CN111748924A - Thread trimming mechanism and sewing machine with same - Google Patents
Thread trimming mechanism and sewing machine with same Download PDFInfo
- Publication number
- CN111748924A CN111748924A CN201910251912.9A CN201910251912A CN111748924A CN 111748924 A CN111748924 A CN 111748924A CN 201910251912 A CN201910251912 A CN 201910251912A CN 111748924 A CN111748924 A CN 111748924A
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- cutter
- crank
- driving crank
- driving
- thread trimming
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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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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread cutting mechanism and a sewing machine with the same, wherein the thread cutting mechanism is used for cutting sewing threads on a needle of the sewing machine, and comprises: the first driving crank is in driving connection with the first cutter so as to drive the first cutter to move; the second driving crank is in driving connection with the second cutter so as to drive the second cutter to move; the connecting crank is in driving connection with the first driving crank and the second driving crank, so that the connecting crank drives the first driving crank and the second driving crank to move relatively, the first cutter and the second cutter are relatively close to conduct a tangent line action, and the problem that the sewing machine in the prior art is low in working efficiency is solved.
Description
Technical Field
The invention relates to the field of sewing machines, in particular to a thread trimming mechanism and a sewing machine with the same.
Background
At present, the thread cutting mode of the sewing machine in the market adopts electromagnet suction and cam work to realize the work of a single thread cutting crank, and the crank drives a movable cutter to move towards a fixed cutter so as to realize the thread cutting work.
However, in the conventional thread cutting mechanism, the fixed knife needs to be fixed on the body of the sewing machine, so that thread cutting action at any position cannot be realized, and the working efficiency of the sewing machine is reduced.
Disclosure of Invention
The invention mainly aims to provide a thread trimming mechanism and a sewing machine with the same, and aims to solve the problem that the sewing machine in the prior art is low in working efficiency.
In order to achieve the above object, according to one aspect of the present invention, there is provided a thread cutting mechanism for cutting a sewing thread on a needle of a sewing machine, the thread cutting mechanism comprising: the first driving crank is in driving connection with the first cutter so as to drive the first cutter to move; the second driving crank is in driving connection with the second cutter so as to drive the second cutter to move; the connecting crank is in driving connection with the first driving crank and the second driving crank, so that the first driving crank and the second driving crank are driven to move relatively through the connecting crank, and the first cutter and the second cutter are relatively close to each other to perform a tangent action.
Further, the connecting crank comprises: the first connecting part is connected with the second driving crank so as to drive the second driving crank to rotate; the second connecting part is connected with the first driving crank so as to drive the first driving crank to rotate; first connecting portion are articulated with the second connecting portion to drive first drive crank and second drive crank and be close to relatively or keep away from relatively, when first drive crank and second drive crank kept away from relatively, first cutter and second cutter are close to each other and are realized tangent line action.
Further, the first connecting part is connected with the second connecting part through the connecting assembly; the coupling assembling includes: the rotating screw is at least partially arranged on the first connecting part in a penetrating way; the connecting block, the connecting block setting is on rotatory screw, and at least part and the connecting block joint of second connecting portion to make first connecting portion drive the motion of second connecting portion.
Furthermore, an opening portion is arranged at one end, close to the first connecting portion, of the second connecting portion, and at least part of the connecting block is clamped in the opening portion.
Further, the thread trimming mechanism further comprises: the first cutter assembly is arranged on the first cutter frame, and the first driving crank is in driving connection with the first cutter through the first cutter assembly so as to enable the first driving crank to drive the first cutter to move towards the direction far away from or close to the second cutter through the first cutter assembly; and the second driving crank is in driving connection with the second cutter through the second cutter rest assembly, so that the second driving crank drives the second cutter to move towards the direction far away from or close to the first cutter through the second cutter rest assembly.
Further, the first carriage assembly includes: the rod body of the first connecting rod is arc-shaped, and one end of the first connecting rod is in transmission connection with the first cutter; the other end of the first connecting rod is hinged with one end of the first transition rod, and the other end of the first transition rod is fixedly connected with the first driving crank; when the wire shearing action is carried out, the first driving crank drives the first connecting rod to move along a first preset direction through the first transition rod, so that the first cutter moves towards the second cutter.
Further, the second carriage assembly comprises: the rod body of the second connecting rod is arc-shaped, and one end of the second connecting rod is in transmission connection with the second cutter; the other end of the second connecting rod is hinged with one end of the second transition rod, and the other end of the second transition rod is fixedly connected with the second driving crank; when the thread cutting action is carried out, the second driving crank drives the second connecting rod to move along a second preset direction through the second transition rod, so that the second cutter moves towards the first cutter.
Further, the first predetermined direction and the second predetermined direction are directions in which the first cutter and the second cutter approach each other.
Further, the thread trimming mechanism further comprises: the first cutter and the second cutter rotate around the axis of the main shaft to be close to or far away from each other, and a trimming cam is mounted on the main shaft; and at least part of the driving component is opposite to the thread trimming cam and pushes the thread trimming cam to move towards the connecting crank to push the connecting crank to rotate around a preset axis when the thread trimming action is carried out.
According to another aspect of the present invention, there is provided a sewing machine comprising a thread cutting mechanism, wherein the thread cutting mechanism is the thread cutting mechanism described above.
By applying the technical scheme, the thread cutting mechanism comprises a first driving crank, a second driving crank and a connecting crank, wherein the first driving crank is in driving connection with a first cutter to drive the first cutter to move, the second driving crank is in driving connection with a second cutter to drive the second cutter to move, the connecting crank is in driving connection with the first driving crank and the second driving crank, so that the first driving crank and the second driving crank are driven to move relatively through the connecting crank, the first cutter and the second cutter are relatively close to each other to perform thread cutting, the first driving crank and the second driving crank are arranged to respectively drive the first cutter and the second cutter, the thread cutting positions of the first cutter and the second cutter can be independently adjusted, a large amount of time is saved, and the working efficiency of the sewing machine is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram illustrating a first perspective of a thread trimming mechanism according to the present invention;
FIG. 2 is a schematic diagram illustrating a second perspective of the thread trimming mechanism according to the present invention; and
fig. 3 shows a third perspective of the thread trimming mechanism according to the invention.
Wherein the figures include the following reference numerals:
10. a needle; 20. a first drive crank; 21. a first cutter; 30. a second drive crank; 31. a second cutter; 40. a connecting crank; 41. a first connection portion; 42. a second connecting portion; 43. a connecting assembly; 430. connecting blocks; 431. rotating the screw; 60. a second carriage assembly; 61. a second cutter holder; 62. a second link; 63. a second transition bar; 70. a first carriage assembly; 71. a first cutter holder; 72. a first link; 73. a first transition bar; 50. a main shaft; 51. a trimming cam; 80. a drive member; 81. an iron core; 82. a first connecting plate; 83. a second connecting plate; 84. and a roller.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present invention provides a thread cutting mechanism, please refer to fig. 1 to 3, for cutting a sewing thread on a needle 10 of a sewing machine, the thread cutting mechanism comprises: the first driving crank 20 is in driving connection with the first cutter 21 so as to drive the first cutter 21 to move; the second driving crank 30, the second driving crank 30 is connected with the second cutter 31 in a driving way to drive the second cutter 31 to move; the connecting crank 40 is in driving connection with both the first driving crank 20 and the second driving crank 30, so that the connecting crank 40 drives the first driving crank 20 and the second driving crank 30 to move relatively, and the first cutter 21 and the second cutter 31 are relatively close to each other to perform a cutting action.
The thread trimming mechanism provided by the invention comprises a first driving crank 20, a second driving crank 30 and a connecting crank 40, wherein the first driving crank 20 is in driving connection with a first cutter 21 to drive the first cutter 21 to move, the second driving crank 30 is in driving connection with a second cutter 31 to drive the second cutter 31 to move, the connecting crank 40 is in driving connection with the first driving crank 20 and the second driving crank 30, so as to drive the first driving crank 20 and the second driving crank 30 to move relatively through the connecting crank 40, so that the first cutting knife 21 and the second cutting knife 31 are relatively close to each other to perform a cutting action, through setting up first drive crank 20 and second drive crank 30, realize driving respectively first cutter 21 and second cutter 31, can adjust the trimming position of first cutter 21 and second cutter 31 alone, saved a large amount of time, improved sewing machine's work efficiency.
In particular implementation, the connecting crank 40 comprises: the first connecting part 41, the first connecting part 41 is connected with the second driving crank 30 to drive the second driving crank 30 to rotate; the second connecting part 42 is connected with the first driving crank 20 so as to drive the first driving crank 20 to rotate; the first connecting portion 41 is hinged to the second connecting portion 42 to drive the first driving crank 20 and the second driving crank 30 to approach or separate from each other relatively, when the first driving crank 20 and the second driving crank 30 are separated from each other relatively, the first cutter 21 and the second cutter 31 approach each other to realize a tangent line action, here, because the first cutter 21 and the second cutter 31 are respectively sleeved on the main shaft 50, in order to increase the movement formation of the first cutter 21 and the second cutter 31, when the tangent line action is performed, the first cutter 21 and the second cutter 31 respectively move around the axis of the main shaft 50, therefore, when the first driving crank 20 and the second driving crank 30 are separated from each other relatively, the first cutter 21 and the second cutter 31 are driven to approach each other.
Specifically, the first connection portion 41 is connected to the second connection portion 42 by the connection assembly 43; the connection assembly 43 includes: a rotating screw 431, at least a part of the rotating screw 431 is arranged on the first connecting part 41 in a penetrating way; the connecting block 430 is arranged on the rotating screw 431, at least part of the second connecting portion 42 is clamped with the connecting block 430, so that the first connecting portion 41 drives the second connecting portion 42 to move, when the driving member drives one end of the first connecting portion 41 to move towards the direction far away from the second connecting portion 42, the other end of the first connecting portion 41 rotates around the axis of the rotating screw 431, and the connecting block 430 drives one end of the second connecting portion 42 far away from the connecting block 430 to move towards the direction far away from the first connecting portion 41.
In order to facilitate the driving connection between the first connection portion 41 and the second connection portion 42, an opening portion is disposed at one end of the second connection portion 42 close to the first connection portion 41, and at least a portion of the connection block 430 is engaged in the opening portion.
In an embodiment provided by the present invention, the thread trimming mechanism further includes: the first cutter assembly 70, the first driving crank 20 is in driving connection with the first cutter 21 through the first cutter assembly 70, so that the first driving crank 20 drives the first cutter 21 to move towards the direction far away from or close to the second cutter 31 through the first cutter assembly 70; the second knife rest assembly 60 and the second driving crank 30 are in driving connection with the second cutter 31 through the second knife rest assembly 60, so that the second driving crank 30 drives the second cutter 31 to move towards the direction far away from or close to the first cutter 21 through the second knife rest assembly 60, the thread trimming mechanism reasonably occupies the installation space, and the movement stroke of the first cutter 21 and the second cutter 31 is increased.
Specifically, in order to increase the movement stroke of the first cutter 21 and the second cutter 31, the first cutter assembly 70 includes a first connecting rod 72, a rod body of the first connecting rod 72 is arc-shaped, one end of the first connecting rod 72 is in transmission connection with the first cutter 21, the first cutter 21 is installed on a first cutter seat 71, the first cutter seat 71 is sleeved on the spindle 50, one end of the first connecting rod 72 is connected with the first cutter seat 71, and the first connecting rod 72 is arranged opposite to the first cutter 21 so as to increase the movement stroke of the first cutter 21; the other end of the first connecting rod 72 is hinged with one end of the first transition rod 73, and the other end of the first transition rod 73 is fixedly connected with the first driving crank 20; when the thread cutting action is performed, the first driving crank 20 drives the first connecting rod 72 to move along the first predetermined direction through the first transition rod 73, so that the first cutter 21 moves towards the second cutter 31.
The second carriage assembly 60 includes: a second connecting rod 62, wherein the rod body of the second connecting rod 62 is arc-shaped, one end of the second connecting rod 62 is in transmission connection with the second cutter 31, the second cutter 31 is installed on the second cutter seat 61, the second cutter seat 61 is sleeved on the main shaft 50, one end of the second connecting rod 62 is connected with the second cutter seat 61, and the second connecting rod 62 and the second cutter 31 are oppositely arranged to increase the movement stroke of the second cutter 31; the other end of the second connecting rod 62 is hinged with one end of the second transition rod 63, and the other end of the second transition rod 63 is fixedly connected with the second driving crank 30; when the thread cutting action is performed, the second driving crank 30 drives the second connecting rod 62 to move along the second predetermined direction through the second transition rod 63, so that the second cutter 31 moves towards the first cutter 21.
The first predetermined direction and the second predetermined direction are directions in which the first cutter 21 and the second cutter 31 approach each other.
Specifically, the thread trimming mechanism further includes: the cutting device comprises a main shaft 50, wherein a first cutter 21 and a second cutter 31 are both arranged on the main shaft 50, the first cutter 21 and the second cutter 31 rotate around the axis of the main shaft 50 to be close to or far away from each other, and a trimming cam 51 is arranged on the main shaft 50; and the driving component 80, at least part of the driving component 80 is opposite to the thread trimming cam 51, and when the thread trimming action is carried out, at least part of the driving component 80 pushes the thread trimming cam 51 to move towards the direction of the connecting crank 40 so as to push the connecting crank 40 to rotate around a preset axis.
In particular implementation, the driving member 80 is preferably an electromagnet assembly, and includes an iron core 81, a first connecting plate 82, a second connecting plate 83, and a roller 84; wherein, at least part of the iron core 81 is opposite to the first connecting plate 82, the first connecting plate 82 is hinged with one end of the second connecting plate 83, and the other end of the second connecting plate 83 is connected with the roller 84 through a connecting rod; when the trimming action is performed, the electromagnet assembly is powered on, the iron core 81 moves towards the first connecting plate 82 to abut against the first connecting plate 82 so as to push the first connecting plate 82 to move, so that the first connecting plate 82 drives the second connecting plate 83 to move towards the direction close to the trimming cam 51, and the second connecting plate 83 drives the roller 84 to move towards the direction close to the trimming cam 51 through the connecting rod to abut against the trimming cam 51 so as to push the trimming cam 51 to move.
Further, a reset torsion spring is sleeved on the second driving crank 30 to realize the automatic reset of the first cutter 21 and the second cutter 31 after the thread cutting is finished.
The invention also provides a sewing machine which comprises the thread cutting mechanism.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the thread cutting mechanism comprises a first driving crank 20, a second driving crank 30 and a connecting crank 40, wherein the first driving crank 20 is in driving connection with a first cutter 21 to drive the first cutter 21 to move, the second driving crank 30 is in driving connection with a second cutter 31 to drive the second cutter 31 to move, the connecting crank 40 is in driving connection with the first driving crank 20 and the second driving crank 30 to drive the first driving crank 20 and the second driving crank 30 to move relatively through the connecting crank 40, so that the first cutter 21 and the second cutter 31 are relatively close to each other to perform thread cutting, the first driving crank 20 and the second driving crank 30 are arranged to drive the first cutter 21 and the second cutter 31 respectively, the thread cutting positions of the first cutter 21 and the second cutter 31 can be adjusted independently, a large amount of time is saved, and the working efficiency of the sewing machine is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A thread trimming mechanism for trimming sewing thread on a needle (10) of a sewing machine, the thread trimming mechanism comprising:
the first driving crank (20), the first driving crank (20) is in driving connection with the first cutter (21) to drive the first cutter (21) to move;
the second driving crank (30), the second driving crank (30) is in driving connection with the second cutter (31) to drive the second cutter (31) to move;
the connecting crank (40) is in driving connection with the first driving crank (20) and the second driving crank (30), so that the first driving crank (20) and the second driving crank (30) are driven to move relatively through the connecting crank (40), and the first cutter (21) and the second cutter (31) are relatively close to each other to perform a cutting action.
2. The thread trimming mechanism according to claim 1, wherein the connecting crank (40) comprises:
the first connecting part (41) is connected with the second driving crank (30) so as to drive the second driving crank (30) to rotate;
the second connecting part (42) is connected with the first driving crank (20) so as to drive the first driving crank (20) to rotate;
the first connecting portion (41) is hinged to the second connecting portion (42) to drive the first driving crank (20) and the second driving crank (30) to be relatively close to or relatively far away from each other, and when the first driving crank (20) and the second driving crank (30) are relatively far away from each other, the first cutter (21) and the second cutter (31) are mutually close to each other to achieve a cutting action.
3. The thread trimming mechanism according to claim 2, wherein the first connecting portion (41) is connected to the second connecting portion (42) by a connecting assembly (43); the connection assembly (43) comprises:
a rotating screw (431), at least part of the rotating screw (431) is arranged on the first connecting part (41) in a penetrating way;
the connecting block (430) is arranged on the rotating screw (431), and at least part of the second connecting part (42) is clamped with the connecting block (430), so that the first connecting part (41) drives the second connecting part (42) to move.
4. The thread trimming mechanism according to claim 3, wherein an opening is provided at an end of the second connecting portion (42) adjacent to the first connecting portion (41), and at least a portion of the connecting block (430) is engaged in the opening.
5. The thread trimming mechanism of claim 2, further comprising:
the first cutter frame assembly (70) is used for driving the first driving crank (20) to be connected with the first cutter (21) through the first cutter frame assembly (70), so that the first driving crank (20) drives the first cutter (21) to move towards the direction far away from or close to the second cutter (31) through the first cutter frame assembly (70);
the second tool rest assembly (60) is used for driving the second driving crank (30) to be connected with the second cutting knife (31) through the second tool rest assembly (60), so that the second driving crank (30) drives the second cutting knife (31) to move towards the direction far away from or close to the first cutting knife (21) through the second tool rest assembly (60).
6. The wire cutting mechanism of claim 5, wherein the first carriage assembly (70) comprises:
the rod body of the first connecting rod (72) is arc-shaped, and one end of the first connecting rod (72) is in transmission connection with the first cutter (21);
the other end of the first connecting rod (72) is hinged to one end of the first transition rod (73), and the other end of the first transition rod (73) is fixedly connected with the first driving crank (20);
when the thread cutting action is carried out, the first driving crank (20) drives the first connecting rod (72) to move along a first preset direction through the first transition rod (73), so that the first cutter (21) moves towards the second cutter (31).
7. The thread trimming mechanism according to claim 6, wherein the second carriage assembly (60) comprises:
the rod body of the second connecting rod (62) is arc-shaped, and one end of the second connecting rod (62) is in transmission connection with the second cutter (31);
the other end of the second connecting rod (62) is hinged to one end of the second transition rod (63), and the other end of the second transition rod (63) is fixedly connected with the second driving crank (30);
when the thread cutting action is carried out, the second driving crank (30) drives the second connecting rod (62) to move along a second preset direction through the second transition rod (63), so that the second cutter (31) moves towards the first cutter (21).
8. The thread trimming mechanism according to claim 7, wherein the first predetermined direction and the second predetermined direction are directions in which the first cutter (21) and the second cutter (31) approach each other.
9. The thread trimming mechanism of claim 1, further comprising:
the first cutter (21) and the second cutter (31) are mounted on the main shaft (50), the first cutter (21) and the second cutter (31) rotate around the axis of the main shaft (50) to be close to or far away from each other, and a trimming cam (51) is mounted on the main shaft (50);
a drive member (80), at least part of the drive member (80) is opposite to the thread trimming cam (51), and when the thread trimming action is carried out, at least part of the drive member (80) pushes the thread trimming cam (51) to move towards the connecting crank (40) so as to push the connecting crank (40) to rotate around a preset axis.
10. A sewing machine including a thread trimming mechanism, wherein the thread trimming mechanism is as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910251912.9A CN111748924A (en) | 2019-03-29 | 2019-03-29 | Thread trimming mechanism and sewing machine with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910251912.9A CN111748924A (en) | 2019-03-29 | 2019-03-29 | Thread trimming mechanism and sewing machine with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111748924A true CN111748924A (en) | 2020-10-09 |
Family
ID=72672499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910251912.9A Pending CN111748924A (en) | 2019-03-29 | 2019-03-29 | Thread trimming mechanism and sewing machine with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111748924A (en) |
-
2019
- 2019-03-29 CN CN201910251912.9A patent/CN111748924A/en active Pending
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