CN112064221B - Thread cutting system of sewing machine and sewing method - Google Patents
Thread cutting system of sewing machine and sewing method Download PDFInfo
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- CN112064221B CN112064221B CN202011063789.7A CN202011063789A CN112064221B CN 112064221 B CN112064221 B CN 112064221B CN 202011063789 A CN202011063789 A CN 202011063789A CN 112064221 B CN112064221 B CN 112064221B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
- D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
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Abstract
The invention discloses a thread trimming system of a sewing machine and a sewing method. The thread trimming system of the sewing machine comprises: the thread trimming component comprises a fixed cutter and a movable cutter which is rotatably connected with the fixed cutter; the thread cutting movable cutter driving device is connected with the movable cutter and is used for driving the movable cutter to move so that the movable cutter and the fixed cutter are matched for thread cutting and thread clamping; the thread trimming moving knife is rotatably connected to the sewing machine shell, the thread trimming component is connected to the thread trimming moving knife through the transmission mechanism, and when the thread trimming moving knife rotates towards the preset thread trimming position, the transmission mechanism drives the thread trimming component to be far away from the preset thread trimming position. Based on the arrangement of the thread trimming component, the upper thread end remained on the bottom surface of the cloth can be shortened when the seam is started, and the bird nest phenomenon caused by the fact that the thread end is wound in the stitch can be effectively solved. The thread trimming component is of a trimming and clamping integrated structure, and can prevent the problem of thread trimming and thread shedding during sewing. The scissors assembly and the end trimming are linked to avoid the position, and the scissors assembly can be completely prevented from being touched when the trimming of the trimming moving knife is finished in a mechanical mode.
Description
Technical Field
The invention relates to the technical field of sewing, in particular to a thread cutting system and a sewing method of a sewing machine.
Background
In the current pattern sewing machine, a certain length of upper thread end is generally remained on the needle raising part on the back of the sewing cloth, which may be rolled into the bottom thread stitch to form a bird nest-shaped thread ball. The existence of the bird nest phenomenon can influence the attractiveness of the stitches of the bottom thread of the sewn cloth, and the manual treatment of the bird nest is time-consuming and high in economic cost.
Therefore, how to reduce the occurrence of bird nests is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a thread trimming system for a sewing machine, which can reduce the occurrence of bird nests. Another object of the present invention is to provide a sewing method using the thread trimming system of the sewing machine, which can reduce the occurrence of bird's nests.
In order to achieve the purpose, the invention provides the following technical scheme:
a sewing machine thread trimming system comprising:
the thread trimming component comprises a fixed cutter and a movable cutter which is rotatably connected with the fixed cutter;
the thread cutting movable knife driving device is connected with the movable knife and used for driving the movable knife to move so that the movable knife and the fixed knife are matched for thread cutting and thread clamping;
the thread trimming component is connected with the thread trimming movable cutter in a rotating mode at the end of the sewing machine shell, the thread trimming component is connected with the thread trimming movable cutter through a transmission mechanism, so that the thread trimming movable cutter is driven by the transmission mechanism to move towards the preset thread trimming position when rotating, and the thread trimming component is far away from the preset thread trimming position.
Preferably, the stationary knife is slidably attached to the sewing machine housing.
Preferably, the thread cutting moving blade driving device comprises a rotary driver and a moving blade driving plate connected to the output end of the rotary driver, and the moving blade driving plate is connected to the moving blade in a sliding manner; and in the process that the transmission mechanism drives the thread trimming assembly to slide away from the preset thread trimming position, the movable cutter slides relative to the movable cutter driving plate so that the movable cutter driving plate keeps static.
Preferably, the thread cutting moving blade driving device further comprises a moving blade driving block fixedly connected to an output shaft of the rotary driver, a driving pin is fixedly arranged on the moving blade driving block, and a driving groove is formed in the moving blade driving block; the driving pin is inserted into the driving groove in a sliding mode, and the driving groove can rotate relative to the driving pin; the movable knife driving plate is connected with the sewing machine shell in a sliding mode, and the sliding direction of the movable knife driving plate is a straight line.
Preferably, the transmission mechanism comprises a thread trimming crank, a driving connecting plate fixed on the thread trimming crank, a first connecting rod mechanism connected between the driving connecting plate and the movable cutter for finishing thread trimming, and a second connecting rod mechanism connected between the driving connecting plate and the fixed cutter.
Preferably, the first link mechanism comprises a thread trimming moving knife connecting rod, and two ends of the thread trimming moving knife connecting rod are respectively and rotatably connected to the driving connecting plate and the thread trimming moving knife.
Preferably, the second link mechanism comprises a fixed cutter connecting plate and a driving link; the middle part of the fixed knife connecting plate is rotatably connected to the sewing machine shell, one end of the fixed knife connecting plate is rotatably connected to one end of the driving connecting rod, the other end of the fixed knife connecting plate is provided with a fixed knife sliding groove, the fixed knife is fixedly connected with a bolt, the bolt is slidably connected into the fixed knife sliding groove, and the fixed knife sliding groove can rotate relative to the bolt; the other end of the driving connecting rod is rotatably connected to the driving connecting plate.
Preferably, the fixed knife is fixed on a sliding block, a pressing strip is fixedly arranged on the sewing machine shell to form a sliding way, and the sliding block is inserted in the sliding way in a sliding manner; the bolt is fixed on the sliding block.
Preferably, the thread trimming assembly further comprises a thread pressing blade fixed on the fixed knife, and the movable knife is arranged between the fixed knife and the thread pressing blade.
A sewing method using the sewing machine thread trimming system as described above, the sewing method comprising:
after a first needle of the needle raising device sends the upper thread end to the lower part of the cloth, the thread cutting movable cutter driving device is controlled to drive the movable cutter to move, so that the movable cutter and the fixed cutter are matched to cut off the upper thread end and clamp the upper thread;
closely sewing the cloth with a preset needle number at a needle pitch smaller than the preset needle pitch;
when the next needle with the preset needle number is sewn and the needle leaves the needle plate hole, the thread cutting movable cutter driving device is controlled to drive the movable cutter to move, so that the movable cutter and the fixed cutter loosen the upper thread.
The invention provides a thread trimming system of a sewing machine, comprising: the thread trimming component comprises a fixed cutter and a movable cutter which is rotatably connected with the fixed cutter; the thread cutting movable cutter driving device is connected with the movable cutter and is used for driving the movable cutter to move so that the movable cutter and the fixed cutter are matched for thread cutting and thread clamping; the thread trimming moving knife is rotatably connected to the sewing machine shell, the thread trimming component is connected to the thread trimming moving knife through the transmission mechanism, and when the thread trimming moving knife rotates towards the preset thread trimming position, the transmission mechanism drives the thread trimming component to be far away from the preset thread trimming position.
The thread cutting assembly is additionally arranged in the thread cutting system of the sewing machine, after a first needle of a lifting needle sends the thread end of the upper thread to the lower side of the cloth, the thread cutting movable cutter driving device can be controlled to drive the movable cutter to move, so that the movable cutter and the fixed cutter are matched to cut off the thread end of the upper thread, and then the subsequent sewing operation is carried out. Because the upper thread end remained on the bottom surface of the cloth can be shortened during the starting sewing, no knot is formed between the bottom thread and the upper thread end, and the bird nest phenomenon caused by the fact that the thread end is wound in the stitch can be effectively solved. The thread trimming component is of a trimming and clamping integrated structure, so that the problem of seam starting and thread falling can be solved while the problem of bird nests is solved. In addition, the scissors assembly and the end trimming are linked to avoid the position, so that the phenomenon that the trimming assembly is touched when the trimming of the trimming moving knife is finished can be completely avoided in a mechanical mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a structural view of a sewing machine to which a thread trimming system of the sewing machine of the present invention is applied;
FIG. 2 is a schematic structural view of a thread trimming system of the sewing machine according to the present invention;
FIG. 3 is a bottom view of a thread trimming system of the sewing machine according to the present invention;
FIG. 4 is a structural diagram of the thread trimming system of the sewing machine provided by the present invention after the thread trimming moving blade is hidden;
FIG. 5 is a top view of the thread trimming system of the sewing machine of the present invention with the thread trimming assembly in a preset trimming position;
FIG. 6 is a top view of the thread trimming system of the sewing machine according to the present invention when the thread trimming moving blade is at the preset thread trimming position;
FIG. 7 is a view showing a structure of a thread trimming assembly in the thread trimming system of the sewing machine according to the present invention;
FIG. 8 is a view showing a structure of a thread trimming unit for trimming thread in the thread trimming system of the sewing machine according to the present invention;
FIG. 9 is a view showing a structure of a slider portion in the thread trimming system of the sewing machine according to the present invention.
Reference numerals:
the line cutting machine comprises a first axial screw 1, a driving connecting plate 2, a driving connecting rod 3, a fixed cutter connecting plate 4, a fixed cutter sliding groove 41, a second axial screw 5, a sliding block 6, a pressing strip 7, a screw 8, a fixed cutter 9, a line pressing blade 10, a movable cutter 11, an avoiding groove 111, a third axial screw 12, a fourth axial screw 13, a rotary driver 14, a driving pin 15, a movable cutter driving plate 16, a driving groove 161, a movable cutter driving block 17, a mounting plate 18, a line cutting crank 19, a line cutting movable cutter 20, a facial line 21, a needle plate 22 and a line cutting movable cutter connecting rod 23.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a thread trimming system of a sewing machine, which can reduce the occurrence of bird nests. The other core of the invention is to provide a sewing method applying the thread trimming system of the sewing machine, which can reduce the occurrence of bird nests.
It will be understood that when an element is referred to as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The thread trimming system of the sewing machine provided by the invention can be applied to a pattern sewing machine. Referring to fig. 1 to 9, in an embodiment, a thread trimming system of a sewing machine includes a thread trimming assembly, a movable thread trimming blade driving device, and a movable thread trimming blade 20.
The thread cutting assembly comprises a fixed knife 9 and a movable knife 11 which is rotatably connected with the fixed knife 9. The thread cutting movable knife driving device is connected with the movable knife 11. The thread cutting movable cutter driving device is used for driving the movable cutter 11 to move so that the movable cutter 11 and the fixed cutter 9 are matched for thread cutting and thread clamping. Specifically, the movable knife 11 and the fixed knife 9 have a certain height, and a rotating shaft between the movable knife 11 and the fixed knife 9 is arranged along the vertical direction during thread trimming, and after the movable knife 11 and the fixed knife 9 rotate to the meshed state in the height direction, the lower half part is relatively sharp and can be used for thread trimming, and the upper half part is used for clamping threads. Alternatively, the movable blade 11 and the stationary blade 9 may be rotated to the position for clamping the upper thread without cutting the thread first, and the movable blade 11 may be continuously driven to increase the rotation angle to cut the thread after the needle or the like is operated to be set, in accordance with the driving of the thread cutting movable blade driving device.
The movable cutter 20 for finishing the thread cutting is rotatably connected with the sewing machine shell. The trimming assembly is connected to the trimming movable knife 20 through the transmission mechanism, so that when the trimming movable knife 20 rotates towards the preset trimming position, the transmission mechanism drives the trimming assembly to be far away from the preset trimming position. The thread cutting end movable knife 20 is used for cutting the section thread 21 and the bottom thread when sewing is finished and is an original part of the sewing machine.
The thread cutting assembly is additionally arranged in the thread cutting system of the sewing machine, after a first needle of the needle raising sends 21 thread ends of the upper thread to the lower portion of the cloth, the thread cutting movable cutter driving device is controlled to drive the movable cutter 11 to move, so that the movable cutter 11 and the fixed cutter 9 are matched to cut off the 21 thread ends of the upper thread, and then subsequent sewing operation is carried out.
Because the thread end of the upper thread 21 left on the bottom surface of the cloth can be shortened during the starting sewing, no knot is formed between the bottom thread and the thread end of the upper thread 21, and the bird nest phenomenon caused by the thread end winding in the stitch can be effectively solved. The thread trimming component is of a trimming and clamping integrated structure, so that the problem of seam starting and thread falling can be solved while the problem of bird nests is solved. In addition, the scissors assembly and the end trimming are linked to avoid the position, so that the phenomenon that the trimming moving knife 20 touches the trimming assembly when trimming can be completely avoided in a mechanical mode.
Further, the fixed knife 9 is slidably connected to the sewing machine housing, so that the path of the thread cutting assembly for avoiding and ending the thread cutting movable knife 20 can be determined conveniently. Of course, in other embodiments, the stationary knife 9 may be rotatably attached to the sewing machine housing.
Further, referring to fig. 4, the trimming moving blade driving device includes a rotary driver 14 and a moving blade driving plate 16 connected to an output end of the rotary driver 14. Alternatively, the rotary drive 14 is a motor or an electromagnet. The housing of the rotary drive 14 is secured to the sewing machine housing by a mounting plate 18. The movable blade driving plate 16 is slidably connected to the movable blade 11. Specifically, as shown in fig. 3, an avoiding groove 111 is formed on the movable blade 11, the movable blade driving plate 16 is fixedly connected to the third axial screw 12, and the third axial screw 12 is slidably connected to the avoiding groove 111 and can rotate relatively.
In the process that the transmission mechanism drives the thread trimming assembly to slide away from the preset thread trimming position, the movable knife 11 slides relative to the movable knife driving plate 16 so as to keep the movable knife driving plate 16 still. Namely, the third axial screw 12 remains stationary during the process that the transmission mechanism drives the trimming assembly to slide to avoid the trimming movable knife 20, and during the process that the trimming movable knife 20 resets to slide after trimming. Through the sliding connection between the movable cutter driving plate 16 and the movable cutter 11, the interference of the sliding of the thread cutting assembly on the thread cutting movable cutter driving device can be avoided.
Of course, in other embodiments, the thread cutting movable knife driving device may also include a linear driver, such as a linear motor or an air cylinder, through which the movable knife 11 is driven to rotate on the stationary knife 9.
Further, referring to fig. 2, the trimming moving blade driving device further includes a moving blade driving block 17 fixedly connected to the output shaft of the rotary driver 14. Specifically, the movable blade driving block 17 is held tightly on the output shaft of the rotary driver 14. The moving blade driving block 17 is fixedly provided with a driving pin 15, and the moving blade driving plate 16 is provided with a driving groove 161. The drive pin 15 is embodied as a shaft screw. The drive pin 15 is slidably inserted into the drive groove 161, and the drive groove 161 can rotate relative to the drive pin 15. Specifically, the output shaft of the rotary driver 14 is parallel to the drive pin 15. The movable knife driving plate 16 is connected to the sewing machine shell in a sliding mode, the sliding direction of the movable knife driving plate is a straight line, specifically, at least two fourth axis screws 13 which are arranged in a collinear mode are fixed on the sewing machine shell, and the movable knife driving plate 16 is connected to the fourth axis screws 13 in a sliding mode, so that the movable knife driving plate 16 moves linearly. The linear motion of the movable blade driving plate 16 can provide convenience for planning the motion path of the movable blade 11.
Further, as shown in fig. 5 and 6, the transmission mechanism includes a thread trimming crank 19, a driving connecting plate 2 fixed on the thread trimming crank 19, a first link mechanism connected between the driving connecting plate 2 and the movable blade 20 for finishing thread trimming, and a second link mechanism connected between the driving connecting plate 2 and the fixed blade 9. The thread cutting crank 19, the driving connecting plate 2 and the first connecting rod mechanism are original structures of the sewing machine, the thread cutting crank 19 can be used for avoiding between the thread cutting assembly and the thread cutting movable knife 20 by directly adding the second connecting rod mechanism, the driving mechanism does not need to be additionally added, the avoidance is reliable, and the manufacturing cost is saved.
Further, referring to fig. 5, the first link mechanism includes a thread trimming ending movable blade link 23, and two ends of the link are respectively and rotatably connected to the driving link plate 2 and the thread trimming ending movable blade 20.
Further, referring to fig. 4, the second link mechanism includes a stationary blade connecting plate 4 and a driving link 3. The middle part of the fixed cutter connecting plate 4 is rotationally connected with the shell of the sewing machine through a second axial screw 5. One end of the fixed knife connecting plate 4 is rotatably connected to one end of the driving connecting rod 3, the other end of the fixed knife connecting plate is provided with a fixed knife sliding groove 41, correspondingly, the fixed knife 9 is fixedly connected with a bolt, the bolt is slidably connected into the fixed knife sliding groove 41, and the fixed knife sliding groove 41 can rotate relative to the bolt. The other end of the driving link 3 is rotatably connected to the driving link plate 2 by a first shaft screw 1. When the driving connecting plate 2 swings, the driving connecting rod 3 is driven to swing, and then the fixed cutter connecting plate 4 is driven to rotate around the second axial screw 5, and the fixed cutter connecting plate 4 drives the thread trimming assembly to slide on the sewing machine shell. The second link mechanism and the driving connecting plate 2 form a crank link structure to drive the thread cutting assembly.
Further, as shown in fig. 4 and 9, the stationary knife 9 is fixed on the sliding block 6, the pressing bar 7 is fixedly arranged on the sewing machine shell to form a sliding way, and the sliding block 6 is inserted into the sliding way in a sliding manner. The bolt is fixed on the sliding block 6. Through the setting of slider 6 and layering 7, the dismouting of trimming subassembly of being convenient for.
Furthermore, the thread cutting assembly further comprises a thread pressing piece 10 fixed on the fixed knife 9, and the movable knife 11 is arranged between the fixed knife 9 and the thread pressing piece 10 so as to better clamp the thread end of the upper thread.
The present embodiment provides a working process of a thread trimming system of a sewing machine as follows: when the first needle of the needle is raised during sewing the cloth, the cloth is pierced, the thread is hooked, and then the thread end of the upper thread 21 after the original needle is left on the bottom surface of the cloth when the thread take-up lever is raised to the highest point. At this time, the rotary driver 14 drives the movable blade driving block 17 and the movable blade driving plate 16 to perform the thread cutting operation of the movable blade 11, and the thread assembly cuts and clamps the thread end of the upper thread 21 as shown in fig. 8. Subsequently, the machine needle closely stitches 2 needles at an interval of 1mm or less, and when the 3 rd needle thread loop is hooked off from the needle plate hole, the rotary driver 14 drives the movable knife 11 to reset, so that the clamped thread end is loosened, and then the machine normally sews. When the sewing is finished and the thread cutting is finished, the thread cutting crank 19 drives the thread cutting movable knife 20 to cut threads, at the moment, the sliding block 6 connected with the thread cutting crank 19 drives the scissors assembly to carry out follow-up avoiding position, as shown in fig. 6, when the thread cutting movable knife 20 is finished to reset, the scissors assembly also resets, as shown in fig. 5, and therefore a set of sewing actions is finished.
In addition to the above-mentioned thread trimming system of the sewing machine, the present invention also provides a sewing method, which is applied to the thread trimming system of the sewing machine, specifically, the thread trimming system of the sewing machine provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly.
Specifically, the sewing method includes:
after the first needle of the needle raising sends the thread end of the upper thread 21 to the lower part of the cloth, the thread cutting movable cutter driving device is controlled to drive the movable cutter 11 to move, so that the movable cutter 11 and the fixed cutter 9 are matched to cut the thread end of the upper thread 21 and clamp the upper thread 21, and the thread is cut when the highest point of the thread take-up lever is particularly arranged;
closely sewing the cloth with a preset needle number at a needle pitch smaller than the preset needle pitch;
when the next needle with the preset number of needles is sewn and the needle leaves the needle plate hole, the thread cutting movable blade driving device is controlled to drive the movable blade 11 to move so as to enable the movable blade 11 and the fixed blade 9 to loosen the upper thread 21.
Wherein the preset gauge is 1mm, for example 0.8 mm. The needle pitch is used for sewing a preset number of needles, for example 2 needles, and when the needle leaves the needle plate hole during the third needle, the thread cutting assembly loosens the upper thread 21, and then normal sewing can be carried out. Wherein the needle pitch of the normal sewing is larger than the preset needle pitch. Through before normal sewing, the upper thread 21 is carried to the thread trimming subassembly and is sealed, can reliably lock upper thread 21 on the cloth, avoid the seam to take off the line.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The thread trimming system and the sewing method of the sewing machine provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A sewing machine thread trimming system, comprising: the thread trimming assembly comprises a fixed cutter (9) and a movable cutter (11) which is rotatably connected with the fixed cutter (9); the thread cutting movable knife driving device is connected to the movable knife (11) and used for driving the movable knife (11) to move so that the movable knife (11) and the fixed knife (9) can cut and clamp threads in a matching mode; the thread trimming finishing movable cutter (20) is rotatably connected to the sewing machine shell, the thread trimming assembly is connected to the thread trimming finishing movable cutter (20) through a transmission mechanism, when the thread trimming finishing movable cutter (20) rotates towards a preset thread trimming position, the transmission mechanism drives the thread trimming assembly to be far away from the preset thread trimming position, and the fixed cutter (9) is connected to the sewing machine shell in a sliding mode;
the trimming moving knife driving device comprises a rotary driver (14) and a moving knife driving plate (16) connected to the output end of the rotary driver (14), and the moving knife driving plate (16) is connected to the moving knife (11) in a sliding manner; an avoidance groove (111) is formed in the movable knife (11), the movable knife driving plate (16) is fixedly connected with a third axial screw (12), the third axial screw (12) is connected in the avoidance groove (111) in a sliding mode and can rotate relatively; in the process that the transmission mechanism drives the thread trimming assembly to slide away from the preset thread trimming position, the movable cutter (11) slides relative to the movable cutter driving plate (16) so as to keep the movable cutter driving plate (16) static;
the transmission mechanism comprises a trimming crank (19), a driving connecting plate (2) fixed on the trimming crank (19), a first connecting rod mechanism connected between the driving connecting plate (2) and the trimming movable knife (20), and a second connecting rod mechanism connected between the driving connecting plate (2) and the fixed knife (9); the first connecting rod mechanism comprises a thread trimming ending movable cutter connecting rod (23), and two ends of the first connecting rod mechanism are respectively and rotatably connected to the driving connecting plate (2) and the thread trimming ending movable cutter (20).
2. The thread trimming system of the sewing machine according to claim 1, wherein the thread trimming moving blade driving device further comprises a moving blade driving block (17) fixedly connected to an output shaft of the rotary driver (14), a driving pin (15) is fixedly arranged on the moving blade driving block (17), and a driving slot (161) is arranged on the moving blade driving plate (16); the driving pin (15) is inserted into the driving groove (161) in a sliding mode, and the driving groove (161) can rotate relative to the driving pin (15); the movable knife driving plate (16) is connected to the sewing machine shell in a sliding mode, and the sliding direction is a straight line.
3. The sewing machine thread trimming system according to claim 1 or 2, wherein the second link mechanism comprises a stationary knife link plate (4) and a drive link (3); the middle part of the fixed knife connecting plate (4) is rotatably connected to the sewing machine shell, one end of the fixed knife connecting plate is rotatably connected to one end of the driving connecting rod (3), a fixed knife sliding groove (41) is formed in the other end of the fixed knife connecting plate, a bolt is fixedly connected to the fixed knife (9), the bolt is slidably connected to the fixed knife sliding groove (41), and the fixed knife sliding groove (41) can rotate relative to the bolt; the other end of the driving connecting rod (3) is rotatably connected to the driving connecting plate (2).
4. The trimming system of a sewing machine according to claim 3, wherein the stationary knife (9) is fixed on a slide block (6), a pressing bar (7) is fixedly arranged on a sewing machine shell to form a slide way, and the slide block (6) is inserted in the slide way in a sliding manner; the bolt is fixed on the sliding block (6).
5. The trimming system of sewing machine according to claim 1 or 2, wherein the trimming assembly further comprises a thread pressing blade (10) fixed to the stationary knife (9), and the movable knife (11) is disposed between the stationary knife (9) and the thread pressing blade (10).
6. A sewing method characterized by applying the sewing machine thread trimming system according to any one of claims 1 to 5, the sewing method comprising:
after a first needle of the needle raising sends the upper thread end to the lower part of the cloth, the thread cutting movable cutter driving device is controlled to drive the movable cutter (11) to move, so that the movable cutter (11) and the fixed cutter (9) are matched to cut off the upper thread end and clamp the upper thread;
closely sewing the cloth with a preset needle number at a needle pitch smaller than the preset needle pitch;
when the next needle with the preset needle number is sewn and the needle leaves the needle plate hole, the thread cutting movable cutter driving device is controlled to drive the movable cutter (11) to move, so that the movable cutter (11) and the fixed cutter (9) loosen the upper thread.
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| CN202011063789.7A CN112064221B (en) | 2020-09-30 | 2020-09-30 | Thread cutting system of sewing machine and sewing method |
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| CN202011063789.7A CN112064221B (en) | 2020-09-30 | 2020-09-30 | Thread cutting system of sewing machine and sewing method |
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| CN112064221A CN112064221A (en) | 2020-12-11 |
| CN112064221B true CN112064221B (en) | 2021-10-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4323494C1 (en) * | 1993-07-14 | 1994-08-18 | Union Special Gmbh | Thread-severing device for a cylinder-arm chain-stitch sewing machine |
| CN201317861Y (en) * | 2008-12-10 | 2009-09-30 | 庄卫东 | Thread cutting mechanism for electric sewing machine |
| JP5403401B2 (en) * | 2009-02-24 | 2014-01-29 | ヤマトミシン製造株式会社 | Sewing machine thread trimmer |
| JP2010213767A (en) * | 2009-03-13 | 2010-09-30 | Juki Corp | Thread-cutting device of sewing machine |
| CN204780201U (en) * | 2015-06-17 | 2015-11-18 | 浙江中捷缝纫科技有限公司 | Sewing machine's thread trimming mechanism |
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