CN107956052B - Sewing machine and thread shifting device thereof - Google Patents
Sewing machine and thread shifting device thereof Download PDFInfo
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- CN107956052B CN107956052B CN201711420078.9A CN201711420078A CN107956052B CN 107956052 B CN107956052 B CN 107956052B CN 201711420078 A CN201711420078 A CN 201711420078A CN 107956052 B CN107956052 B CN 107956052B
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- thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B53/00—Thread- or cord-laying mechanisms; Thread fingers
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Abstract
The invention discloses a sewing machine and a thread shifting device thereof, comprising a mounting plate, a thread shifting knife, a thread clamping assembly, a driving crank, a transmission connecting rod, a thread releasing connecting rod, a rotary driving piece and a linear driving piece which are arranged on the mounting plate, and a return spring for driving the transmission connecting rod to return; when the thread needs to be pulled by the thread pulling device after sewing, the rotary driving piece drives the driving crank to swing leftwards, the transmission connecting rod moves along with the rotary driving piece, the return spring is stretched, the transmission connecting rod drives the thread pulling knife to rotate by a certain angle, then the thread pulling knife hooks the machine needle thread to return under the action of the return spring, and the machine needle thread is clamped by the thread clamping assembly in a matched mode.
Description
Technical Field
The invention relates to the technical field of sewing, in particular to a thread shifting device of a sewing machine. In addition, the invention also relates to a sewing machine comprising the thread shifting device.
Background
When a sewing mechanism sews cloth, a thread end with a certain length is left at a needle eye of a machine needle when the sewing mechanism starts sewing, in order to ensure that the thread end can not be separated from the needle eye when the sewing is started, a sewing anti-thread-off device is usually arranged, the thread end is pulled up by utilizing a thread pulling device when the last sewing is finished, so that the machine needle thread has a certain tension, and the machine can drive the machine needle thread to smoothly start sewing when the sewing is started next time.
After several sewing needles form stitches, the machine needle does not need to have tension force so as to ensure the following sewing stitches to be neat and beautiful; however, the existing thread shifting device only has the thread shifting function, and in order to ensure that the machine needle thread smoothly starts sewing and feeds the thread, the tensioning force of the machine needle thread is large, so that the machine needle thread takes off the thread at a late time after starting sewing, and the sewing requirement cannot be met.
Therefore, how to make the sewing needle thread smoothly start and timely take off the thread is a technical problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a thread shifting device of a sewing machine, which integrates a thread shifting function and a thread loosening function and can ensure that a machine needle thread can smoothly start sewing and timely take off the thread. Another object of the present invention is to provide a sewing machine comprising the thread-shifting device.
In order to solve the technical problem, the invention provides a thread shifting device of a sewing machine, which comprises a mounting plate, a thread clamping assembly, a thread shifting knife, a rotary driving piece and a linear driving piece, wherein the rotary driving piece and the linear driving piece are used for driving the thread shifting knife to rotate; the linear driving piece is hinged with the driving crank through a loose wire connecting rod, the linear driving piece can drive the driving crank to swing through the loose wire connecting rod, and the range of the linear driving piece driving the wire poking knife to rotate is smaller than the range of the rotary driving piece driving the wire poking knife to rotate; a support plate is further mounted on the mounting plate and below the transmission connecting rod, one end of the support plate is an extension part extending downwards to the lower portion of the mounting plate, and the wire clamping assembly is mounted on the extension part and is arranged opposite to the lower portion of the wire poking knife; the thread pulling device is characterized by further comprising a return spring for driving the transmission connecting rod to return, and when the return spring is in a return state, the lower portion of the thread pulling knife can be matched with the thread clamping assembly to clamp a machine needle thread.
Preferably, the linear driving member is a linear electromagnet, the left end of the thread releasing connecting rod is hinged to the outer end of a linear iron core of the linear magnet, a snap spring is mounted on the outer end of the linear iron core, a thread releasing return spring is sleeved between the linear magnet and the snap spring and on the linear iron core, and two ends of the thread releasing return spring are respectively abutted to or fixedly connected with the linear magnet and the snap spring.
Preferably, a rubber pad for reducing vibration and noise is installed at the left end of the linear electromagnet.
Preferably, the rotary driving part is a rotary electromagnet, and one end of the driving crank, which is far away from the transmission connecting rod, is fixed on a rotary iron core of the rotary electromagnet.
Preferably, the controller is used for controlling the on and off of the rotary electromagnet and the linear electromagnet.
Preferably, still be equipped with two spacing axles on the mounting panel, the left end of drive connecting rod has downwardly extending's baffle and the gag lever post that upwards extends, just the baffle with the gag lever post is located two between the spacing axle, the baffle is in rotary driving spare drives can with one of them during the drive crank pendulum spacing axle supports and leans on, the gag lever post is in can with another during the drive crank return spacing axle supports and leans on.
Preferably, the limiting shaft is an eccentric shaft.
Preferably, return spring is located the below of transmission connecting rod, return spring's right-hand member is installed on the mounting panel, and the left end is installed on the gag lever post.
Preferably, the mounting plate is further provided with a pressing plate for enabling the wire poking knife to be tightly attached to the mounting plate in a rotating mode, and the movable end of the wire poking knife penetrates through a gap between the mounting plate and the pressing plate and then is arranged opposite to the wire clamping assembly.
The invention also provides a sewing machine, which comprises a machine body and a thread shifting device arranged on the machine body, wherein the thread shifting device is specifically any one of the thread shifting devices.
The invention provides a thread shifting device of a sewing machine, which comprises a mounting plate, a thread clamping assembly, a thread shifting knife, a rotary driving piece and a linear driving piece, wherein the rotary driving piece and the linear driving piece are used for driving the thread shifting knife to rotate; the linear driving piece is hinged with the driving crank through the loose wire connecting rod, the linear driving piece can drive the driving crank to swing through the loose wire connecting rod, and the range of the linear driving piece driving the wire poking knife to rotate is smaller than the range of the rotary driving piece driving the wire poking knife to rotate; a support plate is further arranged on the mounting plate and below the transmission connecting rod, one end of the support plate is an extension part which extends downwards to the lower part of the mounting plate, and the wire clamping assembly is arranged on the extension part and is opposite to the lower part of the wire poking knife; the thread drawing device is characterized by further comprising a return spring for driving the transmission connecting rod to return, and when the return spring is in a return state, the lower portion of the thread drawing knife can be matched with the thread clamping assembly to clamp a machine needle thread.
By adopting the thread shifting device provided by the invention, when the thread needs to be shifted by the thread shifting device after sewing is finished, the rotary driving piece drives the driving crank to swing leftwards, the transmission connecting rod moves along with the rotary driving piece, the return spring is stretched, the transmission connecting rod drives the thread shifting knife to rotate for a certain angle, so that the knife head of the thread shifting knife exceeds the machine needle thread, then the rotary driving piece stops driving, the thread shifting knife and the transmission connecting rod reset under the elastic action of the return spring, and the knife head of the thread shifting knife catches the machine needle thread and is matched with the thread clamping assembly to clamp the machine needle thread in the resetting process to prepare for next sewing; when the seam is played next time, because the machine needle line has certain tensile force, the machine can play the seam smoothly, when several needles of sewing form the line seam and need the pine line after, the straight line driving piece drives drive crank small amplitude swing left through the pine line connecting rod, the transmission connecting rod moves small amplitude left thereupon, and then make and dial a line sword anticlockwise rotation certain angle, the double-layered line subassembly is kept away from to the tool bit of dialling the line sword, the machine needle line breaks away from the tool bit, realize the pine line, satisfy the sewing demand, then the straight line driving piece stops the drive, under return spring's elastic force effect, dial line sword and transmission connecting rod reset.
In conclusion, the thread shifting device of the sewing machine provided by the invention is simple in structure, integrates the thread shifting function and the thread loosening function, can ensure that the machine needle thread can smoothly start sewing and timely take off the thread, and can meet the sewing requirement.
The sewing machine provided by the invention comprises the thread shifting device, and the thread shifting device has the technical effects, so that the sewing machine also has the same technical effects, and the detailed description is omitted.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a thread-shifting device of a sewing machine according to the present invention;
FIG. 2 is a rear view of one embodiment of a thread take-up device of a sewing machine according to the present invention;
FIG. 3 is a side view of an embodiment of a thread take-up device of a sewing machine according to the present invention.
Detailed Description
The core of the invention is to provide a thread shifting device of a sewing machine, which integrates the thread shifting function and the thread loosening function into a whole and can ensure that the machine needle thread can be smoothly sewed and can be timely released. Another core of the invention is to provide a sewing machine comprising the thread-shifting device.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic structural view of a thread-shifting device of a sewing machine according to an embodiment of the present invention; FIG. 2 is a rear view of one embodiment of a thread take-up device of a sewing machine according to the present invention; FIG. 3 is a side view of an embodiment of a thread take-up device of a sewing machine according to the present invention.
The invention provides a thread-shifting device of a sewing machine, which comprises a mounting plate 1, a thread clamping component 4, a thread-shifting knife 5, a rotary driving piece 2 and a linear driving piece 3 for driving the thread-shifting knife 5 to rotate, wherein the linear driving piece 3 is mounted at the left end of the mounting plate 1, the rotary driving piece 2 is mounted at the middle part of the mounting plate 1, the middle part of the thread-shifting knife 5 is hinged at the right end of the mounting plate 1, the lower part of the thread-shifting knife 5 is provided with a tool bit for hooking a machine needle thread, the thread-shifting knife 5 can rotate by taking a hinge point connected with the mounting plate 1 at the middle part as a center, a driving crank 6 and a driving connecting rod 7 are arranged between the rotary driving piece 2 and the thread-shifting knife 5, the rotary driving piece 2 can drive the driving crank 6 to swing, the left end of the driving connecting rod 7 is hinged with the driving crank 6, the right end is hinged with the, the driving crank 6 drives the wire poking knife 5 to rotate through the transmission connecting rod 7; linear drive piece 3 is articulated with drive crank 6 through loose wire connecting rod 9, and linear drive piece 3 can drive crank 6 swings through loose wire connecting rod 9, and then also can drive line poking knife 5 through transmission connecting rod 7 and rotate, and for satisfying the sewing user demand, linear drive piece 3 drives line poking knife 5 pivoted range and is less than rotary drive piece 2 and drives line poking knife 5 pivoted range.
In addition, a support plate 8 is further mounted on the mounting plate 1 and below the transmission connecting rod 7, one end of the support plate 8 is an extension part extending downwards to the lower part of the mounting plate 1, and the wire clamping assembly 4 is mounted on the extension part and is arranged opposite to the lower part of the wire poking knife 5; the thread drawing device is characterized by further comprising a return spring 10 for driving the transmission connecting rod 7 to return, and when the return spring 10 is in a return state, the lower portion of the thread drawing knife 5 can be matched with the thread clamping assembly 4 to clamp a machine needle thread.
By adopting the thread shifting device provided by the invention, when the thread shifting device needs to shift threads after sewing is finished, the rotary driving piece 2 drives the driving crank 6 to swing leftwards, the transmission connecting rod 7 moves along with the rotary driving piece, the return spring 10 is stretched, the transmission connecting rod 7 drives the thread shifting knife 5 to rotate for a certain angle, so that the knife head of the thread shifting knife 5 exceeds the machine needle threads, then the rotary driving piece 2 stops driving, the thread shifting knife 5 and the transmission connecting rod 7 reset under the elastic action of the return spring 10, and the knife head of the thread shifting knife 5 hooks the machine needle threads and is matched with the thread clamping component 4 to clamp the machine needle threads in the resetting process, so that preparation is made for next sewing;
when starting up the seam next time, because the machine needle line has certain tensile force, the machine can play the seam smoothly, when needing to loosen the line after several sewing needles form the stitch seam, linear driving piece 3 drives drive crank 6 through thread loosening connecting rod 9 and swings to a small extent left, drive connecting rod 7 moves to a small extent left along with it, and then makes the certain angle of 5 anticlockwise rotations of line shifting knife, the tool bit of line shifting knife 5 is kept away from thread clamping component 4, the machine needle line breaks away from the tool bit, realize the pine line, satisfy the sewing demand, then linear driving piece 3 stops driving, under return spring 10's elasticity effect, line shifting knife 5 and drive connecting rod 7 reset.
In conclusion, the thread shifting device of the sewing machine provided by the invention is simple in structure, integrates the thread shifting function and the thread loosening function, can ensure that the machine needle thread can smoothly start sewing and timely take off the thread, and can meet the sewing requirement.
Specifically, the linear driving part 3 can be a linear electromagnet, the left end of the thread releasing connecting rod 9 is hinged with the outer end part of the linear iron core 11 of the linear magnet, the right end of the thread releasing connecting rod 9 is hinged with the driving crank 6, and the linear electromagnet is simple and convenient to control and has a certain linear stroke; the rotary driving piece 2 is preferably a rotary electromagnet, and one end of the driving crank 6, which is far away from the transmission connecting rod 7, is fixed on a rotary iron core of the rotary electromagnet, so that the rotary electromagnet is simple and convenient to control.
When the wire poking device needs to poke wires, the rotating electromagnet is electrified, the rotating iron core rotates, the wire poking knife 5 is driven to rotate through the driving crank 6 and the transmission connecting rod 7, when the wire poking device needs to reset, the rotating electromagnet is controlled to be powered off, the rotating iron core stops rotating, and the transmission connecting rod 7, the wire poking knife 5 and the like can reset under the action of the return spring 10; when the thread is required to be loosened, the linear electromagnet is electrified, the linear iron core 11 electrified by the linear electromagnet linearly moves leftwards, the linear iron core 11 drives the driving crank 6 to rotate in a small range through the thread loosening connecting rod 9, the thread pulling knife 5 can be driven to rotate anticlockwise for a certain angle through the transmission connecting rod 7, the thread loosening is realized, the linear electromagnet is controlled to be powered off after the thread is loosened, and the thread pulling knife 5, the transmission connecting rod 7 and the like can reset under the action of the return spring 10.
In addition, a controller can be arranged, the on-off of the rotary electromagnet and the linear electromagnet is controlled through the controller, and the automation degree of wire poking and wire loosening is improved.
Of course, the rotary driving element 2 may be a rotary motor, and the linear driving element 3 may be other driving elements such as a linear motor, and the like, and all of them are within the protection scope of the present invention.
Furthermore, a wire-loosening return spring 13 can be sleeved on the linear iron core 11, a snap spring 12 can be installed at the outer end of the linear iron core 11, the wire-loosening return spring 13 is located between the linear magnet and the snap spring 12, and two ends of the wire-loosening return spring 13 are respectively abutted against or fixedly connected with the linear magnet and the snap spring 12; when the linear electromagnet is electrified and the linear iron core 11 moves leftwards to realize the wire loosening, the wire loosening reset spring 13 is compressed, and when the linear electromagnet is powered off after the wire loosening, the linear iron core 11, the wire shifting knife 5 and the like can reset under the combined action of the wire loosening reset spring 13 and the return spring 10, so that the resetting is quicker and more reliable.
In addition, in order to reduce the impact, vibration and noise when the linear iron core 11 is reset, a vibration damping and sound absorbing device such as a rubber pad 18 can be installed at the left end of the linear electromagnet, so that the working environment can be optimized, and the service life of the wire poking device can be prolonged.
In the thread pulling device of the sewing machine provided by the specific embodiment of the invention, the thread clamping component 4 can specifically comprise a thin thread clamping piece and a thick thread clamping piece which are stacked, and the thin thread clamping piece and the thick thread clamping piece can be fixedly connected with the support plate 8 through the anti-loosening screw and the pressure adjusting screw.
On the basis of the above embodiments, the thread-shifting device of the sewing machine provided by the embodiments of the present invention, the mounting plate 1 may further be provided with two limiting shafts 14, the left end of the transmission link 7 may have a baffle 15 extending downward and a limiting rod 16 extending upward, both the baffle 15 and the limiting rod 16 are located between the two limiting shafts 14, the baffle 15 can abut against one of the limiting shafts 14 when the driving crank 6 is driven by the rotary driving member 2 to swing, and the limiting rod 16 can abut against the other limiting shaft 14 when the driving crank 6 returns; the two limiting shafts 14 are respectively matched with the baffle 15 and the limiting rod 16, and can respectively limit the movement and return strokes of the transmission connecting rod 7, so that the limitation of the rotation angle of the wire poking knife 5 is realized, and the wire hooking and return wire clamping can be accurately realized.
Furthermore, the limiting shaft 14 can be preferably an eccentric shaft, the limiting stroke can be adjusted by rotating the two eccentric shafts, the adjustment of the rotation angle of the wire poking knife 5 is realized, the adjustment is simple and convenient, the limiting position adjustment of the eccentric shaft is continuous and is not interrupted, the adjustment precision is high, and the actual requirements can be met.
Further, according to the thread-shifting device of the sewing machine provided by the embodiment of the invention, the return spring 10 can be arranged below the transmission connecting rod 7, the right end of the return spring 10 is arranged on the mounting plate 1, and the left end of the return spring is arranged on the limiting rod 16, so that the arrangement is more reasonable.
On the basis of the above embodiments, according to the thread pulling device of the sewing machine provided by the embodiments of the present invention, the mounting plate 1 may further be provided with a pressing plate 17, the lower portion of the thread pulling knife 5 passes through the gap between the mounting plate 1 and the pressing plate 17 and then is arranged opposite to the thread clamping assembly 4, the thread pulling knife 5 can be rotated by clinging to the mounting plate 1 through the pressing plate 17, the lower end of the thread pulling knife 5 is prevented from tilting outward, and the lower portion of the thread pulling knife 5 is ensured to be matched with the thread clamping assembly 4 to clamp the machine needle thread.
In addition to the thread-shifting device, the present invention further provides a sewing machine including the thread-shifting device, and the structure of other parts of the sewing machine is referred to the prior art and is not described herein again.
In the description of the present application, it is to be understood that the terms "left", "right", "upper", "lower", and the like, indicate orientations or relationships based on the orientations or positional relationships shown in the drawings, are used for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The sewing machine and the thread-shifting device thereof 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 (9)
1. The thread shifting device of the sewing machine is characterized by comprising a mounting plate, a thread clamping assembly, a thread shifting knife, a rotary driving piece and a linear driving piece, wherein the rotary driving piece and the linear driving piece are used for driving the thread shifting knife to rotate; the linear driving piece is hinged with the driving crank through a thread loosening connecting rod, the linear driving piece can drive the driving crank to swing through the thread loosening connecting rod, the linear driving piece drives the thread poking knife to rotate by an amplitude smaller than an amplitude of the rotary driving piece driving the thread poking knife to rotate, the rotary driving piece is used for driving the thread poking knife to rotate and enabling a knife head of the thread poking knife to exceed a machine needle thread, and the linear driving piece is used for driving the knife head of the thread poking knife to be far away from the thread clamping assembly and enabling the machine needle thread to be separated from the knife head to achieve thread loosening; a support plate is further mounted on the mounting plate and below the transmission connecting rod, one end of the support plate is an extension part extending downwards to the lower portion of the mounting plate, and the wire clamping assembly is mounted on the extension part and is arranged opposite to the lower portion of the wire poking knife; the lower part of the thread poking knife can be matched with the thread clamping assembly to clamp a machine needle thread when the return spring is in a return state;
still install on the mounting panel and be used for making it hugs closely to dial the line sword mounting panel pivoted clamp plate, dial the expansion end of line sword pass the mounting panel with behind the clearance between the clamp plate with press from both sides the line subassembly and set up relatively.
2. The wire pulling device according to claim 1, wherein the linear driving member is a linear electromagnet, the left end of the wire releasing connecting rod is hinged to the outer end of a linear iron core of the linear magnet, a snap spring is mounted on the outer end of the linear iron core, a wire releasing return spring is sleeved between the linear magnet and the snap spring and on the linear iron core, and two ends of the wire releasing return spring are respectively abutted against or fixedly connected with the linear magnet and the snap spring.
3. The thread take-up device as claimed in claim 2, wherein a rubber pad for reducing vibration and noise is installed at the left end of the linear electromagnet.
4. The thread take-up device as claimed in claim 2, wherein the rotary driving member is a rotary electromagnet, and an end of the driving crank remote from the transmission link is fixed to a rotary iron core of the rotary electromagnet.
5. The wire poking device according to claim 4, further comprising a controller for controlling the on/off of the rotary electromagnet and the linear electromagnet.
6. The wire poking device according to claim 4, wherein two limiting shafts are further arranged on the mounting plate, a baffle plate extending downwards and a limiting rod extending upwards are arranged at the left end of the transmission connecting rod, the baffle plate and the limiting rod are located between the two limiting shafts, the baffle plate can abut against one of the limiting shafts when the rotary driving piece drives the driving crank to swing, and the limiting rod can abut against the other limiting shaft when the driving crank returns.
7. The thread take-up device as claimed in claim 6, wherein the limit shaft is an eccentric shaft.
8. The wire poking device according to claim 7, wherein the return spring is located below the transmission connecting rod, the right end of the return spring is mounted on the mounting plate, and the left end of the return spring is mounted on the limiting rod.
9. A sewing machine comprising a machine body and a thread take-up device mounted on the machine body, characterized in that the thread take-up device is embodied as the thread take-up device of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711420078.9A CN107956052B (en) | 2017-12-25 | 2017-12-25 | Sewing machine and thread shifting device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711420078.9A CN107956052B (en) | 2017-12-25 | 2017-12-25 | Sewing machine and thread shifting device thereof |
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| Publication Number | Publication Date |
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| CN107956052A CN107956052A (en) | 2018-04-24 |
| CN107956052B true CN107956052B (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711420078.9A Active CN107956052B (en) | 2017-12-25 | 2017-12-25 | Sewing machine and thread shifting device thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115247324B (en) * | 2021-04-25 | 2023-06-20 | 杰克科技股份有限公司 | Upper thread clamp, thread passing assembly and sewing machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5431119A (en) * | 1993-10-07 | 1995-07-11 | The Singer Company N.V. | Thread end holding device for a sewing machine |
| KR101365472B1 (en) * | 2007-06-07 | 2014-02-21 | 주식회사 썬스타 | Apparatus for rotation wiper of sewing machine |
| CN202359348U (en) * | 2011-12-05 | 2012-08-01 | 宁波舒普机电科技有限公司 | Thread end removing device for sewing machine |
| CN204097715U (en) * | 2014-08-20 | 2015-01-14 | 宁波舒普机电科技有限公司 | A kind of line stripper of Sewing machines |
| WO2016166866A1 (en) * | 2015-04-16 | 2016-10-20 | 三菱電機株式会社 | Needle thread gripping device and sewing machine |
| CN107268203B (en) * | 2017-06-29 | 2020-06-09 | 杰克缝纫机股份有限公司 | Wire pulling device |
| CN107254745B (en) * | 2017-06-29 | 2020-02-04 | 杰克缝纫机股份有限公司 | Sewing anti-falling device of sewing machine |
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2017
- 2017-12-25 CN CN201711420078.9A patent/CN107956052B/en active Active
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Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |