Backstitch electronic switch for sewing machine

Abstract

The technical scheme belongs to the technical field of sewing machines, and particularly relates to a backstitch electronic switch for a sewing machine, which comprises a mounting seat, an electronic switch and an electronic switch, the switch piece is hinged to the mounting seat, and the end side of the switch piece is provided with a trigger part; the circuit board assembly is provided with an inductor and is arranged on the mounting seat; a sensor is arranged on the circuit board assembly corresponding to the motion path of the trigger part; the switch piece is pressed to rotate, so that the trigger part triggers the sensor, and the sewing machine performs backstitch operation; a hinge column is convexly arranged on the mounting seat, and a hinge hole is formed in the switch piece; when the switch piece is installed on the installation base, the hinge column is located in the hinge hole. A fixing bolt is in threaded connection with the hinge column and is used for fixing the switch piece on the hinge column; the backstitch electronic switch further comprises a reset spring which is used for enabling the trigger part to always have the movement trend away from the inductor. The two ends of the reset spring are connected to the installation base and the switch piece respectively.

Description

Technical Field

[0001] The technical solution relates to the technical field of sewing machines, and in particular to an electronic reverse stitch switch for sewing machines. Background Art

[0002] There are generally two types of reverse stitching mechanisms on sewing machines. One is to manually drive the reverse stitching mechanism to achieve reverse stitching through a reverse stitching wrench, and the other is to drive the reverse stitching mechanism to achieve reverse stitching through an electromagnet.

[0003] Chinese patent CN204959246U discloses a reverse stitch structure of a sewing machine. The iron core of the electromagnet of this reverse stitch structure is connected to the eccentric column on the transmission shaft through a joint. The iron core of the electromagnet is pulled down to drive the transmission shaft to rotate and thus realize the automatic reverse stitching action. This structure requires a large force to drive. Therefore, the driving force requirements of the electromagnet are relatively high, which greatly increases the cost of use. At the same time, this reverse stitch structure is complicated and the installation process is cumbersome. Summary of the invention

[0004] The purpose of this technical solution is to provide an electronic reverse stitch switch for a sewing machine. By manually toggling the switch, the trigger part triggers the sensor, and the reverse stitching of the sewing machine is controlled by the circuit board assembly, thereby solving the problem of cumbersome and high cost of the reverse stitching process of the sewing mechanism driven by an electromagnet.

[0005] The purpose of this technical solution is achieved in this way:

[0006] A reverse stitch electronic switch for a sewing machine comprises: a mounting seat, which is used to be mounted on the sewing machine; a switch member, which is hinged on the mounting seat, and the end side of the switch member has a trigger portion; and a circuit board assembly, which has a sensor and is arranged on the mounting seat; wherein the circuit board assembly corresponding to the movement path of the trigger portion is provided with a sensor; the switch member is pressed to rotate, so that the trigger portion triggers the sensor, and the sewing machine performs a reverse stitch operation.

[0007] Preferably, a hinge column is protruding from the mounting seat, and a hinge hole is formed in the switch component; when the switch component is mounted on the mounting seat, the hinge column is located in the hinge hole.

[0008] Preferably, a fixing bolt is threadedly connected to the hinge column for fixing the switch member on the hinge column.

[0009] Preferably, the reverse stitch electronic switch further comprises a reset spring, which is used to ensure that the trigger part always has a movement tendency away from the sensor; the two ends of the reset spring are respectively connected to the mounting seat and the switch member.

[0010] Preferably, a first threaded pin is provided on the mounting seat, and a second threaded pin is provided on the switch member; and both ends of the reset spring are hung on the first threaded pin and the second threaded pin respectively.

[0011] Preferably, the switch member comprises a pressing portion, an active arm and a passive arm; the trigger portion is arranged on the passive arm; the active arm and the passive arm are located around the hinge hole; and a pressing groove is formed in a depression on the pressing portion.

[0012] Preferably, the slave arm movably abuts against threaded pin one.

[0013] Preferably, a limit pin is provided on the mounting seat; and the driven arm movably abuts against the limit pin.

[0014] Preferably, a second limit pin is provided on the mounting seat; and the active arm movably abuts against the second limit pin.

[0015] Compared with the prior art, the technical solution has the following outstanding and beneficial technical effects:

[0016] 1. The trigger part and sensor designed in this technical solution have simple structures and quick responses. The circuit board assembly directly controls the reverse stitching mechanism of the sewing machine. By manually toggling the switch, the forward stitching and reverse stitching of the sewing machine can be directly switched.

[0017] 2. The reset spring designed in this technical solution can ensure that the switch does not trigger the sensor when there is no force, and can ensure that the electronic switch will not reverse due to accidental touch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the technical solution.

[0019] Figure 2 It is the front view of this technical solution.

[0020] Figure 3 This is an exploded diagram of this technical solution.

[0021] Figure numerals: 1. mounting base; 2. switch member; 3. triggering part; 4. circuit board assembly; 5. sensor; 6. hinge column; 7. hinge hole; 8. fixing bolt; 9. reset spring; 10. threaded pin one; 11. threaded pin two; 12. pressing part; 13. active arm; 14. driven arm; 15. pressing groove; 16. limit pin one; 17. limit pin two. DETAILED DESCRIPTION

[0022] The specific implementation of the technical solution is further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 and Figure 2As shown, a reverse stitch electronic switch for a sewing machine is arranged on the sewing machine, and the sewing machine is controlled to perform reverse stitching by toggling a switch element 2. The reverse stitch electronic switch has the advantages of simple structure and faster response than the structure of electromagnet control or mechanical control. The reverse stitch electronic switch mainly comprises a mounting seat 1, a switch element 2 and a circuit board assembly 4. The mounting seat 1 has a plurality of mounting holes, and mounting screws are inserted into the mounting holes, and the mounting seat 1 is mounted on the sewing machine; the switch element 2 is movably hinged on the mounting seat 1, and a trigger part 3 is arranged at the front end of the mounting seat 1, and the toggling switch element 2 can drive the trigger part 3 to follow the movement; the circuit board assembly 4 is fixedly arranged on the mounting seat 1, and has a sensor 5 matched with the trigger part 3, and the sensor 5 is arranged on the circuit board assembly 4 corresponding to the movement path of the trigger part 3. When the switch element 2 is pressed to make the trigger part 3 move to the front of the sensor 5, the sensor 5 detects the trigger part 3, and the sewing machine performs reverse stitching.

[0024] like Figure 1 and Figure 2 As shown, a hinge column 6 is protruded from the mounting base 1, a screw hole is opened in the middle of the hinge column 6, and a hinge hole 7 is opened on the switch member 2. The switch member 2 can be installed on the hinge column 6 through the hinge hole 7 to realize the hinge of the switch member 2.

[0025] Furthermore, a fixing bolt 8 is threadedly connected to the hinge column 6 , and the fixing bolt 8 is threadedly connected in the screw hole for fixing the switch component 2 on the hinge column 6 . When the switch component 2 is installed on the hinge column 6 , the fixing bolt 8 abuts against the end face of the switch component 2 .

[0026] like Figure 1 and Figure 2 As shown, the reverse stitch electronic switch also includes a reset spring 9, which is arranged on the inner side of the sensor 5. The two ends of the reset spring 9 are respectively connected to the mounting base 1 and the switch member 2, so that the trigger part 3 always has a movement tendency away from the sensor 5, which can effectively avoid accidentally touching the switch member 2 and causing the sewing machine to reverse stitch.

[0027] Furthermore, a threaded pin 10 is provided on the mounting seat 1, a threaded pin 2 11 is provided on the switch member 2, and both ends of the reset spring 9 are hung on the threaded pin 10 and the threaded pin 2 11 respectively. Such a structure can quickly install the reset spring 9.

[0028] like Figure 1 and Figure 2As shown, the switch member 2 includes a pressing portion 12, an active arm 13 and a driven arm 14, the active arm 13 and the driven arm 14 are located on the side of the hinge hole 7 and have a certain angle, and the length of the active arm 13 is greater than that of the driven arm 14, the pressing portion 12 is connected to the other end of the active arm 13 and is perpendicular to the active arm 13, and the trigger portion 3 is arranged on the driven arm 14. When the electronic switch is installed on the side of the sewing machine, the pressing portion 12 can be ensured to be located directly in front of the personnel, so that the personnel can perform the pressing operation conveniently, and through the cooperation of the active arm 13 and the driven arm 14, the effect of labor-saving pressing can be achieved, and a pressing groove 15 is formed on the pressing portion 12 to facilitate the personnel to press with their hands.

[0029] Furthermore, the setting of the threaded pin 10 can limit the maximum movement distance of the switch member 2. When the switch member 2 is toggled, the follower arm 14 is against the threaded pin 10 at its maximum toggling distance, which can effectively prevent the switch member 2 from being over-moved and protect the electronic switch from damage.

[0030] like Figure 1 and Figure 2 As shown, a limit pin 16 and a limit pin 2 17 are provided on the mounting seat 1, the active arm 13 movably abuts against the limit pin 16, and the driven arm 14 movably abuts against the limit pin 2 17. The limit pin 16 is used to limit the maximum pressing distance of the switch member 2, and the limit pin 2 17 is used to limit the maximum moving distance of the switch member 2 driven by the reset spring 9, which can ensure that the switch member 2 will not be excessively pressed, and can also ensure that the sewing machine will not reverse stitch due to accidental touching of the switch member 2.

[0031] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0032] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0033] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0034] The above shows and describes the basic principle and main features of the technical solution and the advantages of the technical solution. The technicians in this industry should understand that the technical solution is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the technical solution. Without departing from the spirit and scope of the technical solution, the technical solution will have various changes and improvements, which fall within the scope of the technical solution to be protected. The scope of protection claimed by the technical solution is defined by the attached claims and their equivalents.

Claims

1. An electronic reverse stitch switch for a sewing machine, characterized in that: include: A mounting base (1) for mounting on a sewing machine; A switch member (2) is hingedly connected to the mounting seat (1), and the end side of the switch member (2) has a trigger portion (3); and A circuit board assembly (4) having an inductor (5) and arranged on the mounting base (1); Wherein, a sensor (5) is provided on the circuit board component (4) corresponding to the movement path of the trigger part (3); The switch element (2) is pressed to rotate, thereby enabling the triggering part (3) to trigger the sensor (5), and the sewing machine performs a reverse stitching operation.

2. The reverse stitch electronic switch for a sewing machine according to claim 1, characterized in that: The mounting seat (1) is provided with a hinge column (6) protruding therefrom, and the switch member (2) is provided with a hinge hole (7); When the switch member (2) is mounted on the mounting seat (1), the hinge column (6) is located in the hinge hole (7).

3. The reverse stitch electronic switch for a sewing machine according to claim 2, characterized in that: The hinge column (6) is threadedly connected with a fixing bolt (8) for fixing the switch element (2) on the hinge column (6).

4. The reverse stitch electronic switch for a sewing machine according to claim 3, characterized in that: It also includes a return spring (9) for ensuring that the triggering portion (3) always has a tendency to move away from the sensor (5); The two ends of the return spring (9) are respectively connected to the mounting seat (1) and the switch member (2).

5. The reverse stitch electronic switch for a sewing machine according to claim 4, characterized in that: The mounting seat (1) is provided with a first threaded pin (10), and the switch element (2) is provided with a second threaded pin (11); The two ends of the return spring (9) are respectively hung on the first threaded pin (10) and the second threaded pin (11).

6. The reverse stitch electronic switch for a sewing machine according to claim 5, characterized in that: The switch member (2) comprises a pressing portion (12), an active arm (13) and a passive arm (14); The triggering part (3) is arranged on the driven arm (14); The active arm (13) and the driven arm (14) are located around the hinge hole (7); The pressing portion (12) is recessed to form a pressing groove (15).

7. The reverse stitch electronic switch for a sewing machine according to claim 6, characterized in that: The driven arm (14) movably abuts against the threaded pin 1 (10).

8. The reverse stitch electronic switch for a sewing machine according to claim 6, characterized in that: A limiting pin (16) is provided on the mounting seat (1); The driven arm (14) movably abuts against a limiting pin (16).

9. The reverse stitch electronic switch for a sewing machine according to claim 6, characterized in that: The mounting seat (1) is provided with a second limit pin (17); The active arm (13) movably abuts against the second limiting pin (17).

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