Sewing machine thread trimming device for processing cylindrical textiles

Abstract

The utility model discloses a thread trimming device of a sewing machine for processing cylindrical textiles. The thread trimming device comprises a driving device, a lower shaft, a pull rod crank, a first mounting frame shaft sleeve, a first cutter, a first swing rod, a second mounting frame shaft sleeve, a second cutter and a second swing rod, the pull rod crank is sleeved on the driving device and is respectively hinged with the first swing rod and the second swing rod; one end of the first mounting frame shaft sleeve is fixedly connected with the first cutter, and the other end of the first mounting frame shaft sleeve is rotationally connected with the other end of the first swing rod; one end of the second mounting frame shaft sleeve is fixedly connected with the second cutter, and the other end of the second mounting frame shaft sleeve is rotationally connected with the other end of the second swing rod; the driving device drives the pull rod crank to rotate, the first swing rod drives the first installation shaft sleeve, the second swing rod drives the second installation shaft sleeve to rotate in the opposite directions, and meshing or separation of the two cutters is achieved. The driving device and the cutter are separated, a containing space is provided for sewn fabric, and meanwhile the problem that threads are prone to loosing after being trimmed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing, and particularly relates to a thread cutting device for tubular textiles. Background Art

[0002] In traditional automatic sewing machines, an automatic thread cutting device is an important auxiliary component. It mainly drives one or two groups of cutters to rotate and engage through a driving device to achieve the function of automatic thread cutting, thereby reducing manual operation and improving production efficiency. However, existing thread cutting devices usually have certain limitations, especially when dealing with tubular products with a certain depth and small structure. For example, when a sewing machine needs to process tubular products such as sleeves and bucket-shaped bags, due to its small and compact structure and the close distance between the driving device and the cutter, the traditional thread cutting device cannot reserve sufficient placement space for these products, resulting in the inability to process and cut threads at deeper positions. Summary of the Invention

[0003] The utility model aims to provide an automatic thread cutting device with a wider application range and higher efficiency in view of the deficiencies of existing patent solutions. By optimizing the distance between the driving device and the cutter, this patent can adapt to products of various shapes and sizes. Especially when dealing with tubular products, it has a larger placement space and a deeper processing position. The specific solutions are as follows:

[0004] A thread cutting device for a sewing machine for processing tubular textiles, comprising a driving device, a lower shaft, a pull rod crank, a first mounting bracket bushing, a first cutter, a first swing rod, a second mounting bracket bushing, a second cutter, and a second swing rod; the pull rod crank is sleeved on the driving device and is linked with it; one ends of the first swing rod and the second swing rod are respectively hinged to the pull rod crank; the first mounting bracket bushing is rotatably sleeved on the lower shaft, one end is fixedly connected to the first cutter, and the other end is rotatably connected to the other end of the first swing rod; the second mounting bracket bushing is rotatably sleeved on the first mounting bracket bushing, one end is fixedly connected to the second cutter, and the other end is rotatably connected to the other end of the second swing rod;

[0005] The driving device drives the pull rod crank to rotate. Subsequently, the first swing rod drives the first mounting shaft sleeve, and the second swing rod drives the second mounting shaft sleeve to rotate in opposite directions, realizing the engagement or separation of the first cutter and the second cutter.

[0006] Preferably, the driving device is a motor.

[0007] Preferably, it further includes a first rotating shaft sleeve; the first rotating shaft sleeve is fixed on the other end of the first mounting bracket bushing, and the other end of the first swing rod is rotatably connected to the first rotating shaft sleeve.

[0008] Preferably, the first rotating shaft sleeve has an adjustable opening, and the inner diameter of the first rotating shaft sleeve is adjusted by adjusting the size of the adjustable opening.

[0009] Preferably, it further includes a second rotating shaft sleeve; the second rotating shaft sleeve is fixed to the other end of the second mounting frame shaft sleeve, and the other end of the second swing rod is rotatably connected to the second rotating shaft sleeve.

[0010] Preferably, the second rotating shaft sleeve has an adjustable opening, and the inner diameter of the second rotating shaft sleeve is adjusted by adjusting the size of the adjustable opening.

[0011] Preferably, it further includes a first tool ring, the first tool is installed on the first tool ring, and the first tool ring is sleeved on the first mounting frame shaft sleeve.

[0012] Preferably, a second tool ring portion is provided on the second mounting frame shaft sleeve, and the second tool is installed on the second tool ring portion.

[0013] Preferably, a bearing is embedded in the first mounting frame shaft sleeve, and the first mounting frame shaft sleeve is rotatably connected to the lower shaft through the bearing; a bearing is embedded in the second mounting frame shaft sleeve, and the second mounting frame shaft sleeve is rotatably connected to the first mounting frame shaft sleeve through the bearing.

[0014] Preferably, the distance from the position where the pull rod crank is connected to the driving device to the first swing rod is greater than the distance from it to the second swing rod.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The driving device and the tool are separated by the first mounting frame shaft sleeve and the second mounting frame shaft sleeve. When the sewing part moves longitudinally into the cylindrical structure, the long and narrow second mounting frame shaft sleeve can provide a suitable accommodation space for the sewn fabric, avoiding fabric accumulation and providing good conditions for the flatness of the fabric at the sewing part. The lower shaft, the first mounting frame shaft sleeve and the second mounting frame shaft sleeve are rotatably connected through bearings. The bearings can provide stable support for the rotation among the three, reducing the friction coefficient. The distance from the position where the pull rod crank is connected to the driving device to the first swing rod is greater than the distance from it to the second swing rod, so that the rotation amplitudes of the first tool and the second tool are different, and the position where the two tools bite and contact deviates from directly below the sewing machine needle, solving the problem that the needle is likely to be thread-off after cutting in the prior art with double cutting knives and making the thread cutting more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of an embodiment of the present utility model;

[0018] Figure 2It is an enlarged view of part A of the embodiment of the present utility model;

[0019] Figure 3 It is a schematic installation diagram of the first swing rod and the second swing rod of the embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram of the movement directions of the first swing rod and the second swing rod of the embodiment of the present utility model;

[0021] Figure 5 It is a schematic installation structure diagram of the first tool of the embodiment of the present utility model;

[0022] Figure 6 It is a schematic installation structure diagram of the second tool of the embodiment of the present utility model;

[0023] Figure 7 It is a side view of the embodiment of the present utility model;

[0024] Figure 8 It is a sectional view taken along the line B-B of the embodiment of the present utility model. Specific embodiments

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0027] Refer to the attached drawings of the specification Figure 1-8, an embodiment of the present utility model provides a thread cutting device for a sewing machine for processing cylindrical textiles, including a driving device, a lower shaft 2, a pull rod crank 3, a first mounting bracket bushing 4, a first cutter 5, a first swing rod 6, a second mounting bracket bushing 7, a second cutter 8 and a second swing rod 9; the pull rod crank 3 is sleeved on the driving device and is linked with it; one ends of the first swing rod 6 and the second swing rod 9 are respectively hinged to the pull rod crank 3; the first mounting bracket bushing 4 is rotatably sleeved on the lower shaft 2, one end is fixedly connected to the first cutter 5, and the other end is rotatably connected to the other end of the first swing rod 6; the second mounting bracket bushing 7 is rotatably sleeved on the first mounting bracket bushing 4, one end is fixedly connected to the second cutter 8, and the other end is rotatably connected to the other end of the second swing rod 9; a computerized sewing machine rotary hook 11 is installed at one end of the lower shaft 2 close to the first cutter 5 and the second cutter 8; the needle of the sewing machine (not shown in the figure) hangs directly above the computerized sewing machine rotary hook 11, and the first cutter 5 and the second cutter 8 surround the left and right outer sides of the computerized sewing machine rotary hook 11 and are lower than the needle tip in the reset state.

[0028] The driving device drives the pull rod crank 3 to rotate. Subsequently, the first swing rod 6 drives the first mounting shaft sleeve 4, and the second swing rod 9 drives the second mounting shaft sleeve 7 to rotate in opposite directions, realizing the biting or separation of the first cutter 5 and the second cutter 8.

[0029] Further, the driving device is a stepper motor 1 or other motors with equivalent functions. The stepper motor 1 performs forward and reverse rotations to realize the biting or separation of the first cutter 5 and the second cutter 8.

[0030] Further, the first swing rod 6 can be directly hinged to the first mounting bracket bushing 4. However, for the flexible generalization and replacement of spare parts, a first rotating shaft sleeve 12 is provided in this embodiment; the first rotating shaft sleeve 12 is fixed to the other end of the first mounting bracket bushing 4, and the other end of the first swing rod 6 is hinged to the first rotating shaft sleeve 12.

[0031] Similarly, the second swing rod 9 can be directly hinged to the second mounting bracket bushing 7. However, for the flexible generalization and replacement of spare parts, a second rotating shaft sleeve 13 is provided in this embodiment; the second rotating shaft sleeve 13 is fixed to the other end of the second mounting bracket bushing 7, and the other end of the second swing rod 9 is hinged to the second rotating shaft sleeve 13.

[0032] As shown in the instruction manual appendix Figure 4As shown, when the stepper motor 1 drives the pull rod crank 3 to rotate counterclockwise, the second swing rod 9 rotates counterclockwise accordingly. The second rotating sleeve 13 drives the second mounting frame sleeve 7 and the second tool 8 to rotate counterclockwise and move toward the middle; the first swing rod 6 rotates clockwise, and the first rotating sleeve 12 drives the first mounting frame sleeve 4 and the first tool 5 to rotate clockwise and move toward the middle; the two realize bite line cutting. After line cutting, the stepper motor 1 drives the pull rod crank 3 to rotate clockwise, and the second swing rod 9 rotates clockwise accordingly. The second rotating sleeve 13 drives the second mounting frame sleeve 7 and the second tool 8 to rotate clockwise and withdraw from the outside; the first swing rod 6 rotates counterclockwise, and the first rotating sleeve 12 drives the first mounting frame sleeve 4 and the first tool 5 to rotate counterclockwise and withdraw from the outside; the two realize separate reset.

[0033] During the sewing and embroidery process of the cylindrical textile, its cylindrical structure needs to be mounted on the outside of the computerized shuttle 11, the first cutter 5 and the second cutter 8. When the sewing area is displaced toward the depth of the cylindrical structure, the narrow second mounting frame sleeve 7 can provide a suitable accommodation space for the finished sewing fabric. Compared with the existing sewing machines, the distance between the first cutter, the second cutter and the drive device is too close, resulting in insufficient accommodation space for the finished sewing cylindrical structure, which can only be piled up between the cutter and the sewing machine. Moreover, the cylindrical structure cannot also accommodate the drive device. The accumulation of fabrics causes deformation, which cannot provide good conditions for the flatness of the sewing area, but increases the difficulty of sewing and thread cutting. Therefore, this type of sewing machine is only suitable for flat fabrics.

[0034] Furthermore, in order to cope with tubular textiles of different depths, the length and aperture of the first mounting frame sleeve 4 and the second mounting frame sleeve 7 will also be adjusted accordingly. Therefore, in this embodiment, the first rotating sleeve 12 is provided with an adjustable opening 120, the size of which can be adjusted by adjusting the screw, and then the inner diameter thereof can be adjusted so that it can be adapted to the first mounting frame sleeve of other sizes. Similarly, the second rotating sleeve 13 also has an adjustable opening 130, the size of which can be adjusted by adjusting the screw, and then the inner diameter thereof can be adjusted so that it can be adapted to the second mounting frame sleeve of other sizes.

[0035] Furthermore, it also includes a first cutter ring 50, the first cutter 5 is mounted on the first cutter ring 50, and the first cutter ring 50 is sleeved on the first mounting frame sleeve 4. The tip of the first cutter 5 is located on the left side below the sewing needle. The second mounting frame sleeve 7 is provided with a second cutter ring portion 70, and the second cutter 8 is mounted on the second cutter ring portion 70. The tip of the second cutter 8 is located on the right side below the sewing needle.

[0036] Further, a bearing 10'' is embedded in the first mounting bracket bushing 4, and the first mounting bracket bushing 4 is rotatably connected to the lower shaft 2 through the bearing 10''; a bearing 10' is embedded in the second mounting bracket 7 bushing, and the second mounting bracket 7 bushing is rotatably connected to the first mounting bracket bushing 4 through the bearing 10', providing stable support for the rotation of the first mounting bracket bushing 4 and the second mounting bracket bushing 7 and reducing the friction coefficient. Further, a bearing 10 is also sleeved outside the second mounting bracket bushing 7.

[0037] Further, the distance from the position where the pull rod crank 3 is connected to the driving device to the first swing rod 6 is greater than the distance from the position to the second swing rod 9, so that the rotation amplitudes of the first cutter 5 and the second cutter 8 are different, and the position where the two cutters are in biting contact deviates from directly below the sewing machine needle, solving the problem that the needle is likely to be disengaged from the thread after cutting by the double cutters in the prior art and making the thread cutting more stable.

[0038] For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all such changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A thread trimming device for a sewing machine for processing tubular textiles, characterized in that: It includes a driving device, a lower shaft, a pull rod crank, a first mounting frame sleeve, a first tool, a first swing rod, a second mounting frame sleeve, a second tool and a second swing rod; the pull rod crank is sleeved on the driving device and linked therewith; one end of the first swing rod and the second swing rod are respectively hinged to the pull rod crank; the first mounting frame sleeve is rotatably sleeved on the lower shaft, one end of which is fixedly connected to the first tool, and the other end is rotatably connected to the other end of the first swing rod; the second mounting frame sleeve is rotatably sleeved on the first mounting frame sleeve, one end of which is fixedly connected to the second tool, and the other end is rotatably connected to the other end of the second swing rod; The driving device drives the pull rod crank to rotate, and then the first swing rod drives the first mounting sleeve and the second swing rod drives the second mounting sleeve to rotate in opposite directions, so that the first tool and the second tool are engaged or separated.

2. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: The driving device is a motor.

3. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: It also includes a first rotating sleeve; the first rotating sleeve is fixed to the other end of the first mounting frame sleeve, and the other end of the first swing rod is rotatably connected to the first rotating sleeve.

4. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 3, characterized in that: The first rotating sleeve has an adjustable opening, and the inner diameter of the first rotating sleeve is adjusted by adjusting the size of the adjustable opening.

5. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: It also includes a second rotating sleeve; the second rotating sleeve is fixed to the other end of the second mounting frame sleeve, and the other end of the second swing rod is rotatably connected to the second rotating sleeve.

6. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 5, characterized in that: The second rotating sleeve has an adjustable opening, and the inner diameter of the second rotating sleeve is adjusted by adjusting the size of the adjustable opening.

7. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: It also includes a first tool ring, the first tool is mounted on the first tool ring, and the first tool ring is sleeved on the first mounting bracket sleeve.

8. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: The second mounting frame sleeve is provided with a second tool ring portion, and the second tool is mounted on the second tool ring portion.

9. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: A bearing is embedded in the first mounting frame sleeve, and the first mounting frame sleeve is rotatably connected to the lower shaft through the bearing; a bearing is embedded in the second mounting frame sleeve, and the second mounting frame sleeve is rotatably connected to the first mounting frame sleeve through the bearing.

10. A thread trimming device for a sewing machine for processing tubular textiles as claimed in claim 1, characterized in that: The distance from the position where the pull rod crank is connected to the driving device to the first swing rod is greater than the distance from the position where the pull rod crank is connected to the driving device to the second swing rod.

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