Automatic stitch length adjusting device of sewing machine

Abstract

The utility model belongs to the technical field of sewing equipment, and particularly relates to an automatic stitch length adjusting device of a sewing machine. Comprising a stitch length adjusting mechanism, the stitch length adjusting mechanism comprises a swing seat and further comprises a motor, the motor is installed on the front side face of a machine shell, a rotating shaft of the motor is connected with a stitch length adjusting shaft through a transmission assembly, and the stitch length adjusting shaft is rotationally arranged on the machine shell. The stitch length adjusting shaft is further connected with one end of a stitch length adjusting connecting rod through a second stitch length adjusting crank, and the other end of the stitch length adjusting connecting rod is connected with a swing seat. The motor is installed on the front side face of the machine shell, so that space on the right side face of the machine shell can be vacated, and optimal design of the sewing machine is facilitated.

Description

Technical field:

[0001] The utility model belongs to the technical field of sewing equipment, in particular to an automatic needle distance adjustment device for a sewing machine. Background technology:

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. A sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] The automation level of existing sewing machines is getting higher and higher. For example, the stitch length adjustment device has been converted from traditional manual adjustment to automatic adjustment. For example, the authorization announcement number CN 209323126U, application date 2018.11.12, announcement date 2019.08.30 discloses a sewing machine and its automatic stitch length adjustment device, and the authorization announcement number CN 209722460U, application date 2019.02.14, announcement date 2019.12.03 discloses an automatic stitch length adjustment mechanism and a sewing machine. However, the motor of the automatic stitch length adjustment mechanism is installed on the right end face of the sewing machine. In order to realize the comprehensive automation of the sewing machine, most of the mechanisms on the sewing machine are driven by a power source, such as a presser foot lifting mechanism, a differential momentum adjustment mechanism, a thread cutting mechanism, etc., which also leads to the need to install multiple power sources on the casing. The space on the right end face of the sewing machine is also limited, which will limit the optimization design of the sewing machine. Summary of the invention:

[0004] The utility model aims to provide a sewing machine needle distance automatic regulating device which can free up the space on the right side of the casing and facilitate the optimized design of the sewing machine.

[0005] The utility model is achieved in this way:

[0006] The invention discloses an automatic needle distance adjustment device for a sewing machine, comprising a needle distance adjustment mechanism, wherein the needle distance adjustment mechanism comprises a swing seat and a motor, wherein the motor is mounted on the front side of a casing, wherein the rotating shaft of the motor is connected to a needle distance adjustment shaft through a transmission assembly, wherein the needle distance adjustment shaft is rotatably arranged on the casing, wherein the needle distance adjustment shaft is also connected to one end of a needle distance adjustment connecting rod through a second needle distance adjustment crank, and the other end of the needle distance adjustment connecting rod is connected to the swing seat.

[0007] In the above-mentioned automatic stitch length adjustment device of a sewing machine, the transmission assembly includes a driving crank, a stitch length adjustment driving connecting rod, and a first stitch length adjustment crank connected in sequence, the first stitch length adjustment crank is connected to the stitch length adjustment shaft and drives the stitch length adjustment shaft to rotate, and the driving crank is connected to the rotating shaft of the motor and is driven by the rotating shaft.

[0008] In the above-mentioned automatic stitch length adjustment device for a sewing machine, the first stitch length adjustment crank and the stitch length adjustment shaft are an integrated structure.

[0009] In the above-mentioned automatic needle distance adjustment device for a sewing machine, the axis of the rotating shaft of the motor is arranged parallel to the needle distance adjustment axis.

[0010] In the above-mentioned automatic needle length adjustment device of a sewing machine, the swing seat is U-shaped, including a left arm and a right arm arranged in parallel and at intervals, and a crossbar connecting the left arm and the right arm. One end of the right arm connected to the crossbar extends outward to form an extension arm, and a connecting pin is arranged on the extension arm. The other end of the needle length adjustment connecting rod is connected to the connecting pin.

[0011] In the above-mentioned automatic needle distance adjustment device for a sewing machine, a mounting hole is provided on the extension arm, one end of the connecting pin is arranged in the mounting hole and is fixed to the extension arm by radially arranged screws.

[0012] In the above-mentioned automatic needle length adjustment device of a sewing machine, a through hole is provided at the other end of the needle length adjustment connecting rod, a connecting pin is passed through the through hole and one end thereof extends out of the through hole, and a limiting member is provided on the connecting pin outside the through hole to axially limit the needle length adjustment connecting rod.

[0013] In the above-mentioned automatic needle length adjustment device for a sewing machine, the motor is fixed on the front side of the casing through a motor bracket.

[0014] In the above-mentioned automatic needle length adjustment device for a sewing machine, the front side of the casing is formed with a recessed pit toward the rear side, and the motor is arranged in the recessed pit.

[0015] In the above-mentioned automatic needle length adjustment device for a sewing machine, the motor outer casing is provided with a motor cover, and the motor cover is fixedly arranged on the front side of the casing.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] 1. The motor of the utility model is installed on the front side of the casing, which can free up space on the right side of the casing to facilitate the optimized design of the sewing machine;

[0018] 2. The motor of the utility model is installed in the pit on the front side of the casing. The setting of the pit reduces the distance between the rotating shaft of the motor and the needle distance adjustment shaft, which not only makes the structure compact, but also reduces the size of the transmission component, makes the transmission more stable, and improves the adjustment accuracy;

[0019] 3. The motor of the utility model is provided with a motor cover outside, which facilitates unification of the design style of the motor cover with the design style of the sewing machine, so that the motor is arranged on the front side of the casing without affecting the overall shape of the sewing machine. Description of the drawings:

[0020] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0021] Figure 2 It is one of the schematic diagrams of the utility model installed on the casing and the bottom plate;

[0022] Figure 3 This is the second schematic diagram of the utility model installed on the casing and the bottom plate;

[0023] Figure 4 It is a schematic diagram of the swing seat of the utility model;

[0024] Figure 5 It is a schematic diagram of the motor bracket of the utility model;

[0025] Figure 6 It is a schematic diagram of the utility model in which the first stitch length adjustment crank and the stitch length adjustment shaft are integrated into a structure.

[0026] In the figure: 1. Motor; 2. Swing seat; 3. Casing; 4. Stitch adjustment shaft; 5. Second stitch adjustment crank; 6. Stitch adjustment connecting rod; 7. Presser foot lift and upper differential tooth control motor; 8. Drive crank; 9. Stitch adjustment drive connecting rod; 10. First stitch adjustment crank; 11. Left support arm; 12. Right support arm; 13. Cross bar; 14. Extension arm; 15. Connecting pin; 16. Motor bracket; 17. Mounting plate; 18. Fixing plate; 19. Motor cover; 20. Heat dissipation hole. Specific implementation method:

[0027] The present invention is further described below with reference to specific embodiments. Figure 1 —6:

[0028] The utility model provides an automatic needle distance adjustment device for a sewing machine, comprising a needle distance adjustment mechanism and a motor 1, wherein the needle distance adjustment mechanism is a prior art in the art, and therefore, its specific structure is not described in detail. The needle distance adjustment mechanism comprises a swing seat 2, and the motor 1 is mounted on the front side of a housing 3, and the front side is the side facing the operator. The rotating shaft of the motor 1 is connected to a needle distance adjustment shaft 4 through a transmission assembly, and the needle distance adjustment shaft 4 is rotatably arranged on the housing 3. The needle distance adjustment shaft 4 is also connected to one end of a needle distance adjustment connecting rod 6 through a second needle distance adjustment crank 5, and the other end of the needle distance adjustment connecting rod 6 is connected to the swing seat 2.

[0029] The utility model installs the motor 1 on the front side of the housing 3, which can free up space on the right side of the housing 3, facilitating the optimized design of the sewing machine. For example, the presser foot lifter and upper differential tooth control motor 7 can be installed on the right side of the housing 3 to drive the presser foot lifter mechanism and the differential adjustment mechanism.

[0030] Further, the transmission assembly includes a driving crank 8, a needle pitch adjustment driving connecting rod 9, and a first needle pitch adjustment crank 10 connected in sequence, the first needle pitch adjustment crank 10 is connected to the needle pitch adjustment shaft 4 and drives the needle pitch adjustment shaft 4 to rotate, and the driving crank 8 is connected to the rotating shaft of the motor 1 and is driven by the rotating shaft. After connection, the driving crank 8, the needle pitch adjustment driving connecting rod 9, and the first needle pitch adjustment crank 10 are located outside the right side of the housing 3.

[0031] It should be noted that, in this embodiment, the first stitch adjustment crank 10 and the stitch adjustment shaft 4 are an integrated structure, that is, the first stitch adjustment crank 10 is integrally formed at one end of the stitch adjustment shaft 4 .

[0032] The rotating shaft of the motor 1 starts to rotate, which in turn drives the driving crank 8, the needle distance adjustment driving connecting rod 9, the first needle distance adjustment crank 10, the first needle distance adjustment crank 10, the needle distance adjustment shaft 4, the second needle distance adjustment crank 5 and the needle distance adjustment connecting rod 6 to move, thereby driving the needle distance adjustment mechanism to move and achieve the purpose of needle distance adjustment.

[0033] Furthermore, the swing seat 2 is U-shaped, including a left arm 11 and a right arm 12 arranged in parallel and at intervals, and a cross piece 13 connecting the left arm 11 and the right arm 12. One end of the right arm 12 connected to the cross piece 13 extends outward to form an extension arm 14, and a connecting pin 15 is provided on the extension arm 14. The other end of the stitch length adjustment connecting rod 6 is connected to the connecting pin 15.

[0034] In order to fix the connecting pin 15 , a mounting hole is provided on the extension arm 14 , one end of the connecting pin 15 is arranged in the mounting hole and is fixed to the extension arm 14 by radially arranged screws.

[0035] In addition, the other end of the stitch length adjustment connecting rod 6 is provided with a through hole, the connecting pin 15 is inserted into the through hole and one end thereof extends out of the through hole, and a limiting member is provided on the connecting pin 15 outside the through hole to axially limit the stitch length adjustment connecting rod 6. Generally speaking, the limiting member is a retaining ring or a retaining spring.

[0036] The axis of the rotating shaft of the motor 1 of the utility model is arranged parallel to the stitch length adjustment shaft 4. The motor 1 is fixed on the front side of the housing 3 through a motor bracket 16.

[0037] Specifically, the motor bracket 16 includes a mounting plate 18 connected to the end of the motor 1 and a fixing plate 18 located on one side of the mounting plate 17 , and the fixing plate 18 is connected to the housing 3 by screws.

[0038] It should be noted that the front side of the housing 3 is concave toward the rear side, and the motor 1 is arranged in the concave. The arrangement of the concave reduces the distance between the rotating shaft of the motor and the needle distance adjustment shaft, which not only makes the structure compact, but also reduces the size of the transmission component, makes the transmission more stable, and improves the adjustment accuracy.

[0039] In addition, the motor 1 is covered with a motor housing 19, which is fixed on the front side of the housing 3. The motor housing 19 is provided with heat dissipation holes 20. This can protect the motor 1 and achieve heat dissipation effect, thereby extending the service life of the motor 1. The setting of the motor housing 19 can also improve the overall aesthetics of the sewing machine, so that the motor 1 is set on the front side of the housing 3 but not obtrusive.

[0040] 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 automatic needle distance adjustment device for a sewing machine, comprising a needle distance adjustment mechanism, wherein the needle distance adjustment mechanism comprises a swing seat (2), characterized in that: The invention also comprises a motor (1), wherein the motor (1) is mounted on the front side of the housing (3), the rotating shaft of the motor (1) is connected to the needle distance adjustment shaft (4) through a transmission assembly, the needle distance adjustment shaft (4) is rotatably arranged on the housing (3), the needle distance adjustment shaft (4) is also connected to one end of a needle distance adjustment connecting rod (6) through a second needle distance adjustment crank (5), and the other end of the needle distance adjustment connecting rod (6) is connected to the swing seat (2).

2. The automatic needle length adjustment device for a sewing machine according to claim 1, characterized in that: The transmission assembly comprises a driving crank (8), a needle distance adjustment driving connecting rod (9), and a first needle distance adjustment crank (10) which are connected in sequence. The first needle distance adjustment crank (10) is connected to the needle distance adjustment shaft (4) and drives the needle distance adjustment shaft (4) to rotate. The driving crank (8) is connected to the rotating shaft of the motor (1) and is driven by the rotating shaft to move.

3. The automatic needle length adjustment device for a sewing machine according to claim 2, characterized in that: The first stitch length adjustment crank (10) and the stitch length adjustment shaft (4) are an integrated structure.

4. The automatic needle length adjustment device for a sewing machine according to claim 1, characterized in that: The axis of the rotating shaft of the motor (1) is arranged parallel to the needle distance adjustment shaft (4).

5. The automatic needle length adjustment device for a sewing machine according to claim 1, 2, 3 or 4, characterized in that: The swing seat (2) is U-shaped and comprises a left support arm (11), a right support arm (12) and a horizontal piece (13) connected to the left support arm (11) and the right support arm (12) in parallel and at intervals. One end of the right support arm (12) connected to the horizontal piece (13) extends outward to form an extension arm (14). A connecting pin (15) is provided on the extension arm (14). The other end of the stitch length adjustment connecting rod (6) is connected to the connecting pin (15).

6. The automatic needle length adjustment device for a sewing machine according to claim 5, characterized in that: The extension arm (14) is provided with a mounting hole, one end of the connecting pin (15) is arranged in the mounting hole and is fixed to the extension arm (14) by means of radially arranged screws.

7. The automatic needle length adjustment device for a sewing machine according to claim 6, characterized in that: The other end of the stitch length adjustment connecting rod (6) is provided with a through hole, a connecting pin (15) is inserted into the through hole and one end thereof extends out of the through hole, and a limiting member is provided on the connecting pin (15) outside the through hole to axially limit the stitch length adjustment connecting rod (6).

8. The automatic needle length adjustment device for a sewing machine according to claim 1, 2, 3 or 4, characterized in that: The motor (1) is fixed on the front side of the casing (3) via a motor bracket (16).

9. The automatic needle length adjustment device for a sewing machine according to claim 8, characterized in that: The front side of the housing (3) is formed with a recessed pit which is recessed toward the rear side, and the motor (1) is arranged in the recessed pit.

10. The automatic needle length adjustment device for a sewing machine according to claim 9, characterized in that: The motor (1) is covered with a motor housing (19), and the motor housing (19) is fixed on the front side of the housing (3).

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