Forward and backward sewing mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a forward and backward sewing mechanism of a sewing machine. The device comprises a main machine shell and an electric control machine shell, the electric control machine shell is arranged on one side of the main machine shell, a wrench shaft is inserted into the lower portion of one side of the main machine shell, the outer end of the wrench shaft is sleeved with the inner end of a backstitch wrench assembly, a shifting block is arranged at the outer end of the backstitch wrench assembly, and a Hall sensor is arranged below the middle of the backstitch wrench assembly. The lower portion of the Hall sensor is connected with the upper end of a torsion spring, the middle of the torsion spring is inserted into a winding nail, an induction magnet is arranged in the notch part and corresponds to the inner side of the Hall sensor, and a stepping motor and a transmission assembly are arranged in the electric control machine shell. Steering switching of the stepping motor is controlled according to the Hall sensing principle to achieve switching of backstitching and forward stitching, counter-acting force generated by mechanical hard connection is replaced, the structural design is beneficial to operation, action is light, fatigue in work is eliminated, and meanwhile the stepping motor controls the backstitching distance more accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a forward and backward sewing mechanism of a sewing machine. Background Art

[0002] The sewing action of a sewing machine utilizes a main power component to drive a transmission mechanism, which drives the upper and lower shafts of the sewing machine. The upper shaft drives the needle bar on the eccentric connecting rod device, converting it into the up and down movement of the needle and needle thread. The lower shaft also drives the lower hook through the transmission shaft to make a circular motion or left and right swing, so that the lower hook's bottom thread and the upper needle thread form a loop structure. At the same time, the feed mechanism is driven by a cam and eccentric connecting rod, causing it to produce intermittent motion. In this way, the needle sews up and down once, and the fabric is fed forward a certain length, which is a complete single stitch. Continuous and rapid action can achieve the purpose of sewing multiple layers of fabric. Existing reverse stitching mechanisms usually achieve the reverse stitching effect through mechanical hard connection transmission, and then use the tension of a spring to restore the original position. The disadvantage is that the process must overcome the force and reaction force generated by the mechanical hard connection, which causes fatigue after long-term and frequent use. Therefore, to address the above problems, a reverse stitching mechanism for a sewing machine is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a forward and backward sewing mechanism for a sewing machine in order to solve the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A reverse and forward stitching mechanism for a sewing machine comprises a main casing and an electronic control casing, wherein the electronic control casing is provided on one side of the main casing, a wrench shaft is inserted into the lower part of the other side of the main casing, and the outer end of the wrench shaft is sleeved with the lower part of one end of a reverse stitching wrench assembly, a Hall sensor is provided at the lower part of the middle of the reverse stitching wrench assembly, the upper end of a torsion spring is provided below the Hall sensor, and the lower end of the torsion spring is inserted into the side surface of the main casing, a winding pin is inserted in the middle part of the torsion spring, and one end of the winding pin is inserted into the lower part of the side surface of the main casing, an induction magnet is provided at the lower part of the side surface of the main casing, and the induction magnet corresponds to the Hall sensor, a stepping motor is provided in the lower part of the inner side of the electronic control casing, and the end of the stepping motor shaft is provided with the lower part of the transmission assembly, while the upper end of the transmission assembly passes through the main casing.

[0006] In the above-mentioned reverse and forward sewing mechanism of the sewing machine, a notch is opened at the lower side of one side of the main housing, and an induction magnet is fixedly connected to the upper part of the notch. A rotatable wrench shaft is inserted into one side of the main housing, and the outer end of the wrench shaft penetrates into the upper part of the notch, while the outer end port of the wrench shaft does not exceed the notch.

[0007] In the above-mentioned reverse and forward stitching mechanism of the sewing machine, the protruding end of the wrench shaft is sleeved and fixedly connected to one end of the reverse stitching wrench assembly, and the outer end of the reverse stitching wrench assembly is placed outside the main housing, and a toggle block is provided at the outer end of the reverse stitching wrench assembly.

[0008] In the above-mentioned reverse and forward stitching mechanism of the sewing machine, a Hall sensor is fixedly connected to the lower middle portion of the reverse stitching wrench assembly, and the Hall sensor is placed in the notch portion, and there is a distance between the inner side of the Hall sensor and the inner wall of the notch portion.

[0009] In the above-mentioned forward and reverse sewing mechanism of the sewing machine, the bottom of the Hall sensor is fixedly connected to the upper end of the torsion spring, and the lower end of the torsion spring is inserted into the lower side wall of the fixed connection notch.

[0010] In the above-mentioned reverse and forward sewing mechanism of the sewing machine, the middle part of the torsion spring is inserted into the middle part of the fixed connection winding pin, and the inner end of the winding pin is inserted into the inner wall of the fixed connection notch, and there is a distance between the winding pin and the Hall sensor.

[0011] In the above-mentioned forward and reverse sewing mechanism of the sewing machine, there is a gap between the inner side of the Hall sensor and the front side of the corresponding induction magnet, and the Hall sensor is electrically connected to the inside of the electronic control housing.

[0012] In the above-mentioned reverse and forward sewing mechanism of the sewing machine, the other side of the main housing is fixedly connected to one side of the electronic control housing, and the main housing is connected to the inside of the electronic control housing. A placement part is opened in the main housing, and a stepping motor is fixedly connected under the placement part.

[0013] In the above-mentioned reverse and forward sewing mechanism of the sewing machine, the stepping motor shaft is fixedly connected to the bottom of the transmission assembly, and the top of the transmission assembly is placed above the mounting part, and there is a gap between the middle of the transmission assembly and the side of the main housing.

[0014] In the above-mentioned reverse and forward sewing mechanism of the sewing machine, a through hole is opened on the upper part of the main housing, and the upper end of the transmission component passes through the through hole, and there is a gap between the outer wall of the upper end of the transmission component and the inner wall of the through hole.

[0015] Compared with the existing technology, the advantages of this utility model are:

[0016] The utility model is provided with an electric control casing on one side of the main casing, a wrench shaft is inserted into the lower part of the one side of the main casing, and the outer end of the wrench shaft is sleeved with the inner end of the reverse stitch wrench assembly, a toggle block is provided at the outer end of the reverse stitch wrench assembly, and a Hall sensor is provided at the lower middle part of the reverse stitch wrench assembly, the upper end of the torsion spring is connected below the Hall sensor, and a winding nail is inserted into the middle part of the torsion spring, an induction magnet is provided in the notch, and the induction magnet corresponds to the inner side of the Hall sensor, a stepping motor and a transmission assembly are provided in the electric control casing, and the Hall induction principle is used to control the steering switch of the stepping motor to achieve the switch between reverse stitching and forward stitching, thereby replacing the reaction force generated by the mechanical hard connection. The structural design is convenient for operation, the movement is light, and fatigue during work is eliminated. At the same time, the stepping motor controls the reverse stitch distance more accurately.

[0017] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall back of the utility model;

[0020] Figure 3 It is an overall exploded schematic diagram of the utility model;

[0021] Figure 4 This is a structural diagram of the reverse seam wrench of the utility model;

[0022] Figure 5 It is a schematic diagram of the internal structure of the electric control casing of the present utility model.

[0023] In the figure: 1. Main housing; 101. Through-hole portion; 102. Notch portion; 2. Electronic control housing; 201. Component placement portion; 3. Backstitch wrench assembly; 301. Toggle block; 4. Hall sensor; 5. Torsion spring; 6. Winding pin; 7. Induction magnet; 8. Wrench shaft; 9. Stepper motor; 10. Transmission assembly. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a reverse and forward sewing mechanism of a sewing machine includes a main casing 1 and an electronic control casing 2. The electronic control casing 2 is provided on one side of the main casing 1, and a wrench shaft 8 is inserted into the lower part of the other side of the main casing 1, and the outer end of the wrench shaft 8 is sleeved with the lower end of one end of the reverse sewing wrench assembly 3, and a Hall sensor 4 is provided at the lower middle part of the reverse sewing wrench assembly 3, and the upper end of the torsion spring 5 is provided below the Hall sensor 4, and the lower end of the torsion spring 5 is inserted into the side of the main casing 1, and a winding nail 6 is inserted in the middle of the torsion spring 5, and one end of the winding nail 6 is inserted into the lower side of the main casing 1, an induction magnet 7 is provided at the lower side of the main casing 1, and the induction magnet 7 corresponds to the Hall sensor 4, a stepping motor 9 is provided in the lower inner side of the electronic control casing 2, and the lower end of the transmission assembly 10 is provided at the rotating shaft end of the stepping motor 9, and the upper end of the transmission assembly 10 passes through the main casing 1.

[0026] A notch 102 is opened at the lower side of the main casing 1, and the induction magnet 7 is fixedly connected to the upper part of the notch 102. The rotatable wrench shaft 8 is inserted into one side of the main casing 1, and the outer end of the wrench shaft 8 penetrates into the upper part of the notch 102. At the same time, the outer end of the wrench shaft 8 does not exceed the notch 102.

[0027] Furthermore, the protruding end of the wrench shaft 8 is sleeved and fixedly connected to one end of the reverse seam wrench assembly 3, and the outer end of the reverse seam wrench assembly 3 is placed outside the main housing 1. At the same time, the outer end of the reverse seam wrench assembly 3 is provided with a toggle block 301.

[0028] After the wrench shaft 8 is inserted into the notch 102 at the lower side of the main casing 1, the outer end of the wrench shaft 8 is connected to one end of the reverse seam wrench assembly 3, so that the reverse seam wrench assembly 3 is linked with the wrench shaft 8. The toggle block 301 provided at the outer end of the reverse seam wrench assembly 3 is a prompt for the reverse seam action, and when the reverse seam action changes, the inclination angle of the toggle block 301 will also change accordingly.

[0029] Furthermore, a Hall sensor 4 is fixedly connected to the lower middle portion of the reverse seam wrench assembly 3 , and the Hall sensor 4 is placed in the notch 102 , and there is a distance between the inner side of the Hall sensor 4 and the inner wall of the notch 102 .

[0030] Furthermore, the bottom of the Hall sensor 4 is fixedly connected to the upper end of the torsion spring 5 , and the lower end of the torsion spring 5 is inserted into the lower side wall of the fixed connection notch 102 .

[0031] Furthermore, the middle of the torsion spring 5 is inserted into the middle of the fixed connection winding pin 6 , and the inner end of the winding pin 6 is inserted into the inner wall of the fixed connection notch 102 , and there is a distance between the winding pin 6 and the Hall sensor 4 .

[0032] Furthermore, there is a gap between the inner side of the Hall sensor 4 and the front side of the corresponding induction magnet 7 , and the Hall sensor 4 is electrically connected to the inside of the electronic control housing 2 .

[0033] The Hall sensor 4 and the torsion spring 5 provided at the lower middle part of the reverse stitch wrench assembly 3 drive the reverse stitching operation of the reverse stitch wrench assembly 3. Since the inner side of the Hall sensor 4 corresponds to the induction magnet 7, when the tilt angle of the toggle block 301 above the reverse stitch wrench assembly 3 is changed, the Hall sensor 4 will correspond to or not correspond to the induction magnet 7, thereby forming two directions of rotation of the stepping motor 9, thereby achieving the reverse stitching action of the sewing machine.

[0034] The other side of the main housing 1 is fixedly connected to one side of the electronic control housing 2, and the main housing 1 is connected to the electronic control housing 2. A mounting portion 201 is provided in the main housing 1, and a stepping motor 9 is fixedly connected to the lower portion of the mounting portion 201.

[0035] Furthermore, the rotating shaft of the stepping motor 9 is fixedly connected to the bottom of the transmission assembly 10 , and the top of the transmission assembly 10 is placed above the mounting portion 201 , and there is a gap between the middle of the transmission assembly 10 and the side of the main housing 1 .

[0036] The stepping motor 9 provided in the electric control housing 2 drives the entire structure when started, and drives the transmission assembly 10 to operate the sewing machine.

[0037] Furthermore, a through hole portion 101 is opened in the upper part of the main housing 1 , and the upper end of the transmission component 10 passes through the through hole portion 101 , and there is a gap between the outer wall of the upper end of the transmission component 10 and the inner wall of the through hole portion 101 .

[0038] The stepper motor 9 provided in the electronic control housing 2 is indirectly connected to the Hall sensor 4 through the electronic control housing 2. While the stepper motor 9 is controlled by the Hall sensor 4, the stepper motor 9 controls the transmission component 10 and controls the direction of the transmission component 10.

[0039] Working principle:

[0040] An electric control housing 2 is provided on one side of the main housing 1, so that the main housing 1 and the electric control housing 2 form an integral whole, and the two are internally connected, a wrench shaft 8 is inserted into the lower part of one side of the main housing 1, and the outer end of the wrench shaft 8 is placed in the notch 102, and the inner end of the reverse seam wrench assembly 3 is sleeved on the outer end of the wrench shaft 8, so that the reverse seam wrench assembly 3 and the wrench shaft 8 are linked, and the wrench shaft 8 supports the rotation of the reverse seam wrench assembly 3, and a toggle block 301 is provided at the outer end of the reverse seam wrench assembly 3, and the toggle block 301 can be used to toggle the reverse seam wrench assembly 3 and the wrench shaft 8 for reverse seaming. A Hall sensor 4 is provided at the lower middle part of the reverse seam wrench assembly 3, and the upper end of the torsion spring 5 is connected to the lower middle part of the Hall sensor 4. At the same time, the torsion spring 5 is inserted into the side of the main housing 1 at the lower part, and a winding nail 6 is inserted into the middle part of the torsion spring 5 to support the torsion spring 5. In this way, the torsion spring 5 works when the Hall sensor 4 and the reverse seam wrench assembly 3 are working. , so that the two will restore their original positions. An induction magnet 7 is provided in the notch 102, and the induction magnet 7 corresponds to the inside of the Hall sensor 4, and the Hall sensor 4 is electrically connected to the electronic control housing 2, and a stepping motor 9 and a transmission assembly 10 are provided in the electronic control housing 2. In this way, the Hall sensor 4 indirectly controls the rotation of the stepping motor 9 and controls the rotation direction of the transmission assembly 10. During work, when the toggle block 301 of the reverse sewing wrench assembly 3 is pressed, the inside of the Hall sensor 4 will leave the corresponding front of the induction magnet 7. At this time, the stepping motor 9 changes direction, thereby achieving the reverse sewing action of the sewing machine, and releasing the toggle block 301 above the reverse sewing wrench assembly 3. Under the action of the torsion spring 5, the reverse sewing wrench assembly 3 and the Hall sensor 4 return to their original positions, and the Hall sensor 4 corresponds to the induction magnet 7, so that the sewing machine resumes normal forward sewing operation.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0042] Although this document frequently uses terms such as 1. main housing; 101. through-hole portion; 102. notch portion; 2. electric control housing; 201. component placement portion; 3. reverse-stitch wrench assembly; 301. toggle block; 4. Hall sensor; 5. torsion spring; 6. winding pin; 7. induction magnet; 8. wrench shaft; 9. stepping motor; and 10. transmission assembly, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitation would be contrary to the spirit of the present invention.

Claims

1. A forward and backward sewing mechanism for a sewing machine, comprising a main housing (1) and an electric control housing (2), characterized in that: The main housing (1) is provided with an electric control housing (2) on one side, and a wrench shaft (8) is inserted into the lower part of the other side of the main housing (1), and the outer end of the wrench shaft (8) is sleeved with the lower part of one end of the reverse seam wrench assembly (3). A Hall sensor (4) is provided at the lower part of the middle of the reverse seam wrench assembly (3), and the upper end of the torsion spring (5) is provided below the Hall sensor (4), and the lower end of the torsion spring (5) is inserted into the side of the main housing (1). A winding nail (6) is inserted in the middle of the torsion spring (5), and one end of the winding nail (6) is inserted into the lower part of the side of the main housing (1). An induction magnet (7) is provided at the lower part of the side of the main housing (1), and the induction magnet (7) corresponds to the Hall sensor (4). A stepping motor (9) is provided inside the lower part of the inner side of the electric control housing (2), and the rotating shaft end of the stepping motor (9) is provided with the lower part of the transmission assembly (10), and at the same time, the upper end of the transmission assembly (10) passes through the main housing (1).

2. The reverse and forward sewing mechanism of a sewing machine according to claim 1, characterized in that: A notch portion (102) is provided at the lower portion of one side of the main housing (1), and an induction magnet (7) is fixedly connected to the upper portion of the notch portion (102). A rotatably connected wrench shaft (8) is inserted into one side of the main housing (1), and the outer end of the wrench shaft (8) penetrates into the upper portion of the notch portion (102), while the outer end of the wrench shaft (8) does not exceed the notch portion (102).

3. The reverse and forward sewing mechanism of a sewing machine according to claim 2, characterized in that: The protruding end of the wrench shaft (8) is sleeved and fixedly connected to one end of the reverse seam wrench assembly (3), and the outer end of the reverse seam wrench assembly (3) is placed outside the main housing (1). At the same time, the outer end of the reverse seam wrench assembly (3) is provided with a toggle block (301).

4. The reverse and forward sewing mechanism of a sewing machine according to claim 3, characterized in that: A Hall sensor (4) is fixedly connected to the lower middle portion of the reverse seam wrench assembly (3), and the Hall sensor (4) is placed in the notch portion (102), while a distance exists between the inner side of the Hall sensor (4) and the inner wall of the notch portion (102).

5. The reverse and forward sewing mechanism of a sewing machine according to claim 4, characterized in that: The bottom of the Hall sensor (4) is fixedly connected to the upper end of the torsion spring (5), and the lower part of the torsion spring (5) is inserted into the lower side wall of the fixed connection notch (102).

6. The reverse and forward sewing mechanism of a sewing machine according to claim 5, characterized in that: The middle of the torsion spring (5) is inserted into the middle of the fixed connection winding pin (6), and the inner end of the winding pin (6) is inserted into the inner wall of the fixed connection notch (102), and there is a distance between the winding pin (6) and the Hall sensor (4).

7. The reverse and forward sewing mechanism of a sewing machine according to claim 6, characterized in that: There is a gap between the inner side of the Hall sensor (4) and the front side of the corresponding induction magnet (7), and the Hall sensor (4) is electrically connected to the inside of the electric control housing (2).

8. The reverse and forward sewing mechanism of a sewing machine according to claim 1, characterized in that: The other side of the main housing (1) is fixedly connected to one side of the electric control housing (2), and the main housing (1) is connected to the inside of the electric control housing (2). A mounting portion (201) is provided in the main housing (1), and a stepping motor (9) is fixedly connected below the mounting portion (201).

9. The reverse and forward sewing mechanism of a sewing machine according to claim 8, characterized in that: The rotating shaft of the stepping motor (9) is fixedly connected to the bottom of the transmission assembly (10), and the top of the transmission assembly (10) is placed above the mounting portion (201), and there is a gap between the middle of the transmission assembly (10) and the side of the main housing (1).

10. The reverse and forward sewing mechanism of a sewing machine according to claim 9, characterized in that: A through hole portion (101) is provided on the upper portion of the main housing (1), and the upper end of the transmission component (10) passes through the through hole portion (101), and a gap is provided between the outer wall of the upper end of the transmission component (10) and the inner wall of the through hole portion (101).

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