Presser foot lifting device of button sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a presser foot lifting device of a button sewing machine. The presser foot lifting main shaft is arranged in the button sewing machine rack; the first swing arm is connected to one end of the presser foot lifting main shaft; the lifting and pressing connecting rod is rotationally connected with the first swing arm; one end of the second swing arm is rotationally connected to the lifting and pressing connecting rod, and the other end of the second swing arm is rotationally connected to the button sewing machine rack; the stepping motor drives a cam, and the cam abuts against one side of the second swing arm and is used for driving the second swing arm to move through swing of the cam so as to sequentially drive the lifting and pressing connecting rod, the first swing arm and the lifting and pressing foot main shaft to move; and the reset piece is connected to the second swing arm and used for driving the second swing arm to move in the direction opposite to the movement direction of the cam.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, and particularly refers to a presser foot lifting device for a button sewing machine. Background Art

[0002] A button sewing machine belongs to a special sewing machine, and its technology is relatively mature; the traditional presser foot lifting mechanism of a button sewing machine is driven by manpower, which increases the working intensity of workers. Moreover, frequent lifting and lowering of the presser foot for a long time will also cause physical soreness and a decrease in work efficiency.

[0003] For example, a presser foot lifting mechanism of a button sewing machine disclosed in Chinese Utility Model No. 202022249873X includes a button sewing machine housing. A presser foot main shaft is horizontally arranged in the button sewing machine housing. A presser foot assembly is arranged at the front end of the button sewing machine housing, and the presser foot assembly is located below the presser foot main shaft. A linkage structure is arranged between the presser foot main shaft and the presser foot assembly to lift or lower the presser foot assembly as the presser foot main shaft rotates.

[0004] In the presser foot lifting mechanism of this button sewing machine, since the stepping motor directly drives the active swing arm to swing, and sequentially drives the transmission connecting rod and the driven swing arm through the active swing arm, the load on the stepping motor is large, which affects its service life. Summary of the Invention

[0005] The purpose of the utility model is to provide a presser foot lifting device for a button sewing machine that can effectively reduce the load on the stepping motor.

[0006] The purpose of the utility model is achieved as follows:

[0007] A presser foot lifting device for a button sewing machine includes:

[0008] A button sewing machine frame;

[0009] A presser foot main shaft arranged in the button sewing machine frame;

[0010] A first swing arm connected to one end of the presser foot main shaft;

[0011] A presser foot connecting rod rotatably connected to the first swing arm;

[0012] A second swing arm, one end of the second swing arm is rotatably connected to the presser foot connecting rod, and the other end of the second swing arm is rotatably connected to the button sewing machine frame;

[0013] A stepping motor, the stepping motor drives a cam, and the cam abuts against one side of the second swing arm, and is used to drive the second swing arm to move through the swing of the cam, so as to sequentially drive the presser foot connecting rod, the first swing arm, and the presser foot main shaft to move;

[0014] And

[0015] A reset member, which is connected to the second swing arm and is used to drive the second swing arm to move in the opposite direction of the movement of the cam.

[0016] Furthermore, a receiving groove is formed on one side of the second swing arm, and the cam abuts against the receiving groove to drive the second swing arm to move.

[0017] Furthermore, an installation plate is further provided on one side of the button sewing machine frame, and the stepping motor is fixed in the installation plate.

[0018] Furthermore, a plurality of connecting bosses are provided on the installation plate, and connecting holes are formed in the connecting bosses. The button sewing machine frame and the installation plate are connected by arranging fasteners connected to the button sewing machine frame in the connecting holes.

[0019] Furthermore, the cam and the connecting boss are respectively arranged on both sides of the second swing arm, and a positioning groove opposite to the connecting boss is further provided on the second swing arm, so that when the cam pushes the second swing arm to move, the connecting boss is placed in the positioning groove.

[0020] Furthermore, there are two connecting bosses, which are arranged up and down on the installation plate respectively and are connected to the button sewing machine frame.

[0021] Furthermore, the lifting and pressing connecting rod includes two joints respectively connected to the first swing arm and the second swing arm. Threaded holes are formed in the joints, and a threaded shaft is connected between the two joints.

[0022] The prominent and beneficial technical effects of the present utility model compared with the prior art are:

[0023] In this patent, since the cam abuts against one side of the second swing arm, the cam and the second swing arm form a lever. Compared with directly driving the first swing arm to work by a motor, the cam abutting structure in this patent can effectively reduce the load during the operation of the motor, thereby increasing the service life of the motor. Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of the lifting and pressing foot device.

[0025] Figure 2 It is a structural schematic diagram on the installation plate.

[0026] The meanings represented by the reference numerals in the drawings:

[0027] 1. Button sewing machine frame; 11. Connecting boss; 111. Connecting hole; 2. Lifting and pressing foot main shaft; 3. First swing arm; 4. Lifting and pressing connecting rod; 41. Joint; 42. Threaded shaft; 5. Second swing arm; 51. Receiving groove; 52. Positioning groove; 6. Stepping motor; 61. Cam; 7. Reset member; 8. Installation plate; 81. Spindle motor; Detailed implementation mode

[0028] The present utility model will be further described below in conjunction with specific embodiments:

[0029] A presser foot lifting device for a button sewing machine, comprising a button sewing machine frame 1, a presser foot lifting main shaft 2, a first swing arm 3, a presser foot lifting connecting rod 4, a second swing arm 5, a stepping motor 6 and a resetting member 7; As Figure 1 、 2 shown, the button sewing machine frame 1 is used to install the main shaft of the button sewing machine and the presser foot lifting main shaft 2 described in this patent. The presser foot lifting main shaft 2 is rotatably arranged in the button sewing machine frame 1. A presser foot of the button sewing machine is provided at one end of the presser foot lifting main shaft 2, and the rotation of the presser foot lifting main shaft 2 is used to drive the presser foot to lift and lower.

[0030] Combined with Figure 1 、 2 shown, the other end of the presser foot lifting main shaft 2 is located outside the button sewing machine frame 1. The first swing arm 3 is fixedly connected to the other end of the presser foot lifting main shaft 2 through a clamp structure. The presser foot lifting connecting rod 4 is rotatably connected to the first swing arm 3. The second swing arm 5 is arranged below the presser foot lifting connecting rod 4. One end of the second swing arm 5 is rotatably connected to the presser foot lifting connecting rod 4, and the other end of the second swing arm 5 is rotatably connected to the button sewing machine frame 1; The stepping motor 6 drives a cam 61, and the cam 61 abuts against one side of the second swing arm 5, and is used to drive the second swing arm 5 to move through the swing of the cam 61, so as to drive the presser foot lifting connecting rod 4, the first swing arm 3 and the presser foot lifting main shaft 2 to move in sequence; The resetting member 7 is specifically a spring fixed on the second swing arm 5. One end of the spring is hooked on the second swing arm 5, and the other end of the spring is hung on a positioning pin fixed on the button sewing machine frame 1.

[0031] Specifically as Figure 2 shown, actually, an installation plate 8 is also fixed beside the button sewing machine. A stepping motor 6 and a main shaft motor 81 for driving the main shaft of the button sewing machine to work are provided on the installation plate 8. The main shaft motor 81 drives the main shaft of the button sewing machine to work, drives the button sewing machine to perform button sewing work. The output shaft of the stepping motor 6 passes through the installation plate 8, and the cam 61 is fixed on its output shaft. The cam 61 is located above the second swing arm 5 and abuts downward. By driving the cam 61 to rotate, the cam 61 relatively presses against the second swing arm 5 to move. The second swing arm 5 pulls the first swing arm 3 downward, and drives the presser foot lifting main shaft 2 to rotate through the rotation of the first swing arm 3, so as to realize lifting and lowering of the presser foot. When the stepping motor 6 resets, the second swing arm 5 is reset under the action of the resetting member 7 to restore the presser foot.

[0032] Since the cam 61 abuts against one side of the second swing arm 5, the cam 61 and the second swing arm 5 form a lever structure. Compared with directly driving the first swing arm 3 to work by a stepper motor, the cam 61 abutting structure in this patent can effectively reduce the load during the operation of the stepper motor, thereby increasing the service life of the stepper motor.

[0033] Further, a receiving groove 51 is formed in the second swing arm 5, and the cam 61 abuts against the receiving groove 51 to drive the second swing arm 5 to move. The receiving groove 51 is trapezoidal. When the cam 61 abuts against the receiving groove 51, the cam 61 will abut against the side wall of the receiving groove 51, thereby increasing the contact area between the cam 61 and the receiving groove 51, so as to facilitate the cam 61 to drive the second swing arm 5 to work.

[0034] Further, a plurality of connecting bosses 11 are provided on the mounting plate 8, and connecting holes 111 are provided in the connecting bosses 11. The button sewing machine frame 1 and the mounting plate 8 are connected by arranging fasteners connected to the button sewing machine frame 1 in the connecting holes 111. As Figure 2 shown, there are two connecting bosses 11 in this patent, which are respectively arranged above and below the second swing arm 5. The connecting holes 111 are threaded holes. The mounting plate 8 is fixed on the button sewing machine frame 1 by arranging screws in the connecting holes 111 to achieve fixation; the upper and lower distribution of the plurality of connecting bosses 11 can increase the stability after the two are connected.

[0035] Further, a positioning groove 52 opposite to the connecting boss 11 is also provided on the second swing arm 5, which is used to place the connecting boss 11 in the positioning groove 52 when the cam 61 pushes the second swing arm 5 to move. The maximum swing distance of the second swing arm 5 is limited by the connecting boss 11, and at the same time, by embedding the connecting boss 11 into the positioning groove 52, when the second swing arm 5 is laterally stressed, it can buffer and reduce the looseness and detachment of the rotation connection point between the second swing arm and the button sewing machine frame 1.

[0036] Further, the lifting and pressing connecting rod 4 includes two joints 41 respectively connected to the first swing arm 3 and the second swing arm 5. Threaded holes are provided in the joints 41, and a threaded shaft 42 is connected between the two joints 41. One end of the joint 41 is provided with a round head connected to the second swing arm 5 or the first swing arm 3. The length of the adjustable pressure regulating connecting rod can be adjusted by using the threaded shaft 42 and the threaded hole, so as to adjust the swing amplitude of the first swing arm 3 and affect the amplitude of the lifting and pressing foot.

[0037] The above embodiments are only preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A presser foot lifting device for a button sewing machine, characterized in that: include: Button sewing machine frame (1); A presser foot lifting spindle (2) is arranged in the button sewing machine frame (1); A first swing arm (3) connected to one end of the presser foot lifting spindle (2); A lifting and pressing connecting rod (4) rotatably connected to the first swing arm (3); A second swing arm (5), one end of the second swing arm (5) is rotatably connected to the lifting and pressing connecting rod (4), and the other end of the second swing arm (5) is rotatably connected to the button sewing machine frame (1); A stepper motor (6), the stepper motor (6) drives a cam (61), the cam (61) abuts against one side of the second swing arm (5), and is used to drive the second swing arm (5) to move through the swing of the cam (61), thereby driving the lifting and pressing connecting rod (4), the first swing arm (3), and the lifting and pressing foot spindle (2) to move in sequence; as well as The reset member (7) is connected to the second swing arm (5) and is used to drive the second swing arm (5) to move in the opposite direction to the movement of the cam (61).

2. The presser foot lifting device of a button sewing machine according to claim 1, characterized in that: A receiving groove (51) is provided on one side of the second swing arm (5), and the cam (61) abuts against the receiving groove (51) to drive the second swing arm (5) to move.

3. The presser foot lifting device of a button sewing machine according to claim 1, characterized in that: A mounting plate (8) is also provided on one side of the button sewing machine frame (1), and the stepping motor (6) is fixed in the mounting plate (8).

4. The presser foot lifting device of a button sewing machine according to claim 3, characterized in that: The mounting plate (8) is provided with a plurality of connecting bosses (11), and connecting holes (111) are provided in the connecting bosses (11). The button sewing machine frame (1) and the mounting plate (8) are connected by arranging fasteners connected to the button sewing machine frame (1) in the connecting holes (111).

5. The presser foot lifting device of a button sewing machine according to claim 4, characterized in that: The cam (61) and the connecting boss (11) are respectively provided on both sides of the second swing arm (5); the second swing arm (5) is also provided with a positioning groove (52) opposite to the connecting boss (11) so as to place the connecting boss (11) in the positioning groove (52) when the cam (61) pushes the second swing arm (5) to move.

6. The presser foot lifting device of a button sewing machine according to claim 4, characterized in that: The connecting bosses (11) are provided with two, which are respectively arranged on the mounting plate (8) one above the other and connected to the button sewing machine frame (1).

7. The presser foot lifting device of a button sewing machine according to claim 1, characterized in that: The lifting and pressing connecting rod (4) comprises two joints (41) respectively connected to the first swing arm (3) and the second swing arm (5); a threaded hole is provided in the joint (41); and a threaded shaft (42) is connected between the two joints (41).

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