Trimming driving structure of sewing machine
By designing a thread-cutting drive structure with swing arms one and two in a sewing machine and utilizing the lever effect to adjust the drive stroke, the problem of insufficient drive of the thread-cutting mechanism in a limited space is solved, and effective thread cutting is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-03-31
AI Technical Summary
The existing sewing machine thread-cutting mechanism has insufficient drive within a limited space, resulting in the thread-cutting action not being completed effectively.
The wire-cutting drive structure employs a combination of swing arms one and two with a cylinder, utilizing the leverage effect to effectively drive the hook within a limited space. The drive stroke is adjusted by rotating and sliding the swing arms to ensure sufficient shearing force between the hook and the fixed blade.
Effective thread-cutting action is achieved within the compact space of the sewing machine, avoiding jamming and interference between the thread hook and the sliding hole, ensuring that the thread can be cut.
Smart Images
Figure CN224063051U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to sewing machine technical field relates to a sewing machine's thread cutting drive structure. BACKGROUND
[0002] Sewing machine is with one or more sewing thread, on the seam material forms one or more stitch, makes one or more seam material interweaving or sewn together machine. The sewing thread of above-mentioned specifically includes face thread and bottom thread, after the sewing work is finished, needs to cut off two, so that face thread and bottom thread are separated from cloth, then control the presser foot to lift and extract the product of completion processing from the table surface of sewing machine.
[0003] For the thread cutting mechanism in the prior art, it generally includes a knife plate, a fixed knife fixed on the knife plate, a thread hook slidingly connected to the knife plate, the thread hook has a thread hooking groove opposite to the position of the fixed knife head, and the thread hooking groove hooks and pulls the sewing thread in a tension state close to the fixed knife head by sliding the thread hook on the knife plate towards the fixed knife during thread cutting, and the sewing thread is cut off by shearing action.
[0004] For the driving of the thread hook, a sliding hole in the form of a long strip is generally formed on the knife plate, a connecting pin fixed with the thread hook is slidingly connected in the sliding hole, a cylinder connected with the connecting pin is installed in the base of the sewing machine, the sliding of the connecting pin in the sliding hole is controlled by the extension and contraction of the driving end of the cylinder, and then the thread hooking groove of the thread hook is close to or away from the fixed knife.
[0005] However, in fact, due to the complexity of the internal parts of the sewing machine, the internal space of the base is very cramped, the space left for installing the cylinder itself is relatively limited, and it is also necessary to leave space for the extension and contraction of the driving end of the cylinder to meet the sliding amount of the thread hook, which is relatively difficult, and often the moving amount of the thread hook is not enough for the fixed knife to cut the sewing thread after the driving of the cylinder, which cannot meet the actual use requirement. SUMMARY
[0006] The utility model aims at the above-mentioned problems existing in prior art, and provides a thread cutting drive structure of sewing machine, and the technical problem to be solved by the utility model is how to drive the thread cutting mechanism to complete thread cutting in limited space.
[0007] The utility model discloses a sewing machine's thread cutting drive structure, sewing machine includes the blade that the top surface is equipped with the thread hook, be equipped with the slide hole of strip shape on the blade, the thread hook is fixed with the connecting pin sliding connection in the slide hole, its characterized in that, thread cutting drive structure includes the swing arm one and swing arm two that are hinged on the blade bottom surface, the swing of swing arm one's end is equipped with strip hole one, the connecting pin sliding connection is in strip hole one, swing arm two is connected fixed with the drive pin for connecting with the pneumatic cylinder, swing arm two is connected with swing arm one and can drive swing arm one rotates around the hinge.
[0008] The working principle of the thread cutting drive structure of the sewing machine is that the drive pin is first pushed outward by the driving of the pneumatic cylinder, at this time, the swing arm two connected with the drive pin makes the rotating end thereof rotate around the hinge of the blade along with the linear motion of the drive pin, and the swing end thereof also performs a corresponding swing action at the same time, in this state, the swing arm one connected with the swing arm two is pushed to make the rotating end thereof rotate around the hinge of the blade, and the swing end thereof also performs a corresponding swing action at the same time, the movement of the swing end makes the swing arm one drive the connecting pin to slide from the rear end to the front end of the slide hole, due to the arrangement of the strip hole one, the connecting pin can slide in the strip hole one during the swing of the swing arm one, thereby avoiding the situation that the connecting pin and the hole wall of the slide hole are stuck and interfered, and ensuring that the connecting pin is always in a linear motion state under the guidance of the hole wall of the slide hole, after the position thereof is located at the front end of the slide hole, the thread hook fixed thereto also slides on the blade and hooks the sewing thread, then the drive pin is pulled inward by the driving of the pneumatic cylinder, and the connecting pin slides from the front end to the rear end of the slide hole according to the same transmission, at this time, the thread hook can hook the sewing thread and pull it inward, the sewing thread in the tension state is cut off by the shearing force generated by the cooperation of the thread hook and the blade head of the fixed blade on the blade, compared with the prior art, the utility model realizes the effective adjustment of the driving stroke of the driving member by reasonable design of the swing arm drive structure and utilization of the lever effect in the limited space, thereby avoiding the insufficient driving stroke of the pneumatic cylinder in the prior art and avoiding the situation that the thread cutting mechanism cannot effectively control the thread cutting action.
[0009] In the thread cutting driving structure of the sewing machine, a second strip-shaped hole is arranged on the swing arm one between the rotating end and the swing end, and has the same length direction as the first strip-shaped hole; a driving pin is fixed on the swing end of the swing arm two, and is slidably connected in the second strip-shaped hole.
[0010] In the thread cutting driving structure of the sewing machine, a fixed hole is arranged on the swing arm two between the rotating end and the swing end, and the driving pin is fixed in the fixed hole. Thus, the connection stability of the driving pin and the swing arm two is ensured, and the space below the cutter plate is reasonably utilized, so that the transmission between the cylinder and the swing arm two is completed in a compact space, thereby controlling the thread hook to cooperate with the fixed cutter on the cutter plate to cut the sewing thread.
[0011] In the thread cutting driving structure of the sewing machine, the bottom of the cutter plate is fixed with a first fixed shaft and a second fixed shaft arranged oppositely on both sides of the sliding hole; the rotating end of the swing arm one is rotatably connected with the first fixed shaft, and the rotating end of the swing arm two is rotatably connected with the second fixed shaft. Thus, the swing arm one cooperates with the first fixed shaft, and the swing arm two cooperates with the second fixed shaft, so that the swing arm one and the swing arm two are hingedly connected with the cutter plate.
[0012] In the thread cutting driving structure of the sewing machine, a torsion spring is sleeved on the second fixed shaft above the swing arm two with one end fixed; a connecting hole is arranged on the swing arm two between the fixed hole and the rotating end, and the other end of the torsion spring is clamped in the connecting hole. Thus, after the cylinder completes the transmission of the driving pin to make the thread hook cooperate with the fixed cutter to cut the thread, the swing arm two is quickly swung back around the second fixed shaft by the opposite elastic force of the torsion spring.
[0013] In the thread cutting driving structure of the sewing machine, the thread hook comprises a long strip-shaped main body and a plate-shaped connecting part formed on one side of the main body, the connecting pin is fixed on the connecting part, a guide pin slidingly connected in the sliding hole is also fixed on the connecting part, and the guide pin and the connecting pin are arranged along the length direction of the main body. The guide pin is arranged to further limit the sliding direction of the thread hook together with the connecting pin and the sliding hole wall, so that the sliding of the thread hook is always on the same straight line.
[0014] Compared with the prior art, the thread cutting driving structure of the sewing machine has the following advantages:
[0015] The driving member is arranged in the base of the sewing machine, the rotation of the swing arm one and the swing arm two realizes the transmission of the torque, the lever effect is achieved in the limited space to adjust the driving of the thread hook, and the thread cutting mechanism can complete the thread cutting action. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic view of the thread cutting driving structure of the sewing machine.
[0017] Figure 2 is a structural schematic view of the thread cutting driving structure of the sewing machine from another perspective.
[0018] Figure 3 is a structural schematic view of the knife plate.
[0019] Figure 4 is a structural schematic view of the swing arm one.
[0020] Figure 5 is a structural schematic view of the swing arm two.
[0021] Figure 6 is a structural schematic view of the thread hook.
[0022] In the figure, 1 is a knife plate, 11 is a thread hook, 111 is a connecting pin, 112 is a main body, 13 is a connecting part, 1131 is a guide pin, 12 is a sliding hole, 13 is a swing arm one, 131 is a strip-shaped hole one, 132 is a strip-shaped hole two, 14 is a swing arm two, 141 is a driving pin, 142 is a transmission pin, 143 is a fixed hole, 144 is a connecting hole, 15 is a fixed shaft one, 16 is a fixed shaft two, and 161 is a torsional spring. DETAILED DESCRIPTION
[0023] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.
[0024] For example, Figures 1-3As shown, in the thread-cutting drive structure of this sewing machine, the sewing machine includes a blade plate 1 with a sliding hole 12 on its surface. The sliding hole 12 is specifically elongated. A fixing shaft 15 is fixed on one side of the sliding hole 12 on the bottom surface of the blade plate 1, and a fixing shaft 16 is fixed on the other side of the sliding hole 12 on the bottom surface of the blade plate 1. The fixing shaft 15 and the fixing shaft 16 are arranged opposite to each other. A thread hook 11 is provided on the top surface of the blade plate 1. Figure 6 Specifically, the hook 11 includes a long strip-shaped main body 112 and a plate-shaped connecting part 113 formed on one side of the main body 112. The connecting part 113 has two through holes spaced apart along the length of the main body 112. A guide pin 1131 is engaged in one of the through holes, and a connecting pin 111 is engaged in the other through hole. Both the connecting pin 111 and the guide pin 1131 are slidably connected in the sliding hole 12.
[0025] Combination Figure 4 and Figure 5 The wire-cutting drive structure includes a first swing arm 13 and a second swing arm 14, each having a rotating end and a swinging end. The rotating end of the first swing arm 13 is hinged to a first fixed shaft 15, and the rotating end of the second swing arm 14 is hinged to a second fixed shaft 16. A strip-shaped hole 131 is provided at the swinging end of the first swing arm 13, and a connecting pin 111 is slidably connected in the strip-shaped hole 131. A second strip-shaped hole 132 with the same length direction as the strip-shaped hole 131 is provided on the first swing arm 13 and located between the swinging end and the rotating end. A transmission pin 142 is fixed on the swinging end of the second swing arm 14 and is slidably connected in the second strip-shaped hole 132. A fixing hole 143 is provided on the second swing arm 14 and located between the swinging end and the rotating end (which can be understood as near the middle of the second swing arm 14). A drive pin 141 for connecting with a cylinder is engaged in the fixing hole 143.
[0026] like Figure 3 and Figure 5 As shown, a torsion spring 161 is sleeved on the fixed shaft 16 and located above the swing arm 14. One end of the torsion spring 161 is connected and fixed to the housing of the sewing machine. A connecting hole 144 is provided on the swing arm 14 and located between the rotating end and the fixed hole 143. The other end of the torsion spring 161 is engaged in the connecting hole 144.
[0027] Working principle: the cylinder operates and pushes the driving pin 141 forward, so that the swing arm 2 14 rotates clockwise around the fixed shaft 2 16, at this time the transmission pin 142 exerts force on the swing arm 1 13 with the swing action of the swing arm 2 14, pushes the swing arm 1 13 to swing counterclockwise around the fixed shaft 1 15, and drives the connecting pin 111 to slide forward in the sliding hole 12, so that the main body 112 of the wire hook 11 moves forward relative to the blade 1 to hook the suture, and then the cylinder reverses and pulls the driving pin 141 backward, so that the swing arm 2 14 rotates counterclockwise around the fixed shaft 2 16, at this time the transmission pin 142 exerts force on the swing arm 1 13 with the swing action of the swing arm 2 14, pulls the swing arm 2 14 to swing clockwise around the fixed shaft 1 15, and drives the connecting pin 111 to slide backward in the sliding hole 12, so that the main body 112 of the wire hook 11 and the fixed blade on the blade 1 generate a shearing force to cut the suture in tension, and then the cylinder stops running, and the elastic force generated by the torsion of the torsional spring 161 pulls the swing arm 2 14 to quickly reset to the original position.
[0028] As an alternative, the driving of the wire cutting driving mechanism can also be replaced by the cylinder described in the above embodiment in the following way: a driving shaft connected with a motor is rotatably connected in the housing of the sewing machine, and a driving gear is fixedly connected on the driving shaft; a retaining sleeve is fixed on one side of the driving shaft in the housing, and a cam is rotatably connected in the retaining sleeve; the outer wall of the cam has a gear meshing with the driving gear; a driving arm abutting against the outer edge of the cam and connected with the driving pin 141 is hingedly connected to the retaining sleeve; the driving arm is hingedly connected to the retaining sleeve through the middle part, abuts against the outer edge of the cam at one end, and is fixedly connected with one end of a tension spring fixed in the housing; under the elastic action of the tension spring, the end of the driving arm in contact with the retaining sleeve is always in abutting state; during operation, the driving shaft, the driving gear and the cam are sequentially driven, the one end of the driving arm is pushed to rotate around the hinge by the outer edge of the cam, so that the other end of the driving arm pushes the driving pin 141 forward, and when the driving shaft reverses, the driving arm pulls the driving pin 141 backward, thereby completing the transmission.
[0029] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.
[0030] Although the terms of the blade plate 1, the line hook 11, the connecting pin 111, the main body 112, the connecting part 13, the guide pin 1131, the sliding hole 12, the swing arm one 13, the strip hole one 131, the strip hole two 132, the swing arm two 14, the driving pin 141, the transmission pin 142, the fixed hole 143, the connecting hole 144, the fixed shaft one 15, the fixed shaft two 16, the torsional spring 161 and the like are used more in the text, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; it is contrary to the spirit of the utility model to interpret them as any kind of additional limitation.
Claims
1. A thread trimming drive structure of a sewing machine, the sewing machine comprising a presser foot (1) having a thread hook (11) on a top surface, a slide hole (12) in the form of a long strip being formed in the presser foot (1), and a connecting pin (111) being fixed to the thread hook (11) and being slidably connected in the slide hole (12), characterized in that, The line cutting driving structure comprises a swing arm one (13) and a swing arm two (14) hinged on the bottom surface of the cutter plate (1), a strip-shaped hole one (131) is formed on the swing end of the swing arm one (13), the connecting pin (111) is slidably connected in the strip-shaped hole one (131), the driving pin (141) for connecting with the air cylinder is fixedly connected on the swing arm two (14), and the swing arm two (14) is connected with the swing arm one (13) and can drive the swing arm one (13) to rotate around the hinge.
2. The thread trimming drive structure of the sewing machine according to claim 1, characterized by, A strip-shaped hole two (132) with the same length as the strip-shaped hole one (131) is formed on the swing arm one (13) between the rotating end and the swing end, the swing end of the swing arm two (14) is fixedly provided with a transmission pin (142), and the transmission pin (142) is slidably connected in the strip-shaped hole two (132).
3. The thread trimming drive structure of the sewing machine according to claim 1 or 2, characterized in that, A fixed hole (143) is formed on the swing arm two (14) between the rotating end and the swing end, and the driving pin (141) is fixed in the fixed hole (143).
4. The thread trimming drive structure of the sewing machine according to claim 3, wherein The bottom of the cutter plate (1) is fixedly provided with a fixed shaft one (15) and a fixed shaft two (16) oppositely arranged on both sides of the sliding hole (12), the rotating end of the swing arm one (13) is rotatably connected with the fixed shaft one (15), and the rotating end of the swing arm two (14) is rotatably connected with the fixed shaft two (16).
5. The thread trimming drive structure of the sewing machine according to claim 4, wherein A torsional spring (161) with one end fixed is sleeved on the fixed shaft two (16) above the swing arm two (14), a connecting hole (144) is formed on the swing arm two (14) between the fixed hole (143) and the rotating end, and the other end of the torsional spring (161) is clamped in the connecting hole (144).
6. The thread trimming drive structure of the sewing machine according to claim 3, wherein The line hook (11) comprises a long strip-shaped main body (112) and a plate-shaped connecting part (113) formed on one side of the main body (112), the connecting pin (111) is fixed on the connecting part (113), the connecting part (113) is further fixed with a guide pin (1131) slidably connected in the sliding hole (12), and the guide pin (1131) and the connecting pin (111) are arranged in the length direction of the main body (112).