Electronic backstitch wrench mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to an electronic backstitch wrench mechanism of a sewing machine. An induction support is arranged on the machine shell and comprises a support body and a shaft sleeve, the support body is fixedly arranged on the machine shell, a backstitch wrench shaft is sleeved with the shaft sleeve, relative displacement can be generated between the backstitch wrench and the induction support, an induction Hall plate is arranged on the support body, and induction magnetic steel is arranged on the backstitch wrench. The sensing Hall plate and the sensing magnetic steel are oppositely arranged and are paired for sensing, the sensing Hall plate is electrically connected with a controller for controlling the stitch length adjusting motor to act, and the backstitch wrench is driven by a reset mechanism to reset; the sensing Hall plate arranged on the sensing support senses changes of magnetic induction lines generated by rotation of the sensing magnetic steel arranged on the backstitch wrench, detected signals are sent to the controller, backstitch or close stitching is achieved under the cooperation of the controller and the stitch length adjusting motor, the structure is compact, and installation is convenient.

Description

Technical field:

[0001] The utility model belongs to the technical field of sewing machines, in particular to an electronic backstitch wrench mechanism of a sewing machine. Background technology:

[0002] Sewing machines are the most commonly used sewing devices, and most of them are driven by controllers and motors. When a sewing machine starts sewing or accepts sewing, it is generally necessary to perform reverse stitching or dense stitching to ensure the firmness of the sewing thread. Chinese utility model patent (Announcement No. CN 220034861U, application date 2023.06.21, announcement date 2023.11.17) discloses an electronic wrench for stitch length adjustment, which includes an adjustment seat, an adjustment shaft is rotatably arranged in the adjustment seat, an adjustment crank located in the adjustment seat is fixed at one end of the adjustment shaft, a wrench is fixed at the other end of the adjustment shaft extending out of the adjustment seat, and a reset mechanism is arranged between the adjustment crank and the adjustment seat, and a displacement sensor for detecting the position of the adjustment crank is arranged in the adjustment seat, and the displacement sensor is electrically connected to the controller of the stitch length adjustment motor. The above-mentioned structure has many parts and has defects such as complex structure and cumbersome assembly. Summary of the invention:

[0003] The utility model aims to provide an electronic reverse stitch wrench mechanism of a sewing machine which has a simple structure and is easy to install.

[0004] The utility model is achieved in this way:

[0005] An electronic reverse-sewing wrench mechanism of a sewing machine, the sewing machine comprising a casing, the electronic reverse-sewing wrench mechanism comprising a reverse-sewing wrench and a reverse-sewing wrench shaft, an induction bracket being arranged on the casing, the induction bracket comprising a bracket body and a shaft sleeve, the bracket body being fixedly arranged on the casing, the reverse-sewing wrench and the shaft sleeve being sleeved on the reverse-sewing wrench shaft, relative displacement being able to occur between the reverse-sewing wrench and the induction bracket, an induction Hall plate being arranged on the bracket body, an induction magnet being arranged on the reverse-sewing wrench, the induction Hall plate and the induction magnet being arranged opposite to each other and paired for induction, the induction Hall plate being electrically connected to a controller controlling the action of a needle distance adjustment motor, and the reverse-sewing wrench being reset by a reset mechanism.

[0006] In the above-mentioned electronic reverse stitch wrench mechanism of a sewing machine, the bracket body and the sleeve are an integrated structure, the sleeve passes through the front and rear sides of the bracket body, and one end of the sleeve is fixedly connected to the reverse stitch wrench shaft by a radially arranged screw, and the reverse stitch wrench is rotatably arranged on the reverse stitch wrench shaft.

[0007] In the above-mentioned electronic reverse-sewing wrench mechanism of a sewing machine, a retaining ring is provided on the reverse-sewing wrench shaft at the outer end of the reverse-sewing wrench, and the reverse-sewing wrench is limited between the retaining ring and the shaft sleeve.

[0008] In the above-mentioned electronic reverse-sewing wrench mechanism of a sewing machine, the bracket body and the shaft sleeve are split structures, the shaft sleeve is fixedly connected to the casing, the reverse-sewing wrench shaft is rotatably connected to the shaft sleeve, and the reverse-sewing wrench rotates synchronously with the reverse-sewing wrench shaft.

[0009] In the above-mentioned electronic reverse stitch wrench mechanism of a sewing machine, the reverse stitch wrench includes a pressing section, an arm section, a connecting part and an extension arm, the pressing section is located at one end of the arm section and extends to the front side of the casing, the connecting part is located at the other end of the arm section and is sleeved on the reverse stitch wrench shaft, the extension arm is located on the outer cylindrical surface of the connecting part, and the induction magnet is located at the upper end of the extension arm.

[0010] In the above-mentioned electronic reverse-stitch wrench mechanism of a sewing machine, the two ends of the induction Hall plate are spaced apart from the bracket body by spacers, and are fixedly connected to the bracket body by screws.

[0011] In the above-mentioned electronic reverse stitch wrench mechanism of a sewing machine, the reset mechanism is a torsion spring, which is sleeved on the reverse stitch wrench shaft or sleeved on the shaft sleeve, one end of the torsion spring is connected to the reverse stitch wrench, and the other end is connected to the torsion spring limit pin, and the torsion spring limit pin is connected to the casing.

[0012] In the above-mentioned electronic reverse-sewing wrench mechanism of a sewing machine, an upper limit sleeve and a lower limit sleeve are further provided on the housing, and the reverse-sewing wrench is located between the upper limit sleeve and the lower limit sleeve.

[0013] In the above-mentioned electronic reverse-stitch wrench mechanism of a sewing machine, a sleeve mounting hole is provided on the housing, and one end of the sleeve is inserted into the sleeve mounting hole.

[0014] In the above-mentioned electronic reverse-stitch wrench mechanism of a sewing machine, the shaft sleeve mounting hole is a blind hole.

[0015] The outstanding advantages of the utility model compared with the prior art are:

[0016] The utility model senses the change of magnetic flux lines caused by the rotation of the induction magnet arranged on the reverse stitching spanner by means of an induction Hall plate arranged on the induction bracket, and sends the detected signal to the controller. With the cooperation of the controller and the needle distance adjustment motor, reverse stitching or close stitching is achieved, with fewer parts, compact structure, easy installation, and reduced production costs. Description of the drawings:

[0017] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0018] Figure 2 It is one of the three-dimensional schematic diagrams of the electronic back-stitch wrench mechanism of the utility model;

[0019] Figure 3 This is the second three-dimensional schematic diagram of the electronic back-stitch wrench mechanism of the utility model;

[0020] Figure 4 It is an exploded schematic diagram of the electronic back-stitch wrench mechanism of the utility model;

[0021] Figure 5 It is a left view of the electronic back-stitch wrench mechanism of the utility model;

[0022] Figure 6 yes Figure 5 AA section view;

[0023] Figure 7 It is a schematic diagram of the casing of the utility model;

[0024] Figure 8 It is a schematic diagram of the induction bracket of the utility model;

[0025] Fig. 9 It is a schematic diagram of the reverse seam wrench of the utility model.

[0026] In the figure: 1. housing; 2. reverse seam wrench; 3. reverse seam wrench shaft; 4. induction bracket; 5. induction Hall plate; 6. induction magnet; 7. pressing section; 8. support arm section; 9. connecting part; 10. extension arm; 11. bracket body; 12. bushing; 13. spacer; 14. torsion spring; 15. torsion spring limit pin; 16. upper limit sleeve; 17. lower limit sleeve; 18. bushing mounting hole; 19. retaining ring. Specific implementation method:

[0027] The present invention is further described below with specific embodiments:

[0028] like Figure 1-Figure 9 As shown, the utility model provides an electronic reverse stitch wrench mechanism of a sewing machine, the sewing machine comprises a housing 1, the electronic reverse stitch wrench mechanism comprises a reverse stitch wrench 2, a reverse stitch wrench shaft 3, an induction bracket 4 is arranged on the housing 1, the induction bracket 5 comprises a bracket body 11 and a shaft sleeve 12, the bracket body 11 is fixed on the housing 1, the reverse stitch wrench 2 and the shaft sleeve 12 are sleeved on the reverse stitch wrench shaft 3. Relative displacement can be generated between the reverse stitch wrench 2 and the induction bracket 4, the induction bracket 4 is provided with an induction Hall plate 5, the reverse stitch wrench 2 is provided with an induction magnet 6, the induction Hall plate 5 and the induction magnet 6 are arranged oppositely and paired for induction, the induction Hall plate 5 is electrically connected to a controller that controls the action of the needle distance adjustment motor, and the needle distance adjustment motor is connected to the needle distance adjustment mechanism. The reverse stitch wrench 2 is reset by a reset mechanism.

[0029] The utility model uses the Hall sensor detection method. In the initial state, the induction Hall plate 5 and the induction magnet 6 are relatively arranged. The reverse stitching wrench 2 is pressed down to drive the induction magnet 6 to start rotating. The induction Hall plate 5 sends the detected signal to the controller through the change of the magnetic flux lines generated by the rotation of the induction magnet 6. Under the cooperation of the controller and the needle distance adjustment motor, reverse stitching or close stitching is achieved. When the reverse stitching wrench 2 is released, the reverse stitching wrench 2 is driven to reset to the initial position under the action of the reset mechanism. At the same time as the reset, the needle distance also changes accordingly. At the initial position, the needle distance is the maximum positive value.

[0030] like Figure 1-Figure 4 and Fig. 9 As shown, the reverse seam wrench 2 includes a pressing section 7, an arm section 8, a connecting portion 9 and an extension arm 10, wherein the pressing section 7 is located at one end of the arm section 8 and extends to the front side of the housing 1, the connecting portion 9 is located at the other end of the arm section 8 and is sleeved on the reverse seam wrench shaft 2, the extension arm 10 is located on the outer cylindrical surface of the connecting portion 9, and the induction magnetic steel 6 is located at the upper end of the extension arm 10. When the pressing section 7 is pressed, the connecting portion 9 will rotate around its axis, thereby driving the extension arm 10 and the induction magnetic steel 6 to rotate.

[0031] It should be noted that the induction magnetic steel 6 described in the present invention is embedded in the extension arm 10. Fig. 9 As shown, a groove is provided on the side of the upper end of the extension arm 10 close to the induction Hall plate 5, and the induction magnetic steel 6 is embedded therein. In addition, a protrusion can also be provided on the upper end of the extension arm 10, and the induction magnetic steel 6 is embedded in the protrusion. The method of providing a groove can make the structure more compact.

[0032] like Figure 1-Figure 5 and Figure 8 As shown, the support body 11 and the shaft sleeve 12 are an integrated structure, the shaft sleeve 12 passes through the front and rear sides of the support body 11, and one end of the shaft sleeve 12 is fixedly connected to the reverse seam wrench shaft 3 by a radially arranged screw, and the reverse seam wrench 2 is rotatably arranged on the reverse seam wrench shaft 3. At this time, the reverse seam wrench shaft 3 and the housing 1 are in a non-rotating relationship. The reverse seam wrench 2 rotates around the reverse seam wrench shaft 3. In order to limit the reverse seam wrench 2 on the reverse seam wrench shaft 3, a retaining ring 19 is arranged on the reverse seam wrench shaft 3 at the outer end of the reverse seam wrench 2, and the retaining ring 19 and the shaft sleeve 12 limit the reverse seam wrench 2 axially.

[0033] It should be noted that the integrated structure described here may be a structure in which the bracket body 11 and the shaft sleeve 12 are non-detachable, or may be an integral structure in which the bracket body 11 and the shaft sleeve 12 are connected together by an assembly relationship.

[0034] like Figure 7As shown, in order to install the induction bracket 4 , the utility model provides a sleeve mounting hole 18 on one end surface of the housing 1 , and one end of the sleeve 12 is inserted into the sleeve mounting hole 18 .

[0035] If the bracket body 11 and the sleeve 12 are split structures, the sleeve 12 can be fixedly connected to the sleeve mounting hole 18 on the casing 1 by glue. At this time, the reverse stitch spanner shaft 3 is rotationally connected to the sleeve 12, and the reverse stitch spanner 2 rotates synchronously with the reverse stitch spanner shaft 3. For example, the reverse stitch spanner shaft 3 and the reverse stitch spanner 2 are fixedly connected by screws. Or, a spline hole is provided on the reverse stitch spanner 2, and a spline is provided on the reverse stitch spanner shaft 3. In order to achieve axial limitation of the reverse stitch spanner shaft 3, one end of the reverse stitch spanner shaft 3 can be extended into the sleeve mounting hole 18, and a limiter is provided for limiting, and the limiter is against the sleeve 12. At this time, the reverse stitch spanner 2 and the reverse stitch spanner shaft 3 rotate together around the axis of the reverse stitch spanner shaft 3.

[0036] like Figure 1-Figure 4 As shown, the two ends of the induction Hall plate 5 are spaced apart from the bracket body 11 by a spacer 13, and are fixedly connected to the bracket body 11 by screws. The spacer 13 can be a plastic spacer.

[0037] As described above, the reverse seam wrench 2 of the utility model is reset by a reset mechanism. As one of the embodiments of the reset mechanism, the reset mechanism is a torsion spring 14, and the torsion spring 14 is sleeved on the reverse seam wrench shaft 3 or on the sleeve 12 between the bracket body 11 and the connecting part 9 of the reverse seam wrench 2. One end of the torsion spring 14 is connected to the support arm section 8 of the reverse seam wrench 2, and the other end is connected to the torsion spring limit pin 15, and the torsion spring limit pin 15 is connected to the housing 1.

[0038] When the reverse seam wrench 2 is pressed downward, the pressure is greater than the torsion of the torsion spring 14, causing the end of the torsion spring 14 to deform. When the force pressing on the reverse seam wrench 2 disappears, the end of the torsion spring 14 is reset to drive the reverse seam wrench 2 to reset.

[0039] In addition, as another embodiment of the reset mechanism, the utility model can be provided with a lower spring pin on the arm section of the reverse seam wrench 2, and an upper spring pin is provided above the reverse seam wrench, and the upper spring pin is fixed on the housing 1. The two ends of the spring are respectively connected to the lower spring pin and the upper spring pin.

[0040] like Figure 1 As shown, in order to limit the rotational travel of the reverse seam wrench 2 , an upper limit sleeve 16 and a lower limit sleeve 17 are further provided on the housing 1 , and the arm section 8 of the reverse seam wrench 2 is located between the upper limit sleeve 16 and the lower limit sleeve 17 .

[0041] Furthermore, the shaft sleeve mounting hole 18 is a blind hole, which can avoid oil leakage and does not need to be configured with a tight seam structure, thus simplifying the structure.

[0042] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An electronic reverse-sewing wrench mechanism for a sewing machine, the sewing machine comprising a housing (1), the electronic reverse-sewing wrench mechanism comprising a reverse-sewing wrench (2) and a reverse-sewing wrench shaft (3), characterized in that: An induction bracket (4) is arranged on the casing (1), the induction bracket (4) comprises a bracket body (11) and a shaft sleeve (12), the bracket body (11) is fixedly arranged on the casing (1), the reverse seam wrench (2) and the shaft sleeve (12) are sleeved on the reverse seam wrench shaft (3), relative displacement can be generated between the reverse seam wrench (2) and the induction bracket (4), an induction Hall plate (5) is arranged on the bracket body (11), an induction magnet (6) is arranged on the reverse seam wrench (2), the induction Hall plate (5) and the induction magnet (6) are arranged opposite to each other and paired for induction, the induction Hall plate (5) is electrically connected to a controller for controlling the action of a needle distance adjustment motor, and the reverse seam wrench (2) is reset by a reset mechanism.

2. The electronic reverse stitch wrench mechanism of a sewing machine according to claim 1, characterized in that: The support body (11) and the shaft sleeve (12) are an integrated structure; the shaft sleeve (12) passes through the front and rear sides of the support body (11); one end of the shaft sleeve (12) is fixedly connected to the reverse seam wrench shaft (3) via a radially arranged screw; and the reverse seam wrench (2) is rotatably arranged on the reverse seam wrench shaft (3).

3. The electronic reverse stitch wrench mechanism of a sewing machine according to claim 2, characterized in that: A retaining ring (19) is provided on the reverse seam wrench shaft (3) at the outer end of the reverse seam wrench (2), and the reverse seam wrench (2) is limited between the retaining ring (19) and the shaft sleeve (12).

4. The electronic reverse-sewing wrench mechanism of a sewing machine according to claim 1, characterized in that: The support body (11) and the shaft sleeve (12) are of split structure; the shaft sleeve (12) is fixedly connected to the housing (1); the reverse seam wrench shaft (3) is rotatably connected to the shaft sleeve (12); and the reverse seam wrench (2) and the reverse seam wrench shaft (3) rotate synchronously.

5. The electronic reverse stitch wrench mechanism of a sewing machine according to claim 2 or 4, characterized in that: The reverse seam wrench (2) comprises a pressing section (7), an arm section (8), a connecting portion (9) and an extension arm (10); the pressing section (7) is located at one end of the arm section (8) and extends to the front side of the housing (1); the connecting portion (9) is located at the other end of the arm section (8) and is sleeved on the reverse seam wrench shaft (3); the extension arm (10) is located on the outer cylindrical surface of the connecting portion (9); and the induction magnetic steel (6) is located at the upper end of the extension arm (10).

6. The electronic reverse stitch wrench mechanism of a sewing machine according to claim 1, characterized in that: The two ends of the induction Hall plate (5) are spaced apart from the support body (11) by spacers (13), and are fixedly connected to the support body (11) by screws.

7. An electronic back-stitch wrench mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The reset mechanism is a torsion spring (14), which is sleeved on the reverse seam wrench shaft (3) or sleeved on the shaft sleeve (12), one end of the torsion spring (14) is connected to the reverse seam wrench (2), and the other end is connected to the torsion spring limit pin (15), and the torsion spring limit pin (15) is connected to the housing (1).

8. The electronic reverse stitch wrench mechanism of a sewing machine according to claim 7, characterized in that: The housing (1) is also provided with an upper limit sleeve and a lower limit sleeve, and the reverse seam wrench (2) is located between the upper limit sleeve and the lower limit sleeve.

9. An electronic back-stitch wrench mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The housing (1) is provided with a shaft sleeve mounting hole (18), and one end of the shaft sleeve (12) is inserted into the shaft sleeve mounting hole (18).

10. The electronic reverse-sewing wrench mechanism of a sewing machine according to claim 9, characterized in that: The shaft sleeve mounting hole (18) is a blind hole.

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