Sewing machine with adjustable stitch length

Abstract

The sewing machine comprises a base, a sewing machine frame, a cam, a needle seat assembly, an adjusting mechanism, a pull-down mechanism and a driving assembly, the upper end face of the base is fixedly connected with the sewing machine frame, one end of a vertical limb is fixedly connected with the base, and the other end of the vertical limb is provided with a horizontal limb and the cam. A pull-down mechanism is arranged on the outer side of the vertical limb, a driving assembly is arranged in the vertical limb and used for driving the cam and the pull-down mechanism, a needle seat assembly is arranged at the outer end of the horizontal limb, and an adjusting mechanism is arranged in the middle of the horizontal limb and used for adjusting the horizontal movement distance of the needle seat assembly; the rotating angle of the reciprocating assembly driven by the swing arm is changed by changing the fixed position of the connecting rod in the arc-shaped sliding groove, and therefore the transverse movement distance of the needle seat assembly is synchronously changed. The transverse movement distance of the needle seat assembly can be changed by detaching the bolt for fixing the connecting rod on the arc-shaped sliding block, so that the purpose of rapid adjustment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a sewing machine with adjustable stitch length. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitch patterns on the sewing material, so as to interweave and sew together one or more layers of sewing materials. When sewing, the sewing machine will use dense sewing or normal sewing according to needs. When using dense sewing, the stitch length is denser, so that the cut thread and the thread end are very short, making the stitch pattern sewn more beautiful. However, the density of the stitch length is generally adjusted manually. When adjusting the stitch length, it is also necessary to disassemble and replace the cam and other related parts. The whole process is very troublesome and seriously affects the use of the sewing machine. Therefore, in order to solve the above problems, a sewing machine with adjustable stitch length is designed. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing sewing machine technology, the purpose of the utility model is to provide a sewing machine with adjustable stitch length, which has the advantages of adjustable stitch length and convenient adjustment.

[0004] To achieve the above purpose, a technical solution adopted by the utility model is: a sewing machine with adjustable stitch length, including a base, a sewing machine frame, a cam, a needle seat assembly, an adjusting mechanism, a pulling-down mechanism and a driving assembly. The upper end surface of the base is fixedly connected with the sewing machine frame. The sewing machine frame has a vertical limb and a horizontal limb. One end of the vertical limb is fixedly connected with the base. The other end of the vertical limb is provided with a horizontal limb and a cam. A pulling-down mechanism is arranged outside the vertical limb. A driving assembly is arranged inside the vertical limb. The driving assembly is used to drive the cam and the pulling-down mechanism to operate. The outer end of the horizontal limb is provided with a needle seat assembly. The middle part of the horizontal limb is provided with an adjusting mechanism. The adjusting mechanism is used to adjust the horizontal moving distance of the needle seat assembly.

[0005] Preferably, the driving assembly includes a driving motor, bevel gears and a cam divider. The driving motor is arranged on the lower end surface of the base. The output shaft of the driving motor is fixedly connected with the cam and the bevel gears. The cam divider is arranged on one side of the vertical limb. The input end of the cam divider is driven by the bevel gears on the output shaft of the driving motor.

[0006] Preferably, the needle seat assembly includes a C-shaped bracket, a pulling-down block and a sewing rod. The C-shaped bracket is a quadrilateral bracket with an opening groove in the middle. The C-shaped bracket is slidably connected with the outer end of the horizontal limb of the sewing machine frame through a sliding column. The pulling-down block slides in the opening groove of the C-shaped bracket. The pulling-down block is fixedly connected with the middle part of the sewing rod. The sewing rod penetrates through the C-shaped bracket. The sliding direction of the sewing rod is perpendicular to the sliding direction of the C-shaped bracket in the same plane. The bottom of the sewing rod is used for installing a sewing needle.

[0007] Preferably, the adjusting mechanism includes a swing arm, an arc-shaped slider, a connecting rod, and a reciprocating component. The middle of the swing arm is hinged to the middle of the horizontal limb. One end of the swing arm is inserted into the cam through a sliding pin, and the other end of the swing arm is fixedly connected to the arc-shaped slider. The reciprocating component is rotatably connected to the outer end of the horizontal limb of the sewing machine frame, and the reciprocating component is arranged inside the needle base component. One end of the connecting rod is connected to the reciprocating component, and the other end of the connecting rod is fixedly bolted in the chute of the arc-shaped slider. The arc-shaped slider is arranged along the extension line of the swing arm. By changing the fixed position of the connecting rod in the arc-shaped chute, the rotation angle of the swing arm driving the reciprocating component is changed, so as to synchronously change the lateral movement distance of the needle base component.

[0008] More preferably, the reciprocating component includes a driving swing arm, a rotating shaft, a fork, and a swinging pin. The rotating shaft is rotatably connected to the horizontal limb of the sewing machine frame. One end of the rotating shaft is fixedly connected with the driving swing arm. The driving swing arm is connected to the connecting rod fixed in the arc-shaped slider. The other end of the rotating shaft is fixedly connected with only the fork. The fork is provided with a swinging pin, and the swinging pin is fixedly connected to the back of the C-shaped bracket. When the driving swing arm is driven by the adjusting mechanism, the driving swing arm drives the fork to swing reciprocally through the rotating shaft. Since the swinging pin is fixedly connected to the back of the C-shaped bracket, the driving swing arm swings and drives the C-shaped bracket to move laterally at the same time.

[0009] Preferably, the pulling-down mechanism includes a linkage rod and a rocker arm. The middle of the rocker arm is hinged to the side of the horizontal limb. One end of the rocker arm is connected to the output end of the cam divider through a linkage rod, and the other end of the rocker arm is connected to the pulling-down block in the needle base component through a linkage rod.

[0010] The beneficial effects of the present utility model are as follows: 1. By changing the fixed position of the connecting rod in the arc-shaped chute, the rotation angle of the swing arm driving the reciprocating component is changed, so as to synchronously change the lateral movement distance of the needle base component. 2. By removing the bolt that fixes the connecting rod to the arc-shaped slider, the lateral movement distance of the needle base component can be changed, so as to achieve the purpose of quick adjustment. Description of the Drawings

[0011] Figure 1 、 2 is the three-dimensional state structure view of the present utility model;

[0012] Figure 3 is the top view of the present utility model;

[0013] Figure 4 is the partial three-dimensional structure view of the connection relationship between the adjusting mechanism and the needle base component of the present utility model. Detailed Embodiments

[0014] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0015] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0016] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "provided with", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] Please refer to Figures 1 to 4 , the embodiments of the present utility model include:

[0018] A sewing machine with adjustable stitch length includes a base 1, a sewing machine frame 2, a cam 3, a needle holder assembly 4, an adjustment mechanism 5, a pulling-down mechanism 6, and a driving assembly 7. The upper end surface of the base 1 is fixedly connected with the sewing machine frame 2. The sewing machine frame 2 has a vertical limb 21 and a horizontal limb 22. One end of the vertical limb 21 is fixedly connected with the base 1, and the other end of the vertical limb 21 is provided with the horizontal limb 22 and the cam 3. The pulling-down mechanism 6 is arranged outside the vertical limb 21, and the driving assembly 7 is arranged inside the vertical limb 21. The driving assembly 7 is used to drive the cam 3 and the pulling-down mechanism 6 to operate. The outer end of the horizontal limb 22 is provided with the needle holder assembly 4, and the middle part of the horizontal limb 22 is provided with the adjustment mechanism 5. The adjustment mechanism 5 is used to adjust the horizontal moving distance of the needle holder assembly 4;

[0019] The driving assembly 7 includes a driving motor 71, bevel gears 72, and a cam divider 73. The driving motor 71 is arranged on the lower end surface of the base 1. The output shaft of the driving motor 71 is fixedly connected with the cam 3 and the bevel gears 72. The cam divider 73 is arranged on one side of the vertical limb 21, and the input end of the cam divider 73 is driven by the bevel gears 72 on the output shaft of the driving motor 71;

[0020] The needle seat assembly 4 includes a C-shaped bracket 41, a pull-down block 42, and a sewing rod 43. The C-shaped bracket 41 is a quadrilateral bracket with an opening groove in the middle. The C-shaped bracket 41 is slidably connected to the outer end of the horizontal limb 22 of the sewing machine frame 2 through a sliding column. The pull-down block 42 slides in the opening groove of the C-shaped bracket 41. The pull-down block 42 is fixedly connected to the middle of the sewing rod 43. The sewing rod 43 passes through the C-shaped bracket 41. The sliding direction of the sewing rod 43 is perpendicular to the sliding direction of the C-shaped bracket 41 in the same plane. The bottom of the sewing rod 43 is used to install a sewing needle;

[0021] The adjusting mechanism 5 includes a swing arm 51, an arc-shaped slider 52, a connecting rod 53, and a reciprocating assembly 8. The middle of the swing arm 51 is hinged to the middle of the horizontal limb 22. One end of the swing arm 51 is inserted into the cam 3 through a sliding pin. The other end of the swing arm 51 is fixedly connected to the arc-shaped slider 52. The reciprocating assembly 8 is rotatably connected to the outer end of the horizontal limb 22 of the sewing machine frame 2. The reciprocating assembly 8 is arranged inside the needle seat assembly 4. One end of the connecting rod 53 is connected to the reciprocating assembly 8. The other end of the connecting rod 53 is fixedly bolted in the sliding groove of the arc-shaped slider 52. The arc-shaped slider 52 is arranged along the extension line of the swing arm 51; By changing the fixed position of the connecting rod 53 in the arc-shaped sliding groove, the rotation angle of the swing arm 51 driving the reciprocating assembly 8 is changed, so as to synchronously change the lateral movement distance of the needle seat assembly 4;

[0022] The reciprocating assembly 8 includes a driving swing arm 81, a rotating shaft 82, a fork 83, and a swinging pin 84. The rotating shaft 82 is rotatably connected to the horizontal limb 22 of the sewing machine frame 2. One end of the rotating shaft 82 is fixedly connected with a driving swing arm 81. The driving swing arm 81 is connected to the connecting rod 53 fixed in the arc-shaped slider 52. The other end of the rotating shaft 82 is fixedly connected with only a fork 83. The fork 83 is provided with a swinging pin 84. The swinging pin 84 is fixedly connected to the back of the C-shaped bracket 41; When the driving swing arm 81 is driven by the adjusting mechanism 5, the driving swing arm 81 drives the fork 83 to swing reciprocally through the rotating shaft 82. Since the swinging pin 84 is fixedly connected to the back of the C-shaped bracket 41, the driving swing arm 81 swings and drives the C-shaped bracket 41 to move laterally at the same time;

[0023] The pull-down mechanism 6 includes a linkage rod 61 and a rocker arm 62. The middle of the rocker arm 62 is hinged to the side of the horizontal limb 22. One end of the rocker arm 62 is connected to the output end of the cam divider 73 through a linkage rod 61. The other end of the rocker arm 62 is connected to the pull-down block 42 in the needle seat assembly 4 through a linkage rod 61;

[0024] With the above settings, in the actual working process, the specific working principle is as follows:

[0025] When adjusting the stitch pitch: First, remove the bolt that fixes the connecting rod 53 to the arc-shaped slider 52, so that the connecting rod 53 can slide freely in the chute of the arc-shaped slider 52. By changing the fixed position of the connecting rod 53 in the arc-shaped chute, the distance between the fixed position of the connecting rod 53 and the hinge point of the swing arm 51 changes, thereby changing the rotation angle of the swing arm 51 driving the reciprocating assembly 8, and simultaneously synchronously changing the lateral movement distance of the needle base assembly 4. After the lateral movement distance of the needle base assembly 4 is adjusted, tighten the bolt to fix the connecting rod 53 in the arc-shaped chute, thereby completing the adjustment of the stitch pitch.

[0026] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A sewing machine with adjustable stitch length, characterized in that: It includes a base, a sewing machine frame, a cam, a needle seat assembly, an adjusting mechanism, a pull-down mechanism and a driving assembly. The upper end surface of the base is fixedly connected to the sewing machine frame, and the sewing machine frame has a vertical limb and a horizontal limb. One end of the vertical limb is fixedly connected to the base, and the other end of the vertical limb is provided with a horizontal limb and a cam. A pull-down mechanism is provided on the outer side of the vertical limb, and a driving assembly is provided inside the vertical limb. The driving assembly is used to drive the cam and the pull-down mechanism to operate. A needle seat assembly is provided at the outer end of the horizontal limb, and an adjusting mechanism is provided in the middle of the horizontal limb. The adjusting mechanism is used to adjust the horizontal movement distance of the needle seat assembly.

2. The sewing machine with adjustable stitch length according to claim 1, characterized in that: The driving assembly includes a driving motor, a bevel gear and a cam divider. The driving motor is arranged on the lower end surface of the base. The output shaft of the driving motor is fixedly connected to the cam and the bevel gear. The cam divider is arranged on one side of the vertical limb. The input end of the cam divider is driven by the bevel gear on the output shaft of the driving motor.

3. The sewing machine with adjustable stitch length according to claim 1, characterized in that: The needle seat assembly includes a C-shaped bracket, a pull-down block and a sewing rod. The C-shaped bracket is a quadrilateral bracket with an open groove in the middle. The C-shaped bracket is slidably connected to the outer end of the horizontal limb of the sewing machine frame through a sliding column. The pull-down block slides in the open groove of the C-shaped bracket. The pull-down block is fixedly connected to the middle of the sewing rod. The sewing rod passes through the C-shaped bracket. The sliding direction of the sewing rod is perpendicular to the sliding direction of the C-shaped bracket in the same plane. The bottom of the sewing rod is used to install a sewing needle.

4. The sewing machine with adjustable stitch length according to claim 1, characterized in that: The adjusting mechanism includes a swing arm, an arc-shaped slider, a connecting rod and a reciprocating assembly. The middle part of the swing arm is hinged at the middle part of the horizontal limb. One end of the swing arm is inserted into the cam through a sliding pin. The other end of the swing arm is fixedly connected to the arc-shaped slider. The reciprocating assembly is rotatably connected to the outer end of the horizontal limb of the sewing machine frame. The reciprocating assembly is arranged on the inner side of the needle seat assembly. One end of the connecting rod is connected to the reciprocating assembly. The other end of the connecting rod is fixed in the slide groove of the arc-shaped slider by bolts. The arc-shaped slider is arranged along the extension line of the swing arm.

5. The sewing machine with adjustable stitch length according to claim 4, characterized in that: The reciprocating assembly includes a driving swing arm, a rotating shaft, a shift fork and a swing pin. The rotating shaft is rotatably connected to the horizontal limb of the sewing machine frame. One end of the rotating shaft is fixedly connected to the driving swing arm, and the driving swing arm is connected to a connecting rod fixed in an arc-shaped slider. The other end of the rotating shaft is fixedly connected to a shift fork, and a swing pin is provided in the shift fork. The swing pin is fixedly connected to the back of the C-shaped bracket.

6. The sewing machine with adjustable stitch length according to claim 1, characterized in that: The pull-down mechanism includes a linkage rod and a rocker arm, the middle part of the rocker arm is hinged on the side of the horizontal limb, one end of the rocker arm is connected to the output end of the cam divider through the linkage rod, and the other end of the rocker arm is connected to the pull-down block in the needle seat assembly through the linkage rod.

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