Sewing Machine

Abstract

The invention provides a sewing machine, comprising a casing, an outer presser foot, an inner presser foot, a connecting assembly, a driving structure, a limit connecting rod and a manual adjustment mechanism, wherein the outer presser foot and the inner presser foot are both movably arranged in a vertical direction, the connecting assembly is connected to both the outer presser foot and the inner presser foot, and the connecting assembly comprises a swinging member, and the driving structure is drivingly connected to the swinging member; the driving structure drives the swinging member to swing, so that the inner presser foot and the outer presser foot move in opposite directions under the drive of the connecting assembly, the limit connecting rod is pivotally arranged in the casing with the first end of the limit connecting rod as the rotation center, the limit connecting rod is connected to the driving structure, and the manual adjustment mechanism is drivingly connected to the first end of the limit connecting rod, so as to adjust the position of the rotation center of the limit connecting rod through the manual adjustment mechanism to adjust the size of the predetermined angle, thereby adjusting the alternation amount between the inner presser foot and the outer presser foot. The invention solves the problem that the sewing machine in the prior art cannot adjust the alternation amount of the inner and outer presser feet.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machine manufacturing, in particular to a sewing machine. Background Art

[0002] In sewing machines that do not use feed teeth to move the fabric, an inner presser foot is usually installed inside the outer presser foot to prevent friction between the fabric and the needle, which causes the fabric and the needle to rise together and cause skipped stitches. When the sewing machine is working normally, the inner presser foot and the outer presser foot alternately press the sewn material on the needle plate.

[0003] The alternation between the inner and outer presser feet of the sewing machine in the prior art cannot be adjusted. When the material has different thicknesses at different positions, the fabric is too thick, or the fabric slopes, sewing will not be able to proceed normally if the alternation between the inner and outer presser feet is not increased. Summary of the invention

[0004] The main purpose of the present invention is to provide a sewing machine to solve the problem that the sewing machine in the prior art cannot adjust the alternating amount of the inner and outer presser feet.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a sewing machine, comprising: a casing; an outer presser foot, which is movably arranged in a vertical direction; an inner presser foot, which is movably arranged in a vertical direction; a connecting assembly, which is connected to both the outer presser foot and the inner presser foot, and the connecting assembly includes a swinging member; a driving structure, which is drivingly connected to the swinging member; the driving structure drives the swinging member to swing, so that the inner presser foot and the outer presser foot move in opposite directions driven by the connecting assembly; a limiting link, which is pivotally arranged in the casing with the first end of the limiting link as the rotation center, and the second end of the limiting link is connected to the driving structure, and is used to limit the swinging member to swing within a predetermined angle; a manual adjustment mechanism, which is drivingly connected to the first end of the limiting link, so as to adjust the size of the predetermined angle by adjusting the position of the rotation center of the limiting link through the manual adjustment mechanism, thereby adjusting the alternation amount between the inner presser foot and the outer presser foot.

[0006] Furthermore, the connecting assembly also includes: a first connecting rod, a first end of the first connecting rod is hinged to the swinging member; a mounting block, the mounting block has three connecting ends arranged around its circumference, one connecting end of the mounting block is hinged to the second end of the first connecting rod, and the other connecting end of the mounting block is hinged to the top of the outer presser foot; a second connecting rod, a first end of the second connecting rod is hinged to the other connecting end of the mounting block, and the second end of the second connecting rod is hinged to the top of the inner presser foot.

[0007] Furthermore, the manual adjustment mechanism includes: an adjustment block, the first end of the limit link is hinged to the first end of the adjustment block; an adjustment shaft, the adjustment shaft is fixedly connected to the second end of the adjustment block; and an adjustment knob, the adjustment knob is drivingly connected to the adjustment shaft, so that the adjustment shaft is driven to rotate with the second end of the adjustment block as the rotation center by rotating the adjustment knob, and the first end of the adjustment block drives the first end of the limit link to move, so as to change the position of the rotation center of the limit link.

[0008] Furthermore, the adjusting knob is rotatably arranged in the horizontal direction, and a limiting curved surface is provided inside the adjusting knob, and the distance between the limiting curved surface and the inner circumferential wall of the adjusting knob gradually decreases along the circumference of the adjusting knob; the manual adjusting mechanism also includes a transmission assembly, and the adjusting knob is driven and connected to the adjusting shaft through the transmission assembly; wherein the transmission assembly includes a limiting member, the limiting member is connected to the adjusting shaft, and the limiting member is in contact with the limiting curved surface; by rotating the adjusting knob, the limiting member is pushed to drive the adjusting shaft to rotate synchronously.

[0009] Furthermore, the transmission assembly also includes: a connecting sleeve, which is arranged on the adjusting shaft and is spaced apart from the adjusting block; the limiting member is a limiting column, which is fixedly connected to the connecting sleeve and extends upward, and the top of the limiting column extends into the adjusting knob; a tension spring, which extends in a vertical direction, the first end of the tension spring is connected to the connecting sleeve, and the second end of the tension spring is fixedly connected to the casing; the connecting sleeve rotates under the action of the tension spring, and drives the limiting column to move in a direction close to the center position of the adjusting knob, so that the top of the limiting column is always in contact with the limiting curved surface.

[0010] Furthermore, the adjusting knob is located outside the casing, and a serration structure is provided on the end surface of the adjusting knob facing the casing, and the serration structure is circumferentially arranged around the adjusting knob; the manual adjustment mechanism also includes: a mounting shaft, and the adjusting knob is pivotally connected to the casing through the mounting shaft; a stop plate, the stop plate is sleeved on the mounting shaft and fixedly connected to the mounting shaft, and an avoidance opening for avoiding the limit column is provided on the stop plate, and the avoidance opening extends radially along the stop plate, and the stop plate includes a stop structure, and the stop structure cooperates with the serration structure to stop rotation; wherein, by driving the adjusting knob to rotate relative to the stop structure, the limit column moves in the avoidance opening, thereby adjusting the position of the rotation center of the limit connecting rod; when the external force acting on the adjusting knob is cancelled, the adjusting knob stays at the rotation position under the action of the stop structure.

[0011] Furthermore, the sewing machine also includes a driving cylinder, which is arranged in the casing, and the output end of the driving cylinder telescopically moves in the vertical direction and is drivably connected to the connecting sleeve; the casing has a limiting structure for cooperating with the limiting column; by controlling the output end of the driving cylinder to extend a predetermined distance, the output end of the driving cylinder drives the limiting column to move and abut against the limiting structure, thereby adjusting the alternation amount between the inner presser foot and the outer presser foot to reach a maximum value.

[0012] Furthermore, the outer circumferential surface of the adjusting knob is marked with a plurality of scale values ​​representing the alternating amount, and the plurality of scale values ​​are arranged at intervals around the circumference of the adjusting knob.

[0013] Furthermore, the adjusting knob is fixedly connected to the adjusting shaft and is located outside the housing, so that the adjusting shaft is driven to rotate by rotating the adjusting knob.

[0014] Furthermore, the driving structure includes: a rotating shaft, which is pivotally arranged in the casing; an eccentric wheel, which is sleeved on the rotating shaft and fixedly connected to the rotating shaft; a connecting piece, which is in contact and cooperates with the eccentric wheel; a transmission connecting rod, a first end of the transmission connecting rod is hinged to the connecting piece, a second end of the transmission connecting rod is hinged to the swinging piece, and a limit connecting rod is hinged to the connecting piece; the rotating shaft drives the eccentric wheel to rotate synchronously with the axis of the rotating shaft as the rotation center, the connecting piece moves under the pushing action of the eccentric wheel, the transmission connecting rod moves with the eccentric wheel and drives the swinging piece to swing, and the swinging piece swings within a predetermined angle under the limiting action of the limit connecting rod.

[0015] Furthermore, the sewing machine also includes a sensor connected to the driving cylinder signal, and the sensor is used to detect the thickness of the cloth, so that when the sensor detects that the thickness of the cloth increases, the output end of the driving cylinder is controlled to extend.

[0016] The technical solution of the present invention is applied, and a connecting assembly connected to both the inner presser foot and the outer presser foot is provided, and a driving structure drivingly connected to the connecting assembly is provided, wherein the connecting assembly includes a swinging member, and the driving structure is drivingly connected to the swinging member. The swinging member is driven by the driving structure to swing, so that the inner presser foot and the outer presser foot move in opposite directions under the drive of the connecting assembly. The swinging angle of the swinging member determines the alternation amount between the inner presser foot and the outer presser foot. The application also provides a pivotally arranged limit connecting rod connected to the driving structure, and a manual adjustment mechanism drivingly connected to the limit connecting rod, the limit connecting rod is used to limit the swinging of the swinging member within a predetermined angle, and the position of the rotation center of the limit connecting rod can be adjusted by the manual adjustment mechanism, and when the rotation center of the limit connecting rod changes, the swinging angle of the swinging member will change accordingly, thereby being able to change the alternation amount between the inner presser foot and the outer presser foot. The sewing machine provided by the present application solves the problem in the prior art that the sewing machines cannot adjust the alternation amount of the inner and outer presser feet. When the thickness of the material being sewn increases or the fabric slopes, the position of the rotation center of the limit connecting rod can be adjusted through a manual adjustment mechanism to increase the alternation amount between the inner and outer presser feet and ensure smooth sewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1A schematic structural diagram of a sewing machine according to an optional embodiment of the present invention is shown;

[0019] Figure 2 Shows Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 Shows Figure 1 Schematic diagram of the disassembled structure of a sewing machine;

[0021] Figure 4 Shows Figure 1 A schematic diagram of the structure of a manual adjustment mechanism, a driving cylinder and a fixed shaft of a sewing machine;

[0022] Figure 5 Shows Figure 4 A bottom view of an adjustment knob of a manual adjustment mechanism;

[0023] Figure 6 Shows Figure 1 A schematic structural diagram of a connecting part, a transmission connecting rod, a limit connecting rod, an adjusting block, an adjusting shaft and a connecting sleeve of a sewing machine.

[0024] The above drawings include the following reference numerals:

[0025] 10. External presser foot; 11. External presser foot connecting rod; 20. Internal presser foot; 21. Internal presser foot connecting rod; 22. Guide protrusion; 31. Swinging member; 32. First connecting rod; 33. Mounting block; 34. Second connecting rod; 40. Driving structure; 41. Rotating shaft; 42. Eccentric wheel; 43. Connecting member; 44. Transmission connecting rod; 50. Limit connecting rod; 60. Manual adjustment mechanism; 61. Adjustment block; 611. Mounting hole; 612. Mounting slot; 62. Adjustment shaft; 63. Adjustment knob; 631. Limiting curved surface; 632. Sawtooth structure; 633, scale value; 64, transmission assembly; 641, connecting sleeve; 642, limit piece; 643, tension spring; 65, mounting shaft; 66, anti-rotation plate; 661, opening; 662, anti-rotation structure; 663, avoidance opening; 70, driving cylinder; 80, connecting shaft; 90, connecting sleeve; 91, assembly hole; 110, bearing; 120, fixing piece; 150, guide sleeve; 160, guide block; 161, guide groove; 170, slider; 171, mounting hole; 180, fixed shaft. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to solve the problem that the sewing machine in the prior art cannot adjust the alternating amount of the inner and outer presser feet, the present invention provides a sewing machine.

[0028] like Figures 1 to 6 As shown, the sewing machine includes a housing, an outer presser foot 10, an inner presser foot 20, a connecting assembly, a driving structure 40, a limit connecting rod 50 and a manual adjustment mechanism 60. The outer presser foot 10 is movably arranged in a vertical direction, and the inner presser foot 20 is movably arranged in a vertical direction. The connecting assembly is connected to both the outer presser foot 10 and the inner presser foot 20, and the connecting assembly includes a swinging member 31, and the driving structure 40 is drivingly connected to the swinging member 31; the driving structure 40 drives the swinging member 31 to swing, so that the inner presser foot 20 and the outer presser foot 10 are moved in the connecting assembly. The limit link 50 is driven to move in the opposite direction by the limit link 50, and the limit link 50 is pivotally arranged in the casing with the first end of the limit link 50 as the rotation center. The second end of the limit link 50 is connected to the driving structure 40, and is used to limit the swinging member 31 to swing within a predetermined angle. The manual adjustment mechanism 60 is drivingly connected to the first end of the limit link 50, so as to adjust the position of the rotation center of the limit link 50 through the manual adjustment mechanism 60 to adjust the size of the predetermined angle, thereby adjusting the alternation amount between the inner presser foot 20 and the outer presser foot 10.

[0029] In the present application, a connecting assembly connected to both the inner presser foot 20 and the outer presser foot 10, and a driving structure 40 drivingly connected to the connecting assembly are provided, wherein the connecting assembly includes a swinging member 31, and the driving structure 40 is drivingly connected to the swinging member 31. By controlling the driving structure 40 to drive the swinging member 31 to swing, the inner presser foot 20 and the outer presser foot 10 are moved in opposite directions under the drive of the connecting assembly. Wherein, the swinging angle of the swinging member 31 determines the alternation amount between the inner presser foot 20 and the outer presser foot 10. The present application is provided with a pivotable limiting connecting rod 50 connected to the driving structure 40, and a manual adjustment mechanism 60 drivingly connected to the limiting connecting rod 50, the limiting connecting rod 50 is used to limit the swinging member 31 to swing within a predetermined angle, the position of the rotation center of the limiting connecting rod 50 can be adjusted by the manual adjustment mechanism 60, when the rotation center of the limiting connecting rod 50 changes, the swinging angle of the swinging member 31 will change accordingly, and then the alternation amount between the inner presser foot 20 and the outer presser foot 10 can be changed. The sewing machine provided in the present application solves the problem in the prior art that the sewing machines cannot adjust the alternation amount of the inner and outer presser feet. When the thickness of the material being sewn increases or the fabric slopes, the position of the rotation center of the limit link 50 can be adjusted by the manual adjustment mechanism 60 to increase the alternation amount between the inner and outer presser feet and ensure smooth sewing.

[0030] like Figure 3 As shown, the connecting assembly also includes a first connecting rod 32, a mounting block 33 and a second connecting rod 34. The first end of the first connecting rod 32 is hinged to the swing member 31, the mounting block 33 has three connecting ends arranged around its circumference, one connecting end of the mounting block 33 is hinged to the second end of the first connecting rod 32, the other connecting end of the mounting block 33 is hinged to the top of the outer presser foot 10, the first end of the second connecting rod 34 is hinged to the other connecting end of the mounting block 33, and the second end of the second connecting rod 34 is hinged to the top of the inner presser foot 20.

[0031] by Figure 3 For example, when the swing member 31 rotates clockwise, the swing member 31 drives the first connecting rod 32 to move to the left, the mounting block 33 moves to the left under the pull of the first connecting rod 32, and also rotates counterclockwise, the mounting block 33 drives the inner presser foot 20 connected thereto to rise to the lifting position, and the outer presser foot 10 drops to the falling position; when the swing member 31 rotates counterclockwise, the swing member 31 drives the first connecting rod 32 to move to the right, the mounting block 33 moves to the right under the pull of the first connecting rod 32, and also rotates clockwise, the mounting block 33 drives the inner presser foot 20 connected thereto to drop to the falling position, and the outer presser foot 10 rises to the lifting position. Optionally, the clockwise rotation angle of the swing member 31 is the same as the counterclockwise rotation angle.

[0032] Optionally, the mounting block 33 is arranged in a triangle shape, and the three connection ends are respectively located at three corners of the mounting block 33 arranged in a triangle shape.

[0033] Optionally, the sewing machine has a guide groove 161 extending in the vertical direction; the inner presser foot 20 includes an inner presser foot connecting rod 21 and a guide protrusion 22, the second end of the second connecting rod 34 is hinged to the top of the inner presser foot connecting rod 21, the guide protrusion 22 is fixedly connected to the inner presser foot connecting rod 21, and at least part of the guide protrusion 22 extends into the guide groove 161. In this way, the guide protrusion 22 slides in the guide groove 161, and the guide groove 161 is used to guide the inner presser foot connecting rod 21, thereby ensuring that the inner presser foot connecting rod 21 moves in the vertical direction.

[0034] Optionally, the guide protrusion 22 and the inner presser foot connecting rod 21 are integrally formed.

[0035] The mounting block 33 is directly connected to the outer presser foot connecting rod 11, and the mounting block 33 is connected to the inner presser foot connecting rod 21 through the second connecting rod 34. At the same time, under the guiding action of the guide groove 161 and the guide sleeve 150, the outer presser foot connecting rod 11 and the inner presser foot connecting rod 21 are ensured to move alternately and smoothly in the vertical direction.

[0036] like Figure 1 and Figure 2 As shown, the sewing machine further includes a guide block 160 disposed in the housing, and a guide groove 161 extending in the vertical direction is provided on the guide block 160. In order to simplify the processing of the housing and flexibly set the position of the guide protrusion 22, an additional guide block 160 is provided, and a guide groove 161 cooperating with the guide protrusion 22 is provided on the guide block 160. When the groove wall of the guide groove 161 is worn, the guide block 160 can be replaced to achieve maintenance, which is beneficial to the maintenance of the sewing machine and reduces the maintenance cost of the sewing machine.

[0037] In an optional embodiment of the present application which is not shown in the figure, a guide groove 161 extending in the vertical direction is provided on the inner wall of the housing. In this way, the parts of the sewing machine can be reduced, thereby simplifying the assembly process of the sewing machine and improving the assembly efficiency of the sewing machine.

[0038] In an optional embodiment not shown in the figure of the present application, the mounting block 33 is directly connected to the inner presser foot connecting rod 21, and the mounting block 33 is connected to the outer presser foot connecting rod 11 through a second connecting rod. The inner presser foot connecting rod 21 is guided by a guide sleeve, and the outer presser foot connecting rod 11 is guided by a guide protrusion and a guide groove.

[0039] like Figure 1 and Figure 2As shown, the sewing machine further includes a slider 170, which is movably disposed in the guide groove 161; the slider 170 has a mounting hole 171, and the guide protrusion 22 extends into the mounting hole 171. In this way, the guide protrusion 22 drives the slider 170 to slide in the guide groove 161, and there is no need to make the guide protrusion 22 fit the guide groove 161, which can reduce the processing accuracy requirements for the guide protrusion 22, thereby reducing the processing requirements for the inner presser foot 20, avoiding the overall replacement of the inner presser foot 20 after the guide protrusion 22 is worn, which is beneficial to the maintenance of the sewing machine.

[0040] like Figure 4 As shown, the manual adjustment mechanism 60 includes an adjustment block 61, an adjustment shaft 62 and an adjustment knob 63. The first end of the limit link 50 is hinged to the first end of the adjustment block 61, the adjustment shaft 62 is fixedly connected to the second end of the adjustment block 61, and the adjustment knob 63 is drivingly connected to the adjustment shaft 62, so that the adjustment shaft 62 is driven to rotate with the second end of the adjustment block 61 as the rotation center by rotating the adjustment knob 63, and the first end of the adjustment block 61 drives the first end of the limit link 50 to move, so as to change the position of the rotation center of the limit link 50. In this way, the position of the rotation center of the limit link 50 is adjusted by rotating the adjustment knob 63, and the alternation amount between the inner and outer presser feet is changed.

[0041] like Figure 4 As shown, the adjusting knob 63 is rotatably arranged in the horizontal direction, and a limiting curved surface 631 is provided inside the adjusting knob 63. Figure 5 As shown in FIG. 1 , the distance between the limiting curved surface 631 and the inner peripheral wall of the adjusting knob 63 gradually decreases along the circumference of the adjusting knob 63. Figure 5 In the optional embodiment shown, the distance between the limiting surface 631 and the inner circumferential wall of the adjusting knob 63 gradually decreases in a clockwise direction; the manual adjusting mechanism 60 also includes a transmission assembly 64, and the adjusting knob 63 is driven and connected to the adjusting shaft 62 through the transmission assembly 64; wherein the transmission assembly 64 includes a limiting member 642, and the limiting member 642 is connected to the adjusting shaft 62, and the limiting member 642 is in contact with the limiting surface 631; by rotating the adjusting knob 63, the limiting member 642 is pushed to drive the adjusting shaft 62 to rotate synchronously, thereby changing the position of the rotation center of the limiting link 50.

[0042] like Figure 4As shown, the transmission assembly 64 also includes a connecting sleeve 641 and a tension spring 643. The connecting sleeve 641 is sleeved on the adjustment shaft 62 and is spaced apart from the adjustment block 61. The limiting member 642 is a limiting column, which is fixedly connected to the connecting sleeve 641 and extends upward. The top of the limiting column extends into the adjustment knob 63. The tension spring 643 extends in the vertical direction. The first end of the tension spring 643 is connected to the connecting sleeve 641, and the second end of the tension spring 643 is fixedly connected to the casing. The connecting sleeve 641 rotates under the action of the tension spring 643, and drives the limiting column to move toward the direction close to the center position of the adjustment knob 63, so that the top of the limiting column is always in contact with the limiting curved surface 631. When the adjustment knob 63 is rotated, the specific position where the limiting curved surface 631 is in contact with the limiting column is changed. The specific position is close to the center of the adjustment knob 63 or away from the center of the adjustment knob 63 relative to the original position. Figure 5 For example, when the adjusting knob 63 rotates clockwise, the limit column overcomes the spring force under the push of the limit surface 631 and moves in the direction away from the center of the adjusting knob, and the limit column drives the connecting sleeve 641, the adjusting shaft 62, the adjusting block 61 and the limit link 50 to rotate synchronously, thereby changing the position of the rotation center of the limit link 50 and changing the alternation amount of the inner and outer presser feet.

[0043] like Figure 1 and Figure 2 As shown, a mounting hole 611 is provided on the adjusting block 61, and the adjusting block 61 is sleeved on the adjusting shaft 62 through the mounting hole 611. A first fixing hole extending along the radial direction of the adjusting shaft 62 and connected to the mounting hole 611 is provided on the adjusting block 61, and a second fixing hole extending along the radial direction of the adjusting shaft 62 is provided on the adjusting shaft 62; the sewing machine also includes a fixing member 120, which passes through the first fixing hole and the second fixing hole in sequence to fix the adjusting block 61 to the adjusting shaft 62.

[0044] like Figure 4As shown, the adjustment knob 63 is located outside the housing, which is convenient for the user to manually rotate the adjustment knob 63. The end surface of the adjustment knob 63 facing the housing is provided with a serration structure 632, and the serration structure 632 is arranged around the circumference of the adjustment knob 63; the manual adjustment mechanism 60 also includes a mounting shaft 65 and a stopper 66. The adjustment knob 63 is pivotally connected to the housing through the mounting shaft 65. The stopper 66 is sleeved on the mounting shaft 65 and fixedly connected to the mounting shaft 65. The stopper 66 is provided with a stopper for avoiding the limit column. The avoidance opening 663 extends radially along the anti-rotation plate 66, and the anti-rotation plate 66 includes a anti-rotation structure 662, and the anti-rotation structure 662 cooperates with the serration structure 632 to stop rotation; wherein, by driving the adjusting knob 63 to rotate relative to the anti-rotation structure 662, the limiting column moves in the avoidance opening 663, thereby adjusting the position of the rotation center of the limiting link 50; when the external force acting on the adjusting knob 63 is cancelled, the adjusting knob 63 stays at the rotation position under the action of the anti-rotation structure 662.

[0045] Optionally, the anti-rotation plate 66 is provided with a plurality of openings 661 extending radially along the anti-rotation plate 66. The plurality of openings 661 are arranged at circumferential intervals around the anti-rotation plate 66, and a anti-rotation structure 662 is formed between two adjacent openings 661. The anti-rotation structure 662 is pulled upward to bend upward and cooperate with the serration structure 632 to stop rotation. When the adjusting knob 63 is driven to rotate relative to the anti-rotation structure 662, the friction between the anti-rotation structure 662 and the serration structure 632 is overcome. By setting the serration structure 632, the friction between the adjusting knob 63 and the anti-rotation plate 66 is increased. When the external force acting on the adjusting knob 63 is cancelled, it is ensured that the adjusting knob 63 stays at the rotation position under the action of the anti-rotation structure 662.

[0046] Optionally, there are multiple anti-rotation structures 662, and the multiple anti-rotation structures 662 are arranged at intervals around the circumference of the anti-rotation plate 66. By increasing the number of anti-rotation structures 662, the friction between the anti-rotation plate 66 and the adjustment knob 63 is increased.

[0047] like Figure 4 As shown, the sewing machine also includes a driving cylinder 70, which is arranged in the housing, and the output end of the driving cylinder 70 telescopically moves in the vertical direction and is drivingly connected to the connecting sleeve 641; the housing has a limiting structure for limiting with the limiting column; by controlling the output end of the driving cylinder 70 to extend a predetermined distance, the output end of the driving cylinder 70 drives the limiting column to move and abuts against the limiting structure, thereby adjusting the alternation between the inner presser foot 20 and the outer presser foot 10 to a maximum value. In this way, if the sewing machine cannot work normally due to the thickening of the fabric during the sewing process, the alternation between the inner and outer presser feet can be adjusted to a maximum by controlling the output end of the driving cylinder 70 to extend.

[0048] like Figure 4As shown, the sewing machine also includes a fixed shaft 180 connected to the casing, and the driving cylinder 70 is connected to the casing via the fixed shaft 180; the second end of the tension spring 643 is fixedly connected to the fixed shaft 180, so that the tension spring is fixedly connected to the casing via the fixed shaft 180.

[0049] like Figure 3 and Figure 4 As shown, the outer circumferential surface of the adjusting knob 63 is marked with a plurality of scale values ​​633 representing the alternating amount, and the plurality of scale values ​​633 are arranged at intervals around the circumference of the adjusting knob 63. In this way, the alternating amount of the inner and outer presser feet of the sewing machine can be accurately adjusted according to the scale values ​​633 indicated on the adjusting knob 63, thereby improving the practicality and convenience of operation of the sewing machine, and being conducive to improving the user experience.

[0050] In an optional embodiment of the present application which is not shown in the figure, the adjusting knob 63 is fixedly connected to the adjusting shaft 62 and is located outside the housing, so that the adjusting shaft 62 is driven to rotate by rotating the adjusting knob 63. In this way, the adjusting knob 63 directly drives the adjusting shaft 62 to rotate, which simplifies the structure of the sewing machine and reduces the manufacturing cost of the sewing machine.

[0051] like Figure 1 , Figure 2 and Figure 6 The driving structure 40 includes a rotating shaft 41, an eccentric wheel 42, a connecting member 43 and a transmission connecting rod 44. The rotating shaft 41 is pivotally arranged in the housing. The eccentric wheel 42 is sleeved on the rotating shaft 41 and fixedly connected to the rotating shaft 41. The connecting member 43 contacts and cooperates with the eccentric wheel 42. The first end of the transmission connecting rod 44 is hinged to the connecting member 43. The second end of the transmission connecting rod 44 is hinged to the swinging member 31. The limiting connecting rod 50 is hinged to the connecting member 43. The rotating shaft 41 drives the eccentric wheel 42 to rotate synchronously with the axis of the rotating shaft 41 as the rotation center. The connecting member 43 moves under the driving action of the eccentric wheel 42. The transmission connecting rod 44 moves with the eccentric wheel 42 and drives the swinging member 31 to swing. The swinging member 31 swings within a predetermined angle under the limiting action of the limiting connecting rod 50. When the position of the rotation center of the limiting connecting rod 50 changes, the swinging angle of the swinging member 31 will also change accordingly, thereby changing the alternation amount between the inner and outer presser feet.

[0052] like Figure 1 and Figure 2 As shown, a mounting groove 612 is provided on the adjustment block 61, and the connecting protrusion extends into the mounting groove 612. The transmission link 44 and the limit link 50 are both located in the mounting groove 612 and are hinged to the connecting protrusion through a connecting pin; the mounting groove 612 has two groove walls arranged along the axial direction of the adjustment shaft 62, and the connecting protrusion, the transmission link 44 and the limit link 50 are clamped between the two groove walls to limit the axial movement of the connecting protrusion, the transmission link 44 and the limit link 50 along the adjustment shaft 62, thereby improving the movement stability between the components.

[0053] like Figure 4 As shown, there are two transmission connecting rods 44, the connecting protrusion is located between the two transmission connecting rods 44, and there are two limiting connecting rods 50, the two transmission connecting rods 44 are located between the two limiting connecting rods 50. In order to ensure the transmission stability between the various parts, two transmission connecting rods 44 and two limiting connecting rods 50 are provided.

[0054] like Figure 1 and Figure 3 As shown, the connecting member 43 includes a connecting ring, which is sleeved on the eccentric wheel 42, the first end of the transmission connecting rod 44 is hinged to the outer peripheral wall of the connecting ring, and the limiting connecting rod 50 is hinged to the outer peripheral wall of the connecting ring. In this way, the connecting ring is sleeved on the eccentric wheel 42, which can improve the connection stability between the connecting member 43 and the eccentric wheel 42.

[0055] like Figure 3 As shown, the driving structure 40 further includes a bearing 110, and the connecting ring is sleeved on the eccentric wheel 42 through the bearing 110. In this way, the friction between the connecting ring and the eccentric wheel 42 can be reduced, and the connecting ring and the eccentric wheel 42 can be prevented from being worn.

[0056] like Figure 1 , Figure 2 and Figure 4 As shown, the sewing machine also includes a connecting shaft 80 and a connecting sleeve 90. The connecting shaft 80 is fixedly connected to the swinging member 31. The connecting sleeve 90 includes a connecting sleeve body and a protrusion that are connected to each other. An assembly hole 91 is provided on the connecting sleeve body. The connecting sleeve body is sleeved on the connecting shaft 80 through the assembly hole 91. The second end of the transmission connecting rod 44 is hinged to the protrusion.

[0057] like Figure 1 As shown, when the sewing machine is working normally, the rotating shaft 41 rotates clockwise and drives the eccentric wheel 42 to rotate, the connecting ring moves under the push of the eccentric wheel 42, and the connecting ring rotates relative to the eccentric wheel 42 under the pull of the limit link 50. Since the rotation center of the limit link 50 remains unchanged, the limit angle of the swing of the connecting ring can be limited. The rotation of the connecting ring drives the connecting sleeve 90 to swing through the transmission link 44, and the connecting sleeve 90 drives the swinging member 31 to swing through the connecting shaft 80, thereby limiting the swing angle of the swinging member 31, and further limiting the value of the alternating amount of the inner and outer presser feet. When the alternating amount of the inner and outer presser feet needs to be changed, the adjusting knob 63 is used to drive the adjusting block 61 to rotate and drive the limit link 50 to rotate, change the rotation center of the limit link 50, complete the adjustment of the alternating amount of the inner and outer presser feet, and then repeat the above-mentioned normal operation process of the sewing machine.

[0058] Optionally, the sewing machine further comprises a motor for driving the rotating shaft 41 to rotate. Figure 1For example, the motor drives the rotating shaft 41 to rotate clockwise, and drives the connecting sleeve 90 to swing under the transmission of the transmission connecting rod 44 and the limiting connecting rod 50, thereby driving the swinging member 31 to swing.

[0059] Optionally, the sewing machine further includes a sensor connected to the driving cylinder 70 signal, and the sensor is used to detect the thickness of the fabric, so that when the sensor detects that the thickness of the fabric increases, the output end of the driving cylinder 70 is controlled to extend. The sewing machine provided by the present application can realize the manual adjustment of the alternating amount of the inner and outer presser feet of the sewing machine through the manual adjustment mechanism 60, and can realize the automatic adjustment of the alternating amount of the inner and outer presser feet of the sewing machine through the cooperation of the sensor and the driving cylinder 70, further improving the practicality of the sewing machine and the user experience.

[0060] When the sewing machine provided by the present application encounters a phenomenon that a certain section of the sewing fabric suddenly thickens when sewing leather or thick materials, the alternating amount of the inner and outer presser feet can be adjusted in real time through the manual adjustment mechanism 60, which solves the problem that the sewing machine in the prior art cannot adjust the alternating amount of the inner and outer presser feet. When the thickness of the fabric is too thick or the fabric is climbing, the alternating amount of the inner and outer presser feet can be increased by controlling the adjustment knob 63 of the manual adjustment mechanism 60 to rotate; when the thickness of the fabric returns to normal, the adjustment knob is controlled to rotate to the initial position, so that the alternating amount of the inner and outer presser feet is restored to the initial value, thereby making sewing more convenient, and the adjustment method of the alternating amount of the inner and outer presser feet is simple and easy to operate.

[0061] When the adjusting knob 63 is rotated to make the limiting column contact the inner wall of the adjusting knob, the adjusting block 61 is rotated to the maximum rotation fixed position, so that the swing angle of the swing member 31 is adjusted to the maximum, thereby adjusting the alternation amount of the inner and outer presser feet to the maximum.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0068] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sewing machine, characterized in that: include: chassis; An external presser foot (10), wherein the external presser foot (10) is movably arranged in a vertical direction; An inner presser foot (20), wherein the inner presser foot (20) is movably arranged in a vertical direction; A connecting assembly, the connecting assembly being connected to both the outer presser foot (10) and the inner presser foot (20), and the connecting assembly comprising a swinging member (31); A driving structure (40), the driving structure (40) being drivingly connected to the swinging member (31); the driving structure (40) drives the swinging member (31) to swing, so that the inner presser foot (20) and the outer presser foot (10) move in opposite directions under the drive of the connecting assembly; a limit link (50), the limit link (50) being pivotally arranged in the housing with the first end of the limit link (50) as the rotation center, the second end of the limit link (50) being connected to the driving structure (40) and being used to limit the swinging member (31) from swinging within a predetermined angle; A manual adjustment mechanism (60), the manual adjustment mechanism (60) being drivingly connected to the first end of the limit link (50), so as to adjust the position of the rotation center of the limit link (50) through the manual adjustment mechanism (60) to adjust the size of the predetermined angle, thereby adjusting the alternation amount between the inner presser foot (20) and the outer presser foot (10); The manual adjustment mechanism (60) comprises: An adjusting block (61), wherein the first end of the limiting connecting rod (50) is hingedly connected to the first end of the adjusting block (61); an adjusting shaft (62), the adjusting shaft (62) being fixedly connected to the second end of the adjusting block (61); an adjusting knob (63), the adjusting knob (63) being drivingly connected to the adjusting shaft (62), so that the adjusting shaft (62) is driven to rotate with the second end of the adjusting block (61) as the rotation center by rotating the adjusting knob (63), and the first end of the adjusting block (61) drives the first end of the limiting connecting rod (50) to move, so as to change the position of the rotation center of the limiting connecting rod (50); The adjusting knob (63) is rotatably arranged in the horizontal direction, and a limiting curved surface (631) is provided inside the adjusting knob (63), and the distance between the limiting curved surface (631) and the inner peripheral wall of the adjusting knob (63) gradually decreases along the circumference of the adjusting knob (63); the manual adjusting mechanism (60) further comprises a transmission assembly (64), and the adjusting knob (63) is drivingly connected to the adjusting shaft (62) via the transmission assembly (64); The transmission assembly (64) comprises a limit member (642), the limit member (642) is connected to the adjustment shaft (62), and the limit member (642) is in contact with the limit curved surface (631); by rotating the adjustment knob (63), the limit member (642) is pushed to drive the adjustment shaft (62) to rotate synchronously; The transmission assembly (64) further comprises: a connecting sleeve (641), the connecting sleeve (641) being sleeved on the adjusting shaft (62) and spaced apart from the adjusting block (61); the limiting member (642) being a limiting column, the limiting column being fixedly connected to the connecting sleeve (641) and extending upward, the top of the limiting column extending into the adjusting knob (63); a tension spring (643), wherein the tension spring (643) extends in a vertical direction, a first end of the tension spring (643) is connected to the connecting sleeve (641), and a second end of the tension spring (643) is fixedly connected to the housing; the connecting sleeve (641) rotates under the action of the tension spring (643), and drives the limiting column to move in a direction close to the center position of the adjusting knob (63), so that the top of the limiting column is always in contact with the limiting curved surface (631); The adjusting knob (63) is located outside the housing; the end surface of the adjusting knob (63) facing the housing is provided with a sawtooth structure (632); the sawtooth structure (632) is arranged around the circumference of the adjusting knob (63); the manual adjusting mechanism (60) further comprises: A mounting shaft (65), wherein the adjusting knob (63) is pivotally connected to the housing via the mounting shaft (65); a rotation-stopping plate (66), the rotation-stopping plate (66) being sleeved on the mounting shaft (65) and fixedly connected to the mounting shaft (65), the rotation-stopping plate (66) being provided with an avoidance opening (663) for avoiding the limiting column, the avoidance opening (663) extending in the radial direction of the rotation-stopping plate (66), the rotation-stopping plate (66) comprising a rotation-stopping structure (662), the rotation-stopping structure (662) being matched with the sawtooth structure (632) for rotation-stopping; The adjusting knob (63) is driven to rotate relative to the anti-rotation structure (662), so that the limiting column moves in the avoidance opening (663), thereby adjusting the position of the rotation center of the limiting connecting rod (50); when the external force acting on the adjusting knob (63) is cancelled, the adjusting knob (63) stays at the rotation position under the action of the anti-rotation structure (662); The sewing machine further comprises a driving cylinder (70), wherein the driving cylinder (70) is arranged in the casing, and the output end of the driving cylinder (70) telescopically moves in the vertical direction and is drivingly connected to the connecting sleeve (641); the casing comprises a limiting structure for limiting the limiting column; by controlling the output end of the driving cylinder (70) to extend a predetermined distance, the output end of the driving cylinder (70) drives the limiting column to move and abut against the limiting structure, thereby adjusting the alternation between the inner presser foot (20) and the outer presser foot (10) to reach a maximum value.

2. The sewing machine according to claim 1, characterized in that: The connection component also includes: a first connecting rod (32), wherein a first end of the first connecting rod (32) is hingedly connected to the swinging member (31); A mounting block (33), the mounting block (33) having three connection ends arranged around the circumference thereof, one connection end of the mounting block (33) being hinged to the second end of the first connecting rod (32), and the other connection end of the mounting block (33) being hinged to the top of the outer presser foot (10); A second connecting rod (34), wherein a first end of the second connecting rod (34) is hinged to the other connecting end of the mounting block (33), and a second end of the second connecting rod (34) is hinged to the top of the inner presser foot (20).

3. The sewing machine according to claim 1, characterized in that: The outer circumferential surface of the adjusting knob (63) is marked with a plurality of scale values ​​(633) representing the alternating amount, and the plurality of scale values ​​(633) are arranged at intervals in the circumferential direction of the adjusting knob (63).

4. The sewing machine according to claim 1, characterized in that: The adjusting knob (63) is fixedly connected to the adjusting shaft (62) and is located outside the housing, so that the adjusting shaft (62) can be driven to rotate by rotating the adjusting knob (63).

5. The sewing machine according to claim 1, characterized in that: The driving structure (40) comprises: A rotating shaft (41), the rotating shaft (41) being pivotably disposed in the housing; an eccentric wheel (42), the eccentric wheel (42) being sleeved on the rotating shaft (41) and fixedly connected to the rotating shaft (41); A connecting member (43), the connecting member (43) being in contact with and fitting with the eccentric wheel (42); A transmission connecting rod (44), wherein a first end of the transmission connecting rod (44) is hinged to the connecting member (43), a second end of the transmission connecting rod (44) is hinged to the swing member (31), and the limit connecting rod (50) is hinged to the connecting member (43); The rotating shaft (41) drives the eccentric wheel (42) to rotate synchronously with the axis of the rotating shaft (41) as the rotation center; the connecting member (43) moves under the driving action of the eccentric wheel (42); the transmission connecting rod (44) moves with the eccentric wheel (42) and drives the swinging member (31) to swing; and the swinging member (31) swings within a predetermined angle under the limiting action of the limiting connecting rod (50).

6. The sewing machine according to claim 1, characterized in that The sewing machine further comprises a sensor connected to the drive cylinder (70) by signal, the sensor being used to detect the thickness of the cloth, so that when the sensor detects that the thickness of the cloth increases, the output end of the drive cylinder (70) is controlled to extend.

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