CN107268202B - Thread cutting mechanism of sewing machine - Google Patents
Thread cutting mechanism of sewing machine Download PDFInfo
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- CN107268202B CN107268202B CN201710686107.XA CN201710686107A CN107268202B CN 107268202 B CN107268202 B CN 107268202B CN 201710686107 A CN201710686107 A CN 201710686107A CN 107268202 B CN107268202 B CN 107268202B
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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
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming mechanism of a sewing machine, and belongs to the technical field of sewing machines. The wire cutting mechanism solves the problem that the existing wire cutting mechanism is difficult to adjust the meshing position of the first movable knife and the second movable knife. This thread trimming mechanism of sewing machine, including fixing pivot one on the bottom plate and pivot two with pivot one parallel arrangement, the cover is equipped with main knife rest and the auxiliary knife rest that can revolute pivot one rotation in the pivot one, be equipped with movable sword one on the main knife rest, be equipped with movable sword two on the auxiliary knife rest, the swing arm has been linked firmly in the pivot two, it has connecting rod one to articulate on the main knife rest, it has connecting rod two to articulate on the auxiliary knife rest, the free end of connecting rod one, the free end of connecting rod two and the free end three of swing arm are in the same place through same articulated shaft, be equipped with the regulation structure that is used for adjusting movable sword one and movable sword two interlock position between main knife rest and the auxiliary knife rest. The invention has the advantages of simple structure, convenient adjustment, effective improvement of the thread cutting quality and the like.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and relates to a thread trimming mechanism of a sewing machine.
Background
The existing thread cutting structure for sewing is provided with a movable knife and a fixed knife which are positioned below a needle plate and above a rotating shuttle, the fixed knife is fixed on a sewing machine base body, the movable knife is driven to rotate around a lower shaft through a driving mechanism, and a thread is cut off through the occlusion of the movable knife and the fixed knife. The stitch of the sewing machine is formed by the mutual movement of the needle and the rotating shuttle, the sewing thread can not touch the trimming knife edge under the normal sewing state, meanwhile, the movement of the needle and the rotating shuttle can not be influenced, the movable knife and the fixed knife have to avoid the movement range of the movable part, the fixed knife is fixed at one side of the center of the needle, so that a distance is reserved between the fixed knife and the center of the needle, the overlapped position of the cutting part of the movable knife and the fixed knife has a distance with the needle, the overlapped position of the cutting part can also be changed due to the influence of various reasons such as improper installation, when the thread trimming is needed, the movable knife is driven to rotate by the driving mechanism, the movable knife is meshed with the fixed knife to complete the thread trimming, the length of the thread head remained on the cloth after the thread trimming is longer due to the safe stitch position existing between the needle plate hole, the beauty degree of the thread head remained on the cloth is influenced, so that the subsequent thread head trimming of a costume worker is needed, and the labor cost of the factory is increased.
Therefore, the chinese patent discloses a thread trimming mechanism of a sewing machine [ publication number CN105970507a ], a rotating shaft is arranged in a housing of the sewing machine, the thread trimming mechanism includes: the main tool rest, the auxiliary tool rest and the driving mechanism are arranged in the shell; the main tool rest is provided with a main movable tool; the auxiliary knife rest is provided with an auxiliary moving knife; the output end of the driving mechanism is connected with a main crank and an auxiliary crank, the main crank is connected with a main tool rest, and the auxiliary crank is connected with an auxiliary tool rest; the output end of the driving mechanism rotates in a reciprocating way; the driving mechanism drives the main knife rest to rotate around the rotating shaft in a reciprocating mode through the main crank, and the driving mechanism drives the auxiliary knife rest to rotate around the rotating shaft in a reciprocating mode through the auxiliary crank, so that the main movable knife and the auxiliary movable knife move in opposite directions to finish the scissors closing.
When the mechanism is adjusted, the angle between the main crank body and the central axis of the main driving shaft is adjusted, and the angle between the auxiliary crank and the central axis of the auxiliary driving shaft is adjusted, so that the cutting closing positions of the main movable knife and the auxiliary movable knife are positioned under the needle of the sewing machine. Besides two places to be adjusted, the main body of the main crank and the whole auxiliary crank are also positioned at a deeper place of the mechanism, so that the adjustment is very inconvenient.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a thread trimming mechanism of a sewing machine, which is convenient to adjust.
The purpose of the invention can be realized by the following technical scheme:
this thread trimming mechanism of sewing machine, including fixing pivot one on the bottom plate and with pivot one parallel arrangement's pivot two, pivot one go up the cover and be equipped with main knife rest and the auxiliary knife rest that can revolute a rotation of axes, the main knife rest on be equipped with movable sword one, the auxiliary knife rest on be equipped with movable sword two, pivot two on link firmly the swing arm, its characterized in that, the main knife rest on articulated have connecting rod one, the auxiliary knife rest on articulated have connecting rod two, the free end of connecting rod one, the free end of connecting rod two and the free end three of swing arm are in the same place through same articulated shaft, main knife rest and auxiliary knife rest between be equipped with the regulation structure that is used for adjusting movable sword one and movable sword two interlock positions.
In foretell sewing machine's thread trimming mechanism, the articulated shaft be the eccentric round pin, the regulation structure including be located eccentric portion one and eccentric portion two on the eccentric round pin, through-hole one has on the free end of connecting rod one, through-hole two has on the free end of connecting rod two, eccentric portion one cooperation locate in the through-hole one, eccentric portion two cooperations locate in the through-hole two, the eccentric round pin fix on the swing arm through dismantling the subassembly.
In foretell sewing machine's thread trimming mechanism, the subassembly of dismantling including locating the locking hole on the swing arm free end, locating the screw hole and the locking screw of threaded connection in the screw hole of its inner end and locking hole intercommunication of swing arm lateral wall, the eccentric pin wear to establish in the locking hole, the inner of locking screw supports and leans on the lateral wall of eccentric pin.
In the thread trimming mechanism of the sewing machine, the adjusting structure comprises an eccentric pin with a first eccentric part and a second eccentric part, the eccentric pin is parallel to the first rotating shaft, a third through hole is formed in one end, close to the main knife rest, of the first connecting rod, the fourth through hole is formed in the main knife rest, the first eccentric part is matched with the third through hole, the second eccentric part is matched with the fourth through hole, and the first eccentric pin is fixed on the main knife rest through the detachable component.
In the thread trimming mechanism of the sewing machine, the detachable assembly I comprises a first threaded hole and a first locking screw, the first threaded hole is formed in the main tool rest, the inner end of the first threaded hole is communicated with the through hole, the first locking screw is in threaded connection with the first threaded hole, and the inner end of the first locking screw abuts against the second eccentric part.
In foretell sewing machine's thread trimming mechanism, the regulation structure include the eccentric pin that has eccentric part one and eccentric part two on it, the eccentric pin is parallel with pivot one, the one end that connecting rod two is close to the auxiliary knife rest through-hole five has, the auxiliary knife rest on have through-hole six, the cooperation of eccentric part one locate in through-hole five, the cooperation of eccentric part two locate in through-hole six, the eccentric pin fix on the auxiliary knife rest through dismantling subassembly two.
In the thread trimming mechanism of the sewing machine, the detachable component II comprises a threaded hole II and a locking screw II, the inner end of the threaded hole II is communicated with the through hole six, the threaded hole II is arranged on the auxiliary tool rest, the locking screw II is in threaded connection with the threaded hole II, and the inner end of the locking screw II abuts against the eccentric part II.
In the thread trimming mechanism of the sewing machine, a knife rest pressing plate is arranged at one end of the first rotating shaft, which is far away from the bottom plate. The pressing plate is used for limiting the axial positions of the main tool rest and the auxiliary tool rest and placing the main tool rest and the auxiliary tool rest to axially move. The main tool rest and the auxiliary tool rest are arranged in a stacked mode in the axial direction of the first rotating shaft. In order to enable the first movable knife and the second movable knife to be better engaged, the first movable knife is arranged to be in an arc shape, and the circle center of the first movable knife is located on the central axis of the first rotating shaft, and the second movable knife is arranged to be in an arc shape, and the circle center of the second movable knife is located on the central axis of the first rotating shaft.
Under initial condition, the blade of movable sword one and the blade and the faller hole of movable sword two all keep outside safe distance, when needs trimming, automatic control unit drive pivot two rotate clockwise, drive main knife rest and assist the toolframe through connecting rod one and connecting rod two and rotate, when the blade of movable sword one and movable sword two meshes mutually, accomplish the trimming action, the meshing position of movable sword one and movable sword two blades is located the faller hole under this moment, and then the maximize has shortened the distance in trimming position and faller hole, make the end of a thread that remains on the cloth shortest. If the meshing position of the first movable knife and the second movable knife is not positioned under the pin plate hole due to part machining errors, assembly errors, looseness and other mechanical errors caused by long-time use, the change of the meshing position can be realized by adjusting the angle of the eccentric pin.
Compared with the prior art, the thread trimming mechanism of the sewing machine has the following advantages:
the shortest thread end remained on the cloth after thread trimming is greatly shortened, and the thread trimming quality is improved; and the structure is very succinct, can realize the fine setting of the meshing position of first movable sword and second movable sword blade, only need rotate during the regulation eccentric pin can, it is convenient to adjust, does not receive part machining error to influence, guarantees that the trimming position is in under the needle plat all the time.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is an exploded view of the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the thread trimming mechanism provided by the invention when the thread is not trimmed.
Fig. 4 is a schematic structural diagram of the thread trimming mechanism provided by the invention during thread trimming.
Fig. 5 is a schematic diagram of a thread trimming mechanism provided by the present invention.
Fig. 6 is a schematic structural view of the eccentric pin provided by the present invention.
In the figure, 1, a bottom plate; 2. a first rotating shaft; 3. a second rotating shaft; 4. a main tool rest; 5. auxiliary tool rests; 6. a first movable knife; 7. a second movable knife; 8. swinging arms; 9. a first connecting rod; 10. a second connecting rod; 11. an eccentric pin; 12. a first eccentric part; 13. a second eccentric part; 14. a first through hole; 15. a second through hole; 16. a locking hole; 17. a threaded hole; 18. locking the screw; 19. a third through hole; 20. a fifth through hole; 21. and (7) pressing a plate.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example one
The thread trimming mechanism of the sewing machine shown in fig. 1 and 2 comprises a first rotating shaft 2 fixed on a base plate 1 and a second rotating shaft 3 arranged in parallel with the first rotating shaft 2, wherein a first main cutter frame 4 and a second auxiliary cutter frame 5 capable of rotating around the first rotating shaft 2 are sleeved on the first rotating shaft 2, a first movable cutter 6 is arranged on the first main cutter frame 4, a second movable cutter 7 is arranged on the second auxiliary cutter frame 5, and a swing arm 8 is fixedly connected to the second rotating shaft 3. As shown in fig. 1, a first connecting rod 9 is hinged on the main knife rest 4, a second connecting rod 10 is hinged on the auxiliary knife rest 5, the free end of the first connecting rod 9, the free end of the second connecting rod 10 and the free end of the swing arm 8 are hinged together through the same hinge shaft, and an adjusting structure for adjusting the meshing position of the first movable knife 6 and the second movable knife 7 is arranged between the main knife rest 4 and the auxiliary knife rest 5.
In this embodiment, the hinge shaft is an eccentric pin 11, as shown in fig. 6, the adjusting structure includes a first eccentric portion 12 and a second eccentric portion 13 located on the eccentric pin 11, as shown in fig. 2, a first through hole 14 is formed in the free end of a first connecting rod 9, a second through hole 15 is formed in the free end of a second connecting rod 10, the first eccentric portion 12 is disposed in the first through hole 14 in a matching manner, the second eccentric portion 13 is disposed in the second through hole 15 in a matching manner, and the eccentric pin 11 is fixed on the swing arm 8 through a detachable component.
As shown in fig. 2, the detachable assembly comprises a locking hole 16 arranged at the free end of the swing arm 8, a threaded hole 17 arranged on the side wall of the swing arm 8 and communicated with the locking hole 16 at the inner end thereof, and a locking screw 18 in threaded connection with the threaded hole 17, the eccentric pin 11 is arranged in the locking hole 16 in a penetrating manner, and the inner end of the locking screw 18 is abutted against the side wall of the eccentric pin 11.
As shown in fig. 1, a tool holder pressing plate 21 is arranged at one end of the rotating shaft one 2, which is far away from the bottom plate 1, and the pressing plate 21 is used for limiting the axial positions of the main tool holder 4 and the auxiliary tool holder 5 and preventing the axial movement of the main tool holder 4 and the auxiliary tool holder 5. The main tool rest 4 and the auxiliary tool rest 5 are arranged in a stacked mode along the axial direction of the first rotating shaft 2. In order to enable the first movable knife 6 and the second movable knife 7 to be better engaged, the first movable knife 6 is arranged to be in a circular arc shape, the center of the circular arc is located on the central axis of the first rotating shaft 2, and the second movable knife 7 is arranged to be in a circular arc shape, and the center of the circular arc is located on the central axis of the first rotating shaft 2.
In the initial state, as shown in fig. 3, the cutting edge of the first movable blade 6 and the cutting edge of the second movable blade 7 are kept at a safe distance from the needle board hole. When needing the trimming, automatic control unit drive pivot two 3 clockwise rotations, drive main knife rest 4 and auxiliary knife rest 5 through connecting rod one 9 and connecting rod two 10 and rotate, as shown in fig. 4, when the blade of activity sword one 6 and activity sword two 7 meshes mutually, accomplish the trimming action, the meshing position of activity sword one 6 and activity sword two 7 blades is located under the pinhole, and then the maximize has shortened the distance in trimming position and pinhole, makes the end of a thread that remains on the cloth shortest. If the meshing position of the cutting edges of the first movable knife 6 and the second movable knife 7 is not positioned under the pin plate hole due to part machining errors, assembly errors, looseness and other mechanical errors caused by long-time use, the change of the meshing position can be realized by adjusting the angle of the eccentric pin 11.
Example two
The structure principle of this embodiment is basically the same as that of the first embodiment, except that the adjusting structure comprises an eccentric pin 11 with a first eccentric part 12 and a second eccentric part 13, the eccentric pin 11 is parallel to the first rotating shaft 2, as shown in fig. 2, one end of the first connecting rod 9 close to the main tool rest 4 is provided with a third through hole 19, the main tool rest 4 is provided with a fourth through hole, the first eccentric part 12 is arranged in the third through hole 19 in a matching manner, the second eccentric part 13 is arranged in the fourth through hole in a matching manner, and the eccentric pin 11 is fixed on the main tool rest 4 through a first detachable component.
Specifically, the detachable assembly I comprises a first threaded hole and a first locking screw, wherein the first threaded hole is formed in the main tool rest 4, the inner end of the first threaded hole is communicated with the through hole, the first locking screw is in threaded connection with the first threaded hole, and the inner end of the first locking screw abuts against the second eccentric part 13.
As shown in fig. 5, the eccentric pin 11 is located at point C, the position of B, D is fixed during adjustment, and the angle of the eccentric pin 11 is adjusted to change the relative rod length between BC and CD, thereby changing the angle of the main blade holder 4 to adjust the shear line position.
EXAMPLE III
The structure principle of this embodiment is basically the same as that of the first embodiment, and the difference lies in that the adjusting structure includes an eccentric pin 11 having a first eccentric part 12 and a second eccentric part 13 thereon, the eccentric pin 11 is parallel to the first rotating shaft 2, as shown in fig. 2, one end of a second connecting rod 10 close to the auxiliary knife rest 5 has a fifth through hole 20, the auxiliary knife rest 5 has a sixth through hole, the first eccentric part 12 is disposed in the fifth through hole 20 in a matching manner, the second eccentric part 13 is disposed in the sixth through hole in a matching manner, and the eccentric pin 11 is fixed on the auxiliary knife rest 5 through a detachable component two.
Specifically, the detachable assembly II comprises a threaded hole II and a locking screw II, wherein the threaded hole II is formed in the auxiliary tool rest 5, the inner end of the threaded hole II is communicated with the through hole six, the locking screw II is in threaded connection with the threaded hole II, and the inner end of the locking screw II abuts against the eccentric part II 13.
As shown in FIG. 5, the eccentric pin 11 is located at the point C, the point B, D is fixed during adjustment, and the angle of the auxiliary tool rest 5 is changed by adjusting the angle of the eccentric pin 11 to further change the relative rod length of BE and ED so as to adjust the line shearing position.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. A thread trimming mechanism of a sewing machine comprises a first rotating shaft (2) fixed on a bottom plate (1) and a second rotating shaft (3) arranged in parallel with the first rotating shaft (2), wherein a first main cutter frame (4) and a second auxiliary cutter frame (5) which can rotate around the first rotating shaft (2) are sleeved on the first rotating shaft (2), a first movable cutter (6) is arranged on the first main cutter frame (4), a second movable cutter (7) is arranged on the second auxiliary cutter frame (5), and a swing arm (8) is fixedly connected to the second rotating shaft (3), the thread trimming mechanism is characterized in that a first connecting rod (9) is hinged to the first main cutter frame (4), a second connecting rod (10) is hinged to the second auxiliary cutter frame (5), the free end of the first connecting rod (9), the free end of the second connecting rod (10) and the free end of the swing arm (8) are hinged together through the same hinge shaft, and an adjusting structure for adjusting the meshing positions of the first movable cutter (6) and the second movable cutter (7) is arranged between the first main cutter frame (4) and the second auxiliary cutter frame (5);
the hinge shaft is an eccentric pin (11), the adjusting structure comprises a first eccentric part (12) and a second eccentric part (13) which are positioned on the eccentric pin (11), a first through hole (14) is formed in the free end of the first connecting rod (9), a second through hole (15) is formed in the free end of the second connecting rod (10), the first eccentric part (12) is arranged in the first through hole (14) in a matching mode, the second eccentric part (13) is arranged in the second through hole (15) in a matching mode, and the eccentric pin (11) is fixed on the swing arm (8) through a detachable component;
the detachable assembly comprises a locking hole (16) arranged at the free end of the swing arm (8), a threaded hole (17) arranged at the side wall of the swing arm (8) and communicated with the locking hole (16) at the inner end of the side wall of the swing arm, and a locking screw (18) in threaded connection with the threaded hole (17), the eccentric pin (11) is arranged in the locking hole (16) in a penetrating way, and the inner end of the locking screw (18) is abutted against the side wall of the eccentric pin (11);
and a tool rest pressing plate (21) is arranged at one end of the first rotating shaft (2) far away from the bottom plate (1).
2. The thread trimming mechanism of a sewing machine according to claim 1, wherein the adjusting structure includes an eccentric pin (11) having a first eccentric portion (12) and a second eccentric portion (13), the eccentric pin (11) is parallel to the first rotating shaft (2), one end of the first connecting rod (9) close to the main blade carrier (4) has a third through hole (19), the main blade carrier (4) has a fourth through hole, the first eccentric portion (12) is fitted in the third through hole (19), the second eccentric portion (13) is fitted in the fourth through hole, and the eccentric pin (11) is fixed on the main blade carrier (4) through the first detachable component.
3. The thread trimming mechanism for sewing machine according to claim 2, wherein the first detachable assembly includes a first threaded hole provided in the main blade holder (4) and having an inner end communicating with the fourth through hole, and a first locking screw threadedly engaged in the first threaded hole, the inner end of the first locking screw abutting against the second eccentric portion (13).
4. The thread trimming mechanism of a sewing machine according to claim 1, wherein the adjusting structure includes an eccentric pin (11) having a first eccentric portion (12) and a second eccentric portion (13), the eccentric pin (11) is parallel to the first rotating shaft (2), one end of the second connecting rod (10) near the auxiliary knife rest (5) has a fifth through hole (20), the auxiliary knife rest (5) has a sixth through hole, the first eccentric portion (12) is disposed in the fifth through hole (20) in a matching manner, the second eccentric portion (13) is disposed in the sixth through hole in a matching manner, and the eccentric pin (11) is fixed on the auxiliary knife rest (5) through a second detachable component.
5. The thread trimming mechanism of a sewing machine according to claim 4, wherein the detachable assembly II comprises a second threaded hole and a second locking screw, wherein the second threaded hole is formed in the auxiliary tool rest (5), the inner end of the second threaded hole is communicated with the sixth through hole, the second locking screw is in threaded connection with the second threaded hole, and the inner end of the second locking screw abuts against the second eccentric part (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686107.XA CN107268202B (en) | 2017-08-11 | 2017-08-11 | Thread cutting mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686107.XA CN107268202B (en) | 2017-08-11 | 2017-08-11 | Thread cutting mechanism of sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107268202A CN107268202A (en) | 2017-10-20 |
| CN107268202B true CN107268202B (en) | 2022-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710686107.XA Active CN107268202B (en) | 2017-08-11 | 2017-08-11 | Thread cutting mechanism of sewing machine |
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| Country | Link |
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| CN (1) | CN107268202B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457015B (en) * | 2018-06-28 | 2024-01-30 | 本佳安凯（湖南）缝制机械有限公司 | Automatic sewing machine cuts line mechanism and sewing machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3142396U (en) * | 2008-03-31 | 2008-06-12 | 啓翔股▲ふん▼有限公司 | Sewing machine cutting equipment |
| CN205205442U (en) * | 2015-10-15 | 2016-05-04 | 浙江上工宝石缝纫科技有限公司 | Sewing machine's thread trimming mechanism |
| CN105970507B (en) * | 2016-06-24 | 2019-01-25 | 杰克缝纫机股份有限公司 | The thread cutting mechanism of sewing machine |
| CN206279337U (en) * | 2016-12-02 | 2017-06-27 | 浙江宝宇缝纫机有限公司 | A kind of thread cutting mechanism of sewing machine |
| CN206448033U (en) * | 2016-12-09 | 2017-08-29 | 杰克缝纫机股份有限公司 | Thread cutting mechanism of sewing machine |
| CN106894175B (en) * | 2017-04-01 | 2020-01-31 | 杰克缝纫机股份有限公司 | automatic thread trimming mechanism of sewing machine and sewing machine |
| CN207091682U (en) * | 2017-08-11 | 2018-03-13 | 杰克缝纫机股份有限公司 | The thread cutting mechanism of sewing machine |
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2017
- 2017-08-11 CN CN201710686107.XA patent/CN107268202B/en active Active
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Address after: 318014 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Applicant after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Applicant before: JACK SEWING MACHINE Co.,Ltd. |
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