixedly mounted on the middle part of the transmission shaft (2), and the gear B (4) is fixedly mounted on one end of the swing shaft (23).
The presser foot lifting mechanism of a sewing machine according to claim 2 is characterized in that the transmission shaft (2) and the swing shaft (23) are installed in a vertical relationship, and the gear A (3) and the gear B (4) are meshed with each other.
A presser foot lifting mechanism for a sewing machine according to claim 1, characterized in that: the swing seat (6) is a U-shaped structure, the axial hole at one end of the swing seat (6) is fixedly connected to the swing shaft (23) and fixed with screws, and the other end of the swing seat (6) is provided with a groove (601) for the push rod (9) to contact and face the tail of the push rod (9).
A presser foot lifting mechanism for a sewing machine according to claim 1 or 4, characterized in that: the push rod (9) is in the shape of a slender rod, the upper end of the push rod (9) is movably connected to the connecting hole (102) of the swing crank (10), and the swing crank (10) is fixedly mounted to the machine head by an axial screw (21); the threaded hole (103) at the other end of the swing crank (10) is connected to the pull rod hole (111) by an axial screw (24).
The presser foot lifting mechanism of a sewing machine according to claim 1 is characterized in that the power source of the transmission shaft (2) drives the presser foot lifting mechanism through a traditional knee support device.