Sewing machine with anti-winding structure

Abstract

The utility model discloses a sewing machine with an anti-winding structure, which comprises a universal wheel mounted at the bottom of the sewing machine, the universal wheel comprises a mounting seat, the bottom of the mounting seat is rotatably connected with a universal rotating shaft, the bottom of the universal rotating shaft is rotatably connected with a protective plate, the lower part of the protective plate is rotatably connected with a driving shaft, and the driving shaft is rotatably connected with the bottom of the universal rotating shaft. The sewing machine with the anti-winding structure is characterized in that a driving shaft is arranged on the driving shaft, a walking wheel is installed on the driving shaft, cutting knives are arranged on the front side and the rear side of the walking wheel in the advancing direction, and vertical rods are fixedly connected to the front side and the rear side of the protection plate. The thread residue which may be wound is automatically cut in the moving process of the sewing machine, so that the problem that the thread residue is wound on the moving mechanism is effectively prevented, an operator does not need to perform any additional operation in the whole process, and the sewing machine is very convenient and practical.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically a sewing machine with an anti-tangle structure. Background Technology

[0002] A sewing machine typically consists of a sewing machine base, a sewing machine head connected to the sewing machine base, and a drive mechanism. The sewing machine head is equipped with a needle bar and a selector bar. The needle bar holds the sewing needle. The drive mechanism drives the sewing needle to move up and down while simultaneously driving the selector bar to swing up and down at high speed. The swinging of the selector bar drives the sewing thread to move up and down reciprocally, thus supplying and retrieving the sewing thread. This tightens the stitch formed by the top and bottom threads and extracts the amount of thread needed for one stitch from the thread tube.

[0003] Chinese Patent Publication No. CN 213681217 U discloses a sewing machine with an anti-tangle structure, including a worktable. The sewing machine body is mounted on the top of the worktable, and a support plate is mounted on the bottom of the worktable. An adjustment mechanism is mounted on the support plate and on the side closest to the worktable. In this invention, the worktable and support plate are connected and fixed by the adjustment mechanism. During use, the sewing machine can be easily moved by the moving mechanism at the bottom of the support plate. This saves time and manpower when handling or transporting the machine, reduces the labor intensity of the handlers, and brings great convenience to the user.

[0004] However, the aforementioned patent still has some shortcomings. Existing conventional sewing machines all add similar moving mechanisms, but because thread ends often appear in the working environment, the thread ends will get tangled on the moving mechanism when moving, causing difficulty in moving. Utility Model Content

[0005] To address the shortcomings mentioned in the background art, the purpose of this utility model is to provide a sewing machine with an anti-tangling structure. By designing a traveling wheel with a cutting blade and an extension blade, as well as an eccentric wheel and spring that cooperate with it, the machine automatically cuts any thread ends that may become tangled during movement, thereby effectively preventing the problem of thread ends getting tangled in the moving mechanism. Throughout the process, the operator does not need to perform any additional operations, making it very convenient and practical.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A sewing machine with an anti-tangle structure includes a caster wheel mounted on the bottom of the sewing machine. The caster wheel includes a mounting base, a universal shaft rotatably connected to the bottom of the mounting base, a guard plate rotatably connected to the bottom of the universal shaft, a drive shaft rotatably connected below the guard plate, a traveling wheel mounted on the drive shaft, and cutting blades provided on both the front and rear sides of the traveling wheel in its direction of travel. Vertical rods are fixedly connected to both the front and rear sides of the guard plate, and a connecting rod is provided between the vertical rod and the cutting blades. An extension blade is provided below the connecting rod. The traveling wheel is equipped with both the cutting blade and the extension blade; when the traveling wheel rolls, the cutting blade can cut off any thread ends that may be tangled on the traveling wheel.

[0008] More preferably, both the bottom end of the cutting blade and the bottom end of the extension blade are serrated. This design increases the cutting capability of the cutting blade, making cutting faster and more effective. The cutting blade and the extension blade form a cutting assembly, the shape of which is adapted to the contour of the wheel. This design allows the extension blade to further assist the cutting blade in cutting when the wheel encounters a large thread or tangled thread, thereby more effectively preventing thread tangling. Simultaneously, the shape of the cutting assembly, composed of the cutting blade and the extension blade, is adapted to the contour of the wheel to ensure that the cutting assembly can fully contact and cut any potentially tangled thread as the wheel rolls.

[0009] More preferably, the connecting rod is provided with a longitudinal sliding ring, the longitudinal sliding ring is sleeved on the vertical rod, and the inner side of the longitudinal sliding ring is in contact with the outer side of the vertical rod.

[0010] More preferably, an eccentric wheel is fixedly connected to the drive shaft, and a trigger block is fixedly connected to the bottom end of the longitudinal sliding ring. The eccentric wheel and the trigger block are in contact with each other. When the eccentric wheel rotates, it drives the longitudinal sliding ring to move up and down along the vertical rod through its contact connection with the longitudinal sliding ring, thereby driving the connecting rod and the cutting blade to rise and fall. This design allows the cutting blade to automatically descend and cut when the traveling wheel encounters a thread end.

[0011] More preferably, a baffle is fixedly connected to the top of the vertical rod, and a spring is sleeved on the vertical rod, with the spring located between the baffle and the longitudinal sliding ring. The presence of the spring ensures that the longitudinal sliding ring rises and falls smoothly under the drive of the eccentric wheel, while preventing the cutting blade position from shifting due to external forces.

[0012] More preferably, a protective shell is fixedly connected to the guard plate, and the eccentric wheel and the vertical rod are both located inside the protective shell. This design not only prevents dust and debris from entering the drive mechanism, but also prevents wire ends from getting tangled on the eccentric wheel.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model, by designing a traveling wheel with a cutting blade and an extension blade, as well as an eccentric wheel and a spring that work together with it, realizes the automatic cutting of thread ends that may get tangled during the movement of the sewing machine, thereby effectively preventing the problem of thread ends getting tangled in the moving mechanism. Throughout the process, the operator does not need to perform any additional operations, which is very convenient and practical. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of this utility model;

[0018] Figure 3 This is a partial structural schematic diagram from another perspective of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of this utility model.

[0020] In the picture:

[0021] 1. Mounting base; 2. Universal swivel shaft; 3. Protective plate; 4. Drive shaft; 5. Traveling wheel; 6. Cutting blade; 7. Vertical rod; 8. Connecting rod; 9. Extension blade; 10. Longitudinal sliding ring; 11. Eccentric wheel; 12. Trigger block; 13. Baffle; 14. Spring; 15. Protective shell. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] like Figure 1-4As shown, a sewing machine with an anti-tangle structure includes a caster wheel mounted on the bottom of the sewing machine. The caster wheel includes a mounting base 1, a universal shaft 2 rotatably connected to the bottom of the mounting base 1, a guard plate 3 rotatably connected to the bottom of the universal shaft 2, a drive shaft 4 rotatably connected to the lower part of the guard plate 3, a traveling wheel 5 mounted on the drive shaft 4, and cutting blades 6 provided on both the front and rear sides of the traveling wheel 5 in the direction of travel. Vertical rods 7 are fixedly connected to both the front and rear sides of the guard plate 3, and a connecting rod 8 is provided between the vertical rod 7 and the cutting blades 6. An extension blade 9 is provided below the connecting rod 8. The traveling wheel 5 is equipped with cutting blades 6 and extension blades 9. When the traveling wheel 5 rolls, the cutting blades 6 can cut off any thread ends that may be tangled on the traveling wheel 5.

[0025] The bottom ends of both the cutting blade 6 and the extension blade 9 are serrated. This design increases the cutting capability of the cutting blade 6, making cutting faster and more effective. The cutting blade 6 and the extension blade 9 form a cutting assembly, the shape of which is adapted to the contour of the traveling wheel 5. This design allows the extension blade 9 to further assist the cutting blade 6 in cutting when the traveling wheel 5 encounters a large thread end or tangled thread, thereby more effectively preventing thread tangling. Simultaneously, the shape of the cutting assembly formed by the cutting blade 6 and the extension blade 9 is adapted to the contour of the traveling wheel 5 to ensure that the cutting assembly can fully contact and cut any potentially tangled thread ends as the traveling wheel 5 rolls.

[0026] A longitudinal sliding ring 10 is provided on the connecting rod 8. The longitudinal sliding ring 10 is sleeved on the vertical rod 7, and the inner side of the longitudinal sliding ring 10 is in contact with the outer side of the vertical rod 7.

[0027] An eccentric wheel 11 is fixedly connected to the drive shaft 4, and a trigger block 12 is fixedly connected to the bottom end of the longitudinal sliding ring 10. The eccentric wheel 11 and the trigger block 12 are in contact with each other. When the eccentric wheel 11 rotates, it drives the longitudinal sliding ring 10 to move up and down along the vertical rod 7 through its contact connection with the longitudinal sliding ring 10, thereby driving the connecting rod 8 and the cutting blade 6 to rise and fall. This design allows the cutting blade 6 to automatically descend and cut when the traveling wheel 5 encounters a thread end.

[0028] A baffle 13 is fixedly connected to the top of the vertical rod 7, and a spring 14 is sleeved on the vertical rod 7. The spring 14 is located between the baffle 13 and the longitudinal sliding ring 10. The presence of the spring 14 ensures that the longitudinal sliding ring 10 rises and falls smoothly under the drive of the eccentric wheel 11, while preventing the cutting blade 6 from shifting position due to external force.

[0029] A protective shell 15 is fixedly connected to the guard plate 3, and the eccentric wheel 11 and the vertical rod 7 are both located inside the protective shell 15. This design not only prevents dust and debris from entering the drive mechanism, but also prevents wire ends from getting tangled on the eccentric wheel 11.

[0030] Working principle:

[0031] Using this device, the sewing machine is moved simply by controlling the rolling of the traveling wheel 5, just like a conventional sewing machine. When the traveling wheel 5 encounters a thread end during its rolling, the eccentric wheel 11, through its contact with the longitudinal sliding ring 10, drives the longitudinal sliding ring 10 to move downwards along the vertical rod 7. The downward movement of the longitudinal sliding ring 10 causes the connecting rod 8 and the cutting blade 6 to descend, while the spring 14 is compressed. After the cutting blade 6 and the extension blade 9 descend to a certain position, they begin to cut the thread end wrapped around the traveling wheel 5. After the traveling wheel 5 rolls past the thread end, the eccentric wheel 11 continues to rotate, but due to the elastic force of the spring 14, the longitudinal sliding ring 10 begins to move upwards along the vertical rod 7. The upward movement of the longitudinal sliding ring 10 causes the connecting rod 8 and the cutting blade 6 to rise, and the cutting blade 6 and the extension blade 9 return to their initial positions, thus enabling the cutting blade 6 to automatically descend and cut. Throughout the entire process, the operator does not need to perform any additional operations, making it very convenient and practical.

[0032] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A sewing machine with a thread entanglement preventing structure, characterized by comprising: The universal wheel is installed on the bottom of the sewing machine, the universal wheel comprises a mounting seat (1), the bottom of the mounting seat (1) is rotationally connected with a universal rotating shaft (2), the bottom of the universal rotating shaft (2) is rotationally connected with a guard plate (3), the lower portion of the guard plate (3) is rotationally connected with a driving shaft (4), the driving shaft (4) is installed with a traveling wheel (5), the front and rear sides of the traveling direction of the traveling wheel (5) are provided with cutting knives (6), the front and rear sides of the guard plate (3) are fixedly connected with vertical rods (7), the vertical rods (7) and the cutting knives (6) are provided with connecting rods (8), and the lower portion of the connecting rods (8) is provided with extension knives (9).

2. The sewing machine with an anti-thread winding structure according to claim 1, characterized in that, The bottom end of the cutting knife (6) is serrated, the bottom end of the extension knife (9) is serrated, the cutting knife (6) and the extension knife (9) form a cutting assembly, and the shape of the cutting assembly is adapted to the contour of the traveling wheel (5).

3. The sewing machine with an anti-thread winding structure according to claim 1, characterized in that, The connecting rod (8) is provided with a longitudinal sliding ring (10), the longitudinal sliding ring (10) is sleeved on the vertical rod (7), and the inner side surface of the longitudinal sliding ring (10) is attached to the outer side surface of the vertical rod (7).

4. The sewing machine with an anti-thread winding structure according to claim 3, characterized in that, The driving shaft (4) is fixedly connected with an eccentric wheel (11), the bottom end of the longitudinal sliding ring (10) is fixedly connected with a trigger block (12), the eccentric wheel (11) is in abutting connection with the trigger block (12), the guard plate (3) is fixedly connected with a protection shell (15), and the eccentric wheel (11) and the vertical rod (7) are located in the protection shell (15).

5. The sewing machine with an anti-thread winding structure according to claim 3, characterized in that, The top end of the vertical rod (7) is fixedly connected with a baffle (13), the vertical rod (7) is sleeved with a spring (14), and the spring (14) is located between the baffle (13) and the longitudinal sliding ring (10).

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